2 * Kernel-based Virtual Machine driver for Linux
4 * derived from drivers/kvm/kvm_main.c
6 * Copyright (C) 2006 Qumranet, Inc.
7 * Copyright (C) 2008 Qumranet, Inc.
8 * Copyright IBM Corporation, 2008
9 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
12 * Avi Kivity <avi@qumranet.com>
13 * Yaniv Kamay <yaniv@qumranet.com>
14 * Amit Shah <amit.shah@qumranet.com>
15 * Ben-Ami Yassour <benami@il.ibm.com>
17 * This work is licensed under the terms of the GNU GPL, version 2. See
18 * the COPYING file in the top-level directory.
22 #include <linux/kvm_host.h>
27 #include "kvm_cache_regs.h"
30 #include <linux/clocksource.h>
31 #include <linux/interrupt.h>
32 #include <linux/kvm.h>
34 #include <linux/vmalloc.h>
35 #include <linux/module.h>
36 #include <linux/mman.h>
37 #include <linux/highmem.h>
38 #include <linux/iommu.h>
39 #include <linux/intel-iommu.h>
40 #include <linux/cpufreq.h>
41 #include <linux/user-return-notifier.h>
42 #include <linux/srcu.h>
43 #include <linux/slab.h>
44 #include <linux/perf_event.h>
45 #include <linux/uaccess.h>
46 #include <linux/hash.h>
47 #include <trace/events/kvm.h>
49 #define CREATE_TRACE_POINTS
52 #include <asm/debugreg.h>
59 #include <asm/pvclock.h>
60 #include <asm/div64.h>
62 #define MAX_IO_MSRS 256
63 #define CR0_RESERVED_BITS \
64 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
65 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
66 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
67 #define CR4_RESERVED_BITS \
68 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
69 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
70 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
72 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
74 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
76 #define KVM_MAX_MCE_BANKS 32
77 #define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
80 * - enable syscall per default because its emulated by KVM
81 * - enable LME and LMA per default on 64 bit KVM
84 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffafeULL;
86 static u64 __read_mostly efer_reserved_bits = 0xfffffffffffffffeULL;
89 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
90 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
92 static void update_cr8_intercept(struct kvm_vcpu *vcpu);
93 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
94 struct kvm_cpuid_entry2 __user *entries);
96 struct kvm_x86_ops *kvm_x86_ops;
97 EXPORT_SYMBOL_GPL(kvm_x86_ops);
100 module_param_named(ignore_msrs, ignore_msrs, bool, S_IRUGO | S_IWUSR);
102 #define KVM_NR_SHARED_MSRS 16
104 struct kvm_shared_msrs_global {
106 u32 msrs[KVM_NR_SHARED_MSRS];
109 struct kvm_shared_msrs {
110 struct user_return_notifier urn;
112 struct kvm_shared_msr_values {
115 } values[KVM_NR_SHARED_MSRS];
118 static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
119 static DEFINE_PER_CPU(struct kvm_shared_msrs, shared_msrs);
121 struct kvm_stats_debugfs_item debugfs_entries[] = {
122 { "pf_fixed", VCPU_STAT(pf_fixed) },
123 { "pf_guest", VCPU_STAT(pf_guest) },
124 { "tlb_flush", VCPU_STAT(tlb_flush) },
125 { "invlpg", VCPU_STAT(invlpg) },
126 { "exits", VCPU_STAT(exits) },
127 { "io_exits", VCPU_STAT(io_exits) },
128 { "mmio_exits", VCPU_STAT(mmio_exits) },
129 { "signal_exits", VCPU_STAT(signal_exits) },
130 { "irq_window", VCPU_STAT(irq_window_exits) },
131 { "nmi_window", VCPU_STAT(nmi_window_exits) },
132 { "halt_exits", VCPU_STAT(halt_exits) },
133 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
134 { "hypercalls", VCPU_STAT(hypercalls) },
135 { "request_irq", VCPU_STAT(request_irq_exits) },
136 { "irq_exits", VCPU_STAT(irq_exits) },
137 { "host_state_reload", VCPU_STAT(host_state_reload) },
138 { "efer_reload", VCPU_STAT(efer_reload) },
139 { "fpu_reload", VCPU_STAT(fpu_reload) },
140 { "insn_emulation", VCPU_STAT(insn_emulation) },
141 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
142 { "irq_injections", VCPU_STAT(irq_injections) },
143 { "nmi_injections", VCPU_STAT(nmi_injections) },
144 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
145 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
146 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
147 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
148 { "mmu_flooded", VM_STAT(mmu_flooded) },
149 { "mmu_recycled", VM_STAT(mmu_recycled) },
150 { "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
151 { "mmu_unsync", VM_STAT(mmu_unsync) },
152 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
153 { "largepages", VM_STAT(lpages) },
157 u64 __read_mostly host_xcr0;
159 static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
162 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
163 vcpu->arch.apf.gfns[i] = ~0;
166 static void kvm_on_user_return(struct user_return_notifier *urn)
169 struct kvm_shared_msrs *locals
170 = container_of(urn, struct kvm_shared_msrs, urn);
171 struct kvm_shared_msr_values *values;
173 for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
174 values = &locals->values[slot];
175 if (values->host != values->curr) {
176 wrmsrl(shared_msrs_global.msrs[slot], values->host);
177 values->curr = values->host;
180 locals->registered = false;
181 user_return_notifier_unregister(urn);
184 static void shared_msr_update(unsigned slot, u32 msr)
186 struct kvm_shared_msrs *smsr;
189 smsr = &__get_cpu_var(shared_msrs);
190 /* only read, and nobody should modify it at this time,
191 * so don't need lock */
192 if (slot >= shared_msrs_global.nr) {
193 printk(KERN_ERR "kvm: invalid MSR slot!");
196 rdmsrl_safe(msr, &value);
197 smsr->values[slot].host = value;
198 smsr->values[slot].curr = value;
201 void kvm_define_shared_msr(unsigned slot, u32 msr)
203 if (slot >= shared_msrs_global.nr)
204 shared_msrs_global.nr = slot + 1;
205 shared_msrs_global.msrs[slot] = msr;
206 /* we need ensured the shared_msr_global have been updated */
209 EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
211 static void kvm_shared_msr_cpu_online(void)
215 for (i = 0; i < shared_msrs_global.nr; ++i)
216 shared_msr_update(i, shared_msrs_global.msrs[i]);
219 void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
221 struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
223 if (((value ^ smsr->values[slot].curr) & mask) == 0)
225 smsr->values[slot].curr = value;
226 wrmsrl(shared_msrs_global.msrs[slot], value);
227 if (!smsr->registered) {
228 smsr->urn.on_user_return = kvm_on_user_return;
229 user_return_notifier_register(&smsr->urn);
230 smsr->registered = true;
233 EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
235 static void drop_user_return_notifiers(void *ignore)
237 struct kvm_shared_msrs *smsr = &__get_cpu_var(shared_msrs);
239 if (smsr->registered)
240 kvm_on_user_return(&smsr->urn);
243 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
245 if (irqchip_in_kernel(vcpu->kvm))
246 return vcpu->arch.apic_base;
248 return vcpu->arch.apic_base;
250 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
252 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
254 /* TODO: reserve bits check */
255 if (irqchip_in_kernel(vcpu->kvm))
256 kvm_lapic_set_base(vcpu, data);
258 vcpu->arch.apic_base = data;
260 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
262 #define EXCPT_BENIGN 0
263 #define EXCPT_CONTRIBUTORY 1
266 static int exception_class(int vector)
276 return EXCPT_CONTRIBUTORY;
283 static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
284 unsigned nr, bool has_error, u32 error_code,
290 kvm_make_request(KVM_REQ_EVENT, vcpu);
292 if (!vcpu->arch.exception.pending) {
294 vcpu->arch.exception.pending = true;
295 vcpu->arch.exception.has_error_code = has_error;
296 vcpu->arch.exception.nr = nr;
297 vcpu->arch.exception.error_code = error_code;
298 vcpu->arch.exception.reinject = reinject;
302 /* to check exception */
303 prev_nr = vcpu->arch.exception.nr;
304 if (prev_nr == DF_VECTOR) {
305 /* triple fault -> shutdown */
306 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
309 class1 = exception_class(prev_nr);
310 class2 = exception_class(nr);
311 if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
312 || (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
313 /* generate double fault per SDM Table 5-5 */
314 vcpu->arch.exception.pending = true;
315 vcpu->arch.exception.has_error_code = true;
316 vcpu->arch.exception.nr = DF_VECTOR;
317 vcpu->arch.exception.error_code = 0;
319 /* replace previous exception with a new one in a hope
320 that instruction re-execution will regenerate lost
325 void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
327 kvm_multiple_exception(vcpu, nr, false, 0, false);
329 EXPORT_SYMBOL_GPL(kvm_queue_exception);
331 void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
333 kvm_multiple_exception(vcpu, nr, false, 0, true);
335 EXPORT_SYMBOL_GPL(kvm_requeue_exception);
337 void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
340 kvm_inject_gp(vcpu, 0);
342 kvm_x86_ops->skip_emulated_instruction(vcpu);
344 EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
346 void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
348 ++vcpu->stat.pf_guest;
349 vcpu->arch.cr2 = fault->address;
350 kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
353 void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
355 if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
356 vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
358 vcpu->arch.mmu.inject_page_fault(vcpu, fault);
361 void kvm_inject_nmi(struct kvm_vcpu *vcpu)
363 kvm_make_request(KVM_REQ_NMI, vcpu);
364 kvm_make_request(KVM_REQ_EVENT, vcpu);
366 EXPORT_SYMBOL_GPL(kvm_inject_nmi);
368 void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
370 kvm_multiple_exception(vcpu, nr, true, error_code, false);
372 EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
374 void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
376 kvm_multiple_exception(vcpu, nr, true, error_code, true);
378 EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
381 * Checks if cpl <= required_cpl; if true, return true. Otherwise queue
382 * a #GP and return false.
384 bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
386 if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
388 kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
391 EXPORT_SYMBOL_GPL(kvm_require_cpl);
394 * This function will be used to read from the physical memory of the currently
395 * running guest. The difference to kvm_read_guest_page is that this function
396 * can read from guest physical or from the guest's guest physical memory.
398 int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
399 gfn_t ngfn, void *data, int offset, int len,
405 ngpa = gfn_to_gpa(ngfn);
406 real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
407 if (real_gfn == UNMAPPED_GVA)
410 real_gfn = gpa_to_gfn(real_gfn);
412 return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
414 EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
416 int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
417 void *data, int offset, int len, u32 access)
419 return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
420 data, offset, len, access);
424 * Load the pae pdptrs. Return true is they are all valid.
426 int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
428 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
429 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
432 u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
434 ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
435 offset * sizeof(u64), sizeof(pdpte),
436 PFERR_USER_MASK|PFERR_WRITE_MASK);
441 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
442 if (is_present_gpte(pdpte[i]) &&
443 (pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
450 memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
451 __set_bit(VCPU_EXREG_PDPTR,
452 (unsigned long *)&vcpu->arch.regs_avail);
453 __set_bit(VCPU_EXREG_PDPTR,
454 (unsigned long *)&vcpu->arch.regs_dirty);
459 EXPORT_SYMBOL_GPL(load_pdptrs);
461 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
463 u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
469 if (is_long_mode(vcpu) || !is_pae(vcpu))
472 if (!test_bit(VCPU_EXREG_PDPTR,
473 (unsigned long *)&vcpu->arch.regs_avail))
476 gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
477 offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
478 r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
479 PFERR_USER_MASK | PFERR_WRITE_MASK);
482 changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
488 int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
490 unsigned long old_cr0 = kvm_read_cr0(vcpu);
491 unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
492 X86_CR0_CD | X86_CR0_NW;
497 if (cr0 & 0xffffffff00000000UL)
501 cr0 &= ~CR0_RESERVED_BITS;
503 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
506 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
509 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
511 if ((vcpu->arch.efer & EFER_LME)) {
516 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
521 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
526 kvm_x86_ops->set_cr0(vcpu, cr0);
528 if ((cr0 ^ old_cr0) & X86_CR0_PG) {
529 kvm_clear_async_pf_completion_queue(vcpu);
530 kvm_async_pf_hash_reset(vcpu);
533 if ((cr0 ^ old_cr0) & update_bits)
534 kvm_mmu_reset_context(vcpu);
537 EXPORT_SYMBOL_GPL(kvm_set_cr0);
539 void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
541 (void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
543 EXPORT_SYMBOL_GPL(kvm_lmsw);
545 int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
549 /* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
550 if (index != XCR_XFEATURE_ENABLED_MASK)
553 if (kvm_x86_ops->get_cpl(vcpu) != 0)
555 if (!(xcr0 & XSTATE_FP))
557 if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
559 if (xcr0 & ~host_xcr0)
561 vcpu->arch.xcr0 = xcr0;
562 vcpu->guest_xcr0_loaded = 0;
566 int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
568 if (__kvm_set_xcr(vcpu, index, xcr)) {
569 kvm_inject_gp(vcpu, 0);
574 EXPORT_SYMBOL_GPL(kvm_set_xcr);
576 static bool guest_cpuid_has_xsave(struct kvm_vcpu *vcpu)
578 struct kvm_cpuid_entry2 *best;
580 best = kvm_find_cpuid_entry(vcpu, 1, 0);
581 return best && (best->ecx & bit(X86_FEATURE_XSAVE));
584 static void update_cpuid(struct kvm_vcpu *vcpu)
586 struct kvm_cpuid_entry2 *best;
588 best = kvm_find_cpuid_entry(vcpu, 1, 0);
592 /* Update OSXSAVE bit */
593 if (cpu_has_xsave && best->function == 0x1) {
594 best->ecx &= ~(bit(X86_FEATURE_OSXSAVE));
595 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE))
596 best->ecx |= bit(X86_FEATURE_OSXSAVE);
600 int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
602 unsigned long old_cr4 = kvm_read_cr4(vcpu);
603 unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE | X86_CR4_PAE;
605 if (cr4 & CR4_RESERVED_BITS)
608 if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
611 if (is_long_mode(vcpu)) {
612 if (!(cr4 & X86_CR4_PAE))
614 } else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
615 && ((cr4 ^ old_cr4) & pdptr_bits)
616 && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
620 if (cr4 & X86_CR4_VMXE)
623 kvm_x86_ops->set_cr4(vcpu, cr4);
625 if ((cr4 ^ old_cr4) & pdptr_bits)
626 kvm_mmu_reset_context(vcpu);
628 if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
633 EXPORT_SYMBOL_GPL(kvm_set_cr4);
635 int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
637 if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
638 kvm_mmu_sync_roots(vcpu);
639 kvm_mmu_flush_tlb(vcpu);
643 if (is_long_mode(vcpu)) {
644 if (cr3 & CR3_L_MODE_RESERVED_BITS)
648 if (cr3 & CR3_PAE_RESERVED_BITS)
650 if (is_paging(vcpu) &&
651 !load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
655 * We don't check reserved bits in nonpae mode, because
656 * this isn't enforced, and VMware depends on this.
661 * Does the new cr3 value map to physical memory? (Note, we
662 * catch an invalid cr3 even in real-mode, because it would
663 * cause trouble later on when we turn on paging anyway.)
665 * A real CPU would silently accept an invalid cr3 and would
666 * attempt to use it - with largely undefined (and often hard
667 * to debug) behavior on the guest side.
669 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
671 vcpu->arch.cr3 = cr3;
672 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
673 vcpu->arch.mmu.new_cr3(vcpu);
676 EXPORT_SYMBOL_GPL(kvm_set_cr3);
678 int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
680 if (cr8 & CR8_RESERVED_BITS)
682 if (irqchip_in_kernel(vcpu->kvm))
683 kvm_lapic_set_tpr(vcpu, cr8);
685 vcpu->arch.cr8 = cr8;
688 EXPORT_SYMBOL_GPL(kvm_set_cr8);
690 unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
692 if (irqchip_in_kernel(vcpu->kvm))
693 return kvm_lapic_get_cr8(vcpu);
695 return vcpu->arch.cr8;
697 EXPORT_SYMBOL_GPL(kvm_get_cr8);
699 static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
703 vcpu->arch.db[dr] = val;
704 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
705 vcpu->arch.eff_db[dr] = val;
708 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
712 if (val & 0xffffffff00000000ULL)
714 vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
717 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
721 if (val & 0xffffffff00000000ULL)
723 vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
724 if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)) {
725 kvm_x86_ops->set_dr7(vcpu, vcpu->arch.dr7);
726 vcpu->arch.switch_db_regs = (val & DR7_BP_EN_MASK);
734 int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
738 res = __kvm_set_dr(vcpu, dr, val);
740 kvm_queue_exception(vcpu, UD_VECTOR);
742 kvm_inject_gp(vcpu, 0);
746 EXPORT_SYMBOL_GPL(kvm_set_dr);
748 static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
752 *val = vcpu->arch.db[dr];
755 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
759 *val = vcpu->arch.dr6;
762 if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
766 *val = vcpu->arch.dr7;
773 int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
775 if (_kvm_get_dr(vcpu, dr, val)) {
776 kvm_queue_exception(vcpu, UD_VECTOR);
781 EXPORT_SYMBOL_GPL(kvm_get_dr);
784 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
785 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
787 * This list is modified at module load time to reflect the
788 * capabilities of the host cpu. This capabilities test skips MSRs that are
789 * kvm-specific. Those are put in the beginning of the list.
792 #define KVM_SAVE_MSRS_BEGIN 8
793 static u32 msrs_to_save[] = {
794 MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
795 MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
796 HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
797 HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN,
798 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
801 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
803 MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA
806 static unsigned num_msrs_to_save;
808 static u32 emulated_msrs[] = {
809 MSR_IA32_MISC_ENABLE,
814 static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
816 u64 old_efer = vcpu->arch.efer;
818 if (efer & efer_reserved_bits)
822 && (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
825 if (efer & EFER_FFXSR) {
826 struct kvm_cpuid_entry2 *feat;
828 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
829 if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
833 if (efer & EFER_SVME) {
834 struct kvm_cpuid_entry2 *feat;
836 feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
837 if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
842 efer |= vcpu->arch.efer & EFER_LMA;
844 kvm_x86_ops->set_efer(vcpu, efer);
846 vcpu->arch.mmu.base_role.nxe = (efer & EFER_NX) && !tdp_enabled;
848 /* Update reserved bits */
849 if ((efer ^ old_efer) & EFER_NX)
850 kvm_mmu_reset_context(vcpu);
855 void kvm_enable_efer_bits(u64 mask)
857 efer_reserved_bits &= ~mask;
859 EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
863 * Writes msr value into into the appropriate "register".
