2 * Kernel-based Virtual Machine driver for Linux
4 * derived from drivers/kvm/kvm_main.c
6 * Copyright (C) 2006 Qumranet, Inc.
9 * Avi Kivity <avi@qumranet.com>
10 * Yaniv Kamay <yaniv@qumranet.com>
12 * This work is licensed under the terms of the GNU GPL, version 2. See
13 * the COPYING file in the top-level directory.
19 #include "x86_emulate.h"
20 #include "segment_descriptor.h"
23 #include <linux/kvm.h>
25 #include <linux/vmalloc.h>
26 #include <linux/module.h>
27 #include <linux/mman.h>
29 #include <asm/uaccess.h>
32 #define MAX_IO_MSRS 256
33 #define CR0_RESERVED_BITS \
34 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
35 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
36 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
37 #define CR4_RESERVED_BITS \
38 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
39 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
40 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
41 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
43 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
44 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
46 #define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
47 #define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
49 struct kvm_x86_ops *kvm_x86_ops;
51 struct kvm_stats_debugfs_item debugfs_entries[] = {
52 { "pf_fixed", VCPU_STAT(pf_fixed) },
53 { "pf_guest", VCPU_STAT(pf_guest) },
54 { "tlb_flush", VCPU_STAT(tlb_flush) },
55 { "invlpg", VCPU_STAT(invlpg) },
56 { "exits", VCPU_STAT(exits) },
57 { "io_exits", VCPU_STAT(io_exits) },
58 { "mmio_exits", VCPU_STAT(mmio_exits) },
59 { "signal_exits", VCPU_STAT(signal_exits) },
60 { "irq_window", VCPU_STAT(irq_window_exits) },
61 { "halt_exits", VCPU_STAT(halt_exits) },
62 { "halt_wakeup", VCPU_STAT(halt_wakeup) },
63 { "request_irq", VCPU_STAT(request_irq_exits) },
64 { "irq_exits", VCPU_STAT(irq_exits) },
65 { "host_state_reload", VCPU_STAT(host_state_reload) },
66 { "efer_reload", VCPU_STAT(efer_reload) },
67 { "fpu_reload", VCPU_STAT(fpu_reload) },
68 { "insn_emulation", VCPU_STAT(insn_emulation) },
69 { "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
70 { "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
71 { "mmu_pte_write", VM_STAT(mmu_pte_write) },
72 { "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
73 { "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
74 { "mmu_flooded", VM_STAT(mmu_flooded) },
75 { "mmu_recycled", VM_STAT(mmu_recycled) },
76 { "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
81 unsigned long segment_base(u16 selector)
83 struct descriptor_table gdt;
84 struct segment_descriptor *d;
85 unsigned long table_base;
91 asm("sgdt %0" : "=m"(gdt));
92 table_base = gdt.base;
94 if (selector & 4) { /* from ldt */
97 asm("sldt %0" : "=g"(ldt_selector));
98 table_base = segment_base(ldt_selector);
100 d = (struct segment_descriptor *)(table_base + (selector & ~7));
101 v = d->base_low | ((unsigned long)d->base_mid << 16) |
102 ((unsigned long)d->base_high << 24);
104 if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
105 v |= ((unsigned long) \
106 ((struct segment_descriptor_64 *)d)->base_higher) << 32;
110 EXPORT_SYMBOL_GPL(segment_base);
112 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
114 if (irqchip_in_kernel(vcpu->kvm))
115 return vcpu->apic_base;
117 return vcpu->apic_base;
119 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
121 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
123 /* TODO: reserve bits check */
124 if (irqchip_in_kernel(vcpu->kvm))
125 kvm_lapic_set_base(vcpu, data);
127 vcpu->apic_base = data;
129 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
131 static void inject_gp(struct kvm_vcpu *vcpu)
133 kvm_x86_ops->inject_gp(vcpu, 0);
137 * Load the pae pdptrs. Return true is they are all valid.
139 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
141 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
142 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
145 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
147 mutex_lock(&vcpu->kvm->lock);
148 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
149 offset * sizeof(u64), sizeof(pdpte));
154 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
155 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
162 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
164 mutex_unlock(&vcpu->kvm->lock);
169 static bool pdptrs_changed(struct kvm_vcpu *vcpu)
171 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
175 if (is_long_mode(vcpu) || !is_pae(vcpu))
178 mutex_lock(&vcpu->kvm->lock);
179 r = kvm_read_guest(vcpu->kvm, vcpu->cr3 & ~31u, pdpte, sizeof(pdpte));
182 changed = memcmp(pdpte, vcpu->pdptrs, sizeof(pdpte)) != 0;
184 mutex_unlock(&vcpu->kvm->lock);
189 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
191 if (cr0 & CR0_RESERVED_BITS) {
192 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
198 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
199 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
204 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
205 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
206 "and a clear PE flag\n");
211 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
213 if ((vcpu->shadow_efer & EFER_LME)) {
217 printk(KERN_DEBUG "set_cr0: #GP, start paging "
218 "in long mode while PAE is disabled\n");
222 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
224 printk(KERN_DEBUG "set_cr0: #GP, start paging "
225 "in long mode while CS.L == 1\n");
232 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
233 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
241 kvm_x86_ops->set_cr0(vcpu, cr0);
244 mutex_lock(&vcpu->kvm->lock);
245 kvm_mmu_reset_context(vcpu);
246 mutex_unlock(&vcpu->kvm->lock);
249 EXPORT_SYMBOL_GPL(set_cr0);
251 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
253 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
255 EXPORT_SYMBOL_GPL(lmsw);
257 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
259 if (cr4 & CR4_RESERVED_BITS) {
260 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
265 if (is_long_mode(vcpu)) {
266 if (!(cr4 & X86_CR4_PAE)) {
267 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
272 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
273 && !load_pdptrs(vcpu, vcpu->cr3)) {
274 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
279 if (cr4 & X86_CR4_VMXE) {
280 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
284 kvm_x86_ops->set_cr4(vcpu, cr4);
286 mutex_lock(&vcpu->kvm->lock);
287 kvm_mmu_reset_context(vcpu);
288 mutex_unlock(&vcpu->kvm->lock);
290 EXPORT_SYMBOL_GPL(set_cr4);
292 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
294 if (cr3 == vcpu->cr3 && !pdptrs_changed(vcpu)) {
295 kvm_mmu_flush_tlb(vcpu);
299 if (is_long_mode(vcpu)) {
300 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
301 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
307 if (cr3 & CR3_PAE_RESERVED_BITS) {
309 "set_cr3: #GP, reserved bits\n");
313 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
314 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
321 * We don't check reserved bits in nonpae mode, because
322 * this isn't enforced, and VMware depends on this.
326 mutex_lock(&vcpu->kvm->lock);
328 * Does the new cr3 value map to physical memory? (Note, we
329 * catch an invalid cr3 even in real-mode, because it would
330 * cause trouble later on when we turn on paging anyway.)
332 * A real CPU would silently accept an invalid cr3 and would
333 * attempt to use it - with largely undefined (and often hard
334 * to debug) behavior on the guest side.
336 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
340 vcpu->mmu.new_cr3(vcpu);
342 mutex_unlock(&vcpu->kvm->lock);
344 EXPORT_SYMBOL_GPL(set_cr3);
346 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
348 if (cr8 & CR8_RESERVED_BITS) {
349 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
353 if (irqchip_in_kernel(vcpu->kvm))
354 kvm_lapic_set_tpr(vcpu, cr8);
358 EXPORT_SYMBOL_GPL(set_cr8);
360 unsigned long get_cr8(struct kvm_vcpu *vcpu)
362 if (irqchip_in_kernel(vcpu->kvm))
363 return kvm_lapic_get_cr8(vcpu);
367 EXPORT_SYMBOL_GPL(get_cr8);
370 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
371 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
373 * This list is modified at module load time to reflect the
374 * capabilities of the host cpu.
376 static u32 msrs_to_save[] = {
377 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
380 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
382 MSR_IA32_TIME_STAMP_COUNTER,
385 static unsigned num_msrs_to_save;
387 static u32 emulated_msrs[] = {
388 MSR_IA32_MISC_ENABLE,
393 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
395 if (efer & EFER_RESERVED_BITS) {
396 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
403 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
404 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
409 kvm_x86_ops->set_efer(vcpu, efer);
412 efer |= vcpu->shadow_efer & EFER_LMA;
414 vcpu->shadow_efer = efer;
420 * Writes msr value into into the appropriate "register".
