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>
37 #include <linux/sysdev.h>
38 #include <linux/cpu.h>
40 #include "x86_emulate.h"
41 #include "segment_descriptor.h"
43 MODULE_AUTHOR("Qumranet");
44 MODULE_LICENSE("GPL");
46 static DEFINE_SPINLOCK(kvm_lock);
47 static LIST_HEAD(vm_list);
49 struct kvm_arch_ops *kvm_arch_ops;
50 struct kvm_stat kvm_stat;
51 EXPORT_SYMBOL_GPL(kvm_stat);
53 static struct kvm_stats_debugfs_item {
56 struct dentry *dentry;
57 } debugfs_entries[] = {
58 { "pf_fixed", &kvm_stat.pf_fixed },
59 { "pf_guest", &kvm_stat.pf_guest },
60 { "tlb_flush", &kvm_stat.tlb_flush },
61 { "invlpg", &kvm_stat.invlpg },
62 { "exits", &kvm_stat.exits },
63 { "io_exits", &kvm_stat.io_exits },
64 { "mmio_exits", &kvm_stat.mmio_exits },
65 { "signal_exits", &kvm_stat.signal_exits },
66 { "irq_window", &kvm_stat.irq_window_exits },
67 { "halt_exits", &kvm_stat.halt_exits },
68 { "request_irq", &kvm_stat.request_irq_exits },
69 { "irq_exits", &kvm_stat.irq_exits },
73 static struct dentry *debugfs_dir;
75 #define MAX_IO_MSRS 256
77 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
78 #define LMSW_GUEST_MASK 0x0eULL
79 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
80 #define CR8_RESEVED_BITS (~0x0fULL)
81 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
84 // LDT or TSS descriptor in the GDT. 16 bytes.
85 struct segment_descriptor_64 {
86 struct segment_descriptor s;
93 unsigned long segment_base(u16 selector)
95 struct descriptor_table gdt;
96 struct segment_descriptor *d;
97 unsigned long table_base;
98 typedef unsigned long ul;
104 asm ("sgdt %0" : "=m"(gdt));
105 table_base = gdt.base;
107 if (selector & 4) { /* from ldt */
110 asm ("sldt %0" : "=g"(ldt_selector));
111 table_base = segment_base(ldt_selector);
113 d = (struct segment_descriptor *)(table_base + (selector & ~7));
114 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
117 && (d->type == 2 || d->type == 9 || d->type == 11))
118 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
122 EXPORT_SYMBOL_GPL(segment_base);
124 static inline int valid_vcpu(int n)
126 return likely(n >= 0 && n < KVM_MAX_VCPUS);
129 int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
132 unsigned char *host_buf = dest;
133 unsigned long req_size = size;
141 paddr = gva_to_hpa(vcpu, addr);
143 if (is_error_hpa(paddr))
146 guest_buf = (hva_t)kmap_atomic(
147 pfn_to_page(paddr >> PAGE_SHIFT),
149 offset = addr & ~PAGE_MASK;
151 now = min(size, PAGE_SIZE - offset);
152 memcpy(host_buf, (void*)guest_buf, now);
156 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
158 return req_size - size;
160 EXPORT_SYMBOL_GPL(kvm_read_guest);
162 int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
165 unsigned char *host_buf = data;
166 unsigned long req_size = size;
174 paddr = gva_to_hpa(vcpu, addr);
176 if (is_error_hpa(paddr))
179 guest_buf = (hva_t)kmap_atomic(
180 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
181 offset = addr & ~PAGE_MASK;
183 now = min(size, PAGE_SIZE - offset);
184 memcpy((void*)guest_buf, host_buf, now);
188 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
190 return req_size - size;
192 EXPORT_SYMBOL_GPL(kvm_write_guest);
194 static int vcpu_slot(struct kvm_vcpu *vcpu)
196 return vcpu - vcpu->kvm->vcpus;
200 * Switches to specified vcpu, until a matching vcpu_put()
202 static struct kvm_vcpu *vcpu_load(struct kvm *kvm, int vcpu_slot)
204 struct kvm_vcpu *vcpu = &kvm->vcpus[vcpu_slot];
206 mutex_lock(&vcpu->mutex);
207 if (unlikely(!vcpu->vmcs)) {
208 mutex_unlock(&vcpu->mutex);
211 return kvm_arch_ops->vcpu_load(vcpu);
214 static void vcpu_put(struct kvm_vcpu *vcpu)
216 kvm_arch_ops->vcpu_put(vcpu);
217 mutex_unlock(&vcpu->mutex);
220 static int kvm_dev_open(struct inode *inode, struct file *filp)
222 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
228 spin_lock_init(&kvm->lock);
229 INIT_LIST_HEAD(&kvm->active_mmu_pages);
230 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
231 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
233 mutex_init(&vcpu->mutex);
236 vcpu->mmu.root_hpa = INVALID_PAGE;
237 INIT_LIST_HEAD(&vcpu->free_pages);
238 spin_lock(&kvm_lock);
239 list_add(&kvm->vm_list, &vm_list);
240 spin_unlock(&kvm_lock);
242 filp->private_data = kvm;
247 * Free any memory in @free but not in @dont.