864 * Returns 0 on success, non-0 otherwise.
865 * Assumes vcpu_load() was already called.
867 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
869 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
873 * Adapt set_msr() to msr_io()'s calling convention
875 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
877 return kvm_set_msr(vcpu, index, *data);
880 static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
884 struct pvclock_wall_clock wc;
885 struct timespec boot;
890 r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
895 ++version; /* first time write, random junk */
899 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
902 * The guest calculates current wall clock time by adding
903 * system time (updated by kvm_guest_time_update below) to the
904 * wall clock specified here. guest system time equals host
905 * system time for us, thus we must fill in host boot time here.
909 wc.sec = boot.tv_sec;
910 wc.nsec = boot.tv_nsec;
911 wc.version = version;
913 kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
916 kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
919 static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
921 uint32_t quotient, remainder;
923 /* Don't try to replace with do_div(), this one calculates
924 * "(dividend << 32) / divisor" */
926 : "=a" (quotient), "=d" (remainder)
927 : "0" (0), "1" (dividend), "r" (divisor) );
931 static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
932 s8 *pshift, u32 *pmultiplier)
939 tps64 = base_khz * 1000LL;
940 scaled64 = scaled_khz * 1000LL;
941 while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
946 tps32 = (uint32_t)tps64;
947 while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
948 if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
956 *pmultiplier = div_frac(scaled64, tps32);
958 pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
959 __func__, base_khz, scaled_khz, shift, *pmultiplier);
962 static inline u64 get_kernel_ns(void)
966 WARN_ON(preemptible());
968 monotonic_to_bootbased(&ts);
969 return timespec_to_ns(&ts);
972 static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
973 unsigned long max_tsc_khz;
975 static inline int kvm_tsc_changes_freq(void)
978 int ret = !boot_cpu_has(X86_FEATURE_CONSTANT_TSC) &&
979 cpufreq_quick_get(cpu) != 0;
984 static inline u64 nsec_to_cycles(u64 nsec)
988 WARN_ON(preemptible());
989 if (kvm_tsc_changes_freq())
990 printk_once(KERN_WARNING
991 "kvm: unreliable cycle conversion on adjustable rate TSC\n");
992 ret = nsec * __this_cpu_read(cpu_tsc_khz);
993 do_div(ret, USEC_PER_SEC);
997 static void kvm_arch_set_tsc_khz(struct kvm *kvm, u32 this_tsc_khz)
999 /* Compute a scale to convert nanoseconds in TSC cycles */
1000 kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
1001 &kvm->arch.virtual_tsc_shift,
1002 &kvm->arch.virtual_tsc_mult);
1003 kvm->arch.virtual_tsc_khz = this_tsc_khz;
1006 static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
1008 u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.last_tsc_nsec,
1009 vcpu->kvm->arch.virtual_tsc_mult,
1010 vcpu->kvm->arch.virtual_tsc_shift);
1011 tsc += vcpu->arch.last_tsc_write;
1015 void kvm_write_tsc(struct kvm_vcpu *vcpu, u64 data)
1017 struct kvm *kvm = vcpu->kvm;
1018 u64 offset, ns, elapsed;
1019 unsigned long flags;
1022 raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
1023 offset = data - native_read_tsc();
1024 ns = get_kernel_ns();
1025 elapsed = ns - kvm->arch.last_tsc_nsec;
1026 sdiff = data - kvm->arch.last_tsc_write;
1031 * Special case: close write to TSC within 5 seconds of
1032 * another CPU is interpreted as an attempt to synchronize
1033 * The 5 seconds is to accomodate host load / swapping as
1034 * well as any reset of TSC during the boot process.
1036 * In that case, for a reliable TSC, we can match TSC offsets,
1037 * or make a best guest using elapsed value.
1039 if (sdiff < nsec_to_cycles(5ULL * NSEC_PER_SEC) &&
1040 elapsed < 5ULL * NSEC_PER_SEC) {
1041 if (!check_tsc_unstable()) {
1042 offset = kvm->arch.last_tsc_offset;
1043 pr_debug("kvm: matched tsc offset for %llu\n", data);
1045 u64 delta = nsec_to_cycles(elapsed);
1047 pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
1049 ns = kvm->arch.last_tsc_nsec;
1051 kvm->arch.last_tsc_nsec = ns;
1052 kvm->arch.last_tsc_write = data;
1053 kvm->arch.last_tsc_offset = offset;
1054 kvm_x86_ops->write_tsc_offset(vcpu, offset);
1055 raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
1057 /* Reset of TSC must disable overshoot protection below */
1058 vcpu->arch.hv_clock.tsc_timestamp = 0;
1059 vcpu->arch.last_tsc_write = data;
1060 vcpu->arch.last_tsc_nsec = ns;
1062 EXPORT_SYMBOL_GPL(kvm_write_tsc);
1064 static int kvm_guest_time_update(struct kvm_vcpu *v)
1066 unsigned long flags;
1067 struct kvm_vcpu_arch *vcpu = &v->arch;
1069 unsigned long this_tsc_khz;
1070 s64 kernel_ns, max_kernel_ns;
1073 /* Keep irq disabled to prevent changes to the clock */
1074 local_irq_save(flags);
1075 kvm_get_msr(v, MSR_IA32_TSC, &tsc_timestamp);
1076 kernel_ns = get_kernel_ns();
1077 this_tsc_khz = __this_cpu_read(cpu_tsc_khz);
1079 if (unlikely(this_tsc_khz == 0)) {
1080 local_irq_restore(flags);
1081 kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
1086 * We may have to catch up the TSC to match elapsed wall clock
1087 * time for two reasons, even if kvmclock is used.
1088 * 1) CPU could have been running below the maximum TSC rate
1089 * 2) Broken TSC compensation resets the base at each VCPU
1090 * entry to avoid unknown leaps of TSC even when running
1091 * again on the same CPU. This may cause apparent elapsed
1092 * time to disappear, and the guest to stand still or run
1095 if (vcpu->tsc_catchup) {
1096 u64 tsc = compute_guest_tsc(v, kernel_ns);
1097 if (tsc > tsc_timestamp) {
1098 kvm_x86_ops->adjust_tsc_offset(v, tsc - tsc_timestamp);
1099 tsc_timestamp = tsc;
1103 local_irq_restore(flags);
1105 if (!vcpu->time_page)
1109 * Time as measured by the TSC may go backwards when resetting the base
1110 * tsc_timestamp. The reason for this is that the TSC resolution is
1111 * higher than the resolution of the other clock scales. Thus, many
1112 * possible measurments of the TSC correspond to one measurement of any
1113 * other clock, and so a spread of values is possible. This is not a
1114 * problem for the computation of the nanosecond clock; with TSC rates
1115 * around 1GHZ, there can only be a few cycles which correspond to one
1116 * nanosecond value, and any path through this code will inevitably
1117 * take longer than that. However, with the kernel_ns value itself,
1118 * the precision may be much lower, down to HZ granularity. If the
1119 * first sampling of TSC against kernel_ns ends in the low part of the
1120 * range, and the second in the high end of the range, we can get:
1122 * (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
1124 * As the sampling errors potentially range in the thousands of cycles,
1125 * it is possible such a time value has already been observed by the
1126 * guest. To protect against this, we must compute the system time as
1127 * observed by the guest and ensure the new system time is greater.
1130 if (vcpu->hv_clock.tsc_timestamp && vcpu->last_guest_tsc) {
1131 max_kernel_ns = vcpu->last_guest_tsc -
1132 vcpu->hv_clock.tsc_timestamp;
1133 max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
1134 vcpu->hv_clock.tsc_to_system_mul,
1135 vcpu->hv_clock.tsc_shift);
1136 max_kernel_ns += vcpu->last_kernel_ns;
1139 if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
1140 kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
1141 &vcpu->hv_clock.tsc_shift,
1142 &vcpu->hv_clock.tsc_to_system_mul);
1143 vcpu->hw_tsc_khz = this_tsc_khz;
1146 if (max_kernel_ns > kernel_ns)
1147 kernel_ns = max_kernel_ns;
1149 /* With all the info we got, fill in the values */
1150 vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
1151 vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
1152 vcpu->last_kernel_ns = kernel_ns;
1153 vcpu->last_guest_tsc = tsc_timestamp;
1154 vcpu->hv_clock.flags = 0;
1157 * The interface expects us to write an even number signaling that the
1158 * update is finished. Since the guest won't see the intermediate
1159 * state, we just increase by 2 at the end.
1161 vcpu->hv_clock.version += 2;
1163 shared_kaddr = kmap_atomic(vcpu->time_page, KM_USER0);
1165 memcpy(shared_kaddr + vcpu->time_offset, &vcpu->hv_clock,
1166 sizeof(vcpu->hv_clock));
1168 kunmap_atomic(shared_kaddr, KM_USER0);
1170 mark_page_dirty(v->kvm, vcpu->time >> PAGE_SHIFT);
1174 static bool msr_mtrr_valid(unsigned msr)
1177 case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
1178 case MSR_MTRRfix64K_00000:
1179 case MSR_MTRRfix16K_80000:
1180 case MSR_MTRRfix16K_A0000:
1181 case MSR_MTRRfix4K_C0000:
1182 case MSR_MTRRfix4K_C8000:
1183 case MSR_MTRRfix4K_D0000:
1184 case MSR_MTRRfix4K_D8000:
1185 case MSR_MTRRfix4K_E0000:
1186 case MSR_MTRRfix4K_E8000:
1187 case MSR_MTRRfix4K_F0000:
1188 case MSR_MTRRfix4K_F8000:
1189 case MSR_MTRRdefType:
1190 case MSR_IA32_CR_PAT:
1198 static bool valid_pat_type(unsigned t)
1200 return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
1203 static bool valid_mtrr_type(unsigned t)
1205 return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
1208 static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1212 if (!msr_mtrr_valid(msr))
1215 if (msr == MSR_IA32_CR_PAT) {
1216 for (i = 0; i < 8; i++)
1217 if (!valid_pat_type((data >> (i * 8)) & 0xff))
1220 } else if (msr == MSR_MTRRdefType) {
1223 return valid_mtrr_type(data & 0xff);
1224 } else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
1225 for (i = 0; i < 8 ; i++)
1226 if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
1231 /* variable MTRRs */
1232 return valid_mtrr_type(data & 0xff);
1235 static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1237 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1239 if (!mtrr_valid(vcpu, msr, data))
1242 if (msr == MSR_MTRRdefType) {
1243 vcpu->arch.mtrr_state.def_type = data;
1244 vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
1245 } else if (msr == MSR_MTRRfix64K_00000)
1247 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1248 p[1 + msr - MSR_MTRRfix16K_80000] = data;
1249 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1250 p[3 + msr - MSR_MTRRfix4K_C0000] = data;
1251 else if (msr == MSR_IA32_CR_PAT)
1252 vcpu->arch.pat = data;
1253 else { /* Variable MTRRs */
1254 int idx, is_mtrr_mask;
1257 idx = (msr - 0x200) / 2;
1258 is_mtrr_mask = msr - 0x200 - 2 * idx;
1261 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1264 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1268 kvm_mmu_reset_context(vcpu);
1272 static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1274 u64 mcg_cap = vcpu->arch.mcg_cap;
1275 unsigned bank_num = mcg_cap & 0xff;
1278 case MSR_IA32_MCG_STATUS:
1279 vcpu->arch.mcg_status = data;
1281 case MSR_IA32_MCG_CTL:
1282 if (!(mcg_cap & MCG_CTL_P))
1284 if (data != 0 && data != ~(u64)0)
1286 vcpu->arch.mcg_ctl = data;
1289 if (msr >= MSR_IA32_MC0_CTL &&
1290 msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1291 u32 offset = msr - MSR_IA32_MC0_CTL;
1292 /* only 0 or all 1s can be written to IA32_MCi_CTL
1293 * some Linux kernels though clear bit 10 in bank 4 to
1294 * workaround a BIOS/GART TBL issue on AMD K8s, ignore
1295 * this to avoid an uncatched #GP in the guest
1297 if ((offset & 0x3) == 0 &&
1298 data != 0 && (data | (1 << 10)) != ~(u64)0)
1300 vcpu->arch.mce_banks[offset] = data;
1308 static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
1310 struct kvm *kvm = vcpu->kvm;
1311 int lm = is_long_mode(vcpu);
1312 u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
1313 : (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
1314 u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
1315 : kvm->arch.xen_hvm_config.blob_size_32;
1316 u32 page_num = data & ~PAGE_MASK;
1317 u64 page_addr = data & PAGE_MASK;
1322 if (page_num >= blob_size)
1325 page = kzalloc(PAGE_SIZE, GFP_KERNEL);
1329 if (copy_from_user(page, blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE))
1331 if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
1340 static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
1342 return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
1345 static bool kvm_hv_msr_partition_wide(u32 msr)
1349 case HV_X64_MSR_GUEST_OS_ID:
1350 case HV_X64_MSR_HYPERCALL:
1358 static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1360 struct kvm *kvm = vcpu->kvm;
1363 case HV_X64_MSR_GUEST_OS_ID:
1364 kvm->arch.hv_guest_os_id = data;
1365 /* setting guest os id to zero disables hypercall page */
1366 if (!kvm->arch.hv_guest_os_id)
1367 kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
1369 case HV_X64_MSR_HYPERCALL: {
1374 /* if guest os id is not set hypercall should remain disabled */
1375 if (!kvm->arch.hv_guest_os_id)
1377 if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
1378 kvm->arch.hv_hypercall = data;
1381 gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
1382 addr = gfn_to_hva(kvm, gfn);
1383 if (kvm_is_error_hva(addr))
1385 kvm_x86_ops->patch_hypercall(vcpu, instructions);
1386 ((unsigned char *)instructions)[3] = 0xc3; /* ret */
1387 if (copy_to_user((void __user *)addr, instructions, 4))
1389 kvm->arch.hv_hypercall = data;
1393 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1394 "data 0x%llx\n", msr, data);
1400 static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1403 case HV_X64_MSR_APIC_ASSIST_PAGE: {
1406 if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
1407 vcpu->arch.hv_vapic = data;
1410 addr = gfn_to_hva(vcpu->kvm, data >>
1411 HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
1412 if (kvm_is_error_hva(addr))
1414 if (clear_user((void __user *)addr, PAGE_SIZE))
1416 vcpu->arch.hv_vapic = data;
1419 case HV_X64_MSR_EOI:
1420 return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
1421 case HV_X64_MSR_ICR:
1422 return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
1423 case HV_X64_MSR_TPR:
1424 return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
1426 pr_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
1427 "data 0x%llx\n", msr, data);
1434 static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
1436 gpa_t gpa = data & ~0x3f;
1438 /* Bits 2:5 are resrved, Should be zero */
1442 vcpu->arch.apf.msr_val = data;
1444 if (!(data & KVM_ASYNC_PF_ENABLED)) {
1445 kvm_clear_async_pf_completion_queue(vcpu);
1446 kvm_async_pf_hash_reset(vcpu);
1450 if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa))
1453 vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
1454 kvm_async_pf_wakeup_all(vcpu);
1458 static void kvmclock_reset(struct kvm_vcpu *vcpu)
1460 if (vcpu->arch.time_page) {
1461 kvm_release_page_dirty(vcpu->arch.time_page);
1462 vcpu->arch.time_page = NULL;
1466 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1470 return set_efer(vcpu, data);
1472 data &= ~(u64)0x40; /* ignore flush filter disable */
1473 data &= ~(u64)0x100; /* ignore ignne emulation enable */
1475 pr_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
1480 case MSR_FAM10H_MMIO_CONF_BASE:
1482 pr_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
1487 case MSR_AMD64_NB_CFG:
1489 case MSR_IA32_DEBUGCTLMSR:
1491 /* We support the non-activated case already */
1493 } else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
1494 /* Values other than LBR and BTF are vendor-specific,
1495 thus reserved and should throw a #GP */
1498 pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
1501 case MSR_IA32_UCODE_REV:
1502 case MSR_IA32_UCODE_WRITE:
1503 case MSR_VM_HSAVE_PA:
1504 case MSR_AMD64_PATCH_LOADER:
1506 case 0x200 ... 0x2ff:
1507 return set_msr_mtrr(vcpu, msr, data);
1508 case MSR_IA32_APICBASE:
1509 kvm_set_apic_base(vcpu, data);
1511 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1512 return kvm_x2apic_msr_write(vcpu, msr, data);
1513 case MSR_IA32_MISC_ENABLE:
1514 vcpu->arch.ia32_misc_enable_msr = data;
1516 case MSR_KVM_WALL_CLOCK_NEW:
1517 case MSR_KVM_WALL_CLOCK:
1518 vcpu->kvm->arch.wall_clock = data;
1519 kvm_write_wall_clock(vcpu->kvm, data);
1521 case MSR_KVM_SYSTEM_TIME_NEW:
1522 case MSR_KVM_SYSTEM_TIME: {
1523 kvmclock_reset(vcpu);
1525 vcpu->arch.time = data;
1526 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
1528 /* we verify if the enable bit is set... */
1532 /* ...but clean it before doing the actual write */
1533 vcpu->arch.time_offset = data & ~(PAGE_MASK | 1);
1535 vcpu->arch.time_page =
1536 gfn_to_page(vcpu->kvm, data >> PAGE_SHIFT);
1538 if (is_error_page(vcpu->arch.time_page)) {
1539 kvm_release_page_clean(vcpu->arch.time_page);
1540 vcpu->arch.time_page = NULL;
1544 case MSR_KVM_ASYNC_PF_EN:
1545 if (kvm_pv_enable_async_pf(vcpu, data))
1548 case MSR_IA32_MCG_CTL:
1549 case MSR_IA32_MCG_STATUS:
1550 case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1551 return set_msr_mce(vcpu, msr, data);
1553 /* Performance counters are not protected by a CPUID bit,
1554 * so we should check all of them in the generic path for the sake of
1555 * cross vendor migration.
1556 * Writing a zero into the event select MSRs disables them,
1557 * which we perfectly emulate ;-). Any other value should be at least
1558 * reported, some guests depend on them.
1560 case MSR_P6_EVNTSEL0:
1561 case MSR_P6_EVNTSEL1:
1562 case MSR_K7_EVNTSEL0:
1563 case MSR_K7_EVNTSEL1:
1564 case MSR_K7_EVNTSEL2:
1565 case MSR_K7_EVNTSEL3:
1567 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1568 "0x%x data 0x%llx\n", msr, data);
1570 /* at least RHEL 4 unconditionally writes to the perfctr registers,
1571 * so we ignore writes to make it happy.
