c0ae5e6cba9b6b4fe1d9a14dd0fa05428c29c7e1
[linux-2.6.git] / arch / x86 / kvm / x86.c
1 /*
2  * Kernel-based Virtual Machine driver for Linux
3  *
4  * derived from drivers/kvm/kvm_main.c
5  *
6  * Copyright (C) 2006 Qumranet, Inc.
7  * Copyright (C) 2008 Qumranet, Inc.
8  * Copyright IBM Corporation, 2008
9  *
10  * Authors:
11  *   Avi Kivity   <avi@qumranet.com>
12  *   Yaniv Kamay  <yaniv@qumranet.com>
13  *   Amit Shah    <amit.shah@qumranet.com>
14  *   Ben-Ami Yassour <benami@il.ibm.com>
15  *
16  * This work is licensed under the terms of the GNU GPL, version 2.  See
17  * the COPYING file in the top-level directory.
18  *
19  */
20
21 #include <linux/kvm_host.h>
22 #include "irq.h"
23 #include "mmu.h"
24 #include "i8254.h"
25 #include "tss.h"
26 #include "kvm_cache_regs.h"
27 #include "x86.h"
28
29 #include <linux/clocksource.h>
30 #include <linux/interrupt.h>
31 #include <linux/kvm.h>
32 #include <linux/fs.h>
33 #include <linux/vmalloc.h>
34 #include <linux/module.h>
35 #include <linux/mman.h>
36 #include <linux/highmem.h>
37 #include <linux/iommu.h>
38 #include <linux/intel-iommu.h>
39 #include <linux/cpufreq.h>
40
41 #include <asm/uaccess.h>
42 #include <asm/msr.h>
43 #include <asm/desc.h>
44 #include <asm/mtrr.h>
45
46 #define MAX_IO_MSRS 256
47 #define CR0_RESERVED_BITS                                               \
48         (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
49                           | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
50                           | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
51 #define CR4_RESERVED_BITS                                               \
52         (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
53                           | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE     \
54                           | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR  \
55                           | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
56
57 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
58 /* EFER defaults:
59  * - enable syscall per default because its emulated by KVM
60  * - enable LME and LMA per default on 64 bit KVM
61  */
62 #ifdef CONFIG_X86_64
63 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
64 #else
65 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
66 #endif
67
68 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
69 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
70
71 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
72                                     struct kvm_cpuid_entry2 __user *entries);
73 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
74                                               u32 function, u32 index);
75
76 struct kvm_x86_ops *kvm_x86_ops;
77 EXPORT_SYMBOL_GPL(kvm_x86_ops);
78
79 struct kvm_stats_debugfs_item debugfs_entries[] = {
80         { "pf_fixed", VCPU_STAT(pf_fixed) },
81         { "pf_guest", VCPU_STAT(pf_guest) },
82         { "tlb_flush", VCPU_STAT(tlb_flush) },
83         { "invlpg", VCPU_STAT(invlpg) },
84         { "exits", VCPU_STAT(exits) },
85         { "io_exits", VCPU_STAT(io_exits) },
86         { "mmio_exits", VCPU_STAT(mmio_exits) },
87         { "signal_exits", VCPU_STAT(signal_exits) },
88         { "irq_window", VCPU_STAT(irq_window_exits) },
89         { "nmi_window", VCPU_STAT(nmi_window_exits) },
90         { "halt_exits", VCPU_STAT(halt_exits) },
91         { "halt_wakeup", VCPU_STAT(halt_wakeup) },
92         { "hypercalls", VCPU_STAT(hypercalls) },
93         { "request_irq", VCPU_STAT(request_irq_exits) },
94         { "request_nmi", VCPU_STAT(request_nmi_exits) },
95         { "irq_exits", VCPU_STAT(irq_exits) },
96         { "host_state_reload", VCPU_STAT(host_state_reload) },
97         { "efer_reload", VCPU_STAT(efer_reload) },
98         { "fpu_reload", VCPU_STAT(fpu_reload) },
99         { "insn_emulation", VCPU_STAT(insn_emulation) },
100         { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
101         { "irq_injections", VCPU_STAT(irq_injections) },
102         { "nmi_injections", VCPU_STAT(nmi_injections) },
103         { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
104         { "mmu_pte_write", VM_STAT(mmu_pte_write) },
105         { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
106         { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
107         { "mmu_flooded", VM_STAT(mmu_flooded) },
108         { "mmu_recycled", VM_STAT(mmu_recycled) },
109         { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
110         { "mmu_unsync", VM_STAT(mmu_unsync) },
111         { "mmu_unsync_global", VM_STAT(mmu_unsync_global) },
112         { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
113         { "largepages", VM_STAT(lpages) },
114         { NULL }
115 };
116
117 unsigned long segment_base(u16 selector)
118 {
119         struct descriptor_table gdt;
120         struct desc_struct *d;
121         unsigned long table_base;
122         unsigned long v;
123
124         if (selector == 0)
125                 return 0;
126
127         asm("sgdt %0" : "=m"(gdt));
128         table_base = gdt.base;
129
130         if (selector & 4) {           /* from ldt */
131                 u16 ldt_selector;
132
133                 asm("sldt %0" : "=g"(ldt_selector));
134                 table_base = segment_base(ldt_selector);
135         }
136         d = (struct desc_struct *)(table_base + (selector & ~7));
137         v = d->base0 | ((unsigned long)d->base1 << 16) |
138                 ((unsigned long)d->base2 << 24);
139 #ifdef CONFIG_X86_64
140         if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
141                 v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
142 #endif
143         return v;
144 }
145 EXPORT_SYMBOL_GPL(segment_base);
146
147 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
148 {
149         if (irqchip_in_kernel(vcpu->kvm))
150                 return vcpu->arch.apic_base;
151         else
152                 return vcpu->arch.apic_base;
153 }
154 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
155
156 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
157 {
158         /* TODO: reserve bits check */
159         if (irqchip_in_kernel(vcpu->kvm))
160                 kvm_lapic_set_base(vcpu, data);
161         else
162                 vcpu->arch.apic_base = data;
163 }
164 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
165
166 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
167 {
168         WARN_ON(vcpu->arch.exception.pending);
169         vcpu->arch.exception.pending = true;
170         vcpu->arch.exception.has_error_code = false;
171         vcpu->arch.exception.nr = nr;
172 }
173 EXPORT_SYMBOL_GPL(kvm_queue_exception);
174
175 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, unsigned long addr,
176                            u32 error_code)
177 {
178         ++vcpu->stat.pf_guest;
179
180         if (vcpu->arch.exception.pending) {
181                 if (vcpu->arch.exception.nr == PF_VECTOR) {
182                         printk(KERN_DEBUG "kvm: inject_page_fault:"
183                                         " double fault 0x%lx\n", addr);
184                         vcpu->arch.exception.nr = DF_VECTOR;
185                         vcpu->arch.exception.error_code = 0;
186                 } else if (vcpu->arch.exception.nr == DF_VECTOR) {
187                         /* triple fault -> shutdown */
188                         set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
189                 }
190                 return;
191         }
192         vcpu->arch.cr2 = addr;
193         kvm_queue_exception_e(vcpu, PF_VECTOR, error_code);
194 }
195
196 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
197 {
198         vcpu->arch.nmi_pending = 1;
199 }
200 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
201
202 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
203 {
204         WARN_ON(vcpu->arch.exception.pending);
205         vcpu->arch.exception.pending = true;
206         vcpu->arch.exception.has_error_code = true;
207         vcpu->arch.exception.nr = nr;
208         vcpu->arch.exception.error_code = error_code;
209 }
210 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
211
212 static void __queue_exception(struct kvm_vcpu *vcpu)
213 {
214         kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
215                                      vcpu->arch.exception.has_error_code,
216                                      vcpu->arch.exception.error_code);
217 }
218
219 /*
220  * Load the pae pdptrs.  Return true is they are all valid.
221  */
222 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
223 {
224         gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
225         unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
226         int i;
227         int ret;
228         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
229
230         ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
231                                   offset * sizeof(u64), sizeof(pdpte));
232         if (ret < 0) {
233                 ret = 0;
234                 goto out;
235         }
236         for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
237                 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
238                         ret = 0;
239                         goto out;
240                 }
241         }
242         ret = 1;
243
244         memcpy(vcpu->arch.pdptrs, pdpte, sizeof(vcpu->arch.pdptrs));
245 out:
246
247         return ret;
248 }
249 EXPORT_SYMBOL_GPL(load_pdptrs);
250
251 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
252 {
253         u64 pdpte[ARRAY_SIZE(vcpu->arch.pdptrs)];
254         bool changed = true;
255         int r;
256
257         if (is_long_mode(vcpu) || !is_pae(vcpu))
258                 return false;
259
260         r = kvm_read_guest(vcpu->kvm, vcpu->arch.cr3 & ~31u, pdpte, sizeof(pdpte));
261         if (r < 0)
262                 goto out;
263         changed = memcmp(pdpte, vcpu->arch.pdptrs, sizeof(pdpte)) != 0;
264 out:
265
266         return changed;
267 }
268
269 void kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
270 {
271         if (cr0 & CR0_RESERVED_BITS) {
272                 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
273                        cr0, vcpu->arch.cr0);
274                 kvm_inject_gp(vcpu, 0);
275                 return;
276         }
277
278         if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
279                 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
280                 kvm_inject_gp(vcpu, 0);
281                 return;
282         }
283
284         if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
285                 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
286                        "and a clear PE flag\n");
287                 kvm_inject_gp(vcpu, 0);
288                 return;
289         }
290
291         if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
292 #ifdef CONFIG_X86_64
293                 if ((vcpu->arch.shadow_efer & EFER_LME)) {
294                         int cs_db, cs_l;
295
296                         if (!is_pae(vcpu)) {
297                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
298                                        "in long mode while PAE is disabled\n");
299                                 kvm_inject_gp(vcpu, 0);
300                                 return;
301                         }
302                         kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
303                         if (cs_l) {
304                                 printk(KERN_DEBUG "set_cr0: #GP, start paging "
305                                        "in long mode while CS.L == 1\n");
306                                 kvm_inject_gp(vcpu, 0);
307                                 return;
308
309                         }
310                 } else
311 #endif
312                 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
313                         printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
314                                "reserved bits\n");
315                         kvm_inject_gp(vcpu, 0);
316                         return;
317                 }
318
319         }
320
321         kvm_x86_ops->set_cr0(vcpu, cr0);
322         vcpu->arch.cr0 = cr0;
323
324         kvm_mmu_sync_global(vcpu);
325         kvm_mmu_reset_context(vcpu);
326         return;
327 }
328 EXPORT_SYMBOL_GPL(kvm_set_cr0);
329
330 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
331 {
332         kvm_set_cr0(vcpu, (vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f));
333         KVMTRACE_1D(LMSW, vcpu,
334                     (u32)((vcpu->arch.cr0 & ~0x0ful) | (msw & 0x0f)),
335                     handler);
336 }
337 EXPORT_SYMBOL_GPL(kvm_lmsw);
338
339 void kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
340 {
341         unsigned long old_cr4 = vcpu->arch.cr4;
342         unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
343
344         if (cr4 & CR4_RESERVED_BITS) {
345                 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
346                 kvm_inject_gp(vcpu, 0);
347                 return;
348         }
349
350         if (is_long_mode(vcpu)) {
351                 if (!(cr4 & X86_CR4_PAE)) {
352                         printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
353                                "in long mode\n");
354                         kvm_inject_gp(vcpu, 0);
355                         return;
356                 }
357         } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
358                    && ((cr4 ^ old_cr4) & pdptr_bits)
359                    && !load_pdptrs(vcpu, vcpu->arch.cr3)) {
360                 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
361                 kvm_inject_gp(vcpu, 0);
362                 return;
363         }
364
365         if (cr4 & X86_CR4_VMXE) {
366                 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
367                 kvm_inject_gp(vcpu, 0);
368                 return;
369         }
370         kvm_x86_ops->set_cr4(vcpu, cr4);
371         vcpu->arch.cr4 = cr4;
372         vcpu->arch.mmu.base_role.cr4_pge = (cr4 & X86_CR4_PGE) && !tdp_enabled;
373         kvm_mmu_sync_global(vcpu);
374         kvm_mmu_reset_context(vcpu);
375 }
376 EXPORT_SYMBOL_GPL(kvm_set_cr4);
377
378 void kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
379 {
380         if (cr3 == vcpu->arch.cr3 && !pdptrs_changed(vcpu)) {
381                 kvm_mmu_sync_roots(vcpu);
382                 kvm_mmu_flush_tlb(vcpu);
383                 return;
384         }
385
386         if (is_long_mode(vcpu)) {
387                 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
388                         printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
389                         kvm_inject_gp(vcpu, 0);
390                         return;
391                 }
392         } else {
393                 if (is_pae(vcpu)) {
394                         if (cr3 & CR3_PAE_RESERVED_BITS) {
395                                 printk(KERN_DEBUG
396                                        "set_cr3: #GP, reserved bits\n");
397                                 kvm_inject_gp(vcpu, 0);
398                                 return;
399                         }
400                         if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
401                                 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
402                                        "reserved bits\n");
403                                 kvm_inject_gp(vcpu, 0);
404                                 return;
405                         }
406                 }
407                 /*
408                  * We don't check reserved bits in nonpae mode, because
409                  * this isn't enforced, and VMware depends on this.
410                  */
411         }
412
413         /*
414          * Does the new cr3 value map to physical memory? (Note, we
415          * catch an invalid cr3 even in real-mode, because it would
416          * cause trouble later on when we turn on paging anyway.)
417          *
418          * A real CPU would silently accept an invalid cr3 and would
419          * attempt to use it - with largely undefined (and often hard
420          * to debug) behavior on the guest side.
421          */
422         if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
423                 kvm_inject_gp(vcpu, 0);
424         else {
425                 vcpu->arch.cr3 = cr3;
426                 vcpu->arch.mmu.new_cr3(vcpu);
427         }
428 }
429 EXPORT_SYMBOL_GPL(kvm_set_cr3);
430
431 void kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
432 {
433         if (cr8 & CR8_RESERVED_BITS) {
434                 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
435                 kvm_inject_gp(vcpu, 0);
436                 return;
437         }
438         if (irqchip_in_kernel(vcpu->kvm))
439                 kvm_lapic_set_tpr(vcpu, cr8);
440         else
441                 vcpu->arch.cr8 = cr8;
442 }
443 EXPORT_SYMBOL_GPL(kvm_set_cr8);
444
445 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
446 {
447         if (irqchip_in_kernel(vcpu->kvm))
448                 return kvm_lapic_get_cr8(vcpu);
449         else
450                 return vcpu->arch.cr8;
451 }
452 EXPORT_SYMBOL_GPL(kvm_get_cr8);
453
454 static inline u32 bit(int bitno)
455 {
456         return 1 << (bitno & 31);
457 }
458
459 /*
460  * List of msr numbers which we expose to userspace through KVM_GET_MSRS
461  * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
462  *
463  * This list is modified at module load time to reflect the
464  * capabilities of the host cpu.
465  */
466 static u32 msrs_to_save[] = {
467         MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
468         MSR_K6_STAR,
469 #ifdef CONFIG_X86_64
470         MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
471 #endif
472         MSR_IA32_TIME_STAMP_COUNTER, MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
473         MSR_IA32_PERF_STATUS, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
474 };
475
476 static unsigned num_msrs_to_save;
477
478 static u32 emulated_msrs[] = {
479         MSR_IA32_MISC_ENABLE,
480 };
481
482 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
483 {
484         if (efer & efer_reserved_bits) {
485                 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
486                        efer);
487                 kvm_inject_gp(vcpu, 0);
488                 return;
489         }
490
491         if (is_paging(vcpu)
492             && (vcpu->arch.shadow_efer & EFER_LME) != (efer & EFER_LME)) {
493                 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
494                 kvm_inject_gp(vcpu, 0);
495                 return;
496         }
497
498         if (efer & EFER_FFXSR) {
499                 struct kvm_cpuid_entry2 *feat;
500
501                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
502                 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT))) {
503                         printk(KERN_DEBUG "set_efer: #GP, enable FFXSR w/o CPUID capability\n");
504                         kvm_inject_gp(vcpu, 0);
505                         return;
506                 }
507         }
508
509         if (efer & EFER_SVME) {
510                 struct kvm_cpuid_entry2 *feat;
511
512                 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
513                 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM))) {
514                         printk(KERN_DEBUG "set_efer: #GP, enable SVM w/o SVM\n");
515                         kvm_inject_gp(vcpu, 0);
516                         return;
517                 }
518         }
519
520         kvm_x86_ops->set_efer(vcpu, efer);
521
522         efer &= ~EFER_LMA;
523         efer |= vcpu->arch.shadow_efer & EFER_LMA;
524
525         vcpu->arch.shadow_efer = efer;
526 }
527
528 void kvm_enable_efer_bits(u64 mask)
529 {
530        efer_reserved_bits &= ~mask;
531 }
532 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
533
534
535 /*
536  * Writes msr value into into the appropriate "register".
537  * Returns 0 on success, non-0 otherwise.
538  * Assumes vcpu_load() was already called.
539  */
540 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
541 {
542         return kvm_x86_ops->set_msr(vcpu, msr_index, data);
543 }
544
545 /*
546  * Adapt set_msr() to msr_io()'s calling convention
547  */
548 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
549 {
550         return kvm_set_msr(vcpu, index, *data);
551 }
552
553 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
554 {
555         static int version;
556         struct pvclock_wall_clock wc;
557         struct timespec now, sys, boot;
558
559         if (!wall_clock)
560                 return;
561
562         version++;
563
564         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
565
566         /*
567          * The guest calculates current wall clock time by adding
568          * system time (updated by kvm_write_guest_time below) to the
569          * wall clock specified here.  guest system time equals host
570          * system time for us, thus we must fill in host boot time here.