249 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
250 struct kvm_memory_slot *dont)
254 if (!dont || free->phys_mem != dont->phys_mem)
255 if (free->phys_mem) {
256 for (i = 0; i < free->npages; ++i)
257 if (free->phys_mem[i])
258 __free_page(free->phys_mem[i]);
259 vfree(free->phys_mem);
262 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
263 vfree(free->dirty_bitmap);
265 free->phys_mem = NULL;
267 free->dirty_bitmap = NULL;
270 static void kvm_free_physmem(struct kvm *kvm)
274 for (i = 0; i < kvm->nmemslots; ++i)
275 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
278 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
280 if (!vcpu_load(vcpu->kvm, vcpu_slot(vcpu)))
283 kvm_mmu_destroy(vcpu);
285 kvm_arch_ops->vcpu_free(vcpu);
288 static void kvm_free_vcpus(struct kvm *kvm)
292 for (i = 0; i < KVM_MAX_VCPUS; ++i)
293 kvm_free_vcpu(&kvm->vcpus[i]);
296 static int kvm_dev_release(struct inode *inode, struct file *filp)
298 struct kvm *kvm = filp->private_data;
300 spin_lock(&kvm_lock);
301 list_del(&kvm->vm_list);
302 spin_unlock(&kvm_lock);
304 kvm_free_physmem(kvm);
309 static void inject_gp(struct kvm_vcpu *vcpu)
311 kvm_arch_ops->inject_gp(vcpu, 0);
315 * Load the pae pdptrs. Return true is they are all valid.
317 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
319 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
320 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
325 struct kvm_memory_slot *memslot;
327 spin_lock(&vcpu->kvm->lock);
328 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
329 /* FIXME: !memslot - emulate? 0xff? */
330 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
333 for (i = 0; i < 4; ++i) {
334 pdpte = pdpt[offset + i];
335 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
341 for (i = 0; i < 4; ++i)
342 vcpu->pdptrs[i] = pdpt[offset + i];
345 kunmap_atomic(pdpt, KM_USER0);
346 spin_unlock(&vcpu->kvm->lock);
351 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
353 if (cr0 & CR0_RESEVED_BITS) {
354 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
360 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
361 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
366 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
367 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
368 "and a clear PE flag\n");
373 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
375 if ((vcpu->shadow_efer & EFER_LME)) {
379 printk(KERN_DEBUG "set_cr0: #GP, start paging "
380 "in long mode while PAE is disabled\n");
384 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
386 printk(KERN_DEBUG "set_cr0: #GP, start paging "
387 "in long mode while CS.L == 1\n");
394 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
395 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
403 kvm_arch_ops->set_cr0(vcpu, cr0);
406 spin_lock(&vcpu->kvm->lock);
407 kvm_mmu_reset_context(vcpu);
408 spin_unlock(&vcpu->kvm->lock);
411 EXPORT_SYMBOL_GPL(set_cr0);
413 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
415 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
416 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
418 EXPORT_SYMBOL_GPL(lmsw);
420 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
422 if (cr4 & CR4_RESEVED_BITS) {
423 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
428 if (is_long_mode(vcpu)) {
429 if (!(cr4 & CR4_PAE_MASK)) {
430 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
435 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
436 && !load_pdptrs(vcpu, vcpu->cr3)) {
437 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
441 if (cr4 & CR4_VMXE_MASK) {
442 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
446 kvm_arch_ops->set_cr4(vcpu, cr4);
447 spin_lock(&vcpu->kvm->lock);
448 kvm_mmu_reset_context(vcpu);
449 spin_unlock(&vcpu->kvm->lock);
451 EXPORT_SYMBOL_GPL(set_cr4);
453 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
455 if (is_long_mode(vcpu)) {
456 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
457 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
462 if (cr3 & CR3_RESEVED_BITS) {
463 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
467 if (is_paging(vcpu) && is_pae(vcpu) &&
468 !load_pdptrs(vcpu, cr3)) {
469 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
477 spin_lock(&vcpu->kvm->lock);
479 * Does the new cr3 value map to physical memory? (Note, we
480 * catch an invalid cr3 even in real-mode, because it would
481 * cause trouble later on when we turn on paging anyway.)
483 * A real CPU would silently accept an invalid cr3 and would
484 * attempt to use it - with largely undefined (and often hard
485 * to debug) behavior on the guest side.
487 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
490 vcpu->mmu.new_cr3(vcpu);
491 spin_unlock(&vcpu->kvm->lock);
493 EXPORT_SYMBOL_GPL(set_cr3);
495 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
497 if ( cr8 & CR8_RESEVED_BITS) {
498 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
504 EXPORT_SYMBOL_GPL(set_cr8);
506 void fx_init(struct kvm_vcpu *vcpu)
508 struct __attribute__ ((__packed__)) fx_image_s {
514 u64 operand;// fpu dp
520 fx_save(vcpu->host_fx_image);
522 fx_save(vcpu->guest_fx_image);
523 fx_restore(vcpu->host_fx_image);
525 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
526 fx_image->mxcsr = 0x1f80;
527 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
528 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
530 EXPORT_SYMBOL_GPL(fx_init);
533 * Creates some virtual cpus. Good luck creating more than one.
535 static int kvm_dev_ioctl_create_vcpu(struct kvm *kvm, int n)
538 struct kvm_vcpu *vcpu;
544 vcpu = &kvm->vcpus[n];
546 mutex_lock(&vcpu->mutex);
549 mutex_unlock(&vcpu->mutex);
553 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
555 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
557 r = kvm_arch_ops->vcpu_create(vcpu);
561 r = kvm_mmu_create(vcpu);
565 kvm_arch_ops->vcpu_load(vcpu);
566 r = kvm_mmu_setup(vcpu);
568 r = kvm_arch_ops->vcpu_setup(vcpu);
578 mutex_unlock(&vcpu->mutex);
584 * Allocate some memory and give it an address in the guest physical address
587 * Discontiguous memory is allowed, mostly for framebuffers.