1573 case MSR_P6_PERFCTR0:
1574 case MSR_P6_PERFCTR1:
1575 case MSR_K7_PERFCTR0:
1576 case MSR_K7_PERFCTR1:
1577 case MSR_K7_PERFCTR2:
1578 case MSR_K7_PERFCTR3:
1579 pr_unimpl(vcpu, "unimplemented perfctr wrmsr: "
1580 "0x%x data 0x%llx\n", msr, data);
1582 case MSR_K7_CLK_CTL:
1584 * Ignore all writes to this no longer documented MSR.
1585 * Writes are only relevant for old K7 processors,
1586 * all pre-dating SVM, but a recommended workaround from
1587 * AMD for these chips. It is possible to speicify the
1588 * affected processor models on the command line, hence
1589 * the need to ignore the workaround.
1592 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1593 if (kvm_hv_msr_partition_wide(msr)) {
1595 mutex_lock(&vcpu->kvm->lock);
1596 r = set_msr_hyperv_pw(vcpu, msr, data);
1597 mutex_unlock(&vcpu->kvm->lock);
1600 return set_msr_hyperv(vcpu, msr, data);
1602 case MSR_IA32_BBL_CR_CTL3:
1603 /* Drop writes to this legacy MSR -- see rdmsr
1604 * counterpart for further detail.
1606 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
1609 if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
1610 return xen_hvm_config(vcpu, data);
1612 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
1616 pr_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
1623 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1627 * Reads an msr value (of 'msr_index') into 'pdata'.
1628 * Returns 0 on success, non-0 otherwise.
1629 * Assumes vcpu_load() was already called.
1631 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1633 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
1636 static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1638 u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
1640 if (!msr_mtrr_valid(msr))
1643 if (msr == MSR_MTRRdefType)
1644 *pdata = vcpu->arch.mtrr_state.def_type +
1645 (vcpu->arch.mtrr_state.enabled << 10);
1646 else if (msr == MSR_MTRRfix64K_00000)
1648 else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
1649 *pdata = p[1 + msr - MSR_MTRRfix16K_80000];
1650 else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
1651 *pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
1652 else if (msr == MSR_IA32_CR_PAT)
1653 *pdata = vcpu->arch.pat;
1654 else { /* Variable MTRRs */
1655 int idx, is_mtrr_mask;
1658 idx = (msr - 0x200) / 2;
1659 is_mtrr_mask = msr - 0x200 - 2 * idx;
1662 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
1665 (u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
1672 static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1675 u64 mcg_cap = vcpu->arch.mcg_cap;
1676 unsigned bank_num = mcg_cap & 0xff;
1679 case MSR_IA32_P5_MC_ADDR:
1680 case MSR_IA32_P5_MC_TYPE:
1683 case MSR_IA32_MCG_CAP:
1684 data = vcpu->arch.mcg_cap;
1686 case MSR_IA32_MCG_CTL:
1687 if (!(mcg_cap & MCG_CTL_P))
1689 data = vcpu->arch.mcg_ctl;
1691 case MSR_IA32_MCG_STATUS:
1692 data = vcpu->arch.mcg_status;
1695 if (msr >= MSR_IA32_MC0_CTL &&
1696 msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
1697 u32 offset = msr - MSR_IA32_MC0_CTL;
1698 data = vcpu->arch.mce_banks[offset];
1707 static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1710 struct kvm *kvm = vcpu->kvm;
1713 case HV_X64_MSR_GUEST_OS_ID:
1714 data = kvm->arch.hv_guest_os_id;
1716 case HV_X64_MSR_HYPERCALL:
1717 data = kvm->arch.hv_hypercall;
1720 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1728 static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1733 case HV_X64_MSR_VP_INDEX: {
1736 kvm_for_each_vcpu(r, v, vcpu->kvm)
1741 case HV_X64_MSR_EOI:
1742 return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
1743 case HV_X64_MSR_ICR:
1744 return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
1745 case HV_X64_MSR_TPR:
1746 return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
1748 pr_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
1755 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1760 case MSR_IA32_PLATFORM_ID:
1761 case MSR_IA32_UCODE_REV:
1762 case MSR_IA32_EBL_CR_POWERON:
1763 case MSR_IA32_DEBUGCTLMSR:
1764 case MSR_IA32_LASTBRANCHFROMIP:
1765 case MSR_IA32_LASTBRANCHTOIP:
1766 case MSR_IA32_LASTINTFROMIP:
1767 case MSR_IA32_LASTINTTOIP:
1770 case MSR_VM_HSAVE_PA:
1771 case MSR_P6_PERFCTR0:
1772 case MSR_P6_PERFCTR1:
1773 case MSR_P6_EVNTSEL0:
1774 case MSR_P6_EVNTSEL1:
1775 case MSR_K7_EVNTSEL0:
1776 case MSR_K7_PERFCTR0:
1777 case MSR_K8_INT_PENDING_MSG:
1778 case MSR_AMD64_NB_CFG:
1779 case MSR_FAM10H_MMIO_CONF_BASE:
1783 data = 0x500 | KVM_NR_VAR_MTRR;
1785 case 0x200 ... 0x2ff:
1786 return get_msr_mtrr(vcpu, msr, pdata);
1787 case 0xcd: /* fsb frequency */
1791 * MSR_EBC_FREQUENCY_ID
1792 * Conservative value valid for even the basic CPU models.
1793 * Models 0,1: 000 in bits 23:21 indicating a bus speed of
1794 * 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
1795 * and 266MHz for model 3, or 4. Set Core Clock
1796 * Frequency to System Bus Frequency Ratio to 1 (bits
1797 * 31:24) even though these are only valid for CPU
1798 * models > 2, however guests may end up dividing or
1799 * multiplying by zero otherwise.
1801 case MSR_EBC_FREQUENCY_ID:
1804 case MSR_IA32_APICBASE:
1805 data = kvm_get_apic_base(vcpu);
1807 case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
1808 return kvm_x2apic_msr_read(vcpu, msr, pdata);
1810 case MSR_IA32_MISC_ENABLE:
1811 data = vcpu->arch.ia32_misc_enable_msr;
1813 case MSR_IA32_PERF_STATUS:
1814 /* TSC increment by tick */
1816 /* CPU multiplier */
1817 data |= (((uint64_t)4ULL) << 40);
1820 data = vcpu->arch.efer;
1822 case MSR_KVM_WALL_CLOCK:
1823 case MSR_KVM_WALL_CLOCK_NEW:
1824 data = vcpu->kvm->arch.wall_clock;
1826 case MSR_KVM_SYSTEM_TIME:
1827 case MSR_KVM_SYSTEM_TIME_NEW:
1828 data = vcpu->arch.time;
1830 case MSR_KVM_ASYNC_PF_EN:
1831 data = vcpu->arch.apf.msr_val;
1833 case MSR_IA32_P5_MC_ADDR:
1834 case MSR_IA32_P5_MC_TYPE:
1835 case MSR_IA32_MCG_CAP:
1836 case MSR_IA32_MCG_CTL:
1837 case MSR_IA32_MCG_STATUS:
1838 case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
1839 return get_msr_mce(vcpu, msr, pdata);
1840 case MSR_K7_CLK_CTL:
1842 * Provide expected ramp-up count for K7. All other
1843 * are set to zero, indicating minimum divisors for
1846 * This prevents guest kernels on AMD host with CPU
1847 * type 6, model 8 and higher from exploding due to
1848 * the rdmsr failing.
1852 case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
1853 if (kvm_hv_msr_partition_wide(msr)) {
1855 mutex_lock(&vcpu->kvm->lock);
1856 r = get_msr_hyperv_pw(vcpu, msr, pdata);
1857 mutex_unlock(&vcpu->kvm->lock);
1860 return get_msr_hyperv(vcpu, msr, pdata);
1862 case MSR_IA32_BBL_CR_CTL3:
1863 /* This legacy MSR exists but isn't fully documented in current
1864 * silicon. It is however accessed by winxp in very narrow
1865 * scenarios where it sets bit #19, itself documented as
1866 * a "reserved" bit. Best effort attempt to source coherent
1867 * read data here should the balance of the register be
1868 * interpreted by the guest:
1870 * L2 cache control register 3: 64GB range, 256KB size,
1871 * enabled, latency 0x1, configured
1877 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
1880 pr_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
1888 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1891 * Read or write a bunch of msrs. All parameters are kernel addresses.
1893 * @return number of msrs set successfully.
1895 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1896 struct kvm_msr_entry *entries,
1897 int (*do_msr)(struct kvm_vcpu *vcpu,
1898 unsigned index, u64 *data))
1902 idx = srcu_read_lock(&vcpu->kvm->srcu);
1903 for (i = 0; i < msrs->nmsrs; ++i)
1904 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1906 srcu_read_unlock(&vcpu->kvm->srcu, idx);
1912 * Read or write a bunch of msrs. Parameters are user addresses.
1914 * @return number of msrs set successfully.
1916 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1917 int (*do_msr)(struct kvm_vcpu *vcpu,
1918 unsigned index, u64 *data),
1921 struct kvm_msrs msrs;
1922 struct kvm_msr_entry *entries;
1927 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1931 if (msrs.nmsrs >= MAX_IO_MSRS)
1935 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1936 entries = kmalloc(size, GFP_KERNEL);
1941 if (copy_from_user(entries, user_msrs->entries, size))
1944 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1949 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1960 int kvm_dev_ioctl_check_extension(long ext)
1965 case KVM_CAP_IRQCHIP:
1967 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
1968 case KVM_CAP_SET_TSS_ADDR:
1969 case KVM_CAP_EXT_CPUID:
1970 case KVM_CAP_CLOCKSOURCE:
1972 case KVM_CAP_NOP_IO_DELAY:
1973 case KVM_CAP_MP_STATE:
1974 case KVM_CAP_SYNC_MMU:
1975 case KVM_CAP_USER_NMI:
1976 case KVM_CAP_REINJECT_CONTROL:
1977 case KVM_CAP_IRQ_INJECT_STATUS:
1978 case KVM_CAP_ASSIGN_DEV_IRQ:
1980 case KVM_CAP_IOEVENTFD:
1982 case KVM_CAP_PIT_STATE2:
1983 case KVM_CAP_SET_IDENTITY_MAP_ADDR:
1984 case KVM_CAP_XEN_HVM:
1985 case KVM_CAP_ADJUST_CLOCK:
1986 case KVM_CAP_VCPU_EVENTS:
1987 case KVM_CAP_HYPERV:
1988 case KVM_CAP_HYPERV_VAPIC:
1989 case KVM_CAP_HYPERV_SPIN:
1990 case KVM_CAP_PCI_SEGMENT:
1991 case KVM_CAP_DEBUGREGS:
1992 case KVM_CAP_X86_ROBUST_SINGLESTEP:
1994 case KVM_CAP_ASYNC_PF:
1997 case KVM_CAP_COALESCED_MMIO:
1998 r = KVM_COALESCED_MMIO_PAGE_OFFSET;
2001 r = !kvm_x86_ops->cpu_has_accelerated_tpr();
2003 case KVM_CAP_NR_VCPUS:
2006 case KVM_CAP_NR_MEMSLOTS:
2007 r = KVM_MEMORY_SLOTS;
2009 case KVM_CAP_PV_MMU: /* obsolete */
2016 r = KVM_MAX_MCE_BANKS;
2029 long kvm_arch_dev_ioctl(struct file *filp,
2030 unsigned int ioctl, unsigned long arg)
2032 void __user *argp = (void __user *)arg;
2036 case KVM_GET_MSR_INDEX_LIST: {
2037 struct kvm_msr_list __user *user_msr_list = argp;
2038 struct kvm_msr_list msr_list;
2042 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2045 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2046 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2049 if (n < msr_list.nmsrs)
2052 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2053 num_msrs_to_save * sizeof(u32)))
2055 if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
2057 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2062 case KVM_GET_SUPPORTED_CPUID: {
2063 struct kvm_cpuid2 __user *cpuid_arg = argp;
2064 struct kvm_cpuid2 cpuid;
2067 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2069 r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
2070 cpuid_arg->entries);
2075 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2080 case KVM_X86_GET_MCE_CAP_SUPPORTED: {
2083 mce_cap = KVM_MCE_CAP_SUPPORTED;
2085 if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
2097 static void wbinvd_ipi(void *garbage)
2102 static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
2104 return vcpu->kvm->arch.iommu_domain &&
2105 !(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
2108 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
2110 /* Address WBINVD may be executed by guest */
2111 if (need_emulate_wbinvd(vcpu)) {
2112 if (kvm_x86_ops->has_wbinvd_exit())
2113 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
2114 else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
2115 smp_call_function_single(vcpu->cpu,
2116 wbinvd_ipi, NULL, 1);
2119 kvm_x86_ops->vcpu_load(vcpu, cpu);
2120 if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
2121 /* Make sure TSC doesn't go backwards */
2122 s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
2123 native_read_tsc() - vcpu->arch.last_host_tsc;
2125 mark_tsc_unstable("KVM discovered backwards TSC");
2126 if (check_tsc_unstable()) {
2127 kvm_x86_ops->adjust_tsc_offset(vcpu, -tsc_delta);
2128 vcpu->arch.tsc_catchup = 1;
2129 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
2131 if (vcpu->cpu != cpu)
2132 kvm_migrate_timers(vcpu);
2137 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
2139 kvm_x86_ops->vcpu_put(vcpu);
2140 kvm_put_guest_fpu(vcpu);
2141 vcpu->arch.last_host_tsc = native_read_tsc();
2144 static int is_efer_nx(void)
2146 unsigned long long efer = 0;
2148 rdmsrl_safe(MSR_EFER, &efer);
2149 return efer & EFER_NX;
2152 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
2155 struct kvm_cpuid_entry2 *e, *entry;
2158 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
2159 e = &vcpu->arch.cpuid_entries[i];
2160 if (e->function == 0x80000001) {
2165 if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
2166 entry->edx &= ~(1 << 20);
2167 printk(KERN_INFO "kvm: guest NX capability removed\n");
2171 /* when an old userspace process fills a new kernel module */
2172 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
2173 struct kvm_cpuid *cpuid,
2174 struct kvm_cpuid_entry __user *entries)
2177 struct kvm_cpuid_entry *cpuid_entries;
2180 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2183 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
2187 if (copy_from_user(cpuid_entries, entries,
2188 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
2190 for (i = 0; i < cpuid->nent; i++) {
2191 vcpu->arch.cpuid_entries[i].function = cpuid_entries[i].function;
2192 vcpu->arch.cpuid_entries[i].eax = cpuid_entries[i].eax;
2193 vcpu->arch.cpuid_entries[i].ebx = cpuid_entries[i].ebx;
2194 vcpu->arch.cpuid_entries[i].ecx = cpuid_entries[i].ecx;
2195 vcpu->arch.cpuid_entries[i].edx = cpuid_entries[i].edx;
2196 vcpu->arch.cpuid_entries[i].index = 0;
2197 vcpu->arch.cpuid_entries[i].flags = 0;
2198 vcpu->arch.cpuid_entries[i].padding[0] = 0;
2199 vcpu->arch.cpuid_entries[i].padding[1] = 0;
2200 vcpu->arch.cpuid_entries[i].padding[2] = 0;
2202 vcpu->arch.cpuid_nent = cpuid->nent;
2203 cpuid_fix_nx_cap(vcpu);
2205 kvm_apic_set_version(vcpu);
2206 kvm_x86_ops->cpuid_update(vcpu);
2210 vfree(cpuid_entries);
2215 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
2216 struct kvm_cpuid2 *cpuid,
2217 struct kvm_cpuid_entry2 __user *entries)
2222 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2225 if (copy_from_user(&vcpu->arch.cpuid_entries, entries,
2226 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
2228 vcpu->arch.cpuid_nent = cpuid->nent;
2229 kvm_apic_set_version(vcpu);
2230 kvm_x86_ops->cpuid_update(vcpu);
2238 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
2239 struct kvm_cpuid2 *cpuid,
2240 struct kvm_cpuid_entry2 __user *entries)
2245 if (cpuid->nent < vcpu->arch.cpuid_nent)
2248 if (copy_to_user(entries, &vcpu->arch.cpuid_entries,
2249 vcpu->arch.cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
2254 cpuid->nent = vcpu->arch.cpuid_nent;
2258 static void cpuid_mask(u32 *word, int wordnum)
2260 *word &= boot_cpu_data.x86_capability[wordnum];
2263 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
2266 entry->function = function;
2267 entry->index = index;
2268 cpuid_count(entry->function, entry->index,
2269 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
2273 #define F(x) bit(X86_FEATURE_##x)
2275 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
2276 u32 index, int *nent, int maxnent)
2278 unsigned f_nx = is_efer_nx() ? F(NX) : 0;
2279 #ifdef CONFIG_X86_64
2280 unsigned f_gbpages = (kvm_x86_ops->get_lpage_level() == PT_PDPE_LEVEL)
2282 unsigned f_lm = F(LM);
2284 unsigned f_gbpages = 0;
2287 unsigned f_rdtscp = kvm_x86_ops->rdtscp_supported() ? F(RDTSCP) : 0;
2290 const u32 kvm_supported_word0_x86_features =
2291 F(FPU) | F(VME) | F(DE) | F(PSE) |
2292 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
2293 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SEP) |
2294 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
2295 F(PAT) | F(PSE36) | 0 /* PSN */ | F(CLFLSH) |
2296 0 /* Reserved, DS, ACPI */ | F(MMX) |
2297 F(FXSR) | F(XMM) | F(XMM2) | F(SELFSNOOP) |
2298 0 /* HTT, TM, Reserved, PBE */;
2299 /* cpuid 0x80000001.edx */
2300 const u32 kvm_supported_word1_x86_features =
2301 F(FPU) | F(VME) | F(DE) | F(PSE) |
2302 F(TSC) | F(MSR) | F(PAE) | F(MCE) |
2303 F(CX8) | F(APIC) | 0 /* Reserved */ | F(SYSCALL) |
2304 F(MTRR) | F(PGE) | F(MCA) | F(CMOV) |
2305 F(PAT) | F(PSE36) | 0 /* Reserved */ |
2306 f_nx | 0 /* Reserved */ | F(MMXEXT) | F(MMX) |
2307 F(FXSR) | F(FXSR_OPT) | f_gbpages | f_rdtscp |
2308 0 /* Reserved */ | f_lm | F(3DNOWEXT) | F(3DNOW);
2310 const u32 kvm_supported_word4_x86_features =
2311 F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ |
2312 0 /* DS-CPL, VMX, SMX, EST */ |
2313 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ |
2314 0 /* Reserved */ | F(CX16) | 0 /* xTPR Update, PDCM */ |
2315 0 /* Reserved, DCA */ | F(XMM4_1) |
2316 F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) |
2317 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) |
2319 /* cpuid 0x80000001.ecx */
2320 const u32 kvm_supported_word6_x86_features =
2321 F(LAHF_LM) | F(CMP_LEGACY) | 0 /*SVM*/ | 0 /* ExtApicSpace */ |
2322 F(CR8_LEGACY) | F(ABM) | F(SSE4A) | F(MISALIGNSSE) |
2323 F(3DNOWPREFETCH) | 0 /* OSVW */ | 0 /* IBS */ | F(XOP) |
2324 0 /* SKINIT, WDT, LWP */ | F(FMA4) | F(TBM);
2326 /* all calls to cpuid_count() should be made on the same cpu */
2328 do_cpuid_1_ent(entry, function, index);
2333 entry->eax = min(entry->eax, (u32)0xd);
2336 entry->edx &= kvm_supported_word0_x86_features;
2337 cpuid_mask(&entry->edx, 0);
2338 entry->ecx &= kvm_supported_word4_x86_features;
2339 cpuid_mask(&entry->ecx, 4);
2340 /* we support x2apic emulation even if host does not support
2341 * it since we emulate x2apic in software */
2342 entry->ecx |= F(X2APIC);
2344 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
2345 * may return different values. This forces us to get_cpu() before
2346 * issuing the first command, and also to emulate this annoying behavior
2347 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
2349 int t, times = entry->eax & 0xff;
2351 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
2352 entry->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2353 for (t = 1; t < times && *nent < maxnent; ++t) {
2354 do_cpuid_1_ent(&entry[t], function, 0);
2355 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