421 * Returns 0 on success, non-0 otherwise.
422 * Assumes vcpu_load() was already called.
424 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
426 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
430 * Adapt set_msr() to msr_io()'s calling convention
432 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
434 return kvm_set_msr(vcpu, index, *data);
438 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
443 set_efer(vcpu, data);
446 case MSR_IA32_MC0_STATUS:
447 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
450 case MSR_IA32_MCG_STATUS:
451 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
454 case MSR_IA32_UCODE_REV:
455 case MSR_IA32_UCODE_WRITE:
456 case 0x200 ... 0x2ff: /* MTRRs */
458 case MSR_IA32_APICBASE:
459 kvm_set_apic_base(vcpu, data);
461 case MSR_IA32_MISC_ENABLE:
462 vcpu->ia32_misc_enable_msr = data;
465 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
470 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
474 * Reads an msr value (of 'msr_index') into 'pdata'.
475 * Returns 0 on success, non-0 otherwise.
476 * Assumes vcpu_load() was already called.
478 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
480 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
483 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
488 case 0xc0010010: /* SYSCFG */
489 case 0xc0010015: /* HWCR */
490 case MSR_IA32_PLATFORM_ID:
491 case MSR_IA32_P5_MC_ADDR:
492 case MSR_IA32_P5_MC_TYPE:
493 case MSR_IA32_MC0_CTL:
494 case MSR_IA32_MCG_STATUS:
495 case MSR_IA32_MCG_CAP:
496 case MSR_IA32_MC0_MISC:
497 case MSR_IA32_MC0_MISC+4:
498 case MSR_IA32_MC0_MISC+8:
499 case MSR_IA32_MC0_MISC+12:
500 case MSR_IA32_MC0_MISC+16:
501 case MSR_IA32_UCODE_REV:
502 case MSR_IA32_PERF_STATUS:
503 case MSR_IA32_EBL_CR_POWERON:
506 case 0x200 ... 0x2ff:
509 case 0xcd: /* fsb frequency */
512 case MSR_IA32_APICBASE:
513 data = kvm_get_apic_base(vcpu);
515 case MSR_IA32_MISC_ENABLE:
516 data = vcpu->ia32_misc_enable_msr;
520 data = vcpu->shadow_efer;
524 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
530 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
533 * Read or write a bunch of msrs. All parameters are kernel addresses.
535 * @return number of msrs set successfully.
537 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
538 struct kvm_msr_entry *entries,
539 int (*do_msr)(struct kvm_vcpu *vcpu,
540 unsigned index, u64 *data))
546 for (i = 0; i < msrs->nmsrs; ++i)
547 if (do_msr(vcpu, entries[i].index, &entries[i].data))
556 * Read or write a bunch of msrs. Parameters are user addresses.
558 * @return number of msrs set successfully.
560 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
561 int (*do_msr)(struct kvm_vcpu *vcpu,
562 unsigned index, u64 *data),
565 struct kvm_msrs msrs;
566 struct kvm_msr_entry *entries;
571 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
575 if (msrs.nmsrs >= MAX_IO_MSRS)
579 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
580 entries = vmalloc(size);
585 if (copy_from_user(entries, user_msrs->entries, size))
588 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
593 if (writeback && copy_to_user(user_msrs->entries, entries, size))
605 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
608 void decache_vcpus_on_cpu(int cpu)
611 struct kvm_vcpu *vcpu;
614 spin_lock(&kvm_lock);
615 list_for_each_entry(vm, &vm_list, vm_list)
616 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
621 * If the vcpu is locked, then it is running on some
622 * other cpu and therefore it is not cached on the
625 * If it's not locked, check the last cpu it executed
628 if (mutex_trylock(&vcpu->mutex)) {
629 if (vcpu->cpu == cpu) {
630 kvm_x86_ops->vcpu_decache(vcpu);
633 mutex_unlock(&vcpu->mutex);
636 spin_unlock(&kvm_lock);
639 int kvm_dev_ioctl_check_extension(long ext)
644 case KVM_CAP_IRQCHIP:
646 case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
647 case KVM_CAP_USER_MEMORY:
648 case KVM_CAP_SET_TSS_ADDR:
649 case KVM_CAP_EXT_CPUID:
660 long kvm_arch_dev_ioctl(struct file *filp,
661 unsigned int ioctl, unsigned long arg)
663 void __user *argp = (void __user *)arg;
667 case KVM_GET_MSR_INDEX_LIST: {
668 struct kvm_msr_list __user *user_msr_list = argp;
669 struct kvm_msr_list msr_list;
673 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
676 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
677 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
680 if (n < num_msrs_to_save)
683 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
684 num_msrs_to_save * sizeof(u32)))
686 if (copy_to_user(user_msr_list->indices
687 + num_msrs_to_save * sizeof(u32),
689 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
701 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
703 kvm_x86_ops->vcpu_load(vcpu, cpu);
706 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
708 kvm_x86_ops->vcpu_put(vcpu);
709 kvm_put_guest_fpu(vcpu);
712 static int is_efer_nx(void)
716 rdmsrl(MSR_EFER, efer);
717 return efer & EFER_NX;
720 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
723 struct kvm_cpuid_entry2 *e, *entry;
726 for (i = 0; i < vcpu->cpuid_nent; ++i) {
727 e = &vcpu->cpuid_entries[i];
728 if (e->function == 0x80000001) {
733 if (entry && (entry->edx & (1 << 20)) && !is_efer_nx()) {
734 entry->edx &= ~(1 << 20);
735 printk(KERN_INFO "kvm: guest NX capability removed\n");
739 /* when an old userspace process fills a new kernel module */
740 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
741 struct kvm_cpuid *cpuid,
742 struct kvm_cpuid_entry __user *entries)
745 struct kvm_cpuid_entry *cpuid_entries;
748 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
751 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry) * cpuid->nent);
755 if (copy_from_user(cpuid_entries, entries,
756 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
758 for (i = 0; i < cpuid->nent; i++) {
759 vcpu->cpuid_entries[i].function = cpuid_entries[i].function;
760 vcpu->cpuid_entries[i].eax = cpuid_entries[i].eax;
761 vcpu->cpuid_entries[i].ebx = cpuid_entries[i].ebx;
762 vcpu->cpuid_entries[i].ecx = cpuid_entries[i].ecx;
763 vcpu->cpuid_entries[i].edx = cpuid_entries[i].edx;
764 vcpu->cpuid_entries[i].index = 0;
765 vcpu->cpuid_entries[i].flags = 0;
766 vcpu->cpuid_entries[i].padding[0] = 0;
767 vcpu->cpuid_entries[i].padding[1] = 0;
768 vcpu->cpuid_entries[i].padding[2] = 0;
770 vcpu->cpuid_nent = cpuid->nent;
771 cpuid_fix_nx_cap(vcpu);
775 vfree(cpuid_entries);
780 static int kvm_vcpu_ioctl_set_cpuid2(struct kvm_vcpu *vcpu,
781 struct kvm_cpuid2 *cpuid,
782 struct kvm_cpuid_entry2 __user *entries)
787 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
790 if (copy_from_user(&vcpu->cpuid_entries, entries,
791 cpuid->nent * sizeof(struct kvm_cpuid_entry2)))
793 vcpu->cpuid_nent = cpuid->nent;
800 static int kvm_vcpu_ioctl_get_cpuid2(struct kvm_vcpu *vcpu,
801 struct kvm_cpuid2 *cpuid,
802 struct kvm_cpuid_entry2 __user *entries)
807 if (cpuid->nent < vcpu->cpuid_nent)
810 if (copy_to_user(entries, &vcpu->cpuid_entries,
811 vcpu->cpuid_nent * sizeof(struct kvm_cpuid_entry2)))
816 cpuid->nent = vcpu->cpuid_nent;
820 static inline u32 bit(int bitno)
822 return 1 << (bitno & 31);
825 static void do_cpuid_1_ent(struct kvm_cpuid_entry2 *entry, u32 function,
828 entry->function = function;
829 entry->index = index;
830 cpuid_count(entry->function, entry->index,
831 &entry->eax, &entry->ebx, &entry->ecx, &entry->edx);
835 static void do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function,
836 u32 index, int *nent, int maxnent)
838 const u32 kvm_supported_word0_x86_features = bit(X86_FEATURE_FPU) |
839 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
840 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
841 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
842 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
843 bit(X86_FEATURE_SEP) | bit(X86_FEATURE_PGE) |
844 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
