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 "segment_descriptor.h"
22 #include <linux/kvm.h>
24 #include <linux/vmalloc.h>
25 #include <linux/module.h>
27 #include <asm/uaccess.h>
29 #define MAX_IO_MSRS 256
30 #define CR0_RESERVED_BITS \
31 (~(unsigned long)(X86_CR0_PE | X86_CR0_MP | X86_CR0_EM | X86_CR0_TS \
32 | X86_CR0_ET | X86_CR0_NE | X86_CR0_WP | X86_CR0_AM \
33 | X86_CR0_NW | X86_CR0_CD | X86_CR0_PG))
34 #define CR4_RESERVED_BITS \
35 (~(unsigned long)(X86_CR4_VME | X86_CR4_PVI | X86_CR4_TSD | X86_CR4_DE\
36 | X86_CR4_PSE | X86_CR4_PAE | X86_CR4_MCE \
37 | X86_CR4_PGE | X86_CR4_PCE | X86_CR4_OSFXSR \
38 | X86_CR4_OSXMMEXCPT | X86_CR4_VMXE))
40 #define CR8_RESERVED_BITS (~(unsigned long)X86_CR8_TPR)
41 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
43 unsigned long segment_base(u16 selector)
45 struct descriptor_table gdt;
46 struct segment_descriptor *d;
47 unsigned long table_base;
53 asm("sgdt %0" : "=m"(gdt));
54 table_base = gdt.base;
56 if (selector & 4) { /* from ldt */
59 asm("sldt %0" : "=g"(ldt_selector));
60 table_base = segment_base(ldt_selector);
62 d = (struct segment_descriptor *)(table_base + (selector & ~7));
63 v = d->base_low | ((unsigned long)d->base_mid << 16) |
64 ((unsigned long)d->base_high << 24);
66 if (d->system == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
67 v |= ((unsigned long) \
68 ((struct segment_descriptor_64 *)d)->base_higher) << 32;
72 EXPORT_SYMBOL_GPL(segment_base);
74 u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
76 if (irqchip_in_kernel(vcpu->kvm))
77 return vcpu->apic_base;
79 return vcpu->apic_base;
81 EXPORT_SYMBOL_GPL(kvm_get_apic_base);
83 void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
85 /* TODO: reserve bits check */
86 if (irqchip_in_kernel(vcpu->kvm))
87 kvm_lapic_set_base(vcpu, data);
89 vcpu->apic_base = data;
91 EXPORT_SYMBOL_GPL(kvm_set_apic_base);
93 static void inject_gp(struct kvm_vcpu *vcpu)
95 kvm_x86_ops->inject_gp(vcpu, 0);
99 * Load the pae pdptrs. Return true is they are all valid.
101 int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
103 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
104 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
107 u64 pdpte[ARRAY_SIZE(vcpu->pdptrs)];
109 mutex_lock(&vcpu->kvm->lock);
110 ret = kvm_read_guest_page(vcpu->kvm, pdpt_gfn, pdpte,
111 offset * sizeof(u64), sizeof(pdpte));
116 for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
117 if ((pdpte[i] & 1) && (pdpte[i] & 0xfffffff0000001e6ull)) {
124 memcpy(vcpu->pdptrs, pdpte, sizeof(vcpu->pdptrs));
126 mutex_unlock(&vcpu->kvm->lock);
131 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
133 if (cr0 & CR0_RESERVED_BITS) {
134 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
140 if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD)) {
141 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
146 if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE)) {
147 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
148 "and a clear PE flag\n");
153 if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
155 if ((vcpu->shadow_efer & EFER_LME)) {
159 printk(KERN_DEBUG "set_cr0: #GP, start paging "
160 "in long mode while PAE is disabled\n");
164 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
166 printk(KERN_DEBUG "set_cr0: #GP, start paging "
167 "in long mode while CS.L == 1\n");
174 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
175 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
183 kvm_x86_ops->set_cr0(vcpu, cr0);
186 mutex_lock(&vcpu->kvm->lock);
187 kvm_mmu_reset_context(vcpu);
188 mutex_unlock(&vcpu->kvm->lock);
191 EXPORT_SYMBOL_GPL(set_cr0);
193 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
195 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
197 EXPORT_SYMBOL_GPL(lmsw);
199 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
201 if (cr4 & CR4_RESERVED_BITS) {
202 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
207 if (is_long_mode(vcpu)) {
208 if (!(cr4 & X86_CR4_PAE)) {
209 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
214 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & X86_CR4_PAE)
215 && !load_pdptrs(vcpu, vcpu->cr3)) {
216 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
221 if (cr4 & X86_CR4_VMXE) {
222 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
226 kvm_x86_ops->set_cr4(vcpu, cr4);
228 mutex_lock(&vcpu->kvm->lock);
229 kvm_mmu_reset_context(vcpu);
230 mutex_unlock(&vcpu->kvm->lock);
232 EXPORT_SYMBOL_GPL(set_cr4);
234 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
236 if (is_long_mode(vcpu)) {
237 if (cr3 & CR3_L_MODE_RESERVED_BITS) {
238 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
244 if (cr3 & CR3_PAE_RESERVED_BITS) {
246 "set_cr3: #GP, reserved bits\n");
250 if (is_paging(vcpu) && !load_pdptrs(vcpu, cr3)) {
251 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
258 * We don't check reserved bits in nonpae mode, because
259 * this isn't enforced, and VMware depends on this.