571          */
572         now = current_kernel_time();
573         ktime_get_ts(&sys);
574         boot = ns_to_timespec(timespec_to_ns(&now) - timespec_to_ns(&sys));
575
576         wc.sec = boot.tv_sec;
577         wc.nsec = boot.tv_nsec;
578         wc.version = version;
579
580         kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
581
582         version++;
583         kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
584 }
585
586 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
587 {
588         uint32_t quotient, remainder;
589
590         /* Don't try to replace with do_div(), this one calculates
591          * "(dividend << 32) / divisor" */
592         __asm__ ( "divl %4"
593                   : "=a" (quotient), "=d" (remainder)
594                   : "0" (0), "1" (dividend), "r" (divisor) );
595         return quotient;
596 }
597
598 static void kvm_set_time_scale(uint32_t tsc_khz, struct pvclock_vcpu_time_info *hv_clock)
599 {
600         uint64_t nsecs = 1000000000LL;
601         int32_t  shift = 0;
602         uint64_t tps64;
603         uint32_t tps32;
604
605         tps64 = tsc_khz * 1000LL;
606         while (tps64 > nsecs*2) {
607                 tps64 >>= 1;
608                 shift--;
609         }
610
611         tps32 = (uint32_t)tps64;
612         while (tps32 <= (uint32_t)nsecs) {
613                 tps32 <<= 1;
614                 shift++;
615         }
616
617         hv_clock->tsc_shift = shift;
618         hv_clock->tsc_to_system_mul = div_frac(nsecs, tps32);
619
620         pr_debug("%s: tsc_khz %u, tsc_shift %d, tsc_mul %u\n",
621                  __func__, tsc_khz, hv_clock->tsc_shift,
622                  hv_clock->tsc_to_system_mul);
623 }
624
625 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
626
627 static void kvm_write_guest_time(struct kvm_vcpu *v)
628 {
629         struct timespec ts;
630         unsigned long flags;
631         struct kvm_vcpu_arch *vcpu = &v->arch;
632         void *shared_kaddr;
633
634         if ((!vcpu->time_page))
635                 return;
636
637         preempt_disable();
638         if (unlikely(vcpu->hv_clock_tsc_khz != __get_cpu_var(cpu_tsc_khz))) {
639                 kvm_set_time_scale(__get_cpu_var(cpu_tsc_khz), &vcpu->hv_clock);
640                 vcpu->hv_clock_tsc_khz = __get_cpu_var(cpu_tsc_khz);
641         }
642         preempt_enable();
643
644         /* Keep irq disabled to prevent changes to the clock */
645         local_irq_save(flags);
646         kvm_get_msr(v, MSR_IA32_TIME_STAMP_COUNTER,
647                           &vcpu->hv_clock.tsc_timestamp);
648         ktime_get_ts(&ts);
649         local_irq_restore(flags);
650
651         /* With all the info we got, fill in the values */
652
653         vcpu->hv_clock.system_time = ts.tv_nsec +
654                                      (NSEC_PER_SEC * (u64)ts.tv_sec);
655         /*
656          * The interface expects us to write an even number signaling that the
657          * update is finished. Since the guest won't see the intermediate
658          * state, we just increase by 2 at the end.
659          */
660         vcpu->hv_clock.version += 2;
661
662         shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
663
664         memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
665                sizeof(vcpu->hv_clock));
666
667         kunmap_atomic(shared_kaddr, KM_USER0);
668
669         mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
670 }
671
672 static int kvm_request_guest_time_update(struct kvm_vcpu *v)
673 {
674         struct kvm_vcpu_arch *vcpu = &v->arch;
675
676         if (!vcpu->time_page)
677                 return 0;
678         set_bit(KVM_REQ_KVMCLOCK_UPDATE, &v->requests);
679         return 1;
680 }
681
682 static bool msr_mtrr_valid(unsigned msr)
683 {
684         switch (msr) {
685         case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
686         case MSR_MTRRfix64K_00000:
687         case MSR_MTRRfix16K_80000:
688         case MSR_MTRRfix16K_A0000:
689         case MSR_MTRRfix4K_C0000:
690         case MSR_MTRRfix4K_C8000:
691         case MSR_MTRRfix4K_D0000:
692         case MSR_MTRRfix4K_D8000:
693         case MSR_MTRRfix4K_E0000:
694         case MSR_MTRRfix4K_E8000:
695         case MSR_MTRRfix4K_F0000:
696         case MSR_MTRRfix4K_F8000:
697         case MSR_MTRRdefType:
698         case MSR_IA32_CR_PAT:
699                 return true;
700         case 0x2f8:
701                 return true;
702         }
703         return false;
704 }
705
706 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
707 {
708         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
709
710         if (!msr_mtrr_valid(msr))
711                 return 1;
712
713         if (msr == MSR_MTRRdefType) {
714                 vcpu->arch.mtrr_state.def_type = data;
715                 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
716         } else if (msr == MSR_MTRRfix64K_00000)
717                 p[0] = data;
718         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
719                 p[1 + msr - MSR_MTRRfix16K_80000] = data;
720         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
721                 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
722         else if (msr == MSR_IA32_CR_PAT)
723                 vcpu->arch.pat = data;
724         else {  /* Variable MTRRs */
725                 int idx, is_mtrr_mask;
726                 u64 *pt;
727
728                 idx = (msr - 0x200) / 2;
729                 is_mtrr_mask = msr - 0x200 - 2 * idx;
730                 if (!is_mtrr_mask)
731                         pt =
732                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
733                 else
734                         pt =
735                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
736                 *pt = data;
737         }
738
739         kvm_mmu_reset_context(vcpu);
740         return 0;
741 }
742
743 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
744 {
745         switch (msr) {
746         case MSR_EFER:
747                 set_efer(vcpu, data);
748                 break;
749         case MSR_IA32_MC0_STATUS:
750                 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
751                        __func__, data);
752                 break;
753         case MSR_IA32_MCG_STATUS:
754                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
755                         __func__, data);
756                 break;
757         case MSR_IA32_MCG_CTL:
758                 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_CTL 0x%llx, nop\n",
759                         __func__, data);
760                 break;
761         case MSR_IA32_DEBUGCTLMSR:
762                 if (!data) {
763                         /* We support the non-activated case already */
764                         break;
765                 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
766                         /* Values other than LBR and BTF are vendor-specific,
767                            thus reserved and should throw a #GP */
768                         return 1;
769                 }
770                 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
771                         __func__, data);
772                 break;
773         case MSR_IA32_UCODE_REV:
774         case MSR_IA32_UCODE_WRITE:
775         case MSR_VM_HSAVE_PA:
776                 break;
777         case 0x200 ... 0x2ff:
778                 return set_msr_mtrr(vcpu, msr, data);
779         case MSR_IA32_APICBASE:
780                 kvm_set_apic_base(vcpu, data);
781                 break;
782         case MSR_IA32_MISC_ENABLE:
783                 vcpu->arch.ia32_misc_enable_msr = data;
784                 break;
785         case MSR_KVM_WALL_CLOCK:
786                 vcpu->kvm->arch.wall_clock = data;
787                 kvm_write_wall_clock(vcpu->kvm, data);
788                 break;
789         case MSR_KVM_SYSTEM_TIME: {
790                 if (vcpu->arch.time_page) {
791                         kvm_release_page_dirty(vcpu->arch.time_page);
792                         vcpu->arch.time_page = NULL;
793                 }
794
795                 vcpu->arch.time = data;
796
797                 /* we verify if the enable bit is set... */
798                 if (!(data & 1))
799                         break;
800
801                 /* ...but clean it before doing the actual write */
802                 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
803
804                 vcpu->arch.time_page =
805                                 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
806
807                 if (is_error_page(vcpu->arch.time_page)) {
808                         kvm_release_page_clean(vcpu->arch.time_page);
809                         vcpu->arch.time_page = NULL;
810                 }
811
812                 kvm_request_guest_time_update(vcpu);
813                 break;
814         }
815         default:
816                 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n", msr, data);
817                 return 1;
818         }
819         return 0;
820 }
821 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
822
823
824 /*
825  * Reads an msr value (of 'msr_index') into 'pdata'.
826  * Returns 0 on success, non-0 otherwise.
827  * Assumes vcpu_load() was already called.
828  */
829 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
830 {
831         return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
832 }
833
834 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
835 {
836         u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
837
838         if (!msr_mtrr_valid(msr))
839                 return 1;
840
841         if (msr == MSR_MTRRdefType)
842                 *pdata = vcpu->arch.mtrr_state.def_type +
843                          (vcpu->arch.mtrr_state.enabled << 10);
844         else if (msr == MSR_MTRRfix64K_00000)
845                 *pdata = p[0];
846         else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
847                 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
848         else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
849                 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
850         else if (msr == MSR_IA32_CR_PAT)
851                 *pdata = vcpu->arch.pat;
852         else {  /* Variable MTRRs */
853                 int idx, is_mtrr_mask;
854                 u64 *pt;
855
856                 idx = (msr - 0x200) / 2;
857                 is_mtrr_mask = msr - 0x200 - 2 * idx;
858                 if (!is_mtrr_mask)
859                         pt =
860                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
861                 else
862                         pt =
863                           (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
864                 *pdata = *pt;
865         }
866
867         return 0;
868 }
869
870 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
871 {
872         u64 data;
873
874         switch (msr) {
875         case 0xc0010010: /* SYSCFG */
876         case 0xc0010015: /* HWCR */
877         case MSR_IA32_PLATFORM_ID:
878         case MSR_IA32_P5_MC_ADDR:
879         case MSR_IA32_P5_MC_TYPE:
880         case MSR_IA32_MC0_CTL:
881         case MSR_IA32_MCG_STATUS:
882         case MSR_IA32_MCG_CAP:
883         case MSR_IA32_MCG_CTL:
884         case MSR_IA32_MC0_MISC:
885         case MSR_IA32_MC0_MISC+4:
886         case MSR_IA32_MC0_MISC+8:
887         case MSR_IA32_MC0_MISC+12:
888         case MSR_IA32_MC0_MISC+16:
889         case MSR_IA32_MC0_MISC+20:
890         case MSR_IA32_UCODE_REV:
891         case MSR_IA32_EBL_CR_POWERON:
892         case MSR_IA32_DEBUGCTLMSR:
893         case MSR_IA32_LASTBRANCHFROMIP:
894         case MSR_IA32_LASTBRANCHTOIP:
895         case MSR_IA32_LASTINTFROMIP:
896         case MSR_IA32_LASTINTTOIP:
897         case MSR_VM_HSAVE_PA:
898         case MSR_P6_EVNTSEL0:
899         case MSR_P6_EVNTSEL1:
900                 data = 0;
901                 break;
902         case MSR_MTRRcap:
903                 data = 0x500 | KVM_NR_VAR_MTRR;
904                 break;
905         case 0x200 ... 0x2ff:
906                 return get_msr_mtrr(vcpu, msr, pdata);
907         case 0xcd: /* fsb frequency */
908                 data = 3;
909                 break;
910         case MSR_IA32_APICBASE:
911                 data = kvm_get_apic_base(vcpu);
912                 break;
913         case MSR_IA32_MISC_ENABLE:
914                 data = vcpu->arch.ia32_misc_enable_msr;
915                 break;
916         case MSR_IA32_PERF_STATUS:
917                 /* TSC increment by tick */
918                 data = 1000ULL;
919                 /* CPU multiplier */
920                 data |= (((uint64_t)4ULL) << 40);
921                 break;
922         case MSR_EFER:
923                 data = vcpu->arch.shadow_efer;
924                 break;
925         case MSR_KVM_WALL_CLOCK:
926                 data = vcpu->kvm->arch.wall_clock;
927                 break;
928         case MSR_KVM_SYSTEM_TIME:
929                 data = vcpu->arch.time;
930                 break;
931         default:
932                 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
933                 return 1;
934         }
935         *pdata = data;
936         return 0;
937 }
938 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
939
940 /*
941  * Read or write a bunch of msrs. All parameters are kernel addresses.
942  *
943  * @return number of msrs set successfully.
944  */
945 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
946                     struct kvm_msr_entry *entries,
947                     int (*do_msr)(struct kvm_vcpu *vcpu,
948                                   unsigned index, u64 *data))
949 {
950         int i;
951
952         vcpu_load(vcpu);
953
954         down_read(&vcpu->kvm->slots_lock);
955         for (i = 0; i < msrs->nmsrs; ++i)
956                 if (do_msr(vcpu, entries[i].index, &entries[i].data))
957                         break;
958         up_read(&vcpu->kvm->slots_lock);
959
960         vcpu_put(vcpu);
961
962         return i;
963 }
964
965 /*
966  * Read or write a bunch of msrs. Parameters are user addresses.
967  *
968  * @return number of msrs set successfully.
969  */
970 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
971                   int (*do_msr)(struct kvm_vcpu *vcpu,
972                                 unsigned index, u64 *data),
973                   int writeback)
974 {
975         struct kvm_msrs msrs;
976         struct kvm_msr_entry *entries;
977         int r, n;
978         unsigned size;
979
980         r = -EFAULT;
981         if (copy_from_user(&msrs, user_msrs, sizeof msrs))
982                 goto out;
983
984         r = -E2BIG;
985         if (msrs.nmsrs >= MAX_IO_MSRS)
986                 goto out;
987
988         r = -ENOMEM;
989         size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
990         entries = vmalloc(size);
991         if (!entries)
992                 goto out;
993
994         r = -EFAULT;
995         if (copy_from_user(entries, user_msrs->entries, size))
996                 goto out_free;
997
998         r = n = __msr_io(vcpu, &msrs, entries, do_msr);
999         if (r < 0)
1000                 goto out_free;
1001
1002         r = -EFAULT;
1003         if (writeback && copy_to_user(user_msrs->entries, entries, size))
1004                 goto out_free;
1005
1006         r = n;
1007
1008 out_free:
1009         vfree(entries);
1010 out:
1011         return r;
1012 }
1013
1014 int kvm_dev_ioctl_check_extension(long ext)
1015 {
1016         int r;
1017
1018         switch (ext) {
1019         case KVM_CAP_IRQCHIP:
1020         case KVM_CAP_HLT:
1021         case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1022         case KVM_CAP_SET_TSS_ADDR:
1023         case KVM_CAP_EXT_CPUID:
1024         case KVM_CAP_CLOCKSOURCE:
1025         case KVM_CAP_PIT:
1026         case KVM_CAP_NOP_IO_DELAY:
1027         case KVM_CAP_MP_STATE:
1028         case KVM_CAP_SYNC_MMU:
1029         case KVM_CAP_REINJECT_CONTROL:
1030         case KVM_CAP_IRQ_INJECT_STATUS:
1031         case KVM_CAP_ASSIGN_DEV_IRQ:
1032                 r = 1;
1033                 break;
1034         case KVM_CAP_COALESCED_MMIO:
1035                 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
1036                 break;
1037         case KVM_CAP_VAPIC:
1038                 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
1039                 break;
1040         case KVM_CAP_NR_VCPUS:
1041                 r = KVM_MAX_VCPUS;
1042                 break;
1043         case KVM_CAP_NR_MEMSLOTS:
1044                 r = KVM_MEMORY_SLOTS;
1045                 break;
1046         case KVM_CAP_PV_MMU:
1047                 r = !tdp_enabled;
1048                 break;
1049         case KVM_CAP_IOMMU:
1050                 r = iommu_found();
1051                 break;
1052         default:
1053                 r = 0;
1054                 break;
1055         }
1056         return r;
1057
1058 }
1059
1060 long kvm_arch_dev_ioctl(struct file *filp,
1061                         unsigned int ioctl, unsigned long arg)
1062 {
1063         void __user *argp = (void __user *)arg;
1064         long r;
1065
1066         switch (ioctl) {
1067         case KVM_GET_MSR_INDEX_LIST: {
1068                 struct kvm_msr_list __user *user_msr_list = argp;
1069                 struct kvm_msr_list msr_list;
1070                 unsigned n;
1071
1072                 r = -EFAULT;
1073                 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1074                         goto out;
1075                 n = msr_list.nmsrs;
1076                 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1077                 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1078                         goto out;
1079                 r = -E2BIG;
1080                 if (n < num_msrs_to_save)
1081                         goto out;
1082                 r = -EFAULT;
1083                 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1084                                  num_msrs_to_save * sizeof(u32)))
1085                         goto out;
1086                 if (copy_to_user(user_msr_list->indices
1087                                  + num_msrs_to_save * sizeof(u32),
1088                                  &emulated_msrs,
1089                                  ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1090                         goto out;
1091                 r = 0;
1092                 break;
1093         }
1094         case KVM_GET_SUPPORTED_CPUID: {
1095                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1096                 struct kvm_cpuid2 cpuid;
1097
1098                 r = -EFAULT;
1099                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1100                         goto out;
1101                 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
1102                                                       cpuid_arg->entries);
1103                 if (r)
1104                         goto out;
1105
1106                 r = -EFAULT;
1107                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1108                         goto out;
1109                 r = 0;
1110                 break;
1111         }
1112         default:
1113                 r = -EINVAL;
1114         }
1115 out:
1116         return r;
1117 }
1118
1119 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
1120 {
1121         kvm_x86_ops->vcpu_load(vcpu, cpu);
1122         kvm_request_guest_time_update(vcpu);
1123 }
1124
1125 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
1126 {
1127         kvm_x86_ops->vcpu_put(vcpu);
1128         kvm_put_guest_fpu(vcpu);
1129 }
1130
1131 static int is_efer_nx(void)
1132 {
1133         unsigned long long efer = 0;
1134
1135         rdmsrl_safe(MSR_EFER, &efer);
1136         return efer & EFER_NX;
1137 }
1138
1139 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
1140 {
1141         int i;
1142         struct kvm_cpuid_entry2 *e, *entry;
1143
1144         entry = NULL;
1145         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
1146                 e = &vcpu->arch.cpuid_entries[i];
1147                 if (e->function == 0x80000001) {
1148                         entry = e;
1149                         break;
1150                 }
1151         }
1152         if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
1153                 entry->edx &= ~(1 << 20);
1154                 printk(KERN_INFO "kvm: guest NX capability removed\n");
1155         }
1156 }
1157
1158 /* when an old userspace process fills a new kernel module */
1159 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
1160                                     struct kvm_cpuid *cpuid,
1161                                     struct kvm_cpuid_entry __user *entries)
1162 {
1163         int r, i;
1164         struct kvm_cpuid_entry *cpuid_entries;
1165
1166         r = -E2BIG;
1167         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1168                 goto out;
1169         r = -ENOMEM;
1170         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
1171         if (!cpuid_entries)
1172                 goto out;
1173         r = -EFAULT;
1174         if (copy_from_user(cpuid_entries, entries,
1175                            cpuid->nent * sizeof(struct kvm_cpuid_entry)))
1176                 goto out_free;
1177         for (i = 0; i < cpuid->nent; i++) {
1178                 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
1179                 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
1180                 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
1181                 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
1182                 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
1183                 vcpu->arch.cpuid_entries[i].index = 0;
1184                 vcpu->arch.cpuid_entries[i].flags = 0;
1185                 vcpu->arch.cpuid_entries[i].padding[0] = 0;
