KVM: nVMX: Prepare vmcs02 from vmcs01 and vmcs12
[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
22 #include <linux/kvm_host.h>
23 #include <linux/module.h>
24 #include <linux/kernel.h>
25 #include <linux/mm.h>
26 #include <linux/highmem.h>
27 #include <linux/sched.h>
28 #include <linux/moduleparam.h>
29 #include <linux/ftrace_event.h>
30 #include <linux/slab.h>
31 #include <linux/tboot.h>
32 #include "kvm_cache_regs.h"
33 #include "x86.h"
34
35 #include <asm/io.h>
36 #include <asm/desc.h>
37 #include <asm/vmx.h>
38 #include <asm/virtext.h>
39 #include <asm/mce.h>
40 #include <asm/i387.h>
41 #include <asm/xcr.h>
42
43 #include "trace.h"
44
45 #define __ex(x) __kvm_handle_fault_on_reboot(x)
46 #define __ex_clear(x, reg) \
47         ____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg)
48
49 MODULE_AUTHOR("Qumranet");
50 MODULE_LICENSE("GPL");
51
52 static int __read_mostly bypass_guest_pf = 1;
53 module_param(bypass_guest_pf, bool, S_IRUGO);
54
55 static int __read_mostly enable_vpid = 1;
56 module_param_named(vpid, enable_vpid, bool, 0444);
57
58 static int __read_mostly flexpriority_enabled = 1;
59 module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
60
61 static int __read_mostly enable_ept = 1;
62 module_param_named(ept, enable_ept, bool, S_IRUGO);
63
64 static int __read_mostly enable_unrestricted_guest = 1;
65 module_param_named(unrestricted_guest,
66                         enable_unrestricted_guest, bool, S_IRUGO);
67
68 static int __read_mostly emulate_invalid_guest_state = 0;
69 module_param(emulate_invalid_guest_state, bool, S_IRUGO);
70
71 static int __read_mostly vmm_exclusive = 1;
72 module_param(vmm_exclusive, bool, S_IRUGO);
73
74 static int __read_mostly yield_on_hlt = 1;
75 module_param(yield_on_hlt, bool, S_IRUGO);
76
77 /*
78  * If nested=1, nested virtualization is supported, i.e., guests may use
79  * VMX and be a hypervisor for its own guests. If nested=0, guests may not
80  * use VMX instructions.
81  */
82 static int __read_mostly nested = 0;
83 module_param(nested, bool, S_IRUGO);
84
85 #define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST                           \
86         (X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
87 #define KVM_GUEST_CR0_MASK                                              \
88         (KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
89 #define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST                         \
90         (X86_CR0_WP | X86_CR0_NE)
91 #define KVM_VM_CR0_ALWAYS_ON                                            \
92         (KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
93 #define KVM_CR4_GUEST_OWNED_BITS                                      \
94         (X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR      \
95          | X86_CR4_OSXMMEXCPT)
96
97 #define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
98 #define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
99
100 #define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM))
101
102 /*
103  * These 2 parameters are used to config the controls for Pause-Loop Exiting:
104  * ple_gap:    upper bound on the amount of time between two successive
105  *             executions of PAUSE in a loop. Also indicate if ple enabled.
106  *             According to test, this time is usually smaller than 128 cycles.
107  * ple_window: upper bound on the amount of time a guest is allowed to execute
108  *             in a PAUSE loop. Tests indicate that most spinlocks are held for
109  *             less than 2^12 cycles
110  * Time is measured based on a counter that runs at the same rate as the TSC,
111  * refer SDM volume 3b section 21.6.13 & 22.1.3.
112  */
113 #define KVM_VMX_DEFAULT_PLE_GAP    128
114 #define KVM_VMX_DEFAULT_PLE_WINDOW 4096
115 static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
116 module_param(ple_gap, int, S_IRUGO);
117
118 static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
119 module_param(ple_window, int, S_IRUGO);
120
121 #define NR_AUTOLOAD_MSRS 1
122 #define VMCS02_POOL_SIZE 1
123
124 struct vmcs {
125         u32 revision_id;
126         u32 abort;
127         char data[0];
128 };
129
130 /*
131  * Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also
132  * remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs
133  * loaded on this CPU (so we can clear them if the CPU goes down).
134  */
135 struct loaded_vmcs {
136         struct vmcs *vmcs;
137         int cpu;
138         int launched;
139         struct list_head loaded_vmcss_on_cpu_link;
140 };
141
142 struct shared_msr_entry {
143         unsigned index;
144         u64 data;
145         u64 mask;
146 };
147
148 /*
149  * struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a
150  * single nested guest (L2), hence the name vmcs12. Any VMX implementation has
151  * a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is
152  * stored in guest memory specified by VMPTRLD, but is opaque to the guest,
153  * which must access it using VMREAD/VMWRITE/VMCLEAR instructions.
154  * More than one of these structures may exist, if L1 runs multiple L2 guests.
155  * nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the
156  * underlying hardware which will be used to run L2.
157  * This structure is packed to ensure that its layout is identical across
158  * machines (necessary for live migration).
159  * If there are changes in this struct, VMCS12_REVISION must be changed.
160  */
161 typedef u64 natural_width;
162 struct __packed vmcs12 {
163         /* According to the Intel spec, a VMCS region must start with the
164          * following two fields. Then follow implementation-specific data.
165          */
166         u32 revision_id;
167         u32 abort;
168
169         u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
170         u32 padding[7]; /* room for future expansion */
171
172         u64 io_bitmap_a;
173         u64 io_bitmap_b;
174         u64 msr_bitmap;
175         u64 vm_exit_msr_store_addr;
176         u64 vm_exit_msr_load_addr;
177         u64 vm_entry_msr_load_addr;
178         u64 tsc_offset;
179         u64 virtual_apic_page_addr;
180         u64 apic_access_addr;
181         u64 ept_pointer;
182         u64 guest_physical_address;
183         u64 vmcs_link_pointer;
184         u64 guest_ia32_debugctl;
185         u64 guest_ia32_pat;
186         u64 guest_ia32_efer;
187         u64 guest_ia32_perf_global_ctrl;
188         u64 guest_pdptr0;
189         u64 guest_pdptr1;
190         u64 guest_pdptr2;
191         u64 guest_pdptr3;
192         u64 host_ia32_pat;
193         u64 host_ia32_efer;
194         u64 host_ia32_perf_global_ctrl;
195         u64 padding64[8]; /* room for future expansion */
196         /*
197          * To allow migration of L1 (complete with its L2 guests) between
198          * machines of different natural widths (32 or 64 bit), we cannot have
199          * unsigned long fields with no explict size. We use u64 (aliased
200          * natural_width) instead. Luckily, x86 is little-endian.
201          */
202         natural_width cr0_guest_host_mask;
203         natural_width cr4_guest_host_mask;
204         natural_width cr0_read_shadow;
205         natural_width cr4_read_shadow;
206         natural_width cr3_target_value0;
207         natural_width cr3_target_value1;
208         natural_width cr3_target_value2;
209         natural_width cr3_target_value3;
210         natural_width exit_qualification;
211         natural_width guest_linear_address;
212         natural_width guest_cr0;
213         natural_width guest_cr3;
214         natural_width guest_cr4;
215         natural_width guest_es_base;
216         natural_width guest_cs_base;
217         natural_width guest_ss_base;
218         natural_width guest_ds_base;
219         natural_width guest_fs_base;
220         natural_width guest_gs_base;
221         natural_width guest_ldtr_base;
222         natural_width guest_tr_base;
223         natural_width guest_gdtr_base;
224         natural_width guest_idtr_base;
225         natural_width guest_dr7;
226         natural_width guest_rsp;
227         natural_width guest_rip;
228         natural_width guest_rflags;
229         natural_width guest_pending_dbg_exceptions;
230         natural_width guest_sysenter_esp;
231         natural_width guest_sysenter_eip;
232         natural_width host_cr0;
233         natural_width host_cr3;
234         natural_width host_cr4;
235         natural_width host_fs_base;
236         natural_width host_gs_base;
237         natural_width host_tr_base;
238         natural_width host_gdtr_base;
239         natural_width host_idtr_base;
240         natural_width host_ia32_sysenter_esp;
241         natural_width host_ia32_sysenter_eip;
242         natural_width host_rsp;
243         natural_width host_rip;
244         natural_width paddingl[8]; /* room for future expansion */
245         u32 pin_based_vm_exec_control;
246         u32 cpu_based_vm_exec_control;
247         u32 exception_bitmap;
248         u32 page_fault_error_code_mask;
249         u32 page_fault_error_code_match;
250         u32 cr3_target_count;
251         u32 vm_exit_controls;
252         u32 vm_exit_msr_store_count;
253         u32 vm_exit_msr_load_count;
254         u32 vm_entry_controls;
255         u32 vm_entry_msr_load_count;
256         u32 vm_entry_intr_info_field;
257         u32 vm_entry_exception_error_code;
258         u32 vm_entry_instruction_len;
259         u32 tpr_threshold;
260         u32 secondary_vm_exec_control;
261         u32 vm_instruction_error;
262         u32 vm_exit_reason;
263         u32 vm_exit_intr_info;
264         u32 vm_exit_intr_error_code;
265         u32 idt_vectoring_info_field;
266         u32 idt_vectoring_error_code;
267         u32 vm_exit_instruction_len;
268         u32 vmx_instruction_info;
269         u32 guest_es_limit;
270         u32 guest_cs_limit;
271         u32 guest_ss_limit;
272         u32 guest_ds_limit;
273         u32 guest_fs_limit;
274         u32 guest_gs_limit;
275         u32 guest_ldtr_limit;
276         u32 guest_tr_limit;
277         u32 guest_gdtr_limit;
278         u32 guest_idtr_limit;
279         u32 guest_es_ar_bytes;
280         u32 guest_cs_ar_bytes;
281         u32 guest_ss_ar_bytes;
282         u32 guest_ds_ar_bytes;
283         u32 guest_fs_ar_bytes;
284         u32 guest_gs_ar_bytes;
285         u32 guest_ldtr_ar_bytes;
286         u32 guest_tr_ar_bytes;
287         u32 guest_interruptibility_info;
288         u32 guest_activity_state;
289         u32 guest_sysenter_cs;
290         u32 host_ia32_sysenter_cs;
291         u32 padding32[8]; /* room for future expansion */
292         u16 virtual_processor_id;
293         u16 guest_es_selector;
294         u16 guest_cs_selector;
295         u16 guest_ss_selector;
296         u16 guest_ds_selector;
297         u16 guest_fs_selector;
298         u16 guest_gs_selector;
299         u16 guest_ldtr_selector;
300         u16 guest_tr_selector;
301         u16 host_es_selector;
302         u16 host_cs_selector;
303         u16 host_ss_selector;
304         u16 host_ds_selector;
305         u16 host_fs_selector;
306         u16 host_gs_selector;
307         u16 host_tr_selector;
308 };
309
310 /*
311  * VMCS12_REVISION is an arbitrary id that should be changed if the content or
312  * layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
313  * VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
314  */
315 #define VMCS12_REVISION 0x11e57ed0
316
317 /*
318  * VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
319  * and any VMCS region. Although only sizeof(struct vmcs12) are used by the
320  * current implementation, 4K are reserved to avoid future complications.
321  */
322 #define VMCS12_SIZE 0x1000
323
324 /* Used to remember the last vmcs02 used for some recently used vmcs12s */
325 struct vmcs02_list {
326         struct list_head list;
327         gpa_t vmptr;
328         struct loaded_vmcs vmcs02;
329 };
330
331 /*
332  * The nested_vmx structure is part of vcpu_vmx, and holds information we need
333  * for correct emulation of VMX (i.e., nested VMX) on this vcpu.
334  */
335 struct nested_vmx {
336         /* Has the level1 guest done vmxon? */
337         bool vmxon;
338
339         /* The guest-physical address of the current VMCS L1 keeps for L2 */
340         gpa_t current_vmptr;
341         /* The host-usable pointer to the above */
342         struct page *current_vmcs12_page;
343         struct vmcs12 *current_vmcs12;
344
345         /* vmcs02_list cache of VMCSs recently used to run L2 guests */
346         struct list_head vmcs02_pool;
347         int vmcs02_num;
348         u64 vmcs01_tsc_offset;
349         /*
350          * Guest pages referred to in vmcs02 with host-physical pointers, so
351          * we must keep them pinned while L2 runs.
352          */
353         struct page *apic_access_page;
354 };
355
356 struct vcpu_vmx {
357         struct kvm_vcpu       vcpu;
358         unsigned long         host_rsp;
359         u8                    fail;
360         u8                    cpl;
361         bool                  nmi_known_unmasked;
362         u32                   exit_intr_info;
363         u32                   idt_vectoring_info;
364         ulong                 rflags;
365         struct shared_msr_entry *guest_msrs;
366         int                   nmsrs;
367         int                   save_nmsrs;
368 #ifdef CONFIG_X86_64
369         u64                   msr_host_kernel_gs_base;
370         u64                   msr_guest_kernel_gs_base;
371 #endif
372         /*
373          * loaded_vmcs points to the VMCS currently used in this vcpu. For a
374          * non-nested (L1) guest, it always points to vmcs01. For a nested
375          * guest (L2), it points to a different VMCS.
376          */
377         struct loaded_vmcs    vmcs01;
378         struct loaded_vmcs   *loaded_vmcs;
379         bool                  __launched; /* temporary, used in vmx_vcpu_run */
380         struct msr_autoload {
381                 unsigned nr;
382                 struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS];
383                 struct vmx_msr_entry host[NR_AUTOLOAD_MSRS];
384         } msr_autoload;
385         struct {
386                 int           loaded;
387                 u16           fs_sel, gs_sel, ldt_sel;
388                 int           gs_ldt_reload_needed;
389                 int           fs_reload_needed;
390         } host_state;
391         struct {
392                 int vm86_active;
393                 ulong save_rflags;
394                 struct kvm_save_segment {
395                         u16 selector;
396                         unsigned long base;
397                         u32 limit;
398                         u32 ar;
399                 } tr, es, ds, fs, gs;
400         } rmode;
401         struct {
402                 u32 bitmask; /* 4 bits per segment (1 bit per field) */
403                 struct kvm_save_segment seg[8];
404         } segment_cache;
405         int vpid;
406         bool emulation_required;
407
408         /* Support for vnmi-less CPUs */
409         int soft_vnmi_blocked;
410         ktime_t entry_time;
411         s64 vnmi_blocked_time;
412         u32 exit_reason;
413
414         bool rdtscp_enabled;
415
416         /* Support for a guest hypervisor (nested VMX) */
417         struct nested_vmx nested;
418 };
419
420 enum segment_cache_field {
421         SEG_FIELD_SEL = 0,
422         SEG_FIELD_BASE = 1,
423         SEG_FIELD_LIMIT = 2,
424         SEG_FIELD_AR = 3,
425
426         SEG_FIELD_NR = 4
427 };
428
429 static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
430 {
431         return container_of(vcpu, struct vcpu_vmx, vcpu);
432 }
433
434 #define VMCS12_OFFSET(x) offsetof(struct vmcs12, x)
435 #define FIELD(number, name)     [number] = VMCS12_OFFSET(name)
436 #define FIELD64(number, name)   [number] = VMCS12_OFFSET(name), \
437                                 [number##_HIGH] = VMCS12_OFFSET(name)+4
438
439 static unsigned short vmcs_field_to_offset_table[] = {
440         FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id),
441         FIELD(GUEST_ES_SELECTOR, guest_es_selector),
442         FIELD(GUEST_CS_SELECTOR, guest_cs_selector),
443         FIELD(GUEST_SS_SELECTOR, guest_ss_selector),
444         FIELD(GUEST_DS_SELECTOR, guest_ds_selector),
445         FIELD(GUEST_FS_SELECTOR, guest_fs_selector),
446         FIELD(GUEST_GS_SELECTOR, guest_gs_selector),
447         FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector),
448         FIELD(GUEST_TR_SELECTOR, guest_tr_selector),
449         FIELD(HOST_ES_SELECTOR, host_es_selector),
450         FIELD(HOST_CS_SELECTOR, host_cs_selector),
451         FIELD(HOST_SS_SELECTOR, host_ss_selector),
452         FIELD(HOST_DS_SELECTOR, host_ds_selector),
453         FIELD(HOST_FS_SELECTOR, host_fs_selector),
454         FIELD(HOST_GS_SELECTOR, host_gs_selector),
455         FIELD(HOST_TR_SELECTOR, host_tr_selector),
456         FIELD64(IO_BITMAP_A, io_bitmap_a),
457         FIELD64(IO_BITMAP_B, io_bitmap_b),
458         FIELD64(MSR_BITMAP, msr_bitmap),
459         FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr),
460         FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr),
461         FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr),
462         FIELD64(TSC_OFFSET, tsc_offset),
463         FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
464         FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
465         FIELD64(EPT_POINTER, ept_pointer),
466         FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address),
467         FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer),
468         FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl),
469         FIELD64(GUEST_IA32_PAT, guest_ia32_pat),
470         FIELD64(GUEST_IA32_EFER, guest_ia32_efer),
471         FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl),
472         FIELD64(GUEST_PDPTR0, guest_pdptr0),
473         FIELD64(GUEST_PDPTR1, guest_pdptr1),
474         FIELD64(GUEST_PDPTR2, guest_pdptr2),
475         FIELD64(GUEST_PDPTR3, guest_pdptr3),
476         FIELD64(HOST_IA32_PAT, host_ia32_pat),
477         FIELD64(HOST_IA32_EFER, host_ia32_efer),
478         FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl),
479         FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control),
480         FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control),
481         FIELD(EXCEPTION_BITMAP, exception_bitmap),
482         FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask),
483         FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match),
484         FIELD(CR3_TARGET_COUNT, cr3_target_count),
485         FIELD(VM_EXIT_CONTROLS, vm_exit_controls),
486         FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count),
487         FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count),
488         FIELD(VM_ENTRY_CONTROLS, vm_entry_controls),
489         FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count),
490         FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field),
491         FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code),
492         FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len),
493         FIELD(TPR_THRESHOLD, tpr_threshold),
494         FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control),
495         FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error),
496         FIELD(VM_EXIT_REASON, vm_exit_reason),
497         FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info),
498         FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code),
499         FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field),
500         FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code),
501         FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len),
502         FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info),
503         FIELD(GUEST_ES_LIMIT, guest_es_limit),
504         FIELD(GUEST_CS_LIMIT, guest_cs_limit),
505         FIELD(GUEST_SS_LIMIT, guest_ss_limit),
506         FIELD(GUEST_DS_LIMIT, guest_ds_limit),
507         FIELD(GUEST_FS_LIMIT, guest_fs_limit),
508         FIELD(GUEST_GS_LIMIT, guest_gs_limit),
509         FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit),
510         FIELD(GUEST_TR_LIMIT, guest_tr_limit),
511         FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit),
512         FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit),
513         FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes),
514         FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes),
515         FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes),
516         FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes),
517         FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes),
518         FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes),
519         FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes),
520         FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes),
521         FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info),
522         FIELD(GUEST_ACTIVITY_STATE, guest_activity_state),
523         FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs),
524         FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs),
525         FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask),
526         FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask),
527         FIELD(CR0_READ_SHADOW, cr0_read_shadow),
528         FIELD(CR4_READ_SHADOW, cr4_read_shadow),
529         FIELD(CR3_TARGET_VALUE0, cr3_target_value0),
530         FIELD(CR3_TARGET_VALUE1, cr3_target_value1),
531         FIELD(CR3_TARGET_VALUE2, cr3_target_value2),
532         FIELD(CR3_TARGET_VALUE3, cr3_target_value3),
533         FIELD(EXIT_QUALIFICATION, exit_qualification),
534         FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address),
535         FIELD(GUEST_CR0, guest_cr0),
536         FIELD(GUEST_CR3, guest_cr3),
537         FIELD(GUEST_CR4, guest_cr4),
538         FIELD(GUEST_ES_BASE, guest_es_base),
539         FIELD(GUEST_CS_BASE, guest_cs_base),
540         FIELD(GUEST_SS_BASE, guest_ss_base),
541         FIELD(GUEST_DS_BASE, guest_ds_base),
542         FIELD(GUEST_FS_BASE, guest_fs_base),
543         FIELD(GUEST_GS_BASE, guest_gs_base),
544         FIELD(GUEST_LDTR_BASE, guest_ldtr_base),
545         FIELD(GUEST_TR_BASE, guest_tr_base),
546         FIELD(GUEST_GDTR_BASE, guest_gdtr_base),
547         FIELD(GUEST_IDTR_BASE, guest_idtr_base),
548         FIELD(GUEST_DR7, guest_dr7),
549         FIELD(GUEST_RSP, guest_rsp),
550         FIELD(GUEST_RIP, guest_rip),
551         FIELD(GUEST_RFLAGS, guest_rflags),
552         FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions),
553         FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp),
554         FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip),
555         FIELD(HOST_CR0, host_cr0),
556         FIELD(HOST_CR3, host_cr3),
557         FIELD(HOST_CR4, host_cr4),
558         FIELD(HOST_FS_BASE, host_fs_base),
559         FIELD(HOST_GS_BASE, host_gs_base),
560         FIELD(HOST_TR_BASE, host_tr_base),
561         FIELD(HOST_GDTR_BASE, host_gdtr_base),
562         FIELD(HOST_IDTR_BASE, host_idtr_base),
563         FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp),
564         FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip),
565         FIELD(HOST_RSP, host_rsp),
566         FIELD(HOST_RIP, host_rip),
567 };
568 static const int max_vmcs_field = ARRAY_SIZE(vmcs_field_to_offset_table);
569
570 static inline short vmcs_field_to_offset(unsigned long field)
571 {
572         if (field >= max_vmcs_field || vmcs_field_to_offset_table[field] == 0)
573                 return -1;
574         return vmcs_field_to_offset_table[field];
575 }
576
577 static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
578 {
579         return to_vmx(vcpu)->nested.current_vmcs12;
580 }
581
582 static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr)
583 {
584         struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT);
585         if (is_error_page(page)) {
586                 kvm_release_page_clean(page);
587                 return NULL;
588         }
589         return page;
590 }
591
592 static void nested_release_page(struct page *page)
593 {
594         kvm_release_page_dirty(page);
595 }
596
597 static void nested_release_page_clean(struct page *page)
598 {
599         kvm_release_page_clean(page);
600 }
601
602 static u64 construct_eptp(unsigned long root_hpa);
603 static void kvm_cpu_vmxon(u64 addr);
604 static void kvm_cpu_vmxoff(void);
605 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
606 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
607
608 static DEFINE_PER_CPU(struct vmcs *, vmxarea);
609 static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
610 /*
611  * We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed
612  * when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it.
613  */
614 static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu);
615 static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
616
617 static unsigned long *vmx_io_bitmap_a;
618 static unsigned long *vmx_io_bitmap_b;
619 static unsigned long *vmx_msr_bitmap_legacy;
620 static unsigned long *vmx_msr_bitmap_longmode;
621
622 static bool cpu_has_load_ia32_efer;
623
624 static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
625 static DEFINE_SPINLOCK(vmx_vpid_lock);
626
627 static struct vmcs_config {
628         int size;
629         int order;
630         u32 revision_id;
631         u32 pin_based_exec_ctrl;
632         u32 cpu_based_exec_ctrl;
633         u32 cpu_based_2nd_exec_ctrl;
634         u32 vmexit_ctrl;
635         u32 vmentry_ctrl;
636 } vmcs_config;
637
638 static struct vmx_capability {
639         u32 ept;
640         u32 vpid;
641 } vmx_capability;
642
643 #define VMX_SEGMENT_FIELD(seg)                                  \
644         [VCPU_SREG_##seg] = {                                   \
645                 .selector = GUEST_##seg##_SELECTOR,             \
646                 .base = GUEST_##seg##_BASE,                     \
647                 .limit = GUEST_##seg##_LIMIT,                   \
648                 .ar_bytes = GUEST_##seg##_AR_BYTES,             \
649         }
650
651 static struct kvm_vmx_segment_field {
652         unsigned selector;
653         unsigned base;
654         unsigned limit;
655         unsigned ar_bytes;
656 } kvm_vmx_segment_fields[] = {
657         VMX_SEGMENT_FIELD(CS),
658         VMX_SEGMENT_FIELD(DS),
659         VMX_SEGMENT_FIELD(ES),
660         VMX_SEGMENT_FIELD(FS),
661         VMX_SEGMENT_FIELD(GS),
662         VMX_SEGMENT_FIELD(SS),
663         VMX_SEGMENT_FIELD(TR),
664         VMX_SEGMENT_FIELD(LDTR),
665 };
666
667 static u64 host_efer;
668
669 static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
670
671 /*
672  * Keep MSR_STAR at the end, as setup_msrs() will try to optimize it
673  * away by decrementing the array size.