589 static int kvm_dev_ioctl_set_memory_region(struct kvm *kvm,
590 struct kvm_memory_region *mem)
594 unsigned long npages;
596 struct kvm_memory_slot *memslot;
597 struct kvm_memory_slot old, new;
598 int memory_config_version;
601 /* General sanity checks */
602 if (mem->memory_size & (PAGE_SIZE - 1))
604 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
606 if (mem->slot >= KVM_MEMORY_SLOTS)
608 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
611 memslot = &kvm->memslots[mem->slot];
612 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
613 npages = mem->memory_size >> PAGE_SHIFT;
616 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
619 spin_lock(&kvm->lock);
621 memory_config_version = kvm->memory_config_version;
622 new = old = *memslot;
624 new.base_gfn = base_gfn;
626 new.flags = mem->flags;
628 /* Disallow changing a memory slot's size. */
630 if (npages && old.npages && npages != old.npages)
633 /* Check for overlaps */
635 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
636 struct kvm_memory_slot *s = &kvm->memslots[i];
640 if (!((base_gfn + npages <= s->base_gfn) ||
641 (base_gfn >= s->base_gfn + s->npages)))
645 * Do memory allocations outside lock. memory_config_version will
648 spin_unlock(&kvm->lock);
650 /* Deallocate if slot is being removed */
654 /* Free page dirty bitmap if unneeded */
655 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
656 new.dirty_bitmap = NULL;
660 /* Allocate if a slot is being created */
661 if (npages && !new.phys_mem) {
662 new.phys_mem = vmalloc(npages * sizeof(struct page *));
667 memset(new.phys_mem, 0, npages * sizeof(struct page *));
668 for (i = 0; i < npages; ++i) {
669 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
671 if (!new.phys_mem[i])
673 new.phys_mem[i]->private = 0;
677 /* Allocate page dirty bitmap if needed */
678 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
679 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
681 new.dirty_bitmap = vmalloc(dirty_bytes);
682 if (!new.dirty_bitmap)
684 memset(new.dirty_bitmap, 0, dirty_bytes);
687 spin_lock(&kvm->lock);
689 if (memory_config_version != kvm->memory_config_version) {
690 spin_unlock(&kvm->lock);
691 kvm_free_physmem_slot(&new, &old);
699 if (mem->slot >= kvm->nmemslots)
700 kvm->nmemslots = mem->slot + 1;
703 ++kvm->memory_config_version;
705 spin_unlock(&kvm->lock);
707 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
708 struct kvm_vcpu *vcpu;
710 vcpu = vcpu_load(kvm, i);
713 kvm_mmu_reset_context(vcpu);
717 kvm_free_physmem_slot(&old, &new);
721 spin_unlock(&kvm->lock);
723 kvm_free_physmem_slot(&new, &old);
728 static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
730 spin_lock(&vcpu->kvm->lock);
731 kvm_mmu_slot_remove_write_access(vcpu, slot);
732 spin_unlock(&vcpu->kvm->lock);
736 * Get (and clear) the dirty memory log for a memory slot.
738 static int kvm_dev_ioctl_get_dirty_log(struct kvm *kvm,
739 struct kvm_dirty_log *log)
741 struct kvm_memory_slot *memslot;
745 unsigned long any = 0;
747 spin_lock(&kvm->lock);
750 * Prevent changes to guest memory configuration even while the lock
754 spin_unlock(&kvm->lock);
756 if (log->slot >= KVM_MEMORY_SLOTS)
759 memslot = &kvm->memslots[log->slot];
761 if (!memslot->dirty_bitmap)
764 n = ALIGN(memslot->npages, 8) / 8;
766 for (i = 0; !any && i < n; ++i)
767 any = memslot->dirty_bitmap[i];
770 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
775 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
776 struct kvm_vcpu *vcpu = vcpu_load(kvm, i);
781 do_remove_write_access(vcpu, log->slot);
782 memset(memslot->dirty_bitmap, 0, n);
785 kvm_arch_ops->tlb_flush(vcpu);
793 spin_lock(&kvm->lock);
795 spin_unlock(&kvm->lock);
799 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
803 for (i = 0; i < kvm->nmemslots; ++i) {
804 struct kvm_memory_slot *memslot = &kvm->memslots[i];
806 if (gfn >= memslot->base_gfn
807 && gfn < memslot->base_gfn + memslot->npages)
812 EXPORT_SYMBOL_GPL(gfn_to_memslot);
814 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
817 struct kvm_memory_slot *memslot = NULL;
818 unsigned long rel_gfn;
820 for (i = 0; i < kvm->nmemslots; ++i) {
821 memslot = &kvm->memslots[i];
823 if (gfn >= memslot->base_gfn
824 && gfn < memslot->base_gfn + memslot->npages) {
826 if (!memslot || !memslot->dirty_bitmap)
829 rel_gfn = gfn - memslot->base_gfn;
832 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
833 set_bit(rel_gfn, memslot->dirty_bitmap);
