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);
233 vcpu->mmu.root_hpa = INVALID_PAGE;
234 INIT_LIST_HEAD(&vcpu->free_pages);
236 filp->private_data = kvm;
241 * Free any memory in @free but not in @dont.
243 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
244 struct kvm_memory_slot *dont)
248 if (!dont || free->phys_mem != dont->phys_mem)
249 if (free->phys_mem) {
250 for (i = 0; i < free->npages; ++i)
251 if (free->phys_mem[i])
252 __free_page(free->phys_mem[i]);
253 vfree(free->phys_mem);
256 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
257 vfree(free->dirty_bitmap);
261 free->dirty_bitmap = 0;
264 static void kvm_free_physmem(struct kvm *kvm)
268 for (i = 0; i < kvm->nmemslots; ++i)
269 kvm_free_physmem_slot(&kvm->memslots[i], 0);
272 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
274 kvm_arch_ops->vcpu_free(vcpu);
275 kvm_mmu_destroy(vcpu);
278 static void kvm_free_vcpus(struct kvm *kvm)
282 for (i = 0; i < KVM_MAX_VCPUS; ++i)
283 kvm_free_vcpu(&kvm->vcpus[i]);
286 static int kvm_dev_release(struct inode *inode, struct file *filp)
288 struct kvm *kvm = filp->private_data;
291 kvm_free_physmem(kvm);
296 static void inject_gp(struct kvm_vcpu *vcpu)
298 kvm_arch_ops->inject_gp(vcpu, 0);
302 * Load the pae pdptrs. Return true is they are all valid.
304 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
306 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
307 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
312 struct kvm_memory_slot *memslot;
314 spin_lock(&vcpu->kvm->lock);
315 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
316 /* FIXME: !memslot - emulate? 0xff? */
317 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
320 for (i = 0; i < 4; ++i) {
321 pdpte = pdpt[offset + i];
322 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
328 for (i = 0; i < 4; ++i)
329 vcpu->pdptrs[i] = pdpt[offset + i];
332 kunmap_atomic(pdpt, KM_USER0);
333 spin_unlock(&vcpu->kvm->lock);
338 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
340 if (cr0 & CR0_RESEVED_BITS) {
341 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
347 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
348 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
353 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
354 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
355 "and a clear PE flag\n");
360 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
362 if ((vcpu->shadow_efer & EFER_LME)) {
366 printk(KERN_DEBUG "set_cr0: #GP, start paging "
367 "in long mode while PAE is disabled\n");
371 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
373 printk(KERN_DEBUG "set_cr0: #GP, start paging "
374 "in long mode while CS.L == 1\n");
381 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
382 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
390 kvm_arch_ops->set_cr0(vcpu, cr0);
393 spin_lock(&vcpu->kvm->lock);
394 kvm_mmu_reset_context(vcpu);
395 spin_unlock(&vcpu->kvm->lock);
398 EXPORT_SYMBOL_GPL(set_cr0);
400 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
402 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
403 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
405 EXPORT_SYMBOL_GPL(lmsw);
407 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
409 if (cr4 & CR4_RESEVED_BITS) {
410 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
415 if (is_long_mode(vcpu)) {
416 if (!(cr4 & CR4_PAE_MASK)) {
417 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
422 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
423 && !load_pdptrs(vcpu, vcpu->cr3)) {
424 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
428 if (cr4 & CR4_VMXE_MASK) {
429 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
433 kvm_arch_ops->set_cr4(vcpu, cr4);
434 spin_lock(&vcpu->kvm->lock);
435 kvm_mmu_reset_context(vcpu);
436 spin_unlock(&vcpu->kvm->lock);
438 EXPORT_SYMBOL_GPL(set_cr4);
440 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
442 if (is_long_mode(vcpu)) {
443 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
444 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
449 if (cr3 & CR3_RESEVED_BITS) {
450 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
454 if (is_paging(vcpu) && is_pae(vcpu) &&
455 !load_pdptrs(vcpu, cr3)) {
456 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
464 spin_lock(&vcpu->kvm->lock);
465 vcpu->mmu.new_cr3(vcpu);
466 spin_unlock(&vcpu->kvm->lock);
468 EXPORT_SYMBOL_GPL(set_cr3);
470 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
472 if ( cr8 & CR8_RESEVED_BITS) {
473 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
479 EXPORT_SYMBOL_GPL(set_cr8);
481 void fx_init(struct kvm_vcpu *vcpu)
483 struct __attribute__ ((__packed__)) fx_image_s {
489 u64 operand;// fpu dp
495 fx_save(vcpu->host_fx_image);
497 fx_save(vcpu->guest_fx_image);
498 fx_restore(vcpu->host_fx_image);
500 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
501 fx_image->mxcsr = 0x1f80;
502 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
503 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
505 EXPORT_SYMBOL_GPL(fx_init);
508 * Creates some virtual cpus. Good luck creating more than one.
