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);
301 static int pdptrs_have_reserved_bits_set(struct kvm_vcpu *vcpu,
304 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
305 unsigned offset = (cr3 & (PAGE_SIZE-1)) >> 5;
309 struct kvm_memory_slot *memslot;
311 spin_lock(&vcpu->kvm->lock);
312 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
313 /* FIXME: !memslot - emulate? 0xff? */
314 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
316 for (i = 0; i < 4; ++i) {
317 pdpte = pdpt[offset + i];
318 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull))
322 kunmap_atomic(pdpt, KM_USER0);
323 spin_unlock(&vcpu->kvm->lock);
328 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
330 if (cr0 & CR0_RESEVED_BITS) {
331 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
337 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
338 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
343 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
344 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
345 "and a clear PE flag\n");
350 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
352 if ((vcpu->shadow_efer & EFER_LME)) {
356 printk(KERN_DEBUG "set_cr0: #GP, start paging "
357 "in long mode while PAE is disabled\n");
361 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
363 printk(KERN_DEBUG "set_cr0: #GP, start paging "
364 "in long mode while CS.L == 1\n");
372 pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
373 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
381 kvm_arch_ops->set_cr0(vcpu, cr0);
384 spin_lock(&vcpu->kvm->lock);
385 kvm_mmu_reset_context(vcpu);
386 spin_unlock(&vcpu->kvm->lock);
389 EXPORT_SYMBOL_GPL(set_cr0);
391 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
393 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
395 EXPORT_SYMBOL_GPL(lmsw);
397 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
399 if (cr4 & CR4_RESEVED_BITS) {
400 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
405 if (is_long_mode(vcpu)) {
406 if (!(cr4 & CR4_PAE_MASK)) {
407 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
412 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
413 && pdptrs_have_reserved_bits_set(vcpu, vcpu->cr3)) {
414 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
418 if (cr4 & CR4_VMXE_MASK) {
419 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
423 kvm_arch_ops->set_cr4(vcpu, cr4);
424 spin_lock(&vcpu->kvm->lock);
425 kvm_mmu_reset_context(vcpu);
426 spin_unlock(&vcpu->kvm->lock);
428 EXPORT_SYMBOL_GPL(set_cr4);
430 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
432 if (is_long_mode(vcpu)) {
433 if ( cr3 & CR3_L_MODE_RESEVED_BITS) {
434 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
439 if (cr3 & CR3_RESEVED_BITS) {
440 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
444 if (is_paging(vcpu) && is_pae(vcpu) &&
445 pdptrs_have_reserved_bits_set(vcpu, cr3)) {
446 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
454 spin_lock(&vcpu->kvm->lock);
455 vcpu->mmu.new_cr3(vcpu);
456 spin_unlock(&vcpu->kvm->lock);
458 EXPORT_SYMBOL_GPL(set_cr3);
460 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
462 if ( cr8 & CR8_RESEVED_BITS) {
463 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
469 EXPORT_SYMBOL_GPL(set_cr8);
471 void fx_init(struct kvm_vcpu *vcpu)
473 struct __attribute__ ((__packed__)) fx_image_s {
479 u64 operand;// fpu dp
485 fx_save(vcpu->host_fx_image);
487 fx_save(vcpu->guest_fx_image);
488 fx_restore(vcpu->host_fx_image);
490 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
491 fx_image->mxcsr = 0x1f80;
492 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
493 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
495 EXPORT_SYMBOL_GPL(fx_init);
498 * Creates some virtual cpus. Good luck creating more than one.
500 static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
503 struct kvm_vcpu *vcpu;
509 vcpu = &kvm->vcpus[n];
511 mutex_lock(&vcpu->mutex);
514 mutex_unlock(&vcpu->mutex);
518 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
520 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
522 vcpu->cpu = -1; /* First load will set up TR */
524 r = kvm_arch_ops->vcpu_create(vcpu);
528 r = kvm_mmu_create(vcpu);
532 kvm_arch_ops->vcpu_load(vcpu);
533 r = kvm_mmu_setup(vcpu);
535 r = kvm_arch_ops->vcpu_setup(vcpu);
545 mutex_unlock(&vcpu->mutex);
551 * Allocate some memory and give it an address in the guest physical address
554 * Discontiguous memory is allowed, mostly for framebuffers.