839 static int emulator_read_std(unsigned long addr,
842 struct x86_emulate_ctxt *ctxt)
844 struct kvm_vcpu *vcpu = ctxt->vcpu;
848 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
849 unsigned offset = addr & (PAGE_SIZE-1);
850 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
852 struct kvm_memory_slot *memslot;
855 if (gpa == UNMAPPED_GVA)
856 return X86EMUL_PROPAGATE_FAULT;
857 pfn = gpa >> PAGE_SHIFT;
858 memslot = gfn_to_memslot(vcpu->kvm, pfn);
860 return X86EMUL_UNHANDLEABLE;
861 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
863 memcpy(data, page + offset, tocopy);
865 kunmap_atomic(page, KM_USER0);
872 return X86EMUL_CONTINUE;
875 static int emulator_write_std(unsigned long addr,
878 struct x86_emulate_ctxt *ctxt)
880 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
882 return X86EMUL_UNHANDLEABLE;
885 static int emulator_read_emulated(unsigned long addr,
888 struct x86_emulate_ctxt *ctxt)
890 struct kvm_vcpu *vcpu = ctxt->vcpu;
892 if (vcpu->mmio_read_completed) {
893 memcpy(val, vcpu->mmio_data, bytes);
894 vcpu->mmio_read_completed = 0;
895 return X86EMUL_CONTINUE;
896 } else if (emulator_read_std(addr, val, bytes, ctxt)
898 return X86EMUL_CONTINUE;
900 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
902 if (gpa == UNMAPPED_GVA)
903 return X86EMUL_PROPAGATE_FAULT;
904 vcpu->mmio_needed = 1;
905 vcpu->mmio_phys_addr = gpa;
906 vcpu->mmio_size = bytes;
907 vcpu->mmio_is_write = 0;
909 return X86EMUL_UNHANDLEABLE;
913 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
914 unsigned long val, int bytes)
916 struct kvm_memory_slot *m;
920 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
922 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
925 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
926 kvm_mmu_pre_write(vcpu, gpa, bytes);
927 virt = kmap_atomic(page, KM_USER0);
928 memcpy(virt + offset_in_page(gpa), &val, bytes);
929 kunmap_atomic(virt, KM_USER0);
930 kvm_mmu_post_write(vcpu, gpa, bytes);
934 static int emulator_write_emulated(unsigned long addr,
937 struct x86_emulate_ctxt *ctxt)
939 struct kvm_vcpu *vcpu = ctxt->vcpu;
940 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
942 if (gpa == UNMAPPED_GVA)
943 return X86EMUL_PROPAGATE_FAULT;
945 if (emulator_write_phys(vcpu, gpa, val, bytes))
946 return X86EMUL_CONTINUE;
948 vcpu->mmio_needed = 1;
949 vcpu->mmio_phys_addr = gpa;
950 vcpu->mmio_size = bytes;
951 vcpu->mmio_is_write = 1;
952 memcpy(vcpu->mmio_data, &val, bytes);
954 return X86EMUL_CONTINUE;
957 static int emulator_cmpxchg_emulated(unsigned long addr,
961 struct x86_emulate_ctxt *ctxt)
967 printk(KERN_WARNING "kvm: emulating exchange as write\n");
969 return emulator_write_emulated(addr, new, bytes, ctxt);
974 static int emulator_cmpxchg8b_emulated(unsigned long addr,
975 unsigned long old_lo,
976 unsigned long old_hi,
977 unsigned long new_lo,
978 unsigned long new_hi,
979 struct x86_emulate_ctxt *ctxt)
986 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
988 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
989 if (r != X86EMUL_CONTINUE)
991 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
996 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
998 return kvm_arch_ops->get_segment_base(vcpu, seg);
1001 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1003 return X86EMUL_CONTINUE;
1006 int emulate_clts(struct kvm_vcpu *vcpu)
1010 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1011 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
1012 kvm_arch_ops->set_cr0(vcpu, cr0);
1013 return X86EMUL_CONTINUE;
1016 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1018 struct kvm_vcpu *vcpu = ctxt->vcpu;
1022 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1023 return X86EMUL_CONTINUE;
1025 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1027 return X86EMUL_UNHANDLEABLE;
1031 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1033 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1036 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1038 /* FIXME: better handling */
1039 return X86EMUL_UNHANDLEABLE;
1041 return X86EMUL_CONTINUE;
1044 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1046 static int reported;
1048 unsigned long rip = ctxt->vcpu->rip;
1049 unsigned long rip_linear;
1051 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1056 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1058 printk(KERN_ERR "emulation failed but !mmio_needed?"