674  */
675 static const u32 vmx_msr_index[] = {
676 #ifdef CONFIG_X86_64
677         MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR,
678 #endif
679         MSR_EFER, MSR_TSC_AUX, MSR_STAR,
680 };
681 #define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
682
683 static inline bool is_page_fault(u32 intr_info)
684 {
685         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
686                              INTR_INFO_VALID_MASK)) ==
687                 (INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
688 }
689
690 static inline bool is_no_device(u32 intr_info)
691 {
692         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
693                              INTR_INFO_VALID_MASK)) ==
694                 (INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
695 }
696
697 static inline bool is_invalid_opcode(u32 intr_info)
698 {
699         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
700                              INTR_INFO_VALID_MASK)) ==
701                 (INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
702 }
703
704 static inline bool is_external_interrupt(u32 intr_info)
705 {
706         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
707                 == (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
708 }
709
710 static inline bool is_machine_check(u32 intr_info)
711 {
712         return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
713                              INTR_INFO_VALID_MASK)) ==
714                 (INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
715 }
716
717 static inline bool cpu_has_vmx_msr_bitmap(void)
718 {
719         return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
720 }
721
722 static inline bool cpu_has_vmx_tpr_shadow(void)
723 {
724         return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
725 }
726
727 static inline bool vm_need_tpr_shadow(struct kvm *kvm)
728 {
729         return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
730 }
731
732 static inline bool cpu_has_secondary_exec_ctrls(void)
733 {
734         return vmcs_config.cpu_based_exec_ctrl &
735                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
736 }
737
738 static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
739 {
740         return vmcs_config.cpu_based_2nd_exec_ctrl &
741                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
742 }
743
744 static inline bool cpu_has_vmx_flexpriority(void)
745 {
746         return cpu_has_vmx_tpr_shadow() &&
747                 cpu_has_vmx_virtualize_apic_accesses();
748 }
749
750 static inline bool cpu_has_vmx_ept_execute_only(void)
751 {
752         return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT;
753 }
754
755 static inline bool cpu_has_vmx_eptp_uncacheable(void)
756 {
757         return vmx_capability.ept & VMX_EPTP_UC_BIT;
758 }
759
760 static inline bool cpu_has_vmx_eptp_writeback(void)
761 {
762         return vmx_capability.ept & VMX_EPTP_WB_BIT;
763 }
764
765 static inline bool cpu_has_vmx_ept_2m_page(void)
766 {
767         return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT;
768 }
769
770 static inline bool cpu_has_vmx_ept_1g_page(void)
771 {
772         return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
773 }
774
775 static inline bool cpu_has_vmx_ept_4levels(void)
776 {
777         return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
778 }
779
780 static inline bool cpu_has_vmx_invept_individual_addr(void)
781 {
782         return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
783 }
784
785 static inline bool cpu_has_vmx_invept_context(void)
786 {
787         return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT;
788 }
789
790 static inline bool cpu_has_vmx_invept_global(void)
791 {
792         return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT;
793 }
794
795 static inline bool cpu_has_vmx_invvpid_single(void)
796 {
797         return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
798 }
799
800 static inline bool cpu_has_vmx_invvpid_global(void)
801 {
802         return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
803 }
804
805 static inline bool cpu_has_vmx_ept(void)
806 {
807         return vmcs_config.cpu_based_2nd_exec_ctrl &
808                 SECONDARY_EXEC_ENABLE_EPT;
809 }
810
811 static inline bool cpu_has_vmx_unrestricted_guest(void)
812 {
813         return vmcs_config.cpu_based_2nd_exec_ctrl &
814                 SECONDARY_EXEC_UNRESTRICTED_GUEST;
815 }
816
817 static inline bool cpu_has_vmx_ple(void)
818 {
819         return vmcs_config.cpu_based_2nd_exec_ctrl &
820                 SECONDARY_EXEC_PAUSE_LOOP_EXITING;
821 }
822
823 static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm)
824 {
825         return flexpriority_enabled && irqchip_in_kernel(kvm);
826 }
827
828 static inline bool cpu_has_vmx_vpid(void)
829 {
830         return vmcs_config.cpu_based_2nd_exec_ctrl &
831                 SECONDARY_EXEC_ENABLE_VPID;
832 }
833
834 static inline bool cpu_has_vmx_rdtscp(void)
835 {
836         return vmcs_config.cpu_based_2nd_exec_ctrl &
837                 SECONDARY_EXEC_RDTSCP;
838 }
839
840 static inline bool cpu_has_virtual_nmis(void)
841 {
842         return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
843 }
844
845 static inline bool cpu_has_vmx_wbinvd_exit(void)
846 {
847         return vmcs_config.cpu_based_2nd_exec_ctrl &
848                 SECONDARY_EXEC_WBINVD_EXITING;
849 }
850
851 static inline bool report_flexpriority(void)
852 {
853         return flexpriority_enabled;
854 }
855
856 static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
857 {
858         return vmcs12->cpu_based_vm_exec_control & bit;
859 }
860
861 static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit)
862 {
863         return (vmcs12->cpu_based_vm_exec_control &
864                         CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
865                 (vmcs12->secondary_vm_exec_control & bit);
866 }
867
868 static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
869 {
870         int i;
871
872         for (i = 0; i < vmx->nmsrs; ++i)
873                 if (vmx_msr_index[vmx->guest_msrs[i].index] == msr)
874                         return i;
875         return -1;
876 }
877
878 static inline void __invvpid(int ext, u16 vpid, gva_t gva)
879 {
880     struct {
881         u64 vpid : 16;
882         u64 rsvd : 48;
883         u64 gva;
884     } operand = { vpid, 0, gva };
885
886     asm volatile (__ex(ASM_VMX_INVVPID)
887                   /* CF==1 or ZF==1 --> rc = -1 */
888                   "; ja 1f ; ud2 ; 1:"
889                   : : "a"(&operand), "c"(ext) : "cc", "memory");
890 }
891
892 static inline void __invept(int ext, u64 eptp, gpa_t gpa)
893 {
894         struct {
895                 u64 eptp, gpa;
896         } operand = {eptp, gpa};
897
898         asm volatile (__ex(ASM_VMX_INVEPT)
899                         /* CF==1 or ZF==1 --> rc = -1 */
900                         "; ja 1f ; ud2 ; 1:\n"
901                         : : "a" (&operand), "c" (ext) : "cc", "memory");
902 }
903
904 static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
905 {
906         int i;
907
908         i = __find_msr_index(vmx, msr);
909         if (i >= 0)
910                 return &vmx->guest_msrs[i];
911         return NULL;
912 }
913
914 static void vmcs_clear(struct vmcs *vmcs)
915 {
916         u64 phys_addr = __pa(vmcs);
917         u8 error;
918
919         asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
920                       : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
921                       : "cc", "memory");
922         if (error)
923                 printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
924                        vmcs, phys_addr);
925 }
926
927 static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
928 {
929         vmcs_clear(loaded_vmcs->vmcs);
930         loaded_vmcs->cpu = -1;
931         loaded_vmcs->launched = 0;
932 }
933
934 static void vmcs_load(struct vmcs *vmcs)
935 {
936         u64 phys_addr = __pa(vmcs);
937         u8 error;
938
939         asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
940                         : "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
941                         : "cc", "memory");
942         if (error)
943                 printk(KERN_ERR "kvm: vmptrld %p/%llx fail\n",
944                        vmcs, phys_addr);
945 }
946
947 static void __loaded_vmcs_clear(void *arg)
948 {
949         struct loaded_vmcs *loaded_vmcs = arg;
950         int cpu = raw_smp_processor_id();
951
952         if (loaded_vmcs->cpu != cpu)
953                 return; /* vcpu migration can race with cpu offline */
954         if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs)
955                 per_cpu(current_vmcs, cpu) = NULL;
956         list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link);
957         loaded_vmcs_init(loaded_vmcs);
958 }
959
960 static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs)
961 {
962         if (loaded_vmcs->cpu != -1)
963                 smp_call_function_single(
964                         loaded_vmcs->cpu, __loaded_vmcs_clear, loaded_vmcs, 1);
965 }
966
967 static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx)
968 {
969         if (vmx->vpid == 0)
970                 return;
971
972         if (cpu_has_vmx_invvpid_single())
973                 __invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
974 }
975
976 static inline void vpid_sync_vcpu_global(void)
977 {
978         if (cpu_has_vmx_invvpid_global())
979                 __invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
980 }
981
982 static inline void vpid_sync_context(struct vcpu_vmx *vmx)
983 {
984         if (cpu_has_vmx_invvpid_single())
985                 vpid_sync_vcpu_single(vmx);
986         else
987                 vpid_sync_vcpu_global();
988 }
989
990 static inline void ept_sync_global(void)
991 {
992         if (cpu_has_vmx_invept_global())
993                 __invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
994 }
995
996 static inline void ept_sync_context(u64 eptp)
997 {
998         if (enable_ept) {
999                 if (cpu_has_vmx_invept_context())
1000                         __invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
1001                 else
1002                         ept_sync_global();
1003         }
1004 }
1005
1006 static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
1007 {
1008         if (enable_ept) {
1009                 if (cpu_has_vmx_invept_individual_addr())
1010                         __invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
1011                                         eptp, gpa);
1012                 else
1013                         ept_sync_context(eptp);
1014         }
1015 }
1016
1017 static __always_inline unsigned long vmcs_readl(unsigned long field)
1018 {
1019         unsigned long value;
1020
1021         asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0")
1022                       : "=a"(value) : "d"(field) : "cc");
1023         return value;
1024 }
1025
1026 static __always_inline u16 vmcs_read16(unsigned long field)
1027 {
1028         return vmcs_readl(field);
1029 }
1030
1031 static __always_inline u32 vmcs_read32(unsigned long field)
1032 {
1033         return vmcs_readl(field);
1034 }
1035
1036 static __always_inline u64 vmcs_read64(unsigned long field)
1037 {
1038 #ifdef CONFIG_X86_64
1039         return vmcs_readl(field);
1040 #else
1041         return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
1042 #endif
1043 }
1044
1045 static noinline void vmwrite_error(unsigned long field, unsigned long value)
1046 {
1047         printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
1048                field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
1049         dump_stack();
1050 }
1051
1052 static void vmcs_writel(unsigned long field, unsigned long value)
1053 {
1054         u8 error;
1055
1056         asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
1057                        : "=q"(error) : "a"(value), "d"(field) : "cc");
1058         if (unlikely(error))
1059                 vmwrite_error(field, value);
1060 }
1061
1062 static void vmcs_write16(unsigned long field, u16 value)
1063 {
1064         vmcs_writel(field, value);
1065 }
1066
1067 static void vmcs_write32(unsigned long field, u32 value)
1068 {
1069         vmcs_writel(field, value);
1070 }
1071
1072 static void vmcs_write64(unsigned long field, u64 value)
1073 {
1074         vmcs_writel(field, value);
1075 #ifndef CONFIG_X86_64
1076         asm volatile ("");
1077         vmcs_writel(field+1, value >> 32);
1078 #endif
1079 }
1080
1081 static void vmcs_clear_bits(unsigned long field, u32 mask)
1082 {
1083         vmcs_writel(field, vmcs_readl(field) & ~mask);
1084 }
1085
1086 static void vmcs_set_bits(unsigned long field, u32 mask)
1087 {
1088         vmcs_writel(field, vmcs_readl(field) | mask);
1089 }
1090
1091 static void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
1092 {
1093         vmx->segment_cache.bitmask = 0;
1094 }
1095
1096 static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg,
1097                                        unsigned field)
1098 {
1099         bool ret;
1100         u32 mask = 1 << (seg * SEG_FIELD_NR + field);
1101
1102         if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) {
1103                 vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS);
1104                 vmx->segment_cache.bitmask = 0;
1105         }
1106         ret = vmx->segment_cache.bitmask & mask;
1107         vmx->segment_cache.bitmask |= mask;
1108         return ret;
1109 }
1110
1111 static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg)
1112 {
1113         u16 *p = &vmx->segment_cache.seg[seg].selector;
1114
1115         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL))
1116                 *p = vmcs_read16(kvm_vmx_segment_fields[seg].selector);
1117         return *p;
1118 }
1119
1120 static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg)
1121 {
1122         ulong *p = &vmx->segment_cache.seg[seg].base;
1123
1124         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE))
1125                 *p = vmcs_readl(kvm_vmx_segment_fields[seg].base);
1126         return *p;
1127 }
1128
1129 static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg)
1130 {
1131         u32 *p = &vmx->segment_cache.seg[seg].limit;
1132
1133         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT))
1134                 *p = vmcs_read32(kvm_vmx_segment_fields[seg].limit);
1135         return *p;
1136 }
1137
1138 static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg)
1139 {
1140         u32 *p = &vmx->segment_cache.seg[seg].ar;
1141
1142         if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR))
1143                 *p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes);
1144         return *p;
1145 }
1146
1147 static void update_exception_bitmap(struct kvm_vcpu *vcpu)
1148 {
1149         u32 eb;
1150
1151         eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) |
1152              (1u << NM_VECTOR) | (1u << DB_VECTOR);
1153         if ((vcpu->guest_debug &
1154              (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) ==
1155             (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP))
1156                 eb |= 1u << BP_VECTOR;
1157         if (to_vmx(vcpu)->rmode.vm86_active)
1158                 eb = ~0;
1159         if (enable_ept)
1160                 eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
1161         if (vcpu->fpu_active)
1162                 eb &= ~(1u << NM_VECTOR);
1163         vmcs_write32(EXCEPTION_BITMAP, eb);
1164 }
1165
1166 static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
1167 {
1168         unsigned i;
1169         struct msr_autoload *m = &vmx->msr_autoload;
1170
1171         if (msr == MSR_EFER && cpu_has_load_ia32_efer) {
1172                 vmcs_clear_bits(VM_ENTRY_CONTROLS, VM_ENTRY_LOAD_IA32_EFER);
1173                 vmcs_clear_bits(VM_EXIT_CONTROLS, VM_EXIT_LOAD_IA32_EFER);
1174                 return;
1175         }
1176
1177         for (i = 0; i < m->nr; ++i)
1178                 if (m->guest[i].index == msr)
1179                         break;
1180
1181         if (i == m->nr)
1182                 return;
1183         --m->nr;
1184         m->guest[i] = m->guest[m->nr];
1185         m->host[i] = m->host[m->nr];
1186         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
1187         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
1188 }
1189
1190 static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
1191                                   u64 guest_val, u64 host_val)
1192 {
1193         unsigned i;
1194         struct msr_autoload *m = &vmx->msr_autoload;
1195
1196         if (msr == MSR_EFER && cpu_has_load_ia32_efer) {
1197                 vmcs_write64(GUEST_IA32_EFER, guest_val);
1198                 vmcs_write64(HOST_IA32_EFER, host_val);
1199                 vmcs_set_bits(VM_ENTRY_CONTROLS, VM_ENTRY_LOAD_IA32_EFER);
1200                 vmcs_set_bits(VM_EXIT_CONTROLS, VM_EXIT_LOAD_IA32_EFER);
1201                 return;
1202         }
1203
1204         for (i = 0; i < m->nr; ++i)
1205                 if (m->guest[i].index == msr)
1206                         break;
1207
1208         if (i == m->nr) {
1209                 ++m->nr;
1210                 vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
1211                 vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
1212         }
1213
1214         m->guest[i].index = msr;
1215         m->guest[i].value = guest_val;
1216         m->host[i].index = msr;
1217         m->host[i].value = host_val;
1218 }
1219
1220 static void reload_tss(void)
1221 {
1222         /*
1223          * VT restores TR but not its size.  Useless.
1224          */
1225         struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
1226         struct desc_struct *descs;
1227
1228         descs = (void *)gdt->address;
1229         descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
1230         load_TR_desc();
1231 }
1232
1233 static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
1234 {
1235         u64 guest_efer;
1236         u64 ignore_bits;
1237
1238         guest_efer = vmx->vcpu.arch.efer;
1239
1240         /*
1241          * NX is emulated; LMA and LME handled by hardware; SCE meaninless
1242          * outside long mode
1243          */
1244         ignore_bits = EFER_NX | EFER_SCE;
1245 #ifdef CONFIG_X86_64
1246         ignore_bits |= EFER_LMA | EFER_LME;
1247         /* SCE is meaningful only in long mode on Intel */
1248         if (guest_efer & EFER_LMA)
1249                 ignore_bits &= ~(u64)EFER_SCE;
1250 #endif
1251         guest_efer &= ~ignore_bits;
1252         guest_efer |= host_efer & ignore_bits;
1253         vmx->guest_msrs[efer_offset].data = guest_efer;
1254         vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
1255
1256         clear_atomic_switch_msr(vmx, MSR_EFER);
1257         /* On ept, can't emulate nx, and must switch nx atomically */
1258         if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) {
1259                 guest_efer = vmx->vcpu.arch.efer;
1260                 if (!(guest_efer & EFER_LMA))
1261                         guest_efer &= ~EFER_LME;
1262                 add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer);
1263                 return false;
1264         }
1265
1266         return true;
1267 }
1268
1269 static unsigned long segment_base(u16 selector)
1270 {
1271         struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
1272         struct desc_struct *d;
1273         unsigned long table_base;
1274         unsigned long v;
1275
1276         if (!(selector & ~3))
1277                 return 0;
1278
1279         table_base = gdt->address;
1280
1281         if (selector & 4) {           /* from ldt */
1282                 u16 ldt_selector = kvm_read_ldt();
1283
1284                 if (!(ldt_selector & ~3))
1285                         return 0;
1286
1287                 table_base = segment_base(ldt_selector);
1288         }
1289         d = (struct desc_struct *)(table_base + (selector & ~7));
1290         v = get_desc_base(d);
1291 #ifdef CONFIG_X86_64
1292        if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
1293                v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
1294 #endif
1295         return v;
1296 }
1297
1298 static inline unsigned long kvm_read_tr_base(void)
1299 {
1300         u16 tr;
1301         asm("str %0" : "=g"(tr));
1302         return segment_base(tr);
1303 }
1304
1305 static void vmx_save_host_state(struct kvm_vcpu *vcpu)
1306 {
1307         struct vcpu_vmx *vmx = to_vmx(vcpu);
1308         int i;
1309
1310         if (vmx->host_state.loaded)
1311                 return;
1312
1313         vmx->host_state.loaded = 1;
1314         /*
1315          * Set host fs and gs selectors.  Unfortunately, 22.2.3 does not
1316          * allow segment selectors with cpl > 0 or ti == 1.
1317          */
1318         vmx->host_state.ldt_sel = kvm_read_ldt();
1319         vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
1320         savesegment(fs, vmx->host_state.fs_sel);
1321         if (!(vmx->host_state.fs_sel & 7)) {
1322                 vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
1323                 vmx->host_state.fs_reload_needed = 0;
1324         } else {
1325                 vmcs_write16(HOST_FS_SELECTOR, 0);
1326                 vmx->host_state.fs_reload_needed = 1;
1327         }
1328         savesegment(gs, vmx->host_state.gs_sel);
1329         if (!(vmx->host_state.gs_sel & 7))
1330                 vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
1331         else {
1332                 vmcs_write16(HOST_GS_SELECTOR, 0);
1333                 vmx->host_state.gs_ldt_reload_needed = 1;
1334         }
1335
1336 #ifdef CONFIG_X86_64
1337         vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
1338         vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
1339 #else
1340         vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
1341         vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
1342 #endif
1343
1344 #ifdef CONFIG_X86_64
1345         rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
1346         if (is_long_mode(&vmx->vcpu))
1347                 wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
1348 #endif
1349         for (i = 0; i < vmx->save_nmsrs; ++i)
1350                 kvm_set_shared_msr(vmx->guest_msrs[i].index,
1351                                    vmx->guest_msrs[i].data,
1352                                    vmx->guest_msrs[i].mask);
1353 }
1354
1355 static void __vmx_load_host_state(struct vcpu_vmx *vmx)
1356 {
1357         if (!vmx->host_state.loaded)
1358                 return;
1359
1360         ++vmx->vcpu.stat.host_state_reload;
1361         vmx->host_state.loaded = 0;
1362 #ifdef CONFIG_X86_64
1363         if (is_long_mode(&vmx->vcpu))
1364                 rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
1365 #endif
1366         if (vmx->host_state.gs_ldt_reload_needed) {
1367                 kvm_load_ldt(vmx->host_state.ldt_sel);
1368 #ifdef CONFIG_X86_64
1369                 load_gs_index(vmx->host_state.gs_sel);
1370 #else
1371                 loadsegment(gs, vmx->host_state.gs_sel);
1372 #endif
1373         }
1374         if (vmx->host_state.fs_reload_needed)
1375                 loadsegment(fs, vmx->host_state.fs_sel);
1376         reload_tss();
1377 #ifdef CONFIG_X86_64
1378         wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
1379 #endif
1380         if (current_thread_info()->status & TS_USEDFPU)
1381                 clts();
1382         load_gdt(&__get_cpu_var(host_gdt));
1383 }
1384
1385 static void vmx_load_host_state(struct vcpu_vmx *vmx)
1386 {
1387         preempt_disable();
1388         __vmx_load_host_state(vmx);
1389         preempt_enable();
1390 }
1391
1392 /*
1393  * Switches to specified vcpu, until a matching vcpu_put(), but assumes
1394  * vcpu mutex is already taken.
1395  */
1396 static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1397 {
1398         struct vcpu_vmx *vmx = to_vmx(vcpu);
1399         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
1400
1401         if (!vmm_exclusive)
1402                 kvm_cpu_vmxon(phys_addr);
1403         else if (vmx->loaded_vmcs->cpu != cpu)
1404                 loaded_vmcs_clear(vmx->loaded_vmcs);
1405
1406         if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) {
1407                 per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs;
1408                 vmcs_load(vmx->loaded_vmcs->vmcs);
1409         }
1410
1411         if (vmx->loaded_vmcs->cpu != cpu) {
1412                 struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
1413                 unsigned long sysenter_esp;
1414
1415                 kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
1416                 local_irq_disable();
1417                 list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link,
1418                          &per_cpu(loaded_vmcss_on_cpu, cpu));
1419                 local_irq_enable();
1420
1421                 /*
1422                  * Linux uses per-cpu TSS and GDT, so set these when switching
1423                  * processors.
1424                  */
1425                 vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
1426                 vmcs_writel(HOST_GDTR_BASE, gdt->address);   /* 22.2.4 */
1427
1428                 rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
1429                 vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
1430                 vmx->loaded_vmcs->cpu = cpu;
1431         }
1432 }
1433
1434 static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
1435 {
1436         __vmx_load_host_state(to_vmx(vcpu));
1437         if (!vmm_exclusive) {
1438                 __loaded_vmcs_clear(to_vmx(vcpu)->loaded_vmcs);
1439                 vcpu->cpu = -1;
1440                 kvm_cpu_vmxoff();
1441         }
1442 }
1443
1444 static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
1445 {
1446         ulong cr0;
1447
1448         if (vcpu->fpu_active)
1449                 return;
1450         vcpu->fpu_active = 1;
1451         cr0 = vmcs_readl(GUEST_CR0);
1452         cr0 &= ~(X86_CR0_TS | X86_CR0_MP);
1453         cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP);
1454         vmcs_writel(GUEST_CR0, cr0);
1455         update_exception_bitmap(vcpu);
1456         vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
1457         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
1458 }
1459
1460 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);
1461
1462 /*
1463  * Return the cr0 value that a nested guest would read. This is a combination
1464  * of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by
1465  * its hypervisor (cr0_read_shadow).
1466  */
1467 static inline unsigned long nested_read_cr0(struct vmcs12 *fields)
1468 {
1469         return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) |
1470                 (fields->cr0_read_shadow & fields->cr0_guest_host_mask);
1471 }
1472 static inline unsigned long nested_read_cr4(struct vmcs12 *fields)
1473 {
1474         return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) |
1475                 (fields->cr4_read_shadow & fields->cr4_guest_host_mask);
1476 }
1477
1478 static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
1479 {
1480         vmx_decache_cr0_guest_bits(vcpu);
1481         vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP);
1482         update_exception_bitmap(vcpu);
1483         vcpu->arch.cr0_guest_owned_bits = 0;
1484         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
1485         vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
1486 }
1487
1488 static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
1489 {
1490         unsigned long rflags, save_rflags;
1491
1492         if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) {
1493                 __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
1494                 rflags = vmcs_readl(GUEST_RFLAGS);
1495                 if (to_vmx(vcpu)->rmode.vm86_active) {
1496                         rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
1497                         save_rflags = to_vmx(vcpu)->rmode.save_rflags;
1498                         rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
1499                 }
1500                 to_vmx(vcpu)->rflags = rflags;
1501         }
1502         return to_vmx(vcpu)->rflags;
1503 }
1504
1505 static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
1506 {
1507         __set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
1508         __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
1509         to_vmx(vcpu)->rflags = rflags;
1510         if (to_vmx(vcpu)->rmode.vm86_active) {
1511                 to_vmx(vcpu)->rmode.save_rflags = rflags;
1512                 rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
1513         }
1514         vmcs_writel(GUEST_RFLAGS, rflags);
1515 }
1516
1517 static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
1518 {
1519         u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
1520         int ret = 0;
1521
1522         if (interruptibility & GUEST_INTR_STATE_STI)
1523                 ret |= KVM_X86_SHADOW_INT_STI;
1524         if (interruptibility & GUEST_INTR_STATE_MOV_SS)
1525                 ret |= KVM_X86_SHADOW_INT_MOV_SS;
1526
1527         return ret & mask;
1528 }
1529
1530 static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
1531 {
1532         u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
1533         u32 interruptibility = interruptibility_old;
1534
1535         interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
1536
1537         if (mask & KVM_X86_SHADOW_INT_MOV_SS)
1538                 interruptibility |= GUEST_INTR_STATE_MOV_SS;
1539         else if (mask & KVM_X86_SHADOW_INT_STI)
1540                 interruptibility |= GUEST_INTR_STATE_STI;
1541
1542         if ((interruptibility != interruptibility_old))
1543                 vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
1544 }
1545
1546 static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
1547 {
1548         unsigned long rip;
1549
1550         rip = kvm_rip_read(vcpu);
1551         rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
1552         kvm_rip_write(vcpu, rip);
1553
1554         /* skipping an emulated instruction also counts */
1555         vmx_set_interrupt_shadow(vcpu, 0);
1556 }
1557
1558 static void vmx_clear_hlt(struct kvm_vcpu *vcpu)
1559 {
1560         /* Ensure that we clear the HLT state in the VMCS.  We don't need to
1561          * explicitly skip the instruction because if the HLT state is set, then
1562          * the instruction is already executing and RIP has already been
1563          * advanced. */
1564         if (!yield_on_hlt &&
1565             vmcs_read32(GUEST_ACTIVITY_STATE) == GUEST_ACTIVITY_HLT)
1566                 vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
1567 }
1568
1569 static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
1570                                 bool has_error_code, u32 error_code,
1571                                 bool reinject)
1572 {
1573         struct vcpu_vmx *vmx = to_vmx(vcpu);
1574         u32 intr_info = nr | INTR_INFO_VALID_MASK;
1575
1576         if (has_error_code) {
1577                 vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
1578                 intr_info |= INTR_INFO_DELIVER_CODE_MASK;
1579         }
1580
1581         if (vmx->rmode.vm86_active) {
1582                 int inc_eip = 0;
1583                 if (kvm_exception_is_soft(nr))
1584                         inc_eip = vcpu->arch.event_exit_inst_len;
1585                 if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE)
1586                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
1587                 return;
1588         }
1589
1590         if (kvm_exception_is_soft(nr)) {
1591                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
1592                              vmx->vcpu.arch.event_exit_inst_len);
1593                 intr_info |= INTR_TYPE_SOFT_EXCEPTION;
1594         } else
1595                 intr_info |= INTR_TYPE_HARD_EXCEPTION;
1596
1597         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
1598         vmx_clear_hlt(vcpu);
1599 }
1600
1601 static bool vmx_rdtscp_supported(void)
1602 {
1603         return cpu_has_vmx_rdtscp();
1604 }
1605
1606 /*
1607  * Swap MSR entry in host/guest MSR entry array.
1608  */
1609 static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
1610 {
1611         struct shared_msr_entry tmp;
1612
1613         tmp = vmx->guest_msrs[to];
1614         vmx->guest_msrs[to] = vmx->guest_msrs[from];
1615         vmx->guest_msrs[from] = tmp;
1616 }
1617
1618 /*
1619  * Set up the vmcs to automatically save and restore system
1620  * msrs.  Don't touch the 64-bit msrs if the guest is in legacy
1621  * mode, as fiddling with msrs is very expensive.