510 static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
513 struct kvm_vcpu *vcpu;
519 vcpu = &kvm->vcpus[n];
521 mutex_lock(&vcpu->mutex);
524 mutex_unlock(&vcpu->mutex);
528 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
530 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
532 vcpu->cpu = -1; /* First load will set up TR */
534 r = kvm_arch_ops->vcpu_create(vcpu);
538 r = kvm_mmu_create(vcpu);
542 kvm_arch_ops->vcpu_load(vcpu);
543 r = kvm_mmu_setup(vcpu);
545 r = kvm_arch_ops->vcpu_setup(vcpu);
555 mutex_unlock(&vcpu->mutex);
561 * Allocate some memory and give it an address in the guest physical address
564 * Discontiguous memory is allowed, mostly for framebuffers.
566 static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
567 struct kvm_memory_region *mem)
571 unsigned long npages;
573 struct kvm_memory_slot *memslot;
574 struct kvm_memory_slot old, new;
575 int memory_config_version;
578 /* General sanity checks */
579 if (mem->memory_size & (PAGE_SIZE - 1))
581 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
583 if (mem->slot >= KVM_MEMORY_SLOTS)
585 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
588 memslot = &kvm->memslots[mem->slot];
589 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
590 npages = mem->memory_size >> PAGE_SHIFT;
593 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
596 spin_lock(&kvm->lock);
598 memory_config_version = kvm->memory_config_version;
599 new = old = *memslot;
601 new.base_gfn = base_gfn;
603 new.flags = mem->flags;
605 /* Disallow changing a memory slot's size. */
607 if (npages && old.npages && npages != old.npages)
610 /* Check for overlaps */
612 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
613 struct kvm_memory_slot *s = &kvm->memslots[i];
617 if (!((base_gfn + npages <= s->base_gfn) ||
618 (base_gfn >= s->base_gfn + s->npages)))
622 * Do memory allocations outside lock. memory_config_version will
625 spin_unlock(&kvm->lock);
627 /* Deallocate if slot is being removed */
631 /* Free page dirty bitmap if unneeded */
632 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
633 new.dirty_bitmap = 0;
637 /* Allocate if a slot is being created */
638 if (npages && !new.phys_mem) {
639 new.phys_mem = vmalloc(npages * sizeof(struct page *));
644 memset(new.phys_mem, 0, npages * sizeof(struct page *));
645 for (i = 0; i < npages; ++i) {
646 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
648 if (!new.phys_mem[i])
650 new.phys_mem[i]->private = 0;
654 /* Allocate page dirty bitmap if needed */
655 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
656 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
658 new.dirty_bitmap = vmalloc(dirty_bytes);
659 if (!new.dirty_bitmap)
661 memset(new.dirty_bitmap, 0, dirty_bytes);
664 spin_lock(&kvm->lock);
666 if (memory_config_version != kvm->memory_config_version) {
667 spin_unlock(&kvm->lock);
668 kvm_free_physmem_slot(&new, &old);
676 if (mem->slot >= kvm->nmemslots)
677 kvm->nmemslots = mem->slot + 1;
680 ++kvm->memory_config_version;
682 spin_unlock(&kvm->lock);
684 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
685 struct kvm_vcpu *vcpu;
687 vcpu = vcpu_load(kvm, i);
690 kvm_mmu_reset_context(vcpu);
694 kvm_free_physmem_slot(&old, &new);
698 spin_unlock(&kvm->lock);
700 kvm_free_physmem_slot(&new, &old);
706 * Get (and clear) the dirty memory log for a memory slot.