1186                 vcpu->arch.cpuid_entries[i].padding[1] = 0;
1187                 vcpu->arch.cpuid_entries[i].padding[2] = 0;
1188         }
1189         vcpu->arch.cpuid_nent = cpuid->nent;
1190         cpuid_fix_nx_cap(vcpu);
1191         r = 0;
1192
1193 out_free:
1194         vfree(cpuid_entries);
1195 out:
1196         return r;
1197 }
1198
1199 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
1200                                      struct kvm_cpuid2 *cpuid,
1201                                      struct kvm_cpuid_entry2 __user *entries)
1202 {
1203         int r;
1204
1205         r = -E2BIG;
1206         if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
1207                 goto out;
1208         r = -EFAULT;
1209         if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
1210                            cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
1211                 goto out;
1212         vcpu->arch.cpuid_nent = cpuid->nent;
1213         return 0;
1214
1215 out:
1216         return r;
1217 }
1218
1219 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
1220                                      struct kvm_cpuid2 *cpuid,
1221                                      struct kvm_cpuid_entry2 __user *entries)
1222 {
1223         int r;
1224
1225         r = -E2BIG;
1226         if (cpuid->nent < vcpu->arch.cpuid_nent)
1227                 goto out;
1228         r = -EFAULT;
1229         if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
1230                          vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
1231                 goto out;
1232         return 0;
1233
1234 out:
1235         cpuid->nent = vcpu->arch.cpuid_nent;
1236         return r;
1237 }
1238
1239 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1240                            u32 index)
1241 {
1242         entry->function = function;
1243         entry->index = index;
1244         cpuid_count(entry->function, entry->index,
1245                     &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
1246         entry->flags = 0;
1247 }
1248
1249 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
1250                          u32 index, int *nent, int maxnent)
1251 {
1252         const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
1253                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1254                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1255                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1256                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1257                 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
1258                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1259                 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
1260                 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
1261                 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
1262         const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
1263                 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
1264                 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
1265                 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
1266                 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
1267                 bit(X86_FEATURE_PGE) |
1268                 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
1269                 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
1270                 bit(X86_FEATURE_SYSCALL) |
1271                 (is_efer_nx() ? bit(X86_FEATURE_NX) : 0) |
1272 #ifdef CONFIG_X86_64
1273                 bit(X86_FEATURE_LM) |
1274 #endif
1275                 bit(X86_FEATURE_FXSR_OPT) |
1276                 bit(X86_FEATURE_MMXEXT) |
1277                 bit(X86_FEATURE_3DNOWEXT) |
1278                 bit(X86_FEATURE_3DNOW);
1279         const u32 kvm_supported_word3_x86_features =
1280                 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
1281         const u32 kvm_supported_word6_x86_features =
1282                 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY) |
1283                 bit(X86_FEATURE_SVM);
1284
1285         /* all calls to cpuid_count() should be made on the same cpu */
1286         get_cpu();
1287         do_cpuid_1_ent(entry, function, index);
1288         ++*nent;
1289
1290         switch (function) {
1291         case 0:
1292                 entry->eax = min(entry->eax, (u32)0xb);
1293                 break;
1294         case 1:
1295                 entry->edx &= kvm_supported_word0_x86_features;
1296                 entry->ecx &= kvm_supported_word3_x86_features;
1297                 break;
1298         /* function 2 entries are STATEFUL. That is, repeated cpuid commands
1299          * may return different values. This forces us to get_cpu() before
1300          * issuing the first command, and also to emulate this annoying behavior
1301          * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
1302         case 2: {
1303                 int t, times = entry->eax & 0xff;
1304
1305                 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1306                 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
1307                 for (t = 1; t < times && *nent < maxnent; ++t) {
1308                         do_cpuid_1_ent(&entry[t], function, 0);
1309                         entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
1310                         ++*nent;
1311                 }
1312                 break;
1313         }
1314         /* function 4 and 0xb have additional index. */
1315         case 4: {
1316                 int i, cache_type;
1317
1318                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1319                 /* read more entries until cache_type is zero */
1320                 for (i = 1; *nent < maxnent; ++i) {
1321                         cache_type = entry[i - 1].eax & 0x1f;
1322                         if (!cache_type)
1323                                 break;
1324                         do_cpuid_1_ent(&entry[i], function, i);
1325                         entry[i].flags |=
1326                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1327                         ++*nent;
1328                 }
1329                 break;
1330         }
1331         case 0xb: {
1332                 int i, level_type;
1333
1334                 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1335                 /* read more entries until level_type is zero */
1336                 for (i = 1; *nent < maxnent; ++i) {
1337                         level_type = entry[i - 1].ecx & 0xff00;
1338                         if (!level_type)
1339                                 break;
1340                         do_cpuid_1_ent(&entry[i], function, i);
1341                         entry[i].flags |=
1342                                KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
1343                         ++*nent;
1344                 }
1345                 break;
1346         }
1347         case 0x80000000:
1348                 entry->eax = min(entry->eax, 0x8000001a);
1349                 break;
1350         case 0x80000001:
1351                 entry->edx &= kvm_supported_word1_x86_features;
1352                 entry->ecx &= kvm_supported_word6_x86_features;
1353                 break;
1354         }
1355         put_cpu();
1356 }
1357
1358 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
1359                                      struct kvm_cpuid_entry2 __user *entries)
1360 {
1361         struct kvm_cpuid_entry2 *cpuid_entries;
1362         int limit, nent = 0, r = -E2BIG;
1363         u32 func;
1364
1365         if (cpuid->nent < 1)
1366                 goto out;
1367         r = -ENOMEM;
1368         cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
1369         if (!cpuid_entries)
1370                 goto out;
1371
1372         do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
1373         limit = cpuid_entries[0].eax;
1374         for (func = 1; func <= limit && nent < cpuid->nent; ++func)
1375                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1376                              &nent, cpuid->nent);
1377         r = -E2BIG;
1378         if (nent >= cpuid->nent)
1379                 goto out_free;
1380
1381         do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
1382         limit = cpuid_entries[nent - 1].eax;
1383         for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
1384                 do_cpuid_ent(&cpuid_entries[nent], func, 0,
1385                              &nent, cpuid->nent);
1386         r = -EFAULT;
1387         if (copy_to_user(entries, cpuid_entries,
1388                          nent * sizeof(struct kvm_cpuid_entry2)))
1389                 goto out_free;
1390         cpuid->nent = nent;
1391         r = 0;
1392
1393 out_free:
1394         vfree(cpuid_entries);
1395 out:
1396         return r;
1397 }
1398
1399 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
1400                                     struct kvm_lapic_state *s)
1401 {
1402         vcpu_load(vcpu);
1403         memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
1404         vcpu_put(vcpu);
1405
1406         return 0;
1407 }
1408
1409 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
1410                                     struct kvm_lapic_state *s)
1411 {
1412         vcpu_load(vcpu);
1413         memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
1414         kvm_apic_post_state_restore(vcpu);
1415         vcpu_put(vcpu);
1416
1417         return 0;
1418 }
1419
1420 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1421                                     struct kvm_interrupt *irq)
1422 {
1423         if (irq->irq < 0 || irq->irq >= 256)
1424                 return -EINVAL;
1425         if (irqchip_in_kernel(vcpu->kvm))
1426                 return -ENXIO;
1427         vcpu_load(vcpu);
1428
1429         set_bit(irq->irq, vcpu->arch.irq_pending);
1430         set_bit(irq->irq / BITS_PER_LONG, &vcpu->arch.irq_summary);
1431
1432         vcpu_put(vcpu);
1433
1434         return 0;
1435 }
1436
1437 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
1438 {
1439         vcpu_load(vcpu);
1440         kvm_inject_nmi(vcpu);
1441         vcpu_put(vcpu);
1442
1443         return 0;
1444 }
1445
1446 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
1447                                            struct kvm_tpr_access_ctl *tac)
1448 {
1449         if (tac->flags)
1450                 return -EINVAL;
1451         vcpu->arch.tpr_access_reporting = !!tac->enabled;
1452         return 0;
1453 }
1454
1455 long kvm_arch_vcpu_ioctl(struct file *filp,
1456                          unsigned int ioctl, unsigned long arg)
1457 {
1458         struct kvm_vcpu *vcpu = filp->private_data;
1459         void __user *argp = (void __user *)arg;
1460         int r;
1461         struct kvm_lapic_state *lapic = NULL;
1462
1463         switch (ioctl) {
1464         case KVM_GET_LAPIC: {
1465                 lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1466
1467                 r = -ENOMEM;
1468                 if (!lapic)
1469                         goto out;
1470                 r = kvm_vcpu_ioctl_get_lapic(vcpu, lapic);
1471                 if (r)
1472                         goto out;
1473                 r = -EFAULT;
1474                 if (copy_to_user(argp, lapic, sizeof(struct kvm_lapic_state)))
1475                         goto out;
1476                 r = 0;
1477                 break;
1478         }
1479         case KVM_SET_LAPIC: {
1480                 lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
1481                 r = -ENOMEM;
1482                 if (!lapic)
1483                         goto out;
1484                 r = -EFAULT;
1485                 if (copy_from_user(lapic, argp, sizeof(struct kvm_lapic_state)))
1486                         goto out;
1487                 r = kvm_vcpu_ioctl_set_lapic(vcpu, lapic);
1488                 if (r)
1489                         goto out;
1490                 r = 0;
1491                 break;
1492         }
1493         case KVM_INTERRUPT: {
1494                 struct kvm_interrupt irq;
1495
1496                 r = -EFAULT;
1497                 if (copy_from_user(&irq, argp, sizeof irq))
1498                         goto out;
1499                 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
1500                 if (r)
1501                         goto out;
1502                 r = 0;
1503                 break;
1504         }
1505         case KVM_NMI: {
1506                 r = kvm_vcpu_ioctl_nmi(vcpu);
1507                 if (r)
1508                         goto out;
1509                 r = 0;
1510                 break;
1511         }
1512         case KVM_SET_CPUID: {
1513                 struct kvm_cpuid __user *cpuid_arg = argp;
1514                 struct kvm_cpuid cpuid;
1515
1516                 r = -EFAULT;
1517                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1518                         goto out;
1519                 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1520                 if (r)
1521                         goto out;
1522                 break;
1523         }
1524         case KVM_SET_CPUID2: {
1525                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1526                 struct kvm_cpuid2 cpuid;
1527
1528                 r = -EFAULT;
1529                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1530                         goto out;
1531                 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1532                                               cpuid_arg->entries);
1533                 if (r)
1534                         goto out;
1535                 break;
1536         }
1537         case KVM_GET_CPUID2: {
1538                 struct kvm_cpuid2 __user *cpuid_arg = argp;
1539                 struct kvm_cpuid2 cpuid;
1540
1541                 r = -EFAULT;
1542                 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1543                         goto out;
1544                 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1545                                               cpuid_arg->entries);
1546                 if (r)
1547                         goto out;
1548                 r = -EFAULT;
1549                 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1550                         goto out;
1551                 r = 0;
1552                 break;
1553         }
1554         case KVM_GET_MSRS:
1555                 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1556                 break;
1557         case KVM_SET_MSRS:
1558                 r = msr_io(vcpu, argp, do_set_msr, 0);
1559                 break;
1560         case KVM_TPR_ACCESS_REPORTING: {
1561                 struct kvm_tpr_access_ctl tac;
1562
1563                 r = -EFAULT;
1564                 if (copy_from_user(&tac, argp, sizeof tac))
1565                         goto out;
1566                 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
1567                 if (r)
1568                         goto out;
1569                 r = -EFAULT;
1570                 if (copy_to_user(argp, &tac, sizeof tac))
1571                         goto out;
1572                 r = 0;
1573                 break;
1574         };
1575         case KVM_SET_VAPIC_ADDR: {
1576                 struct kvm_vapic_addr va;
1577
1578                 r = -EINVAL;
1579                 if (!irqchip_in_kernel(vcpu->kvm))
1580                         goto out;
1581                 r = -EFAULT;
1582                 if (copy_from_user(&va, argp, sizeof va))
1583                         goto out;
1584                 r = 0;
1585                 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
1586                 break;
1587         }
1588         default:
1589                 r = -EINVAL;
1590         }
1591 out:
1592         if (lapic)
1593                 kfree(lapic);
1594         return r;
1595 }
1596
1597 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1598 {
1599         int ret;
1600
1601         if (addr > (unsigned int)(-3 * PAGE_SIZE))
1602                 return -1;
1603         ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1604         return ret;
1605 }
1606
1607 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1608                                           u32 kvm_nr_mmu_pages)
1609 {
1610         if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1611                 return -EINVAL;
1612
1613         down_write(&kvm->slots_lock);
1614
1615         kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1616         kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
1617
1618         up_write(&kvm->slots_lock);
1619         return 0;
1620 }
1621
1622 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1623 {
1624         return kvm->arch.n_alloc_mmu_pages;
1625 }
1626
1627 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
1628 {
1629         int i;
1630         struct kvm_mem_alias *alias;
1631
1632         for (i = 0; i < kvm->arch.naliases; ++i) {
1633                 alias = &kvm->arch.aliases[i];
1634                 if (gfn >= alias->base_gfn
1635                     && gfn < alias->base_gfn + alias->npages)
1636                         return alias->target_gfn + gfn - alias->base_gfn;
1637         }
1638         return gfn;
1639 }
1640
1641 /*
1642  * Set a new alias region.  Aliases map a portion of physical memory into
1643  * another portion.  This is useful for memory windows, for example the PC
1644  * VGA region.
1645  */
1646 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1647                                          struct kvm_memory_alias *alias)
1648 {
1649         int r, n;
1650         struct kvm_mem_alias *p;
1651
1652         r = -EINVAL;
1653         /* General sanity checks */
1654         if (alias->memory_size & (PAGE_SIZE - 1))
1655                 goto out;
1656         if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1657                 goto out;
1658         if (alias->slot >= KVM_ALIAS_SLOTS)
1659                 goto out;
1660         if (alias->guest_phys_addr + alias->memory_size
1661             < alias->guest_phys_addr)
1662                 goto out;
1663         if (alias->target_phys_addr + alias->memory_size
1664             < alias->target_phys_addr)
1665                 goto out;
1666
1667         down_write(&kvm->slots_lock);
1668         spin_lock(&kvm->mmu_lock);
1669
1670         p = &kvm->arch.aliases[alias->slot];
1671         p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1672         p->npages = alias->memory_size >> PAGE_SHIFT;
1673         p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1674
1675         for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1676                 if (kvm->arch.aliases[n - 1].npages)
1677                         break;
1678         kvm->arch.naliases = n;
1679
1680         spin_unlock(&kvm->mmu_lock);
1681         kvm_mmu_zap_all(kvm);
1682
1683         up_write(&kvm->slots_lock);
1684
1685         return 0;
1686
1687 out:
1688         return r;
1689 }
1690
1691 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1692 {
1693         int r;
1694
1695         r = 0;
1696         switch (chip->chip_id) {
1697         case KVM_IRQCHIP_PIC_MASTER:
1698                 memcpy(&chip->chip.pic,
1699                         &pic_irqchip(kvm)->pics[0],
1700                         sizeof(struct kvm_pic_state));
1701                 break;
1702         case KVM_IRQCHIP_PIC_SLAVE:
1703                 memcpy(&chip->chip.pic,
1704                         &pic_irqchip(kvm)->pics[1],
1705                         sizeof(struct kvm_pic_state));
1706                 break;
1707         case KVM_IRQCHIP_IOAPIC:
1708                 memcpy(&chip->chip.ioapic,
1709                         ioapic_irqchip(kvm),
1710                         sizeof(struct kvm_ioapic_state));
1711                 break;
1712         default:
1713                 r = -EINVAL;
1714                 break;
1715         }
1716         return r;
1717 }
1718
1719 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1720 {
1721         int r;
1722
1723         r = 0;
1724         switch (chip->chip_id) {
1725         case KVM_IRQCHIP_PIC_MASTER:
1726                 memcpy(&pic_irqchip(kvm)->pics[0],
1727                         &chip->chip.pic,
1728                         sizeof(struct kvm_pic_state));
1729                 break;
1730         case KVM_IRQCHIP_PIC_SLAVE:
1731                 memcpy(&pic_irqchip(kvm)->pics[1],
1732                         &chip->chip.pic,
1733                         sizeof(struct kvm_pic_state));
1734                 break;
1735         case KVM_IRQCHIP_IOAPIC:
1736                 memcpy(ioapic_irqchip(kvm),
1737                         &chip->chip.ioapic,
1738                         sizeof(struct kvm_ioapic_state));
1739                 break;
1740         default:
1741                 r = -EINVAL;
1742                 break;
1743         }
1744         kvm_pic_update_irq(pic_irqchip(kvm));
1745         return r;
1746 }
1747
1748 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1749 {
1750         int r = 0;
1751
1752         memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
1753         return r;
1754 }
1755
1756 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
1757 {
1758         int r = 0;
1759
1760         memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
1761         kvm_pit_load_count(kvm, 0, ps->channels[0].count);
1762         return r;
1763 }
1764
1765 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
1766                                  struct kvm_reinject_control *control)
1767 {
1768         if (!kvm->arch.vpit)
1769                 return -ENXIO;
1770         kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
1771         return 0;
1772 }
1773
1774 /*
1775  * Get (and clear) the dirty memory log for a memory slot.
