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>
39 #include <linux/file.h>
41 #include <linux/mount.h>
43 #include "x86_emulate.h"
44 #include "segment_descriptor.h"
46 MODULE_AUTHOR("Qumranet");
47 MODULE_LICENSE("GPL");
49 static DEFINE_SPINLOCK(kvm_lock);
50 static LIST_HEAD(vm_list);
52 struct kvm_arch_ops *kvm_arch_ops;
53 struct kvm_stat kvm_stat;
54 EXPORT_SYMBOL_GPL(kvm_stat);
56 static struct kvm_stats_debugfs_item {
59 struct dentry *dentry;
60 } debugfs_entries[] = {
61 { "pf_fixed", &kvm_stat.pf_fixed },
62 { "pf_guest", &kvm_stat.pf_guest },
63 { "tlb_flush", &kvm_stat.tlb_flush },
64 { "invlpg", &kvm_stat.invlpg },
65 { "exits", &kvm_stat.exits },
66 { "io_exits", &kvm_stat.io_exits },
67 { "mmio_exits", &kvm_stat.mmio_exits },
68 { "signal_exits", &kvm_stat.signal_exits },
69 { "irq_window", &kvm_stat.irq_window_exits },
70 { "halt_exits", &kvm_stat.halt_exits },
71 { "request_irq", &kvm_stat.request_irq_exits },
72 { "irq_exits", &kvm_stat.irq_exits },
76 static struct dentry *debugfs_dir;
78 #define KVMFS_MAGIC 0x19700426
79 struct vfsmount *kvmfs_mnt;
81 #define MAX_IO_MSRS 256
83 #define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
84 #define LMSW_GUEST_MASK 0x0eULL
85 #define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
86 #define CR8_RESEVED_BITS (~0x0fULL)
87 #define EFER_RESERVED_BITS 0xfffffffffffff2fe
90 // LDT or TSS descriptor in the GDT. 16 bytes.
91 struct segment_descriptor_64 {
92 struct segment_descriptor s;
99 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
102 static struct inode *kvmfs_inode(struct file_operations *fops)
105 struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);
113 * Mark the inode dirty from the very beginning,
114 * that way it will never be moved to the dirty
115 * list because mark_inode_dirty() will think
116 * that it already _is_ on the dirty list.
118 inode->i_state = I_DIRTY;
119 inode->i_mode = S_IRUSR | S_IWUSR;
120 inode->i_uid = current->fsuid;
121 inode->i_gid = current->fsgid;
122 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
126 return ERR_PTR(error);
129 static struct file *kvmfs_file(struct inode *inode, void *private_data)
131 struct file *file = get_empty_filp();
134 return ERR_PTR(-ENFILE);
136 file->f_path.mnt = mntget(kvmfs_mnt);
137 file->f_path.dentry = d_alloc_anon(inode);
138 if (!file->f_path.dentry)
139 return ERR_PTR(-ENOMEM);
140 file->f_mapping = inode->i_mapping;
143 file->f_flags = O_RDWR;
144 file->f_op = inode->i_fop;
145 file->f_mode = FMODE_READ | FMODE_WRITE;
147 file->private_data = private_data;
151 unsigned long segment_base(u16 selector)
153 struct descriptor_table gdt;
154 struct segment_descriptor *d;
155 unsigned long table_base;
156 typedef unsigned long ul;
162 asm ("sgdt %0" : "=m"(gdt));
163 table_base = gdt.base;
165 if (selector & 4) { /* from ldt */
168 asm ("sldt %0" : "=g"(ldt_selector));
169 table_base = segment_base(ldt_selector);
171 d = (struct segment_descriptor *)(table_base + (selector & ~7));
172 v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
175 && (d->type == 2 || d->type == 9 || d->type == 11))
176 v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
180 EXPORT_SYMBOL_GPL(segment_base);
182 static inline int valid_vcpu(int n)
184 return likely(n >= 0 && n < KVM_MAX_VCPUS);
187 int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
190 unsigned char *host_buf = dest;
191 unsigned long req_size = size;
199 paddr = gva_to_hpa(vcpu, addr);
201 if (is_error_hpa(paddr))
204 guest_buf = (hva_t)kmap_atomic(
205 pfn_to_page(paddr >> PAGE_SHIFT),
207 offset = addr & ~PAGE_MASK;
209 now = min(size, PAGE_SIZE - offset);
210 memcpy(host_buf, (void*)guest_buf, now);
214 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
216 return req_size - size;
218 EXPORT_SYMBOL_GPL(kvm_read_guest);
220 int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
223 unsigned char *host_buf = data;
224 unsigned long req_size = size;
232 paddr = gva_to_hpa(vcpu, addr);
234 if (is_error_hpa(paddr))
237 guest_buf = (hva_t)kmap_atomic(
238 pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
239 offset = addr & ~PAGE_MASK;
241 now = min(size, PAGE_SIZE - offset);
242 memcpy((void*)guest_buf, host_buf, now);
246 kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
248 return req_size - size;
250 EXPORT_SYMBOL_GPL(kvm_write_guest);
253 * Switches to specified vcpu, until a matching vcpu_put()
255 static void vcpu_load(struct kvm_vcpu *vcpu)
257 mutex_lock(&vcpu->mutex);
258 kvm_arch_ops->vcpu_load(vcpu);
262 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
263 * if the slot is not populated.