263 mutex_lock(&vcpu->kvm->lock);
265 * Does the new cr3 value map to physical memory? (Note, we
266 * catch an invalid cr3 even in real-mode, because it would
267 * cause trouble later on when we turn on paging anyway.)
269 * A real CPU would silently accept an invalid cr3 and would
270 * attempt to use it - with largely undefined (and often hard
271 * to debug) behavior on the guest side.
273 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
277 vcpu->mmu.new_cr3(vcpu);
279 mutex_unlock(&vcpu->kvm->lock);
281 EXPORT_SYMBOL_GPL(set_cr3);
283 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
285 if (cr8 & CR8_RESERVED_BITS) {
286 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
290 if (irqchip_in_kernel(vcpu->kvm))
291 kvm_lapic_set_tpr(vcpu, cr8);
295 EXPORT_SYMBOL_GPL(set_cr8);
297 unsigned long get_cr8(struct kvm_vcpu *vcpu)
299 if (irqchip_in_kernel(vcpu->kvm))
300 return kvm_lapic_get_cr8(vcpu);
304 EXPORT_SYMBOL_GPL(get_cr8);
307 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
308 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
310 * This list is modified at module load time to reflect the
311 * capabilities of the host cpu.
313 static u32 msrs_to_save[] = {
314 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
317 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
319 MSR_IA32_TIME_STAMP_COUNTER,
322 static unsigned num_msrs_to_save;
324 static u32 emulated_msrs[] = {
325 MSR_IA32_MISC_ENABLE,
330 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
332 if (efer & EFER_RESERVED_BITS) {
333 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
340 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
341 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
346 kvm_x86_ops->set_efer(vcpu, efer);
349 efer |= vcpu->shadow_efer & EFER_LMA;
351 vcpu->shadow_efer = efer;
357 * Writes msr value into into the appropriate "register".
358 * Returns 0 on success, non-0 otherwise.
359 * Assumes vcpu_load() was already called.
361 int kvm_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
363 return kvm_x86_ops->set_msr(vcpu, msr_index, data);
367 * Adapt set_msr() to msr_io()'s calling convention
369 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
371 return kvm_set_msr(vcpu, index, *data);
375 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
380 set_efer(vcpu, data);
383 case MSR_IA32_MC0_STATUS:
384 pr_unimpl(vcpu, "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
387 case MSR_IA32_MCG_STATUS:
388 pr_unimpl(vcpu, "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
391 case MSR_IA32_UCODE_REV:
392 case MSR_IA32_UCODE_WRITE:
393 case 0x200 ... 0x2ff: /* MTRRs */
395 case MSR_IA32_APICBASE:
396 kvm_set_apic_base(vcpu, data);
398 case MSR_IA32_MISC_ENABLE:
399 vcpu->ia32_misc_enable_msr = data;
402 pr_unimpl(vcpu, "unhandled wrmsr: 0x%x\n", msr);
407 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
411 * Reads an msr value (of 'msr_index') into 'pdata'.
412 * Returns 0 on success, non-0 otherwise.
413 * Assumes vcpu_load() was already called.