556 static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
557 struct kvm_memory_region *mem)
561 unsigned long npages;
563 struct kvm_memory_slot *memslot;
564 struct kvm_memory_slot old, new;
565 int memory_config_version;
568 /* General sanity checks */
569 if (mem->memory_size & (PAGE_SIZE - 1))
571 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
573 if (mem->slot >= KVM_MEMORY_SLOTS)
575 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
578 memslot = &kvm->memslots[mem->slot];
579 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
580 npages = mem->memory_size >> PAGE_SHIFT;
583 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
586 spin_lock(&kvm->lock);
588 memory_config_version = kvm->memory_config_version;
589 new = old = *memslot;
591 new.base_gfn = base_gfn;
593 new.flags = mem->flags;
595 /* Disallow changing a memory slot's size. */
597 if (npages && old.npages && npages != old.npages)
600 /* Check for overlaps */
602 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
603 struct kvm_memory_slot *s = &kvm->memslots[i];
607 if (!((base_gfn + npages <= s->base_gfn) ||
608 (base_gfn >= s->base_gfn + s->npages)))
612 * Do memory allocations outside lock. memory_config_version will
615 spin_unlock(&kvm->lock);
617 /* Deallocate if slot is being removed */
621 /* Free page dirty bitmap if unneeded */
622 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
623 new.dirty_bitmap = 0;
627 /* Allocate if a slot is being created */
628 if (npages && !new.phys_mem) {
629 new.phys_mem = vmalloc(npages * sizeof(struct page *));
634 memset(new.phys_mem, 0, npages * sizeof(struct page *));
635 for (i = 0; i < npages; ++i) {
636 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
638 if (!new.phys_mem[i])
643 /* Allocate page dirty bitmap if needed */
644 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
645 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
647 new.dirty_bitmap = vmalloc(dirty_bytes);
648 if (!new.dirty_bitmap)
650 memset(new.dirty_bitmap, 0, dirty_bytes);
653 spin_lock(&kvm->lock);
655 if (memory_config_version != kvm->memory_config_version) {
656 spin_unlock(&kvm->lock);
657 kvm_free_physmem_slot(&new, &old);
665 if (mem->slot >= kvm->nmemslots)
666 kvm->nmemslots = mem->slot + 1;
669 ++kvm->memory_config_version;
671 spin_unlock(&kvm->lock);
673 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
674 struct kvm_vcpu *vcpu;
676 vcpu = vcpu_load(kvm, i);
679 kvm_mmu_reset_context(vcpu);
683 kvm_free_physmem_slot(&old, &new);
687 spin_unlock(&kvm->lock);
689 kvm_free_physmem_slot(&new, &old);
695 * Get (and clear) the dirty memory log for a memory slot.