1059 " rip %lx %02x %02x %02x %02x\n",
1060 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1064 struct x86_emulate_ops emulate_ops = {
1065 .read_std = emulator_read_std,
1066 .write_std = emulator_write_std,
1067 .read_emulated = emulator_read_emulated,
1068 .write_emulated = emulator_write_emulated,
1069 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1070 #ifdef CONFIG_X86_32
1071 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1075 int emulate_instruction(struct kvm_vcpu *vcpu,
1076 struct kvm_run *run,
1080 struct x86_emulate_ctxt emulate_ctxt;
1084 kvm_arch_ops->cache_regs(vcpu);
1086 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1088 emulate_ctxt.vcpu = vcpu;
1089 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1090 emulate_ctxt.cr2 = cr2;
1091 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1092 ? X86EMUL_MODE_REAL : cs_l
1093 ? X86EMUL_MODE_PROT64 : cs_db
1094 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1096 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1097 emulate_ctxt.cs_base = 0;
1098 emulate_ctxt.ds_base = 0;
1099 emulate_ctxt.es_base = 0;
1100 emulate_ctxt.ss_base = 0;
1102 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1103 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1104 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1105 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1108 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1109 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1111 vcpu->mmio_is_write = 0;
1112 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1114 if ((r || vcpu->mmio_is_write) && run) {
1115 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1116 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1117 run->mmio.len = vcpu->mmio_size;
1118 run->mmio.is_write = vcpu->mmio_is_write;
1122 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1123 return EMULATE_DONE;
1124 if (!vcpu->mmio_needed) {
1125 report_emulation_failure(&emulate_ctxt);
1126 return EMULATE_FAIL;
1128 return EMULATE_DO_MMIO;
1131 kvm_arch_ops->decache_regs(vcpu);
1132 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1134 if (vcpu->mmio_is_write)
1135 return EMULATE_DO_MMIO;
1137 return EMULATE_DONE;
1139 EXPORT_SYMBOL_GPL(emulate_instruction);
1141 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1143 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1146 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1148 struct descriptor_table dt = { limit, base };
1150 kvm_arch_ops->set_gdt(vcpu, &dt);
1153 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1155 struct descriptor_table dt = { limit, base };
1157 kvm_arch_ops->set_idt(vcpu, &dt);
1160 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1161 unsigned long *rflags)
1164 *rflags = kvm_arch_ops->get_rflags(vcpu);
1167 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1169 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1180 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1185 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1186 unsigned long *rflags)
1190 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1191 *rflags = kvm_arch_ops->get_rflags(vcpu);
1200 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1203 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1207 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1212 case 0xc0010010: /* SYSCFG */
1213 case 0xc0010015: /* HWCR */
1214 case MSR_IA32_PLATFORM_ID:
1215 case MSR_IA32_P5_MC_ADDR:
1216 case MSR_IA32_P5_MC_TYPE:
1217 case MSR_IA32_MC0_CTL:
1218 case MSR_IA32_MCG_STATUS:
1219 case MSR_IA32_MCG_CAP:
1220 case MSR_IA32_MC0_MISC:
1221 case MSR_IA32_MC0_MISC+4:
1222 case MSR_IA32_MC0_MISC+8:
1223 case MSR_IA32_MC0_MISC+12:
1224 case MSR_IA32_MC0_MISC+16:
1225 case MSR_IA32_UCODE_REV:
1226 case MSR_IA32_PERF_STATUS:
1227 /* MTRR registers */
1229 case 0x200 ... 0x2ff:
1232 case 0xcd: /* fsb frequency */
1235 case MSR_IA32_APICBASE:
1236 data = vcpu->apic_base;
1238 case MSR_IA32_MISC_ENABLE:
1239 data = vcpu->ia32_misc_enable_msr;
1241 #ifdef CONFIG_X86_64
1243 data = vcpu->shadow_efer;
1247 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1253 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1256 * Reads an msr value (of 'msr_index') into 'pdata'.
1257 * Returns 0 on success, non-0 otherwise.
1258 * Assumes vcpu_load() was already called.
1260 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1262 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1265 #ifdef CONFIG_X86_64
1267 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1269 if (efer & EFER_RESERVED_BITS) {
1270 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1277 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1278 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1283 kvm_arch_ops->set_efer(vcpu, efer);
1286 efer |= vcpu->shadow_efer & EFER_LMA;
1288 vcpu->shadow_efer = efer;
1293 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1296 #ifdef CONFIG_X86_64
1298 set_efer(vcpu, data);
1301 case MSR_IA32_MC0_STATUS:
1302 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1303 __FUNCTION__, data);
1305 case MSR_IA32_UCODE_REV:
1306 case MSR_IA32_UCODE_WRITE:
1307 case 0x200 ... 0x2ff: /* MTRRs */
1309 case MSR_IA32_APICBASE:
1310 vcpu->apic_base = data;
1312 case MSR_IA32_MISC_ENABLE:
1313 vcpu->ia32_misc_enable_msr = data;
1316 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1321 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1324 * Writes msr value into into the appropriate "register".
1325 * Returns 0 on success, non-0 otherwise.
1326 * Assumes vcpu_load() was already called.
1328 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1330 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1333 void kvm_resched(struct kvm_vcpu *vcpu)
1337 /* Cannot fail - no vcpu unplug yet. */
1338 vcpu_load(vcpu->kvm, vcpu_slot(vcpu));
1340 EXPORT_SYMBOL_GPL(kvm_resched);
1342 void load_msrs(struct vmx_msr_entry *e, int n)
1346 for (i = 0; i < n; ++i)
1347 wrmsrl(e[i].index, e[i].data);
1349 EXPORT_SYMBOL_GPL(load_msrs);
1351 void save_msrs(struct vmx_msr_entry *e, int n)
1355 for (i = 0; i < n; ++i)
1356 rdmsrl(e[i].index, e[i].data);
1358 EXPORT_SYMBOL_GPL(save_msrs);
1360 static int kvm_dev_ioctl_run(struct kvm *kvm, struct kvm_run *kvm_run)
1362 struct kvm_vcpu *vcpu;
1365 if (!valid_vcpu(kvm_run->vcpu))
1368 vcpu = vcpu_load(kvm, kvm_run->vcpu);
1372 /* re-sync apic's tpr */
1373 vcpu->cr8 = kvm_run->cr8;
1375 if (kvm_run->emulated) {
1376 kvm_arch_ops->skip_emulated_instruction(vcpu);
1377 kvm_run->emulated = 0;
1380 if (kvm_run->mmio_completed) {
1381 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1382 vcpu->mmio_read_completed = 1;
1385 vcpu->mmio_needed = 0;
1387 r = kvm_arch_ops->run(vcpu, kvm_run);
1393 static int kvm_dev_ioctl_get_regs(struct kvm *kvm, struct kvm_regs *regs)
1395 struct kvm_vcpu *vcpu;
1397 if (!valid_vcpu(regs->vcpu))
1400 vcpu = vcpu_load(kvm, regs->vcpu);
1404 kvm_arch_ops->cache_regs(vcpu);
