2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm.h>
21 #include <linux/module.h>
22 #include <linux/errno.h>
23 #include <asm/processor.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
28 #include <linux/miscdevice.h>
29 #include <linux/vmalloc.h>
30 #include <asm/uaccess.h>
31 #include <linux/reboot.h>
33 #include <linux/debugfs.h>
34 #include <linux/highmem.h>
35 #include <linux/file.h>
38 #include "x86_emulate.h"
39 #include "segment_descriptor.h"
41 MODULE_AUTHOR("Qumranet");
42 MODULE_LICENSE("GPL");
44 struct kvm_arch_ops *kvm_arch_ops;
45 struct kvm_stat kvm_stat;
46 EXPORT_SYMBOL_GPL(kvm_stat);
48 static struct kvm_stats_debugfs_item {
51 struct dentry *dentry;
52 } debugfs_entries[] = {
53 { "pf_fixed", &kvm_stat.pf_fixed },
54 { "pf_guest", &kvm_stat.pf_guest },
55 { "tlb_flush", &kvm_stat.tlb_flush },
56 { "invlpg", &kvm_stat.invlpg },
57 { "exits", &kvm_stat.exits },
58 { "io_exits", &kvm_stat.io_exits },
59 { "mmio_exits", &kvm_stat.mmio_exits },
60 { "signal_exits", &kvm_stat.signal_exits },
61 { "irq_window", &kvm_stat.irq_window_exits },
62 { "halt_exits", &kvm_stat.halt_exits },
63 { "request_irq", &kvm_stat.request_irq_exits },
64 { "irq_exits", &kvm_stat.irq_exits },
68 static struct dentry *debugfs_dir;
70 #define MAX_IO_MSRS 256
72 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
73 #define LMSW_GUEST_MASK 0x0eULL
74 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
75 #define CR8_RESEVED_BITS (~0x0fULL)
76 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
79 // LDT or TSS descriptor in the GDT. 16 bytes.
80 struct segment_descriptor_64 {
81 struct segment_descriptor s;
88 unsigned long segment_base(u16 selector)
90 struct descriptor_table gdt;
91 struct segment_descriptor *d;
92 unsigned long table_base;
93 typedef unsigned long ul;
99 asm ("sgdt %0" : "=m"(gdt));
100 table_base = gdt.base;
102 if (selector & 4) { /* from ldt */
105 asm ("sldt %0" : "=g"(ldt_selector));
106 table_base = segment_base(ldt_selector);
108 d = (struct segment_descriptor *)(table_base + (selector & ~7));
109 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
112 && (d->type == 2 || d->type == 9 || d->type == 11))
113 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
117 EXPORT_SYMBOL_GPL(segment_base);
119 static inline int valid_vcpu(int n)
121 return likely(n >= 0 && n < KVM_MAX_VCPUS);
124 int kvm_read_guest(struct kvm_vcpu *vcpu,
129 unsigned char *host_buf = dest;
130 unsigned long req_size = size;
138 paddr = gva_to_hpa(vcpu, addr);
140 if (is_error_hpa(paddr))
143 guest_buf = (hva_t)kmap_atomic(
144 pfn_to_page(paddr >> PAGE_SHIFT),
146 offset = addr & ~PAGE_MASK;
148 now = min(size, PAGE_SIZE - offset);
149 memcpy(host_buf, (void*)guest_buf, now);
153 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
155 return req_size - size;
157 EXPORT_SYMBOL_GPL(kvm_read_guest);
159 int kvm_write_guest(struct kvm_vcpu *vcpu,
164 unsigned char *host_buf = data;
165 unsigned long req_size = size;
173 paddr = gva_to_hpa(vcpu, addr);
175 if (is_error_hpa(paddr))
178 guest_buf = (hva_t)kmap_atomic(
179 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
180 offset = addr & ~PAGE_MASK;
182 now = min(size, PAGE_SIZE - offset);
183 memcpy((void*)guest_buf, host_buf, now);
187 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
189 return req_size - size;
191 EXPORT_SYMBOL_GPL(kvm_write_guest);
193 static int vcpu_slot(struct kvm_vcpu *vcpu)
195 return vcpu - vcpu->kvm->vcpus;
199 * Switches to specified vcpu, until a matching vcpu_put()
201 static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
203 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
205 mutex_lock(&vcpu->mutex);
206 if (unlikely(!vcpu->vmcs)) {
207 mutex_unlock(&vcpu->mutex);
210 return kvm_arch_ops->vcpu_load(vcpu);
213 static void vcpu_put(struct kvm_vcpu *vcpu)
215 kvm_arch_ops->vcpu_put(vcpu);
216 mutex_unlock(&vcpu->mutex);
219 static int kvm_dev_open(struct inode *inode, struct file *filp)
221 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
227 spin_lock_init(&kvm->lock);
228 INIT_LIST_HEAD(&kvm->active_mmu_pages);
229 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
230 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
232 mutex_init(&vcpu->mutex);
234 vcpu->mmu.root_hpa = INVALID_PAGE;
235 INIT_LIST_HEAD(&vcpu->free_pages);
237 filp->private_data = kvm;
242 * Free any memory in @free but not in @dont.