697 static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
698 struct kvm_dirty_log *log)
700 struct kvm_memory_slot *memslot;
703 unsigned long any = 0;
705 spin_lock(&kvm->lock);
708 * Prevent changes to guest memory configuration even while the lock
712 spin_unlock(&kvm->lock);
714 if (log->slot >= KVM_MEMORY_SLOTS)
717 memslot = &kvm->memslots[log->slot];
719 if (!memslot->dirty_bitmap)
722 n = ALIGN(memslot->npages, 8) / 8;
724 for (i = 0; !any && i < n; ++i)
725 any = memslot->dirty_bitmap[i];
728 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
733 spin_lock(&kvm->lock);
734 kvm_mmu_slot_remove_write_access(kvm, log->slot);
735 spin_unlock(&kvm->lock);
736 memset(memslot->dirty_bitmap, 0, n);
737 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
738 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
742 kvm_arch_ops->tlb_flush(vcpu);
750 spin_lock(&kvm->lock);
752 spin_unlock(&kvm->lock);
756 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
760 for (i = 0; i < kvm->nmemslots; ++i) {
761 struct kvm_memory_slot *memslot = &kvm->memslots[i];
763 if (gfn >= memslot->base_gfn
764 && gfn < memslot->base_gfn + memslot->npages)
769 EXPORT_SYMBOL_GPL(gfn_to_memslot);
771 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
774 struct kvm_memory_slot *memslot = 0;
775 unsigned long rel_gfn;
777 for (i = 0; i < kvm->nmemslots; ++i) {
778 memslot = &kvm->memslots[i];
780 if (gfn >= memslot->base_gfn
781 && gfn < memslot->base_gfn + memslot->npages) {
783 if (!memslot || !memslot->dirty_bitmap)
786 rel_gfn = gfn - memslot->base_gfn;
789 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
790 set_bit(rel_gfn, memslot->dirty_bitmap);
796 static int emulator_read_std(unsigned long addr,
799 struct x86_emulate_ctxt *ctxt)
801 struct kvm_vcpu *vcpu = ctxt->vcpu;
805 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
806 unsigned offset = addr & (PAGE_SIZE-1);
807 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
809 struct kvm_memory_slot *memslot;
812 if (gpa == UNMAPPED_GVA)
813 return X86EMUL_PROPAGATE_FAULT;
814 pfn = gpa >> PAGE_SHIFT;
815 memslot = gfn_to_memslot(vcpu->kvm, pfn);
817 return X86EMUL_UNHANDLEABLE;
818 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
820 memcpy(data, page + offset, tocopy);
822 kunmap_atomic(page, KM_USER0);
829 return X86EMUL_CONTINUE;
832 static int emulator_write_std(unsigned long addr,
835 struct x86_emulate_ctxt *ctxt)
837 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
839 return X86EMUL_UNHANDLEABLE;
842 static int emulator_read_emulated(unsigned long addr,
845 struct x86_emulate_ctxt *ctxt)
847 struct kvm_vcpu *vcpu = ctxt->vcpu;
849 if (vcpu->mmio_read_completed) {
850 memcpy(val, vcpu->mmio_data, bytes);
851 vcpu->mmio_read_completed = 0;
852 return X86EMUL_CONTINUE;
853 } else if (emulator_read_std(addr, val, bytes, ctxt)
855 return X86EMUL_CONTINUE;
857 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
858 if (gpa == UNMAPPED_GVA)
859 return vcpu_printf(vcpu, "not present\n"), X86EMUL_PROPAGATE_FAULT;
860 vcpu->mmio_needed = 1;
861 vcpu->mmio_phys_addr = gpa;
862 vcpu->mmio_size = bytes;
863 vcpu->mmio_is_write = 0;
865 return X86EMUL_UNHANDLEABLE;
869 static int emulator_write_emulated(unsigned long addr,
872 struct x86_emulate_ctxt *ctxt)
874 struct kvm_vcpu *vcpu = ctxt->vcpu;
875 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
877 if (gpa == UNMAPPED_GVA)
878 return X86EMUL_PROPAGATE_FAULT;
880 vcpu->mmio_needed = 1;
881 vcpu->mmio_phys_addr = gpa;
882 vcpu->mmio_size = bytes;
883 vcpu->mmio_is_write = 1;
884 memcpy(vcpu->mmio_data, &val, bytes);
886 return X86EMUL_CONTINUE;
889 static int emulator_cmpxchg_emulated(unsigned long addr,
893 struct x86_emulate_ctxt *ctxt)
899 printk(KERN_WARNING "kvm: emulating exchange as write\n");
901 return emulator_write_emulated(addr, new, bytes, ctxt);
904 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
906 return kvm_arch_ops->get_segment_base(vcpu, seg);
909 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
911 spin_lock(&vcpu->kvm->lock);
912 vcpu->mmu.inval_page(vcpu, address);
913 spin_unlock(&vcpu->kvm->lock);
914 kvm_arch_ops->invlpg(vcpu, address);
915 return X86EMUL_CONTINUE;
918 int emulate_clts(struct kvm_vcpu *vcpu)
920 unsigned long cr0 = vcpu->cr0;
923 kvm_arch_ops->set_cr0(vcpu, cr0);
924 return X86EMUL_CONTINUE;
927 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
929 struct kvm_vcpu *vcpu = ctxt->vcpu;
933 *dest = kvm_arch_ops->get_dr(vcpu, dr);
934 return X86EMUL_CONTINUE;
936 printk(KERN_DEBUG "%s: unexpected dr %u\n",
938 return X86EMUL_UNHANDLEABLE;
942 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
944 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
947 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
949 /* FIXME: better handling */
950 return X86EMUL_UNHANDLEABLE;
952 return X86EMUL_CONTINUE;
955 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
959 unsigned long rip = ctxt->vcpu->rip;
960 unsigned long rip_linear;
962 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
967 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
969 printk(KERN_ERR "emulation failed but !mmio_needed?"