1406 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1407 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1408 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1409 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1410 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1411 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1412 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1413 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1414 #ifdef CONFIG_X86_64
1415 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1416 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1417 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1418 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1419 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1420 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1421 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1422 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1425 regs->rip = vcpu->rip;
1426 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1429 * Don't leak debug flags in case they were set for guest debugging
1431 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1432 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1439 static int kvm_dev_ioctl_set_regs(struct kvm *kvm, struct kvm_regs *regs)
1441 struct kvm_vcpu *vcpu;
1443 if (!valid_vcpu(regs->vcpu))
1446 vcpu = vcpu_load(kvm, regs->vcpu);
1450 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1451 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1452 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1453 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1454 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1455 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1456 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1457 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1458 #ifdef CONFIG_X86_64
1459 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1460 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1461 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1462 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1463 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1464 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1465 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1466 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1469 vcpu->rip = regs->rip;
1470 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1472 kvm_arch_ops->decache_regs(vcpu);
1479 static void get_segment(struct kvm_vcpu *vcpu,
1480 struct kvm_segment *var, int seg)
1482 return kvm_arch_ops->get_segment(vcpu, var, seg);
1485 static int kvm_dev_ioctl_get_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1487 struct kvm_vcpu *vcpu;
1488 struct descriptor_table dt;
1490 if (!valid_vcpu(sregs->vcpu))
1492 vcpu = vcpu_load(kvm, sregs->vcpu);
1496 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1497 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1498 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1499 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1500 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1501 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1503 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1504 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1506 kvm_arch_ops->get_idt(vcpu, &dt);
1507 sregs->idt.limit = dt.limit;
1508 sregs->idt.base = dt.base;
1509 kvm_arch_ops->get_gdt(vcpu, &dt);
1510 sregs->gdt.limit = dt.limit;
1511 sregs->gdt.base = dt.base;
1513 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1514 sregs->cr0 = vcpu->cr0;
1515 sregs->cr2 = vcpu->cr2;
1516 sregs->cr3 = vcpu->cr3;
1517 sregs->cr4 = vcpu->cr4;
1518 sregs->cr8 = vcpu->cr8;
1519 sregs->efer = vcpu->shadow_efer;
1520 sregs->apic_base = vcpu->apic_base;
1522 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1523 sizeof sregs->interrupt_bitmap);
1530 static void set_segment(struct kvm_vcpu *vcpu,
1531 struct kvm_segment *var, int seg)
1533 return kvm_arch_ops->set_segment(vcpu, var, seg);
1536 static int kvm_dev_ioctl_set_sregs(struct kvm *kvm, struct kvm_sregs *sregs)
1538 struct kvm_vcpu *vcpu;
1539 int mmu_reset_needed = 0;
1541 struct descriptor_table dt;
1543 if (!valid_vcpu(sregs->vcpu))
1545 vcpu = vcpu_load(kvm, sregs->vcpu);
1549 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1550 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1551 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1552 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1553 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1554 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1556 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1557 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1559 dt.limit = sregs->idt.limit;
1560 dt.base = sregs->idt.base;
1561 kvm_arch_ops->set_idt(vcpu, &dt);
1562 dt.limit = sregs->gdt.limit;
1563 dt.base = sregs->gdt.base;
1564 kvm_arch_ops->set_gdt(vcpu, &dt);
1566 vcpu->cr2 = sregs->cr2;
1567 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1568 vcpu->cr3 = sregs->cr3;
1570 vcpu->cr8 = sregs->cr8;
1572 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1573 #ifdef CONFIG_X86_64
1574 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1576 vcpu->apic_base = sregs->apic_base;
1578 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1580 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1581 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1583 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1584 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1585 if (!is_long_mode(vcpu) && is_pae(vcpu))
1586 load_pdptrs(vcpu, vcpu->cr3);
1588 if (mmu_reset_needed)
1589 kvm_mmu_reset_context(vcpu);
1591 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1592 sizeof vcpu->irq_pending);
1593 vcpu->irq_summary = 0;
1594 for (i = 0; i < NR_IRQ_WORDS; ++i)
1595 if (vcpu->irq_pending[i])
1596 __set_bit(i, &vcpu->irq_summary);
1604 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1605 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1607 * This list is modified at module load time to reflect the
1608 * capabilities of the host cpu.
1610 static u32 msrs_to_save[] = {
1611 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1613 #ifdef CONFIG_X86_64
1614 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1616 MSR_IA32_TIME_STAMP_COUNTER,
1619 static unsigned num_msrs_to_save;
1621 static u32 emulated_msrs[] = {
1622 MSR_IA32_MISC_ENABLE,
1625 static __init void kvm_init_msr_list(void)
1630 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1631 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1634 msrs_to_save[j] = msrs_to_save[i];
1637 num_msrs_to_save = j;
1641 * Adapt set_msr() to msr_io()'s calling convention
1643 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1645 return set_msr(vcpu, index, *data);
1649 * Read or write a bunch of msrs. All parameters are kernel addresses.
1651 * @return number of msrs set successfully.
1653 static int __msr_io(struct kvm *kvm, struct kvm_msrs *msrs,
1654 struct kvm_msr_entry *entries,
1655 int (*do_msr)(struct kvm_vcpu *vcpu,
1656 unsigned index, u64 *data))
1658 struct kvm_vcpu *vcpu;
1661 if (!valid_vcpu(msrs->vcpu))
1664 vcpu = vcpu_load(kvm, msrs->vcpu);
1668 for (i = 0; i < msrs->nmsrs; ++i)
1669 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1678 * Read or write a bunch of msrs. Parameters are user addresses.
