KVM: VMX: Fix kvm_set_shared_msr() called in preemptible context
[linux-3.10.git] / arch / x86 / kvm / vmx.c
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * This module enables machines with Intel VT-x extensions to run virtual
5  * machines without emulation or binary translation.
6  *
7  * Copyright (C) 2006 Qumranet, Inc.
8  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
9  *
10  * Authors:
11  *   Avi Kivity   <avi@qumranet.com>
12  *   Yaniv Kamay  <yaniv@qumranet.com>
13  *
14  * This work is licensed under the terms of the GNU GPL, version 2.  See
15  * the COPYING file in the top-level directory.
16  *
17  */
18
19 #include "irq.h"
20 #include "mmu.h"
21 #include "cpuid.h"
22
23 #include <linux/kvm_host.h>
24 #include <linux/module.h>
25 #include <linux/kernel.h>
26 #include <linux/mm.h>
27 #include <linux/highmem.h>
28 #include <linux/sched.h>
29 #include <linux/moduleparam.h>
30 #include <linux/ftrace_event.h>
31 #include <linux/slab.h>
32 #include <linux/tboot.h>
33 #include "kvm_cache_regs.h"
34 #include "x86.h"
35
36 #include <asm/io.h>
37 #include <asm/desc.h>
38 #include <asm/vmx.h>
39 #include <asm/virtext.h>
40 #include <asm/mce.h>
41 #include <asm/i387.h>
42 #include <asm/xcr.h>
43 #include <asm/perf_event.h>
44
45 #include "trace.h"
46
47 #define __ex(x) __kvm_handle_fault_on_reboot(x)
48 #define __ex_clear(x, reg) \
49         ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg)
50
51 MODULE_AUTHOR("Qumranet");
52 MODULE_LICENSE("GPL");
53
54 static bool __read_mostly enable_vpid = 1;
55 module_param_named(vpid, enable_vpid, bool, 0444);
56
57 static bool __read_mostly flexpriority_enabled = 1;
58 module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
59
60 static bool __read_mostly enable_ept = 1;
61 module_param_named(ept, enable_ept, bool, S_IRUGO);
62
63 static bool __read_mostly enable_unrestricted_guest = 1;
64 module_param_named(unrestricted_guest,
65                         enable_unrestricted_guest, bool, S_IRUGO);
66
67 static bool __read_mostly emulate_invalid_guest_state = 0;
68 module_param(emulate_invalid_guest_state, bool, S_IRUGO);
69
70 static bool __read_mostly vmm_exclusive = 1;
71 module_param(vmm_exclusive, bool, S_IRUGO);
72
73 static bool __read_mostly fasteoi = 1;
74 module_param(fasteoi, bool, S_IRUGO);
75
76 /*
77  * If nested=1, nested virtualization is supported, i.e., guests may use
78  * VMX and be a hypervisor for its own guests. If nested=0, guests may not
79  * use VMX instructions.
80  */
81 static bool __read_mostly nested = 0;
82 module_param(nested, bool, S_IRUGO);
83
84 #define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST                           \
85         (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
86 #define KVM_GUEST_CR0_MASK                                              \
87         (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
88 #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST                         \
89         (X86_CR0_WP | X86_CR0_NE)
90 #define KVM_VM_CR0_ALWAYS_ON                                            \
91         (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
92 #define KVM_CR4_GUEST_OWNED_BITS                                      \
93         (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR      \
94          | X86_CR4_OSXMMEXCPT)
95
96 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
97 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
98
99 #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM))
100
101 /*
102  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
103  * ple_gap:    upper bound on the amount of time between two successive
104  *             executions of PAUSE in a loop. Also indicate if ple enabled.
105  *             According to test, this time is usually smaller than 128 cycles.
106  * ple_window: upper bound on the amount of time a guest is allowed to execute
107  *             in a PAUSE loop. Tests indicate that most spinlocks are held for
108  *             less than 2^12 cycles
109  * Time is measured based on a counter that runs at the same rate as the TSC,
110  * refer SDM volume 3b section 21.6.13 & 22.1.3.
111  */
112 #define KVM_VMX_DEFAULT_PLE_GAP    128
113 #define KVM_VMX_DEFAULT_PLE_WINDOW 4096
114 static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
115 module_param(ple_gap, int, S_IRUGO);
116
117 static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
118 module_param(ple_window, int, S_IRUGO);
119
120 #define NR_AUTOLOAD_MSRS 8
121 #define VMCS02_POOL_SIZE 1
122
123 struct vmcs {
124         u32 revision_id;
125         u32 abort;
126         char data[0];
127 };
128
129 /*
130  * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also
131  * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs
132  * loaded on this CPU (so we can clear them if the CPU goes down).
133  */
134 struct loaded_vmcs {
135         struct vmcs *vmcs;
136         int cpu;
137         int launched;
138         struct list_head loaded_vmcss_on_cpu_link;
139 };
140
141 struct shared_msr_entry {
142         unsigned index;
143         u64 data;
144         u64 mask;
145 };
146
147 /*
148  * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a
149  * single nested guest (L2), hence the name vmcs12. Any VMX implementation has
150  * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is
151  * stored in guest memory specified by VMPTRLD, but is opaque to the guest,
152  * which must access it using VMREAD/VMWRITE/VMCLEAR instructions.
153  * More than one of these structures may exist, if L1 runs multiple L2 guests.
154  * nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the
155  * underlying hardware which will be used to run L2.
156  * This structure is packed to ensure that its layout is identical across
157  * machines (necessary for live migration).
158  * If there are changes in this struct, VMCS12_REVISION must be changed.
159  */
160 typedef u64 natural_width;
161 struct __packed vmcs12 {
162         /* According to the Intel spec, a VMCS region must start with the
163          * following two fields. Then follow implementation-specific data.
164          */
165         u32 revision_id;
166         u32 abort;
167
168         u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
169         u32 padding[7]; /* room for future expansion */
170
171         u64 io_bitmap_a;
172         u64 io_bitmap_b;
173         u64 msr_bitmap;
174         u64 vm_exit_msr_store_addr;
175         u64 vm_exit_msr_load_addr;
176         u64 vm_entry_msr_load_addr;
177         u64 tsc_offset;
178         u64 virtual_apic_page_addr;
179         u64 apic_access_addr;
180         u64 ept_pointer;
181         u64 guest_physical_address;
182         u64 vmcs_link_pointer;
183         u64 guest_ia32_debugctl;
184         u64 guest_ia32_pat;
185         u64 guest_ia32_efer;
186         u64 guest_ia32_perf_global_ctrl;
187         u64 guest_pdptr0;
188         u64 guest_pdptr1;
189         u64 guest_pdptr2;
190         u64 guest_pdptr3;
191         u64 host_ia32_pat;
192         u64 host_ia32_efer;
193         u64 host_ia32_perf_global_ctrl;
194         u64 padding64[8]; /* room for future expansion */
195         /*
196          * To allow migration of L1 (complete with its L2 guests) between
197          * machines of different natural widths (32 or 64 bit), we cannot have
198          * unsigned long fields with no explict size. We use u64 (aliased
199          * natural_width) instead. Luckily, x86 is little-endian.
200          */
201         natural_width cr0_guest_host_mask;
202         natural_width cr4_guest_host_mask;
203         natural_width cr0_read_shadow;
204         natural_width cr4_read_shadow;
205         natural_width cr3_target_value0;
206         natural_width cr3_target_value1;
207         natural_width cr3_target_value2;
208         natural_width cr3_target_value3;
209         natural_width exit_qualification;
210         natural_width guest_linear_address;
211         natural_width guest_cr0;
212         natural_width guest_cr3;
213         natural_width guest_cr4;
214         natural_width guest_es_base;
215         natural_width guest_cs_base;
216         natural_width guest_ss_base;
217         natural_width guest_ds_base;
218         natural_width guest_fs_base;
219         natural_width guest_gs_base;
220         natural_width guest_ldtr_base;
221         natural_width guest_tr_base;
222         natural_width guest_gdtr_base;
223         natural_width guest_idtr_base;
224         natural_width guest_dr7;
225         natural_width guest_rsp;
226         natural_width guest_rip;
227         natural_width guest_rflags;
228         natural_width guest_pending_dbg_exceptions;
229         natural_width guest_sysenter_esp;
230         natural_width guest_sysenter_eip;
231         natural_width host_cr0;
232         natural_width host_cr3;
233         natural_width host_cr4;
234         natural_width host_fs_base;
235         natural_width host_gs_base;
236         natural_width host_tr_base;
237         natural_width host_gdtr_base;
238         natural_width host_idtr_base;
239         natural_width host_ia32_sysenter_esp;
240         natural_width host_ia32_sysenter_eip;
241         natural_width host_rsp;
242         natural_width host_rip;
243         natural_width paddingl[8]; /* room for future expansion */
244         u32 pin_based_vm_exec_control;
245         u32 cpu_based_vm_exec_control;
246         u32 exception_bitmap;
247         u32 page_fault_error_code_mask;
248         u32 page_fault_error_code_match;
249         u32 cr3_target_count;
250         u32 vm_exit_controls;
251         u32 vm_exit_msr_store_count;
252         u32 vm_exit_msr_load_count;
253         u32 vm_entry_controls;
254         u32 vm_entry_msr_load_count;
255         u32 vm_entry_intr_info_field;
256         u32 vm_entry_exception_error_code;
257         u32 vm_entry_instruction_len;
258         u32 tpr_threshold;
259         u32 secondary_vm_exec_control;
260         u32 vm_instruction_error;
261         u32 vm_exit_reason;
262         u32 vm_exit_intr_info;
263         u32 vm_exit_intr_error_code;
264         u32 idt_vectoring_info_field;
265         u32 idt_vectoring_error_code;
266         u32 vm_exit_instruction_len;
267         u32 vmx_instruction_info;
268         u32 guest_es_limit;
269         u32 guest_cs_limit;
270         u32 guest_ss_limit;
271         u32 guest_ds_limit;
272         u32 guest_fs_limit;
273         u32 guest_gs_limit;
274         u32 guest_ldtr_limit;
275         u32 guest_tr_limit;
276         u32 guest_gdtr_limit;
277         u32 guest_idtr_limit;
278         u32 guest_es_ar_bytes;
279         u32 guest_cs_ar_bytes;
280         u32 guest_ss_ar_bytes;
281         u32 guest_ds_ar_bytes;
282         u32 guest_fs_ar_bytes;
283         u32 guest_gs_ar_bytes;
284         u32 guest_ldtr_ar_bytes;
285         u32 guest_tr_ar_bytes;
286         u32 guest_interruptibility_info;
287         u32 guest_activity_state;
288         u32 guest_sysenter_cs;
289         u32 host_ia32_sysenter_cs;
290         u32 padding32[8]; /* room for future expansion */
291         u16 virtual_processor_id;
292         u16 guest_es_selector;
293         u16 guest_cs_selector;
294         u16 guest_ss_selector;
295         u16 guest_ds_selector;
296         u16 guest_fs_selector;
297         u16 guest_gs_selector;
298         u16 guest_ldtr_selector;
299         u16 guest_tr_selector;
300         u16 host_es_selector;
301         u16 host_cs_selector;
302         u16 host_ss_selector;
303         u16 host_ds_selector;
304         u16 host_fs_selector;
305         u16 host_gs_selector;
306         u16 host_tr_selector;
307 };
308
309 /*
310  * VMCS12_REVISION is an arbitrary id that should be changed if the content or
311  * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
312  * VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
313  */
314 #define VMCS12_REVISION 0x11e57ed0
315
316 /*
317  * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
318  * and any VMCS region. Although only sizeof(struct vmcs12) are used by the
319  * current implementation, 4K are reserved to avoid future complications.
320  */
321 #define VMCS12_SIZE 0x1000
322
323 /* Used to remember the last vmcs02 used for some recently used vmcs12s */
324 struct vmcs02_list {
325         struct list_head list;
326         gpa_t vmptr;
327         struct loaded_vmcs vmcs02;
328 };
329
330 /*
331  * The nested_vmx structure is part of vcpu_vmx, and holds information we need
332  * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
333  */
334 struct nested_vmx {
335         /* Has the level1 guest done vmxon? */
336         bool vmxon;
337
338         /* The guest-physical address of the current VMCS L1 keeps for L2 */
339         gpa_t current_vmptr;
340         /* The host-usable pointer to the above */
341         struct page *current_vmcs12_page;
342         struct vmcs12 *current_vmcs12;
343
344         /* vmcs02_list cache of VMCSs recently used to run L2 guests */
345         struct list_head vmcs02_pool;
346         int vmcs02_num;
347         u64 vmcs01_tsc_offset;
348         /* L2 must run next, and mustn't decide to exit to L1. */
349         bool nested_run_pending;
350         /*
351          * Guest pages referred to in vmcs02 with host-physical pointers, so
352          * we must keep them pinned while L2 runs.
353          */
354         struct page *apic_access_page;
355 };
356
357 struct vcpu_vmx {
358         struct kvm_vcpu       vcpu;
359         unsigned long         host_rsp;
360         u8                    fail;
361         u8                    cpl;
362         bool                  nmi_known_unmasked;
363         u32                   exit_intr_info;
364         u32                   idt_vectoring_info;
365         ulong                 rflags;
366         struct shared_msr_entry *guest_msrs;
367         int                   nmsrs;
368         int                   save_nmsrs;
369 #ifdef CONFIG_X86_64
370         u64                   msr_host_kernel_gs_base;
371         u64                   msr_guest_kernel_gs_base;
372 #endif
373         /*
374          * loaded_vmcs points to the VMCS currently used in this vcpu. For a
375          * non-nested (L1) guest, it always points to vmcs01. For a nested
376          * guest (L2), it points to a different VMCS.
377          */
378         struct loaded_vmcs    vmcs01;
379         struct loaded_vmcs   *loaded_vmcs;
380         bool                  __launched; /* temporary, used in vmx_vcpu_run */
381         struct msr_autoload {
382                 unsigned nr;
383                 struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS];
384                 struct vmx_msr_entry host[NR_AUTOLOAD_MSRS];
385         } msr_autoload;
386         struct {
387                 int           loaded;
388                 u16           fs_sel, gs_sel, ldt_sel;
389                 int           gs_ldt_reload_needed;
390                 int           fs_reload_needed;
391         } host_state;
392         struct {
393                 int vm86_active;
394                 ulong save_rflags;
395                 struct kvm_save_segment {
396                         u16 selector;
397                         unsigned long base;
398                         u32 limit;
399                         u32 ar;
400                 } tr, es, ds, fs, gs;
401         } rmode;
402         struct {
403                 u32 bitmask; /* 4 bits per segment (1 bit per field) */
404                 struct kvm_save_segment seg[8];
405         } segment_cache;
406         int vpid;
407         bool emulation_required;
408
409         /* Support for vnmi-less CPUs */
410         int soft_vnmi_blocked;
411         ktime_t entry_time;
412         s64 vnmi_blocked_time;
413         u32 exit_reason;
414
415         bool rdtscp_enabled;
416
417         /* Support for a guest hypervisor (nested VMX) */
418         struct nested_vmx nested;
419 };
420
421 enum segment_cache_field {
422         SEG_FIELD_SEL = 0,
423         SEG_FIELD_BASE = 1,
424         SEG_FIELD_LIMIT = 2,
425         SEG_FIELD_AR = 3,
426
427         SEG_FIELD_NR = 4
428 };
429
430 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
431 {
432         return container_of(vcpu, struct vcpu_vmx, vcpu);
433 }
434
435 #define VMCS12_OFFSET(x) offsetof(struct vmcs12, x)
436 #define FIELD(number, name)     [number] = VMCS12_OFFSET(name)
437 #define FIELD64(number, name)   [number] = VMCS12_OFFSET(name), \
438                                 [number##_HIGH] = VMCS12_OFFSET(name)+4
439
440 static unsigned short vmcs_field_to_offset_table[] = {
441         FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id),
442         FIELD(GUEST_ES_SELECTOR, guest_es_selector),
443         FIELD(GUEST_CS_SELECTOR, guest_cs_selector),
444         FIELD(GUEST_SS_SELECTOR, guest_ss_selector),
445         FIELD(GUEST_DS_SELECTOR, guest_ds_selector),
446         FIELD(GUEST_FS_SELECTOR, guest_fs_selector),
447         FIELD(GUEST_GS_SELECTOR, guest_gs_selector),
448         FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector),
449         FIELD(GUEST_TR_SELECTOR, guest_tr_selector),
450         FIELD(HOST_ES_SELECTOR, host_es_selector),
451         FIELD(HOST_CS_SELECTOR, host_cs_selector),
452         FIELD(HOST_SS_SELECTOR, host_ss_selector),
453         FIELD(HOST_DS_SELECTOR, host_ds_selector),
454         FIELD(HOST_FS_SELECTOR, host_fs_selector),
455         FIELD(HOST_GS_SELECTOR, host_gs_selector),
456         FIELD(HOST_TR_SELECTOR, host_tr_selector),
457         FIELD64(IO_BITMAP_A, io_bitmap_a),
458         FIELD64(IO_BITMAP_B, io_bitmap_b),
459         FIELD64(MSR_BITMAP, msr_bitmap),
460         FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr),
461         FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr),
462         FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr),
463         FIELD64(TSC_OFFSET, tsc_offset),
464         FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
465         FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
466         FIELD64(EPT_POINTER, ept_pointer),
467         FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address),
468         FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer),
469         FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl),
470         FIELD64(GUEST_IA32_PAT, guest_ia32_pat),
471         FIELD64(GUEST_IA32_EFER, guest_ia32_efer),
472         FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl),
473         FIELD64(GUEST_PDPTR0, guest_pdptr0),
474         FIELD64(GUEST_PDPTR1, guest_pdptr1),
475         FIELD64(GUEST_PDPTR2, guest_pdptr2),
476         FIELD64(GUEST_PDPTR3, guest_pdptr3),
477         FIELD64(HOST_IA32_PAT, host_ia32_pat),
478         FIELD64(HOST_IA32_EFER, host_ia32_efer),
479         FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl),
480         FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control),
481         FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control),
482         FIELD(EXCEPTION_BITMAP, exception_bitmap),
483         FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask),
484         FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match),
485         FIELD(CR3_TARGET_COUNT, cr3_target_count),
486         FIELD(VM_EXIT_CONTROLS, vm_exit_controls),
487         FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count),
488         FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count),
489         FIELD(VM_ENTRY_CONTROLS, vm_entry_controls),
490         FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count),
491         FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field),
492         FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code),
493         FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len),
494         FIELD(TPR_THRESHOLD, tpr_threshold),
495         FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control),
496         FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error),
497         FIELD(VM_EXIT_REASON, vm_exit_reason),
498         FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info),
499         FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code),
500         FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field),
501         FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code),
502         FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len),
503         FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info),
504         FIELD(GUEST_ES_LIMIT, guest_es_limit),
505         FIELD(GUEST_CS_LIMIT, guest_cs_limit),
506         FIELD(GUEST_SS_LIMIT, guest_ss_limit),
507         FIELD(GUEST_DS_LIMIT, guest_ds_limit),
508         FIELD(GUEST_FS_LIMIT, guest_fs_limit),
509         FIELD(GUEST_GS_LIMIT, guest_gs_limit),
510         FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit),
511         FIELD(GUEST_TR_LIMIT, guest_tr_limit),
512         FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit),
513         FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit),
514         FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes),
515         FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes),
516         FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes),
517         FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes),
518         FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes),
519         FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes),
520         FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes),
521         FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes),
522         FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info),
523         FIELD(GUEST_ACTIVITY_STATE, guest_activity_state),
524         FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs),
525         FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs),
526         FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask),
527         FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask),
528         FIELD(CR0_READ_SHADOW, cr0_read_shadow),
529         FIELD(CR4_READ_SHADOW, cr4_read_shadow),
530         FIELD(CR3_TARGET_VALUE0, cr3_target_value0),
531         FIELD(CR3_TARGET_VALUE1, cr3_target_value1),
532         FIELD(CR3_TARGET_VALUE2, cr3_target_value2),
533         FIELD(CR3_TARGET_VALUE3, cr3_target_value3),
534         FIELD(EXIT_QUALIFICATION, exit_qualification),
535         FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address),
536         FIELD(GUEST_CR0, guest_cr0),
537         FIELD(GUEST_CR3, guest_cr3),
538         FIELD(GUEST_CR4, guest_cr4),
539         FIELD(GUEST_ES_BASE, guest_es_base),
540         FIELD(GUEST_CS_BASE, guest_cs_base),
541         FIELD(GUEST_SS_BASE, guest_ss_base),
542         FIELD(GUEST_DS_BASE, guest_ds_base),
543         FIELD(GUEST_FS_BASE, guest_fs_base),
544         FIELD(GUEST_GS_BASE, guest_gs_base),
545         FIELD(GUEST_LDTR_BASE, guest_ldtr_base),
546         FIELD(GUEST_TR_BASE, guest_tr_base),
547         FIELD(GUEST_GDTR_BASE, guest_gdtr_base),
548         FIELD(GUEST_IDTR_BASE, guest_idtr_base),
549         FIELD(GUEST_DR7, guest_dr7),
550         FIELD(GUEST_RSP, guest_rsp),
551         FIELD(GUEST_RIP, guest_rip),
552         FIELD(GUEST_RFLAGS, guest_rflags),
553         FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions),
554         FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp),
555         FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip),
556         FIELD(HOST_CR0, host_cr0),
557         FIELD(HOST_CR3, host_cr3),
558         FIELD(HOST_CR4, host_cr4),
559         FIELD(HOST_FS_BASE, host_fs_base),
560         FIELD(HOST_GS_BASE, host_gs_base),
561         FIELD(HOST_TR_BASE, host_tr_base),
562         FIELD(HOST_GDTR_BASE, host_gdtr_base),
563         FIELD(HOST_IDTR_BASE, host_idtr_base),
564         FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp),
565         FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip),
566         FIELD(HOST_RSP, host_rsp),
567         FIELD(HOST_RIP, host_rip),
568 };
569 static const int max_vmcs_field = ARRAY_SIZE(vmcs_field_to_offset_table);
570
571 static inline short vmcs_field_to_offset(unsigned long field)
572 {
573         if (field >= max_vmcs_field || vmcs_field_to_offset_table[field] == 0)
574                 return -1;
575         return vmcs_field_to_offset_table[field];
576 }
577
578 static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
579 {
580         return to_vmx(vcpu)->nested.current_vmcs12;
581 }
582
583 static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr)
584 {
585         struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT);
586         if (is_error_page(page)) {
587                 kvm_release_page_clean(page);
588                 return NULL;
589         }
590         return page;
591 }
592
593 static void nested_release_page(struct page *page)
594 {
595         kvm_release_page_dirty(page);
596 }
597
598 static void nested_release_page_clean(struct page *page)
599 {
600         kvm_release_page_clean(page);
601 }
602
603 static u64 construct_eptp(unsigned long root_hpa);
604 static void kvm_cpu_vmxon(u64 addr);
605 static void kvm_cpu_vmxoff(void);
606 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
607 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
608
609 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
610 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
611 /*
612  * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed
613  * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it.
614  */
615 static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu);
616 static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
617
618 static unsigned long *vmx_io_bitmap_a;
619 static unsigned long *vmx_io_bitmap_b;
620 static unsigned long *vmx_msr_bitmap_legacy;
621 static unsigned long *vmx_msr_bitmap_longmode;
622
623 static bool cpu_has_load_ia32_efer;
624 static bool cpu_has_load_perf_global_ctrl;
625
626 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
627 static DEFINE_SPINLOCK(vmx_vpid_lock);
628
629 static struct vmcs_config {
630         int size;
631         int order;
632         u32 revision_id;
633         u32 pin_based_exec_ctrl;
634         u32 cpu_based_exec_ctrl;
635         u32 cpu_based_2nd_exec_ctrl;
636         u32 vmexit_ctrl;
637         u32 vmentry_ctrl;
638 } vmcs_config;
639
640 static struct vmx_capability {
641         u32 ept;
642         u32 vpid;
643 } vmx_capability;
644
645 #define VMX_SEGMENT_FIELD(seg)                                  \
646         [VCPU_SREG_##seg] = {                                   \
647                 .selector = GUEST_##seg##_SELECTOR,             \
648                 .base = GUEST_##seg##_BASE,                     \
649                 .limit = GUEST_##seg##_LIMIT,                   \
650                 .ar_bytes = GUEST_##seg##_AR_BYTES,             \
651         }
652
653 static struct kvm_vmx_segment_field {
654         unsigned selector;
655         unsigned base;
656         unsigned limit;
657         unsigned ar_bytes;
658 } kvm_vmx_segment_fields[] = {
659         VMX_SEGMENT_FIELD(CS),
660         VMX_SEGMENT_FIELD(DS),
661         VMX_SEGMENT_FIELD(ES),
662         VMX_SEGMENT_FIELD(FS),
663         VMX_SEGMENT_FIELD(GS),
664         VMX_SEGMENT_FIELD(SS),
665         VMX_SEGMENT_FIELD(TR),
666         VMX_SEGMENT_FIELD(LDTR),
667 };
668
669 static u64 host_efer;
670
671 static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
672
673 /*
674  * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it
675  * away by decrementing the array size.