970 " rip %lx %02x %02x %02x %02x\n",
971 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
975 struct x86_emulate_ops emulate_ops = {
976 .read_std = emulator_read_std,
977 .write_std = emulator_write_std,
978 .read_emulated = emulator_read_emulated,
979 .write_emulated = emulator_write_emulated,
980 .cmpxchg_emulated = emulator_cmpxchg_emulated,
983 int emulate_instruction(struct kvm_vcpu *vcpu,
988 struct x86_emulate_ctxt emulate_ctxt;
992 kvm_arch_ops->cache_regs(vcpu);
994 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
996 emulate_ctxt.vcpu = vcpu;
997 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
998 emulate_ctxt.cr2 = cr2;
999 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1000 ? X86EMUL_MODE_REAL : cs_l
1001 ? X86EMUL_MODE_PROT64 : cs_db
1002 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1004 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1005 emulate_ctxt.cs_base = 0;
1006 emulate_ctxt.ds_base = 0;
1007 emulate_ctxt.es_base = 0;
1008 emulate_ctxt.ss_base = 0;
1010 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1011 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1012 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1013 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1016 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1017 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1019 vcpu->mmio_is_write = 0;
1020 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1022 if ((r || vcpu->mmio_is_write) && run) {
1023 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1024 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1025 run->mmio.len = vcpu->mmio_size;
1026 run->mmio.is_write = vcpu->mmio_is_write;
1030 if (!vcpu->mmio_needed) {
1031 report_emulation_failure(&emulate_ctxt);
1032 return EMULATE_FAIL;
1034 return EMULATE_DO_MMIO;
1037 kvm_arch_ops->decache_regs(vcpu);
1038 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1040 if (vcpu->mmio_is_write)
1041 return EMULATE_DO_MMIO;
1043 return EMULATE_DONE;
1045 EXPORT_SYMBOL_GPL(emulate_instruction);
1047 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1049 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1052 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1054 struct descriptor_table dt = { limit, base };
1056 kvm_arch_ops->set_gdt(vcpu, &dt);
1059 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1061 struct descriptor_table dt = { limit, base };
1063 kvm_arch_ops->set_idt(vcpu, &dt);
1066 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1067 unsigned long *rflags)
1070 *rflags = kvm_arch_ops->get_rflags(vcpu);
1073 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1085 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1090 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1091 unsigned long *rflags)
1095 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1096 *rflags = kvm_arch_ops->get_rflags(vcpu);
1105 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1108 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1112 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1117 case 0xc0010010: /* SYSCFG */
1118 case 0xc0010015: /* HWCR */
1119 case MSR_IA32_PLATFORM_ID:
1120 case MSR_IA32_P5_MC_ADDR:
1121 case MSR_IA32_P5_MC_TYPE:
1122 case MSR_IA32_MC0_CTL:
1123 case MSR_IA32_MCG_STATUS:
1124 case MSR_IA32_MCG_CAP:
1125 case MSR_IA32_MC0_MISC:
1126 case MSR_IA32_MC0_MISC+4:
1127 case MSR_IA32_MC0_MISC+8:
1128 case MSR_IA32_MC0_MISC+12:
1129 case MSR_IA32_MC0_MISC+16:
1130 case MSR_IA32_UCODE_REV:
1131 case MSR_IA32_PERF_STATUS:
1132 /* MTRR registers */
1134 case 0x200 ... 0x2ff:
1137 case 0xcd: /* fsb frequency */
1140 case MSR_IA32_APICBASE:
1141 data = vcpu->apic_base;
1143 #ifdef CONFIG_X86_64
1145 data = vcpu->shadow_efer;
1149 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1155 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1158 * Reads an msr value (of 'msr_index') into 'pdata'.