415 int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
417 return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
420 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
425 case 0xc0010010: /* SYSCFG */
426 case 0xc0010015: /* HWCR */
427 case MSR_IA32_PLATFORM_ID:
428 case MSR_IA32_P5_MC_ADDR:
429 case MSR_IA32_P5_MC_TYPE:
430 case MSR_IA32_MC0_CTL:
431 case MSR_IA32_MCG_STATUS:
432 case MSR_IA32_MCG_CAP:
433 case MSR_IA32_MC0_MISC:
434 case MSR_IA32_MC0_MISC+4:
435 case MSR_IA32_MC0_MISC+8:
436 case MSR_IA32_MC0_MISC+12:
437 case MSR_IA32_MC0_MISC+16:
438 case MSR_IA32_UCODE_REV:
439 case MSR_IA32_PERF_STATUS:
440 case MSR_IA32_EBL_CR_POWERON:
443 case 0x200 ... 0x2ff:
446 case 0xcd: /* fsb frequency */
449 case MSR_IA32_APICBASE:
450 data = kvm_get_apic_base(vcpu);
452 case MSR_IA32_MISC_ENABLE:
453 data = vcpu->ia32_misc_enable_msr;
457 data = vcpu->shadow_efer;
461 pr_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
467 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
470 * Read or write a bunch of msrs. All parameters are kernel addresses.
472 * @return number of msrs set successfully.
474 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
475 struct kvm_msr_entry *entries,
476 int (*do_msr)(struct kvm_vcpu *vcpu,
477 unsigned index, u64 *data))
483 for (i = 0; i < msrs->nmsrs; ++i)
484 if (do_msr(vcpu, entries[i].index, &entries[i].data))
493 * Read or write a bunch of msrs. Parameters are user addresses.
495 * @return number of msrs set successfully.
497 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
498 int (*do_msr)(struct kvm_vcpu *vcpu,
499 unsigned index, u64 *data),
502 struct kvm_msrs msrs;
503 struct kvm_msr_entry *entries;
508 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
512 if (msrs.nmsrs >= MAX_IO_MSRS)
516 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
517 entries = vmalloc(size);
522 if (copy_from_user(entries, user_msrs->entries, size))
525 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
530 if (writeback && copy_to_user(user_msrs->entries, entries, size))
541 long kvm_arch_dev_ioctl(struct file *filp,
542 unsigned int ioctl, unsigned long arg)
544 void __user *argp = (void __user *)arg;
548 case KVM_GET_MSR_INDEX_LIST: {
549 struct kvm_msr_list __user *user_msr_list = argp;
550 struct kvm_msr_list msr_list;
554 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
557 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
558 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
561 if (n < num_msrs_to_save)
564 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
565 num_msrs_to_save * sizeof(u32)))
567 if (copy_to_user(user_msr_list->indices
568 + num_msrs_to_save * sizeof(u32),
570 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
582 void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
584 kvm_x86_ops->vcpu_load(vcpu, cpu);
587 void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
589 kvm_x86_ops->vcpu_put(vcpu);
592 static void cpuid_fix_nx_cap(struct kvm_vcpu *vcpu)
596 struct kvm_cpuid_entry *e, *entry;
598 rdmsrl(MSR_EFER, efer);
600 for (i = 0; i < vcpu->cpuid_nent; ++i) {
601 e = &vcpu->cpuid_entries[i];
602 if (e->function == 0x80000001) {
607 if (entry && (entry->edx & (1 << 20)) && !(efer & EFER_NX)) {
608 entry->edx &= ~(1 << 20);
609 printk(KERN_INFO "kvm: guest NX capability removed\n");
613 static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
614 struct kvm_cpuid *cpuid,
615 struct kvm_cpuid_entry __user *entries)
620 if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
623 if (copy_from_user(&vcpu->cpuid_entries, entries,
624 cpuid->nent * sizeof(struct kvm_cpuid_entry)))
626 vcpu->cpuid_nent = cpuid->nent;
627 cpuid_fix_nx_cap(vcpu);
634 static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