244 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
245 struct kvm_memory_slot *dont)
249 if (!dont || free->phys_mem != dont->phys_mem)
250 if (free->phys_mem) {
251 for (i = 0; i < free->npages; ++i)
252 if (free->phys_mem[i])
253 __free_page(free->phys_mem[i]);
254 vfree(free->phys_mem);
257 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
258 vfree(free->dirty_bitmap);
260 free->phys_mem = NULL;
262 free->dirty_bitmap = NULL;
265 static void kvm_free_physmem(struct kvm *kvm)
269 for (i = 0; i < kvm->nmemslots; ++i)
270 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
273 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
275 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
278 kvm_mmu_destroy(vcpu);
280 kvm_arch_ops->vcpu_free(vcpu);
283 static void kvm_free_vcpus(struct kvm *kvm)
287 for (i = 0; i < KVM_MAX_VCPUS; ++i)
288 kvm_free_vcpu(&kvm->vcpus[i]);
291 static int kvm_dev_release(struct inode *inode, struct file *filp)
293 struct kvm *kvm = filp->private_data;
296 kvm_free_physmem(kvm);
301 static void inject_gp(struct kvm_vcpu *vcpu)
303 kvm_arch_ops->inject_gp(vcpu, 0);
307 * Load the pae pdptrs. Return true is they are all valid.
309 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
311 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
312 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
317 struct kvm_memory_slot *memslot;
319 spin_lock(&vcpu->kvm->lock);
320 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
321 /* FIXME: !memslot - emulate? 0xff? */
322 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
325 for (i = 0; i < 4; ++i) {
326 pdpte = pdpt[offset + i];
327 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
333 for (i = 0; i < 4; ++i)
334 vcpu->pdptrs[i] = pdpt[offset + i];
337 kunmap_atomic(pdpt, KM_USER0);
338 spin_unlock(&vcpu->kvm->lock);
343 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
345 if (cr0 & CR0_RESEVED_BITS) {
346 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
352 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
353 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
358 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
359 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
360 "and a clear PE flag\n");
365 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
367 if ((vcpu->shadow_efer & EFER_LME)) {
371 printk(KERN_DEBUG "set_cr0: #GP, start paging "
372 "in long mode while PAE is disabled\n");
376 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
378 printk(KERN_DEBUG "set_cr0: #GP, start paging "
379 "in long mode while CS.L == 1\n");
386 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
387 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
395 kvm_arch_ops->set_cr0(vcpu, cr0);
398 spin_lock(&vcpu->kvm->lock);
399 kvm_mmu_reset_context(vcpu);
400 spin_unlock(&vcpu->kvm->lock);
403 EXPORT_SYMBOL_GPL(set_cr0);
405 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
407 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
408 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
410 EXPORT_SYMBOL_GPL(lmsw);
412 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
414 if (cr4 & CR4_RESEVED_BITS) {
415 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
420 if (is_long_mode(vcpu)) {
421 if (!(cr4 & CR4_PAE_MASK)) {
422 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
427 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
428 && !load_pdptrs(vcpu, vcpu->cr3)) {
429 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
433 if (cr4 & CR4_VMXE_MASK) {
434 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
438 kvm_arch_ops->set_cr4(vcpu, cr4);
439 spin_lock(&vcpu->kvm->lock);
440 kvm_mmu_reset_context(vcpu);
441 spin_unlock(&vcpu->kvm->lock);
443 EXPORT_SYMBOL_GPL(set_cr4);
445 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
447 if (is_long_mode(vcpu)) {
448 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
449 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
454 if (cr3 & CR3_RESEVED_BITS) {
455 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
459 if (is_paging(vcpu) && is_pae(vcpu) &&
460 !load_pdptrs(vcpu, cr3)) {
461 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
469 spin_lock(&vcpu->kvm->lock);
471 * Does the new cr3 value map to physical memory? (Note, we
472 * catch an invalid cr3 even in real-mode, because it would
473 * cause trouble later on when we turn on paging anyway.)
475 * A real CPU would silently accept an invalid cr3 and would
476 * attempt to use it - with largely undefined (and often hard
477 * to debug) behavior on the guest side.
479 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
482 vcpu->mmu.new_cr3(vcpu);
483 spin_unlock(&vcpu->kvm->lock);
485 EXPORT_SYMBOL_GPL(set_cr3);
487 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
489 if ( cr8 & CR8_RESEVED_BITS) {
490 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
496 EXPORT_SYMBOL_GPL(set_cr8);
498 void fx_init(struct kvm_vcpu *vcpu)
500 struct __attribute__ ((__packed__)) fx_image_s {
506 u64 operand;// fpu dp
512 fx_save(vcpu->host_fx_image);
514 fx_save(vcpu->guest_fx_image);
515 fx_restore(vcpu->host_fx_image);
517 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
518 fx_image->mxcsr = 0x1f80;
519 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
520 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
522 EXPORT_SYMBOL_GPL(fx_init);
525 * Creates some virtual cpus. Good luck creating more than one.