676  */
677 static const u32 vmx_msr_index[] = {
678 #ifdef CONFIG_X86_64
679         MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR,
680 #endif
681         MSR_EFER, MSR_TSC_AUX, MSR_STAR,
682 };
683 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
684
685 static inline bool is_page_fault(u32 intr_info)
686 {
687         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
688                              INTR_INFO_VALID_MASK)) ==
689                 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
690 }
691
692 static inline bool is_no_device(u32 intr_info)
693 {
694         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
695                              INTR_INFO_VALID_MASK)) ==
696                 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
697 }
698
699 static inline bool is_invalid_opcode(u32 intr_info)
700 {
701         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
702                              INTR_INFO_VALID_MASK)) ==
703                 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
704 }
705
706 static inline bool is_external_interrupt(u32 intr_info)
707 {
708         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
709                 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
710 }
711
712 static inline bool is_machine_check(u32 intr_info)
713 {
714         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
715                              INTR_INFO_VALID_MASK)) ==
716                 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
717 }
718
719 static inline bool cpu_has_vmx_msr_bitmap(void)
720 {
721         return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
722 }
723
724 static inline bool cpu_has_vmx_tpr_shadow(void)
725 {
726         return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
727 }
728
729 static inline bool vm_need_tpr_shadow(struct kvm *kvm)
730 {
731         return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
732 }
733
734 static inline bool cpu_has_secondary_exec_ctrls(void)
735 {
736         return vmcs_config.cpu_based_exec_ctrl &
737                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
738 }
739
740 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
741 {
742         return vmcs_config.cpu_based_2nd_exec_ctrl &
743                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
744 }
745
746 static inline bool cpu_has_vmx_flexpriority(void)
747 {
748         return cpu_has_vmx_tpr_shadow() &&
749                 cpu_has_vmx_virtualize_apic_accesses();
750 }
751
752 static inline bool cpu_has_vmx_ept_execute_only(void)
753 {
754         return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT;
755 }
756
757 static inline bool cpu_has_vmx_eptp_uncacheable(void)
758 {
759         return vmx_capability.ept & VMX_EPTP_UC_BIT;
760 }
761
762 static inline bool cpu_has_vmx_eptp_writeback(void)
763 {
764         return vmx_capability.ept & VMX_EPTP_WB_BIT;
765 }
766
767 static inline bool cpu_has_vmx_ept_2m_page(void)
768 {
769         return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT;
770 }
771
772 static inline bool cpu_has_vmx_ept_1g_page(void)
773 {
774         return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
775 }
776
777 static inline bool cpu_has_vmx_ept_4levels(void)
778 {
779         return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
780 }
781
782 static inline bool cpu_has_vmx_invept_individual_addr(void)
783 {
784         return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
785 }
786
787 static inline bool cpu_has_vmx_invept_context(void)
788 {
789         return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT;
790 }
791
792 static inline bool cpu_has_vmx_invept_global(void)
793 {
794         return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT;
795 }
796
797 static inline bool cpu_has_vmx_invvpid_single(void)
798 {
799         return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
800 }
801
802 static inline bool cpu_has_vmx_invvpid_global(void)
803 {
804         return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
805 }
806
807 static inline bool cpu_has_vmx_ept(void)
808 {
809         return vmcs_config.cpu_based_2nd_exec_ctrl &
810                 SECONDARY_EXEC_ENABLE_EPT;
811 }
812
813 static inline bool cpu_has_vmx_unrestricted_guest(void)
814 {
815         return vmcs_config.cpu_based_2nd_exec_ctrl &
816                 SECONDARY_EXEC_UNRESTRICTED_GUEST;
817 }
818
819 static inline bool cpu_has_vmx_ple(void)
820 {
821         return vmcs_config.cpu_based_2nd_exec_ctrl &
822                 SECONDARY_EXEC_PAUSE_LOOP_EXITING;
823 }
824
825 static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm)
826 {
827         return flexpriority_enabled && irqchip_in_kernel(kvm);
828 }
829
830 static inline bool cpu_has_vmx_vpid(void)
831 {
832         return vmcs_config.cpu_based_2nd_exec_ctrl &
833                 SECONDARY_EXEC_ENABLE_VPID;
834 }
835
836 static inline bool cpu_has_vmx_rdtscp(void)
837 {
838         return vmcs_config.cpu_based_2nd_exec_ctrl &
839                 SECONDARY_EXEC_RDTSCP;
840 }
841
842 static inline bool cpu_has_virtual_nmis(void)
843 {
844         return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
845 }
846
847 static inline bool cpu_has_vmx_wbinvd_exit(void)
848 {
849         return vmcs_config.cpu_based_2nd_exec_ctrl &
850                 SECONDARY_EXEC_WBINVD_EXITING;
851 }
852
853 static inline bool report_flexpriority(void)
854 {
855         return flexpriority_enabled;
856 }
857
858 static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
859 {
860         return vmcs12->cpu_based_vm_exec_control & bit;
861 }
862
863 static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit)
864 {
865         return (vmcs12->cpu_based_vm_exec_control &
866                         CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
867                 (vmcs12->secondary_vm_exec_control & bit);
868 }
869
870 static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12,
871         struct kvm_vcpu *vcpu)
872 {
873         return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS;
874 }
875
876 static inline bool is_exception(u32 intr_info)
877 {
878         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
879                 == (INTR_TYPE_HARD_EXCEPTION | INTR_INFO_VALID_MASK);
880 }
881
882 static void nested_vmx_vmexit(struct kvm_vcpu *vcpu);
883 static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
884                         struct vmcs12 *vmcs12,
885                         u32 reason, unsigned long qualification);
886
887 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
888 {
889         int i;
890
891         for (i = 0; i < vmx->nmsrs; ++i)
892                 if (vmx_msr_index[vmx->guest_msrs[i].index] == msr)
893                         return i;
894         return -1;
895 }
896
897 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
898 {
899     struct {
900         u64 vpid : 16;
901         u64 rsvd : 48;
902         u64 gva;
903     } operand = { vpid, 0, gva };
904
905     asm volatile (__ex(ASM_VMX_INVVPID)
906                   /* CF==1 or ZF==1 --> rc = -1 */
907                   "; ja 1f ; ud2 ; 1:"
908                   : : "a"(&operand), "c"(ext) : "cc", "memory");
909 }
910
911 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
912 {
913         struct {
914                 u64 eptp, gpa;
915         } operand = {eptp, gpa};
916
917         asm volatile (__ex(ASM_VMX_INVEPT)
918                         /* CF==1 or ZF==1 --> rc = -1 */
919                         "; ja 1f ; ud2 ; 1:\n"
920                         : : "a" (&operand), "c" (ext) : "cc", "memory");
921 }
922
923 static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
924 {
925         int i;
926
927         i = __find_msr_index(vmx, msr);
928         if (i >= 0)
929                 return &vmx->guest_msrs[i];
930         return NULL;
931 }
932
933 static void vmcs_clear(struct vmcs *vmcs)
934 {
935         u64 phys_addr = __pa(vmcs);
936         u8 error;
937
938         asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
939                       : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
940                       : "cc", "memory");
941         if (error)
942                 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
943                        vmcs, phys_addr);
944 }
945
946 static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
947 {
948         vmcs_clear(loaded_vmcs->vmcs);
949         loaded_vmcs->cpu = -1;
950         loaded_vmcs->launched = 0;
951 }
952
953 static void vmcs_load(struct vmcs *vmcs)
954 {
955         u64 phys_addr = __pa(vmcs);
956         u8 error;
957
958         asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
959                         : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
960                         : "cc", "memory");
961         if (error)
962                 printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n",
963                        vmcs, phys_addr);
964 }
965
966 static void __loaded_vmcs_clear(void *arg)
967 {
968         struct loaded_vmcs *loaded_vmcs = arg;
969         int cpu = raw_smp_processor_id();
970
971         if (loaded_vmcs->cpu != cpu)
972                 return; /* vcpu migration can race with cpu offline */
973         if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs)
974                 per_cpu(current_vmcs, cpu) = NULL;
975         list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link);
976         loaded_vmcs_init(loaded_vmcs);
977 }
978
979 static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs)
980 {
981         if (loaded_vmcs->cpu != -1)
982                 smp_call_function_single(
983                         loaded_vmcs->cpu, __loaded_vmcs_clear, loaded_vmcs, 1);
984 }
985
986 static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx)
987 {
988         if (vmx->vpid == 0)
989                 return;
990
991         if (cpu_has_vmx_invvpid_single())
992                 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
993 }
994
995 static inline void vpid_sync_vcpu_global(void)
996 {
997         if (cpu_has_vmx_invvpid_global())
998                 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
999 }
1000
1001 static inline void vpid_sync_context(struct vcpu_vmx *vmx)
1002 {
1003         if (cpu_has_vmx_invvpid_single())
1004                 vpid_sync_vcpu_single(vmx);
1005         else
1006                 vpid_sync_vcpu_global();
1007 }
1008
1009 static inline void ept_sync_global(void)
1010 {
1011         if (cpu_has_vmx_invept_global())
1012                 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
1013 }
1014
1015 static inline void ept_sync_context(u64 eptp)
1016 {
1017         if (enable_ept) {
1018                 if (cpu_has_vmx_invept_context())
1019                         __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
1020                 else
1021                         ept_sync_global();
1022         }
1023 }
1024
1025 static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
1026 {
1027         if (enable_ept) {
1028                 if (cpu_has_vmx_invept_individual_addr())
1029                         __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
1030                                         eptp, gpa);
1031                 else
1032                         ept_sync_context(eptp);
1033         }
1034 }
1035
1036 static __always_inline unsigned long vmcs_readl(unsigned long field)
1037 {
1038         unsigned long value;
1039
1040         asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0")
1041                       : "=a"(value) : "d"(field) : "cc");
1042         return value;
1043 }
1044
1045 static __always_inline u16 vmcs_read16(unsigned long field)
1046 {
1047         return vmcs_readl(field);
1048 }
1049
1050 static __always_inline u32 vmcs_read32(unsigned long field)
1051 {
1052         return vmcs_readl(field);
1053 }
1054
1055 static __always_inline u64 vmcs_read64(unsigned long field)
1056 {
1057 #ifdef CONFIG_X86_64
1058         return vmcs_readl(field);
1059 #else
1060         return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
1061 #endif
1062 }
1063
1064 static noinline void vmwrite_error(unsigned long field, unsigned long value)
1065 {
1066         printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
1067                field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
1068         dump_stack();
1069 }
1070
1071 static void vmcs_writel(unsigned long field, unsigned long value)
1072 {
1073         u8 error;
1074
1075         asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
1076                        : "=q"(error) : "a"(value), "d"(field) : "cc");
1077         if (unlikely(error))
1078                 vmwrite_error(field, value);
1079 }
1080
1081 static void vmcs_write16(unsigned long field, u16 value)
1082 {
1083         vmcs_writel(field, value);
1084 }
1085
1086 static void vmcs_write32(unsigned long field, u32 value)
1087 {
1088         vmcs_writel(field, value);
1089 }
1090
1091 static void vmcs_write64(unsigned long field, u64 value)
1092 {
1093         vmcs_writel(field, value);
1094 #ifndef CONFIG_X86_64
1095         asm volatile ("");
1096         vmcs_writel(field+1, value >> 32);
1097 #endif
1098 }
1099
1100 static void vmcs_clear_bits(unsigned long field, u32 mask)
1101 {
1102         vmcs_writel(field, vmcs_readl(field) & ~mask);
1103 }
1104
1105 static void vmcs_set_bits(unsigned long field, u32 mask)
1106 {
1107         vmcs_writel(field, vmcs_readl(field) | mask);
1108 }
1109
1110 static void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
1111 {
1112         vmx->segment_cache.bitmask = 0;
1113 }
1114
1115 static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg,
1116                                        unsigned field)
1117 {
1118         bool ret;
1119         u32 mask = 1 << (seg * SEG_FIELD_NR + field);
1120
1121         if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) {
1122                 vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS);
1123                 vmx->segment_cache.bitmask = 0;
1124         }
1125         ret = vmx->segment_cache.bitmask & mask;
1126         vmx->segment_cache.bitmask |= mask;
1127         return ret;
1128 }
1129
1130 static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg)
1131 {
1132         u16 *p = &vmx->segment_cache.seg[seg].selector;
1133
1134         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL))
1135                 *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector);
1136         return *p;
1137 }
1138
1139 static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg)
1140 {
1141         ulong *p = &vmx->segment_cache.seg[seg].base;
1142
1143         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE))
1144                 *p = vmcs_readl(kvm_vmx_segment_fields[seg].base);
1145         return *p;
1146 }
1147
1148 static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg)
1149 {
1150         u32 *p = &vmx->segment_cache.seg[seg].limit;
1151
1152         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT))
1153                 *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit);
1154         return *p;
1155 }
1156
1157 static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg)
1158 {
1159         u32 *p = &vmx->segment_cache.seg[seg].ar;
1160
1161         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR))
1162                 *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes);
1163         return *p;
1164 }
1165
1166 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
1167 {
1168         u32 eb;
1169
1170         eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) |
1171              (1u << NM_VECTOR) | (1u << DB_VECTOR);
1172         if ((vcpu->guest_debug &
1173              (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) ==
1174             (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP))
1175                 eb |= 1u << BP_VECTOR;
1176         if (to_vmx(vcpu)->rmode.vm86_active)
1177                 eb = ~0;
1178         if (enable_ept)
1179                 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
1180         if (vcpu->fpu_active)
1181                 eb &= ~(1u << NM_VECTOR);
1182
1183         /* When we are running a nested L2 guest and L1 specified for it a
1184          * certain exception bitmap, we must trap the same exceptions and pass
1185          * them to L1. When running L2, we will only handle the exceptions
1186          * specified above if L1 did not want them.
1187          */
1188         if (is_guest_mode(vcpu))
1189                 eb |= get_vmcs12(vcpu)->exception_bitmap;
1190
1191         vmcs_write32(EXCEPTION_BITMAP, eb);
1192 }
1193
1194 static void clear_atomic_switch_msr_special(unsigned long entry,
1195                 unsigned long exit)
1196 {
1197         vmcs_clear_bits(VM_ENTRY_CONTROLS, entry);
1198         vmcs_clear_bits(VM_EXIT_CONTROLS, exit);
1199 }
1200
1201 static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
1202 {
1203         unsigned i;
1204         struct msr_autoload *m = &vmx->msr_autoload;
1205
1206         switch (msr) {
1207         case MSR_EFER:
1208                 if (cpu_has_load_ia32_efer) {
1209                         clear_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER,
1210                                         VM_EXIT_LOAD_IA32_EFER);
1211                         return;
1212                 }
1213                 break;
1214         case MSR_CORE_PERF_GLOBAL_CTRL:
1215                 if (cpu_has_load_perf_global_ctrl) {
1216                         clear_atomic_switch_msr_special(
1217                                         VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
1218                                         VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
1219                         return;
1220                 }
1221                 break;
1222         }
1223
1224         for (i = 0; i < m->nr; ++i)
1225                 if (m->guest[i].index == msr)
1226                         break;
1227
1228         if (i == m->nr)
1229                 return;
1230         --m->nr;
1231         m->guest[i] = m->guest[m->nr];
1232         m->host[i] = m->host[m->nr];
1233         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
1234         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
1235 }
1236
1237 static void add_atomic_switch_msr_special(unsigned long entry,
1238                 unsigned long exit, unsigned long guest_val_vmcs,
1239                 unsigned long host_val_vmcs, u64 guest_val, u64 host_val)
1240 {
1241         vmcs_write64(guest_val_vmcs, guest_val);
1242         vmcs_write64(host_val_vmcs, host_val);
1243         vmcs_set_bits(VM_ENTRY_CONTROLS, entry);
1244         vmcs_set_bits(VM_EXIT_CONTROLS, exit);
1245 }
1246
1247 static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
1248                                   u64 guest_val, u64 host_val)
1249 {
1250         unsigned i;
1251         struct msr_autoload *m = &vmx->msr_autoload;
1252
1253         switch (msr) {
1254         case MSR_EFER:
1255                 if (cpu_has_load_ia32_efer) {
1256                         add_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER,
1257                                         VM_EXIT_LOAD_IA32_EFER,
1258                                         GUEST_IA32_EFER,
1259                                         HOST_IA32_EFER,
1260                                         guest_val, host_val);
1261                         return;
1262                 }
1263                 break;
1264         case MSR_CORE_PERF_GLOBAL_CTRL:
1265                 if (cpu_has_load_perf_global_ctrl) {
1266                         add_atomic_switch_msr_special(
1267                                         VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
1268                                         VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL,
1269                                         GUEST_IA32_PERF_GLOBAL_CTRL,
1270                                         HOST_IA32_PERF_GLOBAL_CTRL,
1271                                         guest_val, host_val);
1272                         return;
1273                 }
1274                 break;
1275         }
1276
1277         for (i = 0; i < m->nr; ++i)
1278                 if (m->guest[i].index == msr)
1279                         break;
1280
1281         if (i == NR_AUTOLOAD_MSRS) {
1282                 printk_once(KERN_WARNING"Not enough mst switch entries. "
1283                                 "Can't add msr %x\n", msr);
1284                 return;
1285         } else if (i == m->nr) {
1286                 ++m->nr;
1287                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
1288                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
1289         }
1290
1291         m->guest[i].index = msr;
1292         m->guest[i].value = guest_val;
1293         m->host[i].index = msr;
1294         m->host[i].value = host_val;
1295 }
1296
1297 static void reload_tss(void)
1298 {
1299         /*
1300          * VT restores TR but not its size.  Useless.
1301          */
1302         struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
1303         struct desc_struct *descs;
1304
1305         descs = (void *)gdt->address;
1306         descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
1307         load_TR_desc();
1308 }
1309
1310 static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
1311 {
1312         u64 guest_efer;
1313         u64 ignore_bits;
1314
1315         guest_efer = vmx->vcpu.arch.efer;
1316
1317         /*
1318          * NX is emulated; LMA and LME handled by hardware; SCE meaninless
1319          * outside long mode
1320          */
1321         ignore_bits = EFER_NX | EFER_SCE;
1322 #ifdef CONFIG_X86_64
1323         ignore_bits |= EFER_LMA | EFER_LME;
1324         /* SCE is meaningful only in long mode on Intel */
1325         if (guest_efer & EFER_LMA)
1326                 ignore_bits &= ~(u64)EFER_SCE;
1327 #endif
1328         guest_efer &= ~ignore_bits;
1329         guest_efer |= host_efer & ignore_bits;
1330         vmx->guest_msrs[efer_offset].data = guest_efer;
1331         vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
1332
1333         clear_atomic_switch_msr(vmx, MSR_EFER);
1334         /* On ept, can't emulate nx, and must switch nx atomically */
1335         if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) {
1336                 guest_efer = vmx->vcpu.arch.efer;
1337                 if (!(guest_efer & EFER_LMA))
1338                         guest_efer &= ~EFER_LME;
1339                 add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer);
1340                 return false;
1341         }
1342
1343         return true;
1344 }
1345
1346 static unsigned long segment_base(u16 selector)
1347 {
1348         struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
1349         struct desc_struct *d;
1350         unsigned long table_base;
1351         unsigned long v;
1352
1353         if (!(selector & ~3))
1354                 return 0;
1355
1356         table_base = gdt->address;
1357
1358         if (selector & 4) {           /* from ldt */
1359                 u16 ldt_selector = kvm_read_ldt();
1360
1361                 if (!(ldt_selector & ~3))
1362                         return 0;
1363
1364                 table_base = segment_base(ldt_selector);
1365         }
1366         d = (struct desc_struct *)(table_base + (selector & ~7));
1367         v = get_desc_base(d);
1368 #ifdef CONFIG_X86_64
1369        if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
1370                v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
1371 #endif
1372         return v;
1373 }
1374
1375 static inline unsigned long kvm_read_tr_base(void)
1376 {
1377         u16 tr;
1378         asm("str %0" : "=g"(tr));
1379         return segment_base(tr);
1380 }
1381
1382 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
1383 {
1384         struct vcpu_vmx *vmx = to_vmx(vcpu);
1385         int i;
1386
1387         if (vmx->host_state.loaded)
1388                 return;
1389
1390         vmx->host_state.loaded = 1;
1391         /*
1392          * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
1393          * allow segment selectors with cpl > 0 or ti == 1.
1394          */
1395         vmx->host_state.ldt_sel = kvm_read_ldt();
1396         vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
1397         savesegment(fs, vmx->host_state.fs_sel);
1398         if (!(vmx->host_state.fs_sel & 7)) {
1399                 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
1400                 vmx->host_state.fs_reload_needed = 0;
1401         } else {
1402                 vmcs_write16(HOST_FS_SELECTOR, 0);
1403                 vmx->host_state.fs_reload_needed = 1;
1404         }
1405         savesegment(gs, vmx->host_state.gs_sel);
1406         if (!(vmx->host_state.gs_sel & 7))
1407                 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
1408         else {
1409                 vmcs_write16(HOST_GS_SELECTOR, 0);
1410                 vmx->host_state.gs_ldt_reload_needed = 1;
1411         }
1412
1413 #ifdef CONFIG_X86_64
1414         vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
1415         vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
1416 #else
1417         vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
1418         vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
1419 #endif
1420
1421 #ifdef CONFIG_X86_64
1422         rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
1423         if (is_long_mode(&vmx->vcpu))
1424                 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
1425 #endif
1426         for (i = 0; i < vmx->save_nmsrs; ++i)
1427                 kvm_set_shared_msr(vmx->guest_msrs[i].index,
1428                                    vmx->guest_msrs[i].data,
1429                                    vmx->guest_msrs[i].mask);
1430 }
1431
1432 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
1433 {
1434         if (!vmx->host_state.loaded)
1435                 return;
1436
1437         ++vmx->vcpu.stat.host_state_reload;
1438         vmx->host_state.loaded = 0;
1439 #ifdef CONFIG_X86_64
1440         if (is_long_mode(&vmx->vcpu))
1441                 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
1442 #endif
1443         if (vmx->host_state.gs_ldt_reload_needed) {
1444                 kvm_load_ldt(vmx->host_state.ldt_sel);
1445 #ifdef CONFIG_X86_64
1446                 load_gs_index(vmx->host_state.gs_sel);
1447 #else
1448                 loadsegment(gs, vmx->host_state.gs_sel);
1449 #endif
1450         }
1451         if (vmx->host_state.fs_reload_needed)
1452                 loadsegment(fs, vmx->host_state.fs_sel);
1453         reload_tss();
1454 #ifdef CONFIG_X86_64
1455         wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
1456 #endif
1457         if (user_has_fpu())
1458                 clts();
1459         load_gdt(&__get_cpu_var(host_gdt));
1460 }
1461
1462 static void vmx_load_host_state(struct vcpu_vmx *vmx)
1463 {
1464         preempt_disable();
1465         __vmx_load_host_state(vmx);
1466         preempt_enable();
1467 }
1468
1469 /*
1470  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
1471  * vcpu mutex is already taken.
1472  */
1473 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1474 {
1475         struct vcpu_vmx *vmx = to_vmx(vcpu);
1476         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1477
1478         if (!vmm_exclusive)
1479                 kvm_cpu_vmxon(phys_addr);
1480         else if (vmx->loaded_vmcs->cpu != cpu)
1481                 loaded_vmcs_clear(vmx->loaded_vmcs);
1482
1483         if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) {
1484                 per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs;
1485                 vmcs_load(vmx->loaded_vmcs->vmcs);
1486         }
1487
1488         if (vmx->loaded_vmcs->cpu != cpu) {
1489                 struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
1490                 unsigned long sysenter_esp;
1491
1492                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1493                 local_irq_disable();
1494                 list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link,
1495                          &per_cpu(loaded_vmcss_on_cpu, cpu));
1496                 local_irq_enable();
1497
1498                 /*
1499                  * Linux uses per-cpu TSS and GDT, so set these when switching
1500                  * processors.
1501                  */
1502                 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
1503                 vmcs_writel(HOST_GDTR_BASE, gdt->address);   /* 22.2.4 */
1504
1505                 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
1506                 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
1507                 vmx->loaded_vmcs->cpu = cpu;
1508         }
1509 }
1510
1511 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
1512 {
1513         __vmx_load_host_state(to_vmx(vcpu));
1514         if (!vmm_exclusive) {
1515                 __loaded_vmcs_clear(to_vmx(vcpu)->loaded_vmcs);
1516                 vcpu->cpu = -1;
1517                 kvm_cpu_vmxoff();
1518         }
1519 }
1520
1521 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
1522 {
1523         ulong cr0;
1524
1525         if (vcpu->fpu_active)
1526                 return;
1527         vcpu->fpu_active = 1;
1528         cr0 = vmcs_readl(GUEST_CR0);
1529         cr0 &= ~(X86_CR0_TS | X86_CR0_MP);
1530         cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP);
1531         vmcs_writel(GUEST_CR0, cr0);
1532         update_exception_bitmap(vcpu);
1533         vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
1534         if (is_guest_mode(vcpu))
1535                 vcpu->arch.cr0_guest_owned_bits &=
1536                         ~get_vmcs12(vcpu)->cr0_guest_host_mask;
1537         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
1538 }
1539
1540 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);
1541
1542 /*
1543  * Return the cr0 value that a nested guest would read. This is a combination
1544  * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by
1545  * its hypervisor (cr0_read_shadow).
1546  */
1547 static inline unsigned long nested_read_cr0(struct vmcs12 *fields)
1548 {
1549         return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) |
1550                 (fields->cr0_read_shadow & fields->cr0_guest_host_mask);
1551 }
1552 static inline unsigned long nested_read_cr4(struct vmcs12 *fields)
1553 {
1554         return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) |
1555                 (fields->cr4_read_shadow & fields->cr4_guest_host_mask);
1556 }
1557
1558 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
1559 {
1560         /* Note that there is no vcpu->fpu_active = 0 here. The caller must
1561          * set this *before* calling this function.
1562          */
1563         vmx_decache_cr0_guest_bits(vcpu);
1564         vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP);
1565         update_exception_bitmap(vcpu);
1566         vcpu->arch.cr0_guest_owned_bits = 0;
1567         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
1568         if (is_guest_mode(vcpu)) {
1569                 /*
1570                  * L1's specified read shadow might not contain the TS bit,
1571                  * so now that we turned on shadowing of this bit, we need to
1572                  * set this bit of the shadow. Like in nested_vmx_run we need
1573                  * nested_read_cr0(vmcs12), but vmcs12->guest_cr0 is not yet
1574                  * up-to-date here because we just decached cr0.TS (and we'll
1575                  * only update vmcs12->guest_cr0 on nested exit).
1576                  */
1577                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
1578                 vmcs12->guest_cr0 = (vmcs12->guest_cr0 & ~X86_CR0_TS) |
1579                         (vcpu->arch.cr0 & X86_CR0_TS);
1580                 vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
1581         } else
1582                 vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
1583 }
1584
1585 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
1586 {
1587         unsigned long rflags, save_rflags;
1588
1589         if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) {
1590                 __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
1591                 rflags = vmcs_readl(GUEST_RFLAGS);
1592                 if (to_vmx(vcpu)->rmode.vm86_active) {
1593                         rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
1594                         save_rflags = to_vmx(vcpu)->rmode.save_rflags;
1595                         rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
1596                 }
1597                 to_vmx(vcpu)->rflags = rflags;
1598         }
1599         return to_vmx(vcpu)->rflags;
1600 }
1601
1602 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
1603 {
1604         __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
1605         __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
1606         to_vmx(vcpu)->rflags = rflags;
1607         if (to_vmx(vcpu)->rmode.vm86_active) {
1608                 to_vmx(vcpu)->rmode.save_rflags = rflags;
1609                 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1610         }
1611         vmcs_writel(GUEST_RFLAGS, rflags);
1612 }
1613
1614 static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
1615 {
1616         u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
1617         int ret = 0;
1618
1619         if (interruptibility & GUEST_INTR_STATE_STI)
1620                 ret |= KVM_X86_SHADOW_INT_STI;
1621         if (interruptibility & GUEST_INTR_STATE_MOV_SS)
1622                 ret |= KVM_X86_SHADOW_INT_MOV_SS;
1623
1624         return ret & mask;
1625 }
1626
1627 static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
1628 {
1629         u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
1630         u32 interruptibility = interruptibility_old;
1631
1632         interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
1633
1634         if (mask & KVM_X86_SHADOW_INT_MOV_SS)
1635                 interruptibility |= GUEST_INTR_STATE_MOV_SS;
1636         else if (mask & KVM_X86_SHADOW_INT_STI)
1637                 interruptibility |= GUEST_INTR_STATE_STI;
1638
1639         if ((interruptibility != interruptibility_old))
1640                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
1641 }
1642
1643 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
1644 {
1645         unsigned long rip;
1646
1647         rip = kvm_rip_read(vcpu);
1648         rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
1649         kvm_rip_write(vcpu, rip);
1650
1651         /* skipping an emulated instruction also counts */
1652         vmx_set_interrupt_shadow(vcpu, 0);
1653 }
1654
1655 /*
1656  * KVM wants to inject page-faults which it got to the guest. This function
1657  * checks whether in a nested guest, we need to inject them to L1 or L2.