265 static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
267 struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
269 mutex_lock(&vcpu->mutex);
271 mutex_unlock(&vcpu->mutex);
274 kvm_arch_ops->vcpu_load(vcpu);
278 static void vcpu_put(struct kvm_vcpu *vcpu)
280 kvm_arch_ops->vcpu_put(vcpu);
281 mutex_unlock(&vcpu->mutex);
284 static struct kvm *kvm_create_vm(void)
286 struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
290 return ERR_PTR(-ENOMEM);
292 spin_lock_init(&kvm->lock);
293 INIT_LIST_HEAD(&kvm->active_mmu_pages);
294 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
295 struct kvm_vcpu *vcpu = &kvm->vcpus[i];
297 mutex_init(&vcpu->mutex);
300 vcpu->mmu.root_hpa = INVALID_PAGE;
301 INIT_LIST_HEAD(&vcpu->free_pages);
302 spin_lock(&kvm_lock);
303 list_add(&kvm->vm_list, &vm_list);
304 spin_unlock(&kvm_lock);
309 static int kvm_dev_open(struct inode *inode, struct file *filp)
315 * Free any memory in @free but not in @dont.
317 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
318 struct kvm_memory_slot *dont)
322 if (!dont || free->phys_mem != dont->phys_mem)
323 if (free->phys_mem) {
324 for (i = 0; i < free->npages; ++i)
325 if (free->phys_mem[i])
326 __free_page(free->phys_mem[i]);
327 vfree(free->phys_mem);
330 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
331 vfree(free->dirty_bitmap);
333 free->phys_mem = NULL;
335 free->dirty_bitmap = NULL;
338 static void kvm_free_physmem(struct kvm *kvm)
342 for (i = 0; i < kvm->nmemslots; ++i)
343 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
346 static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
352 kvm_mmu_destroy(vcpu);
354 kvm_arch_ops->vcpu_free(vcpu);
357 static void kvm_free_vcpus(struct kvm *kvm)
361 for (i = 0; i < KVM_MAX_VCPUS; ++i)
362 kvm_free_vcpu(&kvm->vcpus[i]);
365 static int kvm_dev_release(struct inode *inode, struct file *filp)
370 static void kvm_destroy_vm(struct kvm *kvm)
372 spin_lock(&kvm_lock);
373 list_del(&kvm->vm_list);
374 spin_unlock(&kvm_lock);
376 kvm_free_physmem(kvm);
380 static int kvm_vm_release(struct inode *inode, struct file *filp)
382 struct kvm *kvm = filp->private_data;
388 static void inject_gp(struct kvm_vcpu *vcpu)
390 kvm_arch_ops->inject_gp(vcpu, 0);
394 * Load the pae pdptrs. Return true is they are all valid.