527 static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
530 struct kvm_vcpu *vcpu;
536 vcpu = &kvm->vcpus[n];
538 mutex_lock(&vcpu->mutex);
541 mutex_unlock(&vcpu->mutex);
545 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
547 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
549 vcpu->cpu = -1; /* First load will set up TR */
550 r = kvm_arch_ops->vcpu_create(vcpu);
554 r = kvm_mmu_create(vcpu);
558 kvm_arch_ops->vcpu_load(vcpu);
559 r = kvm_mmu_setup(vcpu);
561 r = kvm_arch_ops->vcpu_setup(vcpu);
571 mutex_unlock(&vcpu->mutex);
577 * Allocate some memory and give it an address in the guest physical address
580 * Discontiguous memory is allowed, mostly for framebuffers.
582 static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
583 struct kvm_memory_region *mem)
587 unsigned long npages;
589 struct kvm_memory_slot *memslot;
590 struct kvm_memory_slot old, new;
591 int memory_config_version;
594 /* General sanity checks */
595 if (mem->memory_size & (PAGE_SIZE - 1))
597 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
599 if (mem->slot >= KVM_MEMORY_SLOTS)
601 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
604 memslot = &kvm->memslots[mem->slot];
605 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
606 npages = mem->memory_size >> PAGE_SHIFT;
609 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
612 spin_lock(&kvm->lock);
614 memory_config_version = kvm->memory_config_version;
615 new = old = *memslot;
617 new.base_gfn = base_gfn;
619 new.flags = mem->flags;
621 /* Disallow changing a memory slot's size. */
623 if (npages && old.npages && npages != old.npages)
626 /* Check for overlaps */
628 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
629 struct kvm_memory_slot *s = &kvm->memslots[i];
633 if (!((base_gfn + npages <= s->base_gfn) ||
634 (base_gfn >= s->base_gfn + s->npages)))
638 * Do memory allocations outside lock. memory_config_version will
641 spin_unlock(&kvm->lock);
643 /* Deallocate if slot is being removed */
647 /* Free page dirty bitmap if unneeded */
648 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
649 new.dirty_bitmap = NULL;
653 /* Allocate if a slot is being created */
654 if (npages && !new.phys_mem) {
655 new.phys_mem = vmalloc(npages * sizeof(struct page *));
660 memset(new.phys_mem, 0, npages * sizeof(struct page *));
661 for (i = 0; i < npages; ++i) {
662 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
664 if (!new.phys_mem[i])
666 new.phys_mem[i]->private = 0;
670 /* Allocate page dirty bitmap if needed */
671 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
672 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
674 new.dirty_bitmap = vmalloc(dirty_bytes);
675 if (!new.dirty_bitmap)
677 memset(new.dirty_bitmap, 0, dirty_bytes);
680 spin_lock(&kvm->lock);
682 if (memory_config_version != kvm->memory_config_version) {
683 spin_unlock(&kvm->lock);
684 kvm_free_physmem_slot(&new, &old);
692 if (mem->slot >= kvm->nmemslots)
693 kvm->nmemslots = mem->slot + 1;
696 ++kvm->memory_config_version;
698 spin_unlock(&kvm->lock);
700 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
701 struct kvm_vcpu *vcpu;
703 vcpu = vcpu_load(kvm, i);
706 kvm_mmu_reset_context(vcpu);
710 kvm_free_physmem_slot(&old, &new);
714 spin_unlock(&kvm->lock);
716 kvm_free_physmem_slot(&new, &old);
721 static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
723 spin_lock(&vcpu->kvm->lock);
724 kvm_mmu_slot_remove_write_access(vcpu, slot);
725 spin_unlock(&vcpu->kvm->lock);
729 * Get (and clear) the dirty memory log for a memory slot.