635 struct kvm_lapic_state *s)
638 memcpy(s->regs, vcpu->apic->regs, sizeof *s);
644 static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
645 struct kvm_lapic_state *s)
648 memcpy(vcpu->apic->regs, s->regs, sizeof *s);
649 kvm_apic_post_state_restore(vcpu);
655 long kvm_arch_vcpu_ioctl(struct file *filp,
656 unsigned int ioctl, unsigned long arg)
658 struct kvm_vcpu *vcpu = filp->private_data;
659 void __user *argp = (void __user *)arg;
663 case KVM_GET_LAPIC: {
664 struct kvm_lapic_state lapic;
666 memset(&lapic, 0, sizeof lapic);
667 r = kvm_vcpu_ioctl_get_lapic(vcpu, &lapic);
671 if (copy_to_user(argp, &lapic, sizeof lapic))
676 case KVM_SET_LAPIC: {
677 struct kvm_lapic_state lapic;
680 if (copy_from_user(&lapic, argp, sizeof lapic))
682 r = kvm_vcpu_ioctl_set_lapic(vcpu, &lapic);;
688 case KVM_SET_CPUID: {
689 struct kvm_cpuid __user *cpuid_arg = argp;
690 struct kvm_cpuid cpuid;
693 if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
695 r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
701 r = msr_io(vcpu, argp, kvm_get_msr, 1);
704 r = msr_io(vcpu, argp, do_set_msr, 0);
713 static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
717 if (addr > (unsigned int)(-3 * PAGE_SIZE))
719 ret = kvm_x86_ops->set_tss_addr(kvm, addr);
723 static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
724 u32 kvm_nr_mmu_pages)
726 if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
729 mutex_lock(&kvm->lock);
731 kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
732 kvm->n_requested_mmu_pages = kvm_nr_mmu_pages;
734 mutex_unlock(&kvm->lock);
738 static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
740 return kvm->n_alloc_mmu_pages;
744 * Set a new alias region. Aliases map a portion of physical memory into
745 * another portion. This is useful for memory windows, for example the PC
748 static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
749 struct kvm_memory_alias *alias)
752 struct kvm_mem_alias *p;
755 /* General sanity checks */
756 if (alias->memory_size & (PAGE_SIZE - 1))
758 if (alias->guest_phys_addr & (PAGE_SIZE - 1))
760 if (alias->slot >= KVM_ALIAS_SLOTS)
762 if (alias->guest_phys_addr + alias->memory_size
763 < alias->guest_phys_addr)
765 if (alias->target_phys_addr + alias->memory_size
766 < alias->target_phys_addr)
769 mutex_lock(&kvm->lock);
771 p = &kvm->aliases[alias->slot];
772 p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
773 p->npages = alias->memory_size >> PAGE_SHIFT;
774 p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
776 for (n = KVM_ALIAS_SLOTS; n > 0; --n)
777 if (kvm->aliases[n - 1].npages)
781 kvm_mmu_zap_all(kvm);
783 mutex_unlock(&kvm->lock);
791 static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
796 switch (chip->chip_id) {
797 case KVM_IRQCHIP_PIC_MASTER:
798 memcpy(&chip->chip.pic,
799 &pic_irqchip(kvm)->pics[0],
800 sizeof(struct kvm_pic_state));
802 case KVM_IRQCHIP_PIC_SLAVE:
803 memcpy(&chip->chip.pic,
804 &pic_irqchip(kvm)->pics[1],
805 sizeof(struct kvm_pic_state));
807 case KVM_IRQCHIP_IOAPIC:
808 memcpy(&chip->chip.ioapic,
810 sizeof(struct kvm_ioapic_state));
819 static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
824 switch (chip->chip_id) {
825 case KVM_IRQCHIP_PIC_MASTER:
826 memcpy(&pic_irqchip(kvm)->pics[0],
828 sizeof(struct kvm_pic_state));
830 case KVM_IRQCHIP_PIC_SLAVE:
831 memcpy(&pic_irqchip(kvm)->pics[1],
833 sizeof(struct kvm_pic_state));
835 case KVM_IRQCHIP_IOAPIC:
836 memcpy(ioapic_irqchip(kvm),
838 sizeof(struct kvm_ioapic_state));
844 kvm_pic_update_irq(pic_irqchip(kvm));
848 long kvm_arch_vm_ioctl(struct file *filp,
849 unsigned int ioctl, unsigned long arg)
851 struct kvm *kvm = filp->private_data;
852 void __user *argp = (void __user *)arg;
856 case KVM_SET_TSS_ADDR:
857 r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
861 case KVM_SET_MEMORY_REGION: {
862 struct kvm_memory_region kvm_mem;
863 struct kvm_userspace_memory_region kvm_userspace_mem;
866 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
868 kvm_userspace_mem.slot = kvm_mem.slot;
869 kvm_userspace_mem.flags = kvm_mem.flags;
870 kvm_userspace_mem.guest_phys_addr = kvm_mem.guest_phys_addr;
871 kvm_userspace_mem.memory_size = kvm_mem.memory_size;
872 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 0);
877 case KVM_SET_NR_MMU_PAGES:
878 r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
882 case KVM_GET_NR_MMU_PAGES:
883 r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
885 case KVM_SET_MEMORY_ALIAS: {
886 struct kvm_memory_alias alias;
889 if (copy_from_user(&alias, argp, sizeof alias))
891 r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
896 case KVM_CREATE_IRQCHIP:
898 kvm->vpic = kvm_create_pic(kvm);
900 r = kvm_ioapic_init(kvm);
910 struct kvm_irq_level irq_event;
913 if (copy_from_user(&irq_event, argp, sizeof irq_event))
915 if (irqchip_in_kernel(kvm)) {
916 mutex_lock(&kvm->lock);
917 if (irq_event.irq < 16)
918 kvm_pic_set_irq(pic_irqchip(kvm),
921 kvm_ioapic_set_irq(kvm->vioapic,
924 mutex_unlock(&kvm->lock);
929 case KVM_GET_IRQCHIP: {
930 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
931 struct kvm_irqchip chip;
934 if (copy_from_user(&chip, argp, sizeof chip))
937 if (!irqchip_in_kernel(kvm))
939 r = kvm_vm_ioctl_get_irqchip(kvm, &chip);
943 if (copy_to_user(argp, &chip, sizeof chip))
948 case KVM_SET_IRQCHIP: {
949 /* 0: PIC master, 1: PIC slave, 2: IOAPIC */
950 struct kvm_irqchip chip;
953 if (copy_from_user(&chip, argp, sizeof chip))
956 if (!irqchip_in_kernel(kvm))
958 r = kvm_vm_ioctl_set_irqchip(kvm, &chip);
971 static __init void kvm_init_msr_list(void)
976 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
977 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
980 msrs_to_save[j] = msrs_to_save[i];
983 num_msrs_to_save = j;
987 * Only apic need an MMIO device hook, so shortcut now..
989 static struct kvm_io_device *vcpu_find_pervcpu_dev(struct kvm_vcpu *vcpu,
992 struct kvm_io_device *dev;
995 dev = &vcpu->apic->dev;
996 if (dev->in_range(dev, addr))
1003 static struct kvm_io_device *vcpu_find_mmio_dev(struct kvm_vcpu *vcpu,
1006 struct kvm_io_device *dev;
1008 dev = vcpu_find_pervcpu_dev(vcpu, addr);
1010 dev = kvm_io_bus_find_dev(&vcpu->kvm->mmio_bus, addr);
1014 int emulator_read_std(unsigned long addr,
1017 struct kvm_vcpu *vcpu)
1022 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1023 unsigned offset = addr & (PAGE_SIZE-1);
1024 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
1027 if (gpa == UNMAPPED_GVA)
1028 return X86EMUL_PROPAGATE_FAULT;
1029 ret = kvm_read_guest(vcpu->kvm, gpa, data, tocopy);
1031 return X86EMUL_UNHANDLEABLE;
1038 return X86EMUL_CONTINUE;
1040 EXPORT_SYMBOL_GPL(emulator_read_std);
1042 static int emulator_write_std(unsigned long addr,
1045 struct kvm_vcpu *vcpu)
1047 pr_unimpl(vcpu, "emulator_write_std: addr %lx n %d\n", addr, bytes);
1048 return X86EMUL_UNHANDLEABLE;
1051 static int emulator_read_emulated(unsigned long addr,
1054 struct kvm_vcpu *vcpu)
1056 struct kvm_io_device *mmio_dev;
1059 if (vcpu->mmio_read_completed) {
1060 memcpy(val, vcpu->mmio_data, bytes);
1061 vcpu->mmio_read_completed = 0;
1062 return X86EMUL_CONTINUE;
1065 gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1067 /* For APIC access vmexit */
1068 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1071 if (emulator_read_std(addr, val, bytes, vcpu)
1072 == X86EMUL_CONTINUE)
1073 return X86EMUL_CONTINUE;
1074 if (gpa == UNMAPPED_GVA)
1075 return X86EMUL_PROPAGATE_FAULT;
1079 * Is this MMIO handled locally?