1658  * This function assumes it is called with the exit reason in vmcs02 being
1659  * a #PF exception (this is the only case in which KVM injects a #PF when L2
1660  * is running).
1661  */
1662 static int nested_pf_handled(struct kvm_vcpu *vcpu)
1663 {
1664         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
1665
1666         /* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
1667         if (!(vmcs12->exception_bitmap & (1u << PF_VECTOR)))
1668                 return 0;
1669
1670         nested_vmx_vmexit(vcpu);
1671         return 1;
1672 }
1673
1674 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
1675                                 bool has_error_code, u32 error_code,
1676                                 bool reinject)
1677 {
1678         struct vcpu_vmx *vmx = to_vmx(vcpu);
1679         u32 intr_info = nr | INTR_INFO_VALID_MASK;
1680
1681         if (nr == PF_VECTOR && is_guest_mode(vcpu) &&
1682                 nested_pf_handled(vcpu))
1683                 return;
1684
1685         if (has_error_code) {
1686                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
1687                 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
1688         }
1689
1690         if (vmx->rmode.vm86_active) {
1691                 int inc_eip = 0;
1692                 if (kvm_exception_is_soft(nr))
1693                         inc_eip = vcpu->arch.event_exit_inst_len;
1694                 if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE)
1695                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
1696                 return;
1697         }
1698
1699         if (kvm_exception_is_soft(nr)) {
1700                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
1701                              vmx->vcpu.arch.event_exit_inst_len);
1702                 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
1703         } else
1704                 intr_info |= INTR_TYPE_HARD_EXCEPTION;
1705
1706         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
1707 }
1708
1709 static bool vmx_rdtscp_supported(void)
1710 {
1711         return cpu_has_vmx_rdtscp();
1712 }
1713
1714 /*
1715  * Swap MSR entry in host/guest MSR entry array.
1716  */
1717 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
1718 {
1719         struct shared_msr_entry tmp;
1720
1721         tmp = vmx->guest_msrs[to];
1722         vmx->guest_msrs[to] = vmx->guest_msrs[from];
1723         vmx->guest_msrs[from] = tmp;
1724 }
1725
1726 /*
1727  * Set up the vmcs to automatically save and restore system
1728  * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
1729  * mode, as fiddling with msrs is very expensive.
1730  */
1731 static void setup_msrs(struct vcpu_vmx *vmx)
1732 {
1733         int save_nmsrs, index;
1734         unsigned long *msr_bitmap;
1735
1736         save_nmsrs = 0;
1737 #ifdef CONFIG_X86_64
1738         if (is_long_mode(&vmx->vcpu)) {
1739                 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
1740                 if (index >= 0)
1741                         move_msr_up(vmx, index, save_nmsrs++);
1742                 index = __find_msr_index(vmx, MSR_LSTAR);
1743                 if (index >= 0)
1744                         move_msr_up(vmx, index, save_nmsrs++);
1745                 index = __find_msr_index(vmx, MSR_CSTAR);
1746                 if (index >= 0)
1747                         move_msr_up(vmx, index, save_nmsrs++);
1748                 index = __find_msr_index(vmx, MSR_TSC_AUX);
1749                 if (index >= 0 && vmx->rdtscp_enabled)
1750                         move_msr_up(vmx, index, save_nmsrs++);
1751                 /*
1752                  * MSR_STAR is only needed on long mode guests, and only
1753                  * if efer.sce is enabled.
1754                  */
1755                 index = __find_msr_index(vmx, MSR_STAR);
1756                 if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE))
1757                         move_msr_up(vmx, index, save_nmsrs++);
1758         }
1759 #endif
1760         index = __find_msr_index(vmx, MSR_EFER);
1761         if (index >= 0 && update_transition_efer(vmx, index))
1762                 move_msr_up(vmx, index, save_nmsrs++);
1763
1764         vmx->save_nmsrs = save_nmsrs;
1765
1766         if (cpu_has_vmx_msr_bitmap()) {
1767                 if (is_long_mode(&vmx->vcpu))
1768                         msr_bitmap = vmx_msr_bitmap_longmode;
1769                 else
1770                         msr_bitmap = vmx_msr_bitmap_legacy;
1771
1772                 vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
1773         }
1774 }
1775
1776 /*
1777  * reads and returns guest's timestamp counter "register"
1778  * guest_tsc = host_tsc + tsc_offset    -- 21.3
1779  */
1780 static u64 guest_read_tsc(void)
1781 {
1782         u64 host_tsc, tsc_offset;
1783
1784         rdtscll(host_tsc);
1785         tsc_offset = vmcs_read64(TSC_OFFSET);
1786         return host_tsc + tsc_offset;
1787 }
1788
1789 /*
1790  * Like guest_read_tsc, but always returns L1's notion of the timestamp
1791  * counter, even if a nested guest (L2) is currently running.
1792  */
1793 u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu)
1794 {
1795         u64 host_tsc, tsc_offset;
1796
1797         rdtscll(host_tsc);
1798         tsc_offset = is_guest_mode(vcpu) ?
1799                 to_vmx(vcpu)->nested.vmcs01_tsc_offset :
1800                 vmcs_read64(TSC_OFFSET);
1801         return host_tsc + tsc_offset;
1802 }
1803
1804 /*
1805  * Engage any workarounds for mis-matched TSC rates.  Currently limited to
1806  * software catchup for faster rates on slower CPUs.
1807  */
1808 static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz, bool scale)
1809 {
1810         if (!scale)
1811                 return;
1812
1813         if (user_tsc_khz > tsc_khz) {
1814                 vcpu->arch.tsc_catchup = 1;
1815                 vcpu->arch.tsc_always_catchup = 1;
1816         } else
1817                 WARN(1, "user requested TSC rate below hardware speed\n");
1818 }
1819
1820 /*
1821  * writes 'offset' into guest's timestamp counter offset register
1822  */
1823 static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1824 {
1825         if (is_guest_mode(vcpu)) {
1826                 /*
1827                  * We're here if L1 chose not to trap WRMSR to TSC. According
1828                  * to the spec, this should set L1's TSC; The offset that L1
1829                  * set for L2 remains unchanged, and still needs to be added
1830                  * to the newly set TSC to get L2's TSC.
1831                  */
1832                 struct vmcs12 *vmcs12;
1833                 to_vmx(vcpu)->nested.vmcs01_tsc_offset = offset;
1834                 /* recalculate vmcs02.TSC_OFFSET: */
1835                 vmcs12 = get_vmcs12(vcpu);
1836                 vmcs_write64(TSC_OFFSET, offset +
1837                         (nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ?
1838                          vmcs12->tsc_offset : 0));
1839         } else {
1840                 vmcs_write64(TSC_OFFSET, offset);
1841         }
1842 }
1843
1844 static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment, bool host)
1845 {
1846         u64 offset = vmcs_read64(TSC_OFFSET);
1847         vmcs_write64(TSC_OFFSET, offset + adjustment);
1848         if (is_guest_mode(vcpu)) {
1849                 /* Even when running L2, the adjustment needs to apply to L1 */
1850                 to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment;
1851         }
1852 }
1853
1854 static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
1855 {
1856         return target_tsc - native_read_tsc();
1857 }
1858
1859 static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu)
1860 {
1861         struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 1, 0);
1862         return best && (best->ecx & (1 << (X86_FEATURE_VMX & 31)));
1863 }
1864
1865 /*
1866  * nested_vmx_allowed() checks whether a guest should be allowed to use VMX
1867  * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for
1868  * all guests if the "nested" module option is off, and can also be disabled
1869  * for a single guest by disabling its VMX cpuid bit.
1870  */
1871 static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu)
1872 {
1873         return nested && guest_cpuid_has_vmx(vcpu);
1874 }
1875
1876 /*
1877  * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
1878  * returned for the various VMX controls MSRs when nested VMX is enabled.
1879  * The same values should also be used to verify that vmcs12 control fields are
1880  * valid during nested entry from L1 to L2.
1881  * Each of these control msrs has a low and high 32-bit half: A low bit is on
1882  * if the corresponding bit in the (32-bit) control field *must* be on, and a
1883  * bit in the high half is on if the corresponding bit in the control field
1884  * may be on. See also vmx_control_verify().
1885  * TODO: allow these variables to be modified (downgraded) by module options
1886  * or other means.
1887  */
1888 static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high;
1889 static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high;
1890 static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high;
1891 static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high;
1892 static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high;
1893 static __init void nested_vmx_setup_ctls_msrs(void)
1894 {
1895         /*
1896          * Note that as a general rule, the high half of the MSRs (bits in
1897          * the control fields which may be 1) should be initialized by the
1898          * intersection of the underlying hardware's MSR (i.e., features which
1899          * can be supported) and the list of features we want to expose -
1900          * because they are known to be properly supported in our code.
1901          * Also, usually, the low half of the MSRs (bits which must be 1) can
1902          * be set to 0, meaning that L1 may turn off any of these bits. The
1903          * reason is that if one of these bits is necessary, it will appear
1904          * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
1905          * fields of vmcs01 and vmcs02, will turn these bits off - and
1906          * nested_vmx_exit_handled() will not pass related exits to L1.
1907          * These rules have exceptions below.
1908          */
1909
1910         /* pin-based controls */
1911         /*
1912          * According to the Intel spec, if bit 55 of VMX_BASIC is off (as it is
1913          * in our case), bits 1, 2 and 4 (i.e., 0x16) must be 1 in this MSR.
1914          */
1915         nested_vmx_pinbased_ctls_low = 0x16 ;
1916         nested_vmx_pinbased_ctls_high = 0x16 |
1917                 PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING |
1918                 PIN_BASED_VIRTUAL_NMIS;
1919
1920         /* exit controls */
1921         nested_vmx_exit_ctls_low = 0;
1922         /* Note that guest use of VM_EXIT_ACK_INTR_ON_EXIT is not supported. */
1923 #ifdef CONFIG_X86_64
1924         nested_vmx_exit_ctls_high = VM_EXIT_HOST_ADDR_SPACE_SIZE;
1925 #else
1926         nested_vmx_exit_ctls_high = 0;
1927 #endif
1928
1929         /* entry controls */
1930         rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
1931                 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high);
1932         nested_vmx_entry_ctls_low = 0;
1933         nested_vmx_entry_ctls_high &=
1934                 VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_IA32E_MODE;
1935
1936         /* cpu-based controls */
1937         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
1938                 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high);
1939         nested_vmx_procbased_ctls_low = 0;
1940         nested_vmx_procbased_ctls_high &=
1941                 CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_USE_TSC_OFFSETING |
1942                 CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
1943                 CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
1944                 CPU_BASED_CR3_STORE_EXITING |
1945 #ifdef CONFIG_X86_64
1946                 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
1947 #endif
1948                 CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
1949                 CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING |
1950                 CPU_BASED_RDPMC_EXITING |
1951                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1952         /*
1953          * We can allow some features even when not supported by the
1954          * hardware. For example, L1 can specify an MSR bitmap - and we
1955          * can use it to avoid exits to L1 - even when L0 runs L2
1956          * without MSR bitmaps.
1957          */
1958         nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS;
1959
1960         /* secondary cpu-based controls */
1961         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
1962                 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high);
1963         nested_vmx_secondary_ctls_low = 0;
1964         nested_vmx_secondary_ctls_high &=
1965                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
1966 }
1967
1968 static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
1969 {
1970         /*
1971          * Bits 0 in high must be 0, and bits 1 in low must be 1.
1972          */
1973         return ((control & high) | low) == control;
1974 }
1975
1976 static inline u64 vmx_control_msr(u32 low, u32 high)
1977 {
1978         return low | ((u64)high << 32);
1979 }
1980
1981 /*
1982  * If we allow our guest to use VMX instructions (i.e., nested VMX), we should
1983  * also let it use VMX-specific MSRs.
1984  * vmx_get_vmx_msr() and vmx_set_vmx_msr() return 1 when we handled a
1985  * VMX-specific MSR, or 0 when we haven't (and the caller should handle it
1986  * like all other MSRs).
1987  */
1988 static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1989 {
1990         if (!nested_vmx_allowed(vcpu) && msr_index >= MSR_IA32_VMX_BASIC &&
1991                      msr_index <= MSR_IA32_VMX_TRUE_ENTRY_CTLS) {
1992                 /*
1993                  * According to the spec, processors which do not support VMX
1994                  * should throw a #GP(0) when VMX capability MSRs are read.
1995                  */
1996                 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
1997                 return 1;
1998         }
1999
2000         switch (msr_index) {
2001         case MSR_IA32_FEATURE_CONTROL:
2002                 *pdata = 0;
2003                 break;
2004         case MSR_IA32_VMX_BASIC:
2005                 /*
2006                  * This MSR reports some information about VMX support. We
2007                  * should return information about the VMX we emulate for the
2008                  * guest, and the VMCS structure we give it - not about the
2009                  * VMX support of the underlying hardware.
2010                  */
2011                 *pdata = VMCS12_REVISION |
2012                            ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
2013                            (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
2014                 break;
2015         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
2016         case MSR_IA32_VMX_PINBASED_CTLS:
2017                 *pdata = vmx_control_msr(nested_vmx_pinbased_ctls_low,
2018                                         nested_vmx_pinbased_ctls_high);
2019                 break;
2020         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
2021         case MSR_IA32_VMX_PROCBASED_CTLS:
2022                 *pdata = vmx_control_msr(nested_vmx_procbased_ctls_low,
2023                                         nested_vmx_procbased_ctls_high);
2024                 break;
2025         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
2026         case MSR_IA32_VMX_EXIT_CTLS:
2027                 *pdata = vmx_control_msr(nested_vmx_exit_ctls_low,
2028                                         nested_vmx_exit_ctls_high);
2029                 break;
2030         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
2031         case MSR_IA32_VMX_ENTRY_CTLS:
2032                 *pdata = vmx_control_msr(nested_vmx_entry_ctls_low,
2033                                         nested_vmx_entry_ctls_high);
2034                 break;
2035         case MSR_IA32_VMX_MISC:
2036                 *pdata = 0;
2037                 break;
2038         /*
2039          * These MSRs specify bits which the guest must keep fixed (on or off)
2040          * while L1 is in VMXON mode (in L1's root mode, or running an L2).
2041          * We picked the standard core2 setting.
2042          */
2043 #define VMXON_CR0_ALWAYSON      (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
2044 #define VMXON_CR4_ALWAYSON      X86_CR4_VMXE
2045         case MSR_IA32_VMX_CR0_FIXED0:
2046                 *pdata = VMXON_CR0_ALWAYSON;
2047                 break;
2048         case MSR_IA32_VMX_CR0_FIXED1:
2049                 *pdata = -1ULL;
2050                 break;
2051         case MSR_IA32_VMX_CR4_FIXED0:
2052                 *pdata = VMXON_CR4_ALWAYSON;
2053                 break;
2054         case MSR_IA32_VMX_CR4_FIXED1:
2055                 *pdata = -1ULL;
2056                 break;
2057         case MSR_IA32_VMX_VMCS_ENUM:
2058                 *pdata = 0x1f;
2059                 break;
2060         case MSR_IA32_VMX_PROCBASED_CTLS2:
2061                 *pdata = vmx_control_msr(nested_vmx_secondary_ctls_low,
2062                                         nested_vmx_secondary_ctls_high);
2063                 break;
2064         case MSR_IA32_VMX_EPT_VPID_CAP:
2065                 /* Currently, no nested ept or nested vpid */
2066                 *pdata = 0;
2067                 break;
2068         default:
2069                 return 0;
2070         }
2071
2072         return 1;
2073 }
2074
2075 static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
2076 {
2077         if (!nested_vmx_allowed(vcpu))
2078                 return 0;
2079
2080         if (msr_index == MSR_IA32_FEATURE_CONTROL)
2081                 /* TODO: the right thing. */
2082                 return 1;
2083         /*
2084          * No need to treat VMX capability MSRs specially: If we don't handle
2085          * them, handle_wrmsr will #GP(0), which is correct (they are readonly)
2086          */
2087         return 0;
2088 }
2089
2090 /*
2091  * Reads an msr value (of 'msr_index') into 'pdata'.
2092  * Returns 0 on success, non-0 otherwise.
2093  * Assumes vcpu_load() was already called.
2094  */
2095 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
2096 {
2097         u64 data;
2098         struct shared_msr_entry *msr;
2099
2100         if (!pdata) {
2101                 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
2102                 return -EINVAL;
2103         }
2104
2105         switch (msr_index) {
2106 #ifdef CONFIG_X86_64
2107         case MSR_FS_BASE:
2108                 data = vmcs_readl(GUEST_FS_BASE);
2109                 break;
2110         case MSR_GS_BASE:
2111                 data = vmcs_readl(GUEST_GS_BASE);
2112                 break;
2113         case MSR_KERNEL_GS_BASE:
2114                 vmx_load_host_state(to_vmx(vcpu));
2115                 data = to_vmx(vcpu)->msr_guest_kernel_gs_base;
2116                 break;
2117 #endif
2118         case MSR_EFER:
2119                 return kvm_get_msr_common(vcpu, msr_index, pdata);
2120         case MSR_IA32_TSC:
2121                 data = guest_read_tsc();
2122                 break;
2123         case MSR_IA32_SYSENTER_CS:
2124                 data = vmcs_read32(GUEST_SYSENTER_CS);
2125                 break;
2126         case MSR_IA32_SYSENTER_EIP:
2127                 data = vmcs_readl(GUEST_SYSENTER_EIP);
2128                 break;
2129         case MSR_IA32_SYSENTER_ESP:
2130                 data = vmcs_readl(GUEST_SYSENTER_ESP);
2131                 break;
2132         case MSR_TSC_AUX:
2133                 if (!to_vmx(vcpu)->rdtscp_enabled)
2134                         return 1;
2135                 /* Otherwise falls through */
2136         default:
2137                 if (vmx_get_vmx_msr(vcpu, msr_index, pdata))
2138                         return 0;
2139                 msr = find_msr_entry(to_vmx(vcpu), msr_index);
2140                 if (msr) {
2141                         data = msr->data;
2142                         break;
2143                 }
2144                 return kvm_get_msr_common(vcpu, msr_index, pdata);
2145         }
2146
2147         *pdata = data;
2148         return 0;
2149 }
2150
2151 /*
2152  * Writes msr value into into the appropriate "register".
2153  * Returns 0 on success, non-0 otherwise.
2154  * Assumes vcpu_load() was already called.
2155  */
2156 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
2157 {
2158         struct vcpu_vmx *vmx = to_vmx(vcpu);
2159         struct shared_msr_entry *msr;
2160         int ret = 0;
2161
2162         switch (msr_index) {
2163         case MSR_EFER:
2164                 ret = kvm_set_msr_common(vcpu, msr_index, data);
2165                 break;
2166 #ifdef CONFIG_X86_64
2167         case MSR_FS_BASE:
2168                 vmx_segment_cache_clear(vmx);
2169                 vmcs_writel(GUEST_FS_BASE, data);
2170                 break;
2171         case MSR_GS_BASE:
2172                 vmx_segment_cache_clear(vmx);
2173                 vmcs_writel(GUEST_GS_BASE, data);
2174                 break;
2175         case MSR_KERNEL_GS_BASE:
2176                 vmx_load_host_state(vmx);
2177                 vmx->msr_guest_kernel_gs_base = data;
2178                 break;
2179 #endif
2180         case MSR_IA32_SYSENTER_CS:
2181                 vmcs_write32(GUEST_SYSENTER_CS, data);
2182                 break;
2183         case MSR_IA32_SYSENTER_EIP:
2184                 vmcs_writel(GUEST_SYSENTER_EIP, data);
2185                 break;
2186         case MSR_IA32_SYSENTER_ESP:
2187                 vmcs_writel(GUEST_SYSENTER_ESP, data);
2188                 break;
2189         case MSR_IA32_TSC:
2190                 kvm_write_tsc(vcpu, data);
2191                 break;
2192         case MSR_IA32_CR_PAT:
2193                 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2194                         vmcs_write64(GUEST_IA32_PAT, data);
2195                         vcpu->arch.pat = data;
2196                         break;
2197                 }
2198                 ret = kvm_set_msr_common(vcpu, msr_index, data);
2199                 break;
2200         case MSR_TSC_AUX:
2201                 if (!vmx->rdtscp_enabled)
2202                         return 1;
2203                 /* Check reserved bit, higher 32 bits should be zero */
2204                 if ((data >> 32) != 0)
2205                         return 1;
2206                 /* Otherwise falls through */
2207         default:
2208                 if (vmx_set_vmx_msr(vcpu, msr_index, data))
2209                         break;
2210                 msr = find_msr_entry(vmx, msr_index);
2211                 if (msr) {
2212                         msr->data = data;
2213                         if (msr - vmx->guest_msrs < vmx->save_nmsrs) {
2214                                 preempt_disable();
2215                                 kvm_set_shared_msr(msr->index, msr->data,
2216                                                    msr->mask);
2217                                 preempt_enable();
2218                         }
2219                         break;
2220                 }
2221                 ret = kvm_set_msr_common(vcpu, msr_index, data);
2222         }
2223
2224         return ret;
2225 }
2226
2227 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
2228 {
2229         __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
2230         switch (reg) {
2231         case VCPU_REGS_RSP:
2232                 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
2233                 break;
2234         case VCPU_REGS_RIP:
2235                 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
2236                 break;
2237         case VCPU_EXREG_PDPTR:
2238                 if (enable_ept)
2239                         ept_save_pdptrs(vcpu);
2240                 break;
2241         default:
2242                 break;
2243         }
2244 }
2245
2246 static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
2247 {
2248         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
2249                 vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
2250         else
2251                 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2252
2253         update_exception_bitmap(vcpu);
2254 }
2255
2256 static __init int cpu_has_kvm_support(void)
2257 {
2258         return cpu_has_vmx();
2259 }
2260
2261 static __init int vmx_disabled_by_bios(void)
2262 {
2263         u64 msr;
2264
2265         rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
2266         if (msr & FEATURE_CONTROL_LOCKED) {
2267                 /* launched w/ TXT and VMX disabled */
2268                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
2269                         && tboot_enabled())
2270                         return 1;
2271                 /* launched w/o TXT and VMX only enabled w/ TXT */
2272                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
2273                         && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
2274                         && !tboot_enabled()) {
2275                         printk(KERN_WARNING "kvm: disable TXT in the BIOS or "
2276                                 "activate TXT before enabling KVM\n");
2277                         return 1;
2278                 }
2279                 /* launched w/o TXT and VMX disabled */
2280                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
2281                         && !tboot_enabled())
2282                         return 1;
2283         }
2284
2285         return 0;
2286 }
2287
2288 static void kvm_cpu_vmxon(u64 addr)
2289 {
2290         asm volatile (ASM_VMX_VMXON_RAX
2291                         : : "a"(&addr), "m"(addr)
2292                         : "memory", "cc");
2293 }
2294
2295 static int hardware_enable(void *garbage)
2296 {
2297         int cpu = raw_smp_processor_id();
2298         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
2299         u64 old, test_bits;
2300
2301         if (read_cr4() & X86_CR4_VMXE)
2302                 return -EBUSY;
2303
2304         INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
2305         rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
2306
2307         test_bits = FEATURE_CONTROL_LOCKED;
2308         test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
2309         if (tboot_enabled())
2310                 test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX;
2311
2312         if ((old & test_bits) != test_bits) {
2313                 /* enable and lock */
2314                 wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits);
2315         }
2316         write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
2317
2318         if (vmm_exclusive) {
2319                 kvm_cpu_vmxon(phys_addr);
2320                 ept_sync_global();
2321         }
2322
2323         store_gdt(&__get_cpu_var(host_gdt));
2324
2325         return 0;
2326 }
2327
2328 static void vmclear_local_loaded_vmcss(void)
2329 {
2330         int cpu = raw_smp_processor_id();
2331         struct loaded_vmcs *v, *n;
2332
2333         list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu),
2334                                  loaded_vmcss_on_cpu_link)
2335                 __loaded_vmcs_clear(v);
2336 }
2337
2338
2339 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
2340  * tricks.