708 static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
709 struct kvm_dirty_log *log)
711 struct kvm_memory_slot *memslot;
714 unsigned long any = 0;
716 spin_lock(&kvm->lock);
719 * Prevent changes to guest memory configuration even while the lock
723 spin_unlock(&kvm->lock);
725 if (log->slot >= KVM_MEMORY_SLOTS)
728 memslot = &kvm->memslots[log->slot];
730 if (!memslot->dirty_bitmap)
733 n = ALIGN(memslot->npages, 8) / 8;
735 for (i = 0; !any && i < n; ++i)
736 any = memslot->dirty_bitmap[i];
739 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
744 spin_lock(&kvm->lock);
745 kvm_mmu_slot_remove_write_access(kvm, log->slot);
746 spin_unlock(&kvm->lock);
747 memset(memslot->dirty_bitmap, 0, n);
748 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
749 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
753 kvm_arch_ops->tlb_flush(vcpu);
761 spin_lock(&kvm->lock);
763 spin_unlock(&kvm->lock);
767 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
771 for (i = 0; i < kvm->nmemslots; ++i) {
772 struct kvm_memory_slot *memslot = &kvm->memslots[i];
774 if (gfn >= memslot->base_gfn
775 && gfn < memslot->base_gfn + memslot->npages)
780 EXPORT_SYMBOL_GPL(gfn_to_memslot);
782 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
785 struct kvm_memory_slot *memslot = 0;
786 unsigned long rel_gfn;
788 for (i = 0; i < kvm->nmemslots; ++i) {
789 memslot = &kvm->memslots[i];
791 if (gfn >= memslot->base_gfn
792 && gfn < memslot->base_gfn + memslot->npages) {
794 if (!memslot || !memslot->dirty_bitmap)
797 rel_gfn = gfn - memslot->base_gfn;
800 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
801 set_bit(rel_gfn, memslot->dirty_bitmap);
807 static int emulator_read_std(unsigned long addr,
810 struct x86_emulate_ctxt *ctxt)
812 struct kvm_vcpu *vcpu = ctxt->vcpu;
816 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
817 unsigned offset = addr & (PAGE_SIZE-1);
818 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
820 struct kvm_memory_slot *memslot;
823 if (gpa == UNMAPPED_GVA)
824 return X86EMUL_PROPAGATE_FAULT;
825 pfn = gpa >> PAGE_SHIFT;
826 memslot = gfn_to_memslot(vcpu->kvm, pfn);
828 return X86EMUL_UNHANDLEABLE;
829 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
831 memcpy(data, page + offset, tocopy);
833 kunmap_atomic(page, KM_USER0);
840 return X86EMUL_CONTINUE;
843 static int emulator_write_std(unsigned long addr,
846 struct x86_emulate_ctxt *ctxt)
848 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
850 return X86EMUL_UNHANDLEABLE;
853 static int emulator_read_emulated(unsigned long addr,
856 struct x86_emulate_ctxt *ctxt)
858 struct kvm_vcpu *vcpu = ctxt->vcpu;
860 if (vcpu->mmio_read_completed) {
861 memcpy(val, vcpu->mmio_data, bytes);
862 vcpu->mmio_read_completed = 0;
863 return X86EMUL_CONTINUE;
864 } else if (emulator_read_std(addr, val, bytes, ctxt)
866 return X86EMUL_CONTINUE;
868 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
869 if (gpa == UNMAPPED_GVA)
870 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
871 vcpu->mmio_needed = 1;
872 vcpu->mmio_phys_addr = gpa;
873 vcpu->mmio_size = bytes;
874 vcpu->mmio_is_write = 0;
876 return X86EMUL_UNHANDLEABLE;
880 static int emulator_write_emulated(unsigned long addr,
883 struct x86_emulate_ctxt *ctxt)
885 struct kvm_vcpu *vcpu = ctxt->vcpu;
886 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
888 if (gpa == UNMAPPED_GVA)
889 return X86EMUL_PROPAGATE_FAULT;
891 vcpu->mmio_needed = 1;
892 vcpu->mmio_phys_addr = gpa;
893 vcpu->mmio_size = bytes;
894 vcpu->mmio_is_write = 1;
895 memcpy(vcpu->mmio_data, &val, bytes);
897 return X86EMUL_CONTINUE;
900 static int emulator_cmpxchg_emulated(unsigned long addr,
904 struct x86_emulate_ctxt *ctxt)
910 printk(KERN_WARNING "kvm: emulating exchange as write\n");
912 return emulator_write_emulated(addr, new, bytes, ctxt);
915 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
917 return kvm_arch_ops->get_segment_base(vcpu, seg);
920 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
922 spin_lock(&vcpu->kvm->lock);
923 vcpu->mmu.inval_page(vcpu, address);
924 spin_unlock(&vcpu->kvm->lock);
925 kvm_arch_ops->invlpg(vcpu, address);
926 return X86EMUL_CONTINUE;
929 int emulate_clts(struct kvm_vcpu *vcpu)
933 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
934 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
935 kvm_arch_ops->set_cr0(vcpu, cr0);
936 return X86EMUL_CONTINUE;
939 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