1081 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1083 kvm_iodevice_read(mmio_dev, gpa, bytes, val);
1084 return X86EMUL_CONTINUE;
1087 vcpu->mmio_needed = 1;
1088 vcpu->mmio_phys_addr = gpa;
1089 vcpu->mmio_size = bytes;
1090 vcpu->mmio_is_write = 0;
1092 return X86EMUL_UNHANDLEABLE;
1095 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
1096 const void *val, int bytes)
1100 ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
1103 kvm_mmu_pte_write(vcpu, gpa, val, bytes);
1107 static int emulator_write_emulated_onepage(unsigned long addr,
1110 struct kvm_vcpu *vcpu)
1112 struct kvm_io_device *mmio_dev;
1113 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
1115 if (gpa == UNMAPPED_GVA) {
1116 kvm_x86_ops->inject_page_fault(vcpu, addr, 2);
1117 return X86EMUL_PROPAGATE_FAULT;
1120 /* For APIC access vmexit */
1121 if ((gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
1124 if (emulator_write_phys(vcpu, gpa, val, bytes))
1125 return X86EMUL_CONTINUE;
1129 * Is this MMIO handled locally?
1131 mmio_dev = vcpu_find_mmio_dev(vcpu, gpa);
1133 kvm_iodevice_write(mmio_dev, gpa, bytes, val);
1134 return X86EMUL_CONTINUE;
1137 vcpu->mmio_needed = 1;
1138 vcpu->mmio_phys_addr = gpa;
1139 vcpu->mmio_size = bytes;
1140 vcpu->mmio_is_write = 1;
1141 memcpy(vcpu->mmio_data, val, bytes);
1143 return X86EMUL_CONTINUE;
1146 int emulator_write_emulated(unsigned long addr,
1149 struct kvm_vcpu *vcpu)
1151 /* Crossing a page boundary? */
1152 if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
1155 now = -addr & ~PAGE_MASK;
1156 rc = emulator_write_emulated_onepage(addr, val, now, vcpu);
1157 if (rc != X86EMUL_CONTINUE)
1163 return emulator_write_emulated_onepage(addr, val, bytes, vcpu);
1165 EXPORT_SYMBOL_GPL(emulator_write_emulated);
1167 static int emulator_cmpxchg_emulated(unsigned long addr,
1171 struct kvm_vcpu *vcpu)
1173 static int reported;
1177 printk(KERN_WARNING "kvm: emulating exchange as write\n");
1179 return emulator_write_emulated(addr, new, bytes, vcpu);
1182 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1184 return kvm_x86_ops->get_segment_base(vcpu, seg);
1187 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1189 return X86EMUL_CONTINUE;
1192 int emulate_clts(struct kvm_vcpu *vcpu)
1194 kvm_x86_ops->set_cr0(vcpu, vcpu->cr0 & ~X86_CR0_TS);
1195 return X86EMUL_CONTINUE;
1198 int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
1200 struct kvm_vcpu *vcpu = ctxt->vcpu;
1204 *dest = kvm_x86_ops->get_dr(vcpu, dr);
1205 return X86EMUL_CONTINUE;
1207 pr_unimpl(vcpu, "%s: unexpected dr %u\n", __FUNCTION__, dr);
1208 return X86EMUL_UNHANDLEABLE;
1212 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1214 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1217 kvm_x86_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1219 /* FIXME: better handling */
1220 return X86EMUL_UNHANDLEABLE;
1222 return X86EMUL_CONTINUE;
1225 void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context)
1227 static int reported;
1229 unsigned long rip = vcpu->rip;
1230 unsigned long rip_linear;
1232 rip_linear = rip + get_segment_base(vcpu, VCPU_SREG_CS);
1237 emulator_read_std(rip_linear, (void *)opcodes, 4, vcpu);
1239 printk(KERN_ERR "emulation failed (%s) rip %lx %02x %02x %02x %02x\n",
1240 context, rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1243 EXPORT_SYMBOL_GPL(kvm_report_emulation_failure);
1245 struct x86_emulate_ops emulate_ops = {
1246 .read_std = emulator_read_std,
1247 .write_std = emulator_write_std,
1248 .read_emulated = emulator_read_emulated,