1776  */
1777 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1778                                       struct kvm_dirty_log *log)
1779 {
1780         int r;
1781         int n;
1782         struct kvm_memory_slot *memslot;
1783         int is_dirty = 0;
1784
1785         down_write(&kvm->slots_lock);
1786
1787         r = kvm_get_dirty_log(kvm, log, &is_dirty);
1788         if (r)
1789                 goto out;
1790
1791         /* If nothing is dirty, don't bother messing with page tables. */
1792         if (is_dirty) {
1793                 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1794                 kvm_flush_remote_tlbs(kvm);
1795                 memslot = &kvm->memslots[log->slot];
1796                 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1797                 memset(memslot->dirty_bitmap, 0, n);
1798         }
1799         r = 0;
1800 out:
1801         up_write(&kvm->slots_lock);
1802         return r;
1803 }
1804
1805 long kvm_arch_vm_ioctl(struct file *filp,
1806                        unsigned int ioctl, unsigned long arg)
1807 {
1808         struct kvm *kvm = filp->private_data;
1809         void __user *argp = (void __user *)arg;
1810         int r = -EINVAL;
1811         /*
1812          * This union makes it completely explicit to gcc-3.x
1813          * that these two variables' stack usage should be
1814          * combined, not added together.
1815          */
1816         union {
1817                 struct kvm_pit_state ps;
1818                 struct kvm_memory_alias alias;
1819         } u;
1820
1821         switch (ioctl) {
1822         case KVM_SET_TSS_ADDR:
1823                 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1824                 if (r < 0)
1825                         goto out;
1826                 break;
1827         case KVM_SET_MEMORY_REGION: {
1828                 struct kvm_memory_region kvm_mem;
1829                 struct kvm_userspace_memory_region kvm_userspace_mem;
1830
1831                 r = -EFAULT;
1832                 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1833                         goto out;
1834                 kvm_userspace_mem.slot = kvm_mem.slot;
1835                 kvm_userspace_mem.flags = kvm_mem.flags;
1836                 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1837                 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1838                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1839                 if (r)
1840                         goto out;
1841                 break;
1842         }
1843         case KVM_SET_NR_MMU_PAGES:
1844                 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1845                 if (r)
1846                         goto out;
1847                 break;
1848         case KVM_GET_NR_MMU_PAGES:
1849                 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1850                 break;
1851         case KVM_SET_MEMORY_ALIAS:
1852                 r = -EFAULT;
1853                 if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
1854                         goto out;
1855                 r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
1856                 if (r)
1857                         goto out;
1858                 break;
1859         case KVM_CREATE_IRQCHIP:
1860                 r = -ENOMEM;
1861                 kvm->arch.vpic = kvm_create_pic(kvm);
1862                 if (kvm->arch.vpic) {
1863                         r = kvm_ioapic_init(kvm);
1864                         if (r) {
1865                                 kfree(kvm->arch.vpic);
1866                                 kvm->arch.vpic = NULL;
1867                                 goto out;
1868                         }
1869                 } else
1870                         goto out;
1871                 r = kvm_setup_default_irq_routing(kvm);
1872                 if (r) {
1873                         kfree(kvm->arch.vpic);
1874                         kfree(kvm->arch.vioapic);
1875                         goto out;
1876                 }
1877                 break;
1878         case KVM_CREATE_PIT:
1879                 mutex_lock(&kvm->lock);
1880                 r = -EEXIST;
1881                 if (kvm->arch.vpit)
1882                         goto create_pit_unlock;
1883                 r = -ENOMEM;
1884                 kvm->arch.vpit = kvm_create_pit(kvm);
1885                 if (kvm->arch.vpit)
1886                         r = 0;
1887         create_pit_unlock:
1888                 mutex_unlock(&kvm->lock);
1889                 break;
1890         case KVM_IRQ_LINE_STATUS:
1891         case KVM_IRQ_LINE: {
1892                 struct kvm_irq_level irq_event;
1893
1894                 r = -EFAULT;
1895                 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1896                         goto out;
1897                 if (irqchip_in_kernel(kvm)) {
1898                         __s32 status;
1899                         mutex_lock(&kvm->lock);
1900                         status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
1901                                         irq_event.irq, irq_event.level);
1902                         mutex_unlock(&kvm->lock);
1903                         if (ioctl == KVM_IRQ_LINE_STATUS) {
1904                                 irq_event.status = status;
1905                                 if (copy_to_user(argp, &irq_event,
1906                                                         sizeof irq_event))
1907                                         goto out;
1908                         }
1909                         r = 0;
1910                 }
1911                 break;
1912         }
1913         case KVM_GET_IRQCHIP: {
1914                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1915                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
1916
1917                 r = -ENOMEM;
1918                 if (!chip)
1919                         goto out;
1920                 r = -EFAULT;
1921                 if (copy_from_user(chip, argp, sizeof *chip))
1922                         goto get_irqchip_out;
1923                 r = -ENXIO;
1924                 if (!irqchip_in_kernel(kvm))
1925                         goto get_irqchip_out;
1926                 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
1927                 if (r)
1928                         goto get_irqchip_out;
1929                 r = -EFAULT;
1930                 if (copy_to_user(argp, chip, sizeof *chip))
1931                         goto get_irqchip_out;
1932                 r = 0;
1933         get_irqchip_out:
1934                 kfree(chip);
1935                 if (r)
1936                         goto out;
1937                 break;
1938         }
1939         case KVM_SET_IRQCHIP: {
1940                 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1941                 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
1942
1943                 r = -ENOMEM;
1944                 if (!chip)
1945                         goto out;
1946                 r = -EFAULT;
1947                 if (copy_from_user(chip, argp, sizeof *chip))
1948                         goto set_irqchip_out;
1949                 r = -ENXIO;
1950                 if (!irqchip_in_kernel(kvm))
1951                         goto set_irqchip_out;
1952                 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
1953                 if (r)
1954                         goto set_irqchip_out;
1955                 r = 0;
1956         set_irqchip_out:
1957                 kfree(chip);
1958                 if (r)
1959                         goto out;
1960                 break;
1961         }
1962         case KVM_GET_PIT: {
1963                 r = -EFAULT;
1964                 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
1965                         goto out;
1966                 r = -ENXIO;
1967                 if (!kvm->arch.vpit)
1968                         goto out;
1969                 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
1970                 if (r)
1971                         goto out;
1972                 r = -EFAULT;
1973                 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
1974                         goto out;
1975                 r = 0;
1976                 break;
1977         }
1978         case KVM_SET_PIT: {
1979                 r = -EFAULT;
1980                 if (copy_from_user(&u.ps, argp, sizeof u.ps))
1981                         goto out;
1982                 r = -ENXIO;
1983                 if (!kvm->arch.vpit)
1984                         goto out;
1985                 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
1986                 if (r)
1987                         goto out;
1988                 r = 0;
1989                 break;
1990         }
1991         case KVM_REINJECT_CONTROL: {
1992                 struct kvm_reinject_control control;
1993                 r =  -EFAULT;
1994                 if (copy_from_user(&control, argp, sizeof(control)))
1995                         goto out;
1996                 r = kvm_vm_ioctl_reinject(kvm, &control);
1997                 if (r)
1998                         goto out;
1999                 r = 0;
2000                 break;
2001         }
2002         default:
2003                 ;
2004         }
2005 out:
2006         return r;
2007 }
2008
2009 static void kvm_init_msr_list(void)
2010 {
2011         u32 dummy[2];
2012         unsigned i, j;
2013
2014         for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
2015                 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
2016                         continue;
2017                 if (j < i)
2018                         msrs_to_save[j] = msrs_to_save[i];
2019                 j++;
2020         }
2021         num_msrs_to_save = j;
2022 }
2023
2024 /*
2025  * Only apic need an MMIO device hook, so shortcut now..
2026  */
2027 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
2028                                                 gpa_t addr, int len,
2029                                                 int is_write)
2030 {
2031         struct kvm_io_device *dev;
2032
2033         if (vcpu->arch.apic) {
2034                 dev = &vcpu->arch.apic->dev;
2035                 if (dev->in_range(dev, addr, len, is_write))
2036                         return dev;
2037         }
2038         return NULL;
2039 }
2040
2041
2042 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
2043                                                 gpa_t addr, int len,
2044                                                 int is_write)
2045 {
2046         struct kvm_io_device *dev;
2047
2048         dev = vcpu_find_pervcpu_dev(vcpu, addr, len, is_write);
2049         if (dev == NULL)
2050                 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr, len,
2051                                           is_write);
2052         return dev;
2053 }
2054
2055 static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
2056                                struct kvm_vcpu *vcpu)
2057 {
2058         void *data = val;
2059         int r = X86EMUL_CONTINUE;
2060
2061         while (bytes) {
2062                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2063                 unsigned offset = addr & (PAGE_SIZE-1);
2064                 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
2065                 int ret;
2066
2067                 if (gpa == UNMAPPED_GVA) {
2068                         r = X86EMUL_PROPAGATE_FAULT;
2069                         goto out;
2070                 }
2071                 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
2072                 if (ret < 0) {
2073                         r = X86EMUL_UNHANDLEABLE;
2074                         goto out;
2075                 }
2076
2077                 bytes -= toread;
2078                 data += toread;
2079                 addr += toread;
2080         }
2081 out:
2082         return r;
2083 }
2084
2085 static int kvm_write_guest_virt(gva_t addr, void *val, unsigned int bytes,
2086                                 struct kvm_vcpu *vcpu)
2087 {
2088         void *data = val;
2089         int r = X86EMUL_CONTINUE;
2090
2091         while (bytes) {
2092                 gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2093                 unsigned offset = addr & (PAGE_SIZE-1);
2094                 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
2095                 int ret;
2096
2097                 if (gpa == UNMAPPED_GVA) {
2098                         r = X86EMUL_PROPAGATE_FAULT;
2099                         goto out;
2100                 }
2101                 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
2102                 if (ret < 0) {
2103                         r = X86EMUL_UNHANDLEABLE;
2104                         goto out;
2105                 }
2106
2107                 bytes -= towrite;
2108                 data += towrite;
2109                 addr += towrite;
2110         }
2111 out:
2112         return r;
2113 }
2114
2115
2116 static int emulator_read_emulated(unsigned long addr,
2117                                   void *val,
2118                                   unsigned int bytes,
2119                                   struct kvm_vcpu *vcpu)
2120 {
2121         struct kvm_io_device *mmio_dev;
2122         gpa_t                 gpa;
2123
2124         if (vcpu->mmio_read_completed) {
2125                 memcpy(val, vcpu->mmio_data, bytes);
2126                 vcpu->mmio_read_completed = 0;
2127                 return X86EMUL_CONTINUE;
2128         }
2129
2130         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2131
2132         /* For APIC access vmexit */
2133         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2134                 goto mmio;
2135
2136         if (kvm_read_guest_virt(addr, val, bytes, vcpu)
2137                                 == X86EMUL_CONTINUE)
2138                 return X86EMUL_CONTINUE;
2139         if (gpa == UNMAPPED_GVA)
2140                 return X86EMUL_PROPAGATE_FAULT;
2141
2142 mmio:
2143         /*
2144          * Is this MMIO handled locally?
2145          */
2146         mutex_lock(&vcpu->kvm->lock);
2147         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 0);
2148         if (mmio_dev) {
2149                 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
2150                 mutex_unlock(&vcpu->kvm->lock);
2151                 return X86EMUL_CONTINUE;
2152         }
2153         mutex_unlock(&vcpu->kvm->lock);
2154
2155         vcpu->mmio_needed = 1;
2156         vcpu->mmio_phys_addr = gpa;
2157         vcpu->mmio_size = bytes;
2158         vcpu->mmio_is_write = 0;
2159
2160         return X86EMUL_UNHANDLEABLE;
2161 }
2162
2163 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
2164                           const void *val, int bytes)
2165 {
2166         int ret;
2167
2168         ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
2169         if (ret < 0)
2170                 return 0;
2171         kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
2172         return 1;
2173 }
2174
2175 static int emulator_write_emulated_onepage(unsigned long addr,
2176                                            const void *val,
2177                                            unsigned int bytes,
2178                                            struct kvm_vcpu *vcpu)
2179 {
2180         struct kvm_io_device *mmio_dev;
2181         gpa_t                 gpa;
2182
2183         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2184
2185         if (gpa == UNMAPPED_GVA) {
2186                 kvm_inject_page_fault(vcpu, addr, 2);
2187                 return X86EMUL_PROPAGATE_FAULT;
2188         }
2189
2190         /* For APIC access vmexit */
2191         if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2192                 goto mmio;
2193
2194         if (emulator_write_phys(vcpu, gpa, val, bytes))
2195                 return X86EMUL_CONTINUE;
2196
2197 mmio:
2198         /*
2199          * Is this MMIO handled locally?
2200          */
2201         mutex_lock(&vcpu->kvm->lock);
2202         mmio_dev = vcpu_find_mmio_dev(vcpu, gpa, bytes, 1);
2203         if (mmio_dev) {
2204                 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
2205                 mutex_unlock(&vcpu->kvm->lock);
2206                 return X86EMUL_CONTINUE;
2207         }
2208         mutex_unlock(&vcpu->kvm->lock);
2209
2210         vcpu->mmio_needed = 1;
2211         vcpu->mmio_phys_addr = gpa;
2212         vcpu->mmio_size = bytes;
2213         vcpu->mmio_is_write = 1;
2214         memcpy(vcpu->mmio_data, val, bytes);
2215
2216         return X86EMUL_CONTINUE;
2217 }
2218
2219 int emulator_write_emulated(unsigned long addr,
2220                                    const void *val,
2221                                    unsigned int bytes,
2222                                    struct kvm_vcpu *vcpu)
2223 {
2224         /* Crossing a page boundary? */
2225         if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
2226                 int rc, now;
2227
2228                 now = -addr & ~PAGE_MASK;
2229                 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
2230                 if (rc != X86EMUL_CONTINUE)
2231                         return rc;
2232                 addr += now;
2233                 val += now;
2234                 bytes -= now;
2235         }
2236         return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
2237 }
2238 EXPORT_SYMBOL_GPL(emulator_write_emulated);
2239
2240 static int emulator_cmpxchg_emulated(unsigned long addr,
2241                                      const void *old,
2242                                      const void *new,
2243                                      unsigned int bytes,
2244                                      struct kvm_vcpu *vcpu)
2245 {
2246         static int reported;
2247
2248         if (!reported) {
2249                 reported = 1;
2250                 printk(KERN_WARNING "kvm: emulating exchange as write\n");
2251         }
2252 #ifndef CONFIG_X86_64
2253         /* guests cmpxchg8b have to be emulated atomically */
2254         if (bytes == 8) {
2255                 gpa_t gpa;
2256                 struct page *page;
2257                 char *kaddr;
2258                 u64 val;
2259
2260                 gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, addr);
2261
2262                 if (gpa == UNMAPPED_GVA ||
2263                    (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
2264                         goto emul_write;
2265
2266                 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
2267                         goto emul_write;
2268
2269                 val = *(u64 *)new;
2270
2271                 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
2272
2273                 kaddr = kmap_atomic(page, KM_USER0);
2274                 set_64bit((u64 *)(kaddr + offset_in_page(gpa)), val);
2275                 kunmap_atomic(kaddr, KM_USER0);
2276                 kvm_release_page_dirty(page);
2277         }
2278 emul_write:
2279 #endif
2280
2281         return emulator_write_emulated(addr, new, bytes, vcpu);
2282 }
2283
2284 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
2285 {
2286         return kvm_x86_ops->get_segment_base(vcpu, seg);
2287 }
2288
2289 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
2290 {
2291         kvm_mmu_invlpg(vcpu, address);
2292         return X86EMUL_CONTINUE;
2293 }
2294
2295 int emulate_clts(struct kvm_vcpu *vcpu)
2296 {
2297         KVMTRACE_0D(CLTS, vcpu, handler);
2298         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 & ~X86_CR0_TS);
2299         return X86EMUL_CONTINUE;
2300 }
2301
2302 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
2303 {
2304         struct kvm_vcpu *vcpu = ctxt->vcpu;
2305
2306         switch (dr) {
2307         case 0 ... 3:
2308                 *dest = kvm_x86_ops->get_dr(vcpu, dr);
2309                 return X86EMUL_CONTINUE;
2310         default:
2311                 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __func__, dr);
2312                 return X86EMUL_UNHANDLEABLE;
2313         }
2314 }
2315
2316 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
2317 {
2318         unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
2319         int exception;
2320
2321         kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
2322         if (exception) {
2323                 /* FIXME: better handling */
2324                 return X86EMUL_UNHANDLEABLE;
2325         }
2326         return X86EMUL_CONTINUE;
2327 }
2328
2329 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
2330 {
2331         u8 opcodes[4];
2332         unsigned long rip = kvm_rip_read(vcpu);
2333         unsigned long rip_linear;
2334
2335         if (!printk_ratelimit())
2336                 return;
2337
2338         rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
2339
2340         kvm_read_guest_virt(rip_linear, (void *)opcodes, 4, vcpu);
2341
2342         printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
2343                context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
2344 }
2345 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
2346
2347 static struct x86_emulate_ops emulate_ops = {
2348         .read_std            = kvm_read_guest_virt,
2349         .read_emulated       = emulator_read_emulated,
2350         .write_emulated      = emulator_write_emulated,
2351         .cmpxchg_emulated    = emulator_cmpxchg_emulated,
2352 };
2353
2354 static void cache_all_regs(struct kvm_vcpu *vcpu)
2355 {
2356         kvm_register_read(vcpu, VCPU_REGS_RAX);
2357         kvm_register_read(vcpu, VCPU_REGS_RSP);
2358         kvm_register_read(vcpu, VCPU_REGS_RIP);
2359         vcpu->arch.regs_dirty = ~0;
2360 }
2361
2362 int emulate_instruction(struct kvm_vcpu *vcpu,
2363                         struct kvm_run *run,
2364                         unsigned long cr2,
2365                         u16 error_code,
2366                         int emulation_type)
2367 {
2368         int r;
2369         struct decode_cache *c;
2370
2371         kvm_clear_exception_queue(vcpu);
2372         vcpu->arch.mmio_fault_cr2 = cr2;
2373         /*
2374          * TODO: fix x86_emulate.c to use guest_read/write_register
2375          * instead of direct ->regs accesses, can save hundred cycles
2376          * on Intel for instructions that don't read/change RSP, for
2377          * for example.