2341  */
2342 static void kvm_cpu_vmxoff(void)
2343 {
2344         asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
2345 }
2346
2347 static void hardware_disable(void *garbage)
2348 {
2349         if (vmm_exclusive) {
2350                 vmclear_local_loaded_vmcss();
2351                 kvm_cpu_vmxoff();
2352         }
2353         write_cr4(read_cr4() & ~X86_CR4_VMXE);
2354 }
2355
2356 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
2357                                       u32 msr, u32 *result)
2358 {
2359         u32 vmx_msr_low, vmx_msr_high;
2360         u32 ctl = ctl_min | ctl_opt;
2361
2362         rdmsr(msr, vmx_msr_low, vmx_msr_high);
2363
2364         ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
2365         ctl |= vmx_msr_low;  /* bit == 1 in low word  ==> must be one  */
2366
2367         /* Ensure minimum (required) set of control bits are supported. */
2368         if (ctl_min & ~ctl)
2369                 return -EIO;
2370
2371         *result = ctl;
2372         return 0;
2373 }
2374
2375 static __init bool allow_1_setting(u32 msr, u32 ctl)
2376 {
2377         u32 vmx_msr_low, vmx_msr_high;
2378
2379         rdmsr(msr, vmx_msr_low, vmx_msr_high);
2380         return vmx_msr_high & ctl;
2381 }
2382
2383 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
2384 {
2385         u32 vmx_msr_low, vmx_msr_high;
2386         u32 min, opt, min2, opt2;
2387         u32 _pin_based_exec_control = 0;
2388         u32 _cpu_based_exec_control = 0;
2389         u32 _cpu_based_2nd_exec_control = 0;
2390         u32 _vmexit_control = 0;
2391         u32 _vmentry_control = 0;
2392
2393         min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
2394         opt = PIN_BASED_VIRTUAL_NMIS;
2395         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
2396                                 &_pin_based_exec_control) < 0)
2397                 return -EIO;
2398
2399         min = CPU_BASED_HLT_EXITING |
2400 #ifdef CONFIG_X86_64
2401               CPU_BASED_CR8_LOAD_EXITING |
2402               CPU_BASED_CR8_STORE_EXITING |
2403 #endif
2404               CPU_BASED_CR3_LOAD_EXITING |
2405               CPU_BASED_CR3_STORE_EXITING |
2406               CPU_BASED_USE_IO_BITMAPS |
2407               CPU_BASED_MOV_DR_EXITING |
2408               CPU_BASED_USE_TSC_OFFSETING |
2409               CPU_BASED_MWAIT_EXITING |
2410               CPU_BASED_MONITOR_EXITING |
2411               CPU_BASED_INVLPG_EXITING |
2412               CPU_BASED_RDPMC_EXITING;
2413
2414         opt = CPU_BASED_TPR_SHADOW |
2415               CPU_BASED_USE_MSR_BITMAPS |
2416               CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
2417         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
2418                                 &_cpu_based_exec_control) < 0)
2419                 return -EIO;
2420 #ifdef CONFIG_X86_64
2421         if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
2422                 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
2423                                            ~CPU_BASED_CR8_STORE_EXITING;
2424 #endif
2425         if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
2426                 min2 = 0;
2427                 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
2428                         SECONDARY_EXEC_WBINVD_EXITING |
2429                         SECONDARY_EXEC_ENABLE_VPID |
2430                         SECONDARY_EXEC_ENABLE_EPT |
2431                         SECONDARY_EXEC_UNRESTRICTED_GUEST |
2432                         SECONDARY_EXEC_PAUSE_LOOP_EXITING |
2433                         SECONDARY_EXEC_RDTSCP;
2434                 if (adjust_vmx_controls(min2, opt2,
2435                                         MSR_IA32_VMX_PROCBASED_CTLS2,
2436                                         &_cpu_based_2nd_exec_control) < 0)
2437                         return -EIO;
2438         }
2439 #ifndef CONFIG_X86_64
2440         if (!(_cpu_based_2nd_exec_control &
2441                                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
2442                 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
2443 #endif
2444         if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
2445                 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
2446                    enabled */
2447                 _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
2448                                              CPU_BASED_CR3_STORE_EXITING |
2449                                              CPU_BASED_INVLPG_EXITING);
2450                 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
2451                       vmx_capability.ept, vmx_capability.vpid);
2452         }
2453
2454         min = 0;
2455 #ifdef CONFIG_X86_64
2456         min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
2457 #endif
2458         opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
2459         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
2460                                 &_vmexit_control) < 0)
2461                 return -EIO;
2462
2463         min = 0;
2464         opt = VM_ENTRY_LOAD_IA32_PAT;
2465         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
2466                                 &_vmentry_control) < 0)
2467                 return -EIO;
2468
2469         rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
2470
2471         /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
2472         if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
2473                 return -EIO;
2474
2475 #ifdef CONFIG_X86_64
2476         /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
2477         if (vmx_msr_high & (1u<<16))
2478                 return -EIO;
2479 #endif
2480
2481         /* Require Write-Back (WB) memory type for VMCS accesses. */
2482         if (((vmx_msr_high >> 18) & 15) != 6)
2483                 return -EIO;
2484
2485         vmcs_conf->size = vmx_msr_high & 0x1fff;
2486         vmcs_conf->order = get_order(vmcs_config.size);
2487         vmcs_conf->revision_id = vmx_msr_low;
2488
2489         vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
2490         vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
2491         vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
2492         vmcs_conf->vmexit_ctrl         = _vmexit_control;
2493         vmcs_conf->vmentry_ctrl        = _vmentry_control;
2494
2495         cpu_has_load_ia32_efer =
2496                 allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
2497                                 VM_ENTRY_LOAD_IA32_EFER)
2498                 && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
2499                                    VM_EXIT_LOAD_IA32_EFER);
2500
2501         cpu_has_load_perf_global_ctrl =
2502                 allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
2503                                 VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
2504                 && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
2505                                    VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
2506
2507         /*
2508          * Some cpus support VM_ENTRY_(LOAD|SAVE)_IA32_PERF_GLOBAL_CTRL
2509          * but due to arrata below it can't be used. Workaround is to use
2510          * msr load mechanism to switch IA32_PERF_GLOBAL_CTRL.
2511          *
2512          * VM Exit May Incorrectly Clear IA32_PERF_GLOBAL_CTRL [34:32]
2513          *
2514          * AAK155             (model 26)
2515          * AAP115             (model 30)
2516          * AAT100             (model 37)
2517          * BC86,AAY89,BD102   (model 44)
2518          * BA97               (model 46)
2519          *
2520          */
2521         if (cpu_has_load_perf_global_ctrl && boot_cpu_data.x86 == 0x6) {
2522                 switch (boot_cpu_data.x86_model) {
2523                 case 26:
2524                 case 30:
2525                 case 37:
2526                 case 44:
2527                 case 46:
2528                         cpu_has_load_perf_global_ctrl = false;
2529                         printk_once(KERN_WARNING"kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL "
2530                                         "does not work properly. Using workaround\n");
2531                         break;
2532                 default:
2533                         break;
2534                 }
2535         }
2536
2537         return 0;
2538 }
2539
2540 static struct vmcs *alloc_vmcs_cpu(int cpu)
2541 {
2542         int node = cpu_to_node(cpu);
2543         struct page *pages;
2544         struct vmcs *vmcs;
2545
2546         pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
2547         if (!pages)
2548                 return NULL;
2549         vmcs = page_address(pages);
2550         memset(vmcs, 0, vmcs_config.size);
2551         vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
2552         return vmcs;
2553 }
2554
2555 static struct vmcs *alloc_vmcs(void)
2556 {
2557         return alloc_vmcs_cpu(raw_smp_processor_id());
2558 }
2559
2560 static void free_vmcs(struct vmcs *vmcs)
2561 {
2562         free_pages((unsigned long)vmcs, vmcs_config.order);
2563 }
2564
2565 /*
2566  * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded
2567  */
2568 static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
2569 {
2570         if (!loaded_vmcs->vmcs)
2571                 return;
2572         loaded_vmcs_clear(loaded_vmcs);
2573         free_vmcs(loaded_vmcs->vmcs);
2574         loaded_vmcs->vmcs = NULL;
2575 }
2576
2577 static void free_kvm_area(void)
2578 {
2579         int cpu;
2580
2581         for_each_possible_cpu(cpu) {
2582                 free_vmcs(per_cpu(vmxarea, cpu));
2583                 per_cpu(vmxarea, cpu) = NULL;
2584         }
2585 }
2586
2587 static __init int alloc_kvm_area(void)
2588 {
2589         int cpu;
2590
2591         for_each_possible_cpu(cpu) {
2592                 struct vmcs *vmcs;
2593
2594                 vmcs = alloc_vmcs_cpu(cpu);
2595                 if (!vmcs) {
2596                         free_kvm_area();
2597                         return -ENOMEM;
2598                 }
2599
2600                 per_cpu(vmxarea, cpu) = vmcs;
2601         }
2602         return 0;
2603 }
2604
2605 static __init int hardware_setup(void)
2606 {
2607         if (setup_vmcs_config(&vmcs_config) < 0)
2608                 return -EIO;
2609
2610         if (boot_cpu_has(X86_FEATURE_NX))
2611                 kvm_enable_efer_bits(EFER_NX);
2612
2613         if (!cpu_has_vmx_vpid())
2614                 enable_vpid = 0;
2615
2616         if (!cpu_has_vmx_ept() ||
2617             !cpu_has_vmx_ept_4levels()) {
2618                 enable_ept = 0;
2619                 enable_unrestricted_guest = 0;
2620         }
2621
2622         if (!cpu_has_vmx_unrestricted_guest())
2623                 enable_unrestricted_guest = 0;
2624
2625         if (!cpu_has_vmx_flexpriority())
2626                 flexpriority_enabled = 0;
2627
2628         if (!cpu_has_vmx_tpr_shadow())
2629                 kvm_x86_ops->update_cr8_intercept = NULL;
2630
2631         if (enable_ept && !cpu_has_vmx_ept_2m_page())
2632                 kvm_disable_largepages();
2633
2634         if (!cpu_has_vmx_ple())
2635                 ple_gap = 0;
2636
2637         if (nested)
2638                 nested_vmx_setup_ctls_msrs();
2639
2640         return alloc_kvm_area();
2641 }
2642
2643 static __exit void hardware_unsetup(void)
2644 {
2645         free_kvm_area();
2646 }
2647
2648 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
2649 {
2650         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2651
2652         if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
2653                 vmcs_write16(sf->selector, save->selector);
2654                 vmcs_writel(sf->base, save->base);
2655                 vmcs_write32(sf->limit, save->limit);
2656                 vmcs_write32(sf->ar_bytes, save->ar);
2657         } else {
2658                 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
2659                         << AR_DPL_SHIFT;
2660                 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
2661         }
2662 }
2663
2664 static void enter_pmode(struct kvm_vcpu *vcpu)
2665 {
2666         unsigned long flags;
2667         struct vcpu_vmx *vmx = to_vmx(vcpu);
2668
2669         vmx->emulation_required = 1;
2670         vmx->rmode.vm86_active = 0;
2671
2672         vmx_segment_cache_clear(vmx);
2673
2674         vmcs_write16(GUEST_TR_SELECTOR, vmx->rmode.tr.selector);
2675         vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base);
2676         vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit);
2677         vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar);
2678
2679         flags = vmcs_readl(GUEST_RFLAGS);
2680         flags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
2681         flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
2682         vmcs_writel(GUEST_RFLAGS, flags);
2683
2684         vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
2685                         (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
2686
2687         update_exception_bitmap(vcpu);
2688
2689         if (emulate_invalid_guest_state)
2690                 return;
2691
2692         fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es);
2693         fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds);
2694         fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs);
2695         fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs);
2696
2697         vmx_segment_cache_clear(vmx);
2698
2699         vmcs_write16(GUEST_SS_SELECTOR, 0);
2700         vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
2701
2702         vmcs_write16(GUEST_CS_SELECTOR,
2703                      vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
2704         vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
2705 }
2706
2707 static gva_t rmode_tss_base(struct kvm *kvm)
2708 {
2709         if (!kvm->arch.tss_addr) {
2710                 struct kvm_memslots *slots;
2711                 struct kvm_memory_slot *slot;
2712                 gfn_t base_gfn;
2713
2714                 slots = kvm_memslots(kvm);
2715                 slot = id_to_memslot(slots, 0);
2716                 base_gfn = slot->base_gfn + slot->npages - 3;
2717
2718                 return base_gfn << PAGE_SHIFT;
2719         }
2720         return kvm->arch.tss_addr;
2721 }
2722
2723 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
2724 {
2725         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2726
2727         save->selector = vmcs_read16(sf->selector);
2728         save->base = vmcs_readl(sf->base);
2729         save->limit = vmcs_read32(sf->limit);
2730         save->ar = vmcs_read32(sf->ar_bytes);
2731         vmcs_write16(sf->selector, save->base >> 4);
2732         vmcs_write32(sf->base, save->base & 0xffff0);
2733         vmcs_write32(sf->limit, 0xffff);
2734         vmcs_write32(sf->ar_bytes, 0xf3);
2735         if (save->base & 0xf)
2736                 printk_once(KERN_WARNING "kvm: segment base is not paragraph"
2737                             " aligned when entering protected mode (seg=%d)",
2738                             seg);
2739 }
2740
2741 static void enter_rmode(struct kvm_vcpu *vcpu)
2742 {
2743         unsigned long flags;
2744         struct vcpu_vmx *vmx = to_vmx(vcpu);
2745
2746         if (enable_unrestricted_guest)
2747                 return;
2748
2749         vmx->emulation_required = 1;
2750         vmx->rmode.vm86_active = 1;
2751
2752         /*
2753          * Very old userspace does not call KVM_SET_TSS_ADDR before entering
2754          * vcpu. Call it here with phys address pointing 16M below 4G.
2755          */
2756         if (!vcpu->kvm->arch.tss_addr) {
2757                 printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be "
2758                              "called before entering vcpu\n");
2759                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
2760                 vmx_set_tss_addr(vcpu->kvm, 0xfeffd000);
2761                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2762         }
2763
2764         vmx_segment_cache_clear(vmx);
2765
2766         vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR);
2767         vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
2768         vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
2769
2770         vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
2771         vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
2772
2773         vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
2774         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2775
2776         flags = vmcs_readl(GUEST_RFLAGS);
2777         vmx->rmode.save_rflags = flags;
2778
2779         flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
2780
2781         vmcs_writel(GUEST_RFLAGS, flags);
2782         vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
2783         update_exception_bitmap(vcpu);
2784
2785         if (emulate_invalid_guest_state)
2786                 goto continue_rmode;
2787
2788         vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
2789         vmcs_write32(GUEST_SS_LIMIT, 0xffff);
2790         vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
2791
2792         vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
2793         vmcs_write32(GUEST_CS_LIMIT, 0xffff);
2794         if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
2795                 vmcs_writel(GUEST_CS_BASE, 0xf0000);
2796         vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
2797
2798         fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
2799         fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
2800         fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
2801         fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
2802
2803 continue_rmode:
2804         kvm_mmu_reset_context(vcpu);
2805 }
2806
2807 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
2808 {
2809         struct vcpu_vmx *vmx = to_vmx(vcpu);
2810         struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
2811
2812         if (!msr)
2813                 return;
2814
2815         /*
2816          * Force kernel_gs_base reloading before EFER changes, as control
2817          * of this msr depends on is_long_mode().
2818          */
2819         vmx_load_host_state(to_vmx(vcpu));
2820         vcpu->arch.efer = efer;
2821         if (efer & EFER_LMA) {
2822                 vmcs_write32(VM_ENTRY_CONTROLS,
2823                              vmcs_read32(VM_ENTRY_CONTROLS) |
2824                              VM_ENTRY_IA32E_MODE);
2825                 msr->data = efer;
2826         } else {
2827                 vmcs_write32(VM_ENTRY_CONTROLS,
2828                              vmcs_read32(VM_ENTRY_CONTROLS) &
2829                              ~VM_ENTRY_IA32E_MODE);
2830
2831                 msr->data = efer & ~EFER_LME;
2832         }
2833         setup_msrs(vmx);
2834 }
2835
2836 #ifdef CONFIG_X86_64
2837
2838 static void enter_lmode(struct kvm_vcpu *vcpu)
2839 {
2840         u32 guest_tr_ar;
2841
2842         vmx_segment_cache_clear(to_vmx(vcpu));
2843
2844         guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
2845         if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
2846                 pr_debug_ratelimited("%s: tss fixup for long mode. \n",
2847                                      __func__);
2848                 vmcs_write32(GUEST_TR_AR_BYTES,
2849                              (guest_tr_ar & ~AR_TYPE_MASK)
2850                              | AR_TYPE_BUSY_64_TSS);
2851         }
2852         vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
2853 }
2854
2855 static void exit_lmode(struct kvm_vcpu *vcpu)
2856 {
2857         vmcs_write32(VM_ENTRY_CONTROLS,
2858                      vmcs_read32(VM_ENTRY_CONTROLS)
2859                      & ~VM_ENTRY_IA32E_MODE);
2860         vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
2861 }
2862
2863 #endif
2864
2865 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
2866 {
2867         vpid_sync_context(to_vmx(vcpu));
2868         if (enable_ept) {
2869                 if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
2870                         return;
2871                 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
2872         }
2873 }
2874
2875 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
2876 {
2877         ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits;
2878
2879         vcpu->arch.cr0 &= ~cr0_guest_owned_bits;
2880         vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits;
2881 }
2882
2883 static void vmx_decache_cr3(struct kvm_vcpu *vcpu)
2884 {
2885         if (enable_ept && is_paging(vcpu))
2886                 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
2887         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
2888 }
2889
2890 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
2891 {
2892         ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;
2893
2894         vcpu->arch.cr4 &= ~cr4_guest_owned_bits;
2895         vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits;
2896 }
2897
2898 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
2899 {
2900         if (!test_bit(VCPU_EXREG_PDPTR,
2901                       (unsigned long *)&vcpu->arch.regs_dirty))
2902                 return;
2903
2904         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
2905                 vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]);
2906                 vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]);
2907                 vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]);
2908                 vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]);
2909         }
2910 }
2911
2912 static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
2913 {
2914         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
2915                 vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
2916                 vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
2917                 vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
2918                 vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
2919         }
2920
2921         __set_bit(VCPU_EXREG_PDPTR,
2922                   (unsigned long *)&vcpu->arch.regs_avail);
2923         __set_bit(VCPU_EXREG_PDPTR,
2924                   (unsigned long *)&vcpu->arch.regs_dirty);
2925 }
2926
2927 static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
2928
2929 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
2930                                         unsigned long cr0,
2931                                         struct kvm_vcpu *vcpu)
2932 {
2933         if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
2934                 vmx_decache_cr3(vcpu);
2935         if (!(cr0 & X86_CR0_PG)) {
2936                 /* From paging/starting to nonpaging */
2937                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
2938                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
2939                              (CPU_BASED_CR3_LOAD_EXITING |
2940                               CPU_BASED_CR3_STORE_EXITING));
2941                 vcpu->arch.cr0 = cr0;
2942                 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
2943         } else if (!is_paging(vcpu)) {
2944                 /* From nonpaging to paging */
2945                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
2946                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
2947                              ~(CPU_BASED_CR3_LOAD_EXITING |
2948                                CPU_BASED_CR3_STORE_EXITING));
2949                 vcpu->arch.cr0 = cr0;
2950                 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
2951         }
2952
2953         if (!(cr0 & X86_CR0_WP))
2954                 *hw_cr0 &= ~X86_CR0_WP;
2955 }
2956
2957 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
2958 {
2959         struct vcpu_vmx *vmx = to_vmx(vcpu);
2960         unsigned long hw_cr0;
2961
2962         if (enable_unrestricted_guest)
2963                 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
2964                         | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
2965         else
2966                 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
2967
2968         if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
2969                 enter_pmode(vcpu);
2970
2971         if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
2972                 enter_rmode(vcpu);
2973
2974 #ifdef CONFIG_X86_64
2975         if (vcpu->arch.efer & EFER_LME) {
2976                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
2977                         enter_lmode(vcpu);
2978                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
2979                         exit_lmode(vcpu);
2980         }
2981 #endif
2982
2983         if (enable_ept)
2984                 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
2985
2986         if (!vcpu->fpu_active)
2987                 hw_cr0 |= X86_CR0_TS | X86_CR0_MP;
2988
2989         vmcs_writel(CR0_READ_SHADOW, cr0);
2990         vmcs_writel(GUEST_CR0, hw_cr0);
2991         vcpu->arch.cr0 = cr0;
2992         __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
2993 }
2994
2995 static u64 construct_eptp(unsigned long root_hpa)
2996 {
2997         u64 eptp;
2998
2999         /* TODO write the value reading from MSR */
3000         eptp = VMX_EPT_DEFAULT_MT |
3001                 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
3002         eptp |= (root_hpa & PAGE_MASK);
3003
3004         return eptp;
3005 }
3006
3007 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
3008 {
3009         unsigned long guest_cr3;
3010         u64 eptp;
3011
3012         guest_cr3 = cr3;
3013         if (enable_ept) {
3014                 eptp = construct_eptp(cr3);
3015                 vmcs_write64(EPT_POINTER, eptp);
3016                 guest_cr3 = is_paging(vcpu) ? kvm_read_cr3(vcpu) :
3017                         vcpu->kvm->arch.ept_identity_map_addr;
3018                 ept_load_pdptrs(vcpu);
3019         }
3020
3021         vmx_flush_tlb(vcpu);
3022         vmcs_writel(GUEST_CR3, guest_cr3);
3023 }
3024
3025 static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
3026 {
3027         unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
3028                     KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
3029
3030         if (cr4 & X86_CR4_VMXE) {
3031                 /*
3032                  * To use VMXON (and later other VMX instructions), a guest
3033                  * must first be able to turn on cr4.VMXE (see handle_vmon()).
3034                  * So basically the check on whether to allow nested VMX
3035                  * is here.
3036                  */
3037                 if (!nested_vmx_allowed(vcpu))
3038                         return 1;
3039         } else if (to_vmx(vcpu)->nested.vmxon)
3040                 return 1;
3041
3042         vcpu->arch.cr4 = cr4;
3043         if (enable_ept) {
3044                 if (!is_paging(vcpu)) {
3045                         hw_cr4 &= ~X86_CR4_PAE;
3046                         hw_cr4 |= X86_CR4_PSE;
3047                 } else if (!(cr4 & X86_CR4_PAE)) {
3048                         hw_cr4 &= ~X86_CR4_PAE;
3049                 }
3050         }
3051
3052         vmcs_writel(CR4_READ_SHADOW, cr4);
3053         vmcs_writel(GUEST_CR4, hw_cr4);
3054         return 0;
3055 }
3056
3057 static void vmx_get_segment(struct kvm_vcpu *vcpu,
3058                             struct kvm_segment *var, int seg)
3059 {
3060         struct vcpu_vmx *vmx = to_vmx(vcpu);
3061         struct kvm_save_segment *save;
3062         u32 ar;
3063
3064         if (vmx->rmode.vm86_active
3065             && (seg == VCPU_SREG_TR || seg == VCPU_SREG_ES
3066                 || seg == VCPU_SREG_DS || seg == VCPU_SREG_FS
3067                 || seg == VCPU_SREG_GS)
3068             && !emulate_invalid_guest_state) {
3069                 switch (seg) {
3070                 case VCPU_SREG_TR: save = &vmx->rmode.tr; break;
3071                 case VCPU_SREG_ES: save = &vmx->rmode.es; break;
3072                 case VCPU_SREG_DS: save = &vmx->rmode.ds; break;
3073                 case VCPU_SREG_FS: save = &vmx->rmode.fs; break;
3074                 case VCPU_SREG_GS: save = &vmx->rmode.gs; break;
3075                 default: BUG();
3076                 }
3077                 var->selector = save->selector;
3078                 var->base = save->base;
3079                 var->limit = save->limit;
3080                 ar = save->ar;
3081                 if (seg == VCPU_SREG_TR
3082                     || var->selector == vmx_read_guest_seg_selector(vmx, seg))
3083                         goto use_saved_rmode_seg;
3084         }
3085         var->base = vmx_read_guest_seg_base(vmx, seg);
3086         var->limit = vmx_read_guest_seg_limit(vmx, seg);
3087         var->selector = vmx_read_guest_seg_selector(vmx, seg);
3088         ar = vmx_read_guest_seg_ar(vmx, seg);
3089 use_saved_rmode_seg:
3090         if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
3091                 ar = 0;
3092         var->type = ar & 15;
3093         var->s = (ar >> 4) & 1;
3094         var->dpl = (ar >> 5) & 3;
3095         var->present = (ar >> 7) & 1;
3096         var->avl = (ar >> 12) & 1;
3097         var->l = (ar >> 13) & 1;
3098         var->db = (ar >> 14) & 1;
3099         var->g = (ar >> 15) & 1;
3100         var->unusable = (ar >> 16) & 1;
3101 }
3102
3103 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
3104 {
3105         struct kvm_segment s;
3106
3107         if (to_vmx(vcpu)->rmode.vm86_active) {
3108                 vmx_get_segment(vcpu, &s, seg);
3109                 return s.base;
3110         }
3111         return vmx_read_guest_seg_base(to_vmx(vcpu), seg);
3112 }
3113
3114 static int __vmx_get_cpl(struct kvm_vcpu *vcpu)
3115 {
3116         if (!is_protmode(vcpu))
3117                 return 0;
3118
3119         if (!is_long_mode(vcpu)
3120             && (kvm_get_rflags(vcpu) & X86_EFLAGS_VM)) /* if virtual 8086 */
3121                 return 3;
3122
3123         return vmx_read_guest_seg_selector(to_vmx(vcpu), VCPU_SREG_CS) & 3;
3124 }
3125
3126 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
3127 {
3128         if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) {
3129                 __set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
3130                 to_vmx(vcpu)->cpl = __vmx_get_cpl(vcpu);
3131         }
3132         return to_vmx(vcpu)->cpl;
3133 }
3134
3135
3136 static u32 vmx_segment_access_rights(struct kvm_segment *var)
3137 {
3138         u32 ar;
3139
3140         if (var->unusable)
3141                 ar = 1 << 16;
3142         else {
3143                 ar = var->type & 15;
3144                 ar |= (var->s & 1) << 4;
3145                 ar |= (var->dpl & 3) << 5;
3146                 ar |= (var->present & 1) << 7;
3147                 ar |= (var->avl & 1) << 12;
3148                 ar |= (var->l & 1) << 13;
3149                 ar |= (var->db & 1) << 14;
3150                 ar |= (var->g & 1) << 15;
3151         }
3152         if (ar == 0) /* a 0 value means unusable */
3153                 ar = AR_UNUSABLE_MASK;
3154
3155         return ar;
3156 }
3157
3158 static void vmx_set_segment(struct kvm_vcpu *vcpu,
3159                             struct kvm_segment *var, int seg)
3160 {
3161         struct vcpu_vmx *vmx = to_vmx(vcpu);
3162         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
3163         u32 ar;
3164
3165         vmx_segment_cache_clear(vmx);
3166
3167         if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
3168                 vmcs_write16(sf->selector, var->selector);
3169                 vmx->rmode.tr.selector = var->selector;
3170                 vmx->rmode.tr.base = var->base;
3171                 vmx->rmode.tr.limit = var->limit;
3172                 vmx->rmode.tr.ar = vmx_segment_access_rights(var);
3173                 return;
3174         }
3175         vmcs_writel(sf->base, var->base);
3176         vmcs_write32(sf->limit, var->limit);
3177         vmcs_write16(sf->selector, var->selector);
3178         if (vmx->rmode.vm86_active && var->s) {
3179                 /*
3180                  * Hack real-mode segments into vm86 compatibility.
3181                  */
3182                 if (var->base == 0xffff0000 && var->selector == 0xf000)
3183                         vmcs_writel(sf->base, 0xf0000);
3184                 ar = 0xf3;
3185         } else
3186                 ar = vmx_segment_access_rights(var);
3187
3188         /*
3189          *   Fix the "Accessed" bit in AR field of segment registers for older
3190          * qemu binaries.