1622  */
1623 static void setup_msrs(struct vcpu_vmx *vmx)
1624 {
1625         int save_nmsrs, index;
1626         unsigned long *msr_bitmap;
1627
1628         vmx_load_host_state(vmx);
1629         save_nmsrs = 0;
1630 #ifdef CONFIG_X86_64
1631         if (is_long_mode(&vmx->vcpu)) {
1632                 index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
1633                 if (index >= 0)
1634                         move_msr_up(vmx, index, save_nmsrs++);
1635                 index = __find_msr_index(vmx, MSR_LSTAR);
1636                 if (index >= 0)
1637                         move_msr_up(vmx, index, save_nmsrs++);
1638                 index = __find_msr_index(vmx, MSR_CSTAR);
1639                 if (index >= 0)
1640                         move_msr_up(vmx, index, save_nmsrs++);
1641                 index = __find_msr_index(vmx, MSR_TSC_AUX);
1642                 if (index >= 0 && vmx->rdtscp_enabled)
1643                         move_msr_up(vmx, index, save_nmsrs++);
1644                 /*
1645                  * MSR_STAR is only needed on long mode guests, and only
1646                  * if efer.sce is enabled.
1647                  */
1648                 index = __find_msr_index(vmx, MSR_STAR);
1649                 if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE))
1650                         move_msr_up(vmx, index, save_nmsrs++);
1651         }
1652 #endif
1653         index = __find_msr_index(vmx, MSR_EFER);
1654         if (index >= 0 && update_transition_efer(vmx, index))
1655                 move_msr_up(vmx, index, save_nmsrs++);
1656
1657         vmx->save_nmsrs = save_nmsrs;
1658
1659         if (cpu_has_vmx_msr_bitmap()) {
1660                 if (is_long_mode(&vmx->vcpu))
1661                         msr_bitmap = vmx_msr_bitmap_longmode;
1662                 else
1663                         msr_bitmap = vmx_msr_bitmap_legacy;
1664
1665                 vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
1666         }
1667 }
1668
1669 /*
1670  * reads and returns guest's timestamp counter "register"
1671  * guest_tsc = host_tsc + tsc_offset    -- 21.3
1672  */
1673 static u64 guest_read_tsc(void)
1674 {
1675         u64 host_tsc, tsc_offset;
1676
1677         rdtscll(host_tsc);
1678         tsc_offset = vmcs_read64(TSC_OFFSET);
1679         return host_tsc + tsc_offset;
1680 }
1681
1682 /*
1683  * Empty call-back. Needs to be implemented when VMX enables the SET_TSC_KHZ
1684  * ioctl. In this case the call-back should update internal vmx state to make
1685  * the changes effective.
1686  */
1687 static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
1688 {
1689         /* Nothing to do here */
1690 }
1691
1692 /*
1693  * writes 'offset' into guest's timestamp counter offset register
1694  */
1695 static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
1696 {
1697         vmcs_write64(TSC_OFFSET, offset);
1698 }
1699
1700 static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
1701 {
1702         u64 offset = vmcs_read64(TSC_OFFSET);
1703         vmcs_write64(TSC_OFFSET, offset + adjustment);
1704 }
1705
1706 static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
1707 {
1708         return target_tsc - native_read_tsc();
1709 }
1710
1711 static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu)
1712 {
1713         struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 1, 0);
1714         return best && (best->ecx & (1 << (X86_FEATURE_VMX & 31)));
1715 }
1716
1717 /*
1718  * nested_vmx_allowed() checks whether a guest should be allowed to use VMX
1719  * instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for
1720  * all guests if the "nested" module option is off, and can also be disabled
1721  * for a single guest by disabling its VMX cpuid bit.
1722  */
1723 static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu)
1724 {
1725         return nested && guest_cpuid_has_vmx(vcpu);
1726 }
1727
1728 /*
1729  * nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
1730  * returned for the various VMX controls MSRs when nested VMX is enabled.
1731  * The same values should also be used to verify that vmcs12 control fields are
1732  * valid during nested entry from L1 to L2.
1733  * Each of these control msrs has a low and high 32-bit half: A low bit is on
1734  * if the corresponding bit in the (32-bit) control field *must* be on, and a
1735  * bit in the high half is on if the corresponding bit in the control field
1736  * may be on. See also vmx_control_verify().
1737  * TODO: allow these variables to be modified (downgraded) by module options
1738  * or other means.
1739  */
1740 static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high;
1741 static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high;
1742 static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high;
1743 static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high;
1744 static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high;
1745 static __init void nested_vmx_setup_ctls_msrs(void)
1746 {
1747         /*
1748          * Note that as a general rule, the high half of the MSRs (bits in
1749          * the control fields which may be 1) should be initialized by the
1750          * intersection of the underlying hardware's MSR (i.e., features which
1751          * can be supported) and the list of features we want to expose -
1752          * because they are known to be properly supported in our code.
1753          * Also, usually, the low half of the MSRs (bits which must be 1) can
1754          * be set to 0, meaning that L1 may turn off any of these bits. The
1755          * reason is that if one of these bits is necessary, it will appear
1756          * in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
1757          * fields of vmcs01 and vmcs02, will turn these bits off - and
1758          * nested_vmx_exit_handled() will not pass related exits to L1.
1759          * These rules have exceptions below.
1760          */
1761
1762         /* pin-based controls */
1763         /*
1764          * According to the Intel spec, if bit 55 of VMX_BASIC is off (as it is
1765          * in our case), bits 1, 2 and 4 (i.e., 0x16) must be 1 in this MSR.
1766          */
1767         nested_vmx_pinbased_ctls_low = 0x16 ;
1768         nested_vmx_pinbased_ctls_high = 0x16 |
1769                 PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING |
1770                 PIN_BASED_VIRTUAL_NMIS;
1771
1772         /* exit controls */
1773         nested_vmx_exit_ctls_low = 0;
1774 #ifdef CONFIG_X86_64
1775         nested_vmx_exit_ctls_high = VM_EXIT_HOST_ADDR_SPACE_SIZE;
1776 #else
1777         nested_vmx_exit_ctls_high = 0;
1778 #endif
1779
1780         /* entry controls */
1781         rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
1782                 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high);
1783         nested_vmx_entry_ctls_low = 0;
1784         nested_vmx_entry_ctls_high &=
1785                 VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_IA32E_MODE;
1786
1787         /* cpu-based controls */
1788         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
1789                 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high);
1790         nested_vmx_procbased_ctls_low = 0;
1791         nested_vmx_procbased_ctls_high &=
1792                 CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_USE_TSC_OFFSETING |
1793                 CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
1794                 CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
1795                 CPU_BASED_CR3_STORE_EXITING |
1796 #ifdef CONFIG_X86_64
1797                 CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
1798 #endif
1799                 CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
1800                 CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING |
1801                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
1802         /*
1803          * We can allow some features even when not supported by the
1804          * hardware. For example, L1 can specify an MSR bitmap - and we
1805          * can use it to avoid exits to L1 - even when L0 runs L2
1806          * without MSR bitmaps.
1807          */
1808         nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS;
1809
1810         /* secondary cpu-based controls */
1811         rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
1812                 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high);
1813         nested_vmx_secondary_ctls_low = 0;
1814         nested_vmx_secondary_ctls_high &=
1815                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
1816 }
1817
1818 static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
1819 {
1820         /*
1821          * Bits 0 in high must be 0, and bits 1 in low must be 1.
1822          */
1823         return ((control & high) | low) == control;
1824 }
1825
1826 static inline u64 vmx_control_msr(u32 low, u32 high)
1827 {
1828         return low | ((u64)high << 32);
1829 }
1830
1831 /*
1832  * If we allow our guest to use VMX instructions (i.e., nested VMX), we should
1833  * also let it use VMX-specific MSRs.
1834  * vmx_get_vmx_msr() and vmx_set_vmx_msr() return 1 when we handled a
1835  * VMX-specific MSR, or 0 when we haven't (and the caller should handle it
1836  * like all other MSRs).
1837  */
1838 static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1839 {
1840         if (!nested_vmx_allowed(vcpu) && msr_index >= MSR_IA32_VMX_BASIC &&
1841                      msr_index <= MSR_IA32_VMX_TRUE_ENTRY_CTLS) {
1842                 /*
1843                  * According to the spec, processors which do not support VMX
1844                  * should throw a #GP(0) when VMX capability MSRs are read.
1845                  */
1846                 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
1847                 return 1;
1848         }
1849
1850         switch (msr_index) {
1851         case MSR_IA32_FEATURE_CONTROL:
1852                 *pdata = 0;
1853                 break;
1854         case MSR_IA32_VMX_BASIC:
1855                 /*
1856                  * This MSR reports some information about VMX support. We
1857                  * should return information about the VMX we emulate for the
1858                  * guest, and the VMCS structure we give it - not about the
1859                  * VMX support of the underlying hardware.
1860                  */
1861                 *pdata = VMCS12_REVISION |
1862                            ((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
1863                            (VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
1864                 break;
1865         case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
1866         case MSR_IA32_VMX_PINBASED_CTLS:
1867                 *pdata = vmx_control_msr(nested_vmx_pinbased_ctls_low,
1868                                         nested_vmx_pinbased_ctls_high);
1869                 break;
1870         case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
1871         case MSR_IA32_VMX_PROCBASED_CTLS:
1872                 *pdata = vmx_control_msr(nested_vmx_procbased_ctls_low,
1873                                         nested_vmx_procbased_ctls_high);
1874                 break;
1875         case MSR_IA32_VMX_TRUE_EXIT_CTLS:
1876         case MSR_IA32_VMX_EXIT_CTLS:
1877                 *pdata = vmx_control_msr(nested_vmx_exit_ctls_low,
1878                                         nested_vmx_exit_ctls_high);
1879                 break;
1880         case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
1881         case MSR_IA32_VMX_ENTRY_CTLS:
1882                 *pdata = vmx_control_msr(nested_vmx_entry_ctls_low,
1883                                         nested_vmx_entry_ctls_high);
1884                 break;
1885         case MSR_IA32_VMX_MISC:
1886                 *pdata = 0;
1887                 break;
1888         /*
1889          * These MSRs specify bits which the guest must keep fixed (on or off)
1890          * while L1 is in VMXON mode (in L1's root mode, or running an L2).
1891          * We picked the standard core2 setting.
1892          */
1893 #define VMXON_CR0_ALWAYSON      (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
1894 #define VMXON_CR4_ALWAYSON      X86_CR4_VMXE
1895         case MSR_IA32_VMX_CR0_FIXED0:
1896                 *pdata = VMXON_CR0_ALWAYSON;
1897                 break;
1898         case MSR_IA32_VMX_CR0_FIXED1:
1899                 *pdata = -1ULL;
1900                 break;
1901         case MSR_IA32_VMX_CR4_FIXED0:
1902                 *pdata = VMXON_CR4_ALWAYSON;
1903                 break;
1904         case MSR_IA32_VMX_CR4_FIXED1:
1905                 *pdata = -1ULL;
1906                 break;
1907         case MSR_IA32_VMX_VMCS_ENUM:
1908                 *pdata = 0x1f;
1909                 break;
1910         case MSR_IA32_VMX_PROCBASED_CTLS2:
1911                 *pdata = vmx_control_msr(nested_vmx_secondary_ctls_low,
1912                                         nested_vmx_secondary_ctls_high);
1913                 break;
1914         case MSR_IA32_VMX_EPT_VPID_CAP:
1915                 /* Currently, no nested ept or nested vpid */
1916                 *pdata = 0;
1917                 break;
1918         default:
1919                 return 0;
1920         }
1921
1922         return 1;
1923 }
1924
1925 static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1926 {
1927         if (!nested_vmx_allowed(vcpu))
1928                 return 0;
1929
1930         if (msr_index == MSR_IA32_FEATURE_CONTROL)
1931                 /* TODO: the right thing. */
1932                 return 1;
1933         /*
1934          * No need to treat VMX capability MSRs specially: If we don't handle
1935          * them, handle_wrmsr will #GP(0), which is correct (they are readonly)
1936          */
1937         return 0;
1938 }
1939
1940 /*
1941  * Reads an msr value (of 'msr_index') into 'pdata'.
1942  * Returns 0 on success, non-0 otherwise.
1943  * Assumes vcpu_load() was already called.
1944  */
1945 static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1946 {
1947         u64 data;
1948         struct shared_msr_entry *msr;
1949
1950         if (!pdata) {
1951                 printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
1952                 return -EINVAL;
1953         }
1954
1955         switch (msr_index) {
1956 #ifdef CONFIG_X86_64
1957         case MSR_FS_BASE:
1958                 data = vmcs_readl(GUEST_FS_BASE);
1959                 break;
1960         case MSR_GS_BASE:
1961                 data = vmcs_readl(GUEST_GS_BASE);
1962                 break;
1963         case MSR_KERNEL_GS_BASE:
1964                 vmx_load_host_state(to_vmx(vcpu));
1965                 data = to_vmx(vcpu)->msr_guest_kernel_gs_base;
1966                 break;
1967 #endif
1968         case MSR_EFER:
1969                 return kvm_get_msr_common(vcpu, msr_index, pdata);
1970         case MSR_IA32_TSC:
1971                 data = guest_read_tsc();
1972                 break;
1973         case MSR_IA32_SYSENTER_CS:
1974                 data = vmcs_read32(GUEST_SYSENTER_CS);
1975                 break;
1976         case MSR_IA32_SYSENTER_EIP:
1977                 data = vmcs_readl(GUEST_SYSENTER_EIP);
1978                 break;
1979         case MSR_IA32_SYSENTER_ESP:
1980                 data = vmcs_readl(GUEST_SYSENTER_ESP);
1981                 break;
1982         case MSR_TSC_AUX:
1983                 if (!to_vmx(vcpu)->rdtscp_enabled)
1984                         return 1;
1985                 /* Otherwise falls through */
1986         default:
1987                 vmx_load_host_state(to_vmx(vcpu));
1988                 if (vmx_get_vmx_msr(vcpu, msr_index, pdata))
1989                         return 0;
1990                 msr = find_msr_entry(to_vmx(vcpu), msr_index);
1991                 if (msr) {
1992                         vmx_load_host_state(to_vmx(vcpu));
1993                         data = msr->data;
1994                         break;
1995                 }
1996                 return kvm_get_msr_common(vcpu, msr_index, pdata);
1997         }
1998
1999         *pdata = data;
2000         return 0;
2001 }
2002
2003 /*
2004  * Writes msr value into into the appropriate "register".
2005  * Returns 0 on success, non-0 otherwise.
2006  * Assumes vcpu_load() was already called.
2007  */
2008 static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
2009 {
2010         struct vcpu_vmx *vmx = to_vmx(vcpu);
2011         struct shared_msr_entry *msr;
2012         int ret = 0;
2013
2014         switch (msr_index) {
2015         case MSR_EFER:
2016                 vmx_load_host_state(vmx);
2017                 ret = kvm_set_msr_common(vcpu, msr_index, data);
2018                 break;
2019 #ifdef CONFIG_X86_64
2020         case MSR_FS_BASE:
2021                 vmx_segment_cache_clear(vmx);
2022                 vmcs_writel(GUEST_FS_BASE, data);
2023                 break;
2024         case MSR_GS_BASE:
2025                 vmx_segment_cache_clear(vmx);
2026                 vmcs_writel(GUEST_GS_BASE, data);
2027                 break;
2028         case MSR_KERNEL_GS_BASE:
2029                 vmx_load_host_state(vmx);
2030                 vmx->msr_guest_kernel_gs_base = data;
2031                 break;
2032 #endif
2033         case MSR_IA32_SYSENTER_CS:
2034                 vmcs_write32(GUEST_SYSENTER_CS, data);
2035                 break;
2036         case MSR_IA32_SYSENTER_EIP:
2037                 vmcs_writel(GUEST_SYSENTER_EIP, data);
2038                 break;
2039         case MSR_IA32_SYSENTER_ESP:
2040                 vmcs_writel(GUEST_SYSENTER_ESP, data);
2041                 break;
2042         case MSR_IA32_TSC:
2043                 kvm_write_tsc(vcpu, data);
2044                 break;
2045         case MSR_IA32_CR_PAT:
2046                 if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
2047                         vmcs_write64(GUEST_IA32_PAT, data);
2048                         vcpu->arch.pat = data;
2049                         break;
2050                 }
2051                 ret = kvm_set_msr_common(vcpu, msr_index, data);
2052                 break;
2053         case MSR_TSC_AUX:
2054                 if (!vmx->rdtscp_enabled)
2055                         return 1;
2056                 /* Check reserved bit, higher 32 bits should be zero */
2057                 if ((data >> 32) != 0)
2058                         return 1;
2059                 /* Otherwise falls through */
2060         default:
2061                 if (vmx_set_vmx_msr(vcpu, msr_index, data))
2062                         break;
2063                 msr = find_msr_entry(vmx, msr_index);
2064                 if (msr) {
2065                         vmx_load_host_state(vmx);
2066                         msr->data = data;
2067                         break;
2068                 }
2069                 ret = kvm_set_msr_common(vcpu, msr_index, data);
2070         }
2071
2072         return ret;
2073 }
2074
2075 static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
2076 {
2077         __set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
2078         switch (reg) {
2079         case VCPU_REGS_RSP:
2080                 vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
2081                 break;
2082         case VCPU_REGS_RIP:
2083                 vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
2084                 break;
2085         case VCPU_EXREG_PDPTR:
2086                 if (enable_ept)
2087                         ept_save_pdptrs(vcpu);
2088                 break;
2089         default:
2090                 break;
2091         }
2092 }
2093
2094 static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
2095 {
2096         if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
2097                 vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
2098         else
2099                 vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
2100
2101         update_exception_bitmap(vcpu);
2102 }
2103
2104 static __init int cpu_has_kvm_support(void)
2105 {
2106         return cpu_has_vmx();
2107 }
2108
2109 static __init int vmx_disabled_by_bios(void)
2110 {
2111         u64 msr;
2112
2113         rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
2114         if (msr & FEATURE_CONTROL_LOCKED) {
2115                 /* launched w/ TXT and VMX disabled */
2116                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
2117                         && tboot_enabled())
2118                         return 1;
2119                 /* launched w/o TXT and VMX only enabled w/ TXT */
2120                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
2121                         && (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
2122                         && !tboot_enabled()) {
2123                         printk(KERN_WARNING "kvm: disable TXT in the BIOS or "
2124                                 "activate TXT before enabling KVM\n");
2125                         return 1;
2126                 }
2127                 /* launched w/o TXT and VMX disabled */
2128                 if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
2129                         && !tboot_enabled())
2130                         return 1;
2131         }
2132
2133         return 0;
2134 }
2135
2136 static void kvm_cpu_vmxon(u64 addr)
2137 {
2138         asm volatile (ASM_VMX_VMXON_RAX
2139                         : : "a"(&addr), "m"(addr)
2140                         : "memory", "cc");
2141 }
2142
2143 static int hardware_enable(void *garbage)
2144 {
2145         int cpu = raw_smp_processor_id();
2146         u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
2147         u64 old, test_bits;
2148
2149         if (read_cr4() & X86_CR4_VMXE)
2150                 return -EBUSY;
2151
2152         INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
2153         rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
2154
2155         test_bits = FEATURE_CONTROL_LOCKED;
2156         test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
2157         if (tboot_enabled())
2158                 test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX;
2159
2160         if ((old & test_bits) != test_bits) {
2161                 /* enable and lock */
2162                 wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits);
2163         }
2164         write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
2165
2166         if (vmm_exclusive) {
2167                 kvm_cpu_vmxon(phys_addr);
2168                 ept_sync_global();
2169         }
2170
2171         store_gdt(&__get_cpu_var(host_gdt));
2172
2173         return 0;
2174 }
2175
2176 static void vmclear_local_loaded_vmcss(void)
2177 {
2178         int cpu = raw_smp_processor_id();
2179         struct loaded_vmcs *v, *n;
2180
2181         list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu),
2182                                  loaded_vmcss_on_cpu_link)
2183                 __loaded_vmcs_clear(v);
2184 }
2185
2186
2187 /* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
2188  * tricks.
2189  */
2190 static void kvm_cpu_vmxoff(void)
2191 {
2192         asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
2193 }
2194
2195 static void hardware_disable(void *garbage)
2196 {
2197         if (vmm_exclusive) {
2198                 vmclear_local_loaded_vmcss();
2199                 kvm_cpu_vmxoff();
2200         }
2201         write_cr4(read_cr4() & ~X86_CR4_VMXE);
2202 }
2203
2204 static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
2205                                       u32 msr, u32 *result)
2206 {
2207         u32 vmx_msr_low, vmx_msr_high;
2208         u32 ctl = ctl_min | ctl_opt;
2209
2210         rdmsr(msr, vmx_msr_low, vmx_msr_high);
2211
2212         ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
2213         ctl |= vmx_msr_low;  /* bit == 1 in low word  ==> must be one  */
2214
2215         /* Ensure minimum (required) set of control bits are supported. */
2216         if (ctl_min & ~ctl)
2217                 return -EIO;
2218
2219         *result = ctl;
2220         return 0;
2221 }
2222
2223 static __init bool allow_1_setting(u32 msr, u32 ctl)
2224 {
2225         u32 vmx_msr_low, vmx_msr_high;
2226
2227         rdmsr(msr, vmx_msr_low, vmx_msr_high);
2228         return vmx_msr_high & ctl;
2229 }
2230
2231 static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
2232 {
2233         u32 vmx_msr_low, vmx_msr_high;
2234         u32 min, opt, min2, opt2;
2235         u32 _pin_based_exec_control = 0;
2236         u32 _cpu_based_exec_control = 0;
2237         u32 _cpu_based_2nd_exec_control = 0;
2238         u32 _vmexit_control = 0;
2239         u32 _vmentry_control = 0;
2240
2241         min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
2242         opt = PIN_BASED_VIRTUAL_NMIS;
2243         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
2244                                 &_pin_based_exec_control) < 0)
2245                 return -EIO;
2246
2247         min =
2248 #ifdef CONFIG_X86_64
2249               CPU_BASED_CR8_LOAD_EXITING |
2250               CPU_BASED_CR8_STORE_EXITING |
2251 #endif
2252               CPU_BASED_CR3_LOAD_EXITING |
2253               CPU_BASED_CR3_STORE_EXITING |
2254               CPU_BASED_USE_IO_BITMAPS |
2255               CPU_BASED_MOV_DR_EXITING |
2256               CPU_BASED_USE_TSC_OFFSETING |
2257               CPU_BASED_MWAIT_EXITING |
2258               CPU_BASED_MONITOR_EXITING |
2259               CPU_BASED_INVLPG_EXITING;
2260
2261         if (yield_on_hlt)
2262                 min |= CPU_BASED_HLT_EXITING;
2263
2264         opt = CPU_BASED_TPR_SHADOW |
2265               CPU_BASED_USE_MSR_BITMAPS |
2266               CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
2267         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
2268                                 &_cpu_based_exec_control) < 0)
2269                 return -EIO;
2270 #ifdef CONFIG_X86_64
2271         if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
2272                 _cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
2273                                            ~CPU_BASED_CR8_STORE_EXITING;
2274 #endif
2275         if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
2276                 min2 = 0;
2277                 opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
2278                         SECONDARY_EXEC_WBINVD_EXITING |
2279                         SECONDARY_EXEC_ENABLE_VPID |
2280                         SECONDARY_EXEC_ENABLE_EPT |
2281                         SECONDARY_EXEC_UNRESTRICTED_GUEST |
2282                         SECONDARY_EXEC_PAUSE_LOOP_EXITING |
2283                         SECONDARY_EXEC_RDTSCP;
2284                 if (adjust_vmx_controls(min2, opt2,
2285                                         MSR_IA32_VMX_PROCBASED_CTLS2,
2286                                         &_cpu_based_2nd_exec_control) < 0)
2287                         return -EIO;
2288         }
2289 #ifndef CONFIG_X86_64
2290         if (!(_cpu_based_2nd_exec_control &
2291                                 SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
2292                 _cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
2293 #endif
2294         if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
2295                 /* CR3 accesses and invlpg don't need to cause VM Exits when EPT
2296                    enabled */
2297                 _cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
2298                                              CPU_BASED_CR3_STORE_EXITING |
2299                                              CPU_BASED_INVLPG_EXITING);
2300                 rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
2301                       vmx_capability.ept, vmx_capability.vpid);
2302         }
2303
2304         min = 0;
2305 #ifdef CONFIG_X86_64
2306         min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
2307 #endif
2308         opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
2309         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
2310                                 &_vmexit_control) < 0)
2311                 return -EIO;
2312
2313         min = 0;
2314         opt = VM_ENTRY_LOAD_IA32_PAT;
2315         if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
2316                                 &_vmentry_control) < 0)
2317                 return -EIO;
2318
2319         rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
2320
2321         /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
2322         if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
2323                 return -EIO;
2324
2325 #ifdef CONFIG_X86_64
2326         /* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
2327         if (vmx_msr_high & (1u<<16))
2328                 return -EIO;
2329 #endif
2330
2331         /* Require Write-Back (WB) memory type for VMCS accesses. */
2332         if (((vmx_msr_high >> 18) & 15) != 6)
2333                 return -EIO;
2334
2335         vmcs_conf->size = vmx_msr_high & 0x1fff;
2336         vmcs_conf->order = get_order(vmcs_config.size);
2337         vmcs_conf->revision_id = vmx_msr_low;
2338
2339         vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
2340         vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
2341         vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
2342         vmcs_conf->vmexit_ctrl         = _vmexit_control;
2343         vmcs_conf->vmentry_ctrl        = _vmentry_control;
2344
2345         cpu_has_load_ia32_efer =
2346                 allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
2347                                 VM_ENTRY_LOAD_IA32_EFER)
2348                 && allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
2349                                    VM_EXIT_LOAD_IA32_EFER);
2350
2351         return 0;
2352 }
2353
2354 static struct vmcs *alloc_vmcs_cpu(int cpu)
2355 {
2356         int node = cpu_to_node(cpu);
2357         struct page *pages;
2358         struct vmcs *vmcs;
2359
2360         pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
2361         if (!pages)
2362                 return NULL;
2363         vmcs = page_address(pages);
2364         memset(vmcs, 0, vmcs_config.size);
2365         vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
2366         return vmcs;
2367 }
2368
2369 static struct vmcs *alloc_vmcs(void)
2370 {
2371         return alloc_vmcs_cpu(raw_smp_processor_id());
2372 }
2373
2374 static void free_vmcs(struct vmcs *vmcs)
2375 {
2376         free_pages((unsigned long)vmcs, vmcs_config.order);
2377 }
2378
2379 /*
2380  * Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded
2381  */
2382 static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
2383 {
2384         if (!loaded_vmcs->vmcs)
2385                 return;
2386         loaded_vmcs_clear(loaded_vmcs);
2387         free_vmcs(loaded_vmcs->vmcs);
2388         loaded_vmcs->vmcs = NULL;
2389 }
2390
2391 static void free_kvm_area(void)
2392 {
2393         int cpu;
2394
2395         for_each_possible_cpu(cpu) {
2396                 free_vmcs(per_cpu(vmxarea, cpu));
2397                 per_cpu(vmxarea, cpu) = NULL;
2398         }
2399 }
2400
2401 static __init int alloc_kvm_area(void)
2402 {
2403         int cpu;
2404
2405         for_each_possible_cpu(cpu) {
2406                 struct vmcs *vmcs;
2407
2408                 vmcs = alloc_vmcs_cpu(cpu);
2409                 if (!vmcs) {
2410                         free_kvm_area();
2411                         return -ENOMEM;
2412                 }
2413
2414                 per_cpu(vmxarea, cpu) = vmcs;
2415         }
2416         return 0;
2417 }
2418
2419 static __init int hardware_setup(void)
2420 {
2421         if (setup_vmcs_config(&vmcs_config) < 0)
2422                 return -EIO;
2423
2424         if (boot_cpu_has(X86_FEATURE_NX))
2425                 kvm_enable_efer_bits(EFER_NX);
2426
2427         if (!cpu_has_vmx_vpid())
2428                 enable_vpid = 0;
2429
2430         if (!cpu_has_vmx_ept() ||
2431             !cpu_has_vmx_ept_4levels()) {
2432                 enable_ept = 0;
2433                 enable_unrestricted_guest = 0;
2434         }
2435
2436         if (!cpu_has_vmx_unrestricted_guest())
2437                 enable_unrestricted_guest = 0;
2438
2439         if (!cpu_has_vmx_flexpriority())
2440                 flexpriority_enabled = 0;
2441
2442         if (!cpu_has_vmx_tpr_shadow())
2443                 kvm_x86_ops->update_cr8_intercept = NULL;
2444
2445         if (enable_ept && !cpu_has_vmx_ept_2m_page())
2446                 kvm_disable_largepages();
2447
2448         if (!cpu_has_vmx_ple())
2449                 ple_gap = 0;
2450
2451         if (nested)
2452                 nested_vmx_setup_ctls_msrs();
2453
2454         return alloc_kvm_area();
2455 }
2456
2457 static __exit void hardware_unsetup(void)
2458 {
2459         free_kvm_area();
2460 }
2461
2462 static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
2463 {
2464         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2465
2466         if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
2467                 vmcs_write16(sf->selector, save->selector);
2468                 vmcs_writel(sf->base, save->base);
2469                 vmcs_write32(sf->limit, save->limit);
2470                 vmcs_write32(sf->ar_bytes, save->ar);
2471         } else {
2472                 u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
2473                         << AR_DPL_SHIFT;
2474                 vmcs_write32(sf->ar_bytes, 0x93 | dpl);
2475         }
2476 }
2477
2478 static void enter_pmode(struct kvm_vcpu *vcpu)
2479 {
2480         unsigned long flags;
2481         struct vcpu_vmx *vmx = to_vmx(vcpu);
2482
2483         vmx->emulation_required = 1;
2484         vmx->rmode.vm86_active = 0;
2485
2486         vmx_segment_cache_clear(vmx);
2487
2488         vmcs_write16(GUEST_TR_SELECTOR, vmx->rmode.tr.selector);
2489         vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base);
2490         vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit);
2491         vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar);
2492
2493         flags = vmcs_readl(GUEST_RFLAGS);
2494         flags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
2495         flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
2496         vmcs_writel(GUEST_RFLAGS, flags);
2497
2498         vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
2499                         (vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
2500
2501         update_exception_bitmap(vcpu);
2502
2503         if (emulate_invalid_guest_state)
2504                 return;
2505
2506         fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es);
2507         fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds);
2508         fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs);
2509         fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs);
2510
2511         vmx_segment_cache_clear(vmx);
2512
2513         vmcs_write16(GUEST_SS_SELECTOR, 0);
2514         vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
2515
2516         vmcs_write16(GUEST_CS_SELECTOR,
2517                      vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
2518         vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
2519 }
2520
2521 static gva_t rmode_tss_base(struct kvm *kvm)
2522 {
2523         if (!kvm->arch.tss_addr) {
2524                 struct kvm_memslots *slots;
2525                 gfn_t base_gfn;
2526
2527                 slots = kvm_memslots(kvm);
2528                 base_gfn = slots->memslots[0].base_gfn +
2529                                  kvm->memslots->memslots[0].npages - 3;
2530                 return base_gfn << PAGE_SHIFT;
2531         }
2532         return kvm->arch.tss_addr;
2533 }
2534
2535 static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
2536 {
2537         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2538
2539         save->selector = vmcs_read16(sf->selector);
2540         save->base = vmcs_readl(sf->base);
2541         save->limit = vmcs_read32(sf->limit);
2542         save->ar = vmcs_read32(sf->ar_bytes);
2543         vmcs_write16(sf->selector, save->base >> 4);
2544         vmcs_write32(sf->base, save->base & 0xffff0);
2545         vmcs_write32(sf->limit, 0xffff);
2546         vmcs_write32(sf->ar_bytes, 0xf3);
2547         if (save->base & 0xf)
2548                 printk_once(KERN_WARNING "kvm: segment base is not paragraph"
2549                             " aligned when entering protected mode (seg=%d)",
2550                             seg);
2551 }
2552
2553 static void enter_rmode(struct kvm_vcpu *vcpu)
2554 {
2555         unsigned long flags;
2556         struct vcpu_vmx *vmx = to_vmx(vcpu);
2557
2558         if (enable_unrestricted_guest)
2559                 return;
2560
2561         vmx->emulation_required = 1;
2562         vmx->rmode.vm86_active = 1;
2563
2564         /*
2565          * Very old userspace does not call KVM_SET_TSS_ADDR before entering
2566          * vcpu. Call it here with phys address pointing 16M below 4G.