731 static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
732 struct kvm_dirty_log *log)
734 struct kvm_memory_slot *memslot;
738 unsigned long any = 0;
740 spin_lock(&kvm->lock);
743 * Prevent changes to guest memory configuration even while the lock
747 spin_unlock(&kvm->lock);
749 if (log->slot >= KVM_MEMORY_SLOTS)
752 memslot = &kvm->memslots[log->slot];
754 if (!memslot->dirty_bitmap)
757 n = ALIGN(memslot->npages, 8) / 8;
759 for (i = 0; !any && i < n; ++i)
760 any = memslot->dirty_bitmap[i];
763 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
769 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
770 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
775 do_remove_write_access(vcpu, log->slot);
776 memset(memslot->dirty_bitmap, 0, n);
779 kvm_arch_ops->tlb_flush(vcpu);
787 spin_lock(&kvm->lock);
789 spin_unlock(&kvm->lock);
793 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
797 for (i = 0; i < kvm->nmemslots; ++i) {
798 struct kvm_memory_slot *memslot = &kvm->memslots[i];
800 if (gfn >= memslot->base_gfn
801 && gfn < memslot->base_gfn + memslot->npages)
806 EXPORT_SYMBOL_GPL(gfn_to_memslot);
808 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
811 struct kvm_memory_slot *memslot = NULL;
812 unsigned long rel_gfn;
814 for (i = 0; i < kvm->nmemslots; ++i) {
815 memslot = &kvm->memslots[i];
817 if (gfn >= memslot->base_gfn
818 && gfn < memslot->base_gfn + memslot->npages) {
820 if (!memslot || !memslot->dirty_bitmap)
823 rel_gfn = gfn - memslot->base_gfn;
826 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
827 set_bit(rel_gfn, memslot->dirty_bitmap);
833 static int emulator_read_std(unsigned long addr,
836 struct x86_emulate_ctxt *ctxt)
838 struct kvm_vcpu *vcpu = ctxt->vcpu;
842 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
843 unsigned offset = addr & (PAGE_SIZE-1);
844 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
846 struct kvm_memory_slot *memslot;
849 if (gpa == UNMAPPED_GVA)
850 return X86EMUL_PROPAGATE_FAULT;
851 pfn = gpa >> PAGE_SHIFT;
852 memslot = gfn_to_memslot(vcpu->kvm, pfn);
854 return X86EMUL_UNHANDLEABLE;
855 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
857 memcpy(data, page + offset, tocopy);
859 kunmap_atomic(page, KM_USER0);
866 return X86EMUL_CONTINUE;
869 static int emulator_write_std(unsigned long addr,
872 struct x86_emulate_ctxt *ctxt)
874 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
876 return X86EMUL_UNHANDLEABLE;
879 static int emulator_read_emulated(unsigned long addr,
882 struct x86_emulate_ctxt *ctxt)
884 struct kvm_vcpu *vcpu = ctxt->vcpu;
886 if (vcpu->mmio_read_completed) {
887 memcpy(val, vcpu->mmio_data, bytes);
888 vcpu->mmio_read_completed = 0;
889 return X86EMUL_CONTINUE;
890 } else if (emulator_read_std(addr, val, bytes, ctxt)
892 return X86EMUL_CONTINUE;
894 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
895 if (gpa == UNMAPPED_GVA)
896 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
897 vcpu->mmio_needed = 1;
898 vcpu->mmio_phys_addr = gpa;
899 vcpu->mmio_size = bytes;
900 vcpu->mmio_is_write = 0;
902 return X86EMUL_UNHANDLEABLE;
906 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
907 unsigned long val, int bytes)
909 struct kvm_memory_slot *m;
913 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
915 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
918 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
919 kvm_mmu_pre_write(vcpu, gpa, bytes);
920 virt = kmap_atomic(page, KM_USER0);
921 memcpy(virt + offset_in_page(gpa), &val, bytes);
922 kunmap_atomic(virt, KM_USER0);
923 kvm_mmu_post_write(vcpu, gpa, bytes);
927 static int emulator_write_emulated(unsigned long addr,
930 struct x86_emulate_ctxt *ctxt)
932 struct kvm_vcpu *vcpu = ctxt->vcpu;
933 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
935 if (gpa == UNMAPPED_GVA)
936 return X86EMUL_PROPAGATE_FAULT;
938 if (emulator_write_phys(vcpu, gpa, val, bytes))
939 return X86EMUL_CONTINUE;
941 vcpu->mmio_needed = 1;
942 vcpu->mmio_phys_addr = gpa;
943 vcpu->mmio_size = bytes;
944 vcpu->mmio_is_write = 1;
945 memcpy(vcpu->mmio_data, &val, bytes);
947 return X86EMUL_CONTINUE;
950 static int emulator_cmpxchg_emulated(unsigned long addr,
954 struct x86_emulate_ctxt *ctxt)
960 printk(KERN_WARNING "kvm: emulating exchange as write\n");
962 return emulator_write_emulated(addr, new, bytes, ctxt);
967 static int emulator_cmpxchg8b_emulated(unsigned long addr,
968 unsigned long old_lo,
969 unsigned long old_hi,
970 unsigned long new_lo,
971 unsigned long new_hi,
972 struct x86_emulate_ctxt *ctxt)
979 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
981 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
982 if (r != X86EMUL_CONTINUE)
984 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
989 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
991 return kvm_arch_ops->get_segment_base(vcpu, seg);
994 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
996 return X86EMUL_CONTINUE;
999 int emulate_clts(struct kvm_vcpu *vcpu)
1003 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1004 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
1005 kvm_arch_ops->set_cr0(vcpu, cr0);
1006 return X86EMUL_CONTINUE;
1009 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1011 struct kvm_vcpu *vcpu = ctxt->vcpu;
1015 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1016 return X86EMUL_CONTINUE;
1018 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1020 return X86EMUL_UNHANDLEABLE;
1024 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1026 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1029 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1031 /* FIXME: better handling */
1032 return X86EMUL_UNHANDLEABLE;
1034 return X86EMUL_CONTINUE;
1037 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1039 static int reported;
1041 unsigned long rip = ctxt->vcpu->rip;
1042 unsigned long rip_linear;
1044 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1049 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1051 printk(KERN_ERR "emulation failed but !mmio_needed?"