1680 * @return number of msrs set successfully.
1682 static int msr_io(struct kvm *kvm, struct kvm_msrs __user *user_msrs,
1683 int (*do_msr)(struct kvm_vcpu *vcpu,
1684 unsigned index, u64 *data),
1687 struct kvm_msrs msrs;
1688 struct kvm_msr_entry *entries;
1693 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1697 if (msrs.nmsrs >= MAX_IO_MSRS)
1701 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1702 entries = vmalloc(size);
1707 if (copy_from_user(entries, user_msrs->entries, size))
1710 r = n = __msr_io(kvm, &msrs, entries, do_msr);
1715 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1727 * Translate a guest virtual address to a guest physical address.
1729 static int kvm_dev_ioctl_translate(struct kvm *kvm, struct kvm_translation *tr)
1731 unsigned long vaddr = tr->linear_address;
1732 struct kvm_vcpu *vcpu;
1735 vcpu = vcpu_load(kvm, tr->vcpu);
1738 spin_lock(&kvm->lock);
1739 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1740 tr->physical_address = gpa;
1741 tr->valid = gpa != UNMAPPED_GVA;
1744 spin_unlock(&kvm->lock);
1750 static int kvm_dev_ioctl_interrupt(struct kvm *kvm, struct kvm_interrupt *irq)
1752 struct kvm_vcpu *vcpu;
1754 if (!valid_vcpu(irq->vcpu))
1756 if (irq->irq < 0 || irq->irq >= 256)
1758 vcpu = vcpu_load(kvm, irq->vcpu);
1762 set_bit(irq->irq, vcpu->irq_pending);
1763 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1770 static int kvm_dev_ioctl_debug_guest(struct kvm *kvm,
1771 struct kvm_debug_guest *dbg)
1773 struct kvm_vcpu *vcpu;
1776 if (!valid_vcpu(dbg->vcpu))
1778 vcpu = vcpu_load(kvm, dbg->vcpu);
1782 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1789 static long kvm_dev_ioctl(struct file *filp,
1790 unsigned int ioctl, unsigned long arg)
1792 struct kvm *kvm = filp->private_data;
1793 void __user *argp = (void __user *)arg;
1797 case KVM_GET_API_VERSION:
1798 r = KVM_API_VERSION;
1800 case KVM_CREATE_VCPU:
1801 r = kvm_dev_ioctl_create_vcpu(kvm, arg);
1806 struct kvm_run kvm_run;
1809 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
1811 r = kvm_dev_ioctl_run(kvm, &kvm_run);
1812 if (r < 0 && r != -EINTR)
1814 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
1820 case KVM_GET_REGS: {
1821 struct kvm_regs kvm_regs;
1824 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
1826 r = kvm_dev_ioctl_get_regs(kvm, &kvm_regs);
1830 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
1835 case KVM_SET_REGS: {
1836 struct kvm_regs kvm_regs;
1839 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
1841 r = kvm_dev_ioctl_set_regs(kvm, &kvm_regs);
1847 case KVM_GET_SREGS: {
1848 struct kvm_sregs kvm_sregs;
1851 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1853 r = kvm_dev_ioctl_get_sregs(kvm, &kvm_sregs);
1857 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
1862 case KVM_SET_SREGS: {
1863 struct kvm_sregs kvm_sregs;
1866 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
1868 r = kvm_dev_ioctl_set_sregs(kvm, &kvm_sregs);
1874 case KVM_TRANSLATE: {
1875 struct kvm_translation tr;
1878 if (copy_from_user(&tr, argp, sizeof tr))
1880 r = kvm_dev_ioctl_translate(kvm, &tr);
1884 if (copy_to_user(argp, &tr, sizeof tr))
1889 case KVM_INTERRUPT: {
1890 struct kvm_interrupt irq;
1893 if (copy_from_user(&irq, argp, sizeof irq))
1895 r = kvm_dev_ioctl_interrupt(kvm, &irq);
1901 case KVM_DEBUG_GUEST: {
1902 struct kvm_debug_guest dbg;
1905 if (copy_from_user(&dbg, argp, sizeof dbg))
1907 r = kvm_dev_ioctl_debug_guest(kvm, &dbg);
1913 case KVM_SET_MEMORY_REGION: {
1914 struct kvm_memory_region kvm_mem;
1917 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
1919 r = kvm_dev_ioctl_set_memory_region(kvm, &kvm_mem);
1924 case KVM_GET_DIRTY_LOG: {
1925 struct kvm_dirty_log log;
1928 if (copy_from_user(&log, argp, sizeof log))
1930 r = kvm_dev_ioctl_get_dirty_log(kvm, &log);
1936 r = msr_io(kvm, argp, get_msr, 1);
1939 r = msr_io(kvm, argp, do_set_msr, 0);
1941 case KVM_GET_MSR_INDEX_LIST: {
1942 struct kvm_msr_list __user *user_msr_list = argp;
1943 struct kvm_msr_list msr_list;
1947 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
1950 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
1951 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
1954 if (n < num_msrs_to_save)
1957 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
1958 num_msrs_to_save * sizeof(u32)))
1960 if (copy_to_user(user_msr_list->indices
1961 + num_msrs_to_save * sizeof(u32),
1963 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
1975 static struct page *kvm_dev_nopage(struct vm_area_struct *vma,
1976 unsigned long address,
1979 struct kvm *kvm = vma->vm_file->private_data;
1980 unsigned long pgoff;
1981 struct kvm_memory_slot *slot;
1984 *type = VM_FAULT_MINOR;
1985 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1986 slot = gfn_to_memslot(kvm, pgoff);
1988 return NOPAGE_SIGBUS;