2567          */
2568         if (!vcpu->kvm->arch.tss_addr) {
2569                 printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be "
2570                              "called before entering vcpu\n");
2571                 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
2572                 vmx_set_tss_addr(vcpu->kvm, 0xfeffd000);
2573                 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
2574         }
2575
2576         vmx_segment_cache_clear(vmx);
2577
2578         vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR);
2579         vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
2580         vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
2581
2582         vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
2583         vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
2584
2585         vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
2586         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
2587
2588         flags = vmcs_readl(GUEST_RFLAGS);
2589         vmx->rmode.save_rflags = flags;
2590
2591         flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
2592
2593         vmcs_writel(GUEST_RFLAGS, flags);
2594         vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
2595         update_exception_bitmap(vcpu);
2596
2597         if (emulate_invalid_guest_state)
2598                 goto continue_rmode;
2599
2600         vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
2601         vmcs_write32(GUEST_SS_LIMIT, 0xffff);
2602         vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
2603
2604         vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
2605         vmcs_write32(GUEST_CS_LIMIT, 0xffff);
2606         if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
2607                 vmcs_writel(GUEST_CS_BASE, 0xf0000);
2608         vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
2609
2610         fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
2611         fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
2612         fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
2613         fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
2614
2615 continue_rmode:
2616         kvm_mmu_reset_context(vcpu);
2617 }
2618
2619 static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
2620 {
2621         struct vcpu_vmx *vmx = to_vmx(vcpu);
2622         struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
2623
2624         if (!msr)
2625                 return;
2626
2627         /*
2628          * Force kernel_gs_base reloading before EFER changes, as control
2629          * of this msr depends on is_long_mode().
2630          */
2631         vmx_load_host_state(to_vmx(vcpu));
2632         vcpu->arch.efer = efer;
2633         if (efer & EFER_LMA) {
2634                 vmcs_write32(VM_ENTRY_CONTROLS,
2635                              vmcs_read32(VM_ENTRY_CONTROLS) |
2636                              VM_ENTRY_IA32E_MODE);
2637                 msr->data = efer;
2638         } else {
2639                 vmcs_write32(VM_ENTRY_CONTROLS,
2640                              vmcs_read32(VM_ENTRY_CONTROLS) &
2641                              ~VM_ENTRY_IA32E_MODE);
2642
2643                 msr->data = efer & ~EFER_LME;
2644         }
2645         setup_msrs(vmx);
2646 }
2647
2648 #ifdef CONFIG_X86_64
2649
2650 static void enter_lmode(struct kvm_vcpu *vcpu)
2651 {
2652         u32 guest_tr_ar;
2653
2654         vmx_segment_cache_clear(to_vmx(vcpu));
2655
2656         guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
2657         if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
2658                 printk(KERN_DEBUG "%s: tss fixup for long mode. \n",
2659                        __func__);
2660                 vmcs_write32(GUEST_TR_AR_BYTES,
2661                              (guest_tr_ar & ~AR_TYPE_MASK)
2662                              | AR_TYPE_BUSY_64_TSS);
2663         }
2664         vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
2665 }
2666
2667 static void exit_lmode(struct kvm_vcpu *vcpu)
2668 {
2669         vmcs_write32(VM_ENTRY_CONTROLS,
2670                      vmcs_read32(VM_ENTRY_CONTROLS)
2671                      & ~VM_ENTRY_IA32E_MODE);
2672         vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
2673 }
2674
2675 #endif
2676
2677 static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
2678 {
2679         vpid_sync_context(to_vmx(vcpu));
2680         if (enable_ept) {
2681                 if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
2682                         return;
2683                 ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
2684         }
2685 }
2686
2687 static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
2688 {
2689         ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits;
2690
2691         vcpu->arch.cr0 &= ~cr0_guest_owned_bits;
2692         vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits;
2693 }
2694
2695 static void vmx_decache_cr3(struct kvm_vcpu *vcpu)
2696 {
2697         if (enable_ept && is_paging(vcpu))
2698                 vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
2699         __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
2700 }
2701
2702 static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
2703 {
2704         ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;
2705
2706         vcpu->arch.cr4 &= ~cr4_guest_owned_bits;
2707         vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits;
2708 }
2709
2710 static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
2711 {
2712         if (!test_bit(VCPU_EXREG_PDPTR,
2713                       (unsigned long *)&vcpu->arch.regs_dirty))
2714                 return;
2715
2716         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
2717                 vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]);
2718                 vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]);
2719                 vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]);
2720                 vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]);
2721         }
2722 }
2723
2724 static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
2725 {
2726         if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
2727                 vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
2728                 vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
2729                 vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
2730                 vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
2731         }
2732
2733         __set_bit(VCPU_EXREG_PDPTR,
2734                   (unsigned long *)&vcpu->arch.regs_avail);
2735         __set_bit(VCPU_EXREG_PDPTR,
2736                   (unsigned long *)&vcpu->arch.regs_dirty);
2737 }
2738
2739 static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
2740
2741 static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
2742                                         unsigned long cr0,
2743                                         struct kvm_vcpu *vcpu)
2744 {
2745         if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
2746                 vmx_decache_cr3(vcpu);
2747         if (!(cr0 & X86_CR0_PG)) {
2748                 /* From paging/starting to nonpaging */
2749                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
2750                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
2751                              (CPU_BASED_CR3_LOAD_EXITING |
2752                               CPU_BASED_CR3_STORE_EXITING));
2753                 vcpu->arch.cr0 = cr0;
2754                 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
2755         } else if (!is_paging(vcpu)) {
2756                 /* From nonpaging to paging */
2757                 vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
2758                              vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
2759                              ~(CPU_BASED_CR3_LOAD_EXITING |
2760                                CPU_BASED_CR3_STORE_EXITING));
2761                 vcpu->arch.cr0 = cr0;
2762                 vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
2763         }
2764
2765         if (!(cr0 & X86_CR0_WP))
2766                 *hw_cr0 &= ~X86_CR0_WP;
2767 }
2768
2769 static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
2770 {
2771         struct vcpu_vmx *vmx = to_vmx(vcpu);
2772         unsigned long hw_cr0;
2773
2774         if (enable_unrestricted_guest)
2775                 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
2776                         | KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
2777         else
2778                 hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
2779
2780         if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
2781                 enter_pmode(vcpu);
2782
2783         if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
2784                 enter_rmode(vcpu);
2785
2786 #ifdef CONFIG_X86_64
2787         if (vcpu->arch.efer & EFER_LME) {
2788                 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
2789                         enter_lmode(vcpu);
2790                 if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
2791                         exit_lmode(vcpu);
2792         }
2793 #endif
2794
2795         if (enable_ept)
2796                 ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
2797
2798         if (!vcpu->fpu_active)
2799                 hw_cr0 |= X86_CR0_TS | X86_CR0_MP;
2800
2801         vmcs_writel(CR0_READ_SHADOW, cr0);
2802         vmcs_writel(GUEST_CR0, hw_cr0);
2803         vcpu->arch.cr0 = cr0;
2804         __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
2805 }
2806
2807 static u64 construct_eptp(unsigned long root_hpa)
2808 {
2809         u64 eptp;
2810
2811         /* TODO write the value reading from MSR */
2812         eptp = VMX_EPT_DEFAULT_MT |
2813                 VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
2814         eptp |= (root_hpa & PAGE_MASK);
2815
2816         return eptp;
2817 }
2818
2819 static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
2820 {
2821         unsigned long guest_cr3;
2822         u64 eptp;
2823
2824         guest_cr3 = cr3;
2825         if (enable_ept) {
2826                 eptp = construct_eptp(cr3);
2827                 vmcs_write64(EPT_POINTER, eptp);
2828                 guest_cr3 = is_paging(vcpu) ? kvm_read_cr3(vcpu) :
2829                         vcpu->kvm->arch.ept_identity_map_addr;
2830                 ept_load_pdptrs(vcpu);
2831         }
2832
2833         vmx_flush_tlb(vcpu);
2834         vmcs_writel(GUEST_CR3, guest_cr3);
2835 }
2836
2837 static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
2838 {
2839         unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
2840                     KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
2841
2842         if (cr4 & X86_CR4_VMXE) {
2843                 /*
2844                  * To use VMXON (and later other VMX instructions), a guest
2845                  * must first be able to turn on cr4.VMXE (see handle_vmon()).
2846                  * So basically the check on whether to allow nested VMX
2847                  * is here.
2848                  */
2849                 if (!nested_vmx_allowed(vcpu))
2850                         return 1;
2851         } else if (to_vmx(vcpu)->nested.vmxon)
2852                 return 1;
2853
2854         vcpu->arch.cr4 = cr4;
2855         if (enable_ept) {
2856                 if (!is_paging(vcpu)) {
2857                         hw_cr4 &= ~X86_CR4_PAE;
2858                         hw_cr4 |= X86_CR4_PSE;
2859                 } else if (!(cr4 & X86_CR4_PAE)) {
2860                         hw_cr4 &= ~X86_CR4_PAE;
2861                 }
2862         }
2863
2864         vmcs_writel(CR4_READ_SHADOW, cr4);
2865         vmcs_writel(GUEST_CR4, hw_cr4);
2866         return 0;
2867 }
2868
2869 static void vmx_get_segment(struct kvm_vcpu *vcpu,
2870                             struct kvm_segment *var, int seg)
2871 {
2872         struct vcpu_vmx *vmx = to_vmx(vcpu);
2873         struct kvm_save_segment *save;
2874         u32 ar;
2875
2876         if (vmx->rmode.vm86_active
2877             && (seg == VCPU_SREG_TR || seg == VCPU_SREG_ES
2878                 || seg == VCPU_SREG_DS || seg == VCPU_SREG_FS
2879                 || seg == VCPU_SREG_GS)
2880             && !emulate_invalid_guest_state) {
2881                 switch (seg) {
2882                 case VCPU_SREG_TR: save = &vmx->rmode.tr; break;
2883                 case VCPU_SREG_ES: save = &vmx->rmode.es; break;
2884                 case VCPU_SREG_DS: save = &vmx->rmode.ds; break;
2885                 case VCPU_SREG_FS: save = &vmx->rmode.fs; break;
2886                 case VCPU_SREG_GS: save = &vmx->rmode.gs; break;
2887                 default: BUG();
2888                 }
2889                 var->selector = save->selector;
2890                 var->base = save->base;
2891                 var->limit = save->limit;
2892                 ar = save->ar;
2893                 if (seg == VCPU_SREG_TR
2894                     || var->selector == vmx_read_guest_seg_selector(vmx, seg))
2895                         goto use_saved_rmode_seg;
2896         }
2897         var->base = vmx_read_guest_seg_base(vmx, seg);
2898         var->limit = vmx_read_guest_seg_limit(vmx, seg);
2899         var->selector = vmx_read_guest_seg_selector(vmx, seg);
2900         ar = vmx_read_guest_seg_ar(vmx, seg);
2901 use_saved_rmode_seg:
2902         if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
2903                 ar = 0;
2904         var->type = ar & 15;
2905         var->s = (ar >> 4) & 1;
2906         var->dpl = (ar >> 5) & 3;
2907         var->present = (ar >> 7) & 1;
2908         var->avl = (ar >> 12) & 1;
2909         var->l = (ar >> 13) & 1;
2910         var->db = (ar >> 14) & 1;
2911         var->g = (ar >> 15) & 1;
2912         var->unusable = (ar >> 16) & 1;
2913 }
2914
2915 static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
2916 {
2917         struct kvm_segment s;
2918
2919         if (to_vmx(vcpu)->rmode.vm86_active) {
2920                 vmx_get_segment(vcpu, &s, seg);
2921                 return s.base;
2922         }
2923         return vmx_read_guest_seg_base(to_vmx(vcpu), seg);
2924 }
2925
2926 static int __vmx_get_cpl(struct kvm_vcpu *vcpu)
2927 {
2928         if (!is_protmode(vcpu))
2929                 return 0;
2930
2931         if (!is_long_mode(vcpu)
2932             && (kvm_get_rflags(vcpu) & X86_EFLAGS_VM)) /* if virtual 8086 */
2933                 return 3;
2934
2935         return vmx_read_guest_seg_selector(to_vmx(vcpu), VCPU_SREG_CS) & 3;
2936 }
2937
2938 static int vmx_get_cpl(struct kvm_vcpu *vcpu)
2939 {
2940         if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) {
2941                 __set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
2942                 to_vmx(vcpu)->cpl = __vmx_get_cpl(vcpu);
2943         }
2944         return to_vmx(vcpu)->cpl;
2945 }
2946
2947
2948 static u32 vmx_segment_access_rights(struct kvm_segment *var)
2949 {
2950         u32 ar;
2951
2952         if (var->unusable)
2953                 ar = 1 << 16;
2954         else {
2955                 ar = var->type & 15;
2956                 ar |= (var->s & 1) << 4;
2957                 ar |= (var->dpl & 3) << 5;
2958                 ar |= (var->present & 1) << 7;
2959                 ar |= (var->avl & 1) << 12;
2960                 ar |= (var->l & 1) << 13;
2961                 ar |= (var->db & 1) << 14;
2962                 ar |= (var->g & 1) << 15;
2963         }
2964         if (ar == 0) /* a 0 value means unusable */
2965                 ar = AR_UNUSABLE_MASK;
2966
2967         return ar;
2968 }
2969
2970 static void vmx_set_segment(struct kvm_vcpu *vcpu,
2971                             struct kvm_segment *var, int seg)
2972 {
2973         struct vcpu_vmx *vmx = to_vmx(vcpu);
2974         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
2975         u32 ar;
2976
2977         vmx_segment_cache_clear(vmx);
2978
2979         if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
2980                 vmcs_write16(sf->selector, var->selector);
2981                 vmx->rmode.tr.selector = var->selector;
2982                 vmx->rmode.tr.base = var->base;
2983                 vmx->rmode.tr.limit = var->limit;
2984                 vmx->rmode.tr.ar = vmx_segment_access_rights(var);
2985                 return;
2986         }
2987         vmcs_writel(sf->base, var->base);
2988         vmcs_write32(sf->limit, var->limit);
2989         vmcs_write16(sf->selector, var->selector);
2990         if (vmx->rmode.vm86_active && var->s) {
2991                 /*
2992                  * Hack real-mode segments into vm86 compatibility.
2993                  */
2994                 if (var->base == 0xffff0000 && var->selector == 0xf000)
2995                         vmcs_writel(sf->base, 0xf0000);
2996                 ar = 0xf3;
2997         } else
2998                 ar = vmx_segment_access_rights(var);
2999
3000         /*
3001          *   Fix the "Accessed" bit in AR field of segment registers for older
3002          * qemu binaries.
3003          *   IA32 arch specifies that at the time of processor reset the
3004          * "Accessed" bit in the AR field of segment registers is 1. And qemu
3005          * is setting it to 0 in the usedland code. This causes invalid guest
3006          * state vmexit when "unrestricted guest" mode is turned on.
3007          *    Fix for this setup issue in cpu_reset is being pushed in the qemu
3008          * tree. Newer qemu binaries with that qemu fix would not need this
3009          * kvm hack.
3010          */
3011         if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
3012                 ar |= 0x1; /* Accessed */
3013
3014         vmcs_write32(sf->ar_bytes, ar);
3015         __clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
3016 }
3017
3018 static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3019 {
3020         u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS);
3021
3022         *db = (ar >> 14) & 1;
3023         *l = (ar >> 13) & 1;
3024 }
3025
3026 static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3027 {
3028         dt->size = vmcs_read32(GUEST_IDTR_LIMIT);
3029         dt->address = vmcs_readl(GUEST_IDTR_BASE);
3030 }
3031
3032 static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3033 {
3034         vmcs_write32(GUEST_IDTR_LIMIT, dt->size);
3035         vmcs_writel(GUEST_IDTR_BASE, dt->address);
3036 }
3037
3038 static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3039 {
3040         dt->size = vmcs_read32(GUEST_GDTR_LIMIT);
3041         dt->address = vmcs_readl(GUEST_GDTR_BASE);
3042 }
3043
3044 static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
3045 {
3046         vmcs_write32(GUEST_GDTR_LIMIT, dt->size);
3047         vmcs_writel(GUEST_GDTR_BASE, dt->address);
3048 }
3049
3050 static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
3051 {
3052         struct kvm_segment var;
3053         u32 ar;
3054
3055         vmx_get_segment(vcpu, &var, seg);
3056         ar = vmx_segment_access_rights(&var);
3057
3058         if (var.base != (var.selector << 4))
3059                 return false;
3060         if (var.limit != 0xffff)
3061                 return false;
3062         if (ar != 0xf3)
3063                 return false;
3064
3065         return true;
3066 }
3067
3068 static bool code_segment_valid(struct kvm_vcpu *vcpu)
3069 {
3070         struct kvm_segment cs;
3071         unsigned int cs_rpl;
3072
3073         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
3074         cs_rpl = cs.selector & SELECTOR_RPL_MASK;
3075
3076         if (cs.unusable)
3077                 return false;
3078         if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
3079                 return false;
3080         if (!cs.s)
3081                 return false;
3082         if (cs.type & AR_TYPE_WRITEABLE_MASK) {
3083                 if (cs.dpl > cs_rpl)
3084                         return false;
3085         } else {
3086                 if (cs.dpl != cs_rpl)
3087                         return false;
3088         }
3089         if (!cs.present)
3090                 return false;
3091
3092         /* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
3093         return true;
3094 }
3095
3096 static bool stack_segment_valid(struct kvm_vcpu *vcpu)
3097 {
3098         struct kvm_segment ss;
3099         unsigned int ss_rpl;
3100
3101         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
3102         ss_rpl = ss.selector & SELECTOR_RPL_MASK;
3103
3104         if (ss.unusable)
3105                 return true;
3106         if (ss.type != 3 && ss.type != 7)
3107                 return false;
3108         if (!ss.s)
3109                 return false;
3110         if (ss.dpl != ss_rpl) /* DPL != RPL */
3111                 return false;
3112         if (!ss.present)
3113                 return false;
3114
3115         return true;
3116 }
3117
3118 static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
3119 {
3120         struct kvm_segment var;
3121         unsigned int rpl;
3122
3123         vmx_get_segment(vcpu, &var, seg);
3124         rpl = var.selector & SELECTOR_RPL_MASK;
3125
3126         if (var.unusable)
3127                 return true;
3128         if (!var.s)
3129                 return false;
3130         if (!var.present)
3131                 return false;
3132         if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
3133                 if (var.dpl < rpl) /* DPL < RPL */
3134                         return false;
3135         }
3136
3137         /* TODO: Add other members to kvm_segment_field to allow checking for other access
3138          * rights flags
3139          */
3140         return true;
3141 }
3142
3143 static bool tr_valid(struct kvm_vcpu *vcpu)
3144 {
3145         struct kvm_segment tr;
3146
3147         vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
3148
3149         if (tr.unusable)
3150                 return false;
3151         if (tr.selector & SELECTOR_TI_MASK)     /* TI = 1 */
3152                 return false;
3153         if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
3154                 return false;
3155         if (!tr.present)
3156                 return false;
3157
3158         return true;
3159 }
3160
3161 static bool ldtr_valid(struct kvm_vcpu *vcpu)
3162 {
3163         struct kvm_segment ldtr;
3164
3165         vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
3166
3167         if (ldtr.unusable)
3168                 return true;
3169         if (ldtr.selector & SELECTOR_TI_MASK)   /* TI = 1 */
3170                 return false;
3171         if (ldtr.type != 2)
3172                 return false;
3173         if (!ldtr.present)
3174                 return false;
3175
3176         return true;
3177 }
3178
3179 static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
3180 {
3181         struct kvm_segment cs, ss;
3182
3183         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
3184         vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
3185
3186         return ((cs.selector & SELECTOR_RPL_MASK) ==
3187                  (ss.selector & SELECTOR_RPL_MASK));
3188 }
3189
3190 /*
3191  * Check if guest state is valid. Returns true if valid, false if
3192  * not.