1052 " rip %lx %02x %02x %02x %02x\n",
1053 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1057 struct x86_emulate_ops emulate_ops = {
1058 .read_std = emulator_read_std,
1059 .write_std = emulator_write_std,
1060 .read_emulated = emulator_read_emulated,
1061 .write_emulated = emulator_write_emulated,
1062 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1063 #ifdef CONFIG_X86_32
1064 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1068 int emulate_instruction(struct kvm_vcpu *vcpu,
1069 struct kvm_run *run,
1073 struct x86_emulate_ctxt emulate_ctxt;
1077 kvm_arch_ops->cache_regs(vcpu);
1079 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1081 emulate_ctxt.vcpu = vcpu;
1082 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1083 emulate_ctxt.cr2 = cr2;
1084 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1085 ? X86EMUL_MODE_REAL : cs_l
1086 ? X86EMUL_MODE_PROT64 : cs_db
1087 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1089 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1090 emulate_ctxt.cs_base = 0;
1091 emulate_ctxt.ds_base = 0;
1092 emulate_ctxt.es_base = 0;
1093 emulate_ctxt.ss_base = 0;
1095 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1096 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1097 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1098 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1101 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1102 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1104 vcpu->mmio_is_write = 0;
1105 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1107 if ((r || vcpu->mmio_is_write) && run) {
1108 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1109 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1110 run->mmio.len = vcpu->mmio_size;
1111 run->mmio.is_write = vcpu->mmio_is_write;
1115 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1116 return EMULATE_DONE;
1117 if (!vcpu->mmio_needed) {
1118 report_emulation_failure(&emulate_ctxt);
1119 return EMULATE_FAIL;
1121 return EMULATE_DO_MMIO;
1124 kvm_arch_ops->decache_regs(vcpu);
1125 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1127 if (vcpu->mmio_is_write)
1128 return EMULATE_DO_MMIO;
1130 return EMULATE_DONE;
1132 EXPORT_SYMBOL_GPL(emulate_instruction);
1134 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1136 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1139 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1141 struct descriptor_table dt = { limit, base };
1143 kvm_arch_ops->set_gdt(vcpu, &dt);
1146 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1148 struct descriptor_table dt = { limit, base };
1150 kvm_arch_ops->set_idt(vcpu, &dt);
1153 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1154 unsigned long *rflags)
1157 *rflags = kvm_arch_ops->get_rflags(vcpu);
1160 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1162 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1173 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1178 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1179 unsigned long *rflags)
1183 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1184 *rflags = kvm_arch_ops->get_rflags(vcpu);
1193 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1196 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1200 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1205 case 0xc0010010: /* SYSCFG */
1206 case 0xc0010015: /* HWCR */
1207 case MSR_IA32_PLATFORM_ID:
1208 case MSR_IA32_P5_MC_ADDR:
1209 case MSR_IA32_P5_MC_TYPE:
1210 case MSR_IA32_MC0_CTL:
1211 case MSR_IA32_MCG_STATUS:
1212 case MSR_IA32_MCG_CAP:
1213 case MSR_IA32_MC0_MISC:
1214 case MSR_IA32_MC0_MISC+4:
1215 case MSR_IA32_MC0_MISC+8:
1216 case MSR_IA32_MC0_MISC+12:
1217 case MSR_IA32_MC0_MISC+16:
1218 case MSR_IA32_UCODE_REV:
1219 case MSR_IA32_PERF_STATUS:
1220 /* MTRR registers */
1222 case 0x200 ... 0x2ff:
1225 case 0xcd: /* fsb frequency */
1228 case MSR_IA32_APICBASE:
1229 data = vcpu->apic_base;
1231 case MSR_IA32_MISC_ENABLE:
1232 data = vcpu->ia32_misc_enable_msr;
1234 #ifdef CONFIG_X86_64
1236 data = vcpu->shadow_efer;
1240 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1246 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1249 * Reads an msr value (of 'msr_index') into 'pdata'.
1250 * Returns 0 on success, non-0 otherwise.
1251 * Assumes vcpu_load() was already called.
1253 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1255 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1258 #ifdef CONFIG_X86_64
1260 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1262 if (efer & EFER_RESERVED_BITS) {
1263 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1270 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1271 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1276 kvm_arch_ops->set_efer(vcpu, efer);
1279 efer |= vcpu->shadow_efer & EFER_LMA;
1281 vcpu->shadow_efer = efer;
1286 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1289 #ifdef CONFIG_X86_64
1291 set_efer(vcpu, data);
1294 case MSR_IA32_MC0_STATUS:
1295 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1296 __FUNCTION__, data);
1298 case MSR_IA32_UCODE_REV:
1299 case MSR_IA32_UCODE_WRITE:
1300 case 0x200 ... 0x2ff: /* MTRRs */
1302 case MSR_IA32_APICBASE:
1303 vcpu->apic_base = data;
1305 case MSR_IA32_MISC_ENABLE:
1306 vcpu->ia32_misc_enable_msr = data;
1309 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1314 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1317 * Writes msr value into into the appropriate "register".