3191          *   IA32 arch specifies that at the time of processor reset the
3192          * "Accessed" bit in the AR field of segment registers is 1. And qemu
3193          * is setting it to 0 in the usedland code. This causes invalid guest
3194          * state vmexit when "unrestricted guest" mode is turned on.
3195          *    Fix for this setup issue in cpu_reset is being pushed in the qemu
3196          * tree. Newer qemu binaries with that qemu fix would not need this
3197          * kvm hack.
3198          */
3199         if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
3200                 ar |= 0x1; /* Accessed */
3201
3202         vmcs_write32(sf->ar_bytes, ar);
3203         __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
3204 }
3205
3206 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3207 {
3208         u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS);
3209
3210         *db = (ar >> 14) & 1;
3211         *l = (ar >> 13) & 1;
3212 }
3213
3214 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3215 {
3216         dt->size = vmcs_read32(GUEST_IDTR_LIMIT);
3217         dt->address = vmcs_readl(GUEST_IDTR_BASE);
3218 }
3219
3220 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3221 {
3222         vmcs_write32(GUEST_IDTR_LIMIT, dt->size);
3223         vmcs_writel(GUEST_IDTR_BASE, dt->address);
3224 }
3225
3226 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3227 {
3228         dt->size = vmcs_read32(GUEST_GDTR_LIMIT);
3229         dt->address = vmcs_readl(GUEST_GDTR_BASE);
3230 }
3231
3232 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3233 {
3234         vmcs_write32(GUEST_GDTR_LIMIT, dt->size);
3235         vmcs_writel(GUEST_GDTR_BASE, dt->address);
3236 }
3237
3238 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
3239 {
3240         struct kvm_segment var;
3241         u32 ar;
3242
3243         vmx_get_segment(vcpu, &var, seg);
3244         ar = vmx_segment_access_rights(&var);
3245
3246         if (var.base != (var.selector << 4))
3247                 return false;
3248         if (var.limit != 0xffff)
3249                 return false;
3250         if (ar != 0xf3)
3251                 return false;
3252
3253         return true;
3254 }
3255
3256 static bool code_segment_valid(struct kvm_vcpu *vcpu)
3257 {
3258         struct kvm_segment cs;
3259         unsigned int cs_rpl;
3260
3261         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
3262         cs_rpl = cs.selector & SELECTOR_RPL_MASK;
3263
3264         if (cs.unusable)
3265                 return false;
3266         if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
3267                 return false;
3268         if (!cs.s)
3269                 return false;
3270         if (cs.type & AR_TYPE_WRITEABLE_MASK) {
3271                 if (cs.dpl > cs_rpl)
3272                         return false;
3273         } else {
3274                 if (cs.dpl != cs_rpl)
3275                         return false;
3276         }
3277         if (!cs.present)
3278                 return false;
3279
3280         /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
3281         return true;
3282 }
3283
3284 static bool stack_segment_valid(struct kvm_vcpu *vcpu)
3285 {
3286         struct kvm_segment ss;
3287         unsigned int ss_rpl;
3288
3289         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
3290         ss_rpl = ss.selector & SELECTOR_RPL_MASK;
3291
3292         if (ss.unusable)
3293                 return true;
3294         if (ss.type != 3 && ss.type != 7)
3295                 return false;
3296         if (!ss.s)
3297                 return false;
3298         if (ss.dpl != ss_rpl) /* DPL != RPL */
3299                 return false;
3300         if (!ss.present)
3301                 return false;
3302
3303         return true;
3304 }
3305
3306 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
3307 {
3308         struct kvm_segment var;
3309         unsigned int rpl;
3310
3311         vmx_get_segment(vcpu, &var, seg);
3312         rpl = var.selector & SELECTOR_RPL_MASK;
3313
3314         if (var.unusable)
3315                 return true;
3316         if (!var.s)
3317                 return false;
3318         if (!var.present)
3319                 return false;
3320         if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
3321                 if (var.dpl < rpl) /* DPL < RPL */
3322                         return false;
3323         }
3324
3325         /* TODO: Add other members to kvm_segment_field to allow checking for other access
3326          * rights flags
3327          */
3328         return true;
3329 }
3330
3331 static bool tr_valid(struct kvm_vcpu *vcpu)
3332 {
3333         struct kvm_segment tr;
3334
3335         vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
3336
3337         if (tr.unusable)
3338                 return false;
3339         if (tr.selector & SELECTOR_TI_MASK)     /* TI = 1 */
3340                 return false;
3341         if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
3342                 return false;
3343         if (!tr.present)
3344                 return false;
3345
3346         return true;
3347 }
3348
3349 static bool ldtr_valid(struct kvm_vcpu *vcpu)
3350 {
3351         struct kvm_segment ldtr;
3352
3353         vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
3354
3355         if (ldtr.unusable)
3356                 return true;
3357         if (ldtr.selector & SELECTOR_TI_MASK)   /* TI = 1 */
3358                 return false;
3359         if (ldtr.type != 2)
3360                 return false;
3361         if (!ldtr.present)
3362                 return false;
3363
3364         return true;
3365 }
3366
3367 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
3368 {
3369         struct kvm_segment cs, ss;
3370
3371         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
3372         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
3373
3374         return ((cs.selector & SELECTOR_RPL_MASK) ==
3375                  (ss.selector & SELECTOR_RPL_MASK));
3376 }
3377
3378 /*
3379  * Check if guest state is valid. Returns true if valid, false if
3380  * not.
3381  * We assume that registers are always usable
3382  */
3383 static bool guest_state_valid(struct kvm_vcpu *vcpu)
3384 {
3385         /* real mode guest state checks */
3386         if (!is_protmode(vcpu)) {
3387                 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
3388                         return false;
3389                 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
3390                         return false;
3391                 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
3392                         return false;
3393                 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
3394                         return false;
3395                 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
3396                         return false;
3397                 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
3398                         return false;
3399         } else {
3400         /* protected mode guest state checks */
3401                 if (!cs_ss_rpl_check(vcpu))
3402                         return false;
3403                 if (!code_segment_valid(vcpu))
3404                         return false;
3405                 if (!stack_segment_valid(vcpu))
3406                         return false;
3407                 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
3408                         return false;
3409                 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
3410                         return false;
3411                 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
3412                         return false;
3413                 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
3414                         return false;
3415                 if (!tr_valid(vcpu))
3416                         return false;
3417                 if (!ldtr_valid(vcpu))
3418                         return false;
3419         }
3420         /* TODO:
3421          * - Add checks on RIP
3422          * - Add checks on RFLAGS
3423          */
3424
3425         return true;
3426 }
3427
3428 static int init_rmode_tss(struct kvm *kvm)
3429 {
3430         gfn_t fn;
3431         u16 data = 0;
3432         int r, idx, ret = 0;
3433
3434         idx = srcu_read_lock(&kvm->srcu);
3435         fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
3436         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
3437         if (r < 0)
3438                 goto out;
3439         data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
3440         r = kvm_write_guest_page(kvm, fn++, &data,
3441                         TSS_IOPB_BASE_OFFSET, sizeof(u16));
3442         if (r < 0)
3443                 goto out;
3444         r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
3445         if (r < 0)
3446                 goto out;
3447         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
3448         if (r < 0)
3449                 goto out;
3450         data = ~0;
3451         r = kvm_write_guest_page(kvm, fn, &data,
3452                                  RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
3453                                  sizeof(u8));
3454         if (r < 0)
3455                 goto out;
3456
3457         ret = 1;
3458 out:
3459         srcu_read_unlock(&kvm->srcu, idx);
3460         return ret;
3461 }
3462
3463 static int init_rmode_identity_map(struct kvm *kvm)
3464 {
3465         int i, idx, r, ret;
3466         pfn_t identity_map_pfn;
3467         u32 tmp;
3468
3469         if (!enable_ept)
3470                 return 1;
3471         if (unlikely(!kvm->arch.ept_identity_pagetable)) {
3472                 printk(KERN_ERR "EPT: identity-mapping pagetable "
3473                         "haven't been allocated!\n");
3474                 return 0;
3475         }
3476         if (likely(kvm->arch.ept_identity_pagetable_done))
3477                 return 1;
3478         ret = 0;
3479         identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
3480         idx = srcu_read_lock(&kvm->srcu);
3481         r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
3482         if (r < 0)
3483                 goto out;
3484         /* Set up identity-mapping pagetable for EPT in real mode */
3485         for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
3486                 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
3487                         _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
3488                 r = kvm_write_guest_page(kvm, identity_map_pfn,
3489                                 &tmp, i * sizeof(tmp), sizeof(tmp));
3490                 if (r < 0)
3491                         goto out;
3492         }
3493         kvm->arch.ept_identity_pagetable_done = true;
3494         ret = 1;
3495 out:
3496         srcu_read_unlock(&kvm->srcu, idx);
3497         return ret;
3498 }
3499
3500 static void seg_setup(int seg)
3501 {
3502         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
3503         unsigned int ar;
3504
3505         vmcs_write16(sf->selector, 0);
3506         vmcs_writel(sf->base, 0);
3507         vmcs_write32(sf->limit, 0xffff);
3508         if (enable_unrestricted_guest) {
3509                 ar = 0x93;
3510                 if (seg == VCPU_SREG_CS)
3511                         ar |= 0x08; /* code segment */
3512         } else
3513                 ar = 0xf3;
3514
3515         vmcs_write32(sf->ar_bytes, ar);
3516 }
3517
3518 static int alloc_apic_access_page(struct kvm *kvm)
3519 {
3520         struct kvm_userspace_memory_region kvm_userspace_mem;
3521         int r = 0;
3522
3523         mutex_lock(&kvm->slots_lock);
3524         if (kvm->arch.apic_access_page)
3525                 goto out;
3526         kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
3527         kvm_userspace_mem.flags = 0;
3528         kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
3529         kvm_userspace_mem.memory_size = PAGE_SIZE;
3530         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
3531         if (r)
3532                 goto out;
3533
3534         kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
3535 out:
3536         mutex_unlock(&kvm->slots_lock);
3537         return r;
3538 }
3539
3540 static int alloc_identity_pagetable(struct kvm *kvm)
3541 {
3542         struct kvm_userspace_memory_region kvm_userspace_mem;
3543         int r = 0;
3544
3545         mutex_lock(&kvm->slots_lock);
3546         if (kvm->arch.ept_identity_pagetable)
3547                 goto out;
3548         kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
3549         kvm_userspace_mem.flags = 0;
3550         kvm_userspace_mem.guest_phys_addr =
3551                 kvm->arch.ept_identity_map_addr;
3552         kvm_userspace_mem.memory_size = PAGE_SIZE;
3553         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
3554         if (r)
3555                 goto out;
3556
3557         kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
3558                         kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
3559 out:
3560         mutex_unlock(&kvm->slots_lock);
3561         return r;
3562 }
3563
3564 static void allocate_vpid(struct vcpu_vmx *vmx)
3565 {
3566         int vpid;
3567
3568         vmx->vpid = 0;
3569         if (!enable_vpid)
3570                 return;
3571         spin_lock(&vmx_vpid_lock);
3572         vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
3573         if (vpid < VMX_NR_VPIDS) {
3574                 vmx->vpid = vpid;
3575                 __set_bit(vpid, vmx_vpid_bitmap);
3576         }
3577         spin_unlock(&vmx_vpid_lock);
3578 }
3579
3580 static void free_vpid(struct vcpu_vmx *vmx)
3581 {
3582         if (!enable_vpid)
3583                 return;
3584         spin_lock(&vmx_vpid_lock);
3585         if (vmx->vpid != 0)
3586                 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
3587         spin_unlock(&vmx_vpid_lock);
3588 }
3589
3590 static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
3591 {
3592         int f = sizeof(unsigned long);
3593
3594         if (!cpu_has_vmx_msr_bitmap())
3595                 return;
3596
3597         /*
3598          * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
3599          * have the write-low and read-high bitmap offsets the wrong way round.
3600          * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
3601          */
3602         if (msr <= 0x1fff) {
3603                 __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
3604                 __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
3605         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
3606                 msr &= 0x1fff;
3607                 __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
3608                 __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
3609         }
3610 }
3611
3612 static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
3613 {
3614         if (!longmode_only)
3615                 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
3616         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
3617 }
3618
3619 /*
3620  * Set up the vmcs's constant host-state fields, i.e., host-state fields that
3621  * will not change in the lifetime of the guest.
3622  * Note that host-state that does change is set elsewhere. E.g., host-state
3623  * that is set differently for each CPU is set in vmx_vcpu_load(), not here.
3624  */
3625 static void vmx_set_constant_host_state(void)
3626 {
3627         u32 low32, high32;
3628         unsigned long tmpl;
3629         struct desc_ptr dt;
3630
3631         vmcs_writel(HOST_CR0, read_cr0() | X86_CR0_TS);  /* 22.2.3 */
3632         vmcs_writel(HOST_CR4, read_cr4());  /* 22.2.3, 22.2.5 */
3633         vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */
3634
3635         vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
3636         vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
3637         vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
3638         vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
3639         vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */
3640
3641         native_store_idt(&dt);
3642         vmcs_writel(HOST_IDTR_BASE, dt.address);   /* 22.2.4 */
3643
3644         asm("mov $.Lkvm_vmx_return, %0" : "=r"(tmpl));
3645         vmcs_writel(HOST_RIP, tmpl); /* 22.2.5 */
3646
3647         rdmsr(MSR_IA32_SYSENTER_CS, low32, high32);
3648         vmcs_write32(HOST_IA32_SYSENTER_CS, low32);
3649         rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl);
3650         vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl);   /* 22.2.3 */
3651
3652         if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
3653                 rdmsr(MSR_IA32_CR_PAT, low32, high32);
3654                 vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32));
3655         }
3656 }
3657
3658 static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx)
3659 {
3660         vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
3661         if (enable_ept)
3662                 vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
3663         if (is_guest_mode(&vmx->vcpu))
3664                 vmx->vcpu.arch.cr4_guest_owned_bits &=
3665                         ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask;
3666         vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
3667 }
3668
3669 static u32 vmx_exec_control(struct vcpu_vmx *vmx)
3670 {
3671         u32 exec_control = vmcs_config.cpu_based_exec_ctrl;
3672         if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
3673                 exec_control &= ~CPU_BASED_TPR_SHADOW;
3674 #ifdef CONFIG_X86_64
3675                 exec_control |= CPU_BASED_CR8_STORE_EXITING |
3676                                 CPU_BASED_CR8_LOAD_EXITING;
3677 #endif
3678         }
3679         if (!enable_ept)
3680                 exec_control |= CPU_BASED_CR3_STORE_EXITING |
3681                                 CPU_BASED_CR3_LOAD_EXITING  |
3682                                 CPU_BASED_INVLPG_EXITING;
3683         return exec_control;
3684 }
3685
3686 static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
3687 {
3688         u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
3689         if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
3690                 exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
3691         if (vmx->vpid == 0)
3692                 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
3693         if (!enable_ept) {
3694                 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
3695                 enable_unrestricted_guest = 0;
3696         }
3697         if (!enable_unrestricted_guest)
3698                 exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
3699         if (!ple_gap)
3700                 exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
3701         return exec_control;
3702 }
3703
3704 static void ept_set_mmio_spte_mask(void)
3705 {
3706         /*
3707          * EPT Misconfigurations can be generated if the value of bits 2:0
3708          * of an EPT paging-structure entry is 110b (write/execute).
3709          * Also, magic bits (0xffull << 49) is set to quickly identify mmio
3710          * spte.
3711          */
3712         kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull);
3713 }
3714
3715 /*
3716  * Sets up the vmcs for emulated real mode.
3717  */
3718 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
3719 {
3720 #ifdef CONFIG_X86_64
3721         unsigned long a;
3722 #endif
3723         int i;
3724
3725         /* I/O */
3726         vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
3727         vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
3728
3729         if (cpu_has_vmx_msr_bitmap())
3730                 vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
3731
3732         vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
3733
3734         /* Control */
3735         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
3736                 vmcs_config.pin_based_exec_ctrl);
3737
3738         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx));
3739
3740         if (cpu_has_secondary_exec_ctrls()) {
3741                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
3742                                 vmx_secondary_exec_control(vmx));
3743         }
3744
3745         if (ple_gap) {
3746                 vmcs_write32(PLE_GAP, ple_gap);
3747                 vmcs_write32(PLE_WINDOW, ple_window);
3748         }
3749
3750         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
3751         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
3752         vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */
3753
3754         vmcs_write16(HOST_FS_SELECTOR, 0);            /* 22.2.4 */
3755         vmcs_write16(HOST_GS_SELECTOR, 0);            /* 22.2.4 */
3756         vmx_set_constant_host_state();
3757 #ifdef CONFIG_X86_64
3758         rdmsrl(MSR_FS_BASE, a);
3759         vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
3760         rdmsrl(MSR_GS_BASE, a);
3761         vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
3762 #else
3763         vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
3764         vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
3765 #endif
3766
3767         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
3768         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
3769         vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host));
3770         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
3771         vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest));
3772
3773         if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
3774                 u32 msr_low, msr_high;
3775                 u64 host_pat;
3776                 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
3777                 host_pat = msr_low | ((u64) msr_high << 32);
3778                 /* Write the default value follow host pat */
3779                 vmcs_write64(GUEST_IA32_PAT, host_pat);
3780                 /* Keep arch.pat sync with GUEST_IA32_PAT */
3781                 vmx->vcpu.arch.pat = host_pat;
3782         }
3783
3784         for (i = 0; i < NR_VMX_MSR; ++i) {
3785                 u32 index = vmx_msr_index[i];
3786                 u32 data_low, data_high;
3787                 int j = vmx->nmsrs;
3788
3789                 if (rdmsr_safe(index, &data_low, &data_high) < 0)
3790                         continue;
3791                 if (wrmsr_safe(index, data_low, data_high) < 0)
3792                         continue;
3793                 vmx->guest_msrs[j].index = i;
3794                 vmx->guest_msrs[j].data = 0;
3795                 vmx->guest_msrs[j].mask = -1ull;
3796                 ++vmx->nmsrs;
3797         }
3798
3799         vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
3800
3801         /* 22.2.1, 20.8.1 */
3802         vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
3803
3804         vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
3805         set_cr4_guest_host_mask(vmx);
3806
3807         kvm_write_tsc(&vmx->vcpu, 0);
3808
3809         return 0;
3810 }
3811
3812 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
3813 {
3814         struct vcpu_vmx *vmx = to_vmx(vcpu);
3815         u64 msr;
3816         int ret;
3817
3818         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
3819
3820         vmx->rmode.vm86_active = 0;
3821
3822         vmx->soft_vnmi_blocked = 0;
3823
3824         vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
3825         kvm_set_cr8(&vmx->vcpu, 0);
3826         msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
3827         if (kvm_vcpu_is_bsp(&vmx->vcpu))
3828                 msr |= MSR_IA32_APICBASE_BSP;
3829         kvm_set_apic_base(&vmx->vcpu, msr);
3830
3831         ret = fx_init(&vmx->vcpu);
3832         if (ret != 0)
3833                 goto out;
3834
3835         vmx_segment_cache_clear(vmx);
3836
3837         seg_setup(VCPU_SREG_CS);
3838         /*
3839          * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
3840          * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
3841          */
3842         if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
3843                 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
3844                 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
3845         } else {
3846                 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
3847                 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
3848         }
3849
3850         seg_setup(VCPU_SREG_DS);
3851         seg_setup(VCPU_SREG_ES);
3852         seg_setup(VCPU_SREG_FS);
3853         seg_setup(VCPU_SREG_GS);
3854         seg_setup(VCPU_SREG_SS);
3855
3856         vmcs_write16(GUEST_TR_SELECTOR, 0);
3857         vmcs_writel(GUEST_TR_BASE, 0);
3858         vmcs_write32(GUEST_TR_LIMIT, 0xffff);
3859         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
3860
3861         vmcs_write16(GUEST_LDTR_SELECTOR, 0);
3862         vmcs_writel(GUEST_LDTR_BASE, 0);
3863         vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
3864         vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
3865
3866         vmcs_write32(GUEST_SYSENTER_CS, 0);
3867         vmcs_writel(GUEST_SYSENTER_ESP, 0);
3868         vmcs_writel(GUEST_SYSENTER_EIP, 0);
3869
3870         vmcs_writel(GUEST_RFLAGS, 0x02);
3871         if (kvm_vcpu_is_bsp(&vmx->vcpu))
3872                 kvm_rip_write(vcpu, 0xfff0);
3873         else
3874                 kvm_rip_write(vcpu, 0);
3875         kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
3876
3877         vmcs_writel(GUEST_DR7, 0x400);
3878
3879         vmcs_writel(GUEST_GDTR_BASE, 0);
3880         vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
3881
3882         vmcs_writel(GUEST_IDTR_BASE, 0);
3883         vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
3884
3885         vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
3886         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
3887         vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
3888
3889         /* Special registers */
3890         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
3891
3892         setup_msrs(vmx);
3893
3894         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */
3895
3896         if (cpu_has_vmx_tpr_shadow()) {
3897                 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
3898                 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
3899                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
3900                                      __pa(vmx->vcpu.arch.apic->regs));
3901                 vmcs_write32(TPR_THRESHOLD, 0);
3902         }
3903
3904         if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
3905                 vmcs_write64(APIC_ACCESS_ADDR,
3906                              page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
3907
3908         if (vmx->vpid != 0)
3909                 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
3910
3911         vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
3912         vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
3913         vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */
3914         srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
3915         vmx_set_cr4(&vmx->vcpu, 0);
3916         vmx_set_efer(&vmx->vcpu, 0);
3917         vmx_fpu_activate(&vmx->vcpu);
3918         update_exception_bitmap(&vmx->vcpu);
3919
3920         vpid_sync_context(vmx);
3921
3922         ret = 0;
3923
3924         /* HACK: Don't enable emulation on guest boot/reset */
3925         vmx->emulation_required = 0;
3926
3927 out:
3928         return ret;
3929 }
3930
3931 /*
3932  * In nested virtualization, check if L1 asked to exit on external interrupts.
3933  * For most existing hypervisors, this will always return true.
3934  */
3935 static bool nested_exit_on_intr(struct kvm_vcpu *vcpu)
3936 {
3937         return get_vmcs12(vcpu)->pin_based_vm_exec_control &
3938                 PIN_BASED_EXT_INTR_MASK;
3939 }
3940
3941 static void enable_irq_window(struct kvm_vcpu *vcpu)
3942 {
3943         u32 cpu_based_vm_exec_control;
3944         if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) {
3945                 /*
3946                  * We get here if vmx_interrupt_allowed() said we can't
3947                  * inject to L1 now because L2 must run. Ask L2 to exit
3948                  * right after entry, so we can inject to L1 more promptly.
3949                  */
3950                 kvm_make_request(KVM_REQ_IMMEDIATE_EXIT, vcpu);
3951                 return;
3952         }
3953
3954         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3955         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
3956         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3957 }
3958
3959 static void enable_nmi_window(struct kvm_vcpu *vcpu)
3960 {
3961         u32 cpu_based_vm_exec_control;
3962
3963         if (!cpu_has_virtual_nmis()) {
3964                 enable_irq_window(vcpu);
3965                 return;
3966         }
3967
3968         if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
3969                 enable_irq_window(vcpu);
3970                 return;
3971         }
3972         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3973         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
3974         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3975 }
3976
3977 static void vmx_inject_irq(struct kvm_vcpu *vcpu)
3978 {
3979         struct vcpu_vmx *vmx = to_vmx(vcpu);
3980         uint32_t intr;
3981         int irq = vcpu->arch.interrupt.nr;
3982
3983         trace_kvm_inj_virq(irq);
3984
3985         ++vcpu->stat.irq_injections;
3986         if (vmx->rmode.vm86_active) {
3987                 int inc_eip = 0;
3988                 if (vcpu->arch.interrupt.soft)
3989                         inc_eip = vcpu->arch.event_exit_inst_len;
3990                 if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE)
3991                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
3992                 return;
3993         }
3994         intr = irq | INTR_INFO_VALID_MASK;
3995         if (vcpu->arch.interrupt.soft) {
3996                 intr |= INTR_TYPE_SOFT_INTR;
3997                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
3998                              vmx->vcpu.arch.event_exit_inst_len);
3999         } else
4000                 intr |= INTR_TYPE_EXT_INTR;
4001         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
4002 }
4003
4004 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
4005 {
4006         struct vcpu_vmx *vmx = to_vmx(vcpu);
4007
4008         if (is_guest_mode(vcpu))
4009                 return;
4010
4011         if (!cpu_has_virtual_nmis()) {
4012                 /*
4013                  * Tracking the NMI-blocked state in software is built upon
4014                  * finding the next open IRQ window. This, in turn, depends on
4015                  * well-behaving guests: They have to keep IRQs disabled at
4016                  * least as long as the NMI handler runs. Otherwise we may
4017                  * cause NMI nesting, maybe breaking the guest. But as this is
4018                  * highly unlikely, we can live with the residual risk.
4019                  */
4020                 vmx->soft_vnmi_blocked = 1;
4021                 vmx->vnmi_blocked_time = 0;
4022         }
4023
4024         ++vcpu->stat.nmi_injections;
4025         vmx->nmi_known_unmasked = false;
4026         if (vmx->rmode.vm86_active) {
4027                 if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE)
4028                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4029                 return;
4030         }
4031         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
4032                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
4033 }
4034
4035 static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
4036 {
4037         if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
4038                 return 0;
4039
4040         return  !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
4041                   (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI
4042                    | GUEST_INTR_STATE_NMI));
4043 }
4044
4045 static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
4046 {
4047         if (!cpu_has_virtual_nmis())
4048                 return to_vmx(vcpu)->soft_vnmi_blocked;
4049         if (to_vmx(vcpu)->nmi_known_unmasked)
4050                 return false;
4051         return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
4052 }
4053
4054 static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
4055 {
4056         struct vcpu_vmx *vmx = to_vmx(vcpu);
4057
4058         if (!cpu_has_virtual_nmis()) {
4059                 if (vmx->soft_vnmi_blocked != masked) {
4060                         vmx->soft_vnmi_blocked = masked;
4061                         vmx->vnmi_blocked_time = 0;
4062                 }
4063         } else {
4064                 vmx->nmi_known_unmasked = !masked;
4065                 if (masked)
4066                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
4067                                       GUEST_INTR_STATE_NMI);
4068                 else
4069                         vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
4070                                         GUEST_INTR_STATE_NMI);
4071         }
4072 }
4073
4074 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
4075 {
4076         if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) {
4077                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
4078                 if (to_vmx(vcpu)->nested.nested_run_pending ||
4079                     (vmcs12->idt_vectoring_info_field &
4080                      VECTORING_INFO_VALID_MASK))
4081                         return 0;
4082                 nested_vmx_vmexit(vcpu);
4083                 vmcs12->vm_exit_reason = EXIT_REASON_EXTERNAL_INTERRUPT;
4084                 vmcs12->vm_exit_intr_info = 0;
4085                 /* fall through to normal code, but now in L1, not L2 */
4086         }
4087
4088         return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
4089                 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
4090                         (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
4091 }
4092
4093 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
4094 {
4095         int ret;
4096         struct kvm_userspace_memory_region tss_mem = {
4097                 .slot = TSS_PRIVATE_MEMSLOT,
4098                 .guest_phys_addr = addr,
4099                 .memory_size = PAGE_SIZE * 3,
4100                 .flags = 0,
4101         };
4102
4103         ret = kvm_set_memory_region(kvm, &tss_mem, 0);
4104         if (ret)
4105                 return ret;
4106         kvm->arch.tss_addr = addr;
4107         if (!init_rmode_tss(kvm))
4108                 return  -ENOMEM;
4109
4110         return 0;
4111 }
4112
4113 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
4114                                   int vec, u32 err_code)
4115 {
4116         /*
4117          * Instruction with address size override prefix opcode 0x67
4118          * Cause the #SS fault with 0 error code in VM86 mode.