2360 /* function 4 and 0xb have additional index. */
2364 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2365 /* read more entries until cache_type is zero */
2366 for (i = 1; *nent < maxnent; ++i) {
2367 cache_type = entry[i - 1].eax & 0x1f;
2370 do_cpuid_1_ent(&entry[i], function, i);
2372 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2380 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2381 /* read more entries until level_type is zero */
2382 for (i = 1; *nent < maxnent; ++i) {
2383 level_type = entry[i - 1].ecx & 0xff00;
2386 do_cpuid_1_ent(&entry[i], function, i);
2388 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2396 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2397 for (i = 1; *nent < maxnent; ++i) {
2398 if (entry[i - 1].eax == 0 && i != 2)
2400 do_cpuid_1_ent(&entry[i], function, i);
2402 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
2407 case KVM_CPUID_SIGNATURE: {
2408 char signature[12] = "KVMKVMKVM\0\0";
2409 u32 *sigptr = (u32 *)signature;
2411 entry->ebx = sigptr[0];
2412 entry->ecx = sigptr[1];
2413 entry->edx = sigptr[2];
2416 case KVM_CPUID_FEATURES:
2417 entry->eax = (1 << KVM_FEATURE_CLOCKSOURCE) |
2418 (1 << KVM_FEATURE_NOP_IO_DELAY) |
2419 (1 << KVM_FEATURE_CLOCKSOURCE2) |
2420 (1 << KVM_FEATURE_CLOCKSOURCE_STABLE_BIT);
2426 entry->eax = min(entry->eax, 0x8000001a);
2429 entry->edx &= kvm_supported_word1_x86_features;
2430 cpuid_mask(&entry->edx, 1);
2431 entry->ecx &= kvm_supported_word6_x86_features;
2432 cpuid_mask(&entry->ecx, 6);
2436 kvm_x86_ops->set_supported_cpuid(function, entry);
2443 static int kvm_dev_ioctl_get_supported_cpuid(struct kvm_cpuid2 *cpuid,
2444 struct kvm_cpuid_entry2 __user *entries)
2446 struct kvm_cpuid_entry2 *cpuid_entries;
2447 int limit, nent = 0, r = -E2BIG;
2450 if (cpuid->nent < 1)
2452 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
2453 cpuid->nent = KVM_MAX_CPUID_ENTRIES;
2455 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
2459 do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
2460 limit = cpuid_entries[0].eax;
2461 for (func = 1; func <= limit && nent < cpuid->nent; ++func)
2462 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2463 &nent, cpuid->nent);
2465 if (nent >= cpuid->nent)
2468 do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
2469 limit = cpuid_entries[nent - 1].eax;
2470 for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
2471 do_cpuid_ent(&cpuid_entries[nent], func, 0,
2472 &nent, cpuid->nent);
2477 if (nent >= cpuid->nent)
2480 do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_SIGNATURE, 0, &nent,
2484 if (nent >= cpuid->nent)
2487 do_cpuid_ent(&cpuid_entries[nent], KVM_CPUID_FEATURES, 0, &nent,
2491 if (nent >= cpuid->nent)
2495 if (copy_to_user(entries, cpuid_entries,
2496 nent * sizeof(struct kvm_cpuid_entry2)))
2502 vfree(cpuid_entries);
2507 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
2508 struct kvm_lapic_state *s)
2510 memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
2515 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
2516 struct kvm_lapic_state *s)
2518 memcpy(vcpu->arch.apic->regs, s->regs, sizeof *s);
2519 kvm_apic_post_state_restore(vcpu);
2520 update_cr8_intercept(vcpu);
2525 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
2526 struct kvm_interrupt *irq)
2528 if (irq->irq < 0 || irq->irq >= 256)
2530 if (irqchip_in_kernel(vcpu->kvm))
2533 kvm_queue_interrupt(vcpu, irq->irq, false);
2534 kvm_make_request(KVM_REQ_EVENT, vcpu);
2539 static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
2541 kvm_inject_nmi(vcpu);
2546 static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
2547 struct kvm_tpr_access_ctl *tac)
2551 vcpu->arch.tpr_access_reporting = !!tac->enabled;
2555 static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
2559 unsigned bank_num = mcg_cap & 0xff, bank;
2562 if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
2564 if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
2567 vcpu->arch.mcg_cap = mcg_cap;
2568 /* Init IA32_MCG_CTL to all 1s */
2569 if (mcg_cap & MCG_CTL_P)
2570 vcpu->arch.mcg_ctl = ~(u64)0;
2571 /* Init IA32_MCi_CTL to all 1s */
2572 for (bank = 0; bank < bank_num; bank++)
2573 vcpu->arch.mce_banks[bank*4] = ~(u64)0;
2578 static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
2579 struct kvm_x86_mce *mce)
2581 u64 mcg_cap = vcpu->arch.mcg_cap;
2582 unsigned bank_num = mcg_cap & 0xff;
2583 u64 *banks = vcpu->arch.mce_banks;
2585 if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
2588 * if IA32_MCG_CTL is not all 1s, the uncorrected error
2589 * reporting is disabled
2591 if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
2592 vcpu->arch.mcg_ctl != ~(u64)0)
2594 banks += 4 * mce->bank;
2596 * if IA32_MCi_CTL is not all 1s, the uncorrected error
2597 * reporting is disabled for the bank
2599 if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
2601 if (mce->status & MCI_STATUS_UC) {
2602 if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
2603 !kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
2604 kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
2607 if (banks[1] & MCI_STATUS_VAL)
2608 mce->status |= MCI_STATUS_OVER;
2609 banks[2] = mce->addr;
2610 banks[3] = mce->misc;
2611 vcpu->arch.mcg_status = mce->mcg_status;
2612 banks[1] = mce->status;
2613 kvm_queue_exception(vcpu, MC_VECTOR);
2614 } else if (!(banks[1] & MCI_STATUS_VAL)
2615 || !(banks[1] & MCI_STATUS_UC)) {
2616 if (banks[1] & MCI_STATUS_VAL)
2617 mce->status |= MCI_STATUS_OVER;
2618 banks[2] = mce->addr;
2619 banks[3] = mce->misc;
2620 banks[1] = mce->status;
2622 banks[1] |= MCI_STATUS_OVER;
2626 static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
2627 struct kvm_vcpu_events *events)
2629 events->exception.injected =
2630 vcpu->arch.exception.pending &&
2631 !kvm_exception_is_soft(vcpu->arch.exception.nr);
2632 events->exception.nr = vcpu->arch.exception.nr;
2633 events->exception.has_error_code = vcpu->arch.exception.has_error_code;
2634 events->exception.pad = 0;
2635 events->exception.error_code = vcpu->arch.exception.error_code;
2637 events->interrupt.injected =
2638 vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
2639 events->interrupt.nr = vcpu->arch.interrupt.nr;
2640 events->interrupt.soft = 0;
2641 events->interrupt.shadow =
2642 kvm_x86_ops->get_interrupt_shadow(vcpu,
2643 KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
2645 events->nmi.injected = vcpu->arch.nmi_injected;
2646 events->nmi.pending = vcpu->arch.nmi_pending;
2647 events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
2648 events->nmi.pad = 0;
2650 events->sipi_vector = vcpu->arch.sipi_vector;
2652 events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
2653 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2654 | KVM_VCPUEVENT_VALID_SHADOW);
2655 memset(&events->reserved, 0, sizeof(events->reserved));
2658 static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
2659 struct kvm_vcpu_events *events)
2661 if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
2662 | KVM_VCPUEVENT_VALID_SIPI_VECTOR
2663 | KVM_VCPUEVENT_VALID_SHADOW))
2666 vcpu->arch.exception.pending = events->exception.injected;
2667 vcpu->arch.exception.nr = events->exception.nr;
2668 vcpu->arch.exception.has_error_code = events->exception.has_error_code;
2669 vcpu->arch.exception.error_code = events->exception.error_code;
2671 vcpu->arch.interrupt.pending = events->interrupt.injected;
2672 vcpu->arch.interrupt.nr = events->interrupt.nr;
2673 vcpu->arch.interrupt.soft = events->interrupt.soft;
2674 if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
2675 kvm_x86_ops->set_interrupt_shadow(vcpu,
2676 events->interrupt.shadow);
2678 vcpu->arch.nmi_injected = events->nmi.injected;
2679 if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
2680 vcpu->arch.nmi_pending = events->nmi.pending;
2681 kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
2683 if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR)
2684 vcpu->arch.sipi_vector = events->sipi_vector;
2686 kvm_make_request(KVM_REQ_EVENT, vcpu);
2691 static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
2692 struct kvm_debugregs *dbgregs)
2694 memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
2695 dbgregs->dr6 = vcpu->arch.dr6;
2696 dbgregs->dr7 = vcpu->arch.dr7;
2698 memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
2701 static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
2702 struct kvm_debugregs *dbgregs)
2707 memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
2708 vcpu->arch.dr6 = dbgregs->dr6;
2709 vcpu->arch.dr7 = dbgregs->dr7;
2714 static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
2715 struct kvm_xsave *guest_xsave)
2718 memcpy(guest_xsave->region,
2719 &vcpu->arch.guest_fpu.state->xsave,
2722 memcpy(guest_xsave->region,
2723 &vcpu->arch.guest_fpu.state->fxsave,
2724 sizeof(struct i387_fxsave_struct));
2725 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
2730 static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
2731 struct kvm_xsave *guest_xsave)
2734 *(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
2737 memcpy(&vcpu->arch.guest_fpu.state->xsave,
2738 guest_xsave->region, xstate_size);
2740 if (xstate_bv & ~XSTATE_FPSSE)
2742 memcpy(&vcpu->arch.guest_fpu.state->fxsave,
2743 guest_xsave->region, sizeof(struct i387_fxsave_struct));
2748 static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
2749 struct kvm_xcrs *guest_xcrs)
2751 if (!cpu_has_xsave) {
2752 guest_xcrs->nr_xcrs = 0;
2756 guest_xcrs->nr_xcrs = 1;
2757 guest_xcrs->flags = 0;
2758 guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
2759 guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
2762 static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
2763 struct kvm_xcrs *guest_xcrs)
2770 if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
2773 for (i = 0; i < guest_xcrs->nr_xcrs; i++)
2774 /* Only support XCR0 currently */
2775 if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
2776 r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
2777 guest_xcrs->xcrs[0].value);
2785 long kvm_arch_vcpu_ioctl(struct file *filp,
2786 unsigned int ioctl, unsigned long arg)
2788 struct kvm_vcpu *vcpu = filp->private_data;
2789 void __user *argp = (void __user *)arg;
2792 struct kvm_lapic_state *lapic;
2793 struct kvm_xsave *xsave;
2794 struct kvm_xcrs *xcrs;
2800 case KVM_GET_LAPIC: {
2802 if (!vcpu->arch.apic)
2804 u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2809 r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
2813 if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
2818 case KVM_SET_LAPIC: {
2820 if (!vcpu->arch.apic)
2822 u.lapic = kmalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
2827 if (copy_from_user(u.lapic, argp, sizeof(struct kvm_lapic_state)))
2829 r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
2835 case KVM_INTERRUPT: {
2836 struct kvm_interrupt irq;
2839 if (copy_from_user(&irq, argp, sizeof irq))
2841 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2848 r = kvm_vcpu_ioctl_nmi(vcpu);
2854 case KVM_SET_CPUID: {
2855 struct kvm_cpuid __user *cpuid_arg = argp;
2856 struct kvm_cpuid cpuid;
2859 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2861 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
2866 case KVM_SET_CPUID2: {
2867 struct kvm_cpuid2 __user *cpuid_arg = argp;
2868 struct kvm_cpuid2 cpuid;
2871 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2873 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
2874 cpuid_arg->entries);
2879 case KVM_GET_CPUID2: {
2880 struct kvm_cpuid2 __user *cpuid_arg = argp;
2881 struct kvm_cpuid2 cpuid;
2884 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
2886 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
2887 cpuid_arg->entries);
2891 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
2897 r = msr_io(vcpu, argp, kvm_get_msr, 1);
2900 r = msr_io(vcpu, argp, do_set_msr, 0);
2902 case KVM_TPR_ACCESS_REPORTING: {
2903 struct kvm_tpr_access_ctl tac;
2906 if (copy_from_user(&tac, argp, sizeof tac))
2908 r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
2912 if (copy_to_user(argp, &tac, sizeof tac))
2917 case KVM_SET_VAPIC_ADDR: {
2918 struct kvm_vapic_addr va;
2921 if (!irqchip_in_kernel(vcpu->kvm))
2924 if (copy_from_user(&va, argp, sizeof va))
2927 kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
2930 case KVM_X86_SETUP_MCE: {
2934 if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
2936 r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
2939 case KVM_X86_SET_MCE: {
2940 struct kvm_x86_mce mce;
2943 if (copy_from_user(&mce, argp, sizeof mce))
2945 r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
2948 case KVM_GET_VCPU_EVENTS: {
2949 struct kvm_vcpu_events events;
2951 kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
2954 if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
2959 case KVM_SET_VCPU_EVENTS: {
2960 struct kvm_vcpu_events events;
2963 if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
2966 r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
2969 case KVM_GET_DEBUGREGS: {
2970 struct kvm_debugregs dbgregs;
2972 kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
2975 if (copy_to_user(argp, &dbgregs,
2976 sizeof(struct kvm_debugregs)))
2981 case KVM_SET_DEBUGREGS: {
2982 struct kvm_debugregs dbgregs;
2985 if (copy_from_user(&dbgregs, argp,
2986 sizeof(struct kvm_debugregs)))
2989 r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
2992 case KVM_GET_XSAVE: {
2993 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
2998 kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
3001 if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
3006 case KVM_SET_XSAVE: {
3007 u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
3013 if (copy_from_user(u.xsave, argp, sizeof(struct kvm_xsave)))
3016 r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
3019 case KVM_GET_XCRS: {
3020 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
3025 kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
3028 if (copy_to_user(argp, u.xcrs,
3029 sizeof(struct kvm_xcrs)))
3034 case KVM_SET_XCRS: {
3035 u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
3041 if (copy_from_user(u.xcrs, argp,
3042 sizeof(struct kvm_xcrs)))
3045 r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
3056 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
3060 if (addr > (unsigned int)(-3 * PAGE_SIZE))
3062 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
3066 static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
3069 kvm->arch.ept_identity_map_addr = ident_addr;
3073 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
3074 u32 kvm_nr_mmu_pages)
3076 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
3079 mutex_lock(&kvm->slots_lock);
3080 spin_lock(&kvm->mmu_lock);
3082 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
3083 kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
3085 spin_unlock(&kvm->mmu_lock);
3086 mutex_unlock(&kvm->slots_lock);
3090 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
3092 return kvm->arch.n_max_mmu_pages;
3095 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3100 switch (chip->chip_id) {
3101 case KVM_IRQCHIP_PIC_MASTER:
3102 memcpy(&chip->chip.pic,
3103 &pic_irqchip(kvm)->pics[0],
3104 sizeof(struct kvm_pic_state));
3106 case KVM_IRQCHIP_PIC_SLAVE:
3107 memcpy(&chip->chip.pic,
3108 &pic_irqchip(kvm)->pics[1],
3109 sizeof(struct kvm_pic_state));
3111 case KVM_IRQCHIP_IOAPIC:
3112 r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
3121 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
3126 switch (chip->chip_id) {
3127 case KVM_IRQCHIP_PIC_MASTER:
3128 spin_lock(&pic_irqchip(kvm)->lock);
3129 memcpy(&pic_irqchip(kvm)->pics[0],
3131 sizeof(struct kvm_pic_state));
3132 spin_unlock(&pic_irqchip(kvm)->lock);
3134 case KVM_IRQCHIP_PIC_SLAVE:
3135 spin_lock(&pic_irqchip(kvm)->lock);
3136 memcpy(&pic_irqchip(kvm)->pics[1],
3138 sizeof(struct kvm_pic_state));
3139 spin_unlock(&pic_irqchip(kvm)->lock);
3141 case KVM_IRQCHIP_IOAPIC:
3142 r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
3148 kvm_pic_update_irq(pic_irqchip(kvm));
3152 static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3156 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3157 memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
3158 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3162 static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
3166 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3167 memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
3168 kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
3169 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3173 static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3177 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3178 memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
3179 sizeof(ps->channels));
3180 ps->flags = kvm->arch.vpit->pit_state.flags;
3181 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3182 memset(&ps->reserved, 0, sizeof(ps->reserved));
3186 static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
3188 int r = 0, start = 0;
3189 u32 prev_legacy, cur_legacy;
3190 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3191 prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
3192 cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
3193 if (!prev_legacy && cur_legacy)
3195 memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
3196 sizeof(kvm->arch.vpit->pit_state.channels));
3197 kvm->arch.vpit->pit_state.flags = ps->flags;
3198 kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
3199 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3203 static int kvm_vm_ioctl_reinject(struct kvm *kvm,
3204 struct kvm_reinject_control *control)
3206 if (!kvm->arch.vpit)
3208 mutex_lock(&kvm->arch.vpit->pit_state.lock);
3209 kvm->arch.vpit->pit_state.pit_timer.reinject = control->pit_reinject;
3210 mutex_unlock(&kvm->arch.vpit->pit_state.lock);
3215 * Get (and clear) the dirty memory log for a memory slot.