3193  * We assume that registers are always usable
3194  */
3195 static bool guest_state_valid(struct kvm_vcpu *vcpu)
3196 {
3197         /* real mode guest state checks */
3198         if (!is_protmode(vcpu)) {
3199                 if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
3200                         return false;
3201                 if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
3202                         return false;
3203                 if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
3204                         return false;
3205                 if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
3206                         return false;
3207                 if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
3208                         return false;
3209                 if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
3210                         return false;
3211         } else {
3212         /* protected mode guest state checks */
3213                 if (!cs_ss_rpl_check(vcpu))
3214                         return false;
3215                 if (!code_segment_valid(vcpu))
3216                         return false;
3217                 if (!stack_segment_valid(vcpu))
3218                         return false;
3219                 if (!data_segment_valid(vcpu, VCPU_SREG_DS))
3220                         return false;
3221                 if (!data_segment_valid(vcpu, VCPU_SREG_ES))
3222                         return false;
3223                 if (!data_segment_valid(vcpu, VCPU_SREG_FS))
3224                         return false;
3225                 if (!data_segment_valid(vcpu, VCPU_SREG_GS))
3226                         return false;
3227                 if (!tr_valid(vcpu))
3228                         return false;
3229                 if (!ldtr_valid(vcpu))
3230                         return false;
3231         }
3232         /* TODO:
3233          * - Add checks on RIP
3234          * - Add checks on RFLAGS
3235          */
3236
3237         return true;
3238 }
3239
3240 static int init_rmode_tss(struct kvm *kvm)
3241 {
3242         gfn_t fn;
3243         u16 data = 0;
3244         int r, idx, ret = 0;
3245
3246         idx = srcu_read_lock(&kvm->srcu);
3247         fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
3248         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
3249         if (r < 0)
3250                 goto out;
3251         data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
3252         r = kvm_write_guest_page(kvm, fn++, &data,
3253                         TSS_IOPB_BASE_OFFSET, sizeof(u16));
3254         if (r < 0)
3255                 goto out;
3256         r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
3257         if (r < 0)
3258                 goto out;
3259         r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
3260         if (r < 0)
3261                 goto out;
3262         data = ~0;
3263         r = kvm_write_guest_page(kvm, fn, &data,
3264                                  RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
3265                                  sizeof(u8));
3266         if (r < 0)
3267                 goto out;
3268
3269         ret = 1;
3270 out:
3271         srcu_read_unlock(&kvm->srcu, idx);
3272         return ret;
3273 }
3274
3275 static int init_rmode_identity_map(struct kvm *kvm)
3276 {
3277         int i, idx, r, ret;
3278         pfn_t identity_map_pfn;
3279         u32 tmp;
3280
3281         if (!enable_ept)
3282                 return 1;
3283         if (unlikely(!kvm->arch.ept_identity_pagetable)) {
3284                 printk(KERN_ERR "EPT: identity-mapping pagetable "
3285                         "haven't been allocated!\n");
3286                 return 0;
3287         }
3288         if (likely(kvm->arch.ept_identity_pagetable_done))
3289                 return 1;
3290         ret = 0;
3291         identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
3292         idx = srcu_read_lock(&kvm->srcu);
3293         r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
3294         if (r < 0)
3295                 goto out;
3296         /* Set up identity-mapping pagetable for EPT in real mode */
3297         for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
3298                 tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
3299                         _PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
3300                 r = kvm_write_guest_page(kvm, identity_map_pfn,
3301                                 &tmp, i * sizeof(tmp), sizeof(tmp));
3302                 if (r < 0)
3303                         goto out;
3304         }
3305         kvm->arch.ept_identity_pagetable_done = true;
3306         ret = 1;
3307 out:
3308         srcu_read_unlock(&kvm->srcu, idx);
3309         return ret;
3310 }
3311
3312 static void seg_setup(int seg)
3313 {
3314         struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
3315         unsigned int ar;
3316
3317         vmcs_write16(sf->selector, 0);
3318         vmcs_writel(sf->base, 0);
3319         vmcs_write32(sf->limit, 0xffff);
3320         if (enable_unrestricted_guest) {
3321                 ar = 0x93;
3322                 if (seg == VCPU_SREG_CS)
3323                         ar |= 0x08; /* code segment */
3324         } else
3325                 ar = 0xf3;
3326
3327         vmcs_write32(sf->ar_bytes, ar);
3328 }
3329
3330 static int alloc_apic_access_page(struct kvm *kvm)
3331 {
3332         struct kvm_userspace_memory_region kvm_userspace_mem;
3333         int r = 0;
3334
3335         mutex_lock(&kvm->slots_lock);
3336         if (kvm->arch.apic_access_page)
3337                 goto out;
3338         kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
3339         kvm_userspace_mem.flags = 0;
3340         kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
3341         kvm_userspace_mem.memory_size = PAGE_SIZE;
3342         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
3343         if (r)
3344                 goto out;
3345
3346         kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
3347 out:
3348         mutex_unlock(&kvm->slots_lock);
3349         return r;
3350 }
3351
3352 static int alloc_identity_pagetable(struct kvm *kvm)
3353 {
3354         struct kvm_userspace_memory_region kvm_userspace_mem;
3355         int r = 0;
3356
3357         mutex_lock(&kvm->slots_lock);
3358         if (kvm->arch.ept_identity_pagetable)
3359                 goto out;
3360         kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
3361         kvm_userspace_mem.flags = 0;
3362         kvm_userspace_mem.guest_phys_addr =
3363                 kvm->arch.ept_identity_map_addr;
3364         kvm_userspace_mem.memory_size = PAGE_SIZE;
3365         r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
3366         if (r)
3367                 goto out;
3368
3369         kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
3370                         kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
3371 out:
3372         mutex_unlock(&kvm->slots_lock);
3373         return r;
3374 }
3375
3376 static void allocate_vpid(struct vcpu_vmx *vmx)
3377 {
3378         int vpid;
3379
3380         vmx->vpid = 0;
3381         if (!enable_vpid)
3382                 return;
3383         spin_lock(&vmx_vpid_lock);
3384         vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
3385         if (vpid < VMX_NR_VPIDS) {
3386                 vmx->vpid = vpid;
3387                 __set_bit(vpid, vmx_vpid_bitmap);
3388         }
3389         spin_unlock(&vmx_vpid_lock);
3390 }
3391
3392 static void free_vpid(struct vcpu_vmx *vmx)
3393 {
3394         if (!enable_vpid)
3395                 return;
3396         spin_lock(&vmx_vpid_lock);
3397         if (vmx->vpid != 0)
3398                 __clear_bit(vmx->vpid, vmx_vpid_bitmap);
3399         spin_unlock(&vmx_vpid_lock);
3400 }
3401
3402 static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
3403 {
3404         int f = sizeof(unsigned long);
3405
3406         if (!cpu_has_vmx_msr_bitmap())
3407                 return;
3408
3409         /*
3410          * See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
3411          * have the write-low and read-high bitmap offsets the wrong way round.
3412          * We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
3413          */
3414         if (msr <= 0x1fff) {
3415                 __clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
3416                 __clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
3417         } else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
3418                 msr &= 0x1fff;
3419                 __clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
3420                 __clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
3421         }
3422 }
3423
3424 static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
3425 {
3426         if (!longmode_only)
3427                 __vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
3428         __vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
3429 }
3430
3431 /*
3432  * Set up the vmcs's constant host-state fields, i.e., host-state fields that
3433  * will not change in the lifetime of the guest.
3434  * Note that host-state that does change is set elsewhere. E.g., host-state
3435  * that is set differently for each CPU is set in vmx_vcpu_load(), not here.
3436  */
3437 static void vmx_set_constant_host_state(void)
3438 {
3439         u32 low32, high32;
3440         unsigned long tmpl;
3441         struct desc_ptr dt;
3442
3443         vmcs_writel(HOST_CR0, read_cr0() | X86_CR0_TS);  /* 22.2.3 */
3444         vmcs_writel(HOST_CR4, read_cr4());  /* 22.2.3, 22.2.5 */
3445         vmcs_writel(HOST_CR3, read_cr3());  /* 22.2.3  FIXME: shadow tables */
3446
3447         vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS);  /* 22.2.4 */
3448         vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
3449         vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
3450         vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS);  /* 22.2.4 */
3451         vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8);  /* 22.2.4 */
3452
3453         native_store_idt(&dt);
3454         vmcs_writel(HOST_IDTR_BASE, dt.address);   /* 22.2.4 */
3455
3456         asm("mov $.Lkvm_vmx_return, %0" : "=r"(tmpl));
3457         vmcs_writel(HOST_RIP, tmpl); /* 22.2.5 */
3458
3459         rdmsr(MSR_IA32_SYSENTER_CS, low32, high32);
3460         vmcs_write32(HOST_IA32_SYSENTER_CS, low32);
3461         rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl);
3462         vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl);   /* 22.2.3 */
3463
3464         if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
3465                 rdmsr(MSR_IA32_CR_PAT, low32, high32);
3466                 vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32));
3467         }
3468 }
3469
3470 static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx)
3471 {
3472         vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
3473         if (enable_ept)
3474                 vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
3475         if (is_guest_mode(&vmx->vcpu))
3476                 vmx->vcpu.arch.cr4_guest_owned_bits &=
3477                         ~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask;
3478         vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
3479 }
3480
3481 static u32 vmx_exec_control(struct vcpu_vmx *vmx)
3482 {
3483         u32 exec_control = vmcs_config.cpu_based_exec_ctrl;
3484         if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
3485                 exec_control &= ~CPU_BASED_TPR_SHADOW;
3486 #ifdef CONFIG_X86_64
3487                 exec_control |= CPU_BASED_CR8_STORE_EXITING |
3488                                 CPU_BASED_CR8_LOAD_EXITING;
3489 #endif
3490         }
3491         if (!enable_ept)
3492                 exec_control |= CPU_BASED_CR3_STORE_EXITING |
3493                                 CPU_BASED_CR3_LOAD_EXITING  |
3494                                 CPU_BASED_INVLPG_EXITING;
3495         return exec_control;
3496 }
3497
3498 static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
3499 {
3500         u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
3501         if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
3502                 exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
3503         if (vmx->vpid == 0)
3504                 exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
3505         if (!enable_ept) {
3506                 exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
3507                 enable_unrestricted_guest = 0;
3508         }
3509         if (!enable_unrestricted_guest)
3510                 exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
3511         if (!ple_gap)
3512                 exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
3513         return exec_control;
3514 }
3515
3516 /*
3517  * Sets up the vmcs for emulated real mode.
3518  */
3519 static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
3520 {
3521         unsigned long a;
3522         int i;
3523
3524         /* I/O */
3525         vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
3526         vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
3527
3528         if (cpu_has_vmx_msr_bitmap())
3529                 vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
3530
3531         vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
3532
3533         /* Control */
3534         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
3535                 vmcs_config.pin_based_exec_ctrl);
3536
3537         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx));
3538
3539         if (cpu_has_secondary_exec_ctrls()) {
3540                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
3541                                 vmx_secondary_exec_control(vmx));
3542         }
3543
3544         if (ple_gap) {
3545                 vmcs_write32(PLE_GAP, ple_gap);
3546                 vmcs_write32(PLE_WINDOW, ple_window);
3547         }
3548
3549         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, !!bypass_guest_pf);
3550         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, !!bypass_guest_pf);
3551         vmcs_write32(CR3_TARGET_COUNT, 0);           /* 22.2.1 */
3552
3553         vmcs_write16(HOST_FS_SELECTOR, 0);            /* 22.2.4 */
3554         vmcs_write16(HOST_GS_SELECTOR, 0);            /* 22.2.4 */
3555         vmx_set_constant_host_state();
3556 #ifdef CONFIG_X86_64
3557         rdmsrl(MSR_FS_BASE, a);
3558         vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
3559         rdmsrl(MSR_GS_BASE, a);
3560         vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
3561 #else
3562         vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
3563         vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
3564 #endif
3565
3566         vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
3567         vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
3568         vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host));
3569         vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
3570         vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest));
3571
3572         if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
3573                 u32 msr_low, msr_high;
3574                 u64 host_pat;
3575                 rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
3576                 host_pat = msr_low | ((u64) msr_high << 32);
3577                 /* Write the default value follow host pat */
3578                 vmcs_write64(GUEST_IA32_PAT, host_pat);
3579                 /* Keep arch.pat sync with GUEST_IA32_PAT */
3580                 vmx->vcpu.arch.pat = host_pat;
3581         }
3582
3583         for (i = 0; i < NR_VMX_MSR; ++i) {
3584                 u32 index = vmx_msr_index[i];
3585                 u32 data_low, data_high;
3586                 int j = vmx->nmsrs;
3587
3588                 if (rdmsr_safe(index, &data_low, &data_high) < 0)
3589                         continue;
3590                 if (wrmsr_safe(index, data_low, data_high) < 0)
3591                         continue;
3592                 vmx->guest_msrs[j].index = i;
3593                 vmx->guest_msrs[j].data = 0;
3594                 vmx->guest_msrs[j].mask = -1ull;
3595                 ++vmx->nmsrs;
3596         }
3597
3598         vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
3599
3600         /* 22.2.1, 20.8.1 */
3601         vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
3602
3603         vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
3604         set_cr4_guest_host_mask(vmx);
3605
3606         kvm_write_tsc(&vmx->vcpu, 0);
3607
3608         return 0;
3609 }
3610
3611 static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
3612 {
3613         struct vcpu_vmx *vmx = to_vmx(vcpu);
3614         u64 msr;
3615         int ret;
3616
3617         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
3618
3619         vmx->rmode.vm86_active = 0;
3620
3621         vmx->soft_vnmi_blocked = 0;
3622
3623         vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
3624         kvm_set_cr8(&vmx->vcpu, 0);
3625         msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
3626         if (kvm_vcpu_is_bsp(&vmx->vcpu))
3627                 msr |= MSR_IA32_APICBASE_BSP;
3628         kvm_set_apic_base(&vmx->vcpu, msr);
3629
3630         ret = fx_init(&vmx->vcpu);
3631         if (ret != 0)
3632                 goto out;
3633
3634         vmx_segment_cache_clear(vmx);
3635
3636         seg_setup(VCPU_SREG_CS);
3637         /*
3638          * GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
3639          * insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4.  Sigh.
3640          */
3641         if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
3642                 vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
3643                 vmcs_writel(GUEST_CS_BASE, 0x000f0000);
3644         } else {
3645                 vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
3646                 vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
3647         }
3648
3649         seg_setup(VCPU_SREG_DS);
3650         seg_setup(VCPU_SREG_ES);
3651         seg_setup(VCPU_SREG_FS);
3652         seg_setup(VCPU_SREG_GS);
3653         seg_setup(VCPU_SREG_SS);
3654
3655         vmcs_write16(GUEST_TR_SELECTOR, 0);
3656         vmcs_writel(GUEST_TR_BASE, 0);
3657         vmcs_write32(GUEST_TR_LIMIT, 0xffff);
3658         vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
3659
3660         vmcs_write16(GUEST_LDTR_SELECTOR, 0);
3661         vmcs_writel(GUEST_LDTR_BASE, 0);
3662         vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
3663         vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
3664
3665         vmcs_write32(GUEST_SYSENTER_CS, 0);
3666         vmcs_writel(GUEST_SYSENTER_ESP, 0);
3667         vmcs_writel(GUEST_SYSENTER_EIP, 0);
3668
3669         vmcs_writel(GUEST_RFLAGS, 0x02);
3670         if (kvm_vcpu_is_bsp(&vmx->vcpu))
3671                 kvm_rip_write(vcpu, 0xfff0);
3672         else
3673                 kvm_rip_write(vcpu, 0);
3674         kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
3675
3676         vmcs_writel(GUEST_DR7, 0x400);
3677
3678         vmcs_writel(GUEST_GDTR_BASE, 0);
3679         vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
3680
3681         vmcs_writel(GUEST_IDTR_BASE, 0);
3682         vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
3683
3684         vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
3685         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
3686         vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
3687
3688         /* Special registers */
3689         vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
3690
3691         setup_msrs(vmx);
3692
3693         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);  /* 22.2.1 */
3694
3695         if (cpu_has_vmx_tpr_shadow()) {
3696                 vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
3697                 if (vm_need_tpr_shadow(vmx->vcpu.kvm))
3698                         vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
3699                                      __pa(vmx->vcpu.arch.apic->regs));
3700                 vmcs_write32(TPR_THRESHOLD, 0);
3701         }
3702
3703         if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
3704                 vmcs_write64(APIC_ACCESS_ADDR,
3705                              page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
3706
3707         if (vmx->vpid != 0)
3708                 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
3709
3710         vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
3711         vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */
3712         vmx_set_cr4(&vmx->vcpu, 0);
3713         vmx_set_efer(&vmx->vcpu, 0);
3714         vmx_fpu_activate(&vmx->vcpu);
3715         update_exception_bitmap(&vmx->vcpu);
3716
3717         vpid_sync_context(vmx);
3718
3719         ret = 0;
3720
3721         /* HACK: Don't enable emulation on guest boot/reset */
3722         vmx->emulation_required = 0;
3723
3724 out:
3725         return ret;
3726 }
3727
3728 static void enable_irq_window(struct kvm_vcpu *vcpu)
3729 {
3730         u32 cpu_based_vm_exec_control;
3731
3732         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3733         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
3734         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3735 }
3736
3737 static void enable_nmi_window(struct kvm_vcpu *vcpu)
3738 {
3739         u32 cpu_based_vm_exec_control;
3740
3741         if (!cpu_has_virtual_nmis()) {
3742                 enable_irq_window(vcpu);
3743                 return;
3744         }
3745
3746         if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
3747                 enable_irq_window(vcpu);
3748                 return;
3749         }
3750         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
3751         cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
3752         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
3753 }
3754
3755 static void vmx_inject_irq(struct kvm_vcpu *vcpu)
3756 {
3757         struct vcpu_vmx *vmx = to_vmx(vcpu);
3758         uint32_t intr;
3759         int irq = vcpu->arch.interrupt.nr;
3760
3761         trace_kvm_inj_virq(irq);
3762
3763         ++vcpu->stat.irq_injections;
3764         if (vmx->rmode.vm86_active) {
3765                 int inc_eip = 0;
3766                 if (vcpu->arch.interrupt.soft)
3767                         inc_eip = vcpu->arch.event_exit_inst_len;
3768                 if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE)
3769                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
3770                 return;
3771         }
3772         intr = irq | INTR_INFO_VALID_MASK;
3773         if (vcpu->arch.interrupt.soft) {
3774                 intr |= INTR_TYPE_SOFT_INTR;
3775                 vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
3776                              vmx->vcpu.arch.event_exit_inst_len);
3777         } else
3778                 intr |= INTR_TYPE_EXT_INTR;
3779         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
3780         vmx_clear_hlt(vcpu);
3781 }
3782
3783 static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
3784 {
3785         struct vcpu_vmx *vmx = to_vmx(vcpu);
3786
3787         if (!cpu_has_virtual_nmis()) {
3788                 /*
3789                  * Tracking the NMI-blocked state in software is built upon
3790                  * finding the next open IRQ window. This, in turn, depends on
3791                  * well-behaving guests: They have to keep IRQs disabled at
3792                  * least as long as the NMI handler runs. Otherwise we may
3793                  * cause NMI nesting, maybe breaking the guest. But as this is
3794                  * highly unlikely, we can live with the residual risk.
3795                  */
3796                 vmx->soft_vnmi_blocked = 1;
3797                 vmx->vnmi_blocked_time = 0;
3798         }
3799
3800         ++vcpu->stat.nmi_injections;
3801         vmx->nmi_known_unmasked = false;
3802         if (vmx->rmode.vm86_active) {
3803                 if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE)
3804                         kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
3805                 return;
3806         }
3807         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
3808                         INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
3809         vmx_clear_hlt(vcpu);
3810 }
3811
3812 static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
3813 {
3814         if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
3815                 return 0;
3816
3817         return  !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
3818                   (GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI
3819                    | GUEST_INTR_STATE_NMI));
3820 }
3821
3822 static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
3823 {
3824         if (!cpu_has_virtual_nmis())
3825                 return to_vmx(vcpu)->soft_vnmi_blocked;
3826         if (to_vmx(vcpu)->nmi_known_unmasked)
3827                 return false;
3828         return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
3829 }
3830
3831 static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
3832 {
3833         struct vcpu_vmx *vmx = to_vmx(vcpu);
3834
3835         if (!cpu_has_virtual_nmis()) {
3836                 if (vmx->soft_vnmi_blocked != masked) {
3837                         vmx->soft_vnmi_blocked = masked;
3838                         vmx->vnmi_blocked_time = 0;
3839                 }
3840         } else {
3841                 vmx->nmi_known_unmasked = !masked;
3842                 if (masked)
3843                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
3844                                       GUEST_INTR_STATE_NMI);
3845                 else
3846                         vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
3847                                         GUEST_INTR_STATE_NMI);
3848         }
3849 }
3850
3851 static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
3852 {
3853         return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
3854                 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
3855                         (GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
3856 }
3857
3858 static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
3859 {
3860         int ret;
3861         struct kvm_userspace_memory_region tss_mem = {
3862                 .slot = TSS_PRIVATE_MEMSLOT,
3863                 .guest_phys_addr = addr,
3864                 .memory_size = PAGE_SIZE * 3,
3865                 .flags = 0,
3866         };
3867
3868         ret = kvm_set_memory_region(kvm, &tss_mem, 0);
3869         if (ret)
3870                 return ret;
3871         kvm->arch.tss_addr = addr;
3872         if (!init_rmode_tss(kvm))
3873                 return  -ENOMEM;
3874
3875         return 0;
3876 }
3877
3878 static int handle_rmode_exception(struct kvm_vcpu *vcpu,
3879                                   int vec, u32 err_code)
3880 {
3881         /*
3882          * Instruction with address size override prefix opcode 0x67
3883          * Cause the #SS fault with 0 error code in VM86 mode.
3884          */
3885         if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
3886                 if (emulate_instruction(vcpu, 0) == EMULATE_DONE)
3887                         return 1;
3888         /*
3889          * Forward all other exceptions that are valid in real mode.
3890          * FIXME: Breaks guest debugging in real mode, needs to be fixed with
3891          *        the required debugging infrastructure rework.
3892          */
3893         switch (vec) {
3894         case DB_VECTOR:
3895                 if (vcpu->guest_debug &
3896                     (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
3897                         return 0;
3898                 kvm_queue_exception(vcpu, vec);
3899                 return 1;
3900         case BP_VECTOR:
3901                 /*
3902                  * Update instruction length as we may reinject the exception
3903                  * from user space while in guest debugging mode.
3904                  */
3905                 to_vmx(vcpu)->vcpu.arch.event_exit_inst_len =
3906                         vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
3907                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
3908                         return 0;
3909                 /* fall through */
3910         case DE_VECTOR:
3911         case OF_VECTOR:
3912         case BR_VECTOR:
3913         case UD_VECTOR:
3914         case DF_VECTOR:
3915         case SS_VECTOR:
3916         case GP_VECTOR:
3917         case MF_VECTOR:
3918                 kvm_queue_exception(vcpu, vec);
3919                 return 1;
3920         }
3921         return 0;
3922 }
3923
3924 /*
3925  * Trigger machine check on the host. We assume all the MSRs are already set up
3926  * by the CPU and that we still run on the same CPU as the MCE occurred on.
3927  * We pass a fake environment to the machine check handler because we want
3928  * the guest to be always treated like user space, no matter what context
3929  * it used internally.
3930  */
3931 static void kvm_machine_check(void)
3932 {
3933 #if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
3934         struct pt_regs regs = {
3935                 .cs = 3, /* Fake ring 3 no matter what the guest ran on */
3936                 .flags = X86_EFLAGS_IF,
3937         };
3938
3939         do_machine_check(&regs, 0);
3940 #endif
3941 }
3942
3943 static int handle_machine_check(struct kvm_vcpu *vcpu)
3944 {
3945         /* already handled by vcpu_run */
3946         return 1;
3947 }
3948
3949 static int handle_exception(struct kvm_vcpu *vcpu)
3950 {
3951         struct vcpu_vmx *vmx = to_vmx(vcpu);
3952         struct kvm_run *kvm_run = vcpu->run;
3953         u32 intr_info, ex_no, error_code;
3954         unsigned long cr2, rip, dr6;
3955         u32 vect_info;
3956         enum emulation_result er;
3957
3958         vect_info = vmx->idt_vectoring_info;
3959         intr_info = vmx->exit_intr_info;
3960
3961         if (is_machine_check(intr_info))
3962                 return handle_machine_check(vcpu);
3963
3964         if ((vect_info & VECTORING_INFO_VALID_MASK) &&
3965             !is_page_fault(intr_info)) {
3966                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
3967                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX;
3968                 vcpu->run->internal.ndata = 2;
3969                 vcpu->run->internal.data[0] = vect_info;
3970                 vcpu->run->internal.data[1] = intr_info;
3971                 return 0;
3972         }
3973
3974         if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
3975                 return 1;  /* already handled by vmx_vcpu_run() */
3976
3977         if (is_no_device(intr_info)) {
3978                 vmx_fpu_activate(vcpu);
3979                 return 1;
3980         }
3981
3982         if (is_invalid_opcode(intr_info)) {
3983                 er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
3984                 if (er != EMULATE_DONE)
3985                         kvm_queue_exception(vcpu, UD_VECTOR);
3986                 return 1;
3987         }
3988
3989         error_code = 0;
3990         if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
3991                 error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
3992         if (is_page_fault(intr_info)) {
3993                 /* EPT won't cause page fault directly */
3994                 if (enable_ept)
3995                         BUG();
3996                 cr2 = vmcs_readl(EXIT_QUALIFICATION);
3997                 trace_kvm_page_fault(cr2, error_code);
3998
3999                 if (kvm_event_needs_reinjection(vcpu))
4000                         kvm_mmu_unprotect_page_virt(vcpu, cr2);
4001                 return kvm_mmu_page_fault(vcpu, cr2, error_code, NULL, 0);
4002         }
4003
4004         if (vmx->rmode.vm86_active &&
4005             handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
4006                                                                 error_code)) {
4007                 if (vcpu->arch.halt_request) {
4008                         vcpu->arch.halt_request = 0;
4009                         return kvm_emulate_halt(vcpu);
4010                 }
4011                 return 1;
4012         }
4013
4014         ex_no = intr_info & INTR_INFO_VECTOR_MASK;
4015         switch (ex_no) {
4016         case DB_VECTOR:
4017                 dr6 = vmcs_readl(EXIT_QUALIFICATION);
4018                 if (!(vcpu->guest_debug &
4019                       (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
4020                         vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
4021                         kvm_queue_exception(vcpu, DB_VECTOR);
4022                         return 1;
4023                 }
4024                 kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
4025                 kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
4026                 /* fall through */
4027         case BP_VECTOR:
4028                 /*
4029                  * Update instruction length as we may reinject #BP from
4030                  * user space while in guest debugging mode. Reading it for
4031                  * #DB as well causes no harm, it is not used in that case.