396 static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
398 gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
399 unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
404 struct kvm_memory_slot *memslot;
406 spin_lock(&vcpu->kvm->lock);
407 memslot = gfn_to_memslot(vcpu->kvm, pdpt_gfn);
408 /* FIXME: !memslot - emulate? 0xff? */
409 pdpt = kmap_atomic(gfn_to_page(memslot, pdpt_gfn), KM_USER0);
412 for (i = 0; i < 4; ++i) {
413 pdpte = pdpt[offset + i];
414 if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
420 for (i = 0; i < 4; ++i)
421 vcpu->pdptrs[i] = pdpt[offset + i];
424 kunmap_atomic(pdpt, KM_USER0);
425 spin_unlock(&vcpu->kvm->lock);
430 void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
432 if (cr0 & CR0_RESEVED_BITS) {
433 printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
439 if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
440 printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
445 if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
446 printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
447 "and a clear PE flag\n");
452 if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
454 if ((vcpu->shadow_efer & EFER_LME)) {
458 printk(KERN_DEBUG "set_cr0: #GP, start paging "
459 "in long mode while PAE is disabled\n");
463 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
465 printk(KERN_DEBUG "set_cr0: #GP, start paging "
466 "in long mode while CS.L == 1\n");
473 if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
474 printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
482 kvm_arch_ops->set_cr0(vcpu, cr0);
485 spin_lock(&vcpu->kvm->lock);
486 kvm_mmu_reset_context(vcpu);
487 spin_unlock(&vcpu->kvm->lock);
490 EXPORT_SYMBOL_GPL(set_cr0);
492 void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
494 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
495 set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
497 EXPORT_SYMBOL_GPL(lmsw);
499 void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
501 if (cr4 & CR4_RESEVED_BITS) {
502 printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
507 if (is_long_mode(vcpu)) {
508 if (!(cr4 & CR4_PAE_MASK)) {
509 printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
514 } else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
515 && !load_pdptrs(vcpu, vcpu->cr3)) {
516 printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
520 if (cr4 & CR4_VMXE_MASK) {
521 printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
525 kvm_arch_ops->set_cr4(vcpu, cr4);
526 spin_lock(&vcpu->kvm->lock);
527 kvm_mmu_reset_context(vcpu);
528 spin_unlock(&vcpu->kvm->lock);
530 EXPORT_SYMBOL_GPL(set_cr4);
532 void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
534 if (is_long_mode(vcpu)) {
535 if (cr3 & CR3_L_MODE_RESEVED_BITS) {
536 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
541 if (cr3 & CR3_RESEVED_BITS) {
542 printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
546 if (is_paging(vcpu) && is_pae(vcpu) &&
547 !load_pdptrs(vcpu, cr3)) {
548 printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
556 spin_lock(&vcpu->kvm->lock);
558 * Does the new cr3 value map to physical memory? (Note, we
559 * catch an invalid cr3 even in real-mode, because it would
560 * cause trouble later on when we turn on paging anyway.)
562 * A real CPU would silently accept an invalid cr3 and would
563 * attempt to use it - with largely undefined (and often hard
564 * to debug) behavior on the guest side.
566 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
569 vcpu->mmu.new_cr3(vcpu);
570 spin_unlock(&vcpu->kvm->lock);
572 EXPORT_SYMBOL_GPL(set_cr3);
574 void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
576 if ( cr8 & CR8_RESEVED_BITS) {
577 printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
583 EXPORT_SYMBOL_GPL(set_cr8);
585 void fx_init(struct kvm_vcpu *vcpu)
587 struct __attribute__ ((__packed__)) fx_image_s {
593 u64 operand;// fpu dp
599 fx_save(vcpu->host_fx_image);
601 fx_save(vcpu->guest_fx_image);
602 fx_restore(vcpu->host_fx_image);
604 fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
605 fx_image->mxcsr = 0x1f80;
606 memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
607 0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
609 EXPORT_SYMBOL_GPL(fx_init);
612 * Allocate some memory and give it an address in the guest physical address
615 * Discontiguous memory is allowed, mostly for framebuffers.