3217 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
3218 struct kvm_dirty_log *log)
3221 struct kvm_memory_slot *memslot;
3223 unsigned long is_dirty = 0;
3225 mutex_lock(&kvm->slots_lock);
3228 if (log->slot >= KVM_MEMORY_SLOTS)
3231 memslot = &kvm->memslots->memslots[log->slot];
3233 if (!memslot->dirty_bitmap)
3236 n = kvm_dirty_bitmap_bytes(memslot);
3238 for (i = 0; !is_dirty && i < n/sizeof(long); i++)
3239 is_dirty = memslot->dirty_bitmap[i];
3241 /* If nothing is dirty, don't bother messing with page tables. */
3243 struct kvm_memslots *slots, *old_slots;
3244 unsigned long *dirty_bitmap;
3246 dirty_bitmap = memslot->dirty_bitmap_head;
3247 if (memslot->dirty_bitmap == dirty_bitmap)
3248 dirty_bitmap += n / sizeof(long);
3249 memset(dirty_bitmap, 0, n);
3252 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
3255 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
3256 slots->memslots[log->slot].dirty_bitmap = dirty_bitmap;
3257 slots->generation++;
3259 old_slots = kvm->memslots;
3260 rcu_assign_pointer(kvm->memslots, slots);
3261 synchronize_srcu_expedited(&kvm->srcu);
3262 dirty_bitmap = old_slots->memslots[log->slot].dirty_bitmap;
3265 spin_lock(&kvm->mmu_lock);
3266 kvm_mmu_slot_remove_write_access(kvm, log->slot);
3267 spin_unlock(&kvm->mmu_lock);
3270 if (copy_to_user(log->dirty_bitmap, dirty_bitmap, n))
3274 if (clear_user(log->dirty_bitmap, n))
3280 mutex_unlock(&kvm->slots_lock);
3284 long kvm_arch_vm_ioctl(struct file *filp,
3285 unsigned int ioctl, unsigned long arg)
3287 struct kvm *kvm = filp->private_data;
3288 void __user *argp = (void __user *)arg;
3291 * This union makes it completely explicit to gcc-3.x
3292 * that these two variables' stack usage should be
3293 * combined, not added together.
3296 struct kvm_pit_state ps;
3297 struct kvm_pit_state2 ps2;
3298 struct kvm_pit_config pit_config;
3302 case KVM_SET_TSS_ADDR:
3303 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
3307 case KVM_SET_IDENTITY_MAP_ADDR: {
3311 if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
3313 r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
3318 case KVM_SET_NR_MMU_PAGES:
3319 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
3323 case KVM_GET_NR_MMU_PAGES:
3324 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
3326 case KVM_CREATE_IRQCHIP: {
3327 struct kvm_pic *vpic;
3329 mutex_lock(&kvm->lock);
3332 goto create_irqchip_unlock;
3334 vpic = kvm_create_pic(kvm);
3336 r = kvm_ioapic_init(kvm);
3338 mutex_lock(&kvm->slots_lock);
3339 kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
3341 mutex_unlock(&kvm->slots_lock);
3343 goto create_irqchip_unlock;
3346 goto create_irqchip_unlock;
3348 kvm->arch.vpic = vpic;
3350 r = kvm_setup_default_irq_routing(kvm);
3352 mutex_lock(&kvm->slots_lock);
3353 mutex_lock(&kvm->irq_lock);
3354 kvm_ioapic_destroy(kvm);
3355 kvm_destroy_pic(kvm);
3356 mutex_unlock(&kvm->irq_lock);
3357 mutex_unlock(&kvm->slots_lock);
3359 create_irqchip_unlock:
3360 mutex_unlock(&kvm->lock);
3363 case KVM_CREATE_PIT:
3364 u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
3366 case KVM_CREATE_PIT2:
3368 if (copy_from_user(&u.pit_config, argp,
3369 sizeof(struct kvm_pit_config)))
3372 mutex_lock(&kvm->slots_lock);
3375 goto create_pit_unlock;
3377 kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
3381 mutex_unlock(&kvm->slots_lock);
3383 case KVM_IRQ_LINE_STATUS:
3384 case KVM_IRQ_LINE: {
3385 struct kvm_irq_level irq_event;
3388 if (copy_from_user(&irq_event, argp, sizeof irq_event))
3391 if (irqchip_in_kernel(kvm)) {
3393 status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
3394 irq_event.irq, irq_event.level);
3395 if (ioctl == KVM_IRQ_LINE_STATUS) {
3397 irq_event.status = status;
3398 if (copy_to_user(argp, &irq_event,
3406 case KVM_GET_IRQCHIP: {
3407 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3408 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3414 if (copy_from_user(chip, argp, sizeof *chip))
3415 goto get_irqchip_out;
3417 if (!irqchip_in_kernel(kvm))
3418 goto get_irqchip_out;
3419 r = kvm_vm_ioctl_get_irqchip(kvm, chip);
3421 goto get_irqchip_out;
3423 if (copy_to_user(argp, chip, sizeof *chip))
3424 goto get_irqchip_out;
3432 case KVM_SET_IRQCHIP: {
3433 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
3434 struct kvm_irqchip *chip = kmalloc(sizeof(*chip), GFP_KERNEL);
3440 if (copy_from_user(chip, argp, sizeof *chip))
3441 goto set_irqchip_out;
3443 if (!irqchip_in_kernel(kvm))
3444 goto set_irqchip_out;
3445 r = kvm_vm_ioctl_set_irqchip(kvm, chip);
3447 goto set_irqchip_out;
3457 if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
3460 if (!kvm->arch.vpit)
3462 r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
3466 if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
3473 if (copy_from_user(&u.ps, argp, sizeof u.ps))
3476 if (!kvm->arch.vpit)
3478 r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
3484 case KVM_GET_PIT2: {
3486 if (!kvm->arch.vpit)
3488 r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
3492 if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
3497 case KVM_SET_PIT2: {
3499 if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
3502 if (!kvm->arch.vpit)
3504 r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
3510 case KVM_REINJECT_CONTROL: {
3511 struct kvm_reinject_control control;
3513 if (copy_from_user(&control, argp, sizeof(control)))
3515 r = kvm_vm_ioctl_reinject(kvm, &control);
3521 case KVM_XEN_HVM_CONFIG: {
3523 if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
3524 sizeof(struct kvm_xen_hvm_config)))
3527 if (kvm->arch.xen_hvm_config.flags)
3532 case KVM_SET_CLOCK: {
3533 struct kvm_clock_data user_ns;
3538 if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
3546 local_irq_disable();
3547 now_ns = get_kernel_ns();
3548 delta = user_ns.clock - now_ns;
3550 kvm->arch.kvmclock_offset = delta;
3553 case KVM_GET_CLOCK: {
3554 struct kvm_clock_data user_ns;
3557 local_irq_disable();
3558 now_ns = get_kernel_ns();
3559 user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
3562 memset(&user_ns.pad, 0, sizeof(user_ns.pad));
3565 if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
3578 static void kvm_init_msr_list(void)
3583 /* skip the first msrs in the list. KVM-specific */
3584 for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
3585 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
3588 msrs_to_save[j] = msrs_to_save[i];
3591 num_msrs_to_save = j;
3594 static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
3597 if (vcpu->arch.apic &&
3598 !kvm_iodevice_write(&vcpu->arch.apic->dev, addr, len, v))
3601 return kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, len, v);
3604 static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
3606 if (vcpu->arch.apic &&
3607 !kvm_iodevice_read(&vcpu->arch.apic->dev, addr, len, v))
3610 return kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, len, v);
3613 static void kvm_set_segment(struct kvm_vcpu *vcpu,
3614 struct kvm_segment *var, int seg)
3616 kvm_x86_ops->set_segment(vcpu, var, seg);
3619 void kvm_get_segment(struct kvm_vcpu *vcpu,
3620 struct kvm_segment *var, int seg)
3622 kvm_x86_ops->get_segment(vcpu, var, seg);
3625 static gpa_t translate_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3630 static gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
3633 struct x86_exception exception;
3635 BUG_ON(!mmu_is_nested(vcpu));
3637 /* NPT walks are always user-walks */
3638 access |= PFERR_USER_MASK;
3639 t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception);
3644 gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
3645 struct x86_exception *exception)
3647 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3648 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3651 gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
3652 struct x86_exception *exception)
3654 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3655 access |= PFERR_FETCH_MASK;
3656 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3659 gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
3660 struct x86_exception *exception)
3662 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3663 access |= PFERR_WRITE_MASK;
3664 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
3667 /* uses this to access any guest's mapped memory without checking CPL */
3668 gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
3669 struct x86_exception *exception)
3671 return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
3674 static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
3675 struct kvm_vcpu *vcpu, u32 access,
3676 struct x86_exception *exception)
3679 int r = X86EMUL_CONTINUE;
3682 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
3684 unsigned offset = addr & (PAGE_SIZE-1);
3685 unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
3688 if (gpa == UNMAPPED_GVA)
3689 return X86EMUL_PROPAGATE_FAULT;
3690 ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
3692 r = X86EMUL_IO_NEEDED;
3704 /* used for instruction fetching */
3705 static int kvm_fetch_guest_virt(gva_t addr, void *val, unsigned int bytes,
3706 struct kvm_vcpu *vcpu,
3707 struct x86_exception *exception)
3709 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3710 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
3711 access | PFERR_FETCH_MASK,
3715 static int kvm_read_guest_virt(gva_t addr, void *val, unsigned int bytes,
3716 struct kvm_vcpu *vcpu,
3717 struct x86_exception *exception)
3719 u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
3720 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
3724 static int kvm_read_guest_virt_system(gva_t addr, void *val, unsigned int bytes,
3725 struct kvm_vcpu *vcpu,
3726 struct x86_exception *exception)
3728 return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
3731 static int kvm_write_guest_virt_system(gva_t addr, void *val,
3733 struct kvm_vcpu *vcpu,
3734 struct x86_exception *exception)
3737 int r = X86EMUL_CONTINUE;
3740 gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
3743 unsigned offset = addr & (PAGE_SIZE-1);
3744 unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
3747 if (gpa == UNMAPPED_GVA)
3748 return X86EMUL_PROPAGATE_FAULT;
3749 ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
3751 r = X86EMUL_IO_NEEDED;
3763 static int emulator_read_emulated(unsigned long addr,
3766 struct x86_exception *exception,
3767 struct kvm_vcpu *vcpu)
3771 if (vcpu->mmio_read_completed) {
3772 memcpy(val, vcpu->mmio_data, bytes);
3773 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
3774 vcpu->mmio_phys_addr, *(u64 *)val);
3775 vcpu->mmio_read_completed = 0;
3776 return X86EMUL_CONTINUE;
3779 gpa = kvm_mmu_gva_to_gpa_read(vcpu, addr, exception);
3781 if (gpa == UNMAPPED_GVA)
3782 return X86EMUL_PROPAGATE_FAULT;
3784 /* For APIC access vmexit */
3785 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3788 if (kvm_read_guest_virt(addr, val, bytes, vcpu, exception)
3789 == X86EMUL_CONTINUE)
3790 return X86EMUL_CONTINUE;
3794 * Is this MMIO handled locally?
3796 if (!vcpu_mmio_read(vcpu, gpa, bytes, val)) {
3797 trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes, gpa, *(u64 *)val);
3798 return X86EMUL_CONTINUE;
3801 trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
3803 vcpu->mmio_needed = 1;
3804 vcpu->run->exit_reason = KVM_EXIT_MMIO;
3805 vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
3806 vcpu->run->mmio.len = vcpu->mmio_size = bytes;
3807 vcpu->run->mmio.is_write = vcpu->mmio_is_write = 0;
3809 return X86EMUL_IO_NEEDED;
3812 int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
3813 const void *val, int bytes)
3817 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
3820 kvm_mmu_pte_write(vcpu, gpa, val, bytes, 1);
3824 static int emulator_write_emulated_onepage(unsigned long addr,
3827 struct x86_exception *exception,
3828 struct kvm_vcpu *vcpu)
3832 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, exception);
3834 if (gpa == UNMAPPED_GVA)
3835 return X86EMUL_PROPAGATE_FAULT;
3837 /* For APIC access vmexit */
3838 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3841 if (emulator_write_phys(vcpu, gpa, val, bytes))
3842 return X86EMUL_CONTINUE;
3845 trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
3847 * Is this MMIO handled locally?
3849 if (!vcpu_mmio_write(vcpu, gpa, bytes, val))
3850 return X86EMUL_CONTINUE;
3852 vcpu->mmio_needed = 1;
3853 vcpu->run->exit_reason = KVM_EXIT_MMIO;
3854 vcpu->run->mmio.phys_addr = vcpu->mmio_phys_addr = gpa;
3855 vcpu->run->mmio.len = vcpu->mmio_size = bytes;
3856 vcpu->run->mmio.is_write = vcpu->mmio_is_write = 1;
3857 memcpy(vcpu->run->mmio.data, val, bytes);
3859 return X86EMUL_CONTINUE;
3862 int emulator_write_emulated(unsigned long addr,
3865 struct x86_exception *exception,
3866 struct kvm_vcpu *vcpu)
3868 /* Crossing a page boundary? */
3869 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
3872 now = -addr & ~PAGE_MASK;
3873 rc = emulator_write_emulated_onepage(addr, val, now, exception,
3875 if (rc != X86EMUL_CONTINUE)
3881 return emulator_write_emulated_onepage(addr, val, bytes, exception,
3885 #define CMPXCHG_TYPE(t, ptr, old, new) \
3886 (cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
3888 #ifdef CONFIG_X86_64
3889 # define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
3891 # define CMPXCHG64(ptr, old, new) \
3892 (cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
3895 static int emulator_cmpxchg_emulated(unsigned long addr,
3899 struct x86_exception *exception,
3900 struct kvm_vcpu *vcpu)
3907 /* guests cmpxchg8b have to be emulated atomically */
3908 if (bytes > 8 || (bytes & (bytes - 1)))
3911 gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
3913 if (gpa == UNMAPPED_GVA ||
3914 (gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
3917 if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
3920 page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
3921 if (is_error_page(page)) {
3922 kvm_release_page_clean(page);
3926 kaddr = kmap_atomic(page, KM_USER0);
3927 kaddr += offset_in_page(gpa);
3930 exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
3933 exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
3936 exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
3939 exchanged = CMPXCHG64(kaddr, old, new);
3944 kunmap_atomic(kaddr, KM_USER0);
3945 kvm_release_page_dirty(page);
3948 return X86EMUL_CMPXCHG_FAILED;
3950 kvm_mmu_pte_write(vcpu, gpa, new, bytes, 1);
3952 return X86EMUL_CONTINUE;
3955 printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
3957 return emulator_write_emulated(addr, new, bytes, exception, vcpu);
3960 static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
3962 /* TODO: String I/O for in kernel device */
3965 if (vcpu->arch.pio.in)
3966 r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
3967 vcpu->arch.pio.size, pd);
3969 r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
3970 vcpu->arch.pio.port, vcpu->arch.pio.size,
3976 static int emulator_pio_in_emulated(int size, unsigned short port, void *val,
3977 unsigned int count, struct kvm_vcpu *vcpu)
3979 if (vcpu->arch.pio.count)
3982 trace_kvm_pio(0, port, size, count);
3984 vcpu->arch.pio.port = port;
3985 vcpu->arch.pio.in = 1;
3986 vcpu->arch.pio.count = count;
3987 vcpu->arch.pio.size = size;
3989 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
3991 memcpy(val, vcpu->arch.pio_data, size * count);
3992 vcpu->arch.pio.count = 0;
3996 vcpu->run->exit_reason = KVM_EXIT_IO;
3997 vcpu->run->io.direction = KVM_EXIT_IO_IN;
3998 vcpu->run->io.size = size;
3999 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4000 vcpu->run->io.count = count;
4001 vcpu->run->io.port = port;
4006 static int emulator_pio_out_emulated(int size, unsigned short port,
4007 const void *val, unsigned int count,
4008 struct kvm_vcpu *vcpu)
4010 trace_kvm_pio(1, port, size, count);
4012 vcpu->arch.pio.port = port;
4013 vcpu->arch.pio.in = 0;
4014 vcpu->arch.pio.count = count;
4015 vcpu->arch.pio.size = size;
4017 memcpy(vcpu->arch.pio_data, val, size * count);
4019 if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
4020 vcpu->arch.pio.count = 0;
4024 vcpu->run->exit_reason = KVM_EXIT_IO;
4025 vcpu->run->io.direction = KVM_EXIT_IO_OUT;
4026 vcpu->run->io.size = size;
4027 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
4028 vcpu->run->io.count = count;
4029 vcpu->run->io.port = port;
4034 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
4036 return kvm_x86_ops->get_segment_base(vcpu, seg);
4039 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
4041 kvm_mmu_invlpg(vcpu, address);
4042 return X86EMUL_CONTINUE;
4045 int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
4047 if (!need_emulate_wbinvd(vcpu))
4048 return X86EMUL_CONTINUE;
4050 if (kvm_x86_ops->has_wbinvd_exit()) {
4051 int cpu = get_cpu();
4053 cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
4054 smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
4055 wbinvd_ipi, NULL, 1);
4057 cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
4060 return X86EMUL_CONTINUE;
4062 EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
4064 int emulate_clts(struct kvm_vcpu *vcpu)
4066 kvm_x86_ops->set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
4067 kvm_x86_ops->fpu_activate(vcpu);
4068 return X86EMUL_CONTINUE;
4071 int emulator_get_dr(int dr, unsigned long *dest, struct kvm_vcpu *vcpu)
4073 return _kvm_get_dr(vcpu, dr, dest);
4076 int emulator_set_dr(int dr, unsigned long value, struct kvm_vcpu *vcpu)
4079 return __kvm_set_dr(vcpu, dr, value);
4082 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
4084 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
4087 static unsigned long emulator_get_cr(int cr, struct kvm_vcpu *vcpu)
4089 unsigned long value;
4093 value = kvm_read_cr0(vcpu);
4096 value = vcpu->arch.cr2;
4099 value = kvm_read_cr3(vcpu);
4102 value = kvm_read_cr4(vcpu);
4105 value = kvm_get_cr8(vcpu);
4108 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4115 static int emulator_set_cr(int cr, unsigned long val, struct kvm_vcpu *vcpu)
4121 res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
4124 vcpu->arch.cr2 = val;
4127 res = kvm_set_cr3(vcpu, val);
4130 res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
4133 res = kvm_set_cr8(vcpu, val);
4136 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __func__, cr);
4143 static int emulator_get_cpl(struct kvm_vcpu *vcpu)
4145 return kvm_x86_ops->get_cpl(vcpu);
4148 static void emulator_get_gdt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
4150 kvm_x86_ops->get_gdt(vcpu, dt);
4153 static void emulator_get_idt(struct desc_ptr *dt, struct kvm_vcpu *vcpu)
4155 kvm_x86_ops->get_idt(vcpu, dt);
4158 static unsigned long emulator_get_cached_segment_base(int seg,
4159 struct kvm_vcpu *vcpu)
4161 return get_segment_base(vcpu, seg);
4164 static bool emulator_get_cached_descriptor(struct desc_struct *desc, int seg,
4165 struct kvm_vcpu *vcpu)
4167 struct kvm_segment var;
4169 kvm_get_segment(vcpu, &var, seg);
4176 set_desc_limit(desc, var.limit);
4177 set_desc_base(desc, (unsigned long)var.base);
4178 desc->type = var.type;
4180 desc->dpl = var.dpl;
4181 desc->p = var.present;
4182 desc->avl = var.avl;
4190 static void emulator_set_cached_descriptor(struct desc_struct *desc, int seg,
4191 struct kvm_vcpu *vcpu)
4193 struct kvm_segment var;
4195 /* needed to preserve selector */
4196 kvm_get_segment(vcpu, &var, seg);
4198 var.base = get_desc_base(desc);
4199 var.limit = get_desc_limit(desc);
4201 var.limit = (var.limit << 12) | 0xfff;
4202 var.type = desc->type;
4203 var.present = desc->p;
4204 var.dpl = desc->dpl;
4209 var.avl = desc->avl;
4210 var.present = desc->p;
4211 var.unusable = !var.present;