1159 * Returns 0 on success, non-0 otherwise.
1160 * Assumes vcpu_load() was already called.
1162 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1164 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1167 #ifdef CONFIG_X86_64
1169 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1171 if (efer & EFER_RESERVED_BITS) {
1172 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1179 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1180 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1185 kvm_arch_ops->set_efer(vcpu, efer);
1188 efer |= vcpu->shadow_efer & EFER_LMA;
1190 vcpu->shadow_efer = efer;
1195 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1198 #ifdef CONFIG_X86_64
1200 set_efer(vcpu, data);
1203 case MSR_IA32_MC0_STATUS:
1204 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1205 __FUNCTION__, data);
1207 case MSR_IA32_UCODE_REV:
1208 case MSR_IA32_UCODE_WRITE:
1209 case 0x200 ... 0x2ff: /* MTRRs */
1211 case MSR_IA32_APICBASE:
1212 vcpu->apic_base = data;
1215 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1220 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1223 * Writes msr value into into the appropriate "register".
1224 * Returns 0 on success, non-0 otherwise.
1225 * Assumes vcpu_load() was already called.
1227 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1229 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1232 void kvm_resched(struct kvm_vcpu *vcpu)
1236 /* Cannot fail - no vcpu unplug yet. */
1237 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1239 EXPORT_SYMBOL_GPL(kvm_resched);
1241 void load_msrs(struct vmx_msr_entry *e, int n)
1245 for (i = 0; i < n; ++i)
1246 wrmsrl(e[i].index, e[i].data);
1248 EXPORT_SYMBOL_GPL(load_msrs);
1250 void save_msrs(struct vmx_msr_entry *e, int n)
1254 for (i = 0; i < n; ++i)
1255 rdmsrl(e[i].index, e[i].data);
1257 EXPORT_SYMBOL_GPL(save_msrs);
1259 static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1261 struct kvm_vcpu *vcpu;
1264 if (!valid_vcpu(kvm_run->vcpu))
1267 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1271 if (kvm_run->emulated) {
1272 kvm_arch_ops->skip_emulated_instruction(vcpu);
1273 kvm_run->emulated = 0;
1276 if (kvm_run->mmio_completed) {
1277 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1278 vcpu->mmio_read_completed = 1;
1281 vcpu->mmio_needed = 0;
1283 r = kvm_arch_ops->run(vcpu, kvm_run);
1289 static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1291 struct kvm_vcpu *vcpu;
1293 if (!valid_vcpu(regs->vcpu))
1296 vcpu = vcpu_load(kvm, regs->vcpu);
1300 kvm_arch_ops->cache_regs(vcpu);
1302 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1303 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1304 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1305 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1306 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1307 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1308 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1309 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1310 #ifdef CONFIG_X86_64
1311 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1312 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1313 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1314 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1315 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1316 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1317 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1318 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1321 regs->rip = vcpu->rip;
1322 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1325 * Don't leak debug flags in case they were set for guest debugging
1327 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1328 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1335 static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1337 struct kvm_vcpu *vcpu;
1339 if (!valid_vcpu(regs->vcpu))
1342 vcpu = vcpu_load(kvm, regs->vcpu);
1346 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1347 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1348 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1349 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1350 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1351 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1352 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1353 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1354 #ifdef CONFIG_X86_64
1355 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1356 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1357 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1358 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1359 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1360 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1361 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1362 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1365 vcpu->rip = regs->rip;