845 bit(X86_FEATURE_CLFLSH) | bit(X86_FEATURE_MMX) |
846 bit(X86_FEATURE_FXSR) | bit(X86_FEATURE_XMM) |
847 bit(X86_FEATURE_XMM2) | bit(X86_FEATURE_SELFSNOOP);
848 const u32 kvm_supported_word1_x86_features = bit(X86_FEATURE_FPU) |
849 bit(X86_FEATURE_VME) | bit(X86_FEATURE_DE) |
850 bit(X86_FEATURE_PSE) | bit(X86_FEATURE_TSC) |
851 bit(X86_FEATURE_MSR) | bit(X86_FEATURE_PAE) |
852 bit(X86_FEATURE_CX8) | bit(X86_FEATURE_APIC) |
853 bit(X86_FEATURE_PGE) |
854 bit(X86_FEATURE_CMOV) | bit(X86_FEATURE_PSE36) |
855 bit(X86_FEATURE_MMX) | bit(X86_FEATURE_FXSR) |
856 bit(X86_FEATURE_SYSCALL) |
857 (bit(X86_FEATURE_NX) && is_efer_nx()) |
859 bit(X86_FEATURE_LM) |
861 bit(X86_FEATURE_MMXEXT) |
862 bit(X86_FEATURE_3DNOWEXT) |
863 bit(X86_FEATURE_3DNOW);
864 const u32 kvm_supported_word3_x86_features =
865 bit(X86_FEATURE_XMM3) | bit(X86_FEATURE_CX16);
866 const u32 kvm_supported_word6_x86_features =
867 bit(X86_FEATURE_LAHF_LM) | bit(X86_FEATURE_CMP_LEGACY);
869 /* all func 2 cpuid_count() should be called on the same cpu */
871 do_cpuid_1_ent(entry, function, index);
876 entry->eax = min(entry->eax, (u32)0xb);
879 entry->edx &= kvm_supported_word0_x86_features;
880 entry->ecx &= kvm_supported_word3_x86_features;
882 /* function 2 entries are STATEFUL. That is, repeated cpuid commands
883 * may return different values. This forces us to get_cpu() before
884 * issuing the first command, and also to emulate this annoying behavior
885 * in kvm_emulate_cpuid() using KVM_CPUID_FLAG_STATE_READ_NEXT */
887 int t, times = entry->eax & 0xff;
889 entry->flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
890 for (t = 1; t < times && *nent < maxnent; ++t) {
891 do_cpuid_1_ent(&entry[t], function, 0);
892 entry[t].flags |= KVM_CPUID_FLAG_STATEFUL_FUNC;
897 /* function 4 and 0xb have additional index. */
899 int index, cache_type;
901 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
902 /* read more entries until cache_type is zero */
903 for (index = 1; *nent < maxnent; ++index) {
904 cache_type = entry[index - 1].eax & 0x1f;
907 do_cpuid_1_ent(&entry[index], function, index);
908 entry[index].flags |=
909 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
915 int index, level_type;
917 entry->flags |= KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
918 /* read more entries until level_type is zero */
919 for (index = 1; *nent < maxnent; ++index) {
920 level_type = entry[index - 1].ecx & 0xff;
923 do_cpuid_1_ent(&entry[index], function, index);
924 entry[index].flags |=
925 KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
931 entry->eax = min(entry->eax, 0x8000001a);
934 entry->edx &= kvm_supported_word1_x86_features;
935 entry->ecx &= kvm_supported_word6_x86_features;
941 static int kvm_vm_ioctl_get_supported_cpuid(struct kvm *kvm,
942 struct kvm_cpuid2 *cpuid,
943 struct kvm_cpuid_entry2 __user *entries)
945 struct kvm_cpuid_entry2 *cpuid_entries;
946 int limit, nent = 0, r = -E2BIG;
952 cpuid_entries = vmalloc(sizeof(struct kvm_cpuid_entry2) * cpuid->nent);
956 do_cpuid_ent(&cpuid_entries[0], 0, 0, &nent, cpuid->nent);
957 limit = cpuid_entries[0].eax;
958 for (func = 1; func <= limit && nent < cpuid->nent; ++func)
959 do_cpuid_ent(&cpuid_entries[nent], func, 0,
962 if (nent >= cpuid->nent)
965 do_cpuid_ent(&cpuid_entries[nent], 0x80000000, 0, &nent, cpuid->nent);
966 limit = cpuid_entries[nent - 1].eax;
967 for (func = 0x80000001; func <= limit && nent < cpuid->nent; ++func)
968 do_cpuid_ent(&cpuid_entries[nent], func, 0,
971 if (copy_to_user(entries, cpuid_entries,
972 nent * sizeof(struct kvm_cpuid_entry2)))
978 vfree(cpuid_entries);
983 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
984 struct kvm_lapic_state *s)
987 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
993 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
994 struct kvm_lapic_state *s)
997 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
998 kvm_apic_post_state_restore(vcpu);
1004 long kvm_arch_vcpu_ioctl(struct file *filp,
1005 unsigned int ioctl, unsigned long arg)
1007 struct kvm_vcpu *vcpu = filp->private_data;
1008 void __user *argp = (void __user *)arg;
1012 case KVM_GET_LAPIC: {
1013 struct kvm_lapic_state lapic;
1015 memset(&lapic, 0, sizeof lapic);
1016 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
1020 if (copy_to_user(argp, &lapic, sizeof lapic))
1025 case KVM_SET_LAPIC: {
1026 struct kvm_lapic_state lapic;
1029 if (copy_from_user(&lapic, argp, sizeof lapic))
1031 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
1037 case KVM_SET_CPUID: {
1038 struct kvm_cpuid __user *cpuid_arg = argp;
1039 struct kvm_cpuid cpuid;
1042 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1044 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
1049 case KVM_SET_CPUID2: {
1050 struct kvm_cpuid2 __user *cpuid_arg = argp;
1051 struct kvm_cpuid2 cpuid;
1054 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1056 r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
1057 cpuid_arg->entries);
1062 case KVM_GET_CPUID2: {
1063 struct kvm_cpuid2 __user *cpuid_arg = argp;
1064 struct kvm_cpuid2 cpuid;
1067 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1069 r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
1070 cpuid_arg->entries);
1074 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1080 r = msr_io(vcpu, argp, kvm_get_msr, 1);
1083 r = msr_io(vcpu, argp, do_set_msr, 0);
1092 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
1096 if (addr > (unsigned int)(-3 * PAGE_SIZE))
1098 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
1102 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
1103 u32 kvm_nr_mmu_pages)
1105 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
1108 mutex_lock(&kvm->lock);
1110 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
1111 kvm->n_requested_mmu_pages = kvm_nr_mmu_pages;
1113 mutex_unlock(&kvm->lock);
1117 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
1119 return kvm->n_alloc_mmu_pages;
1123 * Set a new alias region. Aliases map a portion of physical memory into
1124 * another portion. This is useful for memory windows, for example the PC
1127 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
1128 struct kvm_memory_alias *alias)
1131 struct kvm_mem_alias *p;
1134 /* General sanity checks */
1135 if (alias->memory_size & (PAGE_SIZE - 1))
1137 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
1139 if (alias->slot >= KVM_ALIAS_SLOTS)
1141 if (alias->guest_phys_addr + alias->memory_size
1142 < alias->guest_phys_addr)
1144 if (alias->target_phys_addr + alias->memory_size
1145 < alias->target_phys_addr)
1148 mutex_lock(&kvm->lock);
1150 p = &kvm->aliases[alias->slot];
1151 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
1152 p->npages = alias->memory_size >> PAGE_SHIFT;
1153 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
1155 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
1156 if (kvm->aliases[n - 1].npages)
1160 kvm_mmu_zap_all(kvm);
1162 mutex_unlock(&kvm->lock);
1170 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1175 switch (chip->chip_id) {
1176 case KVM_IRQCHIP_PIC_MASTER:
1177 memcpy(&chip->chip.pic,
1178 &pic_irqchip(kvm)->pics[0],
1179 sizeof(struct kvm_pic_state));
1181 case KVM_IRQCHIP_PIC_SLAVE:
1182 memcpy(&chip->chip.pic,
1183 &pic_irqchip(kvm)->pics[1],
1184 sizeof(struct kvm_pic_state));
1186 case KVM_IRQCHIP_IOAPIC:
1187 memcpy(&chip->chip.ioapic,
1188 ioapic_irqchip(kvm),
1189 sizeof(struct kvm_ioapic_state));
1198 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
1203 switch (chip->chip_id) {
1204 case KVM_IRQCHIP_PIC_MASTER:
1205 memcpy(&pic_irqchip(kvm)->pics[0],
1207 sizeof(struct kvm_pic_state));
1209 case KVM_IRQCHIP_PIC_SLAVE:
1210 memcpy(&pic_irqchip(kvm)->pics[1],
1212 sizeof(struct kvm_pic_state));
1214 case KVM_IRQCHIP_IOAPIC:
1215 memcpy(ioapic_irqchip(kvm),
1217 sizeof(struct kvm_ioapic_state));
1223 kvm_pic_update_irq(pic_irqchip(kvm));
1228 * Get (and clear) the dirty memory log for a memory slot.