617 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
618 struct kvm_memory_region *mem)
622 unsigned long npages;
624 struct kvm_memory_slot *memslot;
625 struct kvm_memory_slot old, new;
626 int memory_config_version;
629 /* General sanity checks */
630 if (mem->memory_size & (PAGE_SIZE - 1))
632 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
634 if (mem->slot >= KVM_MEMORY_SLOTS)
636 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
639 memslot = &kvm->memslots[mem->slot];
640 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
641 npages = mem->memory_size >> PAGE_SHIFT;
644 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
647 spin_lock(&kvm->lock);
649 memory_config_version = kvm->memory_config_version;
650 new = old = *memslot;
652 new.base_gfn = base_gfn;
654 new.flags = mem->flags;
656 /* Disallow changing a memory slot's size. */
658 if (npages && old.npages && npages != old.npages)
661 /* Check for overlaps */
663 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
664 struct kvm_memory_slot *s = &kvm->memslots[i];
668 if (!((base_gfn + npages <= s->base_gfn) ||
669 (base_gfn >= s->base_gfn + s->npages)))
673 * Do memory allocations outside lock. memory_config_version will
676 spin_unlock(&kvm->lock);
678 /* Deallocate if slot is being removed */
682 /* Free page dirty bitmap if unneeded */
683 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
684 new.dirty_bitmap = NULL;
688 /* Allocate if a slot is being created */
689 if (npages && !new.phys_mem) {
690 new.phys_mem = vmalloc(npages * sizeof(struct page *));
695 memset(new.phys_mem, 0, npages * sizeof(struct page *));
696 for (i = 0; i < npages; ++i) {
697 new.phys_mem[i] = alloc_page(GFP_HIGHUSER
699 if (!new.phys_mem[i])
701 set_page_private(new.phys_mem[i],0);
705 /* Allocate page dirty bitmap if needed */
706 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
707 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
709 new.dirty_bitmap = vmalloc(dirty_bytes);
710 if (!new.dirty_bitmap)
712 memset(new.dirty_bitmap, 0, dirty_bytes);
715 spin_lock(&kvm->lock);
717 if (memory_config_version != kvm->memory_config_version) {
718 spin_unlock(&kvm->lock);
719 kvm_free_physmem_slot(&new, &old);
727 if (mem->slot >= kvm->nmemslots)
728 kvm->nmemslots = mem->slot + 1;
731 ++kvm->memory_config_version;
733 spin_unlock(&kvm->lock);
735 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
736 struct kvm_vcpu *vcpu;
738 vcpu = vcpu_load_slot(kvm, i);
741 kvm_mmu_reset_context(vcpu);
745 kvm_free_physmem_slot(&old, &new);
749 spin_unlock(&kvm->lock);
751 kvm_free_physmem_slot(&new, &old);
756 static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
758 spin_lock(&vcpu->kvm->lock);
759 kvm_mmu_slot_remove_write_access(vcpu, slot);
760 spin_unlock(&vcpu->kvm->lock);
764 * Get (and clear) the dirty memory log for a memory slot.
766 static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
767 struct kvm_dirty_log *log)
769 struct kvm_memory_slot *memslot;
773 unsigned long any = 0;
775 spin_lock(&kvm->lock);
778 * Prevent changes to guest memory configuration even while the lock
782 spin_unlock(&kvm->lock);
784 if (log->slot >= KVM_MEMORY_SLOTS)
787 memslot = &kvm->memslots[log->slot];
789 if (!memslot->dirty_bitmap)
792 n = ALIGN(memslot->npages, 8) / 8;
794 for (i = 0; !any && i < n; ++i)
795 any = memslot->dirty_bitmap[i];
798 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
803 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
804 struct kvm_vcpu *vcpu;
806 vcpu = vcpu_load_slot(kvm, i);
810 do_remove_write_access(vcpu, log->slot);
811 memset(memslot->dirty_bitmap, 0, n);
814 kvm_arch_ops->tlb_flush(vcpu);
822 spin_lock(&kvm->lock);
824 spin_unlock(&kvm->lock);
828 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
832 for (i = 0; i < kvm->nmemslots; ++i) {
833 struct kvm_memory_slot *memslot = &kvm->memslots[i];
835 if (gfn >= memslot->base_gfn
836 && gfn < memslot->base_gfn + memslot->npages)
841 EXPORT_SYMBOL_GPL(gfn_to_memslot);
843 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
846 struct kvm_memory_slot *memslot = NULL;
847 unsigned long rel_gfn;
849 for (i = 0; i < kvm->nmemslots; ++i) {
850 memslot = &kvm->memslots[i];
852 if (gfn >= memslot->base_gfn
853 && gfn < memslot->base_gfn + memslot->npages) {
855 if (!memslot || !memslot->dirty_bitmap)
858 rel_gfn = gfn - memslot->base_gfn;
861 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
862 set_bit(rel_gfn, memslot->dirty_bitmap);