2378          */
2379         cache_all_regs(vcpu);
2380
2381         vcpu->mmio_is_write = 0;
2382         vcpu->arch.pio.string = 0;
2383
2384         if (!(emulation_type & EMULTYPE_NO_DECODE)) {
2385                 int cs_db, cs_l;
2386                 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
2387
2388                 vcpu->arch.emulate_ctxt.vcpu = vcpu;
2389                 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
2390                 vcpu->arch.emulate_ctxt.mode =
2391                         (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
2392                         ? X86EMUL_MODE_REAL : cs_l
2393                         ? X86EMUL_MODE_PROT64 : cs_db
2394                         ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
2395
2396                 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2397
2398                 /* Reject the instructions other than VMCALL/VMMCALL when
2399                  * try to emulate invalid opcode */
2400                 c = &vcpu->arch.emulate_ctxt.decode;
2401                 if ((emulation_type & EMULTYPE_TRAP_UD) &&
2402                     (!(c->twobyte && c->b == 0x01 &&
2403                       (c->modrm_reg == 0 || c->modrm_reg == 3) &&
2404                        c->modrm_mod == 3 && c->modrm_rm == 1)))
2405                         return EMULATE_FAIL;
2406
2407                 ++vcpu->stat.insn_emulation;
2408                 if (r)  {
2409                         ++vcpu->stat.insn_emulation_fail;
2410                         if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2411                                 return EMULATE_DONE;
2412                         return EMULATE_FAIL;
2413                 }
2414         }
2415
2416         r = x86_emulate_insn(&vcpu->arch.emulate_ctxt, &emulate_ops);
2417
2418         if (vcpu->arch.pio.string)
2419                 return EMULATE_DO_MMIO;
2420
2421         if ((r || vcpu->mmio_is_write) && run) {
2422                 run->exit_reason = KVM_EXIT_MMIO;
2423                 run->mmio.phys_addr = vcpu->mmio_phys_addr;
2424                 memcpy(run->mmio.data, vcpu->mmio_data, 8);
2425                 run->mmio.len = vcpu->mmio_size;
2426                 run->mmio.is_write = vcpu->mmio_is_write;
2427         }
2428
2429         if (r) {
2430                 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
2431                         return EMULATE_DONE;
2432                 if (!vcpu->mmio_needed) {
2433                         kvm_report_emulation_failure(vcpu, "mmio");
2434                         return EMULATE_FAIL;
2435                 }
2436                 return EMULATE_DO_MMIO;
2437         }
2438
2439         kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
2440
2441         if (vcpu->mmio_is_write) {
2442                 vcpu->mmio_needed = 0;
2443                 return EMULATE_DO_MMIO;
2444         }
2445
2446         return EMULATE_DONE;
2447 }
2448 EXPORT_SYMBOL_GPL(emulate_instruction);
2449
2450 static int pio_copy_data(struct kvm_vcpu *vcpu)
2451 {
2452         void *p = vcpu->arch.pio_data;
2453         gva_t q = vcpu->arch.pio.guest_gva;
2454         unsigned bytes;
2455         int ret;
2456
2457         bytes = vcpu->arch.pio.size * vcpu->arch.pio.cur_count;
2458         if (vcpu->arch.pio.in)
2459                 ret = kvm_write_guest_virt(q, p, bytes, vcpu);
2460         else
2461                 ret = kvm_read_guest_virt(q, p, bytes, vcpu);
2462         return ret;
2463 }
2464
2465 int complete_pio(struct kvm_vcpu *vcpu)
2466 {
2467         struct kvm_pio_request *io = &vcpu->arch.pio;
2468         long delta;
2469         int r;
2470         unsigned long val;
2471
2472         if (!io->string) {
2473                 if (io->in) {
2474                         val = kvm_register_read(vcpu, VCPU_REGS_RAX);
2475                         memcpy(&val, vcpu->arch.pio_data, io->size);
2476                         kvm_register_write(vcpu, VCPU_REGS_RAX, val);
2477                 }
2478         } else {
2479                 if (io->in) {
2480                         r = pio_copy_data(vcpu);
2481                         if (r)
2482                                 return r;
2483                 }
2484
2485                 delta = 1;
2486                 if (io->rep) {
2487                         delta *= io->cur_count;
2488                         /*
2489                          * The size of the register should really depend on
2490                          * current address size.
2491                          */
2492                         val = kvm_register_read(vcpu, VCPU_REGS_RCX);
2493                         val -= delta;
2494                         kvm_register_write(vcpu, VCPU_REGS_RCX, val);
2495                 }
2496                 if (io->down)
2497                         delta = -delta;
2498                 delta *= io->size;
2499                 if (io->in) {
2500                         val = kvm_register_read(vcpu, VCPU_REGS_RDI);
2501                         val += delta;
2502                         kvm_register_write(vcpu, VCPU_REGS_RDI, val);
2503                 } else {
2504                         val = kvm_register_read(vcpu, VCPU_REGS_RSI);
2505                         val += delta;
2506                         kvm_register_write(vcpu, VCPU_REGS_RSI, val);
2507                 }
2508         }
2509
2510         io->count -= io->cur_count;
2511         io->cur_count = 0;
2512
2513         return 0;
2514 }
2515
2516 static void kernel_pio(struct kvm_io_device *pio_dev,
2517                        struct kvm_vcpu *vcpu,
2518                        void *pd)
2519 {
2520         /* TODO: String I/O for in kernel device */
2521
2522         mutex_lock(&vcpu->kvm->lock);
2523         if (vcpu->arch.pio.in)
2524                 kvm_iodevice_read(pio_dev, vcpu->arch.pio.port,
2525                                   vcpu->arch.pio.size,
2526                                   pd);
2527         else
2528                 kvm_iodevice_write(pio_dev, vcpu->arch.pio.port,
2529                                    vcpu->arch.pio.size,
2530                                    pd);
2531         mutex_unlock(&vcpu->kvm->lock);
2532 }
2533
2534 static void pio_string_write(struct kvm_io_device *pio_dev,
2535                              struct kvm_vcpu *vcpu)
2536 {
2537         struct kvm_pio_request *io = &vcpu->arch.pio;
2538         void *pd = vcpu->arch.pio_data;
2539         int i;
2540
2541         mutex_lock(&vcpu->kvm->lock);
2542         for (i = 0; i < io->cur_count; i++) {
2543                 kvm_iodevice_write(pio_dev, io->port,
2544                                    io->size,
2545                                    pd);
2546                 pd += io->size;
2547         }
2548         mutex_unlock(&vcpu->kvm->lock);
2549 }
2550
2551 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
2552                                                gpa_t addr, int len,
2553                                                int is_write)
2554 {
2555         return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr, len, is_write);
2556 }
2557
2558 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2559                   int size, unsigned port)
2560 {
2561         struct kvm_io_device *pio_dev;
2562         unsigned long val;
2563
2564         vcpu->run->exit_reason = KVM_EXIT_IO;
2565         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2566         vcpu->run->io.size = vcpu->arch.pio.size = size;
2567         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2568         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = 1;
2569         vcpu->run->io.port = vcpu->arch.pio.port = port;
2570         vcpu->arch.pio.in = in;
2571         vcpu->arch.pio.string = 0;
2572         vcpu->arch.pio.down = 0;
2573         vcpu->arch.pio.rep = 0;
2574
2575         if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2576                 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2577                             handler);
2578         else
2579                 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2580                             handler);
2581
2582         val = kvm_register_read(vcpu, VCPU_REGS_RAX);
2583         memcpy(vcpu->arch.pio_data, &val, 4);
2584
2585         pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);
2586         if (pio_dev) {
2587                 kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);
2588                 complete_pio(vcpu);
2589                 return 1;
2590         }
2591         return 0;
2592 }
2593 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
2594
2595 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
2596                   int size, unsigned long count, int down,
2597                   gva_t address, int rep, unsigned port)
2598 {
2599         unsigned now, in_page;
2600         int ret = 0;
2601         struct kvm_io_device *pio_dev;
2602
2603         vcpu->run->exit_reason = KVM_EXIT_IO;
2604         vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
2605         vcpu->run->io.size = vcpu->arch.pio.size = size;
2606         vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
2607         vcpu->run->io.count = vcpu->arch.pio.count = vcpu->arch.pio.cur_count = count;
2608         vcpu->run->io.port = vcpu->arch.pio.port = port;
2609         vcpu->arch.pio.in = in;
2610         vcpu->arch.pio.string = 1;
2611         vcpu->arch.pio.down = down;
2612         vcpu->arch.pio.rep = rep;
2613
2614         if (vcpu->run->io.direction == KVM_EXIT_IO_IN)
2615                 KVMTRACE_2D(IO_READ, vcpu, vcpu->run->io.port, (u32)size,
2616                             handler);
2617         else
2618                 KVMTRACE_2D(IO_WRITE, vcpu, vcpu->run->io.port, (u32)size,
2619                             handler);
2620
2621         if (!count) {
2622                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2623                 return 1;
2624         }
2625
2626         if (!down)
2627                 in_page = PAGE_SIZE - offset_in_page(address);
2628         else
2629                 in_page = offset_in_page(address) + size;
2630         now = min(count, (unsigned long)in_page / size);
2631         if (!now)
2632                 now = 1;
2633         if (down) {
2634                 /*
2635                  * String I/O in reverse.  Yuck.  Kill the guest, fix later.
2636                  */
2637                 pr_unimpl(vcpu, "guest string pio down\n");
2638                 kvm_inject_gp(vcpu, 0);
2639                 return 1;
2640         }
2641         vcpu->run->io.count = now;
2642         vcpu->arch.pio.cur_count = now;
2643
2644         if (vcpu->arch.pio.cur_count == vcpu->arch.pio.count)
2645                 kvm_x86_ops->skip_emulated_instruction(vcpu);
2646
2647         vcpu->arch.pio.guest_gva = address;
2648
2649         pio_dev = vcpu_find_pio_dev(vcpu, port,
2650                                     vcpu->arch.pio.cur_count,
2651                                     !vcpu->arch.pio.in);
2652         if (!vcpu->arch.pio.in) {
2653                 /* string PIO write */
2654                 ret = pio_copy_data(vcpu);
2655                 if (ret == X86EMUL_PROPAGATE_FAULT) {
2656                         kvm_inject_gp(vcpu, 0);
2657                         return 1;
2658                 }
2659                 if (ret == 0 && pio_dev) {
2660                         pio_string_write(pio_dev, vcpu);
2661                         complete_pio(vcpu);
2662                         if (vcpu->arch.pio.count == 0)
2663                                 ret = 1;
2664                 }
2665         } else if (pio_dev)
2666                 pr_unimpl(vcpu, "no string pio read support yet, "
2667                        "port %x size %d count %ld\n",
2668                         port, size, count);
2669
2670         return ret;
2671 }
2672 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2673
2674 static void bounce_off(void *info)
2675 {
2676         /* nothing */
2677 }
2678
2679 static unsigned int  ref_freq;
2680 static unsigned long tsc_khz_ref;
2681
2682 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
2683                                      void *data)
2684 {
2685         struct cpufreq_freqs *freq = data;
2686         struct kvm *kvm;
2687         struct kvm_vcpu *vcpu;
2688         int i, send_ipi = 0;
2689
2690         if (!ref_freq)
2691                 ref_freq = freq->old;
2692
2693         if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
2694                 return 0;
2695         if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
2696                 return 0;
2697         per_cpu(cpu_tsc_khz, freq->cpu) = cpufreq_scale(tsc_khz_ref, ref_freq, freq->new);
2698
2699         spin_lock(&kvm_lock);
2700         list_for_each_entry(kvm, &vm_list, vm_list) {
2701                 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2702                         vcpu = kvm->vcpus[i];
2703                         if (!vcpu)
2704                                 continue;
2705                         if (vcpu->cpu != freq->cpu)
2706                                 continue;
2707                         if (!kvm_request_guest_time_update(vcpu))
2708                                 continue;
2709                         if (vcpu->cpu != smp_processor_id())
2710                                 send_ipi++;
2711                 }
2712         }
2713         spin_unlock(&kvm_lock);
2714
2715         if (freq->old < freq->new && send_ipi) {
2716                 /*
2717                  * We upscale the frequency.  Must make the guest
2718                  * doesn't see old kvmclock values while running with
2719                  * the new frequency, otherwise we risk the guest sees
2720                  * time go backwards.
2721                  *
2722                  * In case we update the frequency for another cpu
2723                  * (which might be in guest context) send an interrupt
2724                  * to kick the cpu out of guest context.  Next time
2725                  * guest context is entered kvmclock will be updated,
2726                  * so the guest will not see stale values.
2727                  */
2728                 smp_call_function_single(freq->cpu, bounce_off, NULL, 1);
2729         }
2730         return 0;
2731 }
2732
2733 static struct notifier_block kvmclock_cpufreq_notifier_block = {
2734         .notifier_call  = kvmclock_cpufreq_notifier
2735 };
2736
2737 int kvm_arch_init(void *opaque)
2738 {
2739         int r, cpu;
2740         struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2741
2742         if (kvm_x86_ops) {
2743                 printk(KERN_ERR "kvm: already loaded the other module\n");
2744                 r = -EEXIST;
2745                 goto out;
2746         }
2747
2748         if (!ops->cpu_has_kvm_support()) {
2749                 printk(KERN_ERR "kvm: no hardware support\n");
2750                 r = -EOPNOTSUPP;
2751                 goto out;
2752         }
2753         if (ops->disabled_by_bios()) {
2754                 printk(KERN_ERR "kvm: disabled by bios\n");
2755                 r = -EOPNOTSUPP;
2756                 goto out;
2757         }
2758
2759         r = kvm_mmu_module_init();
2760         if (r)
2761                 goto out;
2762
2763         kvm_init_msr_list();
2764
2765         kvm_x86_ops = ops;
2766         kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2767         kvm_mmu_set_base_ptes(PT_PRESENT_MASK);
2768         kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
2769                         PT_DIRTY_MASK, PT64_NX_MASK, 0, 0);
2770
2771         for_each_possible_cpu(cpu)
2772                 per_cpu(cpu_tsc_khz, cpu) = tsc_khz;
2773         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
2774                 tsc_khz_ref = tsc_khz;
2775                 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
2776                                           CPUFREQ_TRANSITION_NOTIFIER);
2777         }
2778
2779         return 0;
2780
2781 out:
2782         return r;
2783 }
2784
2785 void kvm_arch_exit(void)
2786 {
2787         if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
2788                 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
2789                                             CPUFREQ_TRANSITION_NOTIFIER);
2790         kvm_x86_ops = NULL;
2791         kvm_mmu_module_exit();
2792 }
2793
2794 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2795 {
2796         ++vcpu->stat.halt_exits;
2797         KVMTRACE_0D(HLT, vcpu, handler);
2798         if (irqchip_in_kernel(vcpu->kvm)) {
2799                 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
2800                 return 1;
2801         } else {
2802                 vcpu->run->exit_reason = KVM_EXIT_HLT;
2803                 return 0;
2804         }
2805 }
2806 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2807
2808 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
2809                            unsigned long a1)
2810 {
2811         if (is_long_mode(vcpu))
2812                 return a0;
2813         else
2814                 return a0 | ((gpa_t)a1 << 32);
2815 }
2816
2817 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2818 {
2819         unsigned long nr, a0, a1, a2, a3, ret;
2820         int r = 1;
2821
2822         nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
2823         a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
2824         a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
2825         a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
2826         a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
2827
2828         KVMTRACE_1D(VMMCALL, vcpu, (u32)nr, handler);
2829
2830         if (!is_long_mode(vcpu)) {
2831                 nr &= 0xFFFFFFFF;
2832                 a0 &= 0xFFFFFFFF;
2833                 a1 &= 0xFFFFFFFF;
2834                 a2 &= 0xFFFFFFFF;
2835                 a3 &= 0xFFFFFFFF;
2836         }
2837
2838         switch (nr) {
2839         case KVM_HC_VAPIC_POLL_IRQ:
2840                 ret = 0;
2841                 break;
2842         case KVM_HC_MMU_OP:
2843                 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
2844                 break;
2845         default:
2846                 ret = -KVM_ENOSYS;
2847                 break;
2848         }
2849         kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
2850         ++vcpu->stat.hypercalls;
2851         return r;
2852 }
2853 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2854
2855 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2856 {
2857         char instruction[3];
2858         int ret = 0;
2859         unsigned long rip = kvm_rip_read(vcpu);
2860
2861
2862         /*
2863          * Blow out the MMU to ensure that no other VCPU has an active mapping
2864          * to ensure that the updated hypercall appears atomically across all
2865          * VCPUs.