1230 int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
1231 struct kvm_dirty_log *log)
1235 struct kvm_memory_slot *memslot;
1238 mutex_lock(&kvm->lock);
1240 r = kvm_get_dirty_log(kvm, log, &is_dirty);
1244 /* If nothing is dirty, don't bother messing with page tables. */
1246 kvm_mmu_slot_remove_write_access(kvm, log->slot);
1247 kvm_flush_remote_tlbs(kvm);
1248 memslot = &kvm->memslots[log->slot];
1249 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1250 memset(memslot->dirty_bitmap, 0, n);
1254 mutex_unlock(&kvm->lock);
1258 long kvm_arch_vm_ioctl(struct file *filp,
1259 unsigned int ioctl, unsigned long arg)
1261 struct kvm *kvm = filp->private_data;
1262 void __user *argp = (void __user *)arg;
1266 case KVM_SET_TSS_ADDR:
1267 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
1271 case KVM_SET_MEMORY_REGION: {
1272 struct kvm_memory_region kvm_mem;
1273 struct kvm_userspace_memory_region kvm_userspace_mem;
1276 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1278 kvm_userspace_mem.slot = kvm_mem.slot;
1279 kvm_userspace_mem.flags = kvm_mem.flags;
1280 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
1281 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
1282 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
1287 case KVM_SET_NR_MMU_PAGES:
1288 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
1292 case KVM_GET_NR_MMU_PAGES:
1293 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
1295 case KVM_SET_MEMORY_ALIAS: {
1296 struct kvm_memory_alias alias;
1299 if (copy_from_user(&alias, argp, sizeof alias))
1301 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
1306 case KVM_CREATE_IRQCHIP:
1308 kvm->vpic = kvm_create_pic(kvm);
1310 r = kvm_ioapic_init(kvm);
1319 case KVM_IRQ_LINE: {
1320 struct kvm_irq_level irq_event;
1323 if (copy_from_user(&irq_event, argp, sizeof irq_event))
1325 if (irqchip_in_kernel(kvm)) {
1326 mutex_lock(&kvm->lock);
1327 if (irq_event.irq < 16)
1328 kvm_pic_set_irq(pic_irqchip(kvm),
1331 kvm_ioapic_set_irq(kvm->vioapic,
1334 mutex_unlock(&kvm->lock);
1339 case KVM_GET_IRQCHIP: {
1340 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1341 struct kvm_irqchip chip;
1344 if (copy_from_user(&chip, argp, sizeof chip))
1347 if (!irqchip_in_kernel(kvm))
1349 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
1353 if (copy_to_user(argp, &chip, sizeof chip))
1358 case KVM_SET_IRQCHIP: {
1359 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
1360 struct kvm_irqchip chip;
1363 if (copy_from_user(&chip, argp, sizeof chip))
1366 if (!irqchip_in_kernel(kvm))
1368 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
1374 case KVM_GET_SUPPORTED_CPUID: {
1375 struct kvm_cpuid2 __user *cpuid_arg = argp;
1376 struct kvm_cpuid2 cpuid;
1379 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
1381 r = kvm_vm_ioctl_get_supported_cpuid(kvm, &cpuid,
1382 cpuid_arg->entries);
1387 if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
1399 static void kvm_init_msr_list(void)
1404 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1405 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1408 msrs_to_save[j] = msrs_to_save[i];
1411 num_msrs_to_save = j;
1415 * Only apic need an MMIO device hook, so shortcut now..
1417 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
1420 struct kvm_io_device *dev;
1423 dev = &vcpu->apic->dev;
1424 if (dev->in_range(dev, addr))
1431 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1434 struct kvm_io_device *dev;
1436 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1438 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1442 int emulator_read_std(unsigned long addr,
1445 struct kvm_vcpu *vcpu)
1450 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1451 unsigned offset = addr & (PAGE_SIZE-1);
1452 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1455 if (gpa == UNMAPPED_GVA)
1456 return X86EMUL_PROPAGATE_FAULT;
1457 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1459 return X86EMUL_UNHANDLEABLE;
1466 return X86EMUL_CONTINUE;
1468 EXPORT_SYMBOL_GPL(emulator_read_std);
1470 static int emulator_read_emulated(unsigned long addr,
1473 struct kvm_vcpu *vcpu)
1475 struct kvm_io_device *mmio_dev;
1478 if (vcpu->mmio_read_completed) {
1479 memcpy(val, vcpu->mmio_data, bytes);
1480 vcpu->mmio_read_completed = 0;
1481 return X86EMUL_CONTINUE;
1484 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1486 /* For APIC access vmexit */
1487 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1490 if (emulator_read_std(addr, val, bytes, vcpu)
1491 == X86EMUL_CONTINUE)
1492 return X86EMUL_CONTINUE;
1493 if (gpa == UNMAPPED_GVA)
1494 return X86EMUL_PROPAGATE_FAULT;
1498 * Is this MMIO handled locally?
1500 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1502 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1503 return X86EMUL_CONTINUE;
1506 vcpu->mmio_needed = 1;
1507 vcpu->mmio_phys_addr = gpa;
1508 vcpu->mmio_size = bytes;
1509 vcpu->mmio_is_write = 0;
1511 return X86EMUL_UNHANDLEABLE;
1514 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1515 const void *val, int bytes)
1519 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1522 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1526 static int emulator_write_emulated_onepage(unsigned long addr,
1529 struct kvm_vcpu *vcpu)
1531 struct kvm_io_device *mmio_dev;
1532 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1534 if (gpa == UNMAPPED_GVA) {
1535 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1536 return X86EMUL_PROPAGATE_FAULT;
1539 /* For APIC access vmexit */
1540 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1543 if (emulator_write_phys(vcpu, gpa, val, bytes))
1544 return X86EMUL_CONTINUE;
1548 * Is this MMIO handled locally?