941 struct kvm_vcpu *vcpu = ctxt->vcpu;
945 *dest = kvm_arch_ops->get_dr(vcpu, dr);
946 return X86EMUL_CONTINUE;
948 printk(KERN_DEBUG "%s: unexpected dr %u\n",
950 return X86EMUL_UNHANDLEABLE;
954 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
956 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
959 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
961 /* FIXME: better handling */
962 return X86EMUL_UNHANDLEABLE;
964 return X86EMUL_CONTINUE;
967 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
971 unsigned long rip = ctxt->vcpu->rip;
972 unsigned long rip_linear;
974 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
979 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
981 printk(KERN_ERR "emulation failed but !mmio_needed?"
982 " rip %lx %02x %02x %02x %02x\n",
983 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
987 struct x86_emulate_ops emulate_ops = {
988 .read_std = emulator_read_std,
989 .write_std = emulator_write_std,
990 .read_emulated = emulator_read_emulated,
991 .write_emulated = emulator_write_emulated,
992 .cmpxchg_emulated = emulator_cmpxchg_emulated,
995 int emulate_instruction(struct kvm_vcpu *vcpu,
1000 struct x86_emulate_ctxt emulate_ctxt;
1004 kvm_arch_ops->cache_regs(vcpu);
1006 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1008 emulate_ctxt.vcpu = vcpu;
1009 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1010 emulate_ctxt.cr2 = cr2;
1011 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1012 ? X86EMUL_MODE_REAL : cs_l
1013 ? X86EMUL_MODE_PROT64 : cs_db
1014 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1016 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1017 emulate_ctxt.cs_base = 0;
1018 emulate_ctxt.ds_base = 0;
1019 emulate_ctxt.es_base = 0;
1020 emulate_ctxt.ss_base = 0;
1022 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1023 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1024 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1025 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1028 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1029 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1031 vcpu->mmio_is_write = 0;
1032 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1034 if ((r || vcpu->mmio_is_write) && run) {
1035 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1036 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1037 run->mmio.len = vcpu->mmio_size;
1038 run->mmio.is_write = vcpu->mmio_is_write;
1042 if (!vcpu->mmio_needed) {
1043 report_emulation_failure(&emulate_ctxt);
1044 return EMULATE_FAIL;
1046 return EMULATE_DO_MMIO;
1049 kvm_arch_ops->decache_regs(vcpu);
1050 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1052 if (vcpu->mmio_is_write)
1053 return EMULATE_DO_MMIO;
1055 return EMULATE_DONE;
1057 EXPORT_SYMBOL_GPL(emulate_instruction);
1059 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1061 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1064 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1066 struct descriptor_table dt = { limit, base };
1068 kvm_arch_ops->set_gdt(vcpu, &dt);
1071 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1073 struct descriptor_table dt = { limit, base };
1075 kvm_arch_ops->set_idt(vcpu, &dt);
1078 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1079 unsigned long *rflags)
1082 *rflags = kvm_arch_ops->get_rflags(vcpu);
1085 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1087 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1098 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1103 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1104 unsigned long *rflags)
1108 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1109 *rflags = kvm_arch_ops->get_rflags(vcpu);
1118 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1121 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1125 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1130 case 0xc0010010: /* SYSCFG */
1131 case 0xc0010015: /* HWCR */
1132 case MSR_IA32_PLATFORM_ID:
1133 case MSR_IA32_P5_MC_ADDR:
1134 case MSR_IA32_P5_MC_TYPE:
1135 case MSR_IA32_MC0_CTL:
1136 case MSR_IA32_MCG_STATUS:
1137 case MSR_IA32_MCG_CAP:
1138 case MSR_IA32_MC0_MISC:
1139 case MSR_IA32_MC0_MISC+4:
1140 case MSR_IA32_MC0_MISC+8:
1141 case MSR_IA32_MC0_MISC+12:
1142 case MSR_IA32_MC0_MISC+16:
1143 case MSR_IA32_UCODE_REV:
1144 case MSR_IA32_PERF_STATUS:
1145 /* MTRR registers */
1147 case 0x200 ... 0x2ff:
1150 case 0xcd: /* fsb frequency */