868 static int emulator_read_std(unsigned long addr,
871 struct x86_emulate_ctxt *ctxt)
873 struct kvm_vcpu *vcpu = ctxt->vcpu;
877 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
878 unsigned offset = addr & (PAGE_SIZE-1);
879 unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
881 struct kvm_memory_slot *memslot;
884 if (gpa == UNMAPPED_GVA)
885 return X86EMUL_PROPAGATE_FAULT;
886 pfn = gpa >> PAGE_SHIFT;
887 memslot = gfn_to_memslot(vcpu->kvm, pfn);
889 return X86EMUL_UNHANDLEABLE;
890 page = kmap_atomic(gfn_to_page(memslot, pfn), KM_USER0);
892 memcpy(data, page + offset, tocopy);
894 kunmap_atomic(page, KM_USER0);
901 return X86EMUL_CONTINUE;
904 static int emulator_write_std(unsigned long addr,
907 struct x86_emulate_ctxt *ctxt)
909 printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
911 return X86EMUL_UNHANDLEABLE;
914 static int emulator_read_emulated(unsigned long addr,
917 struct x86_emulate_ctxt *ctxt)
919 struct kvm_vcpu *vcpu = ctxt->vcpu;
921 if (vcpu->mmio_read_completed) {
922 memcpy(val, vcpu->mmio_data, bytes);
923 vcpu->mmio_read_completed = 0;
924 return X86EMUL_CONTINUE;
925 } else if (emulator_read_std(addr, val, bytes, ctxt)
927 return X86EMUL_CONTINUE;
929 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
931 if (gpa == UNMAPPED_GVA)
932 return X86EMUL_PROPAGATE_FAULT;
933 vcpu->mmio_needed = 1;
934 vcpu->mmio_phys_addr = gpa;
935 vcpu->mmio_size = bytes;
936 vcpu->mmio_is_write = 0;
938 return X86EMUL_UNHANDLEABLE;
942 static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
943 unsigned long val, int bytes)
945 struct kvm_memory_slot *m;
949 if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
951 m = gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT);
954 page = gfn_to_page(m, gpa >> PAGE_SHIFT);
955 kvm_mmu_pre_write(vcpu, gpa, bytes);
956 virt = kmap_atomic(page, KM_USER0);
957 memcpy(virt + offset_in_page(gpa), &val, bytes);
958 kunmap_atomic(virt, KM_USER0);
959 kvm_mmu_post_write(vcpu, gpa, bytes);
963 static int emulator_write_emulated(unsigned long addr,
966 struct x86_emulate_ctxt *ctxt)
968 struct kvm_vcpu *vcpu = ctxt->vcpu;
969 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
971 if (gpa == UNMAPPED_GVA)
972 return X86EMUL_PROPAGATE_FAULT;
974 if (emulator_write_phys(vcpu, gpa, val, bytes))
975 return X86EMUL_CONTINUE;
977 vcpu->mmio_needed = 1;
978 vcpu->mmio_phys_addr = gpa;
979 vcpu->mmio_size = bytes;
980 vcpu->mmio_is_write = 1;
981 memcpy(vcpu->mmio_data, &val, bytes);
983 return X86EMUL_CONTINUE;
986 static int emulator_cmpxchg_emulated(unsigned long addr,
990 struct x86_emulate_ctxt *ctxt)
996 printk(KERN_WARNING "kvm: emulating exchange as write\n");
998 return emulator_write_emulated(addr, new, bytes, ctxt);
1001 #ifdef CONFIG_X86_32
1003 static int emulator_cmpxchg8b_emulated(unsigned long addr,
1004 unsigned long old_lo,
1005 unsigned long old_hi,
1006 unsigned long new_lo,
1007 unsigned long new_hi,
1008 struct x86_emulate_ctxt *ctxt)
1010 static int reported;
1015 printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
1017 r = emulator_write_emulated(addr, new_lo, 4, ctxt);
1018 if (r != X86EMUL_CONTINUE)
1020 return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
1025 static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
1027 return kvm_arch_ops->get_segment_base(vcpu, seg);
1030 int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
1032 return X86EMUL_CONTINUE;
1035 int emulate_clts(struct kvm_vcpu *vcpu)
1039 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1040 cr0 = vcpu->cr0 & ~CR0_TS_MASK;
1041 kvm_arch_ops->set_cr0(vcpu, cr0);
1042 return X86EMUL_CONTINUE;
1045 int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
1047 struct kvm_vcpu *vcpu = ctxt->vcpu;
1051 *dest = kvm_arch_ops->get_dr(vcpu, dr);
1052 return X86EMUL_CONTINUE;
1054 printk(KERN_DEBUG "%s: unexpected dr %u\n",
1056 return X86EMUL_UNHANDLEABLE;
1060 int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
1062 unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
1065 kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
1067 /* FIXME: better handling */
1068 return X86EMUL_UNHANDLEABLE;
1070 return X86EMUL_CONTINUE;
1073 static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
1075 static int reported;
1077 unsigned long rip = ctxt->vcpu->rip;
1078 unsigned long rip_linear;
1080 rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);
1085 emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);
1087 printk(KERN_ERR "emulation failed but !mmio_needed?"