1550 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1552 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1553 return X86EMUL_CONTINUE;
1556 vcpu->mmio_needed = 1;
1557 vcpu->mmio_phys_addr = gpa;
1558 vcpu->mmio_size = bytes;
1559 vcpu->mmio_is_write = 1;
1560 memcpy(vcpu->mmio_data, val, bytes);
1562 return X86EMUL_CONTINUE;
1565 int emulator_write_emulated(unsigned long addr,
1568 struct kvm_vcpu *vcpu)
1570 /* Crossing a page boundary? */
1571 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1574 now = -addr & ~PAGE_MASK;
1575 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1576 if (rc != X86EMUL_CONTINUE)
1582 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1584 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1586 static int emulator_cmpxchg_emulated(unsigned long addr,
1590 struct kvm_vcpu *vcpu)
1592 static int reported;
1596 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1598 return emulator_write_emulated(addr, new, bytes, vcpu);
1601 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1603 return kvm_x86_ops->get_segment_base(vcpu, seg);
1606 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1608 return X86EMUL_CONTINUE;
1611 int emulate_clts(struct kvm_vcpu *vcpu)
1613 kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
1614 return X86EMUL_CONTINUE;
1617 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1619 struct kvm_vcpu *vcpu = ctxt->vcpu;
1623 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1624 return X86EMUL_CONTINUE;
1626 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1627 return X86EMUL_UNHANDLEABLE;
1631 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1633 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1636 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1638 /* FIXME: better handling */
1639 return X86EMUL_UNHANDLEABLE;
1641 return X86EMUL_CONTINUE;
1644 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1646 static int reported;
1648 unsigned long rip = vcpu->rip;
1649 unsigned long rip_linear;
1651 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1656 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1658 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1659 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1662 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1664 struct x86_emulate_ops emulate_ops = {
1665 .read_std = emulator_read_std,
1666 .read_emulated = emulator_read_emulated,
1667 .write_emulated = emulator_write_emulated,
1668 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1671 int emulate_instruction(struct kvm_vcpu *vcpu,
1672 struct kvm_run *run,
1679 vcpu->mmio_fault_cr2 = cr2;
1680 kvm_x86_ops->cache_regs(vcpu);
1682 vcpu->mmio_is_write = 0;
1683 vcpu->pio.string = 0;
1687 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1689 vcpu->emulate_ctxt.vcpu = vcpu;
1690 vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1691 vcpu->emulate_ctxt.cr2 = cr2;
1692 vcpu->emulate_ctxt.mode =
1693 (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
1694 ? X86EMUL_MODE_REAL : cs_l
1695 ? X86EMUL_MODE_PROT64 : cs_db
1696 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1698 if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1699 vcpu->emulate_ctxt.cs_base = 0;
1700 vcpu->emulate_ctxt.ds_base = 0;
1701 vcpu->emulate_ctxt.es_base = 0;
1702 vcpu->emulate_ctxt.ss_base = 0;
1704 vcpu->emulate_ctxt.cs_base =
1705 get_segment_base(vcpu, VCPU_SREG_CS);
1706 vcpu->emulate_ctxt.ds_base =
1707 get_segment_base(vcpu, VCPU_SREG_DS);
1708 vcpu->emulate_ctxt.es_base =
1709 get_segment_base(vcpu, VCPU_SREG_ES);
1710 vcpu->emulate_ctxt.ss_base =
1711 get_segment_base(vcpu, VCPU_SREG_SS);
1714 vcpu->emulate_ctxt.gs_base =
1715 get_segment_base(vcpu, VCPU_SREG_GS);
1716 vcpu->emulate_ctxt.fs_base =
1717 get_segment_base(vcpu, VCPU_SREG_FS);
1719 r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
1720 ++vcpu->stat.insn_emulation;
1722 ++vcpu->stat.insn_emulation_fail;
1723 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1724 return EMULATE_DONE;
1725 return EMULATE_FAIL;
1729 r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
1731 if (vcpu->pio.string)
1732 return EMULATE_DO_MMIO;
1734 if ((r || vcpu->mmio_is_write) && run) {
1735 run->exit_reason = KVM_EXIT_MMIO;
1736 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1737 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1738 run->mmio.len = vcpu->mmio_size;
1739 run->mmio.is_write = vcpu->mmio_is_write;
1743 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1744 return EMULATE_DONE;
1745 if (!vcpu->mmio_needed) {
1746 kvm_report_emulation_failure(vcpu, "mmio");
1747 return EMULATE_FAIL;
1749 return EMULATE_DO_MMIO;
1752 kvm_x86_ops->decache_regs(vcpu);
1753 kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
1755 if (vcpu->mmio_is_write) {
1756 vcpu->mmio_needed = 0;
1757 return EMULATE_DO_MMIO;
1760 return EMULATE_DONE;
1762 EXPORT_SYMBOL_GPL(emulate_instruction);
1764 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
1768 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
1769 if (vcpu->pio.guest_pages[i]) {
1770 kvm_release_page_dirty(vcpu->pio.guest_pages[i]);
1771 vcpu->pio.guest_pages[i] = NULL;
1775 static int pio_copy_data(struct kvm_vcpu *vcpu)
1777 void *p = vcpu->pio_data;
1780 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1782 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1785 free_pio_guest_pages(vcpu);
1788 q += vcpu->pio.guest_page_offset;
1789 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1791 memcpy(q, p, bytes);
1793 memcpy(p, q, bytes);
1794 q -= vcpu->pio.guest_page_offset;
1796 free_pio_guest_pages(vcpu);
1800 int complete_pio(struct kvm_vcpu *vcpu)
1802 struct kvm_pio_request *io = &vcpu->pio;
1806 kvm_x86_ops->cache_regs(vcpu);
1810 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1814 r = pio_copy_data(vcpu);
1816 kvm_x86_ops->cache_regs(vcpu);
1823 delta *= io->cur_count;
1825 * The size of the register should really depend on
1826 * current address size.
1828 vcpu->regs[VCPU_REGS_RCX] -= delta;
1834 vcpu->regs[VCPU_REGS_RDI] += delta;
1836 vcpu->regs[VCPU_REGS_RSI] += delta;
1839 kvm_x86_ops->decache_regs(vcpu);
1841 io->count -= io->cur_count;
1847 static void kernel_pio(struct kvm_io_device *pio_dev,
1848 struct kvm_vcpu *vcpu,
1851 /* TODO: String I/O for in kernel device */
1853 mutex_lock(&vcpu->kvm->lock);
1855 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1859 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1862 mutex_unlock(&vcpu->kvm->lock);
1865 static void pio_string_write(struct kvm_io_device *pio_dev,
1866 struct kvm_vcpu *vcpu)
1868 struct kvm_pio_request *io = &vcpu->pio;
1869 void *pd = vcpu->pio_data;
1872 mutex_lock(&vcpu->kvm->lock);
1873 for (i = 0; i < io->cur_count; i++) {
1874 kvm_iodevice_write(pio_dev, io->port,
1879 mutex_unlock(&vcpu->kvm->lock);
1882 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1885 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1888 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1889 int size, unsigned port)
1891 struct kvm_io_device *pio_dev;
1893 vcpu->run->exit_reason = KVM_EXIT_IO;
1894 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1895 vcpu->run->io.size = vcpu->pio.size = size;
1896 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1897 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1898 vcpu->run->io.port = vcpu->pio.port = port;
1900 vcpu->pio.string = 0;
1902 vcpu->pio.guest_page_offset = 0;
1905 kvm_x86_ops->cache_regs(vcpu);
1906 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1907 kvm_x86_ops->decache_regs(vcpu);
1909 kvm_x86_ops->skip_emulated_instruction(vcpu);
1911 pio_dev = vcpu_find_pio_dev(vcpu, port);
1913 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1919 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1921 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1922 int size, unsigned long count, int down,
1923 gva_t address, int rep, unsigned port)
1925 unsigned now, in_page;
1929 struct kvm_io_device *pio_dev;
1931 vcpu->run->exit_reason = KVM_EXIT_IO;
1932 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1933 vcpu->run->io.size = vcpu->pio.size = size;
1934 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1935 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1936 vcpu->run->io.port = vcpu->pio.port = port;
1938 vcpu->pio.string = 1;
1939 vcpu->pio.down = down;
1940 vcpu->pio.guest_page_offset = offset_in_page(address);
1941 vcpu->pio.rep = rep;
1944 kvm_x86_ops->skip_emulated_instruction(vcpu);
1949 in_page = PAGE_SIZE - offset_in_page(address);
1951 in_page = offset_in_page(address) + size;
1952 now = min(count, (unsigned long)in_page / size);
1955 * String I/O straddles page boundary. Pin two guest pages
1956 * so that we satisfy atomicity constraints. Do just one
1957 * transaction to avoid complexity.
1964 * String I/O in reverse. Yuck. Kill the guest, fix later.