4032                  */
4033                 vmx->vcpu.arch.event_exit_inst_len =
4034                         vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
4035                 kvm_run->exit_reason = KVM_EXIT_DEBUG;
4036                 rip = kvm_rip_read(vcpu);
4037                 kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
4038                 kvm_run->debug.arch.exception = ex_no;
4039                 break;
4040         default:
4041                 kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
4042                 kvm_run->ex.exception = ex_no;
4043                 kvm_run->ex.error_code = error_code;
4044                 break;
4045         }
4046         return 0;
4047 }
4048
4049 static int handle_external_interrupt(struct kvm_vcpu *vcpu)
4050 {
4051         ++vcpu->stat.irq_exits;
4052         return 1;
4053 }
4054
4055 static int handle_triple_fault(struct kvm_vcpu *vcpu)
4056 {
4057         vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
4058         return 0;
4059 }
4060
4061 static int handle_io(struct kvm_vcpu *vcpu)
4062 {
4063         unsigned long exit_qualification;
4064         int size, in, string;
4065         unsigned port;
4066
4067         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4068         string = (exit_qualification & 16) != 0;
4069         in = (exit_qualification & 8) != 0;
4070
4071         ++vcpu->stat.io_exits;
4072
4073         if (string || in)
4074                 return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4075
4076         port = exit_qualification >> 16;
4077         size = (exit_qualification & 7) + 1;
4078         skip_emulated_instruction(vcpu);
4079
4080         return kvm_fast_pio_out(vcpu, size, port);
4081 }
4082
4083 static void
4084 vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
4085 {
4086         /*
4087          * Patch in the VMCALL instruction:
4088          */
4089         hypercall[0] = 0x0f;
4090         hypercall[1] = 0x01;
4091         hypercall[2] = 0xc1;
4092 }
4093
4094 static int handle_cr(struct kvm_vcpu *vcpu)
4095 {
4096         unsigned long exit_qualification, val;
4097         int cr;
4098         int reg;
4099         int err;
4100
4101         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4102         cr = exit_qualification & 15;
4103         reg = (exit_qualification >> 8) & 15;
4104         switch ((exit_qualification >> 4) & 3) {
4105         case 0: /* mov to cr */
4106                 val = kvm_register_read(vcpu, reg);
4107                 trace_kvm_cr_write(cr, val);
4108                 switch (cr) {
4109                 case 0:
4110                         err = kvm_set_cr0(vcpu, val);
4111                         kvm_complete_insn_gp(vcpu, err);
4112                         return 1;
4113                 case 3:
4114                         err = kvm_set_cr3(vcpu, val);
4115                         kvm_complete_insn_gp(vcpu, err);
4116                         return 1;
4117                 case 4:
4118                         err = kvm_set_cr4(vcpu, val);
4119                         kvm_complete_insn_gp(vcpu, err);
4120                         return 1;
4121                 case 8: {
4122                                 u8 cr8_prev = kvm_get_cr8(vcpu);
4123                                 u8 cr8 = kvm_register_read(vcpu, reg);
4124                                 err = kvm_set_cr8(vcpu, cr8);
4125                                 kvm_complete_insn_gp(vcpu, err);
4126                                 if (irqchip_in_kernel(vcpu->kvm))
4127                                         return 1;
4128                                 if (cr8_prev <= cr8)
4129                                         return 1;
4130                                 vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
4131                                 return 0;
4132                         }
4133                 };
4134                 break;
4135         case 2: /* clts */
4136                 vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
4137                 trace_kvm_cr_write(0, kvm_read_cr0(vcpu));
4138                 skip_emulated_instruction(vcpu);
4139                 vmx_fpu_activate(vcpu);
4140                 return 1;
4141         case 1: /*mov from cr*/
4142                 switch (cr) {
4143                 case 3:
4144                         val = kvm_read_cr3(vcpu);
4145                         kvm_register_write(vcpu, reg, val);
4146                         trace_kvm_cr_read(cr, val);
4147                         skip_emulated_instruction(vcpu);
4148                         return 1;
4149                 case 8:
4150                         val = kvm_get_cr8(vcpu);
4151                         kvm_register_write(vcpu, reg, val);
4152                         trace_kvm_cr_read(cr, val);
4153                         skip_emulated_instruction(vcpu);
4154                         return 1;
4155                 }
4156                 break;
4157         case 3: /* lmsw */
4158                 val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
4159                 trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val);
4160                 kvm_lmsw(vcpu, val);
4161
4162                 skip_emulated_instruction(vcpu);
4163                 return 1;
4164         default:
4165                 break;
4166         }
4167         vcpu->run->exit_reason = 0;
4168         pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
4169                (int)(exit_qualification >> 4) & 3, cr);
4170         return 0;
4171 }
4172
4173 static int handle_dr(struct kvm_vcpu *vcpu)
4174 {
4175         unsigned long exit_qualification;
4176         int dr, reg;
4177
4178         /* Do not handle if the CPL > 0, will trigger GP on re-entry */
4179         if (!kvm_require_cpl(vcpu, 0))
4180                 return 1;
4181         dr = vmcs_readl(GUEST_DR7);
4182         if (dr & DR7_GD) {
4183                 /*
4184                  * As the vm-exit takes precedence over the debug trap, we
4185                  * need to emulate the latter, either for the host or the
4186                  * guest debugging itself.
4187                  */
4188                 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
4189                         vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
4190                         vcpu->run->debug.arch.dr7 = dr;
4191                         vcpu->run->debug.arch.pc =
4192                                 vmcs_readl(GUEST_CS_BASE) +
4193                                 vmcs_readl(GUEST_RIP);
4194                         vcpu->run->debug.arch.exception = DB_VECTOR;
4195                         vcpu->run->exit_reason = KVM_EXIT_DEBUG;
4196                         return 0;
4197                 } else {
4198                         vcpu->arch.dr7 &= ~DR7_GD;
4199                         vcpu->arch.dr6 |= DR6_BD;
4200                         vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
4201                         kvm_queue_exception(vcpu, DB_VECTOR);
4202                         return 1;
4203                 }
4204         }
4205
4206         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4207         dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
4208         reg = DEBUG_REG_ACCESS_REG(exit_qualification);
4209         if (exit_qualification & TYPE_MOV_FROM_DR) {
4210                 unsigned long val;
4211                 if (!kvm_get_dr(vcpu, dr, &val))
4212                         kvm_register_write(vcpu, reg, val);
4213         } else
4214                 kvm_set_dr(vcpu, dr, vcpu->arch.regs[reg]);
4215         skip_emulated_instruction(vcpu);
4216         return 1;
4217 }
4218
4219 static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val)
4220 {
4221         vmcs_writel(GUEST_DR7, val);
4222 }
4223
4224 static int handle_cpuid(struct kvm_vcpu *vcpu)
4225 {
4226         kvm_emulate_cpuid(vcpu);
4227         return 1;
4228 }
4229
4230 static int handle_rdmsr(struct kvm_vcpu *vcpu)
4231 {
4232         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
4233         u64 data;
4234
4235         if (vmx_get_msr(vcpu, ecx, &data)) {
4236                 trace_kvm_msr_read_ex(ecx);
4237                 kvm_inject_gp(vcpu, 0);
4238                 return 1;
4239         }
4240
4241         trace_kvm_msr_read(ecx, data);
4242
4243         /* FIXME: handling of bits 32:63 of rax, rdx */
4244         vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
4245         vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
4246         skip_emulated_instruction(vcpu);
4247         return 1;
4248 }
4249
4250 static int handle_wrmsr(struct kvm_vcpu *vcpu)
4251 {
4252         u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
4253         u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
4254                 | ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
4255
4256         if (vmx_set_msr(vcpu, ecx, data) != 0) {
4257                 trace_kvm_msr_write_ex(ecx, data);
4258                 kvm_inject_gp(vcpu, 0);
4259                 return 1;
4260         }
4261
4262         trace_kvm_msr_write(ecx, data);
4263         skip_emulated_instruction(vcpu);
4264         return 1;
4265 }
4266
4267 static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
4268 {
4269         kvm_make_request(KVM_REQ_EVENT, vcpu);
4270         return 1;
4271 }
4272
4273 static int handle_interrupt_window(struct kvm_vcpu *vcpu)
4274 {
4275         u32 cpu_based_vm_exec_control;
4276
4277         /* clear pending irq */
4278         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4279         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
4280         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
4281
4282         kvm_make_request(KVM_REQ_EVENT, vcpu);
4283
4284         ++vcpu->stat.irq_window_exits;
4285
4286         /*
4287          * If the user space waits to inject interrupts, exit as soon as
4288          * possible
4289          */
4290         if (!irqchip_in_kernel(vcpu->kvm) &&
4291             vcpu->run->request_interrupt_window &&
4292             !kvm_cpu_has_interrupt(vcpu)) {
4293                 vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
4294                 return 0;
4295         }
4296         return 1;
4297 }
4298
4299 static int handle_halt(struct kvm_vcpu *vcpu)
4300 {
4301         skip_emulated_instruction(vcpu);
4302         return kvm_emulate_halt(vcpu);
4303 }
4304
4305 static int handle_vmcall(struct kvm_vcpu *vcpu)
4306 {
4307         skip_emulated_instruction(vcpu);
4308         kvm_emulate_hypercall(vcpu);
4309         return 1;
4310 }
4311
4312 static int handle_vmx_insn(struct kvm_vcpu *vcpu)
4313 {
4314         kvm_queue_exception(vcpu, UD_VECTOR);
4315         return 1;
4316 }
4317
4318 static int handle_invd(struct kvm_vcpu *vcpu)
4319 {
4320         return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4321 }
4322
4323 static int handle_invlpg(struct kvm_vcpu *vcpu)
4324 {
4325         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4326
4327         kvm_mmu_invlpg(vcpu, exit_qualification);
4328         skip_emulated_instruction(vcpu);
4329         return 1;
4330 }
4331
4332 static int handle_wbinvd(struct kvm_vcpu *vcpu)
4333 {
4334         skip_emulated_instruction(vcpu);
4335         kvm_emulate_wbinvd(vcpu);
4336         return 1;
4337 }
4338
4339 static int handle_xsetbv(struct kvm_vcpu *vcpu)
4340 {
4341         u64 new_bv = kvm_read_edx_eax(vcpu);
4342         u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
4343
4344         if (kvm_set_xcr(vcpu, index, new_bv) == 0)
4345                 skip_emulated_instruction(vcpu);
4346         return 1;
4347 }
4348
4349 static int handle_apic_access(struct kvm_vcpu *vcpu)
4350 {
4351         return emulate_instruction(vcpu, 0) == EMULATE_DONE;
4352 }
4353
4354 static int handle_task_switch(struct kvm_vcpu *vcpu)
4355 {
4356         struct vcpu_vmx *vmx = to_vmx(vcpu);
4357         unsigned long exit_qualification;
4358         bool has_error_code = false;
4359         u32 error_code = 0;
4360         u16 tss_selector;
4361         int reason, type, idt_v;
4362
4363         idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
4364         type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
4365
4366         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4367
4368         reason = (u32)exit_qualification >> 30;
4369         if (reason == TASK_SWITCH_GATE && idt_v) {
4370                 switch (type) {
4371                 case INTR_TYPE_NMI_INTR:
4372                         vcpu->arch.nmi_injected = false;
4373                         vmx_set_nmi_mask(vcpu, true);
4374                         break;
4375                 case INTR_TYPE_EXT_INTR:
4376                 case INTR_TYPE_SOFT_INTR:
4377                         kvm_clear_interrupt_queue(vcpu);
4378                         break;
4379                 case INTR_TYPE_HARD_EXCEPTION:
4380                         if (vmx->idt_vectoring_info &
4381                             VECTORING_INFO_DELIVER_CODE_MASK) {
4382                                 has_error_code = true;
4383                                 error_code =
4384                                         vmcs_read32(IDT_VECTORING_ERROR_CODE);
4385                         }
4386                         /* fall through */
4387                 case INTR_TYPE_SOFT_EXCEPTION:
4388                         kvm_clear_exception_queue(vcpu);
4389                         break;
4390                 default:
4391                         break;
4392                 }
4393         }
4394         tss_selector = exit_qualification;
4395
4396         if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
4397                        type != INTR_TYPE_EXT_INTR &&
4398                        type != INTR_TYPE_NMI_INTR))
4399                 skip_emulated_instruction(vcpu);
4400
4401         if (kvm_task_switch(vcpu, tss_selector, reason,
4402                                 has_error_code, error_code) == EMULATE_FAIL) {
4403                 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4404                 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4405                 vcpu->run->internal.ndata = 0;
4406                 return 0;
4407         }
4408
4409         /* clear all local breakpoint enable flags */
4410         vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
4411
4412         /*
4413          * TODO: What about debug traps on tss switch?
4414          *       Are we supposed to inject them and update dr6?
4415          */
4416
4417         return 1;
4418 }
4419
4420 static int handle_ept_violation(struct kvm_vcpu *vcpu)
4421 {
4422         unsigned long exit_qualification;
4423         gpa_t gpa;
4424         int gla_validity;
4425
4426         exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
4427
4428         if (exit_qualification & (1 << 6)) {
4429                 printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
4430                 return -EINVAL;
4431         }
4432
4433         gla_validity = (exit_qualification >> 7) & 0x3;
4434         if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
4435                 printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
4436                 printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
4437                         (long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
4438                         vmcs_readl(GUEST_LINEAR_ADDRESS));
4439                 printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
4440                         (long unsigned int)exit_qualification);
4441                 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
4442                 vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
4443                 return 0;
4444         }
4445
4446         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
4447         trace_kvm_page_fault(gpa, exit_qualification);
4448         return kvm_mmu_page_fault(vcpu, gpa, exit_qualification & 0x3, NULL, 0);
4449 }
4450
4451 static u64 ept_rsvd_mask(u64 spte, int level)
4452 {
4453         int i;
4454         u64 mask = 0;
4455
4456         for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
4457                 mask |= (1ULL << i);
4458
4459         if (level > 2)
4460                 /* bits 7:3 reserved */
4461                 mask |= 0xf8;
4462         else if (level == 2) {
4463                 if (spte & (1ULL << 7))
4464                         /* 2MB ref, bits 20:12 reserved */
4465                         mask |= 0x1ff000;
4466                 else
4467                         /* bits 6:3 reserved */
4468                         mask |= 0x78;
4469         }
4470
4471         return mask;
4472 }
4473
4474 static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
4475                                        int level)
4476 {
4477         printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);
4478
4479         /* 010b (write-only) */
4480         WARN_ON((spte & 0x7) == 0x2);
4481
4482         /* 110b (write/execute) */
4483         WARN_ON((spte & 0x7) == 0x6);
4484
4485         /* 100b (execute-only) and value not supported by logical processor */
4486         if (!cpu_has_vmx_ept_execute_only())
4487                 WARN_ON((spte & 0x7) == 0x4);
4488
4489         /* not 000b */
4490         if ((spte & 0x7)) {
4491                 u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);
4492
4493                 if (rsvd_bits != 0) {
4494                         printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
4495                                          __func__, rsvd_bits);
4496                         WARN_ON(1);
4497                 }
4498
4499                 if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) {
4500                         u64 ept_mem_type = (spte & 0x38) >> 3;
4501
4502                         if (ept_mem_type == 2 || ept_mem_type == 3 ||
4503                             ept_mem_type == 7) {
4504                                 printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
4505                                                 __func__, ept_mem_type);
4506                                 WARN_ON(1);
4507                         }
4508                 }
4509         }
4510 }
4511
4512 static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
4513 {
4514         u64 sptes[4];
4515         int nr_sptes, i;
4516         gpa_t gpa;
4517
4518         gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
4519
4520         printk(KERN_ERR "EPT: Misconfiguration.\n");
4521         printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);
4522
4523         nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);
4524
4525         for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
4526                 ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);
4527
4528         vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
4529         vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
4530
4531         return 0;
4532 }
4533
4534 static int handle_nmi_window(struct kvm_vcpu *vcpu)
4535 {
4536         u32 cpu_based_vm_exec_control;
4537
4538         /* clear pending NMI */
4539         cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4540         cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
4541         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
4542         ++vcpu->stat.nmi_window_exits;
4543         kvm_make_request(KVM_REQ_EVENT, vcpu);
4544
4545         return 1;
4546 }
4547
4548 static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
4549 {
4550         struct vcpu_vmx *vmx = to_vmx(vcpu);
4551         enum emulation_result err = EMULATE_DONE;
4552         int ret = 1;
4553         u32 cpu_exec_ctrl;
4554         bool intr_window_requested;
4555
4556         cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
4557         intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
4558
4559         while (!guest_state_valid(vcpu)) {
4560                 if (intr_window_requested
4561                     && (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
4562                         return handle_interrupt_window(&vmx->vcpu);
4563
4564                 err = emulate_instruction(vcpu, 0);
4565
4566                 if (err == EMULATE_DO_MMIO) {
4567                         ret = 0;
4568                         goto out;
4569                 }
4570
4571                 if (err != EMULATE_DONE)
4572                         return 0;
4573
4574                 if (signal_pending(current))
4575                         goto out;
4576                 if (need_resched())
4577                         schedule();
4578         }
4579
4580         vmx->emulation_required = 0;
4581 out:
4582         return ret;
4583 }
4584
4585 /*
4586  * Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
4587  * exiting, so only get here on cpu with PAUSE-Loop-Exiting.
4588  */
4589 static int handle_pause(struct kvm_vcpu *vcpu)
4590 {
4591         skip_emulated_instruction(vcpu);
4592         kvm_vcpu_on_spin(vcpu);
4593
4594         return 1;
4595 }
4596
4597 static int handle_invalid_op(struct kvm_vcpu *vcpu)
4598 {
4599         kvm_queue_exception(vcpu, UD_VECTOR);
4600         return 1;
4601 }
4602
4603 /*
4604  * To run an L2 guest, we need a vmcs02 based on the L1-specified vmcs12.
4605  * We could reuse a single VMCS for all the L2 guests, but we also want the
4606  * option to allocate a separate vmcs02 for each separate loaded vmcs12 - this
4607  * allows keeping them loaded on the processor, and in the future will allow
4608  * optimizations where prepare_vmcs02 doesn't need to set all the fields on
4609  * every entry if they never change.
4610  * So we keep, in vmx->nested.vmcs02_pool, a cache of size VMCS02_POOL_SIZE
4611  * (>=0) with a vmcs02 for each recently loaded vmcs12s, most recent first.
4612  *
4613  * The following functions allocate and free a vmcs02 in this pool.
4614  */
4615
4616 /* Get a VMCS from the pool to use as vmcs02 for the current vmcs12. */
4617 static struct loaded_vmcs *nested_get_current_vmcs02(struct vcpu_vmx *vmx)
4618 {
4619         struct vmcs02_list *item;
4620         list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
4621                 if (item->vmptr == vmx->nested.current_vmptr) {
4622                         list_move(&item->list, &vmx->nested.vmcs02_pool);
4623                         return &item->vmcs02;
4624                 }
4625
4626         if (vmx->nested.vmcs02_num >= max(VMCS02_POOL_SIZE, 1)) {
4627                 /* Recycle the least recently used VMCS. */
4628                 item = list_entry(vmx->nested.vmcs02_pool.prev,
4629                         struct vmcs02_list, list);
4630                 item->vmptr = vmx->nested.current_vmptr;
4631                 list_move(&item->list, &vmx->nested.vmcs02_pool);
4632                 return &item->vmcs02;
4633         }
4634
4635         /* Create a new VMCS */
4636         item = (struct vmcs02_list *)
4637                 kmalloc(sizeof(struct vmcs02_list), GFP_KERNEL);
4638         if (!item)
4639                 return NULL;
4640         item->vmcs02.vmcs = alloc_vmcs();
4641         if (!item->vmcs02.vmcs) {
4642                 kfree(item);
4643                 return NULL;
4644         }
4645         loaded_vmcs_init(&item->vmcs02);
4646         item->vmptr = vmx->nested.current_vmptr;
4647         list_add(&(item->list), &(vmx->nested.vmcs02_pool));
4648         vmx->nested.vmcs02_num++;
4649         return &item->vmcs02;
4650 }
4651
4652 /* Free and remove from pool a vmcs02 saved for a vmcs12 (if there is one) */
4653 static void nested_free_vmcs02(struct vcpu_vmx *vmx, gpa_t vmptr)
4654 {
4655         struct vmcs02_list *item;
4656         list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
4657                 if (item->vmptr == vmptr) {
4658                         free_loaded_vmcs(&item->vmcs02);
4659                         list_del(&item->list);
4660                         kfree(item);
4661                         vmx->nested.vmcs02_num--;
4662                         return;
4663                 }
4664 }
4665
4666 /*
4667  * Free all VMCSs saved for this vcpu, except the one pointed by
4668  * vmx->loaded_vmcs. These include the VMCSs in vmcs02_pool (except the one
4669  * currently used, if running L2), and vmcs01 when running L2.
4670  */
4671 static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx)
4672 {
4673         struct vmcs02_list *item, *n;
4674         list_for_each_entry_safe(item, n, &vmx->nested.vmcs02_pool, list) {
4675                 if (vmx->loaded_vmcs != &item->vmcs02)
4676                         free_loaded_vmcs(&item->vmcs02);
4677                 list_del(&item->list);
4678                 kfree(item);
4679         }
4680         vmx->nested.vmcs02_num = 0;
4681
4682         if (vmx->loaded_vmcs != &vmx->vmcs01)
4683                 free_loaded_vmcs(&vmx->vmcs01);
4684 }
4685
4686 /*
4687  * Emulate the VMXON instruction.
4688  * Currently, we just remember that VMX is active, and do not save or even
4689  * inspect the argument to VMXON (the so-called "VMXON pointer") because we
4690  * do not currently need to store anything in that guest-allocated memory
4691  * region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their
4692  * argument is different from the VMXON pointer (which the spec says they do).
4693  */
4694 static int handle_vmon(struct kvm_vcpu *vcpu)
4695 {
4696         struct kvm_segment cs;
4697         struct vcpu_vmx *vmx = to_vmx(vcpu);
4698
4699         /* The Intel VMX Instruction Reference lists a bunch of bits that
4700          * are prerequisite to running VMXON, most notably cr4.VMXE must be
4701          * set to 1 (see vmx_set_cr4() for when we allow the guest to set this).
4702          * Otherwise, we should fail with #UD. We test these now:
4703          */
4704         if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE) ||
4705             !kvm_read_cr0_bits(vcpu, X86_CR0_PE) ||
4706             (vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) {
4707                 kvm_queue_exception(vcpu, UD_VECTOR);
4708                 return 1;
4709         }
4710
4711         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
4712         if (is_long_mode(vcpu) && !cs.l) {
4713                 kvm_queue_exception(vcpu, UD_VECTOR);
4714                 return 1;
4715         }
4716
4717         if (vmx_get_cpl(vcpu)) {
4718                 kvm_inject_gp(vcpu, 0);
4719                 return 1;
4720         }
4721
4722         INIT_LIST_HEAD(&(vmx->nested.vmcs02_pool));
4723         vmx->nested.vmcs02_num = 0;
4724
4725         vmx->nested.vmxon = true;
4726
4727         skip_emulated_instruction(vcpu);
4728         return 1;
4729 }
4730
4731 /*
4732  * Intel's VMX Instruction Reference specifies a common set of prerequisites
4733  * for running VMX instructions (except VMXON, whose prerequisites are
4734  * slightly different). It also specifies what exception to inject otherwise.
4735  */
4736 static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
4737 {
4738         struct kvm_segment cs;
4739         struct vcpu_vmx *vmx = to_vmx(vcpu);
4740
4741         if (!vmx->nested.vmxon) {
4742                 kvm_queue_exception(vcpu, UD_VECTOR);
4743                 return 0;
4744         }
4745
4746         vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
4747         if ((vmx_get_rflags(vcpu) & X86_EFLAGS_VM) ||
4748             (is_long_mode(vcpu) && !cs.l)) {
4749                 kvm_queue_exception(vcpu, UD_VECTOR);
4750                 return 0;
4751         }
4752
4753         if (vmx_get_cpl(vcpu)) {
4754                 kvm_inject_gp(vcpu, 0);
4755                 return 0;
4756         }
4757
4758         return 1;
4759 }
4760
4761 /*
4762  * Free whatever needs to be freed from vmx->nested when L1 goes down, or
4763  * just stops using VMX.
4764  */
4765 static void free_nested(struct vcpu_vmx *vmx)
4766 {
4767         if (!vmx->nested.vmxon)
4768                 return;
4769         vmx->nested.vmxon = false;
4770         if (vmx->nested.current_vmptr != -1ull) {
4771                 kunmap(vmx->nested.current_vmcs12_page);
4772                 nested_release_page(vmx->nested.current_vmcs12_page);
4773                 vmx->nested.current_vmptr = -1ull;
4774                 vmx->nested.current_vmcs12 = NULL;
4775         }
4776         /* Unpin physical memory we referred to in current vmcs02 */
4777         if (vmx->nested.apic_access_page) {
4778                 nested_release_page(vmx->nested.apic_access_page);
4779                 vmx->nested.apic_access_page = 0;
4780         }
4781
4782         nested_free_all_saved_vmcss(vmx);
4783 }
4784
4785 /* Emulate the VMXOFF instruction */
4786 static int handle_vmoff(struct kvm_vcpu *vcpu)
4787 {
4788         if (!nested_vmx_check_permission(vcpu))
4789                 return 1;
4790         free_nested(to_vmx(vcpu));
4791         skip_emulated_instruction(vcpu);
4792         return 1;
4793 }
4794
4795 /*
4796  * Decode the memory-address operand of a vmx instruction, as recorded on an
4797  * exit caused by such an instruction (run by a guest hypervisor).
4798  * On success, returns 0. When the operand is invalid, returns 1 and throws
4799  * #UD or #GP.
4800  */
4801 static int get_vmx_mem_address(struct kvm_vcpu *vcpu,
4802                                  unsigned long exit_qualification,
4803                                  u32 vmx_instruction_info, gva_t *ret)
4804 {
4805         /*
4806          * According to Vol. 3B, "Information for VM Exits Due to Instruction
4807          * Execution", on an exit, vmx_instruction_info holds most of the
4808          * addressing components of the operand. Only the displacement part
4809          * is put in exit_qualification (see 3B, "Basic VM-Exit Information").
4810          * For how an actual address is calculated from all these components,
4811          * refer to Vol. 1, "Operand Addressing".
4812          */
4813         int  scaling = vmx_instruction_info & 3;
4814         int  addr_size = (vmx_instruction_info >> 7) & 7;
4815         bool is_reg = vmx_instruction_info & (1u << 10);
4816         int  seg_reg = (vmx_instruction_info >> 15) & 7;
4817         int  index_reg = (vmx_instruction_info >> 18) & 0xf;
4818         bool index_is_valid = !(vmx_instruction_info & (1u << 22));
4819         int  base_reg       = (vmx_instruction_info >> 23) & 0xf;
4820         bool base_is_valid  = !(vmx_instruction_info & (1u << 27));
4821
4822         if (is_reg) {
4823                 kvm_queue_exception(vcpu, UD_VECTOR);
4824                 return 1;
4825         }
4826
4827         /* Addr = segment_base + offset */
4828         /* offset = base + [index * scale] + displacement */
4829         *ret = vmx_get_segment_base(vcpu, seg_reg);
4830         if (base_is_valid)
4831                 *ret += kvm_register_read(vcpu, base_reg);
4832         if (index_is_valid)
4833                 *ret += kvm_register_read(vcpu, index_reg)<<scaling;
4834         *ret += exit_qualification; /* holds the displacement */
4835
4836         if (addr_size == 1) /* 32 bit */
4837                 *ret &= 0xffffffff;
4838
4839         /*
4840          * TODO: throw #GP (and return 1) in various cases that the VM*
4841          * instructions require it - e.g., offset beyond segment limit,
4842          * unusable or unreadable/unwritable segment, non-canonical 64-bit
4843          * address, and so on. Currently these are not checked.
4844          */
4845         return 0;
4846 }
4847
4848 /*
4849  * The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
4850  * set the success or error code of an emulated VMX instruction, as specified
4851  * by Vol 2B, VMX Instruction Reference, "Conventions".