1989 page = gfn_to_page(slot, pgoff);
1991 return NOPAGE_SIGBUS;
1996 static struct vm_operations_struct kvm_dev_vm_ops = {
1997 .nopage = kvm_dev_nopage,
2000 static int kvm_dev_mmap(struct file *file, struct vm_area_struct *vma)
2002 vma->vm_ops = &kvm_dev_vm_ops;
2006 static struct file_operations kvm_chardev_ops = {
2007 .open = kvm_dev_open,
2008 .release = kvm_dev_release,
2009 .unlocked_ioctl = kvm_dev_ioctl,
2010 .compat_ioctl = kvm_dev_ioctl,
2011 .mmap = kvm_dev_mmap,
2014 static struct miscdevice kvm_dev = {
2020 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2023 if (val == SYS_RESTART) {
2025 * Some (well, at least mine) BIOSes hang on reboot if
2028 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2029 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2034 static struct notifier_block kvm_reboot_notifier = {
2035 .notifier_call = kvm_reboot,
2040 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2043 static void decache_vcpus_on_cpu(int cpu)
2046 struct kvm_vcpu *vcpu;
2049 spin_lock(&kvm_lock);
2050 list_for_each_entry(vm, &vm_list, vm_list)
2051 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2052 vcpu = &vm->vcpus[i];
2054 * If the vcpu is locked, then it is running on some
2055 * other cpu and therefore it is not cached on the
2058 * If it's not locked, check the last cpu it executed
2061 if (mutex_trylock(&vcpu->mutex)) {
2062 if (vcpu->cpu == cpu) {
2063 kvm_arch_ops->vcpu_decache(vcpu);
2066 mutex_unlock(&vcpu->mutex);
2069 spin_unlock(&kvm_lock);
2072 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2078 case CPU_DOWN_PREPARE:
2079 case CPU_UP_CANCELED:
2080 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2082 decache_vcpus_on_cpu(cpu);
2083 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2087 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2089 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2096 static struct notifier_block kvm_cpu_notifier = {
2097 .notifier_call = kvm_cpu_hotplug,
2098 .priority = 20, /* must be > scheduler priority */
2101 static __init void kvm_init_debug(void)
2103 struct kvm_stats_debugfs_item *p;
2105 debugfs_dir = debugfs_create_dir("kvm", NULL);
2106 for (p = debugfs_entries; p->name; ++p)
2107 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2111 static void kvm_exit_debug(void)
2113 struct kvm_stats_debugfs_item *p;
2115 for (p = debugfs_entries; p->name; ++p)
2116 debugfs_remove(p->dentry);
2117 debugfs_remove(debugfs_dir);
2120 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2122 decache_vcpus_on_cpu(raw_smp_processor_id());
2123 on_each_cpu(kvm_arch_ops->hardware_disable, 0, 0, 1);
2127 static int kvm_resume(struct sys_device *dev)
2129 on_each_cpu(kvm_arch_ops->hardware_enable, 0, 0, 1);
2133 static struct sysdev_class kvm_sysdev_class = {
2134 set_kset_name("kvm"),
2135 .suspend = kvm_suspend,
2136 .resume = kvm_resume,
2139 static struct sys_device kvm_sysdev = {
2141 .cls = &kvm_sysdev_class,
2144 hpa_t bad_page_address;
2146 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2151 printk(KERN_ERR "kvm: already loaded the other module\n");
2155 if (!ops->cpu_has_kvm_support()) {
2156 printk(KERN_ERR "kvm: no hardware support\n");
2159 if (ops->disabled_by_bios()) {
2160 printk(KERN_ERR "kvm: disabled by bios\n");
2166 r = kvm_arch_ops->hardware_setup();
2170 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2171 r = register_cpu_notifier(&kvm_cpu_notifier);
2174 register_reboot_notifier(&kvm_reboot_notifier);
2176 r = sysdev_class_register(&kvm_sysdev_class);
2180 r = sysdev_register(&kvm_sysdev);
2184 kvm_chardev_ops.owner = module;
2186 r = misc_register(&kvm_dev);
2188 printk (KERN_ERR "kvm: misc device register failed\n");
2195 sysdev_unregister(&kvm_sysdev);
2197 sysdev_class_unregister(&kvm_sysdev_class);
2199 unregister_reboot_notifier(&kvm_reboot_notifier);
2200 unregister_cpu_notifier(&kvm_cpu_notifier);
2202 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2203 kvm_arch_ops->hardware_unsetup();
2207 void kvm_exit_arch(void)
2209 misc_deregister(&kvm_dev);
2210 sysdev_unregister(&kvm_sysdev);
2211 sysdev_class_unregister(&kvm_sysdev_class);
2212 unregister_reboot_notifier(&kvm_reboot_notifier);
2213 unregister_cpu_notifier(&kvm_cpu_notifier);
2214 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2215 kvm_arch_ops->hardware_unsetup();
2216 kvm_arch_ops = NULL;
2219 static __init int kvm_init(void)
2221 static struct page *bad_page;
2226 kvm_init_msr_list();
2228 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2233 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2234 memset(__va(bad_page_address), 0, PAGE_SIZE);
2243 static __exit void kvm_exit(void)
2246 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2249 module_init(kvm_init)
2250 module_exit(kvm_exit)
2252 EXPORT_SYMBOL_GPL(kvm_init_arch);
2253 EXPORT_SYMBOL_GPL(kvm_exit_arch);