1318 * Returns 0 on success, non-0 otherwise.
1319 * Assumes vcpu_load() was already called.
1321 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1323 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1326 void kvm_resched(struct kvm_vcpu *vcpu)
1330 /* Cannot fail - no vcpu unplug yet. */
1331 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1333 EXPORT_SYMBOL_GPL(kvm_resched);
1335 void load_msrs(struct vmx_msr_entry *e, int n)
1339 for (i = 0; i < n; ++i)
1340 wrmsrl(e[i].index, e[i].data);
1342 EXPORT_SYMBOL_GPL(load_msrs);
1344 void save_msrs(struct vmx_msr_entry *e, int n)
1348 for (i = 0; i < n; ++i)
1349 rdmsrl(e[i].index, e[i].data);
1351 EXPORT_SYMBOL_GPL(save_msrs);
1353 static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1355 struct kvm_vcpu *vcpu;
1358 if (!valid_vcpu(kvm_run->vcpu))
1361 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1365 /* re-sync apic's tpr */
1366 vcpu->cr8 = kvm_run->cr8;
1368 if (kvm_run->emulated) {
1369 kvm_arch_ops->skip_emulated_instruction(vcpu);
1370 kvm_run->emulated = 0;
1373 if (kvm_run->mmio_completed) {
1374 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1375 vcpu->mmio_read_completed = 1;
1378 vcpu->mmio_needed = 0;
1380 r = kvm_arch_ops->run(vcpu, kvm_run);
1386 static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1388 struct kvm_vcpu *vcpu;
1390 if (!valid_vcpu(regs->vcpu))
1393 vcpu = vcpu_load(kvm, regs->vcpu);
1397 kvm_arch_ops->cache_regs(vcpu);
1399 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1400 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1401 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1402 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1403 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1404 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1405 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1406 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1407 #ifdef CONFIG_X86_64
1408 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1409 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1410 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1411 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1412 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1413 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1414 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1415 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1418 regs->rip = vcpu->rip;
1419 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1422 * Don't leak debug flags in case they were set for guest debugging
1424 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1425 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1432 static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1434 struct kvm_vcpu *vcpu;
1436 if (!valid_vcpu(regs->vcpu))
1439 vcpu = vcpu_load(kvm, regs->vcpu);
1443 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1444 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1445 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1446 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1447 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1448 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1449 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1450 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1451 #ifdef CONFIG_X86_64
1452 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1453 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1454 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1455 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1456 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1457 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1458 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1459 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1462 vcpu->rip = regs->rip;
1463 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1465 kvm_arch_ops->decache_regs(vcpu);
1472 static void get_segment(struct kvm_vcpu *vcpu,
1473 struct kvm_segment *var, int seg)
1475 return kvm_arch_ops->get_segment(vcpu, var, seg);
1478 static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1480 struct kvm_vcpu *vcpu;
1481 struct descriptor_table dt;
1483 if (!valid_vcpu(sregs->vcpu))
1485 vcpu = vcpu_load(kvm, sregs->vcpu);
1489 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1490 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1491 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1492 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1493 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1494 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1496 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1497 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1499 kvm_arch_ops->get_idt(vcpu, &dt);
1500 sregs->idt.limit = dt.limit;
1501 sregs->idt.base = dt.base;
1502 kvm_arch_ops->get_gdt(vcpu, &dt);
1503 sregs->gdt.limit = dt.limit;
1504 sregs->gdt.base = dt.base;
1506 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1507 sregs->cr0 = vcpu->cr0;
1508 sregs->cr2 = vcpu->cr2;
1509 sregs->cr3 = vcpu->cr3;
1510 sregs->cr4 = vcpu->cr4;
1511 sregs->cr8 = vcpu->cr8;
1512 sregs->efer = vcpu->shadow_efer;
1513 sregs->apic_base = vcpu->apic_base;
1515 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1516 sizeof sregs->interrupt_bitmap);
1523 static void set_segment(struct kvm_vcpu *vcpu,
1524 struct kvm_segment *var, int seg)
1526 return kvm_arch_ops->set_segment(vcpu, var, seg);
1529 static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1531 struct kvm_vcpu *vcpu;
1532 int mmu_reset_needed = 0;
1534 struct descriptor_table dt;
1536 if (!valid_vcpu(sregs->vcpu))
1538 vcpu = vcpu_load(kvm, sregs->vcpu);
1542 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1543 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1544 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1545 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1546 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1547 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1549 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1550 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1552 dt.limit = sregs->idt.limit;
1553 dt.base = sregs->idt.base;
1554 kvm_arch_ops->set_idt(vcpu, &dt);
1555 dt.limit = sregs->gdt.limit;
1556 dt.base = sregs->gdt.base;
1557 kvm_arch_ops->set_gdt(vcpu, &dt);
1559 vcpu->cr2 = sregs->cr2;
1560 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1561 vcpu->cr3 = sregs->cr3;
1563 vcpu->cr8 = sregs->cr8;
1565 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1566 #ifdef CONFIG_X86_64
1567 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1569 vcpu->apic_base = sregs->apic_base;
1571 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1573 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1574 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1576 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1577 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1578 if (!is_long_mode(vcpu) && is_pae(vcpu))
1579 load_pdptrs(vcpu, vcpu->cr3);
1581 if (mmu_reset_needed)
1582 kvm_mmu_reset_context(vcpu);
1584 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1585 sizeof vcpu->irq_pending);
1586 vcpu->irq_summary = 0;
1587 for (i = 0; i < NR_IRQ_WORDS; ++i)
1588 if (vcpu->irq_pending[i])
1589 __set_bit(i, &vcpu->irq_summary);
1597 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1598 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1600 * This list is modified at module load time to reflect the
1601 * capabilities of the host cpu.