1153 case MSR_IA32_APICBASE:
1154 data = vcpu->apic_base;
1156 #ifdef CONFIG_X86_64
1158 data = vcpu->shadow_efer;
1162 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1168 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1171 * Reads an msr value (of 'msr_index') into 'pdata'.
1172 * Returns 0 on success, non-0 otherwise.
1173 * Assumes vcpu_load() was already called.
1175 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1177 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1180 #ifdef CONFIG_X86_64
1182 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1184 if (efer & EFER_RESERVED_BITS) {
1185 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1192 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1193 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1198 kvm_arch_ops->set_efer(vcpu, efer);
1201 efer |= vcpu->shadow_efer & EFER_LMA;
1203 vcpu->shadow_efer = efer;
1208 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1211 #ifdef CONFIG_X86_64
1213 set_efer(vcpu, data);
1216 case MSR_IA32_MC0_STATUS:
1217 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1218 __FUNCTION__, data);
1220 case MSR_IA32_UCODE_REV:
1221 case MSR_IA32_UCODE_WRITE:
1222 case 0x200 ... 0x2ff: /* MTRRs */
1224 case MSR_IA32_APICBASE:
1225 vcpu->apic_base = data;
1228 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1233 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1236 * Writes msr value into into the appropriate "register".
1237 * Returns 0 on success, non-0 otherwise.
1238 * Assumes vcpu_load() was already called.
1240 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1242 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1245 void kvm_resched(struct kvm_vcpu *vcpu)
1249 /* Cannot fail - no vcpu unplug yet. */
1250 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1252 EXPORT_SYMBOL_GPL(kvm_resched);
1254 void load_msrs(struct vmx_msr_entry *e, int n)
1258 for (i = 0; i < n; ++i)
1259 wrmsrl(e[i].index, e[i].data);
1261 EXPORT_SYMBOL_GPL(load_msrs);
1263 void save_msrs(struct vmx_msr_entry *e, int n)
1267 for (i = 0; i < n; ++i)
1268 rdmsrl(e[i].index, e[i].data);
1270 EXPORT_SYMBOL_GPL(save_msrs);
1272 static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1274 struct kvm_vcpu *vcpu;
1277 if (!valid_vcpu(kvm_run->vcpu))
1280 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1284 if (kvm_run->emulated) {
1285 kvm_arch_ops->skip_emulated_instruction(vcpu);
1286 kvm_run->emulated = 0;
1289 if (kvm_run->mmio_completed) {
1290 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1291 vcpu->mmio_read_completed = 1;
1294 vcpu->mmio_needed = 0;
1296 r = kvm_arch_ops->run(vcpu, kvm_run);
1302 static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1304 struct kvm_vcpu *vcpu;
1306 if (!valid_vcpu(regs->vcpu))
1309 vcpu = vcpu_load(kvm, regs->vcpu);
1313 kvm_arch_ops->cache_regs(vcpu);
1315 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1316 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1317 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1318 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1319 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1320 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1321 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1322 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1323 #ifdef CONFIG_X86_64
1324 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1325 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1326 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1327 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1328 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1329 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1330 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1331 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1334 regs->rip = vcpu->rip;
1335 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1338 * Don't leak debug flags in case they were set for guest debugging
1340 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1341 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1348 static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1350 struct kvm_vcpu *vcpu;
1352 if (!valid_vcpu(regs->vcpu))
1355 vcpu = vcpu_load(kvm, regs->vcpu);