1966 pr_unimpl(vcpu, "guest string pio down\n");
1970 vcpu->run->io.count = now;
1971 vcpu->pio.cur_count = now;
1973 if (vcpu->pio.cur_count == vcpu->pio.count)
1974 kvm_x86_ops->skip_emulated_instruction(vcpu);
1976 for (i = 0; i < nr_pages; ++i) {
1977 mutex_lock(&vcpu->kvm->lock);
1978 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1979 vcpu->pio.guest_pages[i] = page;
1980 mutex_unlock(&vcpu->kvm->lock);
1983 free_pio_guest_pages(vcpu);
1988 pio_dev = vcpu_find_pio_dev(vcpu, port);
1989 if (!vcpu->pio.in) {
1990 /* string PIO write */
1991 ret = pio_copy_data(vcpu);
1992 if (ret >= 0 && pio_dev) {
1993 pio_string_write(pio_dev, vcpu);
1995 if (vcpu->pio.count == 0)
1999 pr_unimpl(vcpu, "no string pio read support yet, "
2000 "port %x size %d count %ld\n",
2005 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
2007 int kvm_arch_init(void *opaque)
2010 struct kvm_x86_ops *ops = (struct kvm_x86_ops *)opaque;
2012 r = kvm_mmu_module_init();
2016 kvm_init_msr_list();
2019 printk(KERN_ERR "kvm: already loaded the other module\n");
2024 if (!ops->cpu_has_kvm_support()) {
2025 printk(KERN_ERR "kvm: no hardware support\n");
2029 if (ops->disabled_by_bios()) {
2030 printk(KERN_ERR "kvm: disabled by bios\n");
2036 kvm_mmu_set_nonpresent_ptes(0ull, 0ull);
2040 kvm_mmu_module_exit();
2045 void kvm_arch_exit(void)
2048 kvm_mmu_module_exit();
2051 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
2053 ++vcpu->stat.halt_exits;
2054 if (irqchip_in_kernel(vcpu->kvm)) {
2055 vcpu->mp_state = VCPU_MP_STATE_HALTED;
2056 kvm_vcpu_block(vcpu);
2057 if (vcpu->mp_state != VCPU_MP_STATE_RUNNABLE)
2061 vcpu->run->exit_reason = KVM_EXIT_HLT;
2065 EXPORT_SYMBOL_GPL(kvm_emulate_halt);
2067 int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
2069 unsigned long nr, a0, a1, a2, a3, ret;
2071 kvm_x86_ops->cache_regs(vcpu);
2073 nr = vcpu->regs[VCPU_REGS_RAX];
2074 a0 = vcpu->regs[VCPU_REGS_RBX];
2075 a1 = vcpu->regs[VCPU_REGS_RCX];
2076 a2 = vcpu->regs[VCPU_REGS_RDX];
2077 a3 = vcpu->regs[VCPU_REGS_RSI];
2079 if (!is_long_mode(vcpu)) {
2092 vcpu->regs[VCPU_REGS_RAX] = ret;
2093 kvm_x86_ops->decache_regs(vcpu);
2096 EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
2098 int kvm_fix_hypercall(struct kvm_vcpu *vcpu)
2100 char instruction[3];
2103 mutex_lock(&vcpu->kvm->lock);
2106 * Blow out the MMU to ensure that no other VCPU has an active mapping
2107 * to ensure that the updated hypercall appears atomically across all
2110 kvm_mmu_zap_all(vcpu->kvm);
2112 kvm_x86_ops->cache_regs(vcpu);
2113 kvm_x86_ops->patch_hypercall(vcpu, instruction);
2114 if (emulator_write_emulated(vcpu->rip, instruction, 3, vcpu)
2115 != X86EMUL_CONTINUE)
2118 mutex_unlock(&vcpu->kvm->lock);
2123 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
2125 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
2128 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2130 struct descriptor_table dt = { limit, base };
2132 kvm_x86_ops->set_gdt(vcpu, &dt);
2135 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
2137 struct descriptor_table dt = { limit, base };
2139 kvm_x86_ops->set_idt(vcpu, &dt);
2142 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
2143 unsigned long *rflags)
2146 *rflags = kvm_x86_ops->get_rflags(vcpu);
2149 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
2151 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2162 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
2167 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
2168 unsigned long *rflags)
2172 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
2173 *rflags = kvm_x86_ops->get_rflags(vcpu);
2182 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
2185 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
2189 static int move_to_next_stateful_cpuid_entry(struct kvm_vcpu *vcpu, int i)
2191 struct kvm_cpuid_entry2 *e = &vcpu->cpuid_entries[i];
2192 int j, nent = vcpu->cpuid_nent;
2194 e->flags &= ~KVM_CPUID_FLAG_STATE_READ_NEXT;
2195 /* when no next entry is found, the current entry[i] is reselected */
2196 for (j = i + 1; j == i; j = (j + 1) % nent) {
2197 struct kvm_cpuid_entry2 *ej = &vcpu->cpuid_entries[j];
2198 if (ej->function == e->function) {
2199 ej->flags |= KVM_CPUID_FLAG_STATE_READ_NEXT;
2203 return 0; /* silence gcc, even though control never reaches here */
2206 /* find an entry with matching function, matching index (if needed), and that
2207 * should be read next (if it's stateful) */
2208 static int is_matching_cpuid_entry(struct kvm_cpuid_entry2 *e,
2209 u32 function, u32 index)
2211 if (e->function != function)
2213 if ((e->flags & KVM_CPUID_FLAG_SIGNIFCANT_INDEX) && e->index != index)
2215 if ((e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC) &&
2216 !(e->flags & KVM_CPUID_FLAG_STATE_READ_NEXT))
2221 void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
2224 u32 function, index;
2225 struct kvm_cpuid_entry2 *e, *best;
2227 kvm_x86_ops->cache_regs(vcpu);
2228 function = vcpu->regs[VCPU_REGS_RAX];
2229 index = vcpu->regs[VCPU_REGS_RCX];
2230 vcpu->regs[VCPU_REGS_RAX] = 0;
2231 vcpu->regs[VCPU_REGS_RBX] = 0;
2232 vcpu->regs[VCPU_REGS_RCX] = 0;
2233 vcpu->regs[VCPU_REGS_RDX] = 0;
2235 for (i = 0; i < vcpu->cpuid_nent; ++i) {
2236 e = &vcpu->cpuid_entries[i];
2237 if (is_matching_cpuid_entry(e, function, index)) {
2238 if (e->flags & KVM_CPUID_FLAG_STATEFUL_FUNC)
2239 move_to_next_stateful_cpuid_entry(vcpu, i);
2244 * Both basic or both extended?
2246 if (((e->function ^ function) & 0x80000000) == 0)
2247 if (!best || e->function > best->function)
2251 vcpu->regs[VCPU_REGS_RAX] = best->eax;
2252 vcpu->regs[VCPU_REGS_RBX] = best->ebx;
2253 vcpu->regs[VCPU_REGS_RCX] = best->ecx;
2254 vcpu->regs[VCPU_REGS_RDX] = best->edx;
2256 kvm_x86_ops->decache_regs(vcpu);
2257 kvm_x86_ops->skip_emulated_instruction(vcpu);
2259 EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
2262 * Check if userspace requested an interrupt window, and that the
2263 * interrupt window is open.
2265 * No need to exit to userspace if we already have an interrupt queued.
2267 static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu,
2268 struct kvm_run *kvm_run)
2270 return (!vcpu->irq_summary &&
2271 kvm_run->request_interrupt_window &&
2272 vcpu->interrupt_window_open &&
2273 (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF));
2276 static void post_kvm_run_save(struct kvm_vcpu *vcpu,
2277 struct kvm_run *kvm_run)
2279 kvm_run->if_flag = (kvm_x86_ops->get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
2280 kvm_run->cr8 = get_cr8(vcpu);
2281 kvm_run->apic_base = kvm_get_apic_base(vcpu);
2282 if (irqchip_in_kernel(vcpu->kvm))
2283 kvm_run->ready_for_interrupt_injection = 1;
2285 kvm_run->ready_for_interrupt_injection =
2286 (vcpu->interrupt_window_open &&
2287 vcpu->irq_summary == 0);
2290 static int __vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2294 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_SIPI_RECEIVED)) {
2295 pr_debug("vcpu %d received sipi with vector # %x\n",
2296 vcpu->vcpu_id, vcpu->sipi_vector);
2297 kvm_lapic_reset(vcpu);
2298 r = kvm_x86_ops->vcpu_reset(vcpu);
2301 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2305 if (vcpu->guest_debug.enabled)
2306 kvm_x86_ops->guest_debug_pre(vcpu);
2309 r = kvm_mmu_reload(vcpu);
2313 kvm_inject_pending_timer_irqs(vcpu);
2317 kvm_x86_ops->prepare_guest_switch(vcpu);
2318 kvm_load_guest_fpu(vcpu);
2320 local_irq_disable();
2322 if (signal_pending(current)) {
2326 kvm_run->exit_reason = KVM_EXIT_INTR;
2327 ++vcpu->stat.signal_exits;
2331 if (irqchip_in_kernel(vcpu->kvm))
2332 kvm_x86_ops->inject_pending_irq(vcpu);
2333 else if (!vcpu->mmio_read_completed)
2334 kvm_x86_ops->inject_pending_vectors(vcpu, kvm_run);
2336 vcpu->guest_mode = 1;
2340 if (test_and_clear_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
2341 kvm_x86_ops->tlb_flush(vcpu);
2343 kvm_x86_ops->run(vcpu, kvm_run);
2345 vcpu->guest_mode = 0;
2351 * We must have an instruction between local_irq_enable() and
2352 * kvm_guest_exit(), so the timer interrupt isn't delayed by
2353 * the interrupt shadow. The stat.exits increment will do nicely.