4852  */
4853 static void nested_vmx_succeed(struct kvm_vcpu *vcpu)
4854 {
4855         vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
4856                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
4857                             X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
4858 }
4859
4860 static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
4861 {
4862         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
4863                         & ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
4864                             X86_EFLAGS_SF | X86_EFLAGS_OF))
4865                         | X86_EFLAGS_CF);
4866 }
4867
4868 static void nested_vmx_failValid(struct kvm_vcpu *vcpu,
4869                                         u32 vm_instruction_error)
4870 {
4871         if (to_vmx(vcpu)->nested.current_vmptr == -1ull) {
4872                 /*
4873                  * failValid writes the error number to the current VMCS, which
4874                  * can't be done there isn't a current VMCS.
4875                  */
4876                 nested_vmx_failInvalid(vcpu);
4877                 return;
4878         }
4879         vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
4880                         & ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
4881                             X86_EFLAGS_SF | X86_EFLAGS_OF))
4882                         | X86_EFLAGS_ZF);
4883         get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
4884 }
4885
4886 /* Emulate the VMCLEAR instruction */
4887 static int handle_vmclear(struct kvm_vcpu *vcpu)
4888 {
4889         struct vcpu_vmx *vmx = to_vmx(vcpu);
4890         gva_t gva;
4891         gpa_t vmptr;
4892         struct vmcs12 *vmcs12;
4893         struct page *page;
4894         struct x86_exception e;
4895
4896         if (!nested_vmx_check_permission(vcpu))
4897                 return 1;
4898
4899         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
4900                         vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
4901                 return 1;
4902
4903         if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
4904                                 sizeof(vmptr), &e)) {
4905                 kvm_inject_page_fault(vcpu, &e);
4906                 return 1;
4907         }
4908
4909         if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {
4910                 nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);
4911                 skip_emulated_instruction(vcpu);
4912                 return 1;
4913         }
4914
4915         if (vmptr == vmx->nested.current_vmptr) {
4916                 kunmap(vmx->nested.current_vmcs12_page);
4917                 nested_release_page(vmx->nested.current_vmcs12_page);
4918                 vmx->nested.current_vmptr = -1ull;
4919                 vmx->nested.current_vmcs12 = NULL;
4920         }
4921
4922         page = nested_get_page(vcpu, vmptr);
4923         if (page == NULL) {
4924                 /*
4925                  * For accurate processor emulation, VMCLEAR beyond available
4926                  * physical memory should do nothing at all. However, it is
4927                  * possible that a nested vmx bug, not a guest hypervisor bug,
4928                  * resulted in this case, so let's shut down before doing any
4929                  * more damage:
4930                  */
4931                 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
4932                 return 1;
4933         }
4934         vmcs12 = kmap(page);
4935         vmcs12->launch_state = 0;
4936         kunmap(page);
4937         nested_release_page(page);
4938
4939         nested_free_vmcs02(vmx, vmptr);
4940
4941         skip_emulated_instruction(vcpu);
4942         nested_vmx_succeed(vcpu);
4943         return 1;
4944 }
4945
4946 enum vmcs_field_type {
4947         VMCS_FIELD_TYPE_U16 = 0,
4948         VMCS_FIELD_TYPE_U64 = 1,
4949         VMCS_FIELD_TYPE_U32 = 2,
4950         VMCS_FIELD_TYPE_NATURAL_WIDTH = 3
4951 };
4952
4953 static inline int vmcs_field_type(unsigned long field)
4954 {
4955         if (0x1 & field)        /* the *_HIGH fields are all 32 bit */
4956                 return VMCS_FIELD_TYPE_U32;
4957         return (field >> 13) & 0x3 ;
4958 }
4959
4960 static inline int vmcs_field_readonly(unsigned long field)
4961 {
4962         return (((field >> 10) & 0x3) == 1);
4963 }
4964
4965 /*
4966  * Read a vmcs12 field. Since these can have varying lengths and we return
4967  * one type, we chose the biggest type (u64) and zero-extend the return value
4968  * to that size. Note that the caller, handle_vmread, might need to use only
4969  * some of the bits we return here (e.g., on 32-bit guests, only 32 bits of
4970  * 64-bit fields are to be returned).
4971  */
4972 static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu,
4973                                         unsigned long field, u64 *ret)
4974 {
4975         short offset = vmcs_field_to_offset(field);
4976         char *p;
4977
4978         if (offset < 0)
4979                 return 0;
4980
4981         p = ((char *)(get_vmcs12(vcpu))) + offset;
4982
4983         switch (vmcs_field_type(field)) {
4984         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
4985                 *ret = *((natural_width *)p);
4986                 return 1;
4987         case VMCS_FIELD_TYPE_U16:
4988                 *ret = *((u16 *)p);
4989                 return 1;
4990         case VMCS_FIELD_TYPE_U32:
4991                 *ret = *((u32 *)p);
4992                 return 1;
4993         case VMCS_FIELD_TYPE_U64:
4994                 *ret = *((u64 *)p);
4995                 return 1;
4996         default:
4997                 return 0; /* can never happen. */
4998         }
4999 }
5000
5001 /*
5002  * VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
5003  * used before) all generate the same failure when it is missing.
5004  */
5005 static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu)
5006 {
5007         struct vcpu_vmx *vmx = to_vmx(vcpu);
5008         if (vmx->nested.current_vmptr == -1ull) {
5009                 nested_vmx_failInvalid(vcpu);
5010                 skip_emulated_instruction(vcpu);
5011                 return 0;
5012         }
5013         return 1;
5014 }
5015
5016 static int handle_vmread(struct kvm_vcpu *vcpu)
5017 {
5018         unsigned long field;
5019         u64 field_value;
5020         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5021         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5022         gva_t gva = 0;
5023
5024         if (!nested_vmx_check_permission(vcpu) ||
5025             !nested_vmx_check_vmcs12(vcpu))
5026                 return 1;
5027
5028         /* Decode instruction info and find the field to read */
5029         field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
5030         /* Read the field, zero-extended to a u64 field_value */
5031         if (!vmcs12_read_any(vcpu, field, &field_value)) {
5032                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5033                 skip_emulated_instruction(vcpu);
5034                 return 1;
5035         }
5036         /*
5037          * Now copy part of this value to register or memory, as requested.
5038          * Note that the number of bits actually copied is 32 or 64 depending
5039          * on the guest's mode (32 or 64 bit), not on the given field's length.
5040          */
5041         if (vmx_instruction_info & (1u << 10)) {
5042                 kvm_register_write(vcpu, (((vmx_instruction_info) >> 3) & 0xf),
5043                         field_value);
5044         } else {
5045                 if (get_vmx_mem_address(vcpu, exit_qualification,
5046                                 vmx_instruction_info, &gva))
5047                         return 1;
5048                 /* _system ok, as nested_vmx_check_permission verified cpl=0 */
5049                 kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva,
5050                              &field_value, (is_long_mode(vcpu) ? 8 : 4), NULL);
5051         }
5052
5053         nested_vmx_succeed(vcpu);
5054         skip_emulated_instruction(vcpu);
5055         return 1;
5056 }
5057
5058
5059 static int handle_vmwrite(struct kvm_vcpu *vcpu)
5060 {
5061         unsigned long field;
5062         gva_t gva;
5063         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5064         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5065         char *p;
5066         short offset;
5067         /* The value to write might be 32 or 64 bits, depending on L1's long
5068          * mode, and eventually we need to write that into a field of several
5069          * possible lengths. The code below first zero-extends the value to 64
5070          * bit (field_value), and then copies only the approriate number of
5071          * bits into the vmcs12 field.
5072          */
5073         u64 field_value = 0;
5074         struct x86_exception e;
5075
5076         if (!nested_vmx_check_permission(vcpu) ||
5077             !nested_vmx_check_vmcs12(vcpu))
5078                 return 1;
5079
5080         if (vmx_instruction_info & (1u << 10))
5081                 field_value = kvm_register_read(vcpu,
5082                         (((vmx_instruction_info) >> 3) & 0xf));
5083         else {
5084                 if (get_vmx_mem_address(vcpu, exit_qualification,
5085                                 vmx_instruction_info, &gva))
5086                         return 1;
5087                 if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva,
5088                            &field_value, (is_long_mode(vcpu) ? 8 : 4), &e)) {
5089                         kvm_inject_page_fault(vcpu, &e);
5090                         return 1;
5091                 }
5092         }
5093
5094
5095         field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
5096         if (vmcs_field_readonly(field)) {
5097                 nested_vmx_failValid(vcpu,
5098                         VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
5099                 skip_emulated_instruction(vcpu);
5100                 return 1;
5101         }
5102
5103         offset = vmcs_field_to_offset(field);
5104         if (offset < 0) {
5105                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5106                 skip_emulated_instruction(vcpu);
5107                 return 1;
5108         }
5109         p = ((char *) get_vmcs12(vcpu)) + offset;
5110
5111         switch (vmcs_field_type(field)) {
5112         case VMCS_FIELD_TYPE_U16:
5113                 *(u16 *)p = field_value;
5114                 break;
5115         case VMCS_FIELD_TYPE_U32:
5116                 *(u32 *)p = field_value;
5117                 break;
5118         case VMCS_FIELD_TYPE_U64:
5119                 *(u64 *)p = field_value;
5120                 break;
5121         case VMCS_FIELD_TYPE_NATURAL_WIDTH:
5122                 *(natural_width *)p = field_value;
5123                 break;
5124         default:
5125                 nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
5126                 skip_emulated_instruction(vcpu);
5127                 return 1;
5128         }
5129
5130         nested_vmx_succeed(vcpu);
5131         skip_emulated_instruction(vcpu);
5132         return 1;
5133 }
5134
5135 /* Emulate the VMPTRLD instruction */
5136 static int handle_vmptrld(struct kvm_vcpu *vcpu)
5137 {
5138         struct vcpu_vmx *vmx = to_vmx(vcpu);
5139         gva_t gva;
5140         gpa_t vmptr;
5141         struct x86_exception e;
5142
5143         if (!nested_vmx_check_permission(vcpu))
5144                 return 1;
5145
5146         if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
5147                         vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
5148                 return 1;
5149
5150         if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
5151                                 sizeof(vmptr), &e)) {
5152                 kvm_inject_page_fault(vcpu, &e);
5153                 return 1;
5154         }
5155
5156         if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {
5157                 nested_vmx_failValid(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS);
5158                 skip_emulated_instruction(vcpu);
5159                 return 1;
5160         }
5161
5162         if (vmx->nested.current_vmptr != vmptr) {
5163                 struct vmcs12 *new_vmcs12;
5164                 struct page *page;
5165                 page = nested_get_page(vcpu, vmptr);
5166                 if (page == NULL) {
5167                         nested_vmx_failInvalid(vcpu);
5168                         skip_emulated_instruction(vcpu);
5169                         return 1;
5170                 }
5171                 new_vmcs12 = kmap(page);
5172                 if (new_vmcs12->revision_id != VMCS12_REVISION) {
5173                         kunmap(page);
5174                         nested_release_page_clean(page);
5175                         nested_vmx_failValid(vcpu,
5176                                 VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
5177                         skip_emulated_instruction(vcpu);
5178                         return 1;
5179                 }
5180                 if (vmx->nested.current_vmptr != -1ull) {
5181                         kunmap(vmx->nested.current_vmcs12_page);
5182                         nested_release_page(vmx->nested.current_vmcs12_page);
5183                 }
5184
5185                 vmx->nested.current_vmptr = vmptr;
5186                 vmx->nested.current_vmcs12 = new_vmcs12;
5187                 vmx->nested.current_vmcs12_page = page;
5188         }
5189
5190         nested_vmx_succeed(vcpu);
5191         skip_emulated_instruction(vcpu);
5192         return 1;
5193 }
5194
5195 /* Emulate the VMPTRST instruction */
5196 static int handle_vmptrst(struct kvm_vcpu *vcpu)
5197 {
5198         unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
5199         u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
5200         gva_t vmcs_gva;
5201         struct x86_exception e;
5202
5203         if (!nested_vmx_check_permission(vcpu))
5204                 return 1;
5205
5206         if (get_vmx_mem_address(vcpu, exit_qualification,
5207                         vmx_instruction_info, &vmcs_gva))
5208                 return 1;
5209         /* ok to use *_system, as nested_vmx_check_permission verified cpl=0 */
5210         if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva,
5211                                  (void *)&to_vmx(vcpu)->nested.current_vmptr,
5212                                  sizeof(u64), &e)) {
5213                 kvm_inject_page_fault(vcpu, &e);
5214                 return 1;
5215         }
5216         nested_vmx_succeed(vcpu);
5217         skip_emulated_instruction(vcpu);
5218         return 1;
5219 }
5220
5221 /*
5222  * The exit handlers return 1 if the exit was handled fully and guest execution
5223  * may resume.  Otherwise they set the kvm_run parameter to indicate what needs
5224  * to be done to userspace and return 0.
5225  */
5226 static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
5227         [EXIT_REASON_EXCEPTION_NMI]           = handle_exception,
5228         [EXIT_REASON_EXTERNAL_INTERRUPT]      = handle_external_interrupt,
5229         [EXIT_REASON_TRIPLE_FAULT]            = handle_triple_fault,
5230         [EXIT_REASON_NMI_WINDOW]              = handle_nmi_window,
5231         [EXIT_REASON_IO_INSTRUCTION]          = handle_io,
5232         [EXIT_REASON_CR_ACCESS]               = handle_cr,
5233         [EXIT_REASON_DR_ACCESS]               = handle_dr,
5234         [EXIT_REASON_CPUID]                   = handle_cpuid,
5235         [EXIT_REASON_MSR_READ]                = handle_rdmsr,
5236         [EXIT_REASON_MSR_WRITE]               = handle_wrmsr,
5237         [EXIT_REASON_PENDING_INTERRUPT]       = handle_interrupt_window,
5238         [EXIT_REASON_HLT]                     = handle_halt,
5239         [EXIT_REASON_INVD]                    = handle_invd,
5240         [EXIT_REASON_INVLPG]                  = handle_invlpg,
5241         [EXIT_REASON_VMCALL]                  = handle_vmcall,
5242         [EXIT_REASON_VMCLEAR]                 = handle_vmclear,
5243         [EXIT_REASON_VMLAUNCH]                = handle_vmx_insn,
5244         [EXIT_REASON_VMPTRLD]                 = handle_vmptrld,
5245         [EXIT_REASON_VMPTRST]                 = handle_vmptrst,
5246         [EXIT_REASON_VMREAD]                  = handle_vmread,
5247         [EXIT_REASON_VMRESUME]                = handle_vmx_insn,
5248         [EXIT_REASON_VMWRITE]                 = handle_vmwrite,
5249         [EXIT_REASON_VMOFF]                   = handle_vmoff,
5250         [EXIT_REASON_VMON]                    = handle_vmon,
5251         [EXIT_REASON_TPR_BELOW_THRESHOLD]     = handle_tpr_below_threshold,
5252         [EXIT_REASON_APIC_ACCESS]             = handle_apic_access,
5253         [EXIT_REASON_WBINVD]                  = handle_wbinvd,
5254         [EXIT_REASON_XSETBV]                  = handle_xsetbv,
5255         [EXIT_REASON_TASK_SWITCH]             = handle_task_switch,
5256         [EXIT_REASON_MCE_DURING_VMENTRY]      = handle_machine_check,
5257         [EXIT_REASON_EPT_VIOLATION]           = handle_ept_violation,
5258         [EXIT_REASON_EPT_MISCONFIG]           = handle_ept_misconfig,
5259         [EXIT_REASON_PAUSE_INSTRUCTION]       = handle_pause,
5260         [EXIT_REASON_MWAIT_INSTRUCTION]       = handle_invalid_op,
5261         [EXIT_REASON_MONITOR_INSTRUCTION]     = handle_invalid_op,
5262 };
5263
5264 static const int kvm_vmx_max_exit_handlers =
5265         ARRAY_SIZE(kvm_vmx_exit_handlers);
5266
5267 static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
5268 {
5269         *info1 = vmcs_readl(EXIT_QUALIFICATION);
5270         *info2 = vmcs_read32(VM_EXIT_INTR_INFO);
5271 }
5272
5273 /*
5274  * The guest has exited.  See if we can fix it or if we need userspace
5275  * assistance.
5276  */
5277 static int vmx_handle_exit(struct kvm_vcpu *vcpu)
5278 {
5279         struct vcpu_vmx *vmx = to_vmx(vcpu);
5280         u32 exit_reason = vmx->exit_reason;
5281         u32 vectoring_info = vmx->idt_vectoring_info;
5282
5283         trace_kvm_exit(exit_reason, vcpu, KVM_ISA_VMX);
5284
5285         /* If guest state is invalid, start emulating */
5286         if (vmx->emulation_required && emulate_invalid_guest_state)
5287                 return handle_invalid_guest_state(vcpu);
5288
5289         if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
5290                 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
5291                 vcpu->run->fail_entry.hardware_entry_failure_reason
5292                         = exit_reason;
5293                 return 0;
5294         }
5295
5296         if (unlikely(vmx->fail)) {
5297                 vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
5298                 vcpu->run->fail_entry.hardware_entry_failure_reason
5299                         = vmcs_read32(VM_INSTRUCTION_ERROR);
5300                 return 0;
5301         }
5302
5303         if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
5304                         (exit_reason != EXIT_REASON_EXCEPTION_NMI &&
5305                         exit_reason != EXIT_REASON_EPT_VIOLATION &&
5306                         exit_reason != EXIT_REASON_TASK_SWITCH))
5307                 printk(KERN_WARNING "%s: unexpected, valid vectoring info "
5308                        "(0x%x) and exit reason is 0x%x\n",
5309                        __func__, vectoring_info, exit_reason);
5310
5311         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked)) {
5312                 if (vmx_interrupt_allowed(vcpu)) {
5313                         vmx->soft_vnmi_blocked = 0;
5314                 } else if (vmx->vnmi_blocked_time > 1000000000LL &&
5315                            vcpu->arch.nmi_pending) {
5316                         /*
5317                          * This CPU don't support us in finding the end of an
5318                          * NMI-blocked window if the guest runs with IRQs
5319                          * disabled. So we pull the trigger after 1 s of
5320                          * futile waiting, but inform the user about this.
5321                          */
5322                         printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
5323                                "state on VCPU %d after 1 s timeout\n",
5324                                __func__, vcpu->vcpu_id);
5325                         vmx->soft_vnmi_blocked = 0;
5326                 }
5327         }
5328
5329         if (exit_reason < kvm_vmx_max_exit_handlers
5330             && kvm_vmx_exit_handlers[exit_reason])
5331                 return kvm_vmx_exit_handlers[exit_reason](vcpu);
5332         else {
5333                 vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
5334                 vcpu->run->hw.hardware_exit_reason = exit_reason;
5335         }
5336         return 0;
5337 }
5338
5339 static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
5340 {
5341         if (irr == -1 || tpr < irr) {
5342                 vmcs_write32(TPR_THRESHOLD, 0);
5343                 return;
5344         }
5345
5346         vmcs_write32(TPR_THRESHOLD, irr);
5347 }
5348
5349 static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
5350 {
5351         u32 exit_intr_info;
5352
5353         if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY
5354               || vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
5355                 return;
5356
5357         vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5358         exit_intr_info = vmx->exit_intr_info;
5359
5360         /* Handle machine checks before interrupts are enabled */
5361         if (is_machine_check(exit_intr_info))
5362                 kvm_machine_check();
5363
5364         /* We need to handle NMIs before interrupts are enabled */
5365         if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
5366             (exit_intr_info & INTR_INFO_VALID_MASK)) {
5367                 kvm_before_handle_nmi(&vmx->vcpu);
5368                 asm("int $2");
5369                 kvm_after_handle_nmi(&vmx->vcpu);
5370         }
5371 }
5372
5373 static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
5374 {
5375         u32 exit_intr_info;
5376         bool unblock_nmi;
5377         u8 vector;
5378         bool idtv_info_valid;
5379
5380         idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
5381
5382         if (cpu_has_virtual_nmis()) {
5383                 if (vmx->nmi_known_unmasked)
5384                         return;
5385                 /*
5386                  * Can't use vmx->exit_intr_info since we're not sure what
5387                  * the exit reason is.
5388                  */
5389                 exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
5390                 unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
5391                 vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
5392                 /*
5393                  * SDM 3: 27.7.1.2 (September 2008)
5394                  * Re-set bit "block by NMI" before VM entry if vmexit caused by
5395                  * a guest IRET fault.
5396                  * SDM 3: 23.2.2 (September 2008)
5397                  * Bit 12 is undefined in any of the following cases:
5398                  *  If the VM exit sets the valid bit in the IDT-vectoring
5399                  *   information field.
5400                  *  If the VM exit is due to a double fault.
5401                  */
5402                 if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
5403                     vector != DF_VECTOR && !idtv_info_valid)
5404                         vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
5405                                       GUEST_INTR_STATE_NMI);
5406                 else
5407                         vmx->nmi_known_unmasked =
5408                                 !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO)
5409                                   & GUEST_INTR_STATE_NMI);
5410         } else if (unlikely(vmx->soft_vnmi_blocked))
5411                 vmx->vnmi_blocked_time +=
5412                         ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
5413 }
5414
5415 static void __vmx_complete_interrupts(struct vcpu_vmx *vmx,
5416                                       u32 idt_vectoring_info,
5417                                       int instr_len_field,
5418                                       int error_code_field)
5419 {
5420         u8 vector;
5421         int type;
5422         bool idtv_info_valid;
5423
5424         idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
5425
5426         vmx->vcpu.arch.nmi_injected = false;
5427         kvm_clear_exception_queue(&vmx->vcpu);
5428         kvm_clear_interrupt_queue(&vmx->vcpu);
5429
5430         if (!idtv_info_valid)
5431                 return;
5432
5433         kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
5434
5435         vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
5436         type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
5437
5438         switch (type) {
5439         case INTR_TYPE_NMI_INTR:
5440                 vmx->vcpu.arch.nmi_injected = true;
5441                 /*
5442                  * SDM 3: 27.7.1.2 (September 2008)
5443                  * Clear bit "block by NMI" before VM entry if a NMI
5444                  * delivery faulted.