1366 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1368 kvm_arch_ops->decache_regs(vcpu);
1375 static void get_segment(struct kvm_vcpu *vcpu,
1376 struct kvm_segment *var, int seg)
1378 return kvm_arch_ops->get_segment(vcpu, var, seg);
1381 static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1383 struct kvm_vcpu *vcpu;
1384 struct descriptor_table dt;
1386 if (!valid_vcpu(sregs->vcpu))
1388 vcpu = vcpu_load(kvm, sregs->vcpu);
1392 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1393 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1394 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1395 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1396 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1397 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1399 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1400 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1402 kvm_arch_ops->get_idt(vcpu, &dt);
1403 sregs->idt.limit = dt.limit;
1404 sregs->idt.base = dt.base;
1405 kvm_arch_ops->get_gdt(vcpu, &dt);
1406 sregs->gdt.limit = dt.limit;
1407 sregs->gdt.base = dt.base;
1409 sregs->cr0 = vcpu->cr0;
1410 sregs->cr2 = vcpu->cr2;
1411 sregs->cr3 = vcpu->cr3;
1412 sregs->cr4 = vcpu->cr4;
1413 sregs->cr8 = vcpu->cr8;
1414 sregs->efer = vcpu->shadow_efer;
1415 sregs->apic_base = vcpu->apic_base;
1417 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1418 sizeof sregs->interrupt_bitmap);
1425 static void set_segment(struct kvm_vcpu *vcpu,
1426 struct kvm_segment *var, int seg)
1428 return kvm_arch_ops->set_segment(vcpu, var, seg);
1431 static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1433 struct kvm_vcpu *vcpu;
1434 int mmu_reset_needed = 0;
1436 struct descriptor_table dt;
1438 if (!valid_vcpu(sregs->vcpu))
1440 vcpu = vcpu_load(kvm, sregs->vcpu);
1444 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1445 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1446 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1447 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1448 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1449 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1451 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1452 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1454 dt.limit = sregs->idt.limit;
1455 dt.base = sregs->idt.base;
1456 kvm_arch_ops->set_idt(vcpu, &dt);
1457 dt.limit = sregs->gdt.limit;
1458 dt.base = sregs->gdt.base;
1459 kvm_arch_ops->set_gdt(vcpu, &dt);
1461 vcpu->cr2 = sregs->cr2;
1462 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1463 vcpu->cr3 = sregs->cr3;
1465 vcpu->cr8 = sregs->cr8;
1467 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1468 #ifdef CONFIG_X86_64
1469 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1471 vcpu->apic_base = sregs->apic_base;
1473 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1474 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1476 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1477 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1479 if (mmu_reset_needed)
1480 kvm_mmu_reset_context(vcpu);
1482 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1483 sizeof vcpu->irq_pending);
1484 vcpu->irq_summary = 0;
1485 for (i = 0; i < NR_IRQ_WORDS; ++i)
1486 if (vcpu->irq_pending[i])
1487 __set_bit(i, &vcpu->irq_summary);
1495 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1496 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1498 * This list is modified at module load time to reflect the
1499 * capabilities of the host cpu.
1501 static u32 msrs_to_save[] = {
1502 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1504 #ifdef CONFIG_X86_64
1505 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1507 MSR_IA32_TIME_STAMP_COUNTER,
1510 static unsigned num_msrs_to_save;
1512 static __init void kvm_init_msr_list(void)
1517 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1518 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1521 msrs_to_save[j] = msrs_to_save[i];
1524 num_msrs_to_save = j;
1528 * Adapt set_msr() to msr_io()'s calling convention
1530 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1532 return set_msr(vcpu, index, *data);
1536 * Read or write a bunch of msrs. All parameters are kernel addresses.
1538 * @return number of msrs set successfully.
1540 static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1541 struct kvm_msr_entry *entries,
1542 int (*do_msr)(struct kvm_vcpu *vcpu,
1543 unsigned index, u64 *data))
1545 struct kvm_vcpu *vcpu;
1548 if (!valid_vcpu(msrs->vcpu))
1551 vcpu = vcpu_load(kvm, msrs->vcpu);
1555 for (i = 0; i < msrs->nmsrs; ++i)
1556 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1565 * Read or write a bunch of msrs. Parameters are user addresses.