4214 kvm_set_segment(vcpu, &var, seg);
4218 static u16 emulator_get_segment_selector(int seg, struct kvm_vcpu *vcpu)
4220 struct kvm_segment kvm_seg;
4222 kvm_get_segment(vcpu, &kvm_seg, seg);
4223 return kvm_seg.selector;
4226 static void emulator_set_segment_selector(u16 sel, int seg,
4227 struct kvm_vcpu *vcpu)
4229 struct kvm_segment kvm_seg;
4231 kvm_get_segment(vcpu, &kvm_seg, seg);
4232 kvm_seg.selector = sel;
4233 kvm_set_segment(vcpu, &kvm_seg, seg);
4236 static struct x86_emulate_ops emulate_ops = {
4237 .read_std = kvm_read_guest_virt_system,
4238 .write_std = kvm_write_guest_virt_system,
4239 .fetch = kvm_fetch_guest_virt,
4240 .read_emulated = emulator_read_emulated,
4241 .write_emulated = emulator_write_emulated,
4242 .cmpxchg_emulated = emulator_cmpxchg_emulated,
4243 .pio_in_emulated = emulator_pio_in_emulated,
4244 .pio_out_emulated = emulator_pio_out_emulated,
4245 .get_cached_descriptor = emulator_get_cached_descriptor,
4246 .set_cached_descriptor = emulator_set_cached_descriptor,
4247 .get_segment_selector = emulator_get_segment_selector,
4248 .set_segment_selector = emulator_set_segment_selector,
4249 .get_cached_segment_base = emulator_get_cached_segment_base,
4250 .get_gdt = emulator_get_gdt,
4251 .get_idt = emulator_get_idt,
4252 .get_cr = emulator_get_cr,
4253 .set_cr = emulator_set_cr,
4254 .cpl = emulator_get_cpl,
4255 .get_dr = emulator_get_dr,
4256 .set_dr = emulator_set_dr,
4257 .set_msr = kvm_set_msr,
4258 .get_msr = kvm_get_msr,
4261 static void cache_all_regs(struct kvm_vcpu *vcpu)
4263 kvm_register_read(vcpu, VCPU_REGS_RAX);
4264 kvm_register_read(vcpu, VCPU_REGS_RSP);
4265 kvm_register_read(vcpu, VCPU_REGS_RIP);
4266 vcpu->arch.regs_dirty = ~0;
4269 static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
4271 u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
4273 * an sti; sti; sequence only disable interrupts for the first
4274 * instruction. So, if the last instruction, be it emulated or
4275 * not, left the system with the INT_STI flag enabled, it
4276 * means that the last instruction is an sti. We should not
4277 * leave the flag on in this case. The same goes for mov ss
4279 if (!(int_shadow & mask))
4280 kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
4283 static void inject_emulated_exception(struct kvm_vcpu *vcpu)
4285 struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
4286 if (ctxt->exception.vector == PF_VECTOR)
4287 kvm_propagate_fault(vcpu, &ctxt->exception);
4288 else if (ctxt->exception.error_code_valid)
4289 kvm_queue_exception_e(vcpu, ctxt->exception.vector,
4290 ctxt->exception.error_code);
4292 kvm_queue_exception(vcpu, ctxt->exception.vector);
4295 static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
4297 struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
4300 cache_all_regs(vcpu);
4302 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4304 vcpu->arch.emulate_ctxt.vcpu = vcpu;
4305 vcpu->arch.emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
4306 vcpu->arch.emulate_ctxt.eip = kvm_rip_read(vcpu);
4307 vcpu->arch.emulate_ctxt.mode =
4308 (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
4309 (vcpu->arch.emulate_ctxt.eflags & X86_EFLAGS_VM)
4310 ? X86EMUL_MODE_VM86 : cs_l
4311 ? X86EMUL_MODE_PROT64 : cs_db
4312 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
4313 memset(c, 0, sizeof(struct decode_cache));
4314 memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
4317 int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq)
4319 struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
4322 init_emulate_ctxt(vcpu);
4324 vcpu->arch.emulate_ctxt.decode.op_bytes = 2;
4325 vcpu->arch.emulate_ctxt.decode.ad_bytes = 2;
4326 vcpu->arch.emulate_ctxt.decode.eip = vcpu->arch.emulate_ctxt.eip;
4327 ret = emulate_int_real(&vcpu->arch.emulate_ctxt, &emulate_ops, irq);
4329 if (ret != X86EMUL_CONTINUE)
4330 return EMULATE_FAIL;
4332 vcpu->arch.emulate_ctxt.eip = c->eip;
4333 memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
4334 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
4335 kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
4337 if (irq == NMI_VECTOR)
4338 vcpu->arch.nmi_pending = false;
4340 vcpu->arch.interrupt.pending = false;
4342 return EMULATE_DONE;
4344 EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
4346 static int handle_emulation_failure(struct kvm_vcpu *vcpu)
4348 int r = EMULATE_DONE;
4350 ++vcpu->stat.insn_emulation_fail;
4351 trace_kvm_emulate_insn_failed(vcpu);
4352 if (!is_guest_mode(vcpu)) {
4353 vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
4354 vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
4355 vcpu->run->internal.ndata = 0;
4358 kvm_queue_exception(vcpu, UD_VECTOR);
4363 static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t gva)
4371 * if emulation was due to access to shadowed page table
4372 * and it failed try to unshadow page and re-entetr the
4373 * guest to let CPU execute the instruction.
4375 if (kvm_mmu_unprotect_page_virt(vcpu, gva))
4378 gpa = kvm_mmu_gva_to_gpa_system(vcpu, gva, NULL);
4380 if (gpa == UNMAPPED_GVA)
4381 return true; /* let cpu generate fault */
4383 if (!kvm_is_error_hva(gfn_to_hva(vcpu->kvm, gpa >> PAGE_SHIFT)))
4389 int x86_emulate_instruction(struct kvm_vcpu *vcpu,
4396 struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
4398 kvm_clear_exception_queue(vcpu);
4399 vcpu->arch.mmio_fault_cr2 = cr2;
4401 * TODO: fix emulate.c to use guest_read/write_register
4402 * instead of direct ->regs accesses, can save hundred cycles
4403 * on Intel for instructions that don't read/change RSP, for
4406 cache_all_regs(vcpu);
4408 if (!(emulation_type & EMULTYPE_NO_DECODE)) {
4409 init_emulate_ctxt(vcpu);
4410 vcpu->arch.emulate_ctxt.interruptibility = 0;
4411 vcpu->arch.emulate_ctxt.have_exception = false;
4412 vcpu->arch.emulate_ctxt.perm_ok = false;
4414 vcpu->arch.emulate_ctxt.only_vendor_specific_insn
4415 = emulation_type & EMULTYPE_TRAP_UD;
4417 r = x86_decode_insn(&vcpu->arch.emulate_ctxt, insn, insn_len);
4419 trace_kvm_emulate_insn_start(vcpu);
4420 ++vcpu->stat.insn_emulation;
4422 if (emulation_type & EMULTYPE_TRAP_UD)
4423 return EMULATE_FAIL;
4424 if (reexecute_instruction(vcpu, cr2))
4425 return EMULATE_DONE;
4426 if (emulation_type & EMULTYPE_SKIP)
4427 return EMULATE_FAIL;
4428 return handle_emulation_failure(vcpu);
4432 if (emulation_type & EMULTYPE_SKIP) {
4433 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.decode.eip);
4434 return EMULATE_DONE;
4437 /* this is needed for vmware backdor interface to work since it
4438 changes registers values during IO operation */
4439 memcpy(c->regs, vcpu->arch.regs, sizeof c->regs);
4442 r = x86_emulate_insn(&vcpu->arch.emulate_ctxt);
4444 if (r == EMULATION_FAILED) {
4445 if (reexecute_instruction(vcpu, cr2))
4446 return EMULATE_DONE;
4448 return handle_emulation_failure(vcpu);
4451 if (vcpu->arch.emulate_ctxt.have_exception) {
4452 inject_emulated_exception(vcpu);
4454 } else if (vcpu->arch.pio.count) {
4455 if (!vcpu->arch.pio.in)
4456 vcpu->arch.pio.count = 0;
4457 r = EMULATE_DO_MMIO;
4458 } else if (vcpu->mmio_needed) {
4459 if (vcpu->mmio_is_write)
4460 vcpu->mmio_needed = 0;
4461 r = EMULATE_DO_MMIO;
4462 } else if (r == EMULATION_RESTART)
4467 toggle_interruptibility(vcpu, vcpu->arch.emulate_ctxt.interruptibility);
4468 kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
4469 kvm_make_request(KVM_REQ_EVENT, vcpu);
4470 memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
4471 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
4475 EXPORT_SYMBOL_GPL(x86_emulate_instruction);
4477 int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
4479 unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
4480 int ret = emulator_pio_out_emulated(size, port, &val, 1, vcpu);
4481 /* do not return to emulator after return from userspace */
4482 vcpu->arch.pio.count = 0;
4485 EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
4487 static void tsc_bad(void *info)
4489 __this_cpu_write(cpu_tsc_khz, 0);
4492 static void tsc_khz_changed(void *data)
4494 struct cpufreq_freqs *freq = data;
4495 unsigned long khz = 0;
4499 else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4500 khz = cpufreq_quick_get(raw_smp_processor_id());
4503 __this_cpu_write(cpu_tsc_khz, khz);
4506 static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
4509 struct cpufreq_freqs *freq = data;
4511 struct kvm_vcpu *vcpu;
4512 int i, send_ipi = 0;
4515 * We allow guests to temporarily run on slowing clocks,
4516 * provided we notify them after, or to run on accelerating
4517 * clocks, provided we notify them before. Thus time never
4520 * However, we have a problem. We can't atomically update
4521 * the frequency of a given CPU from this function; it is
4522 * merely a notifier, which can be called from any CPU.
4523 * Changing the TSC frequency at arbitrary points in time
4524 * requires a recomputation of local variables related to
4525 * the TSC for each VCPU. We must flag these local variables
4526 * to be updated and be sure the update takes place with the
4527 * new frequency before any guests proceed.
4529 * Unfortunately, the combination of hotplug CPU and frequency
4530 * change creates an intractable locking scenario; the order
4531 * of when these callouts happen is undefined with respect to
4532 * CPU hotplug, and they can race with each other. As such,
4533 * merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
4534 * undefined; you can actually have a CPU frequency change take
4535 * place in between the computation of X and the setting of the
4536 * variable. To protect against this problem, all updates of
4537 * the per_cpu tsc_khz variable are done in an interrupt
4538 * protected IPI, and all callers wishing to update the value
4539 * must wait for a synchronous IPI to complete (which is trivial
4540 * if the caller is on the CPU already). This establishes the
4541 * necessary total order on variable updates.
4543 * Note that because a guest time update may take place
4544 * anytime after the setting of the VCPU's request bit, the
4545 * correct TSC value must be set before the request. However,
4546 * to ensure the update actually makes it to any guest which
4547 * starts running in hardware virtualization between the set
4548 * and the acquisition of the spinlock, we must also ping the
4549 * CPU after setting the request bit.
4553 if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
4555 if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
4558 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4560 raw_spin_lock(&kvm_lock);
4561 list_for_each_entry(kvm, &vm_list, vm_list) {
4562 kvm_for_each_vcpu(i, vcpu, kvm) {
4563 if (vcpu->cpu != freq->cpu)
4565 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
4566 if (vcpu->cpu != smp_processor_id())
4570 raw_spin_unlock(&kvm_lock);
4572 if (freq->old < freq->new && send_ipi) {
4574 * We upscale the frequency. Must make the guest
4575 * doesn't see old kvmclock values while running with
4576 * the new frequency, otherwise we risk the guest sees
4577 * time go backwards.
4579 * In case we update the frequency for another cpu
4580 * (which might be in guest context) send an interrupt
4581 * to kick the cpu out of guest context. Next time
4582 * guest context is entered kvmclock will be updated,
4583 * so the guest will not see stale values.
4585 smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
4590 static struct notifier_block kvmclock_cpufreq_notifier_block = {
4591 .notifier_call = kvmclock_cpufreq_notifier
4594 static int kvmclock_cpu_notifier(struct notifier_block *nfb,
4595 unsigned long action, void *hcpu)
4597 unsigned int cpu = (unsigned long)hcpu;
4601 case CPU_DOWN_FAILED:
4602 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4604 case CPU_DOWN_PREPARE:
4605 smp_call_function_single(cpu, tsc_bad, NULL, 1);
4611 static struct notifier_block kvmclock_cpu_notifier_block = {
4612 .notifier_call = kvmclock_cpu_notifier,
4613 .priority = -INT_MAX
4616 static void kvm_timer_init(void)
4620 max_tsc_khz = tsc_khz;
4621 register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4622 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
4623 #ifdef CONFIG_CPU_FREQ
4624 struct cpufreq_policy policy;
4625 memset(&policy, 0, sizeof(policy));
4627 cpufreq_get_policy(&policy, cpu);
4628 if (policy.cpuinfo.max_freq)
4629 max_tsc_khz = policy.cpuinfo.max_freq;
4632 cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
4633 CPUFREQ_TRANSITION_NOTIFIER);
4635 pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
4636 for_each_online_cpu(cpu)
4637 smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
4640 static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
4642 static int kvm_is_in_guest(void)
4644 return percpu_read(current_vcpu) != NULL;
4647 static int kvm_is_user_mode(void)
4651 if (percpu_read(current_vcpu))
4652 user_mode = kvm_x86_ops->get_cpl(percpu_read(current_vcpu));
4654 return user_mode != 0;
4657 static unsigned long kvm_get_guest_ip(void)
4659 unsigned long ip = 0;
4661 if (percpu_read(current_vcpu))
4662 ip = kvm_rip_read(percpu_read(current_vcpu));
4667 static struct perf_guest_info_callbacks kvm_guest_cbs = {
4668 .is_in_guest = kvm_is_in_guest,
4669 .is_user_mode = kvm_is_user_mode,
4670 .get_guest_ip = kvm_get_guest_ip,
4673 void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
4675 percpu_write(current_vcpu, vcpu);
4677 EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
4679 void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
4681 percpu_write(current_vcpu, NULL);
4683 EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
4685 int kvm_arch_init(void *opaque)
4688 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
4691 printk(KERN_ERR "kvm: already loaded the other module\n");
4696 if (!ops->cpu_has_kvm_support()) {
4697 printk(KERN_ERR "kvm: no hardware support\n");
4701 if (ops->disabled_by_bios()) {
4702 printk(KERN_ERR "kvm: disabled by bios\n");
4707 r = kvm_mmu_module_init();
4711 kvm_init_msr_list();
4714 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
4715 kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
4716 PT_DIRTY_MASK, PT64_NX_MASK, 0);
4720 perf_register_guest_info_callbacks(&kvm_guest_cbs);
4723 host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
4731 void kvm_arch_exit(void)
4733 perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
4735 if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
4736 cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
4737 CPUFREQ_TRANSITION_NOTIFIER);
4738 unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
4740 kvm_mmu_module_exit();
4743 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
4745 ++vcpu->stat.halt_exits;
4746 if (irqchip_in_kernel(vcpu->kvm)) {
4747 vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
4750 vcpu->run->exit_reason = KVM_EXIT_HLT;
4754 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
4756 static inline gpa_t hc_gpa(struct kvm_vcpu *vcpu, unsigned long a0,
4759 if (is_long_mode(vcpu))
4762 return a0 | ((gpa_t)a1 << 32);
4765 int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
4767 u64 param, ingpa, outgpa, ret;
4768 uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
4769 bool fast, longmode;
4773 * hypercall generates UD from non zero cpl and real mode
4776 if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
4777 kvm_queue_exception(vcpu, UD_VECTOR);
4781 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
4782 longmode = is_long_mode(vcpu) && cs_l == 1;
4785 param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
4786 (kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
4787 ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
4788 (kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
4789 outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
4790 (kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
4792 #ifdef CONFIG_X86_64
4794 param = kvm_register_read(vcpu, VCPU_REGS_RCX);
4795 ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
4796 outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
4800 code = param & 0xffff;
4801 fast = (param >> 16) & 0x1;
4802 rep_cnt = (param >> 32) & 0xfff;
4803 rep_idx = (param >> 48) & 0xfff;
4805 trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
4808 case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
4809 kvm_vcpu_on_spin(vcpu);
4812 res = HV_STATUS_INVALID_HYPERCALL_CODE;
4816 ret = res | (((u64)rep_done & 0xfff) << 32);
4818 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
4820 kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
4821 kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
4827 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
4829 unsigned long nr, a0, a1, a2, a3, ret;
4832 if (kvm_hv_hypercall_enabled(vcpu->kvm))
4833 return kvm_hv_hypercall(vcpu);
4835 nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
4836 a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
4837 a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
4838 a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
4839 a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
4841 trace_kvm_hypercall(nr, a0, a1, a2, a3);
4843 if (!is_long_mode(vcpu)) {
4851 if (kvm_x86_ops->get_cpl(vcpu) != 0) {
4857 case KVM_HC_VAPIC_POLL_IRQ:
4861 r = kvm_pv_mmu_op(vcpu, a0, hc_gpa(vcpu, a1, a2), &ret);
4868 kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
4869 ++vcpu->stat.hypercalls;
4872 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
4874 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
4876 char instruction[3];
4877 unsigned long rip = kvm_rip_read(vcpu);
4880 * Blow out the MMU to ensure that no other VCPU has an active mapping
4881 * to ensure that the updated hypercall appears atomically across all
4884 kvm_mmu_zap_all(vcpu->kvm);
4886 kvm_x86_ops->patch_hypercall(vcpu, instruction);
4888 return emulator_write_emulated(rip, instruction, 3, NULL, vcpu);
4891 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
4893 struct desc_ptr dt = { limit, base };
4895 kvm_x86_ops->set_gdt(vcpu, &dt);
4898 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
4900 struct desc_ptr dt = { limit, base };
4902 kvm_x86_ops->set_idt(vcpu, &dt);
4905 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
4907 struct kvm_cpuid_entry2 *e = &vcpu->arch.cpuid_entries[i];
4908 int j, nent = vcpu->arch.cpuid_nent;
4910 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
4911 /* when no next entry is found, the current entry[i] is reselected */
4912 for (j = i + 1; ; j = (j + 1) % nent) {
4913 struct kvm_cpuid_entry2 *ej = &vcpu->arch.cpuid_entries[j];
4914 if (ej->function == e->function) {
4915 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
4919 return 0; /* silence gcc, even though control never reaches here */
4922 /* find an entry with matching function, matching index (if needed), and that
4923 * should be read next (if it's stateful) */
4924 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
4925 u32 function, u32 index)
4927 if (e->function != function)
4929 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
4931 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
4932 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
4937 struct kvm_cpuid_entry2 *kvm_find_cpuid_entry(struct kvm_vcpu *vcpu,
4938 u32 function, u32 index)
4941 struct kvm_cpuid_entry2 *best = NULL;
4943 for (i = 0; i < vcpu->arch.cpuid_nent; ++i) {
4944 struct kvm_cpuid_entry2 *e;
4946 e = &vcpu->arch.cpuid_entries[i];
4947 if (is_matching_cpuid_entry(e, function, index)) {
4948 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
4949 move_to_next_stateful_cpuid_entry(vcpu, i);
4954 * Both basic or both extended?