1603 static u32 msrs_to_save[] = {
1604 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1606 #ifdef CONFIG_X86_64
1607 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1609 MSR_IA32_TIME_STAMP_COUNTER,
1612 static unsigned num_msrs_to_save;
1614 static u32 emulated_msrs[] = {
1615 MSR_IA32_MISC_ENABLE,
1618 static __init void kvm_init_msr_list(void)
1623 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1624 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1627 msrs_to_save[j] = msrs_to_save[i];
1630 num_msrs_to_save = j;
1634 * Adapt set_msr() to msr_io()'s calling convention
1636 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1638 return set_msr(vcpu, index, *data);
1642 * Read or write a bunch of msrs. All parameters are kernel addresses.
1644 * @return number of msrs set successfully.
1646 static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1647 struct kvm_msr_entry *entries,
1648 int (*do_msr)(struct kvm_vcpu *vcpu,
1649 unsigned index, u64 *data))
1651 struct kvm_vcpu *vcpu;
1654 if (!valid_vcpu(msrs->vcpu))
1657 vcpu = vcpu_load(kvm, msrs->vcpu);
1661 for (i = 0; i < msrs->nmsrs; ++i)
1662 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1671 * Read or write a bunch of msrs. Parameters are user addresses.
1673 * @return number of msrs set successfully.
1675 static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1676 int (*do_msr)(struct kvm_vcpu *vcpu,
1677 unsigned index, u64 *data),
1680 struct kvm_msrs msrs;
1681 struct kvm_msr_entry *entries;
1686 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1690 if (msrs.nmsrs >= MAX_IO_MSRS)
1694 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1695 entries = vmalloc(size);
1700 if (copy_from_user(entries, user_msrs->entries, size))
1703 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1708 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1720 * Translate a guest virtual address to a guest physical address.
1722 static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1724 unsigned long vaddr = tr->linear_address;
1725 struct kvm_vcpu *vcpu;
1728 vcpu = vcpu_load(kvm, tr->vcpu);
1731 spin_lock(&kvm->lock);
1732 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1733 tr->physical_address = gpa;
1734 tr->valid = gpa != UNMAPPED_GVA;
1737 spin_unlock(&kvm->lock);
1743 static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1745 struct kvm_vcpu *vcpu;
1747 if (!valid_vcpu(irq->vcpu))
1749 if (irq->irq < 0 || irq->irq >= 256)
1751 vcpu = vcpu_load(kvm, irq->vcpu);
1755 set_bit(irq->irq, vcpu->irq_pending);
1756 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1763 static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1764 struct kvm_debug_guest *dbg)
1766 struct kvm_vcpu *vcpu;
1769 if (!valid_vcpu(dbg->vcpu))
1771 vcpu = vcpu_load(kvm, dbg->vcpu);
1775 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1782 static long kvm_dev_ioctl(struct file *filp,
1783 unsigned int ioctl, unsigned long arg)
1785 struct kvm *kvm = filp->private_data;
1786 void __user *argp = (void __user *)arg;
1790 case KVM_GET_API_VERSION:
1791 r = KVM_API_VERSION;
1793 case KVM_CREATE_VCPU: {
1794 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1800 struct kvm_run kvm_run;
1803 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
1805 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1806 if (r < 0 && r != -EINTR)
1808 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
1814 case KVM_GET_REGS: {
1815 struct kvm_regs kvm_regs;
1818 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
1820 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1824 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
1829 case KVM_SET_REGS: {
1830 struct kvm_regs kvm_regs;
1833 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
1835 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1841 case KVM_GET_SREGS: {
1842 struct kvm_sregs kvm_sregs;
1845 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1847 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1851 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
1856 case KVM_SET_SREGS: {
1857 struct kvm_sregs kvm_sregs;
1860 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1862 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1868 case KVM_TRANSLATE: {
1869 struct kvm_translation tr;
1872 if (copy_from_user(&tr, argp, sizeof tr))
1874 r = kvm_dev_ioctl_translate(kvm, &tr);
1878 if (copy_to_user(argp, &tr, sizeof tr))
1883 case KVM_INTERRUPT: {