4119          */
4120         if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
4121                 if (emulate_instruction(vcpu, 0) == EMULATE_DONE)
4122                         return 1;
4123         /*
4124          * Forward all other exceptions that are valid in real mode.
4125          * FIXME: Breaks guest debugging in real mode, needs to be fixed with
4126          *        the required debugging infrastructure rework.
4127          */
4128         switch (vec) {
4129         case DB_VECTOR:
4130                 if (vcpu->guest_debug &
4131                     (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
4132                         return 0;
4133                 kvm_queue_exception(vcpu, vec);
4134                 return 1;
4135         case BP_VECTOR:
4136                 /*
4137                  * Update instruction length as we may reinject the exception
4138                  * from user space while in guest debugging mode.
4139                  */
4140                 to_vmx(vcpu)->vcpu.arch.event_exit_inst_len =
4141                         vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
4142                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
4143                         return 0;
4144                 /* fall through */
4145         case DE_VECTOR:
4146         case OF_VECTOR:
4147         case BR_VECTOR:
4148         case UD_VECTOR:
4149         case DF_VECTOR:
4150         case SS_VECTOR:
4151         case GP_VECTOR:
4152         case MF_VECTOR:
4153                 kvm_queue_exception(vcpu, vec);
4154                 return 1;
4155         }
4156         return 0;
4157 }
4158
4159 /*
4160  * Trigger machine check on the host. We assume all the MSRs are already set up
4161  * by the CPU and that we still run on the same CPU as the MCE occurred on.
4162  * We pass a fake environment to the machine check handler because we want
4163  * the guest to be always treated like user space, no matter what context
4164  * it used internally.
4165  */
4166 static void kvm_machine_check(void)
4167 {
4168 #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
4169         struct pt_regs regs = {
4170                 .cs = 3, /* Fake ring 3 no matter what the guest ran on */
4171                 .flags = X86_EFLAGS_IF,
4172         };
4173
4174         do_machine_check(&regs, 0);
4175 #endif
4176 }
4177
4178 static int handle_machine_check(struct kvm_vcpu *vcpu)
4179 {
4180         /* already handled by vcpu_run */
4181         return 1;
4182 }
4183
4184 static int handle_exception(struct kvm_vcpu *vcpu)
4185 {
4186         struct vcpu_vmx *vmx = to_vmx(vcpu);
4187         struct kvm_run *kvm_run = vcpu->run;
4188         u32 intr_info, ex_no, error_code;
4189         unsigned long cr2, rip, dr6;
4190         u32 vect_info;
4191         enum emulation_result er;
4192
4193         vect_info = vmx->idt_vectoring_info;
4194         intr_info = vmx->exit_intr_info;
4195
4196         if (is_machine_check(intr_info))
4197                 return handle_machine_check(vcpu);
4198
4199         if ((vect_info & VECTORING_INFO_VALID_MASK) &&
4200             !is_page_fault(intr_info)) {
4201                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4202                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX;
4203                 vcpu->run->internal.ndata = 2;
4204                 vcpu->run->internal.data[0] = vect_info;
4205                 vcpu->run->internal.data[1] = intr_info;
4206                 return 0;
4207         }
4208
4209         if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
4210                 return 1;  /* already handled by vmx_vcpu_run() */
4211
4212         if (is_no_device(intr_info)) {
4213                 vmx_fpu_activate(vcpu);
4214                 return 1;
4215         }
4216
4217         if (is_invalid_opcode(intr_info)) {
4218                 er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
4219                 if (er != EMULATE_DONE)
4220                         kvm_queue_exception(vcpu, UD_VECTOR);
4221                 return 1;
4222         }
4223
4224         error_code = 0;
4225         if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
4226                 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
4227         if (is_page_fault(intr_info)) {
4228                 /* EPT won't cause page fault directly */
4229                 BUG_ON(enable_ept);
4230                 cr2 = vmcs_readl(EXIT_QUALIFICATION);
4231                 trace_kvm_page_fault(cr2, error_code);
4232
4233                 if (kvm_event_needs_reinjection(vcpu))
4234                         kvm_mmu_unprotect_page_virt(vcpu, cr2);
4235                 return kvm_mmu_page_fault(vcpu, cr2, error_code, NULL, 0);
4236         }
4237
4238         if (vmx->rmode.vm86_active &&
4239             handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
4240                                                                 error_code)) {
4241                 if (vcpu->arch.halt_request) {
4242                         vcpu->arch.halt_request = 0;
4243                         return kvm_emulate_halt(vcpu);
4244                 }
4245                 return 1;
4246         }
4247
4248         ex_no = intr_info & INTR_INFO_VECTOR_MASK;
4249         switch (ex_no) {
4250         case DB_VECTOR:
4251                 dr6 = vmcs_readl(EXIT_QUALIFICATION);
4252                 if (!(vcpu->guest_debug &
4253                       (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
4254                         vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
4255                         kvm_queue_exception(vcpu, DB_VECTOR);
4256                         return 1;
4257                 }
4258                 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
4259                 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
4260                 /* fall through */
4261         case BP_VECTOR:
4262                 /*
4263                  * Update instruction length as we may reinject #BP from
4264                  * user space while in guest debugging mode. Reading it for
4265                  * #DB as well causes no harm, it is not used in that case.
4266                  */
4267                 vmx->vcpu.arch.event_exit_inst_len =
4268                         vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
4269                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
4270                 rip = kvm_rip_read(vcpu);
4271                 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
4272                 kvm_run->debug.arch.exception = ex_no;
4273                 break;
4274         default:
4275                 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
4276                 kvm_run->ex.exception = ex_no;
4277                 kvm_run->ex.error_code = error_code;
4278                 break;
4279         }
4280         return 0;
4281 }
4282
4283 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
4284 {
4285         ++vcpu->stat.irq_exits;
4286         return 1;
4287 }
4288
4289 static int handle_triple_fault(struct kvm_vcpu *vcpu)
4290 {
4291         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
4292         return 0;
4293 }
4294
4295 static int handle_io(struct kvm_vcpu *vcpu)
4296 {
4297         unsigned long exit_qualification;
4298         int size, in, string;
4299         unsigned port;
4300
4301         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4302         string = (exit_qualification & 16) != 0;
4303         in = (exit_qualification & 8) != 0;
4304
4305         ++vcpu->stat.io_exits;
4306
4307         if (string || in)
4308                 return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4309
4310         port = exit_qualification >> 16;
4311         size = (exit_qualification & 7) + 1;
4312         skip_emulated_instruction(vcpu);
4313
4314         return kvm_fast_pio_out(vcpu, size, port);
4315 }
4316
4317 static void
4318 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
4319 {
4320         /*
4321          * Patch in the VMCALL instruction:
4322          */
4323         hypercall[0] = 0x0f;
4324         hypercall[1] = 0x01;
4325         hypercall[2] = 0xc1;
4326 }
4327
4328 /* called to set cr0 as approriate for a mov-to-cr0 exit. */
4329 static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val)
4330 {
4331         if (to_vmx(vcpu)->nested.vmxon &&
4332             ((val & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON))
4333                 return 1;
4334
4335         if (is_guest_mode(vcpu)) {
4336                 /*
4337                  * We get here when L2 changed cr0 in a way that did not change
4338                  * any of L1's shadowed bits (see nested_vmx_exit_handled_cr),
4339                  * but did change L0 shadowed bits. This can currently happen
4340                  * with the TS bit: L0 may want to leave TS on (for lazy fpu
4341                  * loading) while pretending to allow the guest to change it.
4342                  */
4343                 if (kvm_set_cr0(vcpu, (val & vcpu->arch.cr0_guest_owned_bits) |
4344                          (vcpu->arch.cr0 & ~vcpu->arch.cr0_guest_owned_bits)))
4345                         return 1;
4346                 vmcs_writel(CR0_READ_SHADOW, val);
4347                 return 0;
4348         } else
4349                 return kvm_set_cr0(vcpu, val);
4350 }
4351
4352 static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val)
4353 {
4354         if (is_guest_mode(vcpu)) {
4355                 if (kvm_set_cr4(vcpu, (val & vcpu->arch.cr4_guest_owned_bits) |
4356                          (vcpu->arch.cr4 & ~vcpu->arch.cr4_guest_owned_bits)))
4357                         return 1;
4358                 vmcs_writel(CR4_READ_SHADOW, val);
4359                 return 0;
4360         } else
4361                 return kvm_set_cr4(vcpu, val);
4362 }
4363
4364 /* called to set cr0 as approriate for clts instruction exit. */
4365 static void handle_clts(struct kvm_vcpu *vcpu)
4366 {
4367         if (is_guest_mode(vcpu)) {
4368                 /*
4369                  * We get here when L2 did CLTS, and L1 didn't shadow CR0.TS
4370                  * but we did (!fpu_active). We need to keep GUEST_CR0.TS on,
4371                  * just pretend it's off (also in arch.cr0 for fpu_activate).
4372                  */
4373                 vmcs_writel(CR0_READ_SHADOW,
4374                         vmcs_readl(CR0_READ_SHADOW) & ~X86_CR0_TS);
4375                 vcpu->arch.cr0 &= ~X86_CR0_TS;
4376         } else
4377                 vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
4378 }
4379
4380 static int handle_cr(struct kvm_vcpu *vcpu)
4381 {
4382         unsigned long exit_qualification, val;
4383         int cr;
4384         int reg;
4385         int err;
4386
4387         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4388         cr = exit_qualification & 15;
4389         reg = (exit_qualification >> 8) & 15;
4390         switch ((exit_qualification >> 4) & 3) {
4391         case 0: /* mov to cr */
4392                 val = kvm_register_read(vcpu, reg);
4393                 trace_kvm_cr_write(cr, val);
4394                 switch (cr) {
4395                 case 0:
4396                         err = handle_set_cr0(vcpu, val);
4397                         kvm_complete_insn_gp(vcpu, err);
4398                         return 1;
4399                 case 3:
4400                         err = kvm_set_cr3(vcpu, val);
4401                         kvm_complete_insn_gp(vcpu, err);
4402                         return 1;
4403                 case 4:
4404                         err = handle_set_cr4(vcpu, val);
4405                         kvm_complete_insn_gp(vcpu, err);
4406                         return 1;
4407                 case 8: {
4408                                 u8 cr8_prev = kvm_get_cr8(vcpu);
4409                                 u8 cr8 = kvm_register_read(vcpu, reg);
4410                                 err = kvm_set_cr8(vcpu, cr8);
4411                                 kvm_complete_insn_gp(vcpu, err);
4412                                 if (irqchip_in_kernel(vcpu->kvm))
4413                                         return 1;
4414                                 if (cr8_prev <= cr8)
4415                                         return 1;
4416                                 vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
4417                                 return 0;
4418                         }
4419                 };
4420                 break;
4421         case 2: /* clts */
4422                 handle_clts(vcpu);
4423                 trace_kvm_cr_write(0, kvm_read_cr0(vcpu));
4424                 skip_emulated_instruction(vcpu);
4425                 vmx_fpu_activate(vcpu);
4426                 return 1;
4427         case 1: /*mov from cr*/
4428                 switch (cr) {
4429                 case 3:
4430                         val = kvm_read_cr3(vcpu);
4431                         kvm_register_write(vcpu, reg, val);
4432                         trace_kvm_cr_read(cr, val);
4433                         skip_emulated_instruction(vcpu);
4434                         return 1;
4435                 case 8:
4436                         val = kvm_get_cr8(vcpu);
4437                         kvm_register_write(vcpu, reg, val);
4438                         trace_kvm_cr_read(cr, val);
4439                         skip_emulated_instruction(vcpu);
4440                         return 1;
4441                 }
4442                 break;
4443         case 3: /* lmsw */
4444                 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
4445                 trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val);
4446                 kvm_lmsw(vcpu, val);
4447
4448                 skip_emulated_instruction(vcpu);
4449                 return 1;
4450         default:
4451                 break;
4452         }
4453         vcpu->run->exit_reason = 0;
4454         pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
4455                (int)(exit_qualification >> 4) & 3, cr);
4456         return 0;
4457 }
4458
4459 static int handle_dr(struct kvm_vcpu *vcpu)
4460 {
4461         unsigned long exit_qualification;
4462         int dr, reg;
4463
4464         /* Do not handle if the CPL > 0, will trigger GP on re-entry */
4465         if (!kvm_require_cpl(vcpu, 0))
4466                 return 1;
4467         dr = vmcs_readl(GUEST_DR7);
4468         if (dr & DR7_GD) {
4469                 /*
4470                  * As the vm-exit takes precedence over the debug trap, we
4471                  * need to emulate the latter, either for the host or the
4472                  * guest debugging itself.
4473                  */
4474                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
4475                         vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
4476                         vcpu->run->debug.arch.dr7 = dr;
4477                         vcpu->run->debug.arch.pc =
4478                                 vmcs_readl(GUEST_CS_BASE) +
4479                                 vmcs_readl(GUEST_RIP);
4480                         vcpu->run->debug.arch.exception = DB_VECTOR;
4481                         vcpu->run->exit_reason = KVM_EXIT_DEBUG;
4482                         return 0;
4483                 } else {
4484                         vcpu->arch.dr7 &= ~DR7_GD;
4485                         vcpu->arch.dr6 |= DR6_BD;
4486                         vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
4487                         kvm_queue_exception(vcpu, DB_VECTOR);
4488                         return 1;
4489                 }
4490         }
4491
4492         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4493         dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
4494         reg = DEBUG_REG_ACCESS_REG(exit_qualification);
4495         if (exit_qualification & TYPE_MOV_FROM_DR) {
4496                 unsigned long val;
4497                 if (!kvm_get_dr(vcpu, dr, &val))
4498                         kvm_register_write(vcpu, reg, val);
4499         } else
4500                 kvm_set_dr(vcpu, dr, vcpu->arch.regs[reg]);
4501         skip_emulated_instruction(vcpu);
4502         return 1;
4503 }
4504
4505 static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val)
4506 {
4507         vmcs_writel(GUEST_DR7, val);
4508 }
4509
4510 static int handle_cpuid(struct kvm_vcpu *vcpu)
4511 {
4512         kvm_emulate_cpuid(vcpu);
4513         return 1;
4514 }
4515
4516 static int handle_rdmsr(struct kvm_vcpu *vcpu)
4517 {
4518         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
4519         u64 data;
4520
4521         if (vmx_get_msr(vcpu, ecx, &data)) {
4522                 trace_kvm_msr_read_ex(ecx);
4523                 kvm_inject_gp(vcpu, 0);
4524                 return 1;
4525         }
4526
4527         trace_kvm_msr_read(ecx, data);
4528
4529         /* FIXME: handling of bits 32:63 of rax, rdx */
4530         vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
4531         vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
4532         skip_emulated_instruction(vcpu);
4533         return 1;
4534 }
4535
4536 static int handle_wrmsr(struct kvm_vcpu *vcpu)
4537 {
4538         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
4539         u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
4540                 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
4541
4542         if (vmx_set_msr(vcpu, ecx, data) != 0) {
4543                 trace_kvm_msr_write_ex(ecx, data);
4544                 kvm_inject_gp(vcpu, 0);
4545                 return 1;
4546         }
4547
4548         trace_kvm_msr_write(ecx, data);
4549         skip_emulated_instruction(vcpu);
4550         return 1;
4551 }
4552
4553 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
4554 {
4555         kvm_make_request(KVM_REQ_EVENT, vcpu);
4556         return 1;
4557 }
4558
4559 static int handle_interrupt_window(struct kvm_vcpu *vcpu)
4560 {
4561         u32 cpu_based_vm_exec_control;
4562
4563         /* clear pending irq */
4564         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4565         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
4566         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
4567
4568         kvm_make_request(KVM_REQ_EVENT, vcpu);
4569
4570         ++vcpu->stat.irq_window_exits;
4571
4572         /*
4573          * If the user space waits to inject interrupts, exit as soon as
4574          * possible
4575          */
4576         if (!irqchip_in_kernel(vcpu->kvm) &&
4577             vcpu->run->request_interrupt_window &&
4578             !kvm_cpu_has_interrupt(vcpu)) {
4579                 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
4580                 return 0;
4581         }
4582         return 1;
4583 }
4584
4585 static int handle_halt(struct kvm_vcpu *vcpu)
4586 {
4587         skip_emulated_instruction(vcpu);
4588         return kvm_emulate_halt(vcpu);
4589 }
4590
4591 static int handle_vmcall(struct kvm_vcpu *vcpu)
4592 {
4593         skip_emulated_instruction(vcpu);
4594         kvm_emulate_hypercall(vcpu);
4595         return 1;
4596 }
4597
4598 static int handle_invd(struct kvm_vcpu *vcpu)
4599 {
4600         return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4601 }
4602
4603 static int handle_invlpg(struct kvm_vcpu *vcpu)
4604 {
4605         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4606
4607         kvm_mmu_invlpg(vcpu, exit_qualification);
4608         skip_emulated_instruction(vcpu);
4609         return 1;
4610 }
4611
4612 static int handle_rdpmc(struct kvm_vcpu *vcpu)
4613 {
4614         int err;
4615
4616         err = kvm_rdpmc(vcpu);
4617         kvm_complete_insn_gp(vcpu, err);
4618
4619         return 1;
4620 }
4621
4622 static int handle_wbinvd(struct kvm_vcpu *vcpu)
4623 {
4624         skip_emulated_instruction(vcpu);
4625         kvm_emulate_wbinvd(vcpu);
4626         return 1;
4627 }
4628
4629 static int handle_xsetbv(struct kvm_vcpu *vcpu)
4630 {
4631         u64 new_bv = kvm_read_edx_eax(vcpu);
4632         u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
4633
4634         if (kvm_set_xcr(vcpu, index, new_bv) == 0)
4635                 skip_emulated_instruction(vcpu);
4636         return 1;
4637 }
4638
4639 static int handle_apic_access(struct kvm_vcpu *vcpu)
4640 {
4641         if (likely(fasteoi)) {
4642                 unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4643                 int access_type, offset;
4644
4645                 access_type = exit_qualification & APIC_ACCESS_TYPE;
4646                 offset = exit_qualification & APIC_ACCESS_OFFSET;
4647                 /*
4648                  * Sane guest uses MOV to write EOI, with written value
4649                  * not cared. So make a short-circuit here by avoiding
4650                  * heavy instruction emulation.
4651                  */
4652                 if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) &&
4653                     (offset == APIC_EOI)) {
4654                         kvm_lapic_set_eoi(vcpu);
4655                         skip_emulated_instruction(vcpu);
4656                         return 1;
4657                 }
4658         }
4659         return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4660 }
4661
4662 static int handle_task_switch(struct kvm_vcpu *vcpu)
4663 {
4664         struct vcpu_vmx *vmx = to_vmx(vcpu);
4665         unsigned long exit_qualification;
4666         bool has_error_code = false;
4667         u32 error_code = 0;
4668         u16 tss_selector;
4669         int reason, type, idt_v, idt_index;
4670
4671         idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
4672         idt_index = (vmx->idt_vectoring_info & VECTORING_INFO_VECTOR_MASK);
4673         type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
4674
4675         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4676
4677         reason = (u32)exit_qualification >> 30;
4678         if (reason == TASK_SWITCH_GATE && idt_v) {
4679                 switch (type) {
4680                 case INTR_TYPE_NMI_INTR:
4681                         vcpu->arch.nmi_injected = false;
4682                         vmx_set_nmi_mask(vcpu, true);
4683                         break;
4684                 case INTR_TYPE_EXT_INTR:
4685                 case INTR_TYPE_SOFT_INTR:
4686                         kvm_clear_interrupt_queue(vcpu);
4687                         break;
4688                 case INTR_TYPE_HARD_EXCEPTION:
4689                         if (vmx->idt_vectoring_info &
4690                             VECTORING_INFO_DELIVER_CODE_MASK) {
4691                                 has_error_code = true;
4692                                 error_code =
4693                                         vmcs_read32(IDT_VECTORING_ERROR_CODE);
4694                         }
4695                         /* fall through */
4696                 case INTR_TYPE_SOFT_EXCEPTION:
4697                         kvm_clear_exception_queue(vcpu);
4698                         break;
4699                 default:
4700                         break;
4701                 }
4702         }
4703         tss_selector = exit_qualification;
4704
4705         if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
4706                        type != INTR_TYPE_EXT_INTR &&
4707                        type != INTR_TYPE_NMI_INTR))
4708                 skip_emulated_instruction(vcpu);
4709
4710         if (kvm_task_switch(vcpu, tss_selector,
4711                             type == INTR_TYPE_SOFT_INTR ? idt_index : -1, reason,
4712                             has_error_code, error_code) == EMULATE_FAIL) {
4713                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4714                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4715                 vcpu->run->internal.ndata = 0;
4716                 return 0;
4717         }
4718
4719         /* clear all local breakpoint enable flags */
4720         vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
4721
4722         /*
4723          * TODO: What about debug traps on tss switch?
4724          *       Are we supposed to inject them and update dr6?
4725          */
4726
4727         return 1;
4728 }
4729
4730 static int handle_ept_violation(struct kvm_vcpu *vcpu)
4731 {
4732         unsigned long exit_qualification;
4733         gpa_t gpa;
4734         int gla_validity;
4735
4736         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4737
4738         if (exit_qualification & (1 << 6)) {
4739                 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
4740                 return -EINVAL;
4741         }
4742
4743         gla_validity = (exit_qualification >> 7) & 0x3;
4744         if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
4745                 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
4746                 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
4747                         (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
4748                         vmcs_readl(GUEST_LINEAR_ADDRESS));
4749                 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
4750                         (long unsigned int)exit_qualification);
4751                 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
4752                 vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
4753                 return 0;
4754         }
4755
4756         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
4757         trace_kvm_page_fault(gpa, exit_qualification);
4758         return kvm_mmu_page_fault(vcpu, gpa, exit_qualification & 0x3, NULL, 0);
4759 }
4760
4761 static u64 ept_rsvd_mask(u64 spte, int level)
4762 {
4763         int i;
4764         u64 mask = 0;
4765
4766         for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
4767                 mask |= (1ULL << i);
4768
4769         if (level > 2)
4770                 /* bits 7:3 reserved */
4771                 mask |= 0xf8;
4772         else if (level == 2) {
4773                 if (spte & (1ULL << 7))
4774                         /* 2MB ref, bits 20:12 reserved */
4775                         mask |= 0x1ff000;
4776                 else
4777                         /* bits 6:3 reserved */
4778                         mask |= 0x78;
4779         }
4780
4781         return mask;
4782 }
4783
4784 static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
4785                                        int level)
4786 {
4787         printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);
4788
4789         /* 010b (write-only) */
4790         WARN_ON((spte & 0x7) == 0x2);
4791
4792         /* 110b (write/execute) */
4793         WARN_ON((spte & 0x7) == 0x6);
4794
4795         /* 100b (execute-only) and value not supported by logical processor */
4796         if (!cpu_has_vmx_ept_execute_only())
4797                 WARN_ON((spte & 0x7) == 0x4);
4798
4799         /* not 000b */
4800         if ((spte & 0x7)) {
4801                 u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);
4802
4803                 if (rsvd_bits != 0) {
4804                         printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
4805                                          __func__, rsvd_bits);
4806                         WARN_ON(1);
4807                 }
4808
4809                 if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) {
4810                         u64 ept_mem_type = (spte & 0x38) >> 3;
4811
4812                         if (ept_mem_type == 2 || ept_mem_type == 3 ||
4813                             ept_mem_type == 7) {
4814                                 printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
4815                                                 __func__, ept_mem_type);
4816                                 WARN_ON(1);
4817                         }
4818                 }
4819         }
4820 }
4821
4822 static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
4823 {
4824         u64 sptes[4];
4825         int nr_sptes, i, ret;
4826         gpa_t gpa;
4827
4828         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
4829
4830         ret = handle_mmio_page_fault_common(vcpu, gpa, true);
4831         if (likely(ret == 1))
4832                 return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) ==
4833                                               EMULATE_DONE;
4834         if (unlikely(!ret))
4835                 return 1;
4836
4837         /* It is the real ept misconfig */
4838         printk(KERN_ERR "EPT: Misconfiguration.\n");
4839         printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);
4840
4841         nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);
4842
4843         for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
4844                 ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);
4845
4846         vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
4847         vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
4848
4849         return 0;
4850 }
4851
4852 static int handle_nmi_window(struct kvm_vcpu *vcpu)
4853 {
4854         u32 cpu_based_vm_exec_control;
4855
4856         /* clear pending NMI */
4857         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4858         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
4859         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
4860         ++vcpu->stat.nmi_window_exits;
4861         kvm_make_request(KVM_REQ_EVENT, vcpu);
4862
4863         return 1;
4864 }
4865
4866 static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
4867 {
4868         struct vcpu_vmx *vmx = to_vmx(vcpu);
4869         enum emulation_result err = EMULATE_DONE;
4870         int ret = 1;
4871         u32 cpu_exec_ctrl;
4872         bool intr_window_requested;
4873
4874         cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4875         intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
4876
4877         while (!guest_state_valid(vcpu)) {
4878                 if (intr_window_requested
4879                     && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
4880                         return handle_interrupt_window(&vmx->vcpu);
4881
4882                 err = emulate_instruction(vcpu, 0);
4883
4884                 if (err == EMULATE_DO_MMIO) {
4885                         ret = 0;
4886                         goto out;
4887                 }
4888
4889                 if (err != EMULATE_DONE)
4890                         return 0;
4891
4892                 if (signal_pending(current))
4893                         goto out;
4894                 if (need_resched())
4895                         schedule();
4896         }
4897
4898         vmx->emulation_required = 0;
4899 out:
4900         return ret;
4901 }
4902
4903 /*
4904  * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
4905  * exiting, so only get here on cpu with PAUSE-Loop-Exiting.