1249 .write_emulated = emulator_write_emulated,
1250 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1253 int emulate_instruction(struct kvm_vcpu *vcpu,
1254 struct kvm_run *run,
1261 vcpu->mmio_fault_cr2 = cr2;
1262 kvm_x86_ops->cache_regs(vcpu);
1264 vcpu->mmio_is_write = 0;
1265 vcpu->pio.string = 0;
1269 kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1271 vcpu->emulate_ctxt.vcpu = vcpu;
1272 vcpu->emulate_ctxt.eflags = kvm_x86_ops->get_rflags(vcpu);
1273 vcpu->emulate_ctxt.cr2 = cr2;
1274 vcpu->emulate_ctxt.mode =
1275 (vcpu->emulate_ctxt.eflags & X86_EFLAGS_VM)
1276 ? X86EMUL_MODE_REAL : cs_l
1277 ? X86EMUL_MODE_PROT64 : cs_db
1278 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1280 if (vcpu->emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1281 vcpu->emulate_ctxt.cs_base = 0;
1282 vcpu->emulate_ctxt.ds_base = 0;
1283 vcpu->emulate_ctxt.es_base = 0;
1284 vcpu->emulate_ctxt.ss_base = 0;
1286 vcpu->emulate_ctxt.cs_base =
1287 get_segment_base(vcpu, VCPU_SREG_CS);
1288 vcpu->emulate_ctxt.ds_base =
1289 get_segment_base(vcpu, VCPU_SREG_DS);
1290 vcpu->emulate_ctxt.es_base =
1291 get_segment_base(vcpu, VCPU_SREG_ES);
1292 vcpu->emulate_ctxt.ss_base =
1293 get_segment_base(vcpu, VCPU_SREG_SS);
1296 vcpu->emulate_ctxt.gs_base =
1297 get_segment_base(vcpu, VCPU_SREG_GS);
1298 vcpu->emulate_ctxt.fs_base =
1299 get_segment_base(vcpu, VCPU_SREG_FS);
1301 r = x86_decode_insn(&vcpu->emulate_ctxt, &emulate_ops);
1303 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1304 return EMULATE_DONE;
1305 return EMULATE_FAIL;
1309 r = x86_emulate_insn(&vcpu->emulate_ctxt, &emulate_ops);
1311 if (vcpu->pio.string)
1312 return EMULATE_DO_MMIO;
1314 if ((r || vcpu->mmio_is_write) && run) {
1315 run->exit_reason = KVM_EXIT_MMIO;
1316 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1317 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1318 run->mmio.len = vcpu->mmio_size;
1319 run->mmio.is_write = vcpu->mmio_is_write;
1323 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1324 return EMULATE_DONE;
1325 if (!vcpu->mmio_needed) {
1326 kvm_report_emulation_failure(vcpu, "mmio");
1327 return EMULATE_FAIL;
1329 return EMULATE_DO_MMIO;
1332 kvm_x86_ops->decache_regs(vcpu);
1333 kvm_x86_ops->set_rflags(vcpu, vcpu->emulate_ctxt.eflags);
1335 if (vcpu->mmio_is_write) {
1336 vcpu->mmio_needed = 0;
1337 return EMULATE_DO_MMIO;
1340 return EMULATE_DONE;
1342 EXPORT_SYMBOL_GPL(emulate_instruction);
1344 static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
1348 for (i = 0; i < ARRAY_SIZE(vcpu->pio.guest_pages); ++i)
1349 if (vcpu->pio.guest_pages[i]) {
1350 kvm_release_page(vcpu->pio.guest_pages[i]);
1351 vcpu->pio.guest_pages[i] = NULL;
1355 static int pio_copy_data(struct kvm_vcpu *vcpu)
1357 void *p = vcpu->pio_data;
1360 int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;
1362 q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
1365 free_pio_guest_pages(vcpu);
1368 q += vcpu->pio.guest_page_offset;
1369 bytes = vcpu->pio.size * vcpu->pio.cur_count;
1371 memcpy(q, p, bytes);
1373 memcpy(p, q, bytes);
1374 q -= vcpu->pio.guest_page_offset;
1376 free_pio_guest_pages(vcpu);
1380 int complete_pio(struct kvm_vcpu *vcpu)
1382 struct kvm_pio_request *io = &vcpu->pio;
1386 kvm_x86_ops->cache_regs(vcpu);
1390 memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1394 r = pio_copy_data(vcpu);
1396 kvm_x86_ops->cache_regs(vcpu);
1403 delta *= io->cur_count;
1405 * The size of the register should really depend on
1406 * current address size.