4956 if (((e->function ^ function) & 0x80000000) == 0)
4957 if (!best || e->function > best->function)
4962 EXPORT_SYMBOL_GPL(kvm_find_cpuid_entry);
4964 int cpuid_maxphyaddr(struct kvm_vcpu *vcpu)
4966 struct kvm_cpuid_entry2 *best;
4968 best = kvm_find_cpuid_entry(vcpu, 0x80000000, 0);
4969 if (!best || best->eax < 0x80000008)
4971 best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0);
4973 return best->eax & 0xff;
4978 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
4980 u32 function, index;
4981 struct kvm_cpuid_entry2 *best;
4983 function = kvm_register_read(vcpu, VCPU_REGS_RAX);
4984 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
4985 kvm_register_write(vcpu, VCPU_REGS_RAX, 0);
4986 kvm_register_write(vcpu, VCPU_REGS_RBX, 0);
4987 kvm_register_write(vcpu, VCPU_REGS_RCX, 0);
4988 kvm_register_write(vcpu, VCPU_REGS_RDX, 0);
4989 best = kvm_find_cpuid_entry(vcpu, function, index);
4991 kvm_register_write(vcpu, VCPU_REGS_RAX, best->eax);
4992 kvm_register_write(vcpu, VCPU_REGS_RBX, best->ebx);
4993 kvm_register_write(vcpu, VCPU_REGS_RCX, best->ecx);
4994 kvm_register_write(vcpu, VCPU_REGS_RDX, best->edx);
4996 kvm_x86_ops->skip_emulated_instruction(vcpu);
4997 trace_kvm_cpuid(function,
4998 kvm_register_read(vcpu, VCPU_REGS_RAX),
4999 kvm_register_read(vcpu, VCPU_REGS_RBX),
5000 kvm_register_read(vcpu, VCPU_REGS_RCX),
5001 kvm_register_read(vcpu, VCPU_REGS_RDX));
5003 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
5006 * Check if userspace requested an interrupt window, and that the
5007 * interrupt window is open.
5009 * No need to exit to userspace if we already have an interrupt queued.
5011 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
5013 return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
5014 vcpu->run->request_interrupt_window &&
5015 kvm_arch_interrupt_allowed(vcpu));
5018 static void post_kvm_run_save(struct kvm_vcpu *vcpu)
5020 struct kvm_run *kvm_run = vcpu->run;
5022 kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
5023 kvm_run->cr8 = kvm_get_cr8(vcpu);
5024 kvm_run->apic_base = kvm_get_apic_base(vcpu);
5025 if (irqchip_in_kernel(vcpu->kvm))
5026 kvm_run->ready_for_interrupt_injection = 1;
5028 kvm_run->ready_for_interrupt_injection =
5029 kvm_arch_interrupt_allowed(vcpu) &&
5030 !kvm_cpu_has_interrupt(vcpu) &&
5031 !kvm_event_needs_reinjection(vcpu);
5034 static void vapic_enter(struct kvm_vcpu *vcpu)
5036 struct kvm_lapic *apic = vcpu->arch.apic;
5039 if (!apic || !apic->vapic_addr)
5042 page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5044 vcpu->arch.apic->vapic_page = page;
5047 static void vapic_exit(struct kvm_vcpu *vcpu)
5049 struct kvm_lapic *apic = vcpu->arch.apic;
5052 if (!apic || !apic->vapic_addr)
5055 idx = srcu_read_lock(&vcpu->kvm->srcu);
5056 kvm_release_page_dirty(apic->vapic_page);
5057 mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
5058 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5061 static void update_cr8_intercept(struct kvm_vcpu *vcpu)
5065 if (!kvm_x86_ops->update_cr8_intercept)
5068 if (!vcpu->arch.apic)
5071 if (!vcpu->arch.apic->vapic_addr)
5072 max_irr = kvm_lapic_find_highest_irr(vcpu);
5079 tpr = kvm_lapic_get_cr8(vcpu);
5081 kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
5084 static void inject_pending_event(struct kvm_vcpu *vcpu)
5086 /* try to reinject previous events if any */
5087 if (vcpu->arch.exception.pending) {
5088 trace_kvm_inj_exception(vcpu->arch.exception.nr,
5089 vcpu->arch.exception.has_error_code,
5090 vcpu->arch.exception.error_code);
5091 kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
5092 vcpu->arch.exception.has_error_code,
5093 vcpu->arch.exception.error_code,
5094 vcpu->arch.exception.reinject);
5098 if (vcpu->arch.nmi_injected) {
5099 kvm_x86_ops->set_nmi(vcpu);
5103 if (vcpu->arch.interrupt.pending) {
5104 kvm_x86_ops->set_irq(vcpu);
5108 /* try to inject new event if pending */
5109 if (vcpu->arch.nmi_pending) {
5110 if (kvm_x86_ops->nmi_allowed(vcpu)) {
5111 vcpu->arch.nmi_pending = false;
5112 vcpu->arch.nmi_injected = true;
5113 kvm_x86_ops->set_nmi(vcpu);
5115 } else if (kvm_cpu_has_interrupt(vcpu)) {
5116 if (kvm_x86_ops->interrupt_allowed(vcpu)) {
5117 kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
5119 kvm_x86_ops->set_irq(vcpu);
5124 static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
5126 if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
5127 !vcpu->guest_xcr0_loaded) {
5128 /* kvm_set_xcr() also depends on this */
5129 xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
5130 vcpu->guest_xcr0_loaded = 1;
5134 static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
5136 if (vcpu->guest_xcr0_loaded) {
5137 if (vcpu->arch.xcr0 != host_xcr0)
5138 xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
5139 vcpu->guest_xcr0_loaded = 0;
5143 static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
5146 bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
5147 vcpu->run->request_interrupt_window;
5149 if (vcpu->requests) {
5150 if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
5151 kvm_mmu_unload(vcpu);
5152 if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
5153 __kvm_migrate_timers(vcpu);
5154 if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
5155 r = kvm_guest_time_update(vcpu);
5159 if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
5160 kvm_mmu_sync_roots(vcpu);
5161 if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
5162 kvm_x86_ops->tlb_flush(vcpu);
5163 if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
5164 vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
5168 if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
5169 vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
5173 if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
5174 vcpu->fpu_active = 0;
5175 kvm_x86_ops->fpu_deactivate(vcpu);
5177 if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
5178 /* Page is swapped out. Do synthetic halt */
5179 vcpu->arch.apf.halted = true;
5183 if (kvm_check_request(KVM_REQ_NMI, vcpu))
5184 vcpu->arch.nmi_pending = true;
5187 r = kvm_mmu_reload(vcpu);
5191 if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
5192 inject_pending_event(vcpu);
5194 /* enable NMI/IRQ window open exits if needed */
5195 if (vcpu->arch.nmi_pending)
5196 kvm_x86_ops->enable_nmi_window(vcpu);
5197 else if (kvm_cpu_has_interrupt(vcpu) || req_int_win)
5198 kvm_x86_ops->enable_irq_window(vcpu);
5200 if (kvm_lapic_enabled(vcpu)) {
5201 update_cr8_intercept(vcpu);
5202 kvm_lapic_sync_to_vapic(vcpu);
5208 kvm_x86_ops->prepare_guest_switch(vcpu);
5209 if (vcpu->fpu_active)
5210 kvm_load_guest_fpu(vcpu);
5211 kvm_load_guest_xcr0(vcpu);
5213 vcpu->mode = IN_GUEST_MODE;
5215 /* We should set ->mode before check ->requests,
5216 * see the comment in make_all_cpus_request.
5220 local_irq_disable();
5222 if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
5223 || need_resched() || signal_pending(current)) {
5224 vcpu->mode = OUTSIDE_GUEST_MODE;
5228 kvm_x86_ops->cancel_injection(vcpu);
5233 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5237 if (unlikely(vcpu->arch.switch_db_regs)) {
5239 set_debugreg(vcpu->arch.eff_db[0], 0);
5240 set_debugreg(vcpu->arch.eff_db[1], 1);
5241 set_debugreg(vcpu->arch.eff_db[2], 2);
5242 set_debugreg(vcpu->arch.eff_db[3], 3);
5245 trace_kvm_entry(vcpu->vcpu_id);
5246 kvm_x86_ops->run(vcpu);
5249 * If the guest has used debug registers, at least dr7
5250 * will be disabled while returning to the host.
5251 * If we don't have active breakpoints in the host, we don't
5252 * care about the messed up debug address registers. But if
5253 * we have some of them active, restore the old state.
5255 if (hw_breakpoint_active())
5256 hw_breakpoint_restore();
5258 kvm_get_msr(vcpu, MSR_IA32_TSC, &vcpu->arch.last_guest_tsc);
5260 vcpu->mode = OUTSIDE_GUEST_MODE;
5267 * We must have an instruction between local_irq_enable() and
5268 * kvm_guest_exit(), so the timer interrupt isn't delayed by
5269 * the interrupt shadow. The stat.exits increment will do nicely.
5270 * But we need to prevent reordering, hence this barrier():
5278 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5281 * Profile KVM exit RIPs:
5283 if (unlikely(prof_on == KVM_PROFILING)) {
5284 unsigned long rip = kvm_rip_read(vcpu);
5285 profile_hit(KVM_PROFILING, (void *)rip);
5289 kvm_lapic_sync_from_vapic(vcpu);
5291 r = kvm_x86_ops->handle_exit(vcpu);
5297 static int __vcpu_run(struct kvm_vcpu *vcpu)
5300 struct kvm *kvm = vcpu->kvm;
5302 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED)) {
5303 pr_debug("vcpu %d received sipi with vector # %x\n",
5304 vcpu->vcpu_id, vcpu->arch.sipi_vector);
5305 kvm_lapic_reset(vcpu);
5306 r = kvm_arch_vcpu_reset(vcpu);
5309 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5312 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5317 if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
5318 !vcpu->arch.apf.halted)
5319 r = vcpu_enter_guest(vcpu);
5321 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5322 kvm_vcpu_block(vcpu);
5323 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5324 if (kvm_check_request(KVM_REQ_UNHALT, vcpu))
5326 switch(vcpu->arch.mp_state) {
5327 case KVM_MP_STATE_HALTED:
5328 vcpu->arch.mp_state =
5329 KVM_MP_STATE_RUNNABLE;
5330 case KVM_MP_STATE_RUNNABLE:
5331 vcpu->arch.apf.halted = false;
5333 case KVM_MP_STATE_SIPI_RECEIVED:
5344 clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
5345 if (kvm_cpu_has_pending_timer(vcpu))
5346 kvm_inject_pending_timer_irqs(vcpu);
5348 if (dm_request_for_irq_injection(vcpu)) {
5350 vcpu->run->exit_reason = KVM_EXIT_INTR;
5351 ++vcpu->stat.request_irq_exits;
5354 kvm_check_async_pf_completion(vcpu);
5356 if (signal_pending(current)) {
5358 vcpu->run->exit_reason = KVM_EXIT_INTR;
5359 ++vcpu->stat.signal_exits;
5361 if (need_resched()) {
5362 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5364 vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
5368 srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
5375 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
5380 if (!tsk_used_math(current) && init_fpu(current))
5383 if (vcpu->sigset_active)
5384 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
5386 if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
5387 kvm_vcpu_block(vcpu);
5388 clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
5393 /* re-sync apic's tpr */
5394 if (!irqchip_in_kernel(vcpu->kvm)) {
5395 if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
5401 if (vcpu->arch.pio.count || vcpu->mmio_needed) {
5402 if (vcpu->mmio_needed) {
5403 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
5404 vcpu->mmio_read_completed = 1;
5405 vcpu->mmio_needed = 0;
5407 vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
5408 r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
5409 srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
5410 if (r != EMULATE_DONE) {
5415 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL)
5416 kvm_register_write(vcpu, VCPU_REGS_RAX,
5417 kvm_run->hypercall.ret);
5419 r = __vcpu_run(vcpu);
5422 post_kvm_run_save(vcpu);
5423 if (vcpu->sigset_active)
5424 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
5429 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5431 regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
5432 regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
5433 regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
5434 regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
5435 regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
5436 regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
5437 regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
5438 regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
5439 #ifdef CONFIG_X86_64
5440 regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
5441 regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
5442 regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
5443 regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
5444 regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
5445 regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
5446 regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
5447 regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
5450 regs->rip = kvm_rip_read(vcpu);
5451 regs->rflags = kvm_get_rflags(vcpu);
5456 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
5458 kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
5459 kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
5460 kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
5461 kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
5462 kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
5463 kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
5464 kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
5465 kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
5466 #ifdef CONFIG_X86_64
5467 kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
5468 kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
5469 kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
5470 kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
5471 kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
5472 kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
5473 kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
5474 kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
5477 kvm_rip_write(vcpu, regs->rip);
5478 kvm_set_rflags(vcpu, regs->rflags);
5480 vcpu->arch.exception.pending = false;
5482 kvm_make_request(KVM_REQ_EVENT, vcpu);
5487 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
5489 struct kvm_segment cs;
5491 kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
5495 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
5497 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
5498 struct kvm_sregs *sregs)
5502 kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5503 kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5504 kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5505 kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5506 kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5507 kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5509 kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5510 kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5512 kvm_x86_ops->get_idt(vcpu, &dt);
5513 sregs->idt.limit = dt.size;
5514 sregs->idt.base = dt.address;
5515 kvm_x86_ops->get_gdt(vcpu, &dt);
5516 sregs->gdt.limit = dt.size;
5517 sregs->gdt.base = dt.address;
5519 sregs->cr0 = kvm_read_cr0(vcpu);
5520 sregs->cr2 = vcpu->arch.cr2;
5521 sregs->cr3 = kvm_read_cr3(vcpu);
5522 sregs->cr4 = kvm_read_cr4(vcpu);
5523 sregs->cr8 = kvm_get_cr8(vcpu);
5524 sregs->efer = vcpu->arch.efer;
5525 sregs->apic_base = kvm_get_apic_base(vcpu);
5527 memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
5529 if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
5530 set_bit(vcpu->arch.interrupt.nr,
5531 (unsigned long *)sregs->interrupt_bitmap);
5536 int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
5537 struct kvm_mp_state *mp_state)
5539 mp_state->mp_state = vcpu->arch.mp_state;
5543 int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
5544 struct kvm_mp_state *mp_state)
5546 vcpu->arch.mp_state = mp_state->mp_state;
5547 kvm_make_request(KVM_REQ_EVENT, vcpu);
5551 int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int reason,
5552 bool has_error_code, u32 error_code)
5554 struct decode_cache *c = &vcpu->arch.emulate_ctxt.decode;
5557 init_emulate_ctxt(vcpu);
5559 ret = emulator_task_switch(&vcpu->arch.emulate_ctxt,
5560 tss_selector, reason, has_error_code,
5564 return EMULATE_FAIL;
5566 memcpy(vcpu->arch.regs, c->regs, sizeof c->regs);
5567 kvm_rip_write(vcpu, vcpu->arch.emulate_ctxt.eip);
5568 kvm_x86_ops->set_rflags(vcpu, vcpu->arch.emulate_ctxt.eflags);
5569 kvm_make_request(KVM_REQ_EVENT, vcpu);
5570 return EMULATE_DONE;
5572 EXPORT_SYMBOL_GPL(kvm_task_switch);
5574 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
5575 struct kvm_sregs *sregs)
5577 int mmu_reset_needed = 0;
5578 int pending_vec, max_bits, idx;
5581 dt.size = sregs->idt.limit;
5582 dt.address = sregs->idt.base;
5583 kvm_x86_ops->set_idt(vcpu, &dt);
5584 dt.size = sregs->gdt.limit;
5585 dt.address = sregs->gdt.base;
5586 kvm_x86_ops->set_gdt(vcpu, &dt);
5588 vcpu->arch.cr2 = sregs->cr2;
5589 mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
5590 vcpu->arch.cr3 = sregs->cr3;
5591 __set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
5593 kvm_set_cr8(vcpu, sregs->cr8);
5595 mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
5596 kvm_x86_ops->set_efer(vcpu, sregs->efer);
5597 kvm_set_apic_base(vcpu, sregs->apic_base);
5599 mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
5600 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
5601 vcpu->arch.cr0 = sregs->cr0;
5603 mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
5604 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
5605 if (sregs->cr4 & X86_CR4_OSXSAVE)
5608 idx = srcu_read_lock(&vcpu->kvm->srcu);
5609 if (!is_long_mode(vcpu) && is_pae(vcpu)) {
5610 load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
5611 mmu_reset_needed = 1;
5613 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5615 if (mmu_reset_needed)
5616 kvm_mmu_reset_context(vcpu);
5618 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
5619 pending_vec = find_first_bit(
5620 (const unsigned long *)sregs->interrupt_bitmap, max_bits);
5621 if (pending_vec < max_bits) {
5622 kvm_queue_interrupt(vcpu, pending_vec, false);
5623 pr_debug("Set back pending irq %d\n", pending_vec);
5626 kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
5627 kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
5628 kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
5629 kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
5630 kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
5631 kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
5633 kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
5634 kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
5636 update_cr8_intercept(vcpu);
5638 /* Older userspace won't unhalt the vcpu on reset. */
5639 if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
5640 sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
5642 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5644 kvm_make_request(KVM_REQ_EVENT, vcpu);
5649 int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
5650 struct kvm_guest_debug *dbg)
5652 unsigned long rflags;
5655 if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
5657 if (vcpu->arch.exception.pending)
5659 if (dbg->control & KVM_GUESTDBG_INJECT_DB)
5660 kvm_queue_exception(vcpu, DB_VECTOR);
5662 kvm_queue_exception(vcpu, BP_VECTOR);
5666 * Read rflags as long as potentially injected trace flags are still
5669 rflags = kvm_get_rflags(vcpu);
5671 vcpu->guest_debug = dbg->control;
5672 if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
5673 vcpu->guest_debug = 0;
5675 if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
5676 for (i = 0; i < KVM_NR_DB_REGS; ++i)
5677 vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
5678 vcpu->arch.switch_db_regs =
5679 (dbg->arch.debugreg[7] & DR7_BP_EN_MASK);
5681 for (i = 0; i < KVM_NR_DB_REGS; i++)
5682 vcpu->arch.eff_db[i] = vcpu->arch.db[i];
5683 vcpu->arch.switch_db_regs = (vcpu->arch.dr7 & DR7_BP_EN_MASK);
5686 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
5687 vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
5688 get_segment_base(vcpu, VCPU_SREG_CS);
5691 * Trigger an rflags update that will inject or remove the trace
5694 kvm_set_rflags(vcpu, rflags);
5696 kvm_x86_ops->set_guest_debug(vcpu, dbg);
5706 * Translate a guest virtual address to a guest physical address.