4906  */
4907 static int handle_pause(struct kvm_vcpu *vcpu)
4908 {
4909         skip_emulated_instruction(vcpu);
4910         kvm_vcpu_on_spin(vcpu);
4911
4912         return 1;
4913 }
4914
4915 static int handle_invalid_op(struct kvm_vcpu *vcpu)
4916 {
4917         kvm_queue_exception(vcpu, UD_VECTOR);
4918         return 1;
4919 }
4920
4921 /*
4922  * To run an L2 guest, we need a vmcs02 based on the L1-specified vmcs12.
4923  * We could reuse a single VMCS for all the L2 guests, but we also want the
4924  * option to allocate a separate vmcs02 for each separate loaded vmcs12 - this
4925  * allows keeping them loaded on the processor, and in the future will allow
4926  * optimizations where prepare_vmcs02 doesn't need to set all the fields on
4927  * every entry if they never change.
4928  * So we keep, in vmx->nested.vmcs02_pool, a cache of size VMCS02_POOL_SIZE
4929  * (>=0) with a vmcs02 for each recently loaded vmcs12s, most recent first.
4930  *
4931  * The following functions allocate and free a vmcs02 in this pool.
4932  */
4933
4934 /* Get a VMCS from the pool to use as vmcs02 for the current vmcs12. */
4935 static struct loaded_vmcs *nested_get_current_vmcs02(struct vcpu_vmx *vmx)
4936 {
4937         struct vmcs02_list *item;
4938         list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
4939                 if (item->vmptr == vmx->nested.current_vmptr) {
4940                         list_move(&item->list, &vmx->nested.vmcs02_pool);
4941                         return &item->vmcs02;
4942                 }
4943
4944         if (vmx->nested.vmcs02_num >= max(VMCS02_POOL_SIZE, 1)) {
4945                 /* Recycle the least recently used VMCS. */
4946                 item = list_entry(vmx->nested.vmcs02_pool.prev,
4947                         struct vmcs02_list, list);
4948                 item->vmptr = vmx->nested.current_vmptr;
4949                 list_move(&item->list, &vmx->nested.vmcs02_pool);
4950                 return &item->vmcs02;
4951         }
4952
4953         /* Create a new VMCS */
4954         item = (struct vmcs02_list *)
4955                 kmalloc(sizeof(struct vmcs02_list), GFP_KERNEL);
4956         if (!item)
4957                 return NULL;
4958         item->vmcs02.vmcs = alloc_vmcs();
4959         if (!item->vmcs02.vmcs) {
4960                 kfree(item);
4961                 return NULL;
4962         }
4963         loaded_vmcs_init(&item->vmcs02);
4964         item->vmptr = vmx->nested.current_vmptr;
4965         list_add(&(item->list), &(vmx->nested.vmcs02_pool));
4966         vmx->nested.vmcs02_num++;
4967         return &item->vmcs02;
4968 }
4969
4970 /* Free and remove from pool a vmcs02 saved for a vmcs12 (if there is one) */
4971 static void nested_free_vmcs02(struct vcpu_vmx *vmx, gpa_t vmptr)
4972 {
4973         struct vmcs02_list *item;
4974         list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
4975                 if (item->vmptr == vmptr) {
4976                         free_loaded_vmcs(&item->vmcs02);
4977                         list_del(&item->list);
4978                         kfree(item);
4979                         vmx->nested.vmcs02_num--;
4980                         return;
4981                 }
4982 }
4983
4984 /*
4985  * Free all VMCSs saved for this vcpu, except the one pointed by
4986  * vmx->loaded_vmcs. These include the VMCSs in vmcs02_pool (except the one
4987  * currently used, if running L2), and vmcs01 when running L2.
4988  */
4989 static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx)
4990 {
4991         struct vmcs02_list *item, *n;
4992         list_for_each_entry_safe(item, n, &vmx->nested.vmcs02_pool, list) {
4993                 if (vmx->loaded_vmcs != &item->vmcs02)
4994                         free_loaded_vmcs(&item->vmcs02);
4995                 list_del(&item->list);
4996                 kfree(item);
4997         }
4998         vmx->nested.vmcs02_num = 0;
4999
5000         if (vmx->loaded_vmcs != &vmx->vmcs01)
5001                 free_loaded_vmcs(&vmx->vmcs01);
5002 }
5003
5004 /*
5005  * Emulate the VMXON instruction.
5006  * Currently, we just remember that VMX is active, and do not save or even
5007  * inspect the argument to VMXON (the so-called "VMXON pointer") because we
5008  * do not currently need to store anything in that guest-allocated memory
5009  * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their
5010  * argument is different from the VMXON pointer (which the spec says they do).
5011  */
5012 static int handle_vmon(struct kvm_vcpu *vcpu)
5013 {
5014         struct kvm_segment cs;
5015         struct vcpu_vmx *vmx = to_vmx(vcpu);
5016
5017         /* The Intel VMX Instruction Reference lists a bunch of bits that
5018          * are prerequisite to running VMXON, most notably cr4.VMXE must be
5019          * set to 1 (see vmx_set_cr4() for when we allow the guest to set this).
5020          * Otherwise, we should fail with #UD. We test these now:
5021          */
5022         if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE) ||
5023             !kvm_read_cr0_bits(vcpu, X86_CR0_PE) ||
5024             (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) {
5025                 kvm_queue_exception(vcpu, UD_VECTOR);
5026                 return 1;
5027         }
5028
5029         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
5030         if (is_long_mode(vcpu) && !cs.l) {
5031                 kvm_queue_exception(vcpu, UD_VECTOR);
5032                 return 1;
5033         }
5034
5035         if (vmx_get_cpl(vcpu)) {
5036                 kvm_inject_gp(vcpu, 0);
5037                 return 1;
5038         }
5039
5040         INIT_LIST_HEAD(&(vmx->nested.vmcs02_pool));
5041         vmx->nested.vmcs02_num = 0;
5042
5043         vmx->nested.vmxon = true;
5044
5045         skip_emulated_instruction(vcpu);
5046         return 1;
5047 }
5048
5049 /*
5050  * Intel's VMX Instruction Reference specifies a common set of prerequisites
5051  * for running VMX instructions (except VMXON, whose prerequisites are
5052  * slightly different). It also specifies what exception to inject otherwise.
5053  */
5054 static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
5055 {
5056         struct kvm_segment cs;
5057         struct vcpu_vmx *vmx = to_vmx(vcpu);
5058
5059         if (!vmx->nested.vmxon) {
5060                 kvm_queue_exception(vcpu, UD_VECTOR);
5061                 return 0;
5062         }
5063
5064         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
5065         if ((vmx_get_rflags(vcpu) & X86_EFLAGS_VM) ||
5066             (is_long_mode(vcpu) && !cs.l)) {
5067                 kvm_queue_exception(vcpu, UD_VECTOR);
5068                 return 0;
5069         }
5070
5071         if (vmx_get_cpl(vcpu)) {
5072                 kvm_inject_gp(vcpu, 0);
5073                 return 0;
5074         }
5075
5076         return 1;
5077 }
5078
5079 /*
5080  * Free whatever needs to be freed from vmx->nested when L1 goes down, or
5081  * just stops using VMX.
5082  */
5083 static void free_nested(struct vcpu_vmx *vmx)
5084 {
5085         if (!vmx->nested.vmxon)
5086                 return;
5087         vmx->nested.vmxon = false;
5088         if (vmx->nested.current_vmptr != -1ull) {
5089                 kunmap(vmx->nested.current_vmcs12_page);
5090                 nested_release_page(vmx->nested.current_vmcs12_page);
5091                 vmx->nested.current_vmptr = -1ull;
5092                 vmx->nested.current_vmcs12 = NULL;
5093         }
5094         /* Unpin physical memory we referred to in current vmcs02 */
5095         if (vmx->nested.apic_access_page) {
5096                 nested_release_page(vmx->nested.apic_access_page);
5097                 vmx->nested.apic_access_page = 0;
5098         }
5099
5100         nested_free_all_saved_vmcss(vmx);
5101 }
5102
5103 /* Emulate the VMXOFF instruction */
5104 static int handle_vmoff(struct kvm_vcpu *vcpu)
5105 {
5106         if (!nested_vmx_check_permission(vcpu))
5107                 return 1;
5108         free_nested(to_vmx(vcpu));
5109         skip_emulated_instruction(vcpu);
5110         return 1;
5111 }
5112
5113 /*
5114  * Decode the memory-address operand of a vmx instruction, as recorded on an
5115  * exit caused by such an instruction (run by a guest hypervisor).
5116  * On success, returns 0. When the operand is invalid, returns 1 and throws
5117  * #UD or #GP.
5118  */
5119 static int get_vmx_mem_address(struct kvm_vcpu *vcpu,
5120                                  unsigned long exit_qualification,
5121                                  u32 vmx_instruction_info, gva_t *ret)
5122 {
5123         /*
5124          * According to Vol. 3B, "Information for VM Exits Due to Instruction
5125          * Execution", on an exit, vmx_instruction_info holds most of the
5126          * addressing components of the operand. Only the displacement part
5127          * is put in exit_qualification (see 3B, "Basic VM-Exit Information").
5128          * For how an actual address is calculated from all these components,
5129          * refer to Vol. 1, "Operand Addressing".
5130          */
5131         int  scaling = vmx_instruction_info & 3;
5132         int  addr_size = (vmx_instruction_info >> 7) & 7;
5133         bool is_reg = vmx_instruction_info & (1u << 10);
5134         int  seg_reg = (vmx_instruction_info >> 15) & 7;
5135         int  index_reg = (vmx_instruction_info >> 18) & 0xf;
5136         bool index_is_valid = !(vmx_instruction_info & (1u << 22));
5137         int  base_reg       = (vmx_instruction_info >> 23) & 0xf;
5138         bool base_is_valid  = !(vmx_instruction_info & (1u << 27));
5139
5140         if (is_reg) {
5141                 kvm_queue_exception(vcpu, UD_VECTOR);
5142                 return 1;
5143         }
5144
5145         /* Addr = segment_base + offset */
5146         /* offset = base + [index * scale] + displacement */
5147         *ret = vmx_get_segment_base(vcpu, seg_reg);
5148         if (base_is_valid)
5149                 *ret += kvm_register_read(vcpu, base_reg);
5150         if (index_is_valid)
5151                 *ret += kvm_register_read(vcpu, index_reg)<<scaling;
5152         *ret += exit_qualification; /* holds the displacement */
5153
5154         if (addr_size == 1) /* 32 bit */
5155                 *ret &= 0xffffffff;
5156
5157         /*
5158          * TODO: throw #GP (and return 1) in various cases that the VM*
5159          * instructions require it - e.g., offset beyond segment limit,
5160          * unusable or unreadable/unwritable segment, non-canonical 64-bit
5161          * address, and so on. Currently these are not checked.
5162          */
5163         return 0;
5164 }
5165
5166 /*
5167  * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
5168  * set the success or error code of an emulated VMX instruction, as specified
5169  * by Vol 2B, VMX Instruction Reference, "Conventions".
5170  */
5171 static void nested_vmx_succeed(struct kvm_vcpu *vcpu)
5172 {
5173         vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
5174                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
5175                             X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
5176 }
5177
5178 static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
5179 {
5180         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
5181                         & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
5182                             X86_EFLAGS_SF | X86_EFLAGS_OF))
5183                         | X86_EFLAGS_CF);
5184 }
5185
5186 static void nested_vmx_failValid(struct kvm_vcpu *vcpu,
5187                                         u32 vm_instruction_error)
5188 {
5189         if (to_vmx(vcpu)->nested.current_vmptr == -1ull) {
5190                 /*
5191                  * failValid writes the error number to the current VMCS, which
5192                  * can't be done there isn't a current VMCS.
5193                  */
5194                 nested_vmx_failInvalid(vcpu);
5195                 return;
5196         }
5197         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
5198                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
5199                             X86_EFLAGS_SF | X86_EFLAGS_OF))
5200                         | X86_EFLAGS_ZF);
5201         get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
5202 }
5203
5204 /* Emulate the VMCLEAR instruction */
5205 static int handle_vmclear(struct kvm_vcpu *vcpu)
5206 {
5207         struct vcpu_vmx *vmx = to_vmx(vcpu);
5208         gva_t gva;
5209         gpa_t vmptr;
5210         struct vmcs12 *vmcs12;
5211         struct page *page;
5212         struct x86_exception e;
5213
5214         if (!nested_vmx_check_permission(vcpu))
5215                 return 1;
5216
5217         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
5218                         vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
5219                 return 1;
5220
5221         if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
5222                                 sizeof(vmptr), &e)) {
5223                 kvm_inject_page_fault(vcpu, &e);
5224                 return 1;
5225         }
5226
5227         if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {
5228                 nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);
5229                 skip_emulated_instruction(vcpu);
5230                 return 1;
5231         }
5232
5233         if (vmptr == vmx->nested.current_vmptr) {
5234                 kunmap(vmx->nested.current_vmcs12_page);
5235                 nested_release_page(vmx->nested.current_vmcs12_page);
5236                 vmx->nested.current_vmptr = -1ull;
5237                 vmx->nested.current_vmcs12 = NULL;
5238         }
5239
5240         page = nested_get_page(vcpu, vmptr);
5241         if (page == NULL) {
5242                 /*
5243                  * For accurate processor emulation, VMCLEAR beyond available
5244                  * physical memory should do nothing at all. However, it is
5245                  * possible that a nested vmx bug, not a guest hypervisor bug,
5246                  * resulted in this case, so let's shut down before doing any
5247                  * more damage:
5248                  */
5249                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
5250                 return 1;
5251         }
5252         vmcs12 = kmap(page);
5253         vmcs12->launch_state = 0;
5254         kunmap(page);
5255         nested_release_page(page);
5256
5257         nested_free_vmcs02(vmx, vmptr);
5258
5259         skip_emulated_instruction(vcpu);
5260         nested_vmx_succeed(vcpu);
5261         return 1;
5262 }
5263
5264 static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch);
5265
5266 /* Emulate the VMLAUNCH instruction */
5267 static int handle_vmlaunch(struct kvm_vcpu *vcpu)
5268 {
5269         return nested_vmx_run(vcpu, true);
5270 }
5271
5272 /* Emulate the VMRESUME instruction */
5273 static int handle_vmresume(struct kvm_vcpu *vcpu)
5274 {
5275
5276         return nested_vmx_run(vcpu, false);
5277 }
5278
5279 enum vmcs_field_type {
5280         VMCS_FIELD_TYPE_U16 = 0,
5281         VMCS_FIELD_TYPE_U64 = 1,
5282         VMCS_FIELD_TYPE_U32 = 2,
5283         VMCS_FIELD_TYPE_NATURAL_WIDTH = 3
5284 };
5285
5286 static inline int vmcs_field_type(unsigned long field)
5287 {
5288         if (0x1 & field)        /* the *_HIGH fields are all 32 bit */
5289                 return VMCS_FIELD_TYPE_U32;
5290         return (field >> 13) & 0x3 ;
5291 }
5292
5293 static inline int vmcs_field_readonly(unsigned long field)
5294 {
5295         return (((field >> 10) & 0x3) == 1);
5296 }
5297
5298 /*
5299  * Read a vmcs12 field. Since these can have varying lengths and we return
5300  * one type, we chose the biggest type (u64) and zero-extend the return value
5301  * to that size. Note that the caller, handle_vmread, might need to use only
5302  * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of
5303  * 64-bit fields are to be returned).
5304  */
5305 static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu,
5306                                         unsigned long field, u64 *ret)
5307 {
5308         short offset = vmcs_field_to_offset(field);
5309         char *p;
5310
5311         if (offset < 0)
5312                 return 0;
5313
5314         p = ((char *)(get_vmcs12(vcpu))) + offset;
5315
5316         switch (vmcs_field_type(field)) {
5317         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
5318                 *ret = *((natural_width *)p);
5319                 return 1;
5320         case VMCS_FIELD_TYPE_U16:
5321                 *ret = *((u16 *)p);
5322                 return 1;
5323         case VMCS_FIELD_TYPE_U32:
5324                 *ret = *((u32 *)p);
5325                 return 1;
5326         case VMCS_FIELD_TYPE_U64:
5327                 *ret = *((u64 *)p);
5328                 return 1;
5329         default:
5330                 return 0; /* can never happen. */
5331         }
5332 }
5333
5334 /*
5335  * VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
5336  * used before) all generate the same failure when it is missing.
5337  */
5338 static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu)
5339 {
5340         struct vcpu_vmx *vmx = to_vmx(vcpu);
5341         if (vmx->nested.current_vmptr == -1ull) {
5342                 nested_vmx_failInvalid(vcpu);
5343                 skip_emulated_instruction(vcpu);
5344                 return 0;
5345         }
5346         return 1;
5347 }
5348
5349 static int handle_vmread(struct kvm_vcpu *vcpu)
5350 {
5351         unsigned long field;
5352         u64 field_value;
5353         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5354         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5355         gva_t gva = 0;
5356
5357         if (!nested_vmx_check_permission(vcpu) ||
5358             !nested_vmx_check_vmcs12(vcpu))
5359                 return 1;
5360
5361         /* Decode instruction info and find the field to read */
5362         field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
5363         /* Read the field, zero-extended to a u64 field_value */
5364         if (!vmcs12_read_any(vcpu, field, &field_value)) {
5365                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5366                 skip_emulated_instruction(vcpu);
5367                 return 1;
5368         }
5369         /*
5370          * Now copy part of this value to register or memory, as requested.
5371          * Note that the number of bits actually copied is 32 or 64 depending
5372          * on the guest's mode (32 or 64 bit), not on the given field's length.
5373          */
5374         if (vmx_instruction_info & (1u << 10)) {
5375                 kvm_register_write(vcpu, (((vmx_instruction_info) >> 3) & 0xf),
5376                         field_value);
5377         } else {
5378                 if (get_vmx_mem_address(vcpu, exit_qualification,
5379                                 vmx_instruction_info, &gva))
5380                         return 1;
5381                 /* _system ok, as nested_vmx_check_permission verified cpl=0 */
5382                 kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva,
5383                              &field_value, (is_long_mode(vcpu) ? 8 : 4), NULL);
5384         }
5385
5386         nested_vmx_succeed(vcpu);
5387         skip_emulated_instruction(vcpu);
5388         return 1;
5389 }
5390
5391
5392 static int handle_vmwrite(struct kvm_vcpu *vcpu)
5393 {
5394         unsigned long field;
5395         gva_t gva;
5396         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5397         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5398         char *p;
5399         short offset;
5400         /* The value to write might be 32 or 64 bits, depending on L1's long
5401          * mode, and eventually we need to write that into a field of several
5402          * possible lengths. The code below first zero-extends the value to 64
5403          * bit (field_value), and then copies only the approriate number of
5404          * bits into the vmcs12 field.
5405          */
5406         u64 field_value = 0;
5407         struct x86_exception e;
5408
5409         if (!nested_vmx_check_permission(vcpu) ||
5410             !nested_vmx_check_vmcs12(vcpu))
5411                 return 1;
5412
5413         if (vmx_instruction_info & (1u << 10))
5414                 field_value = kvm_register_read(vcpu,
5415                         (((vmx_instruction_info) >> 3) & 0xf));
5416         else {
5417                 if (get_vmx_mem_address(vcpu, exit_qualification,
5418                                 vmx_instruction_info, &gva))
5419                         return 1;
5420                 if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva,
5421                            &field_value, (is_long_mode(vcpu) ? 8 : 4), &e)) {
5422                         kvm_inject_page_fault(vcpu, &e);
5423                         return 1;
5424                 }
5425         }
5426
5427
5428         field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
5429         if (vmcs_field_readonly(field)) {
5430                 nested_vmx_failValid(vcpu,
5431                         VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
5432                 skip_emulated_instruction(vcpu);
5433                 return 1;
5434         }
5435
5436         offset = vmcs_field_to_offset(field);
5437         if (offset < 0) {
5438                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5439                 skip_emulated_instruction(vcpu);
5440                 return 1;
5441         }
5442         p = ((char *) get_vmcs12(vcpu)) + offset;
5443
5444         switch (vmcs_field_type(field)) {
5445         case VMCS_FIELD_TYPE_U16:
5446                 *(u16 *)p = field_value;
5447                 break;
5448         case VMCS_FIELD_TYPE_U32:
5449                 *(u32 *)p = field_value;
5450                 break;
5451         case VMCS_FIELD_TYPE_U64:
5452                 *(u64 *)p = field_value;
5453                 break;
5454         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
5455                 *(natural_width *)p = field_value;
5456                 break;
5457         default:
5458                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5459                 skip_emulated_instruction(vcpu);
5460                 return 1;
5461         }
5462
5463         nested_vmx_succeed(vcpu);
5464         skip_emulated_instruction(vcpu);
5465         return 1;
5466 }
5467
5468 /* Emulate the VMPTRLD instruction */
5469 static int handle_vmptrld(struct kvm_vcpu *vcpu)
5470 {
5471         struct vcpu_vmx *vmx = to_vmx(vcpu);
5472         gva_t gva;
5473         gpa_t vmptr;
5474         struct x86_exception e;
5475
5476         if (!nested_vmx_check_permission(vcpu))
5477                 return 1;
5478
5479         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
5480                         vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
5481                 return 1;
5482
5483         if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
5484                                 sizeof(vmptr), &e)) {
5485                 kvm_inject_page_fault(vcpu, &e);
5486                 return 1;
5487         }
5488
5489         if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {
5490                 nested_vmx_failValid(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS);
5491                 skip_emulated_instruction(vcpu);
5492                 return 1;
5493         }
5494
5495         if (vmx->nested.current_vmptr != vmptr) {
5496                 struct vmcs12 *new_vmcs12;
5497                 struct page *page;
5498                 page = nested_get_page(vcpu, vmptr);
5499                 if (page == NULL) {
5500                         nested_vmx_failInvalid(vcpu);
5501                         skip_emulated_instruction(vcpu);
5502                         return 1;
5503                 }
5504                 new_vmcs12 = kmap(page);
5505                 if (new_vmcs12->revision_id != VMCS12_REVISION) {
5506                         kunmap(page);
5507                         nested_release_page_clean(page);
5508                         nested_vmx_failValid(vcpu,
5509                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
5510                         skip_emulated_instruction(vcpu);
5511                         return 1;
5512                 }
5513                 if (vmx->nested.current_vmptr != -1ull) {
5514                         kunmap(vmx->nested.current_vmcs12_page);
5515                         nested_release_page(vmx->nested.current_vmcs12_page);
5516                 }
5517
5518                 vmx->nested.current_vmptr = vmptr;
5519                 vmx->nested.current_vmcs12 = new_vmcs12;
5520                 vmx->nested.current_vmcs12_page = page;
5521         }
5522
5523         nested_vmx_succeed(vcpu);
5524         skip_emulated_instruction(vcpu);
5525         return 1;
5526 }
5527
5528 /* Emulate the VMPTRST instruction */
5529 static int handle_vmptrst(struct kvm_vcpu *vcpu)
5530 {
5531         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5532         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5533         gva_t vmcs_gva;
5534         struct x86_exception e;
5535
5536         if (!nested_vmx_check_permission(vcpu))
5537                 return 1;
5538
5539         if (get_vmx_mem_address(vcpu, exit_qualification,
5540                         vmx_instruction_info, &vmcs_gva))
5541                 return 1;
5542         /* ok to use *_system, as nested_vmx_check_permission verified cpl=0 */
5543         if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva,
5544                                  (void *)&to_vmx(vcpu)->nested.current_vmptr,
5545                                  sizeof(u64), &e)) {
5546                 kvm_inject_page_fault(vcpu, &e);
5547                 return 1;
5548         }
5549         nested_vmx_succeed(vcpu);
5550         skip_emulated_instruction(vcpu);
5551         return 1;
5552 }
5553
5554 /*
5555  * The exit handlers return 1 if the exit was handled fully and guest execution
5556  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
5557  * to be done to userspace and return 0.
5558  */
5559 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
5560         [EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
5561         [EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
5562         [EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
5563         [EXIT_REASON_NMI_WINDOW]              = handle_nmi_window,
5564         [EXIT_REASON_IO_INSTRUCTION]          = handle_io,
5565         [EXIT_REASON_CR_ACCESS]               = handle_cr,
5566         [EXIT_REASON_DR_ACCESS]               = handle_dr,
5567         [EXIT_REASON_CPUID]                   = handle_cpuid,
5568         [EXIT_REASON_MSR_READ]                = handle_rdmsr,
5569         [EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
5570         [EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
5571         [EXIT_REASON_HLT]                     = handle_halt,
5572         [EXIT_REASON_INVD]                    = handle_invd,
5573         [EXIT_REASON_INVLPG]                  = handle_invlpg,
5574         [EXIT_REASON_RDPMC]                   = handle_rdpmc,
5575         [EXIT_REASON_VMCALL]                  = handle_vmcall,
5576         [EXIT_REASON_VMCLEAR]                 = handle_vmclear,
5577         [EXIT_REASON_VMLAUNCH]                = handle_vmlaunch,
5578         [EXIT_REASON_VMPTRLD]                 = handle_vmptrld,
5579         [EXIT_REASON_VMPTRST]                 = handle_vmptrst,
5580         [EXIT_REASON_VMREAD]                  = handle_vmread,
5581         [EXIT_REASON_VMRESUME]                = handle_vmresume,
5582         [EXIT_REASON_VMWRITE]                 = handle_vmwrite,
5583         [EXIT_REASON_VMOFF]                   = handle_vmoff,
5584         [EXIT_REASON_VMON]                    = handle_vmon,
5585         [EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
5586         [EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
5587         [EXIT_REASON_WBINVD]                  = handle_wbinvd,
5588         [EXIT_REASON_XSETBV]                  = handle_xsetbv,
5589         [EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
5590         [EXIT_REASON_MCE_DURING_VMENTRY]      = handle_machine_check,
5591         [EXIT_REASON_EPT_VIOLATION]           = handle_ept_violation,
5592         [EXIT_REASON_EPT_MISCONFIG]           = handle_ept_misconfig,
5593         [EXIT_REASON_PAUSE_INSTRUCTION]       = handle_pause,
5594         [EXIT_REASON_MWAIT_INSTRUCTION]       = handle_invalid_op,
5595         [EXIT_REASON_MONITOR_INSTRUCTION]     = handle_invalid_op,
5596 };
5597
5598 static const int kvm_vmx_max_exit_handlers =
5599         ARRAY_SIZE(kvm_vmx_exit_handlers);
5600
5601 /*
5602  * Return 1 if we should exit from L2 to L1 to handle an MSR access access,
5603  * rather than handle it ourselves in L0. I.e., check whether L1 expressed
5604  * disinterest in the current event (read or write a specific MSR) by using an
5605  * MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps.