2354 * But we need to prevent reordering, hence this barrier():
2363 * Profile KVM exit RIPs:
2365 if (unlikely(prof_on == KVM_PROFILING)) {
2366 kvm_x86_ops->cache_regs(vcpu);
2367 profile_hit(KVM_PROFILING, (void *)vcpu->rip);
2370 r = kvm_x86_ops->handle_exit(kvm_run, vcpu);
2373 if (dm_request_for_irq_injection(vcpu, kvm_run)) {
2375 kvm_run->exit_reason = KVM_EXIT_INTR;
2376 ++vcpu->stat.request_irq_exits;
2379 if (!need_resched())
2389 post_kvm_run_save(vcpu, kvm_run);
2394 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
2401 if (unlikely(vcpu->mp_state == VCPU_MP_STATE_UNINITIALIZED)) {
2402 kvm_vcpu_block(vcpu);
2407 if (vcpu->sigset_active)
2408 sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
2410 /* re-sync apic's tpr */
2411 if (!irqchip_in_kernel(vcpu->kvm))
2412 set_cr8(vcpu, kvm_run->cr8);
2414 if (vcpu->pio.cur_count) {
2415 r = complete_pio(vcpu);
2419 #if CONFIG_HAS_IOMEM
2420 if (vcpu->mmio_needed) {
2421 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
2422 vcpu->mmio_read_completed = 1;
2423 vcpu->mmio_needed = 0;
2424 r = emulate_instruction(vcpu, kvm_run,
2425 vcpu->mmio_fault_cr2, 0, 1);
2426 if (r == EMULATE_DO_MMIO) {
2428 * Read-modify-write. Back to userspace.
2435 if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
2436 kvm_x86_ops->cache_regs(vcpu);
2437 vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
2438 kvm_x86_ops->decache_regs(vcpu);
2441 r = __vcpu_run(vcpu, kvm_run);
2444 if (vcpu->sigset_active)
2445 sigprocmask(SIG_SETMASK, &sigsaved, NULL);
2451 int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2455 kvm_x86_ops->cache_regs(vcpu);
2457 regs->rax = vcpu->regs[VCPU_REGS_RAX];
2458 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
2459 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
2460 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
2461 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
2462 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
2463 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
2464 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
2465 #ifdef CONFIG_X86_64
2466 regs->r8 = vcpu->regs[VCPU_REGS_R8];
2467 regs->r9 = vcpu->regs[VCPU_REGS_R9];
2468 regs->r10 = vcpu->regs[VCPU_REGS_R10];
2469 regs->r11 = vcpu->regs[VCPU_REGS_R11];
2470 regs->r12 = vcpu->regs[VCPU_REGS_R12];
2471 regs->r13 = vcpu->regs[VCPU_REGS_R13];
2472 regs->r14 = vcpu->regs[VCPU_REGS_R14];
2473 regs->r15 = vcpu->regs[VCPU_REGS_R15];
2476 regs->rip = vcpu->rip;
2477 regs->rflags = kvm_x86_ops->get_rflags(vcpu);
2480 * Don't leak debug flags in case they were set for guest debugging
2482 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
2483 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
2490 int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
2494 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
2495 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
2496 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
2497 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
2498 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
2499 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
2500 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
2501 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
2502 #ifdef CONFIG_X86_64
2503 vcpu->regs[VCPU_REGS_R8] = regs->r8;
2504 vcpu->regs[VCPU_REGS_R9] = regs->r9;
2505 vcpu->regs[VCPU_REGS_R10] = regs->r10;
2506 vcpu->regs[VCPU_REGS_R11] = regs->r11;
2507 vcpu->regs[VCPU_REGS_R12] = regs->r12;
2508 vcpu->regs[VCPU_REGS_R13] = regs->r13;
2509 vcpu->regs[VCPU_REGS_R14] = regs->r14;
2510 vcpu->regs[VCPU_REGS_R15] = regs->r15;
2513 vcpu->rip = regs->rip;
2514 kvm_x86_ops->set_rflags(vcpu, regs->rflags);
2516 kvm_x86_ops->decache_regs(vcpu);
2523 static void get_segment(struct kvm_vcpu *vcpu,
2524 struct kvm_segment *var, int seg)
2526 return kvm_x86_ops->get_segment(vcpu, var, seg);
2529 void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
2531 struct kvm_segment cs;
2533 get_segment(vcpu, &cs, VCPU_SREG_CS);
2537 EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
2539 int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
2540 struct kvm_sregs *sregs)
2542 struct descriptor_table dt;
2547 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2548 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2549 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2550 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2551 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2552 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2554 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2555 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2557 kvm_x86_ops->get_idt(vcpu, &dt);
2558 sregs->idt.limit = dt.limit;
2559 sregs->idt.base = dt.base;
2560 kvm_x86_ops->get_gdt(vcpu, &dt);
2561 sregs->gdt.limit = dt.limit;
2562 sregs->gdt.base = dt.base;
2564 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2565 sregs->cr0 = vcpu->cr0;
2566 sregs->cr2 = vcpu->cr2;
2567 sregs->cr3 = vcpu->cr3;
2568 sregs->cr4 = vcpu->cr4;
2569 sregs->cr8 = get_cr8(vcpu);
2570 sregs->efer = vcpu->shadow_efer;
2571 sregs->apic_base = kvm_get_apic_base(vcpu);
2573 if (irqchip_in_kernel(vcpu->kvm)) {
2574 memset(sregs->interrupt_bitmap, 0,
2575 sizeof sregs->interrupt_bitmap);
2576 pending_vec = kvm_x86_ops->get_irq(vcpu);
2577 if (pending_vec >= 0)
2578 set_bit(pending_vec,
2579 (unsigned long *)sregs->interrupt_bitmap);
2581 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
2582 sizeof sregs->interrupt_bitmap);
2589 static void set_segment(struct kvm_vcpu *vcpu,
2590 struct kvm_segment *var, int seg)
2592 return kvm_x86_ops->set_segment(vcpu, var, seg);
2595 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
2596 struct kvm_sregs *sregs)
2598 int mmu_reset_needed = 0;
2599 int i, pending_vec, max_bits;
2600 struct descriptor_table dt;
2604 dt.limit = sregs->idt.limit;
2605 dt.base = sregs->idt.base;
2606 kvm_x86_ops->set_idt(vcpu, &dt);
2607 dt.limit = sregs->gdt.limit;
2608 dt.base = sregs->gdt.base;
2609 kvm_x86_ops->set_gdt(vcpu, &dt);
2611 vcpu->cr2 = sregs->cr2;
2612 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
2613 vcpu->cr3 = sregs->cr3;
2615 set_cr8(vcpu, sregs->cr8);
2617 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2618 #ifdef CONFIG_X86_64
2619 kvm_x86_ops->set_efer(vcpu, sregs->efer);
2621 kvm_set_apic_base(vcpu, sregs->apic_base);
2623 kvm_x86_ops->decache_cr4_guest_bits(vcpu);
2625 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2626 vcpu->cr0 = sregs->cr0;
2627 kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
2629 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
2630 kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
2631 if (!is_long_mode(vcpu) && is_pae(vcpu))
2632 load_pdptrs(vcpu, vcpu->cr3);
2634 if (mmu_reset_needed)
2635 kvm_mmu_reset_context(vcpu);
2637 if (!irqchip_in_kernel(vcpu->kvm)) {
2638 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
2639 sizeof vcpu->irq_pending);
2640 vcpu->irq_summary = 0;
2641 for (i = 0; i < ARRAY_SIZE(vcpu->irq_pending); ++i)
2642 if (vcpu->irq_pending[i])
2643 __set_bit(i, &vcpu->irq_summary);
2645 max_bits = (sizeof sregs->interrupt_bitmap) << 3;
2646 pending_vec = find_first_bit(
2647 (const unsigned long *)sregs->interrupt_bitmap,
2649 /* Only pending external irq is handled here */
2650 if (pending_vec < max_bits) {
2651 kvm_x86_ops->set_irq(vcpu, pending_vec);
2652 pr_debug("Set back pending irq %d\n",
2657 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
2658 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
2659 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
2660 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
2661 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
2662 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
2664 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
2665 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
2672 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
2673 struct kvm_debug_guest *dbg)
2679 r = kvm_x86_ops->set_guest_debug(vcpu, dbg);
2687 * fxsave fpu state. Taken from x86_64/processor.h. To be killed when
2688 * we have asm/x86/processor.h
2699 u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
2700 #ifdef CONFIG_X86_64
2701 u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
2703 u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
2708 * Translate a guest virtual address to a guest physical address.