2866          */
2867         kvm_mmu_zap_all(vcpu->kvm);
2868
2869         kvm_x86_ops->patch_hypercall(vcpu, instruction);
2870         if (emulator_write_emulated(rip, instruction, 3, vcpu)
2871             != X86EMUL_CONTINUE)
2872                 ret = -EFAULT;
2873
2874         return ret;
2875 }
2876
2877 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2878 {
2879         return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2880 }
2881
2882 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2883 {
2884         struct descriptor_table dt = { limit, base };
2885
2886         kvm_x86_ops->set_gdt(vcpu, &dt);
2887 }
2888
2889 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2890 {
2891         struct descriptor_table dt = { limit, base };
2892
2893         kvm_x86_ops->set_idt(vcpu, &dt);
2894 }
2895
2896 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2897                    unsigned long *rflags)
2898 {
2899         kvm_lmsw(vcpu, msw);
2900         *rflags = kvm_x86_ops->get_rflags(vcpu);
2901 }
2902
2903 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2904 {
2905         unsigned long value;
2906
2907         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2908         switch (cr) {
2909         case 0:
2910                 value = vcpu->arch.cr0;
2911                 break;
2912         case 2:
2913                 value = vcpu->arch.cr2;
2914                 break;
2915         case 3:
2916                 value = vcpu->arch.cr3;
2917                 break;
2918         case 4:
2919                 value = vcpu->arch.cr4;
2920                 break;
2921         case 8:
2922                 value = kvm_get_cr8(vcpu);
2923                 break;
2924         default:
2925                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2926                 return 0;
2927         }
2928         KVMTRACE_3D(CR_READ, vcpu, (u32)cr, (u32)value,
2929                     (u32)((u64)value >> 32), handler);
2930
2931         return value;
2932 }
2933
2934 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2935                      unsigned long *rflags)
2936 {
2937         KVMTRACE_3D(CR_WRITE, vcpu, (u32)cr, (u32)val,
2938                     (u32)((u64)val >> 32), handler);
2939
2940         switch (cr) {
2941         case 0:
2942                 kvm_set_cr0(vcpu, mk_cr_64(vcpu->arch.cr0, val));
2943                 *rflags = kvm_x86_ops->get_rflags(vcpu);
2944                 break;
2945         case 2:
2946                 vcpu->arch.cr2 = val;
2947                 break;
2948         case 3:
2949                 kvm_set_cr3(vcpu, val);
2950                 break;
2951         case 4:
2952                 kvm_set_cr4(vcpu, mk_cr_64(vcpu->arch.cr4, val));
2953                 break;
2954         case 8:
2955                 kvm_set_cr8(vcpu, val & 0xfUL);
2956                 break;
2957         default:
2958                 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
2959         }
2960 }
2961
2962 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2963 {
2964         struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
2965         int j, nent = vcpu->arch.cpuid_nent;
2966
2967         e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2968         /* when no next entry is found, the current entry[i] is reselected */
2969         for (j = i + 1; ; j = (j + 1) % nent) {
2970                 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
2971                 if (ej->function == e->function) {
2972                         ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2973                         return j;
2974                 }
2975         }
2976         return 0; /* silence gcc, even though control never reaches here */
2977 }
2978
2979 /* find an entry with matching function, matching index (if needed), and that
2980  * should be read next (if it's stateful) */
2981 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2982         u32 function, u32 index)
2983 {
2984         if (e->function != function)
2985                 return 0;
2986         if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2987                 return 0;
2988         if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2989             !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2990                 return 0;
2991         return 1;
2992 }
2993
2994 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
2995                                               u32 function, u32 index)
2996 {
2997         int i;
2998         struct kvm_cpuid_entry2 *best = NULL;
2999
3000         for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
3001                 struct kvm_cpuid_entry2 *e;
3002
3003                 e = &vcpu->arch.cpuid_entries[i];
3004                 if (is_matching_cpuid_entry(e, function, index)) {
3005                         if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
3006                                 move_to_next_stateful_cpuid_entry(vcpu, i);
3007                         best = e;
3008                         break;
3009                 }
3010                 /*
3011                  * Both basic or both extended?
3012                  */
3013                 if (((e->function ^ function) & 0x80000000) == 0)
3014                         if (!best || e->function > best->function)
3015                                 best = e;
3016         }
3017         return best;
3018 }
3019
3020 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
3021 {
3022         u32 function, index;
3023         struct kvm_cpuid_entry2 *best;
3024
3025         function = kvm_register_read(vcpu, VCPU_REGS_RAX);
3026         index = kvm_register_read(vcpu, VCPU_REGS_RCX);
3027         kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
3028         kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
3029         kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
3030         kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
3031         best = kvm_find_cpuid_entry(vcpu, function, index);
3032         if (best) {
3033                 kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
3034                 kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
3035                 kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
3036                 kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
3037         }
3038         kvm_x86_ops->skip_emulated_instruction(vcpu);
3039         KVMTRACE_5D(CPUID, vcpu, function,
3040                     (u32)kvm_register_read(vcpu, VCPU_REGS_RAX),
3041                     (u32)kvm_register_read(vcpu, VCPU_REGS_RBX),
3042                     (u32)kvm_register_read(vcpu, VCPU_REGS_RCX),
3043                     (u32)kvm_register_read(vcpu, VCPU_REGS_RDX), handler);
3044 }
3045 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
3046
3047 /*
3048  * Check if userspace requested an interrupt window, and that the
3049  * interrupt window is open.
3050  *
3051  * No need to exit to userspace if we already have an interrupt queued.
3052  */
3053 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
3054                                           struct kvm_run *kvm_run)
3055 {
3056         return (!vcpu->arch.irq_summary &&
3057                 kvm_run->request_interrupt_window &&
3058                 vcpu->arch.interrupt_window_open &&
3059                 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
3060 }
3061
3062 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
3063                               struct kvm_run *kvm_run)
3064 {
3065         kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
3066         kvm_run->cr8 = kvm_get_cr8(vcpu);
3067         kvm_run->apic_base = kvm_get_apic_base(vcpu);
3068         if (irqchip_in_kernel(vcpu->kvm))
3069                 kvm_run->ready_for_interrupt_injection = 1;
3070         else
3071                 kvm_run->ready_for_interrupt_injection =
3072                                         (vcpu->arch.interrupt_window_open &&
3073                                          vcpu->arch.irq_summary == 0);
3074 }
3075
3076 static void vapic_enter(struct kvm_vcpu *vcpu)
3077 {
3078         struct kvm_lapic *apic = vcpu->arch.apic;
3079         struct page *page;
3080
3081         if (!apic || !apic->vapic_addr)
3082                 return;
3083
3084         page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
3085
3086         vcpu->arch.apic->vapic_page = page;
3087 }
3088
3089 static void vapic_exit(struct kvm_vcpu *vcpu)
3090 {
3091         struct kvm_lapic *apic = vcpu->arch.apic;
3092
3093         if (!apic || !apic->vapic_addr)
3094                 return;
3095
3096         down_read(&vcpu->kvm->slots_lock);
3097         kvm_release_page_dirty(apic->vapic_page);
3098         mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
3099         up_read(&vcpu->kvm->slots_lock);
3100 }
3101
3102 static int vcpu_enter_guest(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3103 {
3104         int r;
3105
3106         if (vcpu->requests)
3107                 if (test_and_clear_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
3108                         kvm_mmu_unload(vcpu);
3109
3110         r = kvm_mmu_reload(vcpu);
3111         if (unlikely(r))
3112                 goto out;
3113
3114         if (vcpu->requests) {
3115                 if (test_and_clear_bit(KVM_REQ_MIGRATE_TIMER, &vcpu->requests))
3116                         __kvm_migrate_timers(vcpu);
3117                 if (test_and_clear_bit(KVM_REQ_KVMCLOCK_UPDATE, &vcpu->requests))
3118                         kvm_write_guest_time(vcpu);
3119                 if (test_and_clear_bit(KVM_REQ_MMU_SYNC, &vcpu->requests))
3120                         kvm_mmu_sync_roots(vcpu);
3121                 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
3122                         kvm_x86_ops->tlb_flush(vcpu);
3123                 if (test_and_clear_bit(KVM_REQ_REPORT_TPR_ACCESS,
3124                                        &vcpu->requests)) {
3125                         kvm_run->exit_reason = KVM_EXIT_TPR_ACCESS;
3126                         r = 0;
3127                         goto out;
3128                 }
3129                 if (test_and_clear_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests)) {
3130                         kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
3131                         r = 0;
3132                         goto out;
3133                 }
3134         }
3135
3136         clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
3137         kvm_inject_pending_timer_irqs(vcpu);
3138
3139         preempt_disable();
3140
3141         kvm_x86_ops->prepare_guest_switch(vcpu);
3142         kvm_load_guest_fpu(vcpu);
3143
3144         local_irq_disable();
3145
3146         if (vcpu->requests || need_resched() || signal_pending(current)) {
3147                 local_irq_enable();
3148                 preempt_enable();
3149                 r = 1;
3150                 goto out;
3151         }
3152
3153         vcpu->guest_mode = 1;
3154         /*
3155          * Make sure that guest_mode assignment won't happen after
3156          * testing the pending IRQ vector bitmap.
3157          */
3158         smp_wmb();
3159
3160         if (vcpu->arch.exception.pending)
3161                 __queue_exception(vcpu);
3162         else if (irqchip_in_kernel(vcpu->kvm))
3163                 kvm_x86_ops->inject_pending_irq(vcpu);
3164         else
3165                 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
3166
3167         kvm_lapic_sync_to_vapic(vcpu);
3168
3169         up_read(&vcpu->kvm->slots_lock);
3170
3171         kvm_guest_enter();
3172
3173         get_debugreg(vcpu->arch.host_dr6, 6);
3174         get_debugreg(vcpu->arch.host_dr7, 7);
3175         if (unlikely(vcpu->arch.switch_db_regs)) {
3176                 get_debugreg(vcpu->arch.host_db[0], 0);
3177                 get_debugreg(vcpu->arch.host_db[1], 1);
3178                 get_debugreg(vcpu->arch.host_db[2], 2);
3179                 get_debugreg(vcpu->arch.host_db[3], 3);
3180
3181                 set_debugreg(0, 7);
3182                 set_debugreg(vcpu->arch.eff_db[0], 0);
3183                 set_debugreg(vcpu->arch.eff_db[1], 1);
3184                 set_debugreg(vcpu->arch.eff_db[2], 2);
3185                 set_debugreg(vcpu->arch.eff_db[3], 3);
3186         }
3187
3188         KVMTRACE_0D(VMENTRY, vcpu, entryexit);
3189         kvm_x86_ops->run(vcpu, kvm_run);
3190
3191         if (unlikely(vcpu->arch.switch_db_regs)) {
3192                 set_debugreg(0, 7);
3193                 set_debugreg(vcpu->arch.host_db[0], 0);
3194                 set_debugreg(vcpu->arch.host_db[1], 1);
3195                 set_debugreg(vcpu->arch.host_db[2], 2);
3196                 set_debugreg(vcpu->arch.host_db[3], 3);
3197         }
3198         set_debugreg(vcpu->arch.host_dr6, 6);
3199         set_debugreg(vcpu->arch.host_dr7, 7);
3200
3201         vcpu->guest_mode = 0;
3202         local_irq_enable();
3203
3204         ++vcpu->stat.exits;
3205
3206         /*
3207          * We must have an instruction between local_irq_enable() and
3208          * kvm_guest_exit(), so the timer interrupt isn't delayed by
3209          * the interrupt shadow.  The stat.exits increment will do nicely.
3210          * But we need to prevent reordering, hence this barrier():
3211          */
3212         barrier();
3213
3214         kvm_guest_exit();
3215
3216         preempt_enable();
3217
3218         down_read(&vcpu->kvm->slots_lock);
3219
3220         /*
3221          * Profile KVM exit RIPs:
3222          */
3223         if (unlikely(prof_on == KVM_PROFILING)) {
3224                 unsigned long rip = kvm_rip_read(vcpu);
3225                 profile_hit(KVM_PROFILING, (void *)rip);
3226         }
3227
3228         if (vcpu->arch.exception.pending && kvm_x86_ops->exception_injected(vcpu))
3229                 vcpu->arch.exception.pending = false;
3230
3231         kvm_lapic_sync_from_vapic(vcpu);
3232
3233         r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
3234 out:
3235         return r;
3236 }
3237
3238 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3239 {
3240         int r;
3241
3242         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
3243                 pr_debug("vcpu %d received sipi with vector # %x\n",
3244                          vcpu->vcpu_id, vcpu->arch.sipi_vector);
3245                 kvm_lapic_reset(vcpu);
3246                 r = kvm_arch_vcpu_reset(vcpu);
3247                 if (r)
3248                         return r;
3249                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
3250         }
3251
3252         down_read(&vcpu->kvm->slots_lock);
3253         vapic_enter(vcpu);
3254
3255         r = 1;
3256         while (r > 0) {
3257                 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE)
3258                         r = vcpu_enter_guest(vcpu, kvm_run);
3259                 else {
3260                         up_read(&vcpu->kvm->slots_lock);
3261                         kvm_vcpu_block(vcpu);
3262                         down_read(&vcpu->kvm->slots_lock);
3263                         if (test_and_clear_bit(KVM_REQ_UNHALT, &vcpu->requests))
3264                                 if (vcpu->arch.mp_state == KVM_MP_STATE_HALTED)
3265                                         vcpu->arch.mp_state =
3266                                                         KVM_MP_STATE_RUNNABLE;
3267                         if (vcpu->arch.mp_state != KVM_MP_STATE_RUNNABLE)
3268                                 r = -EINTR;
3269                 }
3270
3271                 if (r > 0) {
3272                         if (dm_request_for_irq_injection(vcpu, kvm_run)) {
3273                                 r = -EINTR;
3274                                 kvm_run->exit_reason = KVM_EXIT_INTR;
3275                                 ++vcpu->stat.request_irq_exits;
3276                         }
3277                         if (signal_pending(current)) {
3278                                 r = -EINTR;
3279                                 kvm_run->exit_reason = KVM_EXIT_INTR;
3280                                 ++vcpu->stat.signal_exits;
3281                         }
3282                         if (need_resched()) {
3283                                 up_read(&vcpu->kvm->slots_lock);
3284                                 kvm_resched(vcpu);
3285                                 down_read(&vcpu->kvm->slots_lock);
3286                         }
3287                 }
3288         }
3289
3290         up_read(&vcpu->kvm->slots_lock);
3291         post_kvm_run_save(vcpu, kvm_run);
3292
3293         vapic_exit(vcpu);
3294
3295         return r;
3296 }
3297
3298 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
3299 {
3300         int r;
3301         sigset_t sigsaved;
3302
3303         vcpu_load(vcpu);
3304
3305         if (vcpu->sigset_active)
3306                 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
3307
3308         if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
3309                 kvm_vcpu_block(vcpu);
3310                 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
3311                 r = -EAGAIN;
3312                 goto out;
3313         }
3314
3315         /* re-sync apic's tpr */
3316         if (!irqchip_in_kernel(vcpu->kvm))
3317                 kvm_set_cr8(vcpu, kvm_run->cr8);
3318
3319         if (vcpu->arch.pio.cur_count) {
3320                 r = complete_pio(vcpu);
3321                 if (r)
3322                         goto out;
3323         }
3324 #if CONFIG_HAS_IOMEM
3325         if (vcpu->mmio_needed) {
3326                 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
3327                 vcpu->mmio_read_completed = 1;
3328                 vcpu->mmio_needed = 0;
3329
3330                 down_read(&vcpu->kvm->slots_lock);
3331                 r = emulate_instruction(vcpu, kvm_run,
3332                                         vcpu->arch.mmio_fault_cr2, 0,
3333                                         EMULTYPE_NO_DECODE);
3334                 up_read(&vcpu->kvm->slots_lock);
3335                 if (r == EMULATE_DO_MMIO) {
3336                         /*
3337                          * Read-modify-write.  Back to userspace.