5445                  */
5446                 vmx_set_nmi_mask(&vmx->vcpu, false);
5447                 break;
5448         case INTR_TYPE_SOFT_EXCEPTION:
5449                 vmx->vcpu.arch.event_exit_inst_len =
5450                         vmcs_read32(instr_len_field);
5451                 /* fall through */
5452         case INTR_TYPE_HARD_EXCEPTION:
5453                 if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
5454                         u32 err = vmcs_read32(error_code_field);
5455                         kvm_queue_exception_e(&vmx->vcpu, vector, err);
5456                 } else
5457                         kvm_queue_exception(&vmx->vcpu, vector);
5458                 break;
5459         case INTR_TYPE_SOFT_INTR:
5460                 vmx->vcpu.arch.event_exit_inst_len =
5461                         vmcs_read32(instr_len_field);
5462                 /* fall through */
5463         case INTR_TYPE_EXT_INTR:
5464                 kvm_queue_interrupt(&vmx->vcpu, vector,
5465                         type == INTR_TYPE_SOFT_INTR);
5466                 break;
5467         default:
5468                 break;
5469         }
5470 }
5471
5472 static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
5473 {
5474         __vmx_complete_interrupts(vmx, vmx->idt_vectoring_info,
5475                                   VM_EXIT_INSTRUCTION_LEN,
5476                                   IDT_VECTORING_ERROR_CODE);
5477 }
5478
5479 static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
5480 {
5481         __vmx_complete_interrupts(to_vmx(vcpu),
5482                                   vmcs_read32(VM_ENTRY_INTR_INFO_FIELD),
5483                                   VM_ENTRY_INSTRUCTION_LEN,
5484                                   VM_ENTRY_EXCEPTION_ERROR_CODE);
5485
5486         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
5487 }
5488
5489 #ifdef CONFIG_X86_64
5490 #define R "r"
5491 #define Q "q"
5492 #else
5493 #define R "e"
5494 #define Q "l"
5495 #endif
5496
5497 static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
5498 {
5499         struct vcpu_vmx *vmx = to_vmx(vcpu);
5500
5501         /* Record the guest's net vcpu time for enforced NMI injections. */
5502         if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
5503                 vmx->entry_time = ktime_get();
5504
5505         /* Don't enter VMX if guest state is invalid, let the exit handler
5506            start emulation until we arrive back to a valid state */
5507         if (vmx->emulation_required && emulate_invalid_guest_state)
5508                 return;
5509
5510         if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
5511                 vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
5512         if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
5513                 vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
5514
5515         /* When single-stepping over STI and MOV SS, we must clear the
5516          * corresponding interruptibility bits in the guest state. Otherwise
5517          * vmentry fails as it then expects bit 14 (BS) in pending debug
5518          * exceptions being set, but that's not correct for the guest debugging
5519          * case. */
5520         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5521                 vmx_set_interrupt_shadow(vcpu, 0);
5522
5523         vmx->__launched = vmx->loaded_vmcs->launched;
5524         asm(
5525                 /* Store host registers */
5526                 "push %%"R"dx; push %%"R"bp;"
5527                 "push %%"R"cx \n\t" /* placeholder for guest rcx */
5528                 "push %%"R"cx \n\t"
5529                 "cmp %%"R"sp, %c[host_rsp](%0) \n\t"
5530                 "je 1f \n\t"
5531                 "mov %%"R"sp, %c[host_rsp](%0) \n\t"
5532                 __ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
5533                 "1: \n\t"
5534                 /* Reload cr2 if changed */
5535                 "mov %c[cr2](%0), %%"R"ax \n\t"
5536                 "mov %%cr2, %%"R"dx \n\t"
5537                 "cmp %%"R"ax, %%"R"dx \n\t"
5538                 "je 2f \n\t"
5539                 "mov %%"R"ax, %%cr2 \n\t"
5540                 "2: \n\t"
5541                 /* Check if vmlaunch of vmresume is needed */
5542                 "cmpl $0, %c[launched](%0) \n\t"
5543                 /* Load guest registers.  Don't clobber flags. */
5544                 "mov %c[rax](%0), %%"R"ax \n\t"
5545                 "mov %c[rbx](%0), %%"R"bx \n\t"
5546                 "mov %c[rdx](%0), %%"R"dx \n\t"
5547                 "mov %c[rsi](%0), %%"R"si \n\t"
5548                 "mov %c[rdi](%0), %%"R"di \n\t"
5549                 "mov %c[rbp](%0), %%"R"bp \n\t"
5550 #ifdef CONFIG_X86_64
5551                 "mov %c[r8](%0),  %%r8  \n\t"
5552                 "mov %c[r9](%0),  %%r9  \n\t"
5553                 "mov %c[r10](%0), %%r10 \n\t"
5554                 "mov %c[r11](%0), %%r11 \n\t"
5555                 "mov %c[r12](%0), %%r12 \n\t"
5556                 "mov %c[r13](%0), %%r13 \n\t"
5557                 "mov %c[r14](%0), %%r14 \n\t"
5558                 "mov %c[r15](%0), %%r15 \n\t"
5559 #endif
5560                 "mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
5561
5562                 /* Enter guest mode */
5563                 "jne .Llaunched \n\t"
5564                 __ex(ASM_VMX_VMLAUNCH) "\n\t"
5565                 "jmp .Lkvm_vmx_return \n\t"
5566                 ".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
5567                 ".Lkvm_vmx_return: "
5568                 /* Save guest registers, load host registers, keep flags */
5569                 "mov %0, %c[wordsize](%%"R"sp) \n\t"
5570                 "pop %0 \n\t"
5571                 "mov %%"R"ax, %c[rax](%0) \n\t"
5572                 "mov %%"R"bx, %c[rbx](%0) \n\t"
5573                 "pop"Q" %c[rcx](%0) \n\t"
5574                 "mov %%"R"dx, %c[rdx](%0) \n\t"
5575                 "mov %%"R"si, %c[rsi](%0) \n\t"
5576                 "mov %%"R"di, %c[rdi](%0) \n\t"
5577                 "mov %%"R"bp, %c[rbp](%0) \n\t"
5578 #ifdef CONFIG_X86_64
5579                 "mov %%r8,  %c[r8](%0) \n\t"
5580                 "mov %%r9,  %c[r9](%0) \n\t"
5581                 "mov %%r10, %c[r10](%0) \n\t"
5582                 "mov %%r11, %c[r11](%0) \n\t"
5583                 "mov %%r12, %c[r12](%0) \n\t"
5584                 "mov %%r13, %c[r13](%0) \n\t"
5585                 "mov %%r14, %c[r14](%0) \n\t"
5586                 "mov %%r15, %c[r15](%0) \n\t"
5587 #endif
5588                 "mov %%cr2, %%"R"ax   \n\t"
5589                 "mov %%"R"ax, %c[cr2](%0) \n\t"
5590
5591                 "pop  %%"R"bp; pop  %%"R"dx \n\t"
5592                 "setbe %c[fail](%0) \n\t"
5593               : : "c"(vmx), "d"((unsigned long)HOST_RSP),
5594                 [launched]"i"(offsetof(struct vcpu_vmx, __launched)),
5595                 [fail]"i"(offsetof(struct vcpu_vmx, fail)),
5596                 [host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
5597                 [rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
5598                 [rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
5599                 [rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
5600                 [rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
5601                 [rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
5602                 [rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
5603                 [rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
5604 #ifdef CONFIG_X86_64
5605                 [r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
5606                 [r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
5607                 [r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
5608                 [r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
5609                 [r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
5610                 [r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
5611                 [r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
5612                 [r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
5613 #endif
5614                 [cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)),
5615                 [wordsize]"i"(sizeof(ulong))
5616               : "cc", "memory"
5617                 , R"ax", R"bx", R"di", R"si"
5618 #ifdef CONFIG_X86_64
5619                 , "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
5620 #endif
5621               );
5622
5623         vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
5624                                   | (1 << VCPU_EXREG_RFLAGS)
5625                                   | (1 << VCPU_EXREG_CPL)
5626                                   | (1 << VCPU_EXREG_PDPTR)
5627                                   | (1 << VCPU_EXREG_SEGMENTS)
5628                                   | (1 << VCPU_EXREG_CR3));
5629         vcpu->arch.regs_dirty = 0;
5630
5631         vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
5632
5633         asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
5634         vmx->loaded_vmcs->launched = 1;
5635
5636         vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
5637
5638         vmx_complete_atomic_exit(vmx);
5639         vmx_recover_nmi_blocking(vmx);
5640         vmx_complete_interrupts(vmx);
5641 }
5642
5643 #undef R
5644 #undef Q
5645
5646 static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
5647 {
5648         struct vcpu_vmx *vmx = to_vmx(vcpu);
5649
5650         free_vpid(vmx);
5651         free_nested(vmx);
5652         free_loaded_vmcs(vmx->loaded_vmcs);
5653         kfree(vmx->guest_msrs);
5654         kvm_vcpu_uninit(vcpu);
5655         kmem_cache_free(kvm_vcpu_cache, vmx);
5656 }
5657
5658 static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
5659 {
5660         int err;
5661         struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
5662         int cpu;
5663
5664         if (!vmx)
5665                 return ERR_PTR(-ENOMEM);
5666
5667         allocate_vpid(vmx);
5668
5669         err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
5670         if (err)
5671                 goto free_vcpu;
5672
5673         vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
5674         err = -ENOMEM;
5675         if (!vmx->guest_msrs) {
5676                 goto uninit_vcpu;
5677         }
5678
5679         vmx->loaded_vmcs = &vmx->vmcs01;
5680         vmx->loaded_vmcs->vmcs = alloc_vmcs();
5681         if (!vmx->loaded_vmcs->vmcs)
5682                 goto free_msrs;
5683         if (!vmm_exclusive)
5684                 kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id())));
5685         loaded_vmcs_init(vmx->loaded_vmcs);
5686         if (!vmm_exclusive)
5687                 kvm_cpu_vmxoff();
5688
5689         cpu = get_cpu();
5690         vmx_vcpu_load(&vmx->vcpu, cpu);
5691         vmx->vcpu.cpu = cpu;
5692         err = vmx_vcpu_setup(vmx);
5693         vmx_vcpu_put(&vmx->vcpu);
5694         put_cpu();
5695         if (err)
5696                 goto free_vmcs;
5697         if (vm_need_virtualize_apic_accesses(kvm))
5698                 err = alloc_apic_access_page(kvm);
5699                 if (err)
5700                         goto free_vmcs;
5701
5702         if (enable_ept) {
5703                 if (!kvm->arch.ept_identity_map_addr)
5704                         kvm->arch.ept_identity_map_addr =
5705                                 VMX_EPT_IDENTITY_PAGETABLE_ADDR;
5706                 err = -ENOMEM;
5707                 if (alloc_identity_pagetable(kvm) != 0)
5708                         goto free_vmcs;
5709                 if (!init_rmode_identity_map(kvm))
5710                         goto free_vmcs;
5711         }
5712
5713         vmx->nested.current_vmptr = -1ull;
5714         vmx->nested.current_vmcs12 = NULL;
5715
5716         return &vmx->vcpu;
5717
5718 free_vmcs:
5719         free_vmcs(vmx->loaded_vmcs->vmcs);
5720 free_msrs:
5721         kfree(vmx->guest_msrs);
5722 uninit_vcpu:
5723         kvm_vcpu_uninit(&vmx->vcpu);
5724 free_vcpu:
5725         free_vpid(vmx);
5726         kmem_cache_free(kvm_vcpu_cache, vmx);
5727         return ERR_PTR(err);
5728 }
5729
5730 static void __init vmx_check_processor_compat(void *rtn)
5731 {
5732         struct vmcs_config vmcs_conf;
5733
5734         *(int *)rtn = 0;
5735         if (setup_vmcs_config(&vmcs_conf) < 0)
5736                 *(int *)rtn = -EIO;
5737         if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
5738                 printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
5739                                 smp_processor_id());
5740                 *(int *)rtn = -EIO;
5741         }
5742 }
5743
5744 static int get_ept_level(void)
5745 {
5746         return VMX_EPT_DEFAULT_GAW + 1;
5747 }
5748
5749 static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
5750 {
5751         u64 ret;
5752
5753         /* For VT-d and EPT combination
5754          * 1. MMIO: always map as UC
5755          * 2. EPT with VT-d:
5756          *   a. VT-d without snooping control feature: can't guarantee the
5757          *      result, try to trust guest.
5758          *   b. VT-d with snooping control feature: snooping control feature of
5759          *      VT-d engine can guarantee the cache correctness. Just set it
5760          *      to WB to keep consistent with host. So the same as item 3.
5761          * 3. EPT without VT-d: always map as WB and set IPAT=1 to keep
5762          *    consistent with host MTRR
5763          */
5764         if (is_mmio)
5765                 ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
5766         else if (vcpu->kvm->arch.iommu_domain &&
5767                 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY))
5768                 ret = kvm_get_guest_memory_type(vcpu, gfn) <<
5769                       VMX_EPT_MT_EPTE_SHIFT;
5770         else
5771                 ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
5772                         | VMX_EPT_IPAT_BIT;
5773
5774         return ret;
5775 }
5776
5777 #define _ER(x) { EXIT_REASON_##x, #x }
5778
5779 static const struct trace_print_flags vmx_exit_reasons_str[] = {
5780         _ER(EXCEPTION_NMI),
5781         _ER(EXTERNAL_INTERRUPT),
5782         _ER(TRIPLE_FAULT),
5783         _ER(PENDING_INTERRUPT),
5784         _ER(NMI_WINDOW),
5785         _ER(TASK_SWITCH),
5786         _ER(CPUID),
5787         _ER(HLT),
5788         _ER(INVLPG),
5789         _ER(RDPMC),
5790         _ER(RDTSC),
5791         _ER(VMCALL),
5792         _ER(VMCLEAR),
5793         _ER(VMLAUNCH),
5794         _ER(VMPTRLD),
5795         _ER(VMPTRST),
5796         _ER(VMREAD),
5797         _ER(VMRESUME),
5798         _ER(VMWRITE),
5799         _ER(VMOFF),
5800         _ER(VMON),
5801         _ER(CR_ACCESS),
5802         _ER(DR_ACCESS),
5803         _ER(IO_INSTRUCTION),
5804         _ER(MSR_READ),
5805         _ER(MSR_WRITE),
5806         _ER(MWAIT_INSTRUCTION),
5807         _ER(MONITOR_INSTRUCTION),
5808         _ER(PAUSE_INSTRUCTION),
5809         _ER(MCE_DURING_VMENTRY),
5810         _ER(TPR_BELOW_THRESHOLD),
5811         _ER(APIC_ACCESS),
5812         _ER(EPT_VIOLATION),
5813         _ER(EPT_MISCONFIG),
5814         _ER(WBINVD),
5815         { -1, NULL }
5816 };
5817
5818 #undef _ER
5819
5820 static int vmx_get_lpage_level(void)
5821 {
5822         if (enable_ept && !cpu_has_vmx_ept_1g_page())
5823                 return PT_DIRECTORY_LEVEL;
5824         else
5825                 /* For shadow and EPT supported 1GB page */
5826                 return PT_PDPE_LEVEL;
5827 }
5828
5829 static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
5830 {
5831         struct kvm_cpuid_entry2 *best;
5832         struct vcpu_vmx *vmx = to_vmx(vcpu);
5833         u32 exec_control;
5834
5835         vmx->rdtscp_enabled = false;
5836         if (vmx_rdtscp_supported()) {
5837                 exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
5838                 if (exec_control & SECONDARY_EXEC_RDTSCP) {
5839                         best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
5840                         if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
5841                                 vmx->rdtscp_enabled = true;
5842                         else {
5843                                 exec_control &= ~SECONDARY_EXEC_RDTSCP;
5844                                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
5845                                                 exec_control);
5846                         }
5847                 }
5848         }
5849 }
5850
5851 static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
5852 {
5853 }
5854
5855 /*
5856  * prepare_vmcs02 is called when the L1 guest hypervisor runs its nested
5857  * L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it
5858  * with L0's requirements for its guest (a.k.a. vmsc01), so we can run the L2
5859  * guest in a way that will both be appropriate to L1's requests, and our
5860  * needs. In addition to modifying the active vmcs (which is vmcs02), this
5861  * function also has additional necessary side-effects, like setting various
5862  * vcpu->arch fields.
5863  */
5864 static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
5865 {
5866         struct vcpu_vmx *vmx = to_vmx(vcpu);
5867         u32 exec_control;
5868
5869         vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector);
5870         vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector);
5871         vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector);
5872         vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector);
5873         vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector);
5874         vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector);
5875         vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector);
5876         vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector);
5877         vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit);
5878         vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit);
5879         vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit);
5880         vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit);
5881         vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit);
5882         vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit);
5883         vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit);
5884         vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit);
5885         vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit);
5886         vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit);
5887         vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes);
5888         vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes);
5889         vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes);
5890         vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes);
5891         vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes);
5892         vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes);
5893         vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes);
5894         vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes);
5895         vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base);
5896         vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base);
5897         vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base);
5898         vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base);
5899         vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base);
5900         vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base);
5901         vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base);
5902         vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base);
5903         vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
5904         vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
5905
5906         vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
5907         vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
5908                 vmcs12->vm_entry_intr_info_field);
5909         vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
5910                 vmcs12->vm_entry_exception_error_code);
5911         vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
5912                 vmcs12->vm_entry_instruction_len);
5913         vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
5914                 vmcs12->guest_interruptibility_info);
5915         vmcs_write32(GUEST_ACTIVITY_STATE, vmcs12->guest_activity_state);
5916         vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
5917         vmcs_writel(GUEST_DR7, vmcs12->guest_dr7);
5918         vmcs_writel(GUEST_RFLAGS, vmcs12->guest_rflags);
5919         vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
5920                 vmcs12->guest_pending_dbg_exceptions);
5921         vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp);
5922         vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip);
5923
5924         vmcs_write64(VMCS_LINK_POINTER, -1ull);
5925
5926         vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
5927                 (vmcs_config.pin_based_exec_ctrl |
5928                  vmcs12->pin_based_vm_exec_control));
5929
5930         /*
5931          * Whether page-faults are trapped is determined by a combination of
5932          * 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF.
5933          * If enable_ept, L0 doesn't care about page faults and we should
5934          * set all of these to L1's desires. However, if !enable_ept, L0 does
5935          * care about (at least some) page faults, and because it is not easy
5936          * (if at all possible?) to merge L0 and L1's desires, we simply ask
5937          * to exit on each and every L2 page fault. This is done by setting
5938          * MASK=MATCH=0 and (see below) EB.PF=1.
5939          * Note that below we don't need special code to set EB.PF beyond the
5940          * "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept,
5941          * vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when
5942          * !enable_ept, EB.PF is 1, so the "or" will always be 1.
5943          *
5944          * A problem with this approach (when !enable_ept) is that L1 may be
5945          * injected with more page faults than it asked for. This could have
5946          * caused problems, but in practice existing hypervisors don't care.
5947          * To fix this, we will need to emulate the PFEC checking (on the L1
5948          * page tables), using walk_addr(), when injecting PFs to L1.
5949          */
5950         vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
5951                 enable_ept ? vmcs12->page_fault_error_code_mask : 0);
5952         vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
5953                 enable_ept ? vmcs12->page_fault_error_code_match : 0);
5954
5955         if (cpu_has_secondary_exec_ctrls()) {
5956                 u32 exec_control = vmx_secondary_exec_control(vmx);
5957                 if (!vmx->rdtscp_enabled)
5958                         exec_control &= ~SECONDARY_EXEC_RDTSCP;
5959                 /* Take the following fields only from vmcs12 */
5960                 exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
5961                 if (nested_cpu_has(vmcs12,
5962                                 CPU_BASED_ACTIVATE_SECONDARY_CONTROLS))
5963                         exec_control |= vmcs12->secondary_vm_exec_control;
5964
5965                 if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) {
5966                         /*
5967                          * Translate L1 physical address to host physical
5968                          * address for vmcs02. Keep the page pinned, so this
5969                          * physical address remains valid. We keep a reference
5970                          * to it so we can release it later.
5971                          */
5972                         if (vmx->nested.apic_access_page) /* shouldn't happen */
5973                                 nested_release_page(vmx->nested.apic_access_page);
5974                         vmx->nested.apic_access_page =
5975                                 nested_get_page(vcpu, vmcs12->apic_access_addr);
5976                         /*
5977                          * If translation failed, no matter: This feature asks
5978                          * to exit when accessing the given address, and if it
5979                          * can never be accessed, this feature won't do
5980                          * anything anyway.
5981                          */
5982                         if (!vmx->nested.apic_access_page)
5983                                 exec_control &=
5984                                   ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
5985                         else
5986                                 vmcs_write64(APIC_ACCESS_ADDR,
5987                                   page_to_phys(vmx->nested.apic_access_page));
5988                 }
5989
5990                 vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
5991         }
5992
5993
5994         /*
5995          * Set host-state according to L0's settings (vmcs12 is irrelevant here)
5996          * Some constant fields are set here by vmx_set_constant_host_state().
5997          * Other fields are different per CPU, and will be set later when
5998          * vmx_vcpu_load() is called, and when vmx_save_host_state() is called.
5999          */
6000         vmx_set_constant_host_state();
6001
6002         /*
6003          * HOST_RSP is normally set correctly in vmx_vcpu_run() just before
6004          * entry, but only if the current (host) sp changed from the value
6005          * we wrote last (vmx->host_rsp). This cache is no longer relevant
6006          * if we switch vmcs, and rather than hold a separate cache per vmcs,
6007          * here we just force the write to happen on entry.
6008          */
6009         vmx->host_rsp = 0;
6010
6011         exec_control = vmx_exec_control(vmx); /* L0's desires */
6012         exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
6013         exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
6014         exec_control &= ~CPU_BASED_TPR_SHADOW;
6015         exec_control |= vmcs12->cpu_based_vm_exec_control;
6016         /*
6017          * Merging of IO and MSR bitmaps not currently supported.
6018          * Rather, exit every time.
6019          */
6020         exec_control &= ~CPU_BASED_USE_MSR_BITMAPS;
6021         exec_control &= ~CPU_BASED_USE_IO_BITMAPS;
6022         exec_control |= CPU_BASED_UNCOND_IO_EXITING;
6023
6024         vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
6025
6026         /* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the
6027          * bitwise-or of what L1 wants to trap for L2, and what we want to
6028          * trap. Note that CR0.TS also needs updating - we do this later.
6029          */
6030         update_exception_bitmap(vcpu);
6031         vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask;
6032         vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
6033
6034         /* Note: IA32_MODE, LOAD_IA32_EFER are modified by vmx_set_efer below */
6035         vmcs_write32(VM_EXIT_CONTROLS,
6036                 vmcs12->vm_exit_controls | vmcs_config.vmexit_ctrl);
6037         vmcs_write32(VM_ENTRY_CONTROLS, vmcs12->vm_entry_controls |
6038                 (vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE));
6039
6040         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)
6041                 vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat);
6042         else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
6043                 vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
6044
6045
6046         set_cr4_guest_host_mask(vmx);
6047
6048         vmcs_write64(TSC_OFFSET,
6049                 vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset);
6050
6051         if (enable_vpid) {
6052                 /*
6053                  * Trivially support vpid by letting L2s share their parent
6054                  * L1's vpid. TODO: move to a more elaborate solution, giving
6055                  * each L2 its own vpid and exposing the vpid feature to L1.
6056                  */
6057                 vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
6058                 vmx_flush_tlb(vcpu);
6059         }
6060
6061         if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)
6062                 vcpu->arch.efer = vmcs12->guest_ia32_efer;
6063         if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE)
6064                 vcpu->arch.efer |= (EFER_LMA | EFER_LME);
6065         else
6066                 vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
6067         /* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */
6068         vmx_set_efer(vcpu, vcpu->arch.efer);
6069
6070         /*
6071          * This sets GUEST_CR0 to vmcs12->guest_cr0, with possibly a modified
6072          * TS bit (for lazy fpu) and bits which we consider mandatory enabled.
6073          * The CR0_READ_SHADOW is what L2 should have expected to read given
6074          * the specifications by L1; It's not enough to take
6075          * vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we
6076          * have more bits than L1 expected.
6077          */
6078         vmx_set_cr0(vcpu, vmcs12->guest_cr0);
6079         vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
6080
6081         vmx_set_cr4(vcpu, vmcs12->guest_cr4);
6082         vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12));
6083
6084         /* shadow page tables on either EPT or shadow page tables */
6085         kvm_set_cr3(vcpu, vmcs12->guest_cr3);
6086         kvm_mmu_reset_context(vcpu);
6087
6088         kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
6089         kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip);
6090 }
6091
6092 static int vmx_check_intercept(struct kvm_vcpu *vcpu,
6093                                struct x86_instruction_info *info,
6094                                enum x86_intercept_stage stage)
6095 {
6096         return X86EMUL_CONTINUE;
6097 }
6098
6099 static struct kvm_x86_ops vmx_x86_ops = {
6100         .cpu_has_kvm_support = cpu_has_kvm_support,
6101         .disabled_by_bios = vmx_disabled_by_bios,
6102         .hardware_setup = hardware_setup,
6103         .hardware_unsetup = hardware_unsetup,
6104         .check_processor_compatibility = vmx_check_processor_compat,
6105         .hardware_enable = hardware_enable,
6106         .hardware_disable = hardware_disable,
6107         .cpu_has_accelerated_tpr = report_flexpriority,
6108
6109         .vcpu_create = vmx_create_vcpu,
6110         .vcpu_free = vmx_free_vcpu,
6111         .vcpu_reset = vmx_vcpu_reset,
6112
6113         .prepare_guest_switch = vmx_save_host_state,
6114         .vcpu_load = vmx_vcpu_load,
6115         .vcpu_put = vmx_vcpu_put,
6116
6117         .set_guest_debug = set_guest_debug,
6118         .get_msr = vmx_get_msr,
6119         .set_msr = vmx_set_msr,
6120         .get_segment_base = vmx_get_segment_base,
6121         .get_segment = vmx_get_segment,
6122         .set_segment = vmx_set_segment,
6123         .get_cpl = vmx_get_cpl,
6124         .get_cs_db_l_bits = vmx_get_cs_db_l_bits,
6125         .decache_cr0_guest_bits = vmx_decache_cr0_guest_bits,
6126         .decache_cr3 = vmx_decache_cr3,
6127         .decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
6128         .set_cr0 = vmx_set_cr0,
6129         .set_cr3 = vmx_set_cr3,
6130         .set_cr4 = vmx_set_cr4,
6131         .set_efer = vmx_set_efer,
6132         .get_idt = vmx_get_idt,
6133         .set_idt = vmx_set_idt,
6134         .get_gdt = vmx_get_gdt,
6135         .set_gdt = vmx_set_gdt,
6136         .set_dr7 = vmx_set_dr7,
6137         .cache_reg = vmx_cache_reg,
6138         .get_rflags = vmx_get_rflags,
6139         .set_rflags = vmx_set_rflags,
6140         .fpu_activate = vmx_fpu_activate,
6141         .fpu_deactivate = vmx_fpu_deactivate,
6142
6143         .tlb_flush = vmx_flush_tlb,
6144
6145         .run = vmx_vcpu_run,
6146         .handle_exit = vmx_handle_exit,
6147         .skip_emulated_instruction = skip_emulated_instruction,
6148         .set_interrupt_shadow = vmx_set_interrupt_shadow,
6149         .get_interrupt_shadow = vmx_get_interrupt_shadow,
6150         .patch_hypercall = vmx_patch_hypercall,
6151         .set_irq = vmx_inject_irq,
6152         .set_nmi = vmx_inject_nmi,
6153         .queue_exception = vmx_queue_exception,
6154         .cancel_injection = vmx_cancel_injection,
6155         .interrupt_allowed = vmx_interrupt_allowed,
6156         .nmi_allowed = vmx_nmi_allowed,
6157         .get_nmi_mask = vmx_get_nmi_mask,
6158         .set_nmi_mask = vmx_set_nmi_mask,
6159         .enable_nmi_window = enable_nmi_window,
6160         .enable_irq_window = enable_irq_window,
6161         .update_cr8_intercept = update_cr8_intercept,
6162
6163         .set_tss_addr = vmx_set_tss_addr,
6164         .get_tdp_level = get_ept_level,
6165         .get_mt_mask = vmx_get_mt_mask,
6166
6167         .get_exit_info = vmx_get_exit_info,
6168         .exit_reasons_str = vmx_exit_reasons_str,
6169
6170         .get_lpage_level = vmx_get_lpage_level,
6171
6172         .cpuid_update = vmx_cpuid_update,
6173
6174         .rdtscp_supported = vmx_rdtscp_supported,
6175
6176         .set_supported_cpuid = vmx_set_supported_cpuid,
6177
6178         .has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
6179
6180         .set_tsc_khz = vmx_set_tsc_khz,
6181         .write_tsc_offset = vmx_write_tsc_offset,
6182         .adjust_tsc_offset = vmx_adjust_tsc_offset,
6183         .compute_tsc_offset = vmx_compute_tsc_offset,
6184
6185         .set_tdp_cr3 = vmx_set_cr3,
6186
6187         .check_intercept = vmx_check_intercept,
6188 };
6189
6190 static int __init vmx_init(void)
6191 {
6192         int r, i;
6193
6194         rdmsrl_safe(MSR_EFER, &host_efer);
6195
6196         for (i = 0; i < NR_VMX_MSR; ++i)
6197                 kvm_define_shared_msr(i, vmx_msr_index[i]);
6198
6199         vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
6200         if (!vmx_io_bitmap_a)
6201                 return -ENOMEM;
6202
6203         vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
6204         if (!vmx_io_bitmap_b) {
6205                 r = -ENOMEM;
6206                 goto out;
6207         }
6208
6209         vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
6210         if (!vmx_msr_bitmap_legacy) {
6211                 r = -ENOMEM;
6212                 goto out1;
6213         }
6214
6215         vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
6216         if (!vmx_msr_bitmap_longmode) {
6217                 r = -ENOMEM;
6218                 goto out2;
6219         }
6220
6221         /*
6222          * Allow direct access to the PC debug port (it is often used for I/O
6223          * delays, but the vmexits simply slow things down).
6224          */
6225         memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
6226         clear_bit(0x80, vmx_io_bitmap_a);
6227
6228         memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
6229
6230         memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
6231         memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
6232
6233         set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
6234
6235         r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
6236                      __alignof__(struct vcpu_vmx), THIS_MODULE);
6237         if (r)
6238                 goto out3;
6239
6240         vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
6241         vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
6242         vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
6243         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
6244         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
6245         vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
6246
6247         if (enable_ept) {
6248                 bypass_guest_pf = 0;
6249                 kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
6250                                 VMX_EPT_EXECUTABLE_MASK);
6251                 kvm_enable_tdp();
6252         } else
6253                 kvm_disable_tdp();
6254
6255         if (bypass_guest_pf)
6256                 kvm_mmu_set_nonpresent_ptes(~0xffeull, 0ull);
6257
6258         return 0;
6259
6260 out3:
6261         free_page((unsigned long)vmx_msr_bitmap_longmode);
6262 out2:
6263         free_page((unsigned long)vmx_msr_bitmap_legacy);
6264 out1:
6265         free_page((unsigned long)vmx_io_bitmap_b);
6266 out:
6267         free_page((unsigned long)vmx_io_bitmap_a);
6268         return r;
6269 }
6270
6271 static void __exit vmx_exit(void)
6272 {
6273         free_page((unsigned long)vmx_msr_bitmap_legacy);
6274         free_page((unsigned long)vmx_msr_bitmap_longmode);
6275         free_page((unsigned long)vmx_io_bitmap_b);
6276         free_page((unsigned long)vmx_io_bitmap_a);
6277
6278         kvm_exit();
6279 }
6280
6281 module_init(vmx_init)
6282 module_exit(vmx_exit)