2710 int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
2711 struct kvm_translation *tr)
2713 unsigned long vaddr = tr->linear_address;
2717 mutex_lock(&vcpu->kvm->lock);
2718 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
2719 tr->physical_address = gpa;
2720 tr->valid = gpa != UNMAPPED_GVA;
2723 mutex_unlock(&vcpu->kvm->lock);
2729 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2731 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2735 memcpy(fpu->fpr, fxsave->st_space, 128);
2736 fpu->fcw = fxsave->cwd;
2737 fpu->fsw = fxsave->swd;
2738 fpu->ftwx = fxsave->twd;
2739 fpu->last_opcode = fxsave->fop;
2740 fpu->last_ip = fxsave->rip;
2741 fpu->last_dp = fxsave->rdp;
2742 memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
2749 int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
2751 struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
2755 memcpy(fxsave->st_space, fpu->fpr, 128);
2756 fxsave->cwd = fpu->fcw;
2757 fxsave->swd = fpu->fsw;
2758 fxsave->twd = fpu->ftwx;
2759 fxsave->fop = fpu->last_opcode;
2760 fxsave->rip = fpu->last_ip;
2761 fxsave->rdp = fpu->last_dp;
2762 memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
2769 void fx_init(struct kvm_vcpu *vcpu)
2771 unsigned after_mxcsr_mask;
2773 /* Initialize guest FPU by resetting ours and saving into guest's */
2775 fx_save(&vcpu->host_fx_image);
2777 fx_save(&vcpu->guest_fx_image);
2778 fx_restore(&vcpu->host_fx_image);
2781 vcpu->cr0 |= X86_CR0_ET;
2782 after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
2783 vcpu->guest_fx_image.mxcsr = 0x1f80;
2784 memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
2785 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
2787 EXPORT_SYMBOL_GPL(fx_init);
2789 void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
2791 if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
2794 vcpu->guest_fpu_loaded = 1;
2795 fx_save(&vcpu->host_fx_image);
2796 fx_restore(&vcpu->guest_fx_image);
2798 EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
2800 void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
2802 if (!vcpu->guest_fpu_loaded)
2805 vcpu->guest_fpu_loaded = 0;
2806 fx_save(&vcpu->guest_fx_image);
2807 fx_restore(&vcpu->host_fx_image);
2808 ++vcpu->stat.fpu_reload;
2810 EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
2812 void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
2814 kvm_x86_ops->vcpu_free(vcpu);
2817 struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
2820 return kvm_x86_ops->vcpu_create(kvm, id);
2823 int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
2827 /* We do fxsave: this must be aligned. */
2828 BUG_ON((unsigned long)&vcpu->host_fx_image & 0xF);
2831 r = kvm_arch_vcpu_reset(vcpu);
2833 r = kvm_mmu_setup(vcpu);
2840 kvm_x86_ops->vcpu_free(vcpu);
2844 void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
2847 kvm_mmu_unload(vcpu);
2850 kvm_x86_ops->vcpu_free(vcpu);
2853 int kvm_arch_vcpu_reset(struct kvm_vcpu *vcpu)
2855 return kvm_x86_ops->vcpu_reset(vcpu);
2858 void kvm_arch_hardware_enable(void *garbage)
2860 kvm_x86_ops->hardware_enable(garbage);
2863 void kvm_arch_hardware_disable(void *garbage)
2865 kvm_x86_ops->hardware_disable(garbage);
2868 int kvm_arch_hardware_setup(void)
2870 return kvm_x86_ops->hardware_setup();
2873 void kvm_arch_hardware_unsetup(void)
2875 kvm_x86_ops->hardware_unsetup();
2878 void kvm_arch_check_processor_compat(void *rtn)
2880 kvm_x86_ops->check_processor_compatibility(rtn);
2883 int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
2889 BUG_ON(vcpu->kvm == NULL);
2892 vcpu->mmu.root_hpa = INVALID_PAGE;
2893 if (!irqchip_in_kernel(kvm) || vcpu->vcpu_id == 0)
2894 vcpu->mp_state = VCPU_MP_STATE_RUNNABLE;
2896 vcpu->mp_state = VCPU_MP_STATE_UNINITIALIZED;
2898 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2903 vcpu->pio_data = page_address(page);
2905 r = kvm_mmu_create(vcpu);
2907 goto fail_free_pio_data;
2909 if (irqchip_in_kernel(kvm)) {
2910 r = kvm_create_lapic(vcpu);
2912 goto fail_mmu_destroy;
2918 kvm_mmu_destroy(vcpu);
2920 free_page((unsigned long)vcpu->pio_data);
2925 void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
2927 kvm_free_lapic(vcpu);
2928 kvm_mmu_destroy(vcpu);
2929 free_page((unsigned long)vcpu->pio_data);
2932 struct kvm *kvm_arch_create_vm(void)
2934 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
2937 return ERR_PTR(-ENOMEM);
2939 INIT_LIST_HEAD(&kvm->active_mmu_pages);
2944 static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
2947 kvm_mmu_unload(vcpu);
2951 static void kvm_free_vcpus(struct kvm *kvm)
2956 * Unpin any mmu pages first.
2958 for (i = 0; i < KVM_MAX_VCPUS; ++i)
2960 kvm_unload_vcpu_mmu(kvm->vcpus[i]);
2961 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2962 if (kvm->vcpus[i]) {
2963 kvm_arch_vcpu_free(kvm->vcpus[i]);
2964 kvm->vcpus[i] = NULL;
2970 void kvm_arch_destroy_vm(struct kvm *kvm)
2973 kfree(kvm->vioapic);
2974 kvm_free_vcpus(kvm);
2975 kvm_free_physmem(kvm);
2979 int kvm_arch_set_memory_region(struct kvm *kvm,
2980 struct kvm_userspace_memory_region *mem,
2981 struct kvm_memory_slot old,
2984 int npages = mem->memory_size >> PAGE_SHIFT;
2985 struct kvm_memory_slot *memslot = &kvm->memslots[mem->slot];
2987 /*To keep backward compatibility with older userspace,
2988 *x86 needs to hanlde !user_alloc case.
2991 if (npages && !old.rmap) {
2992 down_write(¤t->mm->mmap_sem);
2993 memslot->userspace_addr = do_mmap(NULL, 0,
2995 PROT_READ | PROT_WRITE,
2996 MAP_SHARED | MAP_ANONYMOUS,
2998 up_write(¤t->mm->mmap_sem);
3000 if (IS_ERR((void *)memslot->userspace_addr))
3001 return PTR_ERR((void *)memslot->userspace_addr);
3003 if (!old.user_alloc && old.rmap) {
3006 down_write(¤t->mm->mmap_sem);
3007 ret = do_munmap(current->mm, old.userspace_addr,
3008 old.npages * PAGE_SIZE);
3009 up_write(¤t->mm->mmap_sem);
3012 "kvm_vm_ioctl_set_memory_region: "
3013 "failed to munmap memory\n");
3018 if (!kvm->n_requested_mmu_pages) {
3019 unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
3020 kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
3023 kvm_mmu_slot_remove_write_access(kvm, mem->slot);
3024 kvm_flush_remote_tlbs(kvm);