3338                          */
3339                         r = 0;
3340                         goto out;
3341                 }
3342         }
3343 #endif
3344         if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
3345                 kvm_register_write(vcpu, VCPU_REGS_RAX,
3346                                      kvm_run->hypercall.ret);
3347
3348         r = __vcpu_run(vcpu, kvm_run);
3349
3350 out:
3351         if (vcpu->sigset_active)
3352                 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
3353
3354         vcpu_put(vcpu);
3355         return r;
3356 }
3357
3358 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3359 {
3360         vcpu_load(vcpu);
3361
3362         regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
3363         regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
3364         regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
3365         regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
3366         regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
3367         regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
3368         regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
3369         regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
3370 #ifdef CONFIG_X86_64
3371         regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
3372         regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
3373         regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
3374         regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
3375         regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
3376         regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
3377         regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
3378         regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
3379 #endif
3380
3381         regs->rip = kvm_rip_read(vcpu);
3382         regs->rflags = kvm_x86_ops->get_rflags(vcpu);
3383
3384         /*
3385          * Don't leak debug flags in case they were set for guest debugging
3386          */
3387         if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
3388                 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
3389
3390         vcpu_put(vcpu);
3391
3392         return 0;
3393 }
3394
3395 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
3396 {
3397         vcpu_load(vcpu);
3398
3399         kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
3400         kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
3401         kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
3402         kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
3403         kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
3404         kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
3405         kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
3406         kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
3407 #ifdef CONFIG_X86_64
3408         kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
3409         kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
3410         kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
3411         kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
3412         kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
3413         kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
3414         kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
3415         kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
3416
3417 #endif
3418
3419         kvm_rip_write(vcpu, regs->rip);
3420         kvm_x86_ops->set_rflags(vcpu, regs->rflags);
3421
3422
3423         vcpu->arch.exception.pending = false;
3424
3425         vcpu_put(vcpu);
3426
3427         return 0;
3428 }
3429
3430 void kvm_get_segment(struct kvm_vcpu *vcpu,
3431                      struct kvm_segment *var, int seg)
3432 {
3433         kvm_x86_ops->get_segment(vcpu, var, seg);
3434 }
3435
3436 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
3437 {
3438         struct kvm_segment cs;
3439
3440         kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
3441         *db = cs.db;
3442         *l = cs.l;
3443 }
3444 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
3445
3446 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
3447                                   struct kvm_sregs *sregs)
3448 {
3449         struct descriptor_table dt;
3450         int pending_vec;
3451
3452         vcpu_load(vcpu);
3453
3454         kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3455         kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3456         kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3457         kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3458         kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3459         kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3460
3461         kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3462         kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3463
3464         kvm_x86_ops->get_idt(vcpu, &dt);
3465         sregs->idt.limit = dt.limit;
3466         sregs->idt.base = dt.base;
3467         kvm_x86_ops->get_gdt(vcpu, &dt);
3468         sregs->gdt.limit = dt.limit;
3469         sregs->gdt.base = dt.base;
3470
3471         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3472         sregs->cr0 = vcpu->arch.cr0;
3473         sregs->cr2 = vcpu->arch.cr2;
3474         sregs->cr3 = vcpu->arch.cr3;
3475         sregs->cr4 = vcpu->arch.cr4;
3476         sregs->cr8 = kvm_get_cr8(vcpu);
3477         sregs->efer = vcpu->arch.shadow_efer;
3478         sregs->apic_base = kvm_get_apic_base(vcpu);
3479
3480         if (irqchip_in_kernel(vcpu->kvm)) {
3481                 memset(sregs->interrupt_bitmap, 0,
3482                        sizeof sregs->interrupt_bitmap);
3483                 pending_vec = kvm_x86_ops->get_irq(vcpu);
3484                 if (pending_vec >= 0)
3485                         set_bit(pending_vec,
3486                                 (unsigned long *)sregs->interrupt_bitmap);
3487         } else
3488                 memcpy(sregs->interrupt_bitmap, vcpu->arch.irq_pending,
3489                        sizeof sregs->interrupt_bitmap);
3490
3491         vcpu_put(vcpu);
3492
3493         return 0;
3494 }
3495
3496 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
3497                                     struct kvm_mp_state *mp_state)
3498 {
3499         vcpu_load(vcpu);
3500         mp_state->mp_state = vcpu->arch.mp_state;
3501         vcpu_put(vcpu);
3502         return 0;
3503 }
3504
3505 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
3506                                     struct kvm_mp_state *mp_state)
3507 {
3508         vcpu_load(vcpu);
3509         vcpu->arch.mp_state = mp_state->mp_state;
3510         vcpu_put(vcpu);
3511         return 0;
3512 }
3513
3514 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3515                         struct kvm_segment *var, int seg)
3516 {
3517         kvm_x86_ops->set_segment(vcpu, var, seg);
3518 }
3519
3520 static void seg_desct_to_kvm_desct(struct desc_struct *seg_desc, u16 selector,
3521                                    struct kvm_segment *kvm_desct)
3522 {
3523         kvm_desct->base = seg_desc->base0;
3524         kvm_desct->base |= seg_desc->base1 << 16;
3525         kvm_desct->base |= seg_desc->base2 << 24;
3526         kvm_desct->limit = seg_desc->limit0;
3527         kvm_desct->limit |= seg_desc->limit << 16;
3528         if (seg_desc->g) {
3529                 kvm_desct->limit <<= 12;
3530                 kvm_desct->limit |= 0xfff;
3531         }
3532         kvm_desct->selector = selector;
3533         kvm_desct->type = seg_desc->type;
3534         kvm_desct->present = seg_desc->p;
3535         kvm_desct->dpl = seg_desc->dpl;
3536         kvm_desct->db = seg_desc->d;
3537         kvm_desct->s = seg_desc->s;
3538         kvm_desct->l = seg_desc->l;
3539         kvm_desct->g = seg_desc->g;
3540         kvm_desct->avl = seg_desc->avl;
3541         if (!selector)
3542                 kvm_desct->unusable = 1;
3543         else
3544                 kvm_desct->unusable = 0;
3545         kvm_desct->padding = 0;
3546 }
3547
3548 static void get_segment_descriptor_dtable(struct kvm_vcpu *vcpu,
3549                                           u16 selector,
3550                                           struct descriptor_table *dtable)
3551 {
3552         if (selector & 1 << 2) {
3553                 struct kvm_segment kvm_seg;
3554
3555                 kvm_get_segment(vcpu, &kvm_seg, VCPU_SREG_LDTR);
3556
3557                 if (kvm_seg.unusable)
3558                         dtable->limit = 0;
3559                 else
3560                         dtable->limit = kvm_seg.limit;
3561                 dtable->base = kvm_seg.base;
3562         }
3563         else
3564                 kvm_x86_ops->get_gdt(vcpu, dtable);
3565 }
3566
3567 /* allowed just for 8 bytes segments */
3568 static int load_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3569                                          struct desc_struct *seg_desc)
3570 {
3571         gpa_t gpa;
3572         struct descriptor_table dtable;
3573         u16 index = selector >> 3;
3574
3575         get_segment_descriptor_dtable(vcpu, selector, &dtable);
3576
3577         if (dtable.limit < index * 8 + 7) {
3578                 kvm_queue_exception_e(vcpu, GP_VECTOR, selector & 0xfffc);
3579                 return 1;
3580         }
3581         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
3582         gpa += index * 8;
3583         return kvm_read_guest(vcpu->kvm, gpa, seg_desc, 8);
3584 }
3585
3586 /* allowed just for 8 bytes segments */
3587 static int save_guest_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3588                                          struct desc_struct *seg_desc)
3589 {
3590         gpa_t gpa;
3591         struct descriptor_table dtable;
3592         u16 index = selector >> 3;
3593
3594         get_segment_descriptor_dtable(vcpu, selector, &dtable);
3595
3596         if (dtable.limit < index * 8 + 7)
3597                 return 1;
3598         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, dtable.base);
3599         gpa += index * 8;
3600         return kvm_write_guest(vcpu->kvm, gpa, seg_desc, 8);
3601 }
3602
3603 static u32 get_tss_base_addr(struct kvm_vcpu *vcpu,
3604                              struct desc_struct *seg_desc)
3605 {
3606         u32 base_addr;
3607
3608         base_addr = seg_desc->base0;
3609         base_addr |= (seg_desc->base1 << 16);
3610         base_addr |= (seg_desc->base2 << 24);
3611
3612         return vcpu->arch.mmu.gva_to_gpa(vcpu, base_addr);
3613 }
3614
3615 static u16 get_segment_selector(struct kvm_vcpu *vcpu, int seg)
3616 {
3617         struct kvm_segment kvm_seg;
3618
3619         kvm_get_segment(vcpu, &kvm_seg, seg);
3620         return kvm_seg.selector;
3621 }
3622
3623 static int load_segment_descriptor_to_kvm_desct(struct kvm_vcpu *vcpu,
3624                                                 u16 selector,
3625                                                 struct kvm_segment *kvm_seg)
3626 {
3627         struct desc_struct seg_desc;
3628
3629         if (load_guest_segment_descriptor(vcpu, selector, &seg_desc))
3630                 return 1;
3631         seg_desct_to_kvm_desct(&seg_desc, selector, kvm_seg);
3632         return 0;
3633 }
3634
3635 static int kvm_load_realmode_segment(struct kvm_vcpu *vcpu, u16 selector, int seg)
3636 {
3637         struct kvm_segment segvar = {
3638                 .base = selector << 4,
3639                 .limit = 0xffff,
3640                 .selector = selector,
3641                 .type = 3,
3642                 .present = 1,
3643                 .dpl = 3,
3644                 .db = 0,
3645                 .s = 1,
3646                 .l = 0,
3647                 .g = 0,
3648                 .avl = 0,
3649                 .unusable = 0,
3650         };
3651         kvm_x86_ops->set_segment(vcpu, &segvar, seg);
3652         return 0;
3653 }
3654
3655 int kvm_load_segment_descriptor(struct kvm_vcpu *vcpu, u16 selector,
3656                                 int type_bits, int seg)
3657 {
3658         struct kvm_segment kvm_seg;
3659
3660         if (!(vcpu->arch.cr0 & X86_CR0_PE))
3661                 return kvm_load_realmode_segment(vcpu, selector, seg);
3662         if (load_segment_descriptor_to_kvm_desct(vcpu, selector, &kvm_seg))
3663                 return 1;
3664         kvm_seg.type |= type_bits;
3665
3666         if (seg != VCPU_SREG_SS && seg != VCPU_SREG_CS &&
3667             seg != VCPU_SREG_LDTR)
3668                 if (!kvm_seg.s)
3669                         kvm_seg.unusable = 1;
3670
3671         kvm_set_segment(vcpu, &kvm_seg, seg);
3672         return 0;
3673 }
3674
3675 static void save_state_to_tss32(struct kvm_vcpu *vcpu,
3676                                 struct tss_segment_32 *tss)
3677 {
3678         tss->cr3 = vcpu->arch.cr3;
3679         tss->eip = kvm_rip_read(vcpu);
3680         tss->eflags = kvm_x86_ops->get_rflags(vcpu);
3681         tss->eax = kvm_register_read(vcpu, VCPU_REGS_RAX);
3682         tss->ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
3683         tss->edx = kvm_register_read(vcpu, VCPU_REGS_RDX);
3684         tss->ebx = kvm_register_read(vcpu, VCPU_REGS_RBX);
3685         tss->esp = kvm_register_read(vcpu, VCPU_REGS_RSP);
3686         tss->ebp = kvm_register_read(vcpu, VCPU_REGS_RBP);
3687         tss->esi = kvm_register_read(vcpu, VCPU_REGS_RSI);
3688         tss->edi = kvm_register_read(vcpu, VCPU_REGS_RDI);
3689         tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3690         tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3691         tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3692         tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3693         tss->fs = get_segment_selector(vcpu, VCPU_SREG_FS);
3694         tss->gs = get_segment_selector(vcpu, VCPU_SREG_GS);
3695         tss->ldt_selector = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3696         tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3697 }
3698
3699 static int load_state_from_tss32(struct kvm_vcpu *vcpu,
3700                                   struct tss_segment_32 *tss)
3701 {
3702         kvm_set_cr3(vcpu, tss->cr3);
3703
3704         kvm_rip_write(vcpu, tss->eip);
3705         kvm_x86_ops->set_rflags(vcpu, tss->eflags | 2);
3706
3707         kvm_register_write(vcpu, VCPU_REGS_RAX, tss->eax);
3708         kvm_register_write(vcpu, VCPU_REGS_RCX, tss->ecx);
3709         kvm_register_write(vcpu, VCPU_REGS_RDX, tss->edx);
3710         kvm_register_write(vcpu, VCPU_REGS_RBX, tss->ebx);
3711         kvm_register_write(vcpu, VCPU_REGS_RSP, tss->esp);
3712         kvm_register_write(vcpu, VCPU_REGS_RBP, tss->ebp);
3713         kvm_register_write(vcpu, VCPU_REGS_RSI, tss->esi);
3714         kvm_register_write(vcpu, VCPU_REGS_RDI, tss->edi);
3715
3716         if (kvm_load_segment_descriptor(vcpu, tss->ldt_selector, 0, VCPU_SREG_LDTR))
3717                 return 1;
3718
3719         if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3720                 return 1;
3721
3722         if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3723                 return 1;
3724
3725         if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3726                 return 1;
3727
3728         if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3729                 return 1;
3730
3731         if (kvm_load_segment_descriptor(vcpu, tss->fs, 1, VCPU_SREG_FS))
3732                 return 1;
3733
3734         if (kvm_load_segment_descriptor(vcpu, tss->gs, 1, VCPU_SREG_GS))
3735                 return 1;
3736         return 0;
3737 }
3738
3739 static void save_state_to_tss16(struct kvm_vcpu *vcpu,
3740                                 struct tss_segment_16 *tss)
3741 {
3742         tss->ip = kvm_rip_read(vcpu);
3743         tss->flag = kvm_x86_ops->get_rflags(vcpu);
3744         tss->ax = kvm_register_read(vcpu, VCPU_REGS_RAX);
3745         tss->cx = kvm_register_read(vcpu, VCPU_REGS_RCX);
3746         tss->dx = kvm_register_read(vcpu, VCPU_REGS_RDX);
3747         tss->bx = kvm_register_read(vcpu, VCPU_REGS_RBX);
3748         tss->sp = kvm_register_read(vcpu, VCPU_REGS_RSP);
3749         tss->bp = kvm_register_read(vcpu, VCPU_REGS_RBP);
3750         tss->si = kvm_register_read(vcpu, VCPU_REGS_RSI);
3751         tss->di = kvm_register_read(vcpu, VCPU_REGS_RDI);
3752
3753         tss->es = get_segment_selector(vcpu, VCPU_SREG_ES);
3754         tss->cs = get_segment_selector(vcpu, VCPU_SREG_CS);
3755         tss->ss = get_segment_selector(vcpu, VCPU_SREG_SS);
3756         tss->ds = get_segment_selector(vcpu, VCPU_SREG_DS);
3757         tss->ldt = get_segment_selector(vcpu, VCPU_SREG_LDTR);
3758         tss->prev_task_link = get_segment_selector(vcpu, VCPU_SREG_TR);
3759 }
3760
3761 static int load_state_from_tss16(struct kvm_vcpu *vcpu,
3762                                  struct tss_segment_16 *tss)
3763 {
3764         kvm_rip_write(vcpu, tss->ip);
3765         kvm_x86_ops->set_rflags(vcpu, tss->flag | 2);
3766         kvm_register_write(vcpu, VCPU_REGS_RAX, tss->ax);
3767         kvm_register_write(vcpu, VCPU_REGS_RCX, tss->cx);
3768         kvm_register_write(vcpu, VCPU_REGS_RDX, tss->dx);
3769         kvm_register_write(vcpu, VCPU_REGS_RBX, tss->bx);
3770         kvm_register_write(vcpu, VCPU_REGS_RSP, tss->sp);
3771         kvm_register_write(vcpu, VCPU_REGS_RBP, tss->bp);
3772         kvm_register_write(vcpu, VCPU_REGS_RSI, tss->si);
3773         kvm_register_write(vcpu, VCPU_REGS_RDI, tss->di);
3774
3775         if (kvm_load_segment_descriptor(vcpu, tss->ldt, 0, VCPU_SREG_LDTR))
3776                 return 1;
3777
3778         if (kvm_load_segment_descriptor(vcpu, tss->es, 1, VCPU_SREG_ES))
3779                 return 1;
3780
3781         if (kvm_load_segment_descriptor(vcpu, tss->cs, 9, VCPU_SREG_CS))
3782                 return 1;
3783
3784         if (kvm_load_segment_descriptor(vcpu, tss->ss, 1, VCPU_SREG_SS))
3785                 return 1;
3786
3787         if (kvm_load_segment_descriptor(vcpu, tss->ds, 1, VCPU_SREG_DS))
3788                 return 1;
3789         return 0;
3790 }
3791
3792 static int kvm_task_switch_16(struct kvm_vcpu *vcpu, u16 tss_selector,
3793                        u32 old_tss_base,
3794                        struct desc_struct *nseg_desc)
3795 {
3796         struct tss_segment_16 tss_segment_16;
3797         int ret = 0;
3798
3799         if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
3800                            sizeof tss_segment_16))
3801                 goto out;
3802
3803         save_state_to_tss16(vcpu, &tss_segment_16);
3804
3805         if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_16,
3806                             sizeof tss_segment_16))
3807                 goto out;
3808
3809         if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
3810                            &tss_segment_16, sizeof tss_segment_16))
3811                 goto out;
3812
3813         if (load_state_from_tss16(vcpu, &tss_segment_16))
3814                 goto out;
3815
3816         ret = 1;
3817 out:
3818         return ret;
3819 }
3820
3821 static int kvm_task_switch_32(struct kvm_vcpu *vcpu, u16 tss_selector,
3822                        u32 old_tss_base,
3823                        struct desc_struct *nseg_desc)
3824 {
3825         struct tss_segment_32 tss_segment_32;
3826         int ret = 0;
3827
3828         if (kvm_read_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
3829                            sizeof tss_segment_32))
3830                 goto out;
3831
3832         save_state_to_tss32(vcpu, &tss_segment_32);
3833
3834         if (kvm_write_guest(vcpu->kvm, old_tss_base, &tss_segment_32,
3835                             sizeof tss_segment_32))
3836                 goto out;
3837
3838         if (kvm_read_guest(vcpu->kvm, get_tss_base_addr(vcpu, nseg_desc),
3839                            &tss_segment_32, sizeof tss_segment_32))
3840                 goto out;
3841
3842         if (load_state_from_tss32(vcpu, &tss_segment_32))
3843                 goto out;
3844
3845         ret = 1;
3846 out:
3847         return ret;
3848 }
3849
3850 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason)
3851 {
3852         struct kvm_segment tr_seg;
3853         struct desc_struct cseg_desc;
3854         struct desc_struct nseg_desc;
3855         int ret = 0;
3856         u32 old_tss_base = get_segment_base(vcpu, VCPU_SREG_TR);
3857         u16 old_tss_sel = get_segment_selector(vcpu, VCPU_SREG_TR);
3858
3859         old_tss_base = vcpu->arch.mmu.gva_to_gpa(vcpu, old_tss_base);
3860
3861         /* FIXME: Handle errors. Failure to read either TSS or their
3862          * descriptors should generate a pagefault.