5606  */
5607 static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu,
5608         struct vmcs12 *vmcs12, u32 exit_reason)
5609 {
5610         u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX];
5611         gpa_t bitmap;
5612
5613         if (!nested_cpu_has(get_vmcs12(vcpu), CPU_BASED_USE_MSR_BITMAPS))
5614                 return 1;
5615
5616         /*
5617          * The MSR_BITMAP page is divided into four 1024-byte bitmaps,
5618          * for the four combinations of read/write and low/high MSR numbers.
5619          * First we need to figure out which of the four to use:
5620          */
5621         bitmap = vmcs12->msr_bitmap;
5622         if (exit_reason == EXIT_REASON_MSR_WRITE)
5623                 bitmap += 2048;
5624         if (msr_index >= 0xc0000000) {
5625                 msr_index -= 0xc0000000;
5626                 bitmap += 1024;
5627         }
5628
5629         /* Then read the msr_index'th bit from this bitmap: */
5630         if (msr_index < 1024*8) {
5631                 unsigned char b;
5632                 kvm_read_guest(vcpu->kvm, bitmap + msr_index/8, &b, 1);
5633                 return 1 & (b >> (msr_index & 7));
5634         } else
5635                 return 1; /* let L1 handle the wrong parameter */
5636 }
5637
5638 /*
5639  * Return 1 if we should exit from L2 to L1 to handle a CR access exit,
5640  * rather than handle it ourselves in L0. I.e., check if L1 wanted to
5641  * intercept (via guest_host_mask etc.) the current event.
5642  */
5643 static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
5644         struct vmcs12 *vmcs12)
5645 {
5646         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5647         int cr = exit_qualification & 15;
5648         int reg = (exit_qualification >> 8) & 15;
5649         unsigned long val = kvm_register_read(vcpu, reg);
5650
5651         switch ((exit_qualification >> 4) & 3) {
5652         case 0: /* mov to cr */
5653                 switch (cr) {
5654                 case 0:
5655                         if (vmcs12->cr0_guest_host_mask &
5656                             (val ^ vmcs12->cr0_read_shadow))
5657                                 return 1;
5658                         break;
5659                 case 3:
5660                         if ((vmcs12->cr3_target_count >= 1 &&
5661                                         vmcs12->cr3_target_value0 == val) ||
5662                                 (vmcs12->cr3_target_count >= 2 &&
5663                                         vmcs12->cr3_target_value1 == val) ||
5664                                 (vmcs12->cr3_target_count >= 3 &&
5665                                         vmcs12->cr3_target_value2 == val) ||
5666                                 (vmcs12->cr3_target_count >= 4 &&
5667                                         vmcs12->cr3_target_value3 == val))
5668                                 return 0;
5669                         if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING))
5670                                 return 1;
5671                         break;
5672                 case 4:
5673                         if (vmcs12->cr4_guest_host_mask &
5674                             (vmcs12->cr4_read_shadow ^ val))
5675                                 return 1;
5676                         break;
5677                 case 8:
5678                         if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING))
5679                                 return 1;
5680                         break;
5681                 }
5682                 break;
5683         case 2: /* clts */
5684                 if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) &&
5685                     (vmcs12->cr0_read_shadow & X86_CR0_TS))
5686                         return 1;
5687                 break;
5688         case 1: /* mov from cr */
5689                 switch (cr) {
5690                 case 3:
5691                         if (vmcs12->cpu_based_vm_exec_control &
5692                             CPU_BASED_CR3_STORE_EXITING)
5693                                 return 1;
5694                         break;
5695                 case 8:
5696                         if (vmcs12->cpu_based_vm_exec_control &
5697                             CPU_BASED_CR8_STORE_EXITING)
5698                                 return 1;
5699                         break;
5700                 }
5701                 break;
5702         case 3: /* lmsw */
5703                 /*
5704                  * lmsw can change bits 1..3 of cr0, and only set bit 0 of
5705                  * cr0. Other attempted changes are ignored, with no exit.
5706                  */
5707                 if (vmcs12->cr0_guest_host_mask & 0xe &
5708                     (val ^ vmcs12->cr0_read_shadow))
5709                         return 1;
5710                 if ((vmcs12->cr0_guest_host_mask & 0x1) &&
5711                     !(vmcs12->cr0_read_shadow & 0x1) &&
5712                     (val & 0x1))
5713                         return 1;
5714                 break;
5715         }
5716         return 0;
5717 }
5718
5719 /*
5720  * Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we
5721  * should handle it ourselves in L0 (and then continue L2). Only call this
5722  * when in is_guest_mode (L2).
5723  */
5724 static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
5725 {
5726         u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
5727         u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5728         struct vcpu_vmx *vmx = to_vmx(vcpu);
5729         struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
5730
5731         if (vmx->nested.nested_run_pending)
5732                 return 0;
5733
5734         if (unlikely(vmx->fail)) {
5735                 pr_info_ratelimited("%s failed vm entry %x\n", __func__,
5736                                     vmcs_read32(VM_INSTRUCTION_ERROR));
5737                 return 1;
5738         }
5739
5740         switch (exit_reason) {
5741         case EXIT_REASON_EXCEPTION_NMI:
5742                 if (!is_exception(intr_info))
5743                         return 0;
5744                 else if (is_page_fault(intr_info))
5745                         return enable_ept;
5746                 return vmcs12->exception_bitmap &
5747                                 (1u << (intr_info & INTR_INFO_VECTOR_MASK));
5748         case EXIT_REASON_EXTERNAL_INTERRUPT:
5749                 return 0;
5750         case EXIT_REASON_TRIPLE_FAULT:
5751                 return 1;
5752         case EXIT_REASON_PENDING_INTERRUPT:
5753         case EXIT_REASON_NMI_WINDOW:
5754                 /*
5755                  * prepare_vmcs02() set the CPU_BASED_VIRTUAL_INTR_PENDING bit
5756                  * (aka Interrupt Window Exiting) only when L1 turned it on,
5757                  * so if we got a PENDING_INTERRUPT exit, this must be for L1.
5758                  * Same for NMI Window Exiting.
5759                  */
5760                 return 1;
5761         case EXIT_REASON_TASK_SWITCH:
5762                 return 1;
5763         case EXIT_REASON_CPUID:
5764                 return 1;
5765         case EXIT_REASON_HLT:
5766                 return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);
5767         case EXIT_REASON_INVD:
5768                 return 1;
5769         case EXIT_REASON_INVLPG:
5770                 return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
5771         case EXIT_REASON_RDPMC:
5772                 return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING);
5773         case EXIT_REASON_RDTSC:
5774                 return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
5775         case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
5776         case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
5777         case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD:
5778         case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE:
5779         case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
5780                 /*
5781                  * VMX instructions trap unconditionally. This allows L1 to
5782                  * emulate them for its L2 guest, i.e., allows 3-level nesting!
5783                  */
5784                 return 1;
5785         case EXIT_REASON_CR_ACCESS:
5786                 return nested_vmx_exit_handled_cr(vcpu, vmcs12);
5787         case EXIT_REASON_DR_ACCESS:
5788                 return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING);
5789         case EXIT_REASON_IO_INSTRUCTION:
5790                 /* TODO: support IO bitmaps */
5791                 return 1;
5792         case EXIT_REASON_MSR_READ:
5793         case EXIT_REASON_MSR_WRITE:
5794                 return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason);
5795         case EXIT_REASON_INVALID_STATE:
5796                 return 1;
5797         case EXIT_REASON_MWAIT_INSTRUCTION:
5798                 return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING);
5799         case EXIT_REASON_MONITOR_INSTRUCTION:
5800                 return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING);
5801         case EXIT_REASON_PAUSE_INSTRUCTION:
5802                 return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) ||
5803                         nested_cpu_has2(vmcs12,
5804                                 SECONDARY_EXEC_PAUSE_LOOP_EXITING);
5805         case EXIT_REASON_MCE_DURING_VMENTRY:
5806                 return 0;
5807         case EXIT_REASON_TPR_BELOW_THRESHOLD:
5808                 return 1;
5809         case EXIT_REASON_APIC_ACCESS:
5810                 return nested_cpu_has2(vmcs12,
5811                         SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
5812         case EXIT_REASON_EPT_VIOLATION:
5813         case EXIT_REASON_EPT_MISCONFIG:
5814                 return 0;
5815         case EXIT_REASON_WBINVD:
5816                 return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING);
5817         case EXIT_REASON_XSETBV:
5818                 return 1;
5819         default:
5820                 return 1;
5821         }
5822 }
5823
5824 static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
5825 {
5826         *info1 = vmcs_readl(EXIT_QUALIFICATION);
5827         *info2 = vmcs_read32(VM_EXIT_INTR_INFO);
5828 }
5829
5830 /*
5831  * The guest has exited.  See if we can fix it or if we need userspace
5832  * assistance.
5833  */
5834 static int vmx_handle_exit(struct kvm_vcpu *vcpu)
5835 {
5836         struct vcpu_vmx *vmx = to_vmx(vcpu);
5837         u32 exit_reason = vmx->exit_reason;
5838         u32 vectoring_info = vmx->idt_vectoring_info;
5839
5840         /* If guest state is invalid, start emulating */
5841         if (vmx->emulation_required && emulate_invalid_guest_state)
5842                 return handle_invalid_guest_state(vcpu);
5843
5844         /*
5845          * the KVM_REQ_EVENT optimization bit is only on for one entry, and if
5846          * we did not inject a still-pending event to L1 now because of
5847          * nested_run_pending, we need to re-enable this bit.
5848          */
5849         if (vmx->nested.nested_run_pending)
5850                 kvm_make_request(KVM_REQ_EVENT, vcpu);
5851
5852         if (!is_guest_mode(vcpu) && (exit_reason == EXIT_REASON_VMLAUNCH ||
5853             exit_reason == EXIT_REASON_VMRESUME))
5854                 vmx->nested.nested_run_pending = 1;
5855         else
5856                 vmx->nested.nested_run_pending = 0;
5857
5858         if (is_guest_mode(vcpu) && nested_vmx_exit_handled(vcpu)) {
5859                 nested_vmx_vmexit(vcpu);
5860                 return 1;
5861         }
5862
5863         if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
5864                 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
5865                 vcpu->run->fail_entry.hardware_entry_failure_reason
5866                         = exit_reason;
5867                 return 0;
5868         }
5869
5870         if (unlikely(vmx->fail)) {
5871                 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
5872                 vcpu->run->fail_entry.hardware_entry_failure_reason
5873                         = vmcs_read32(VM_INSTRUCTION_ERROR);
5874                 return 0;
5875         }
5876
5877         if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
5878                         (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
5879                         exit_reason != EXIT_REASON_EPT_VIOLATION &&
5880                         exit_reason != EXIT_REASON_TASK_SWITCH))
5881                 printk(KERN_WARNING "%s: unexpected, valid vectoring info "
5882                        "(0x%x) and exit reason is 0x%x\n",
5883                        __func__, vectoring_info, exit_reason);
5884
5885         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked &&
5886             !(is_guest_mode(vcpu) && nested_cpu_has_virtual_nmis(
5887                                         get_vmcs12(vcpu), vcpu)))) {
5888                 if (vmx_interrupt_allowed(vcpu)) {
5889                         vmx->soft_vnmi_blocked = 0;
5890                 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
5891                            vcpu->arch.nmi_pending) {
5892                         /*
5893                          * This CPU don't support us in finding the end of an
5894                          * NMI-blocked window if the guest runs with IRQs
5895                          * disabled. So we pull the trigger after 1 s of
5896                          * futile waiting, but inform the user about this.
5897                          */
5898                         printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
5899                                "state on VCPU %d after 1 s timeout\n",
5900                                __func__, vcpu->vcpu_id);
5901                         vmx->soft_vnmi_blocked = 0;
5902                 }
5903         }
5904
5905         if (exit_reason < kvm_vmx_max_exit_handlers
5906             && kvm_vmx_exit_handlers[exit_reason])
5907                 return kvm_vmx_exit_handlers[exit_reason](vcpu);
5908         else {
5909                 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
5910                 vcpu->run->hw.hardware_exit_reason = exit_reason;
5911         }
5912         return 0;
5913 }
5914
5915 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
5916 {
5917         if (irr == -1 || tpr < irr) {
5918                 vmcs_write32(TPR_THRESHOLD, 0);
5919                 return;
5920         }
5921
5922         vmcs_write32(TPR_THRESHOLD, irr);
5923 }
5924
5925 static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
5926 {
5927         u32 exit_intr_info;
5928
5929         if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY
5930               || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
5931                 return;
5932
5933         vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5934         exit_intr_info = vmx->exit_intr_info;
5935
5936         /* Handle machine checks before interrupts are enabled */
5937         if (is_machine_check(exit_intr_info))
5938                 kvm_machine_check();
5939
5940         /* We need to handle NMIs before interrupts are enabled */
5941         if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
5942             (exit_intr_info & INTR_INFO_VALID_MASK)) {
5943                 kvm_before_handle_nmi(&vmx->vcpu);
5944                 asm("int $2");
5945                 kvm_after_handle_nmi(&vmx->vcpu);
5946         }
5947 }
5948
5949 static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
5950 {
5951         u32 exit_intr_info;
5952         bool unblock_nmi;
5953         u8 vector;
5954         bool idtv_info_valid;
5955
5956         idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
5957
5958         if (cpu_has_virtual_nmis()) {
5959                 if (vmx->nmi_known_unmasked)
5960                         return;
5961                 /*
5962                  * Can't use vmx->exit_intr_info since we're not sure what
5963                  * the exit reason is.
5964                  */
5965                 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5966                 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
5967                 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
5968                 /*
5969                  * SDM 3: 27.7.1.2 (September 2008)
5970                  * Re-set bit "block by NMI" before VM entry if vmexit caused by
5971                  * a guest IRET fault.
5972                  * SDM 3: 23.2.2 (September 2008)
5973                  * Bit 12 is undefined in any of the following cases:
5974                  *  If the VM exit sets the valid bit in the IDT-vectoring
5975                  *   information field.
5976                  *  If the VM exit is due to a double fault.
5977                  */
5978                 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
5979                     vector != DF_VECTOR && !idtv_info_valid)
5980                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
5981                                       GUEST_INTR_STATE_NMI);
5982                 else
5983                         vmx->nmi_known_unmasked =
5984                                 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO)
5985                                   & GUEST_INTR_STATE_NMI);
5986         } else if (unlikely(vmx->soft_vnmi_blocked))
5987                 vmx->vnmi_blocked_time +=
5988                         ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
5989 }
5990
5991 static void __vmx_complete_interrupts(struct vcpu_vmx *vmx,
5992                                       u32 idt_vectoring_info,
5993                                       int instr_len_field,
5994                                       int error_code_field)
5995 {
5996         u8 vector;
5997         int type;
5998         bool idtv_info_valid;
5999
6000         idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
6001
6002         vmx->vcpu.arch.nmi_injected = false;
6003         kvm_clear_exception_queue(&vmx->vcpu);
6004         kvm_clear_interrupt_queue(&vmx->vcpu);
6005
6006         if (!idtv_info_valid)
6007                 return;
6008
6009         kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
6010
6011         vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
6012         type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
6013
6014         switch (type) {
6015         case INTR_TYPE_NMI_INTR:
6016                 vmx->vcpu.arch.nmi_injected = true;
6017                 /*
6018                  * SDM 3: 27.7.1.2 (September 2008)
6019                  * Clear bit "block by NMI" before VM entry if a NMI
6020                  * delivery faulted.
6021                  */
6022                 vmx_set_nmi_mask(&vmx->vcpu, false);
6023                 break;
6024         case INTR_TYPE_SOFT_EXCEPTION:
6025                 vmx->vcpu.arch.event_exit_inst_len =
6026                         vmcs_read32(instr_len_field);
6027                 /* fall through */
6028         case INTR_TYPE_HARD_EXCEPTION:
6029                 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
6030                         u32 err = vmcs_read32(error_code_field);
6031                         kvm_queue_exception_e(&vmx->vcpu, vector, err);
6032                 } else
6033                         kvm_queue_exception(&vmx->vcpu, vector);
6034                 break;
6035         case INTR_TYPE_SOFT_INTR:
6036                 vmx->vcpu.arch.event_exit_inst_len =
6037                         vmcs_read32(instr_len_field);
6038                 /* fall through */
6039         case INTR_TYPE_EXT_INTR:
6040                 kvm_queue_interrupt(&vmx->vcpu, vector,
6041                         type == INTR_TYPE_SOFT_INTR);
6042                 break;
6043         default:
6044                 break;
6045         }
6046 }
6047
6048 static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
6049 {
6050         if (is_guest_mode(&vmx->vcpu))
6051                 return;
6052         __vmx_complete_interrupts(vmx, vmx->idt_vectoring_info,
6053                                   VM_EXIT_INSTRUCTION_LEN,
6054                                   IDT_VECTORING_ERROR_CODE);
6055 }
6056
6057 static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
6058 {
6059         if (is_guest_mode(vcpu))
6060                 return;
6061         __vmx_complete_interrupts(to_vmx(vcpu),
6062                                   vmcs_read32(VM_ENTRY_INTR_INFO_FIELD),
6063                                   VM_ENTRY_INSTRUCTION_LEN,
6064                                   VM_ENTRY_EXCEPTION_ERROR_CODE);
6065
6066         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
6067 }
6068
6069 static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
6070 {
6071         int i, nr_msrs;
6072         struct perf_guest_switch_msr *msrs;
6073
6074         msrs = perf_guest_get_msrs(&nr_msrs);
6075
6076         if (!msrs)
6077                 return;
6078
6079         for (i = 0; i < nr_msrs; i++)
6080                 if (msrs[i].host == msrs[i].guest)
6081                         clear_atomic_switch_msr(vmx, msrs[i].msr);
6082                 else
6083                         add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
6084                                         msrs[i].host);
6085 }
6086
6087 #ifdef CONFIG_X86_64
6088 #define R "r"
6089 #define Q "q"
6090 #else
6091 #define R "e"
6092 #define Q "l"
6093 #endif
6094
6095 static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
6096 {
6097         struct vcpu_vmx *vmx = to_vmx(vcpu);
6098
6099         if (is_guest_mode(vcpu) && !vmx->nested.nested_run_pending) {
6100                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
6101                 if (vmcs12->idt_vectoring_info_field &
6102                                 VECTORING_INFO_VALID_MASK) {
6103                         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
6104                                 vmcs12->idt_vectoring_info_field);
6105                         vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
6106                                 vmcs12->vm_exit_instruction_len);
6107                         if (vmcs12->idt_vectoring_info_field &
6108                                         VECTORING_INFO_DELIVER_CODE_MASK)
6109                                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
6110                                         vmcs12->idt_vectoring_error_code);
6111                 }
6112         }
6113
6114         /* Record the guest's net vcpu time for enforced NMI injections. */
6115         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
6116                 vmx->entry_time = ktime_get();
6117
6118         /* Don't enter VMX if guest state is invalid, let the exit handler
6119            start emulation until we arrive back to a valid state */
6120         if (vmx->emulation_required && emulate_invalid_guest_state)
6121                 return;
6122
6123         if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
6124                 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
6125         if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
6126                 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
6127
6128         /* When single-stepping over STI and MOV SS, we must clear the
6129          * corresponding interruptibility bits in the guest state. Otherwise
6130          * vmentry fails as it then expects bit 14 (BS) in pending debug
6131          * exceptions being set, but that's not correct for the guest debugging
6132          * case. */
6133         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6134                 vmx_set_interrupt_shadow(vcpu, 0);
6135
6136         atomic_switch_perf_msrs(vmx);
6137
6138         vmx->__launched = vmx->loaded_vmcs->launched;
6139         asm(
6140                 /* Store host registers */
6141                 "push %%"R"dx; push %%"R"bp;"
6142                 "push %%"R"cx \n\t" /* placeholder for guest rcx */
6143                 "push %%"R"cx \n\t"
6144                 "cmp %%"R"sp, %c[host_rsp](%0) \n\t"
6145                 "je 1f \n\t"
6146                 "mov %%"R"sp, %c[host_rsp](%0) \n\t"
6147                 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
6148                 "1: \n\t"
6149                 /* Reload cr2 if changed */
6150                 "mov %c[cr2](%0), %%"R"ax \n\t"
6151                 "mov %%cr2, %%"R"dx \n\t"
6152                 "cmp %%"R"ax, %%"R"dx \n\t"
6153                 "je 2f \n\t"
6154                 "mov %%"R"ax, %%cr2 \n\t"
6155                 "2: \n\t"
6156                 /* Check if vmlaunch of vmresume is needed */
6157                 "cmpl $0, %c[launched](%0) \n\t"
6158                 /* Load guest registers.  Don't clobber flags. */
6159                 "mov %c[rax](%0), %%"R"ax \n\t"
6160                 "mov %c[rbx](%0), %%"R"bx \n\t"
6161                 "mov %c[rdx](%0), %%"R"dx \n\t"
6162                 "mov %c[rsi](%0), %%"R"si \n\t"
6163                 "mov %c[rdi](%0), %%"R"di \n\t"
6164                 "mov %c[rbp](%0), %%"R"bp \n\t"
6165 #ifdef CONFIG_X86_64
6166                 "mov %c[r8](%0),  %%r8  \n\t"
6167                 "mov %c[r9](%0),  %%r9  \n\t"
6168                 "mov %c[r10](%0), %%r10 \n\t"
6169                 "mov %c[r11](%0), %%r11 \n\t"
6170                 "mov %c[r12](%0), %%r12 \n\t"
6171                 "mov %c[r13](%0), %%r13 \n\t"
6172                 "mov %c[r14](%0), %%r14 \n\t"
6173                 "mov %c[r15](%0), %%r15 \n\t"
6174 #endif
6175                 "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
6176
6177                 /* Enter guest mode */
6178                 "jne .Llaunched \n\t"
6179                 __ex(ASM_VMX_VMLAUNCH) "\n\t"
6180                 "jmp .Lkvm_vmx_return \n\t"
6181                 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
6182                 ".Lkvm_vmx_return: "
6183                 /* Save guest registers, load host registers, keep flags */
6184                 "mov %0, %c[wordsize](%%"R"sp) \n\t"
6185                 "pop %0 \n\t"
6186                 "mov %%"R"ax, %c[rax](%0) \n\t"
6187                 "mov %%"R"bx, %c[rbx](%0) \n\t"
6188                 "pop"Q" %c[rcx](%0) \n\t"
6189                 "mov %%"R"dx, %c[rdx](%0) \n\t"
6190                 "mov %%"R"si, %c[rsi](%0) \n\t"
6191                 "mov %%"R"di, %c[rdi](%0) \n\t"
6192                 "mov %%"R"bp, %c[rbp](%0) \n\t"
6193 #ifdef CONFIG_X86_64
6194                 "mov %%r8,  %c[r8](%0) \n\t"
6195                 "mov %%r9,  %c[r9](%0) \n\t"
6196                 "mov %%r10, %c[r10](%0) \n\t"
6197                 "mov %%r11, %c[r11](%0) \n\t"
6198                 "mov %%r12, %c[r12](%0) \n\t"
6199                 "mov %%r13, %c[r13](%0) \n\t"
6200                 "mov %%r14, %c[r14](%0) \n\t"
6201                 "mov %%r15, %c[r15](%0) \n\t"
6202 #endif
6203                 "mov %%cr2, %%"R"ax   \n\t"
6204                 "mov %%"R"ax, %c[cr2](%0) \n\t"
6205
6206                 "pop  %%"R"bp; pop  %%"R"dx \n\t"
6207                 "setbe %c[fail](%0) \n\t"
6208               : : "c"(vmx), "d"((unsigned long)HOST_RSP),
6209                 [launched]"i"(offsetof(struct vcpu_vmx, __launched)),
6210                 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
6211                 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
6212                 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
6213                 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
6214                 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
6215                 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
6216                 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
6217                 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
6218                 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
6219 #ifdef CONFIG_X86_64
6220                 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
6221                 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
6222                 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
6223                 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
6224                 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
6225                 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
6226                 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
6227                 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
6228 #endif
6229                 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)),
6230                 [wordsize]"i"(sizeof(ulong))
6231               : "cc", "memory"
6232                 , R"ax", R"bx", R"di", R"si"
6233 #ifdef CONFIG_X86_64
6234                 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
6235 #endif
6236               );
6237
6238         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
6239                                   | (1 << VCPU_EXREG_RFLAGS)
6240                                   | (1 << VCPU_EXREG_CPL)
6241                                   | (1 << VCPU_EXREG_PDPTR)
6242                                   | (1 << VCPU_EXREG_SEGMENTS)
6243                                   | (1 << VCPU_EXREG_CR3));
6244         vcpu->arch.regs_dirty = 0;
6245
6246         vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
6247
6248         if (is_guest_mode(vcpu)) {
6249                 struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
6250                 vmcs12->idt_vectoring_info_field = vmx->idt_vectoring_info;
6251                 if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
6252                         vmcs12->idt_vectoring_error_code =
6253                                 vmcs_read32(IDT_VECTORING_ERROR_CODE);
6254                         vmcs12->vm_exit_instruction_len =
6255                                 vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
6256                 }
6257         }
6258
6259         asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
6260         vmx->loaded_vmcs->launched = 1;
6261
6262         vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
6263         trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX);
6264
6265         vmx_complete_atomic_exit(vmx);
6266         vmx_recover_nmi_blocking(vmx);
6267         vmx_complete_interrupts(vmx);
6268 }
6269
6270 #undef R
6271 #undef Q
6272
6273 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
6274 {
6275         struct vcpu_vmx *vmx = to_vmx(vcpu);
6276
6277         free_vpid(vmx);
6278         free_nested(vmx);
6279         free_loaded_vmcs(vmx->loaded_vmcs);
6280         kfree(vmx->guest_msrs);
6281         kvm_vcpu_uninit(vcpu);
6282         kmem_cache_free(kvm_vcpu_cache, vmx);
6283 }
6284
6285 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
6286 {
6287         int err;
6288         struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
6289         int cpu;
6290
6291         if (!vmx)
6292                 return ERR_PTR(-ENOMEM);
6293
6294         allocate_vpid(vmx);
6295
6296         err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
6297         if (err)
6298                 goto free_vcpu;
6299
6300         vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
6301         err = -ENOMEM;
6302         if (!vmx->guest_msrs) {
6303                 goto uninit_vcpu;