1359 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1360 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1361 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1362 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1363 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1364 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1365 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1366 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1367 #ifdef CONFIG_X86_64
1368 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1369 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1370 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1371 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1372 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1373 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1374 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1375 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1378 vcpu->rip = regs->rip;
1379 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1381 kvm_arch_ops->decache_regs(vcpu);
1388 static void get_segment(struct kvm_vcpu *vcpu,
1389 struct kvm_segment *var, int seg)
1391 return kvm_arch_ops->get_segment(vcpu, var, seg);
1394 static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1396 struct kvm_vcpu *vcpu;
1397 struct descriptor_table dt;
1399 if (!valid_vcpu(sregs->vcpu))
1401 vcpu = vcpu_load(kvm, sregs->vcpu);
1405 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1406 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1407 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1408 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1409 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1410 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1412 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1413 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1415 kvm_arch_ops->get_idt(vcpu, &dt);
1416 sregs->idt.limit = dt.limit;
1417 sregs->idt.base = dt.base;
1418 kvm_arch_ops->get_gdt(vcpu, &dt);
1419 sregs->gdt.limit = dt.limit;
1420 sregs->gdt.base = dt.base;
1422 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1423 sregs->cr0 = vcpu->cr0;
1424 sregs->cr2 = vcpu->cr2;
1425 sregs->cr3 = vcpu->cr3;
1426 sregs->cr4 = vcpu->cr4;
1427 sregs->cr8 = vcpu->cr8;
1428 sregs->efer = vcpu->shadow_efer;
1429 sregs->apic_base = vcpu->apic_base;
1431 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1432 sizeof sregs->interrupt_bitmap);
1439 static void set_segment(struct kvm_vcpu *vcpu,
1440 struct kvm_segment *var, int seg)
1442 return kvm_arch_ops->set_segment(vcpu, var, seg);
1445 static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1447 struct kvm_vcpu *vcpu;
1448 int mmu_reset_needed = 0;
1450 struct descriptor_table dt;
1452 if (!valid_vcpu(sregs->vcpu))
1454 vcpu = vcpu_load(kvm, sregs->vcpu);
1458 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1459 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1460 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1461 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1462 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1463 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1465 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1466 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1468 dt.limit = sregs->idt.limit;
1469 dt.base = sregs->idt.base;
1470 kvm_arch_ops->set_idt(vcpu, &dt);
1471 dt.limit = sregs->gdt.limit;
1472 dt.base = sregs->gdt.base;
1473 kvm_arch_ops->set_gdt(vcpu, &dt);
1475 vcpu->cr2 = sregs->cr2;
1476 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1477 vcpu->cr3 = sregs->cr3;
1479 vcpu->cr8 = sregs->cr8;
1481 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1482 #ifdef CONFIG_X86_64
1483 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1485 vcpu->apic_base = sregs->apic_base;
1487 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1489 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1490 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1492 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1493 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1495 if (mmu_reset_needed)
1496 kvm_mmu_reset_context(vcpu);
1498 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1499 sizeof vcpu->irq_pending);
1500 vcpu->irq_summary = 0;
1501 for (i = 0; i < NR_IRQ_WORDS; ++i)
1502 if (vcpu->irq_pending[i])
1503 __set_bit(i, &vcpu->irq_summary);
1511 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1512 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1514 * This list is modified at module load time to reflect the
1515 * capabilities of the host cpu.