3863          */
3864         if (load_guest_segment_descriptor(vcpu, tss_selector, &nseg_desc))
3865                 goto out;
3866
3867         if (load_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc))
3868                 goto out;
3869
3870         if (reason != TASK_SWITCH_IRET) {
3871                 int cpl;
3872
3873                 cpl = kvm_x86_ops->get_cpl(vcpu);
3874                 if ((tss_selector & 3) > nseg_desc.dpl || cpl > nseg_desc.dpl) {
3875                         kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
3876                         return 1;
3877                 }
3878         }
3879
3880         if (!nseg_desc.p || (nseg_desc.limit0 | nseg_desc.limit << 16) < 0x67) {
3881                 kvm_queue_exception_e(vcpu, TS_VECTOR, tss_selector & 0xfffc);
3882                 return 1;
3883         }
3884
3885         if (reason == TASK_SWITCH_IRET || reason == TASK_SWITCH_JMP) {
3886                 cseg_desc.type &= ~(1 << 1); //clear the B flag
3887                 save_guest_segment_descriptor(vcpu, old_tss_sel, &cseg_desc);
3888         }
3889
3890         if (reason == TASK_SWITCH_IRET) {
3891                 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3892                 kvm_x86_ops->set_rflags(vcpu, eflags & ~X86_EFLAGS_NT);
3893         }
3894
3895         kvm_x86_ops->skip_emulated_instruction(vcpu);
3896
3897         if (nseg_desc.type & 8)
3898                 ret = kvm_task_switch_32(vcpu, tss_selector, old_tss_base,
3899                                          &nseg_desc);
3900         else
3901                 ret = kvm_task_switch_16(vcpu, tss_selector, old_tss_base,
3902                                          &nseg_desc);
3903
3904         if (reason == TASK_SWITCH_CALL || reason == TASK_SWITCH_GATE) {
3905                 u32 eflags = kvm_x86_ops->get_rflags(vcpu);
3906                 kvm_x86_ops->set_rflags(vcpu, eflags | X86_EFLAGS_NT);
3907         }
3908
3909         if (reason != TASK_SWITCH_IRET) {
3910                 nseg_desc.type |= (1 << 1);
3911                 save_guest_segment_descriptor(vcpu, tss_selector,
3912                                               &nseg_desc);
3913         }
3914
3915         kvm_x86_ops->set_cr0(vcpu, vcpu->arch.cr0 | X86_CR0_TS);
3916         seg_desct_to_kvm_desct(&nseg_desc, tss_selector, &tr_seg);
3917         tr_seg.type = 11;
3918         kvm_set_segment(vcpu, &tr_seg, VCPU_SREG_TR);
3919 out:
3920         return ret;
3921 }
3922 EXPORT_SYMBOL_GPL(kvm_task_switch);
3923
3924 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
3925                                   struct kvm_sregs *sregs)
3926 {
3927         int mmu_reset_needed = 0;
3928         int i, pending_vec, max_bits;
3929         struct descriptor_table dt;
3930
3931         vcpu_load(vcpu);
3932
3933         dt.limit = sregs->idt.limit;
3934         dt.base = sregs->idt.base;
3935         kvm_x86_ops->set_idt(vcpu, &dt);
3936         dt.limit = sregs->gdt.limit;
3937         dt.base = sregs->gdt.base;
3938         kvm_x86_ops->set_gdt(vcpu, &dt);
3939
3940         vcpu->arch.cr2 = sregs->cr2;
3941         mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
3942         vcpu->arch.cr3 = sregs->cr3;
3943
3944         kvm_set_cr8(vcpu, sregs->cr8);
3945
3946         mmu_reset_needed |= vcpu->arch.shadow_efer != sregs->efer;
3947         kvm_x86_ops->set_efer(vcpu, sregs->efer);
3948         kvm_set_apic_base(vcpu, sregs->apic_base);
3949
3950         kvm_x86_ops->decache_cr4_guest_bits(vcpu);
3951
3952         mmu_reset_needed |= vcpu->arch.cr0 != sregs->cr0;
3953         kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
3954         vcpu->arch.cr0 = sregs->cr0;
3955
3956         mmu_reset_needed |= vcpu->arch.cr4 != sregs->cr4;
3957         kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
3958         if (!is_long_mode(vcpu) && is_pae(vcpu))
3959                 load_pdptrs(vcpu, vcpu->arch.cr3);
3960
3961         if (mmu_reset_needed)
3962                 kvm_mmu_reset_context(vcpu);
3963
3964         if (!irqchip_in_kernel(vcpu->kvm)) {
3965                 memcpy(vcpu->arch.irq_pending, sregs->interrupt_bitmap,
3966                        sizeof vcpu->arch.irq_pending);
3967                 vcpu->arch.irq_summary = 0;
3968                 for (i = 0; i < ARRAY_SIZE(vcpu->arch.irq_pending); ++i)
3969                         if (vcpu->arch.irq_pending[i])
3970                                 __set_bit(i, &vcpu->arch.irq_summary);
3971         } else {
3972                 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
3973                 pending_vec = find_first_bit(
3974                         (const unsigned long *)sregs->interrupt_bitmap,
3975                         max_bits);
3976                 /* Only pending external irq is handled here */
3977                 if (pending_vec < max_bits) {
3978                         kvm_x86_ops->set_irq(vcpu, pending_vec);
3979                         pr_debug("Set back pending irq %d\n",
3980                                  pending_vec);
3981                 }
3982                 kvm_pic_clear_isr_ack(vcpu->kvm);
3983         }
3984
3985         kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
3986         kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
3987         kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
3988         kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
3989         kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
3990         kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
3991
3992         kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
3993         kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
3994
3995         /* Older userspace won't unhalt the vcpu on reset. */
3996         if (vcpu->vcpu_id == 0 && kvm_rip_read(vcpu) == 0xfff0 &&
3997             sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
3998             !(vcpu->arch.cr0 & X86_CR0_PE))
3999                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4000
4001         vcpu_put(vcpu);
4002
4003         return 0;
4004 }
4005
4006 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
4007                                         struct kvm_guest_debug *dbg)
4008 {
4009         int i, r;
4010
4011         vcpu_load(vcpu);
4012
4013         if ((dbg->control & (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP)) ==
4014             (KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP)) {
4015                 for (i = 0; i < KVM_NR_DB_REGS; ++i)
4016                         vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
4017                 vcpu->arch.switch_db_regs =
4018                         (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
4019         } else {
4020                 for (i = 0; i < KVM_NR_DB_REGS; i++)
4021                         vcpu->arch.eff_db[i] = vcpu->arch.db[i];
4022                 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
4023         }
4024
4025         r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
4026
4027         if (dbg->control & KVM_GUESTDBG_INJECT_DB)
4028                 kvm_queue_exception(vcpu, DB_VECTOR);
4029         else if (dbg->control & KVM_GUESTDBG_INJECT_BP)
4030                 kvm_queue_exception(vcpu, BP_VECTOR);
4031
4032         vcpu_put(vcpu);
4033
4034         return r;
4035 }
4036
4037 /*
4038  * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
4039  * we have asm/x86/processor.h
4040  */
4041 struct fxsave {
4042         u16     cwd;
4043         u16     swd;
4044         u16     twd;
4045         u16     fop;
4046         u64     rip;
4047         u64     rdp;
4048         u32     mxcsr;
4049         u32     mxcsr_mask;
4050         u32     st_space[32];   /* 8*16 bytes for each FP-reg = 128 bytes */
4051 #ifdef CONFIG_X86_64
4052         u32     xmm_space[64];  /* 16*16 bytes for each XMM-reg = 256 bytes */
4053 #else
4054         u32     xmm_space[32];  /* 8*16 bytes for each XMM-reg = 128 bytes */
4055 #endif
4056 };
4057
4058 /*
4059  * Translate a guest virtual address to a guest physical address.
4060  */
4061 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
4062                                     struct kvm_translation *tr)
4063 {
4064         unsigned long vaddr = tr->linear_address;
4065         gpa_t gpa;
4066
4067         vcpu_load(vcpu);
4068         down_read(&vcpu->kvm->slots_lock);
4069         gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, vaddr);
4070         up_read(&vcpu->kvm->slots_lock);
4071         tr->physical_address = gpa;
4072         tr->valid = gpa != UNMAPPED_GVA;
4073         tr->writeable = 1;
4074         tr->usermode = 0;
4075         vcpu_put(vcpu);
4076
4077         return 0;
4078 }
4079
4080 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4081 {
4082         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
4083
4084         vcpu_load(vcpu);
4085
4086         memcpy(fpu->fpr, fxsave->st_space, 128);
4087         fpu->fcw = fxsave->cwd;
4088         fpu->fsw = fxsave->swd;
4089         fpu->ftwx = fxsave->twd;
4090         fpu->last_opcode = fxsave->fop;
4091         fpu->last_ip = fxsave->rip;
4092         fpu->last_dp = fxsave->rdp;
4093         memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
4094
4095         vcpu_put(vcpu);
4096
4097         return 0;
4098 }
4099
4100 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
4101 {
4102         struct fxsave *fxsave = (struct fxsave *)&vcpu->arch.guest_fx_image;
4103
4104         vcpu_load(vcpu);
4105
4106         memcpy(fxsave->st_space, fpu->fpr, 128);
4107         fxsave->cwd = fpu->fcw;
4108         fxsave->swd = fpu->fsw;
4109         fxsave->twd = fpu->ftwx;
4110         fxsave->fop = fpu->last_opcode;
4111         fxsave->rip = fpu->last_ip;
4112         fxsave->rdp = fpu->last_dp;
4113         memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
4114
4115         vcpu_put(vcpu);
4116
4117         return 0;
4118 }
4119
4120 void fx_init(struct kvm_vcpu *vcpu)
4121 {
4122         unsigned after_mxcsr_mask;
4123
4124         /*
4125          * Touch the fpu the first time in non atomic context as if
4126          * this is the first fpu instruction the exception handler
4127          * will fire before the instruction returns and it'll have to
4128          * allocate ram with GFP_KERNEL.
4129          */
4130         if (!used_math())
4131                 kvm_fx_save(&vcpu->arch.host_fx_image);
4132
4133         /* Initialize guest FPU by resetting ours and saving into guest's */
4134         preempt_disable();
4135         kvm_fx_save(&vcpu->arch.host_fx_image);
4136         kvm_fx_finit();
4137         kvm_fx_save(&vcpu->arch.guest_fx_image);
4138         kvm_fx_restore(&vcpu->arch.host_fx_image);
4139         preempt_enable();
4140
4141         vcpu->arch.cr0 |= X86_CR0_ET;
4142         after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
4143         vcpu->arch.guest_fx_image.mxcsr = 0x1f80;
4144         memset((void *)&vcpu->arch.guest_fx_image + after_mxcsr_mask,
4145                0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
4146 }
4147 EXPORT_SYMBOL_GPL(fx_init);
4148
4149 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
4150 {
4151         if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
4152                 return;
4153
4154         vcpu->guest_fpu_loaded = 1;
4155         kvm_fx_save(&vcpu->arch.host_fx_image);
4156         kvm_fx_restore(&vcpu->arch.guest_fx_image);
4157 }
4158 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
4159
4160 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
4161 {
4162         if (!vcpu->guest_fpu_loaded)
4163                 return;
4164
4165         vcpu->guest_fpu_loaded = 0;
4166         kvm_fx_save(&vcpu->arch.guest_fx_image);
4167         kvm_fx_restore(&vcpu->arch.host_fx_image);
4168         ++vcpu->stat.fpu_reload;
4169 }
4170 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
4171
4172 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
4173 {
4174         if (vcpu->arch.time_page) {
4175                 kvm_release_page_dirty(vcpu->arch.time_page);
4176                 vcpu->arch.time_page = NULL;
4177         }
4178
4179         kvm_x86_ops->vcpu_free(vcpu);
4180 }
4181
4182 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
4183                                                 unsigned int id)
4184 {
4185         return kvm_x86_ops->vcpu_create(kvm, id);
4186 }
4187
4188 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
4189 {
4190         int r;
4191
4192         /* We do fxsave: this must be aligned. */
4193         BUG_ON((unsigned long)&vcpu->arch.host_fx_image & 0xF);
4194
4195         vcpu->arch.mtrr_state.have_fixed = 1;
4196         vcpu_load(vcpu);
4197         r = kvm_arch_vcpu_reset(vcpu);
4198         if (r == 0)
4199                 r = kvm_mmu_setup(vcpu);
4200         vcpu_put(vcpu);
4201         if (r < 0)
4202                 goto free_vcpu;
4203
4204         return 0;
4205 free_vcpu:
4206         kvm_x86_ops->vcpu_free(vcpu);
4207         return r;
4208 }
4209
4210 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
4211 {
4212         vcpu_load(vcpu);
4213         kvm_mmu_unload(vcpu);
4214         vcpu_put(vcpu);
4215
4216         kvm_x86_ops->vcpu_free(vcpu);
4217 }
4218
4219 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
4220 {
4221         vcpu->arch.nmi_pending = false;
4222         vcpu->arch.nmi_injected = false;
4223
4224         vcpu->arch.switch_db_regs = 0;
4225         memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
4226         vcpu->arch.dr6 = DR6_FIXED_1;
4227         vcpu->arch.dr7 = DR7_FIXED_1;
4228
4229         return kvm_x86_ops->vcpu_reset(vcpu);
4230 }
4231
4232 void kvm_arch_hardware_enable(void *garbage)
4233 {
4234         kvm_x86_ops->hardware_enable(garbage);
4235 }
4236
4237 void kvm_arch_hardware_disable(void *garbage)
4238 {
4239         kvm_x86_ops->hardware_disable(garbage);
4240 }
4241
4242 int kvm_arch_hardware_setup(void)
4243 {
4244         return kvm_x86_ops->hardware_setup();
4245 }
4246
4247 void kvm_arch_hardware_unsetup(void)
4248 {
4249         kvm_x86_ops->hardware_unsetup();
4250 }
4251
4252 void kvm_arch_check_processor_compat(void *rtn)
4253 {
4254         kvm_x86_ops->check_processor_compatibility(rtn);
4255 }
4256
4257 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
4258 {
4259         struct page *page;
4260         struct kvm *kvm;
4261         int r;
4262
4263         BUG_ON(vcpu->kvm == NULL);
4264         kvm = vcpu->kvm;
4265
4266         vcpu->arch.mmu.root_hpa = INVALID_PAGE;
4267         if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
4268                 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
4269         else
4270                 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
4271
4272         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
4273         if (!page) {
4274                 r = -ENOMEM;
4275                 goto fail;
4276         }
4277         vcpu->arch.pio_data = page_address(page);
4278
4279         r = kvm_mmu_create(vcpu);
4280         if (r < 0)
4281                 goto fail_free_pio_data;
4282
4283         if (irqchip_in_kernel(kvm)) {
4284                 r = kvm_create_lapic(vcpu);
4285                 if (r < 0)
4286                         goto fail_mmu_destroy;
4287         }
4288
4289         return 0;
4290
4291 fail_mmu_destroy:
4292         kvm_mmu_destroy(vcpu);
4293 fail_free_pio_data:
4294         free_page((unsigned long)vcpu->arch.pio_data);
4295 fail:
4296         return r;
4297 }
4298
4299 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
4300 {
4301         kvm_free_lapic(vcpu);
4302         down_read(&vcpu->kvm->slots_lock);
4303         kvm_mmu_destroy(vcpu);
4304         up_read(&vcpu->kvm->slots_lock);
4305         free_page((unsigned long)vcpu->arch.pio_data);
4306 }
4307
4308 struct  kvm *kvm_arch_create_vm(void)
4309 {
4310         struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
4311
4312         if (!kvm)
4313                 return ERR_PTR(-ENOMEM);
4314
4315         INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
4316         INIT_LIST_HEAD(&kvm->arch.oos_global_pages);
4317         INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
4318
4319         /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
4320         set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
4321
4322         rdtscll(kvm->arch.vm_init_tsc);
4323
4324         return kvm;
4325 }
4326
4327 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
4328 {
4329         vcpu_load(vcpu);
4330         kvm_mmu_unload(vcpu);
4331         vcpu_put(vcpu);
4332 }
4333
4334 static void kvm_free_vcpus(struct kvm *kvm)
4335 {
4336         unsigned int i;
4337
4338         /*
4339          * Unpin any mmu pages first.
4340          */
4341         for (i = 0; i < KVM_MAX_VCPUS; ++i)
4342                 if (kvm->vcpus[i])
4343                         kvm_unload_vcpu_mmu(kvm->vcpus[i]);
4344         for (i = 0; i < KVM_MAX_VCPUS; ++i) {
4345                 if (kvm->vcpus[i]) {
4346                         kvm_arch_vcpu_free(kvm->vcpus[i]);
4347                         kvm->vcpus[i] = NULL;
4348                 }
4349         }
4350
4351 }
4352
4353 void kvm_arch_sync_events(struct kvm *kvm)
4354 {
4355         kvm_free_all_assigned_devices(kvm);
4356 }
4357
4358 void kvm_arch_destroy_vm(struct kvm *kvm)
4359 {
4360         kvm_iommu_unmap_guest(kvm);
4361         kvm_free_pit(kvm);
4362         kfree(kvm->arch.vpic);
4363         kfree(kvm->arch.vioapic);
4364         kvm_free_vcpus(kvm);
4365         kvm_free_physmem(kvm);
4366         if (kvm->arch.apic_access_page)
4367                 put_page(kvm->arch.apic_access_page);
4368         if (kvm->arch.ept_identity_pagetable)
4369                 put_page(kvm->arch.ept_identity_pagetable);
4370         kfree(kvm);
4371 }
4372
4373 int kvm_arch_set_memory_region(struct kvm *kvm,
4374                                 struct kvm_userspace_memory_region *mem,
4375                                 struct kvm_memory_slot old,
4376                                 int user_alloc)
4377 {
4378         int npages = mem->memory_size >> PAGE_SHIFT;
4379         struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
4380
4381         /*To keep backward compatibility with older userspace,
4382          *x86 needs to hanlde !user_alloc case.
4383          */
4384         if (!user_alloc) {
4385                 if (npages && !old.rmap) {
4386                         unsigned long userspace_addr;
4387
4388                         down_write(&current->mm->mmap_sem);
4389                         userspace_addr = do_mmap(NULL, 0,
4390                                                  npages * PAGE_SIZE,
4391                                                  PROT_READ | PROT_WRITE,
4392                                                  MAP_PRIVATE | MAP_ANONYMOUS,
4393                                                  0);
4394                         up_write(&current->mm->mmap_sem);
4395
4396                         if (IS_ERR((void *)userspace_addr))
4397                                 return PTR_ERR((void *)userspace_addr);
4398
4399                         /* set userspace_addr atomically for kvm_hva_to_rmapp */
4400                         spin_lock(&kvm->mmu_lock);
4401                         memslot->userspace_addr = userspace_addr;
4402                         spin_unlock(&kvm->mmu_lock);
4403                 } else {
4404                         if (!old.user_alloc && old.rmap) {
4405                                 int ret;
4406
4407                                 down_write(&current->mm->mmap_sem);
4408                                 ret = do_munmap(current->mm, old.userspace_addr,
4409                                                 old.npages * PAGE_SIZE);
4410                                 up_write(&current->mm->mmap_sem);
4411                                 if (ret < 0)
4412                                         printk(KERN_WARNING
4413                                        "kvm_vm_ioctl_set_memory_region: "
4414                                        "failed to munmap memory\n");
4415                         }
4416                 }
4417         }
4418
4419         if (!kvm->arch.n_requested_mmu_pages) {
4420                 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
4421                 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
4422         }
4423
4424         kvm_mmu_slot_remove_write_access(kvm, mem->slot);
4425         kvm_flush_remote_tlbs(kvm);
4426
4427         return 0;
4428 }
4429
4430 void kvm_arch_flush_shadow(struct kvm *kvm)
4431 {
4432         kvm_mmu_zap_all(kvm);
4433 }
4434
4435 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
4436 {
4437         return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE
4438                || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
4439                || vcpu->arch.nmi_pending;
4440 }
4441
4442 static void vcpu_kick_intr(void *info)
4443 {
4444 #ifdef DEBUG
4445         struct kvm_vcpu *vcpu = (struct kvm_vcpu *)info;
4446         printk(KERN_DEBUG "vcpu_kick_intr %p \n", vcpu);
4447 #endif
4448 }
4449
4450 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
4451 {
4452         int ipi_pcpu = vcpu->cpu;
4453         int cpu = get_cpu();
4454
4455         if (waitqueue_active(&vcpu->wq)) {
4456                 wake_up_interruptible(&vcpu->wq);
4457                 ++vcpu->stat.halt_wakeup;
4458         }
4459         /*
4460          * We may be called synchronously with irqs disabled in guest mode,
4461          * So need not to call smp_call_function_single() in that case.
4462          */
4463         if (vcpu->guest_mode && vcpu->cpu != cpu)
4464                 smp_call_function_single(ipi_pcpu, vcpu_kick_intr, vcpu, 0);
4465         put_cpu();
4466 }