1408 vcpu->regs[VCPU_REGS_RCX] -= delta;
1414 vcpu->regs[VCPU_REGS_RDI] += delta;
1416 vcpu->regs[VCPU_REGS_RSI] += delta;
1419 kvm_x86_ops->decache_regs(vcpu);
1421 io->count -= io->cur_count;
1427 static void kernel_pio(struct kvm_io_device *pio_dev,
1428 struct kvm_vcpu *vcpu,
1431 /* TODO: String I/O for in kernel device */
1433 mutex_lock(&vcpu->kvm->lock);
1435 kvm_iodevice_read(pio_dev, vcpu->pio.port,
1439 kvm_iodevice_write(pio_dev, vcpu->pio.port,
1442 mutex_unlock(&vcpu->kvm->lock);
1445 static void pio_string_write(struct kvm_io_device *pio_dev,
1446 struct kvm_vcpu *vcpu)
1448 struct kvm_pio_request *io = &vcpu->pio;
1449 void *pd = vcpu->pio_data;
1452 mutex_lock(&vcpu->kvm->lock);
1453 for (i = 0; i < io->cur_count; i++) {
1454 kvm_iodevice_write(pio_dev, io->port,
1459 mutex_unlock(&vcpu->kvm->lock);
1462 static struct kvm_io_device *vcpu_find_pio_dev(struct kvm_vcpu *vcpu,
1465 return kvm_io_bus_find_dev(&vcpu->kvm->pio_bus, addr);
1468 int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1469 int size, unsigned port)
1471 struct kvm_io_device *pio_dev;
1473 vcpu->run->exit_reason = KVM_EXIT_IO;
1474 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1475 vcpu->run->io.size = vcpu->pio.size = size;
1476 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1477 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = 1;
1478 vcpu->run->io.port = vcpu->pio.port = port;
1480 vcpu->pio.string = 0;
1482 vcpu->pio.guest_page_offset = 0;
1485 kvm_x86_ops->cache_regs(vcpu);
1486 memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
1487 kvm_x86_ops->decache_regs(vcpu);
1489 kvm_x86_ops->skip_emulated_instruction(vcpu);
1491 pio_dev = vcpu_find_pio_dev(vcpu, port);
1493 kernel_pio(pio_dev, vcpu, vcpu->pio_data);
1499 EXPORT_SYMBOL_GPL(kvm_emulate_pio);
1501 int kvm_emulate_pio_string(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
1502 int size, unsigned long count, int down,
1503 gva_t address, int rep, unsigned port)
1505 unsigned now, in_page;
1509 struct kvm_io_device *pio_dev;
1511 vcpu->run->exit_reason = KVM_EXIT_IO;
1512 vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
1513 vcpu->run->io.size = vcpu->pio.size = size;
1514 vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
1515 vcpu->run->io.count = vcpu->pio.count = vcpu->pio.cur_count = count;
1516 vcpu->run->io.port = vcpu->pio.port = port;
1518 vcpu->pio.string = 1;
1519 vcpu->pio.down = down;
1520 vcpu->pio.guest_page_offset = offset_in_page(address);
1521 vcpu->pio.rep = rep;
1524 kvm_x86_ops->skip_emulated_instruction(vcpu);
1529 in_page = PAGE_SIZE - offset_in_page(address);
1531 in_page = offset_in_page(address) + size;
1532 now = min(count, (unsigned long)in_page / size);
1535 * String I/O straddles page boundary. Pin two guest pages
1536 * so that we satisfy atomicity constraints. Do just one
1537 * transaction to avoid complexity.
1544 * String I/O in reverse. Yuck. Kill the guest, fix later.
1546 pr_unimpl(vcpu, "guest string pio down\n");
1550 vcpu->run->io.count = now;
1551 vcpu->pio.cur_count = now;
1553 if (vcpu->pio.cur_count == vcpu->pio.count)
1554 kvm_x86_ops->skip_emulated_instruction(vcpu);
1556 for (i = 0; i < nr_pages; ++i) {
1557 mutex_lock(&vcpu->kvm->lock);
1558 page = gva_to_page(vcpu, address + i * PAGE_SIZE);
1559 vcpu->pio.guest_pages[i] = page;
1560 mutex_unlock(&vcpu->kvm->lock);
1563 free_pio_guest_pages(vcpu);
1568 pio_dev = vcpu_find_pio_dev(vcpu, port);
1569 if (!vcpu->pio.in) {
1570 /* string PIO write */
1571 ret = pio_copy_data(vcpu);
1572 if (ret >= 0 && pio_dev) {
1573 pio_string_write(pio_dev, vcpu);
1575 if (vcpu->pio.count == 0)
1579 pr_unimpl(vcpu, "no string pio read support yet, "
1580 "port %x size %d count %ld\n",
1585 EXPORT_SYMBOL_GPL(kvm_emulate_pio_string);
1587 __init void kvm_arch_init(void)
1589 kvm_init_msr_list();