5708 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
5709 struct kvm_translation *tr)
5711 unsigned long vaddr = tr->linear_address;
5715 idx = srcu_read_lock(&vcpu->kvm->srcu);
5716 gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
5717 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5718 tr->physical_address = gpa;
5719 tr->valid = gpa != UNMAPPED_GVA;
5726 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5728 struct i387_fxsave_struct *fxsave =
5729 &vcpu->arch.guest_fpu.state->fxsave;
5731 memcpy(fpu->fpr, fxsave->st_space, 128);
5732 fpu->fcw = fxsave->cwd;
5733 fpu->fsw = fxsave->swd;
5734 fpu->ftwx = fxsave->twd;
5735 fpu->last_opcode = fxsave->fop;
5736 fpu->last_ip = fxsave->rip;
5737 fpu->last_dp = fxsave->rdp;
5738 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
5743 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
5745 struct i387_fxsave_struct *fxsave =
5746 &vcpu->arch.guest_fpu.state->fxsave;
5748 memcpy(fxsave->st_space, fpu->fpr, 128);
5749 fxsave->cwd = fpu->fcw;
5750 fxsave->swd = fpu->fsw;
5751 fxsave->twd = fpu->ftwx;
5752 fxsave->fop = fpu->last_opcode;
5753 fxsave->rip = fpu->last_ip;
5754 fxsave->rdp = fpu->last_dp;
5755 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
5760 int fx_init(struct kvm_vcpu *vcpu)
5764 err = fpu_alloc(&vcpu->arch.guest_fpu);
5768 fpu_finit(&vcpu->arch.guest_fpu);
5771 * Ensure guest xcr0 is valid for loading
5773 vcpu->arch.xcr0 = XSTATE_FP;
5775 vcpu->arch.cr0 |= X86_CR0_ET;
5779 EXPORT_SYMBOL_GPL(fx_init);
5781 static void fx_free(struct kvm_vcpu *vcpu)
5783 fpu_free(&vcpu->arch.guest_fpu);
5786 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
5788 if (vcpu->guest_fpu_loaded)
5792 * Restore all possible states in the guest,
5793 * and assume host would use all available bits.
5794 * Guest xcr0 would be loaded later.
5796 kvm_put_guest_xcr0(vcpu);
5797 vcpu->guest_fpu_loaded = 1;
5798 unlazy_fpu(current);
5799 fpu_restore_checking(&vcpu->arch.guest_fpu);
5803 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
5805 kvm_put_guest_xcr0(vcpu);
5807 if (!vcpu->guest_fpu_loaded)
5810 vcpu->guest_fpu_loaded = 0;
5811 fpu_save_init(&vcpu->arch.guest_fpu);
5812 ++vcpu->stat.fpu_reload;
5813 kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
5817 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
5819 kvmclock_reset(vcpu);
5821 free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
5823 kvm_x86_ops->vcpu_free(vcpu);
5826 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
5829 if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
5830 printk_once(KERN_WARNING
5831 "kvm: SMP vm created on host with unstable TSC; "
5832 "guest TSC will not be reliable\n");
5833 return kvm_x86_ops->vcpu_create(kvm, id);
5836 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
5840 vcpu->arch.mtrr_state.have_fixed = 1;
5842 r = kvm_arch_vcpu_reset(vcpu);
5844 r = kvm_mmu_setup(vcpu);
5851 kvm_x86_ops->vcpu_free(vcpu);
5855 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
5857 vcpu->arch.apf.msr_val = 0;
5860 kvm_mmu_unload(vcpu);
5864 kvm_x86_ops->vcpu_free(vcpu);
5867 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
5869 vcpu->arch.nmi_pending = false;
5870 vcpu->arch.nmi_injected = false;
5872 vcpu->arch.switch_db_regs = 0;
5873 memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
5874 vcpu->arch.dr6 = DR6_FIXED_1;
5875 vcpu->arch.dr7 = DR7_FIXED_1;
5877 kvm_make_request(KVM_REQ_EVENT, vcpu);
5878 vcpu->arch.apf.msr_val = 0;
5880 kvmclock_reset(vcpu);
5882 kvm_clear_async_pf_completion_queue(vcpu);
5883 kvm_async_pf_hash_reset(vcpu);
5884 vcpu->arch.apf.halted = false;
5886 return kvm_x86_ops->vcpu_reset(vcpu);
5889 int kvm_arch_hardware_enable(void *garbage)
5892 struct kvm_vcpu *vcpu;
5895 kvm_shared_msr_cpu_online();
5896 list_for_each_entry(kvm, &vm_list, vm_list)
5897 kvm_for_each_vcpu(i, vcpu, kvm)
5898 if (vcpu->cpu == smp_processor_id())
5899 kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
5900 return kvm_x86_ops->hardware_enable(garbage);
5903 void kvm_arch_hardware_disable(void *garbage)
5905 kvm_x86_ops->hardware_disable(garbage);
5906 drop_user_return_notifiers(garbage);
5909 int kvm_arch_hardware_setup(void)
5911 return kvm_x86_ops->hardware_setup();
5914 void kvm_arch_hardware_unsetup(void)
5916 kvm_x86_ops->hardware_unsetup();
5919 void kvm_arch_check_processor_compat(void *rtn)
5921 kvm_x86_ops->check_processor_compatibility(rtn);
5924 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
5930 BUG_ON(vcpu->kvm == NULL);
5933 vcpu->arch.emulate_ctxt.ops = &emulate_ops;
5934 vcpu->arch.walk_mmu = &vcpu->arch.mmu;
5935 vcpu->arch.mmu.root_hpa = INVALID_PAGE;
5936 vcpu->arch.mmu.translate_gpa = translate_gpa;
5937 vcpu->arch.nested_mmu.translate_gpa = translate_nested_gpa;
5938 if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
5939 vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
5941 vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
5943 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
5948 vcpu->arch.pio_data = page_address(page);
5950 if (!kvm->arch.virtual_tsc_khz)
5951 kvm_arch_set_tsc_khz(kvm, max_tsc_khz);
5953 r = kvm_mmu_create(vcpu);
5955 goto fail_free_pio_data;
5957 if (irqchip_in_kernel(kvm)) {
5958 r = kvm_create_lapic(vcpu);
5960 goto fail_mmu_destroy;
5963 vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
5965 if (!vcpu->arch.mce_banks) {
5967 goto fail_free_lapic;
5969 vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
5971 if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL))
5972 goto fail_free_mce_banks;
5974 kvm_async_pf_hash_reset(vcpu);
5977 fail_free_mce_banks:
5978 kfree(vcpu->arch.mce_banks);
5980 kvm_free_lapic(vcpu);
5982 kvm_mmu_destroy(vcpu);
5984 free_page((unsigned long)vcpu->arch.pio_data);
5989 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
5993 kfree(vcpu->arch.mce_banks);
5994 kvm_free_lapic(vcpu);
5995 idx = srcu_read_lock(&vcpu->kvm->srcu);
5996 kvm_mmu_destroy(vcpu);
5997 srcu_read_unlock(&vcpu->kvm->srcu, idx);
5998 free_page((unsigned long)vcpu->arch.pio_data);
6001 int kvm_arch_init_vm(struct kvm *kvm)
6003 INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
6004 INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
6006 /* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
6007 set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
6009 raw_spin_lock_init(&kvm->arch.tsc_write_lock);
6014 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
6017 kvm_mmu_unload(vcpu);
6021 static void kvm_free_vcpus(struct kvm *kvm)
6024 struct kvm_vcpu *vcpu;
6027 * Unpin any mmu pages first.
6029 kvm_for_each_vcpu(i, vcpu, kvm) {
6030 kvm_clear_async_pf_completion_queue(vcpu);
6031 kvm_unload_vcpu_mmu(vcpu);
6033 kvm_for_each_vcpu(i, vcpu, kvm)
6034 kvm_arch_vcpu_free(vcpu);
6036 mutex_lock(&kvm->lock);
6037 for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
6038 kvm->vcpus[i] = NULL;
6040 atomic_set(&kvm->online_vcpus, 0);
6041 mutex_unlock(&kvm->lock);
6044 void kvm_arch_sync_events(struct kvm *kvm)
6046 kvm_free_all_assigned_devices(kvm);
6050 void kvm_arch_destroy_vm(struct kvm *kvm)
6052 kvm_iommu_unmap_guest(kvm);
6053 kfree(kvm->arch.vpic);
6054 kfree(kvm->arch.vioapic);
6055 kvm_free_vcpus(kvm);
6056 if (kvm->arch.apic_access_page)
6057 put_page(kvm->arch.apic_access_page);
6058 if (kvm->arch.ept_identity_pagetable)
6059 put_page(kvm->arch.ept_identity_pagetable);
6062 int kvm_arch_prepare_memory_region(struct kvm *kvm,
6063 struct kvm_memory_slot *memslot,
6064 struct kvm_memory_slot old,
6065 struct kvm_userspace_memory_region *mem,
6068 int npages = memslot->npages;
6069 int map_flags = MAP_PRIVATE | MAP_ANONYMOUS;
6071 /* Prevent internal slot pages from being moved by fork()/COW. */
6072 if (memslot->id >= KVM_MEMORY_SLOTS)
6073 map_flags = MAP_SHARED | MAP_ANONYMOUS;
6075 /*To keep backward compatibility with older userspace,
6076 *x86 needs to hanlde !user_alloc case.
6079 if (npages && !old.rmap) {
6080 unsigned long userspace_addr;
6082 down_write(¤t->mm->mmap_sem);
6083 userspace_addr = do_mmap(NULL, 0,
6085 PROT_READ | PROT_WRITE,
6088 up_write(¤t->mm->mmap_sem);
6090 if (IS_ERR((void *)userspace_addr))
6091 return PTR_ERR((void *)userspace_addr);
6093 memslot->userspace_addr = userspace_addr;
6101 void kvm_arch_commit_memory_region(struct kvm *kvm,
6102 struct kvm_userspace_memory_region *mem,
6103 struct kvm_memory_slot old,
6107 int npages = mem->memory_size >> PAGE_SHIFT;
6109 if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
6112 down_write(¤t->mm->mmap_sem);
6113 ret = do_munmap(current->mm, old.userspace_addr,
6114 old.npages * PAGE_SIZE);
6115 up_write(¤t->mm->mmap_sem);
6118 "kvm_vm_ioctl_set_memory_region: "
6119 "failed to munmap memory\n");
6122 spin_lock(&kvm->mmu_lock);
6123 if (!kvm->arch.n_requested_mmu_pages) {
6124 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
6125 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
6128 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
6129 spin_unlock(&kvm->mmu_lock);
6132 void kvm_arch_flush_shadow(struct kvm *kvm)
6134 kvm_mmu_zap_all(kvm);
6135 kvm_reload_remote_mmus(kvm);
6138 int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
6140 return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
6141 !vcpu->arch.apf.halted)
6142 || !list_empty_careful(&vcpu->async_pf.done)
6143 || vcpu->arch.mp_state == KVM_MP_STATE_SIPI_RECEIVED
6144 || vcpu->arch.nmi_pending ||
6145 (kvm_arch_interrupt_allowed(vcpu) &&
6146 kvm_cpu_has_interrupt(vcpu));
6149 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
6152 int cpu = vcpu->cpu;
6154 if (waitqueue_active(&vcpu->wq)) {
6155 wake_up_interruptible(&vcpu->wq);
6156 ++vcpu->stat.halt_wakeup;
6160 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
6161 if (kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE)
6162 smp_send_reschedule(cpu);
6166 int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
6168 return kvm_x86_ops->interrupt_allowed(vcpu);
6171 bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
6173 unsigned long current_rip = kvm_rip_read(vcpu) +
6174 get_segment_base(vcpu, VCPU_SREG_CS);
6176 return current_rip == linear_rip;
6178 EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
6180 unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
6182 unsigned long rflags;
6184 rflags = kvm_x86_ops->get_rflags(vcpu);
6185 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
6186 rflags &= ~X86_EFLAGS_TF;
6189 EXPORT_SYMBOL_GPL(kvm_get_rflags);
6191 void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
6193 if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
6194 kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
6195 rflags |= X86_EFLAGS_TF;
6196 kvm_x86_ops->set_rflags(vcpu, rflags);
6197 kvm_make_request(KVM_REQ_EVENT, vcpu);
6199 EXPORT_SYMBOL_GPL(kvm_set_rflags);
6201 void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
6205 if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
6206 is_error_page(work->page))
6209 r = kvm_mmu_reload(vcpu);
6213 if (!vcpu->arch.mmu.direct_map &&
6214 work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
6217 vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
6220 static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
6222 return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
6225 static inline u32 kvm_async_pf_next_probe(u32 key)
6227 return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
6230 static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6232 u32 key = kvm_async_pf_hash_fn(gfn);
6234 while (vcpu->arch.apf.gfns[key] != ~0)
6235 key = kvm_async_pf_next_probe(key);
6237 vcpu->arch.apf.gfns[key] = gfn;
6240 static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
6243 u32 key = kvm_async_pf_hash_fn(gfn);
6245 for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
6246 (vcpu->arch.apf.gfns[key] != gfn &&
6247 vcpu->arch.apf.gfns[key] != ~0); i++)
6248 key = kvm_async_pf_next_probe(key);
6253 bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6255 return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
6258 static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
6262 i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
6264 vcpu->arch.apf.gfns[i] = ~0;
6266 j = kvm_async_pf_next_probe(j);
6267 if (vcpu->arch.apf.gfns[j] == ~0)
6269 k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
6271 * k lies cyclically in ]i,j]
6273 * |....j i.k.| or |.k..j i...|
6275 } while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
6276 vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
6281 static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
6284 return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
6288 void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
6289 struct kvm_async_pf *work)
6291 struct x86_exception fault;
6293 trace_kvm_async_pf_not_present(work->arch.token, work->gva);
6294 kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
6296 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
6297 (vcpu->arch.apf.send_user_only &&
6298 kvm_x86_ops->get_cpl(vcpu) == 0))
6299 kvm_make_request(KVM_REQ_APF_HALT, vcpu);
6300 else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
6301 fault.vector = PF_VECTOR;
6302 fault.error_code_valid = true;
6303 fault.error_code = 0;
6304 fault.nested_page_fault = false;
6305 fault.address = work->arch.token;
6306 kvm_inject_page_fault(vcpu, &fault);
6310 void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
6311 struct kvm_async_pf *work)
6313 struct x86_exception fault;
6315 trace_kvm_async_pf_ready(work->arch.token, work->gva);
6316 if (is_error_page(work->page))
6317 work->arch.token = ~0; /* broadcast wakeup */
6319 kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
6321 if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
6322 !apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
6323 fault.vector = PF_VECTOR;
6324 fault.error_code_valid = true;
6325 fault.error_code = 0;
6326 fault.nested_page_fault = false;
6327 fault.address = work->arch.token;
6328 kvm_inject_page_fault(vcpu, &fault);
6330 vcpu->arch.apf.halted = false;
6333 bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
6335 if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
6338 return !kvm_event_needs_reinjection(vcpu) &&
6339 kvm_x86_ops->interrupt_allowed(vcpu);
6342 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
6343 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
6344 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
6345 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
6346 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
6347 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
6348 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
6349 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
6350 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
6351 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
6352 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
6353 EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);