1567 * @return number of msrs set successfully.
1569 static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1570 int (*do_msr)(struct kvm_vcpu *vcpu,
1571 unsigned index, u64 *data),
1574 struct kvm_msrs msrs;
1575 struct kvm_msr_entry *entries;
1580 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1584 if (msrs.nmsrs >= MAX_IO_MSRS)
1588 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1589 entries = vmalloc(size);
1594 if (copy_from_user(entries, user_msrs->entries, size))
1597 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1602 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1614 * Translate a guest virtual address to a guest physical address.
1616 static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1618 unsigned long vaddr = tr->linear_address;
1619 struct kvm_vcpu *vcpu;
1622 vcpu = vcpu_load(kvm, tr->vcpu);
1625 spin_lock(&kvm->lock);
1626 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1627 tr->physical_address = gpa;
1628 tr->valid = gpa != UNMAPPED_GVA;
1631 spin_unlock(&kvm->lock);
1637 static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1639 struct kvm_vcpu *vcpu;
1641 if (!valid_vcpu(irq->vcpu))
1643 if (irq->irq < 0 || irq->irq >= 256)
1645 vcpu = vcpu_load(kvm, irq->vcpu);
1649 set_bit(irq->irq, vcpu->irq_pending);
1650 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1657 static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1658 struct kvm_debug_guest *dbg)
1660 struct kvm_vcpu *vcpu;
1663 if (!valid_vcpu(dbg->vcpu))
1665 vcpu = vcpu_load(kvm, dbg->vcpu);
1669 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1676 static long kvm_dev_ioctl(struct file *filp,
1677 unsigned int ioctl, unsigned long arg)
1679 struct kvm *kvm = filp->private_data;
1683 case KVM_GET_API_VERSION:
1684 r = KVM_API_VERSION;
1686 case KVM_CREATE_VCPU: {
1687 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1693 struct kvm_run kvm_run;
1696 if (copy_from_user(&kvm_run, (void *)arg, sizeof kvm_run))
1698 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1699 if (r < 0 && r != -EINTR)
1701 if (copy_to_user((void *)arg, &kvm_run, sizeof kvm_run)) {
1707 case KVM_GET_REGS: {
1708 struct kvm_regs kvm_regs;
1711 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1713 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1717 if (copy_to_user((void *)arg, &kvm_regs, sizeof kvm_regs))
1722 case KVM_SET_REGS: {
1723 struct kvm_regs kvm_regs;
1726 if (copy_from_user(&kvm_regs, (void *)arg, sizeof kvm_regs))
1728 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1734 case KVM_GET_SREGS: {
1735 struct kvm_sregs kvm_sregs;
1738 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1740 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1744 if (copy_to_user((void *)arg, &kvm_sregs, sizeof kvm_sregs))
1749 case KVM_SET_SREGS: {
1750 struct kvm_sregs kvm_sregs;
1753 if (copy_from_user(&kvm_sregs, (void *)arg, sizeof kvm_sregs))
1755 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1761 case KVM_TRANSLATE: {
1762 struct kvm_translation tr;
1765 if (copy_from_user(&tr, (void *)arg, sizeof tr))
1767 r = kvm_dev_ioctl_translate(kvm, &tr);
1771 if (copy_to_user((void *)arg, &tr, sizeof tr))
1776 case KVM_INTERRUPT: {
1777 struct kvm_interrupt irq;
1780 if (copy_from_user(&irq, (void *)arg, sizeof irq))
1782 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1788 case KVM_DEBUG_GUEST: {
1789 struct kvm_debug_guest dbg;
1792 if (copy_from_user(&dbg, (void *)arg, sizeof dbg))
1794 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1800 case KVM_SET_MEMORY_REGION: {
1801 struct kvm_memory_region kvm_mem;
1804 if (copy_from_user(&kvm_mem, (void *)arg, sizeof kvm_mem))
1806 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1811 case KVM_GET_DIRTY_LOG: {
1812 struct kvm_dirty_log log;