1517 static u32 msrs_to_save[] = {
1518 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1520 #ifdef CONFIG_X86_64
1521 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1523 MSR_IA32_TIME_STAMP_COUNTER,
1526 static unsigned num_msrs_to_save;
1528 static __init void kvm_init_msr_list(void)
1533 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1534 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1537 msrs_to_save[j] = msrs_to_save[i];
1540 num_msrs_to_save = j;
1544 * Adapt set_msr() to msr_io()'s calling convention
1546 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1548 return set_msr(vcpu, index, *data);
1552 * Read or write a bunch of msrs. All parameters are kernel addresses.
1554 * @return number of msrs set successfully.
1556 static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1557 struct kvm_msr_entry *entries,
1558 int (*do_msr)(struct kvm_vcpu *vcpu,
1559 unsigned index, u64 *data))
1561 struct kvm_vcpu *vcpu;
1564 if (!valid_vcpu(msrs->vcpu))
1567 vcpu = vcpu_load(kvm, msrs->vcpu);
1571 for (i = 0; i < msrs->nmsrs; ++i)
1572 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1581 * Read or write a bunch of msrs. Parameters are user addresses.
1583 * @return number of msrs set successfully.
1585 static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1586 int (*do_msr)(struct kvm_vcpu *vcpu,
1587 unsigned index, u64 *data),
1590 struct kvm_msrs msrs;
1591 struct kvm_msr_entry *entries;
1596 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1600 if (msrs.nmsrs >= MAX_IO_MSRS)
1604 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1605 entries = vmalloc(size);
1610 if (copy_from_user(entries, user_msrs->entries, size))
1613 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1618 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1630 * Translate a guest virtual address to a guest physical address.
1632 static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1634 unsigned long vaddr = tr->linear_address;
1635 struct kvm_vcpu *vcpu;
1638 vcpu = vcpu_load(kvm, tr->vcpu);
1641 spin_lock(&kvm->lock);
1642 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1643 tr->physical_address = gpa;
1644 tr->valid = gpa != UNMAPPED_GVA;
1647 spin_unlock(&kvm->lock);
1653 static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1655 struct kvm_vcpu *vcpu;
1657 if (!valid_vcpu(irq->vcpu))
1659 if (irq->irq < 0 || irq->irq >= 256)
1661 vcpu = vcpu_load(kvm, irq->vcpu);
1665 set_bit(irq->irq, vcpu->irq_pending);
1666 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1673 static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1674 struct kvm_debug_guest *dbg)
1676 struct kvm_vcpu *vcpu;
1679 if (!valid_vcpu(dbg->vcpu))
1681 vcpu = vcpu_load(kvm, dbg->vcpu);
1685 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1692 static long kvm_dev_ioctl(struct file *filp,
1693 unsigned int ioctl, unsigned long arg)
1695 struct kvm *kvm = filp->private_data;
1699 case KVM_GET_API_VERSION:
1700 r = KVM_API_VERSION;
1702 case KVM_CREATE_VCPU: {
1703 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1709 struct kvm_run kvm_run;
1712 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1714 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1715 if (r < 0 && r != -EINTR)
1717 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) {
1723 case KVM_GET_REGS: {
1724 struct kvm_regs kvm_regs;
1727 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1729 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1733 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1738 case KVM_SET_REGS: {
1739 struct kvm_regs kvm_regs;
1742 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1744 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1750 case KVM_GET_SREGS: {
1751 struct kvm_sregs kvm_sregs;
1754 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1756 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1760 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1765 case KVM_SET_SREGS: {
1766 struct kvm_sregs kvm_sregs;
1769 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1771 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1777 case KVM_TRANSLATE: {
1778 struct kvm_translation tr;
1781 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1783 r = kvm_dev_ioctl_translate(kvm, &tr);
1787 if (copy_to_user((void *)arg, &tr, sizeof tr))
1792 case KVM_INTERRUPT: {