1884 struct kvm_interrupt irq;
1887 if (copy_from_user(&irq, argp, sizeof irq))
1889 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1895 case KVM_DEBUG_GUEST: {
1896 struct kvm_debug_guest dbg;
1899 if (copy_from_user(&dbg, argp, sizeof dbg))
1901 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1907 case KVM_SET_MEMORY_REGION: {
1908 struct kvm_memory_region kvm_mem;
1911 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1913 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1918 case KVM_GET_DIRTY_LOG: {
1919 struct kvm_dirty_log log;
1922 if (copy_from_user(&log, argp, sizeof log))
1924 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1930 r = msr_io(kvm, argp, get_msr, 1);
1933 r = msr_io(kvm, argp, do_set_msr, 0);
1935 case KVM_GET_MSR_INDEX_LIST: {
1936 struct kvm_msr_list __user *user_msr_list = argp;
1937 struct kvm_msr_list msr_list;
1941 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1944 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1945 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1948 if (n < num_msrs_to_save)
1951 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1952 num_msrs_to_save * sizeof(u32)))
1954 if (copy_to_user(user_msr_list->indices
1955 + num_msrs_to_save * sizeof(u32),
1957 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1969 static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1970 unsigned long address,
1973 struct kvm *kvm = vma->vm_file->private_data;
1974 unsigned long pgoff;
1975 struct kvm_memory_slot *slot;
1978 *type = VM_FAULT_MINOR;
1979 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1980 slot = gfn_to_memslot(kvm, pgoff);
1982 return NOPAGE_SIGBUS;
1983 page = gfn_to_page(slot, pgoff);
1985 return NOPAGE_SIGBUS;
1990 static struct vm_operations_struct kvm_dev_vm_ops = {
1991 .nopage = kvm_dev_nopage,
1994 static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1996 vma->vm_ops = &kvm_dev_vm_ops;
2000 static struct file_operations kvm_chardev_ops = {
2001 .open = kvm_dev_open,
2002 .release = kvm_dev_release,
2003 .unlocked_ioctl = kvm_dev_ioctl,
2004 .compat_ioctl = kvm_dev_ioctl,
2005 .mmap = kvm_dev_mmap,
2008 static struct miscdevice kvm_dev = {
2014 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2017 if (val == SYS_RESTART) {
2019 * Some (well, at least mine) BIOSes hang on reboot if
2022 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2023 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2028 static struct notifier_block kvm_reboot_notifier = {
2029 .notifier_call = kvm_reboot,
2033 static __init void kvm_init_debug(void)
2035 struct kvm_stats_debugfs_item *p;
2037 debugfs_dir = debugfs_create_dir("kvm", NULL);
2038 for (p = debugfs_entries; p->name; ++p)
2039 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2043 static void kvm_exit_debug(void)
2045 struct kvm_stats_debugfs_item *p;
2047 for (p = debugfs_entries; p->name; ++p)
2048 debugfs_remove(p->dentry);
2049 debugfs_remove(debugfs_dir);
2052 hpa_t bad_page_address;
2054 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2059 printk(KERN_ERR "kvm: already loaded the other module\n");
2063 if (!ops->cpu_has_kvm_support()) {
2064 printk(KERN_ERR "kvm: no hardware support\n");
2067 if (ops->disabled_by_bios()) {
2068 printk(KERN_ERR "kvm: disabled by bios\n");
2074 r = kvm_arch_ops->hardware_setup();
2078 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2079 register_reboot_notifier(&kvm_reboot_notifier);
2081 kvm_chardev_ops.owner = module;
2083 r = misc_register(&kvm_dev);
2085 printk (KERN_ERR "kvm: misc device register failed\n");
2092 unregister_reboot_notifier(&kvm_reboot_notifier);
2093 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2094 kvm_arch_ops->hardware_unsetup();
2098 void kvm_exit_arch(void)
2100 misc_deregister(&kvm_dev);
2102 unregister_reboot_notifier(&kvm_reboot_notifier);
2103 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2104 kvm_arch_ops->hardware_unsetup();
2105 kvm_arch_ops = NULL;
2108 static __init int kvm_init(void)
2110 static struct page *bad_page;
2115 kvm_init_msr_list();
2117 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2122 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2123 memset(__va(bad_page_address), 0, PAGE_SIZE);
2132 static __exit void kvm_exit(void)
2135 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2138 module_init(kvm_init)
2139 module_exit(kvm_exit)
2141 EXPORT_SYMBOL_GPL(kvm_init_arch);
2142 EXPORT_SYMBOL_GPL(kvm_exit_arch);