1815 if (copy_from_user(&log, (void *)arg, sizeof log))
1817 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1823 r = msr_io(kvm, (void __user *)arg, get_msr, 1);
1826 r = msr_io(kvm, (void __user *)arg, do_set_msr, 0);
1828 case KVM_GET_MSR_INDEX_LIST: {
1829 struct kvm_msr_list __user *user_msr_list = (void __user *)arg;
1830 struct kvm_msr_list msr_list;
1834 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1837 msr_list.nmsrs = num_msrs_to_save;
1838 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1841 if (n < num_msrs_to_save)
1844 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1845 num_msrs_to_save * sizeof(u32)))
1856 static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1857 unsigned long address,
1860 struct kvm *kvm = vma->vm_file->private_data;
1861 unsigned long pgoff;
1862 struct kvm_memory_slot *slot;
1865 *type = VM_FAULT_MINOR;
1866 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1867 slot = gfn_to_memslot(kvm, pgoff);
1869 return NOPAGE_SIGBUS;
1870 page = gfn_to_page(slot, pgoff);
1872 return NOPAGE_SIGBUS;
1877 static struct vm_operations_struct kvm_dev_vm_ops = {
1878 .nopage = kvm_dev_nopage,
1881 static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
1883 vma->vm_ops = &kvm_dev_vm_ops;
1887 static struct file_operations kvm_chardev_ops = {
1888 .open = kvm_dev_open,
1889 .release = kvm_dev_release,
1890 .unlocked_ioctl = kvm_dev_ioctl,
1891 .compat_ioctl = kvm_dev_ioctl,
1892 .mmap = kvm_dev_mmap,
1895 static struct miscdevice kvm_dev = {
1901 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1904 if (val == SYS_RESTART) {
1906 * Some (well, at least mine) BIOSes hang on reboot if
1909 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1910 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1915 static struct notifier_block kvm_reboot_notifier = {
1916 .notifier_call = kvm_reboot,
1920 static __init void kvm_init_debug(void)
1922 struct kvm_stats_debugfs_item *p;
1924 debugfs_dir = debugfs_create_dir("kvm", 0);
1925 for (p = debugfs_entries; p->name; ++p)
1926 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
1930 static void kvm_exit_debug(void)
1932 struct kvm_stats_debugfs_item *p;
1934 for (p = debugfs_entries; p->name; ++p)
1935 debugfs_remove(p->dentry);
1936 debugfs_remove(debugfs_dir);
1939 hpa_t bad_page_address;
1941 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
1946 printk(KERN_ERR "kvm: already loaded the other module\n");
1950 if (!ops->cpu_has_kvm_support()) {
1951 printk(KERN_ERR "kvm: no hardware support\n");
1954 if (ops->disabled_by_bios()) {
1955 printk(KERN_ERR "kvm: disabled by bios\n");
1961 r = kvm_arch_ops->hardware_setup();
1965 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
1966 register_reboot_notifier(&kvm_reboot_notifier);
1968 kvm_chardev_ops.owner = module;
1970 r = misc_register(&kvm_dev);
1972 printk (KERN_ERR "kvm: misc device register failed\n");
1979 unregister_reboot_notifier(&kvm_reboot_notifier);
1980 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1981 kvm_arch_ops->hardware_unsetup();
1985 void kvm_exit_arch(void)
1987 misc_deregister(&kvm_dev);
1989 unregister_reboot_notifier(&kvm_reboot_notifier);
1990 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
1991 kvm_arch_ops->hardware_unsetup();
1992 kvm_arch_ops = NULL;
1995 static __init int kvm_init(void)
1997 static struct page *bad_page;
2002 kvm_init_msr_list();
2004 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2009 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2010 memset(__va(bad_page_address), 0, PAGE_SIZE);
2019 static __exit void kvm_exit(void)
2022 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2025 module_init(kvm_init)
2026 module_exit(kvm_exit)
2028 EXPORT_SYMBOL_GPL(kvm_init_arch);
2029 EXPORT_SYMBOL_GPL(kvm_exit_arch);