1793 struct kvm_interrupt irq;
1796 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1798 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1804 case KVM_DEBUG_GUEST: {
1805 struct kvm_debug_guest dbg;
1808 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1810 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1816 case KVM_SET_MEMORY_REGION: {
1817 struct kvm_memory_region kvm_mem;
1820 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1822 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1827 case KVM_GET_DIRTY_LOG: {
1828 struct kvm_dirty_log log;
1831 if (copy_from_user(&log, (void *)arg, sizeof log))
1833 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1839 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1842 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1844 case KVM_GET_MSR_INDEX_LIST: {
1845 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1846 struct kvm_msr_list msr_list;
1850 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1853 msr_list.nmsrs = num_msrs_to_save;
1854 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1857 if (n < num_msrs_to_save)
1860 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1861 num_msrs_to_save * sizeof(u32)))
1872 static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1873 unsigned long address,
1876 struct kvm *kvm = vma->vm_file->private_data;
1877 unsigned long pgoff;
1878 struct kvm_memory_slot *slot;
1881 *type = VM_FAULT_MINOR;
1882 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1883 slot = gfn_to_memslot(kvm, pgoff);
1885 return NOPAGE_SIGBUS;
1886 page = gfn_to_page(slot, pgoff);
1888 return NOPAGE_SIGBUS;
1893 static struct vm_operations_struct kvm_dev_vm_ops = {
1894 .nopage = kvm_dev_nopage,
1897 static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1899 vma->vm_ops = &kvm_dev_vm_ops;
1903 static struct file_operations kvm_chardev_ops = {
1904 .open = kvm_dev_open,
1905 .release = kvm_dev_release,
1906 .unlocked_ioctl = kvm_dev_ioctl,
1907 .compat_ioctl = kvm_dev_ioctl,
1908 .mmap = kvm_dev_mmap,
1911 static struct miscdevice kvm_dev = {
1917 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1920 if (val == SYS_RESTART) {
1922 * Some (well, at least mine) BIOSes hang on reboot if
1925 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1926 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1931 static struct notifier_block kvm_reboot_notifier = {
1932 .notifier_call = kvm_reboot,
1936 static __init void kvm_init_debug(void)
1938 struct kvm_stats_debugfs_item *p;
1940 debugfs_dir = debugfs_create_dir("kvm", 0);
1941 for (p = debugfs_entries; p->name; ++p)
1942 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
1946 static void kvm_exit_debug(void)
1948 struct kvm_stats_debugfs_item *p;
1950 for (p = debugfs_entries; p->name; ++p)
1951 debugfs_remove(p->dentry);
1952 debugfs_remove(debugfs_dir);
1955 hpa_t bad_page_address;
1957 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
1962 printk(KERN_ERR "kvm: already loaded the other module\n");
1966 if (!ops->cpu_has_kvm_support()) {
1967 printk(KERN_ERR "kvm: no hardware support\n");
1970 if (ops->disabled_by_bios()) {
1971 printk(KERN_ERR "kvm: disabled by bios\n");
1977 r = kvm_arch_ops->hardware_setup();
1981 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
1982 register_reboot_notifier(&kvm_reboot_notifier);
1984 kvm_chardev_ops.owner = module;
1986 r = misc_register(&kvm_dev);
1988 printk (KERN_ERR "kvm: misc device register failed\n");
1995 unregister_reboot_notifier(&kvm_reboot_notifier);
1996 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1997 kvm_arch_ops->hardware_unsetup();
2001 void kvm_exit_arch(void)
2003 misc_deregister(&kvm_dev);
2005 unregister_reboot_notifier(&kvm_reboot_notifier);
2006 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2007 kvm_arch_ops->hardware_unsetup();
2008 kvm_arch_ops = NULL;
2011 static __init int kvm_init(void)
2013 static struct page *bad_page;
2018 kvm_init_msr_list();
2020 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2025 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2026 memset(__va(bad_page_address), 0, PAGE_SIZE);
2035 static __exit void kvm_exit(void)
2038 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2041 module_init(kvm_init)
2042 module_exit(kvm_exit)
2044 EXPORT_SYMBOL_GPL(kvm_init_arch);
2045 EXPORT_SYMBOL_GPL(kvm_exit_arch);