1088 " rip %lx %02x %02x %02x %02x\n",
1089 rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
1093 struct x86_emulate_ops emulate_ops = {
1094 .read_std = emulator_read_std,
1095 .write_std = emulator_write_std,
1096 .read_emulated = emulator_read_emulated,
1097 .write_emulated = emulator_write_emulated,
1098 .cmpxchg_emulated = emulator_cmpxchg_emulated,
1099 #ifdef CONFIG_X86_32
1100 .cmpxchg8b_emulated = emulator_cmpxchg8b_emulated,
1104 int emulate_instruction(struct kvm_vcpu *vcpu,
1105 struct kvm_run *run,
1109 struct x86_emulate_ctxt emulate_ctxt;
1113 kvm_arch_ops->cache_regs(vcpu);
1115 kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
1117 emulate_ctxt.vcpu = vcpu;
1118 emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
1119 emulate_ctxt.cr2 = cr2;
1120 emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
1121 ? X86EMUL_MODE_REAL : cs_l
1122 ? X86EMUL_MODE_PROT64 : cs_db
1123 ? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;
1125 if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
1126 emulate_ctxt.cs_base = 0;
1127 emulate_ctxt.ds_base = 0;
1128 emulate_ctxt.es_base = 0;
1129 emulate_ctxt.ss_base = 0;
1131 emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
1132 emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
1133 emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
1134 emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
1137 emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
1138 emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);
1140 vcpu->mmio_is_write = 0;
1141 r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);
1143 if ((r || vcpu->mmio_is_write) && run) {
1144 run->mmio.phys_addr = vcpu->mmio_phys_addr;
1145 memcpy(run->mmio.data, vcpu->mmio_data, 8);
1146 run->mmio.len = vcpu->mmio_size;
1147 run->mmio.is_write = vcpu->mmio_is_write;
1151 if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
1152 return EMULATE_DONE;
1153 if (!vcpu->mmio_needed) {
1154 report_emulation_failure(&emulate_ctxt);
1155 return EMULATE_FAIL;
1157 return EMULATE_DO_MMIO;
1160 kvm_arch_ops->decache_regs(vcpu);
1161 kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);
1163 if (vcpu->mmio_is_write)
1164 return EMULATE_DO_MMIO;
1166 return EMULATE_DONE;
1168 EXPORT_SYMBOL_GPL(emulate_instruction);
1170 int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
1172 unsigned long nr, a0, a1, a2, a3, a4, a5, ret;
1174 kvm_arch_ops->decache_regs(vcpu);
1176 #ifdef CONFIG_X86_64
1177 if (is_long_mode(vcpu)) {
1178 nr = vcpu->regs[VCPU_REGS_RAX];
1179 a0 = vcpu->regs[VCPU_REGS_RDI];
1180 a1 = vcpu->regs[VCPU_REGS_RSI];
1181 a2 = vcpu->regs[VCPU_REGS_RDX];
1182 a3 = vcpu->regs[VCPU_REGS_RCX];
1183 a4 = vcpu->regs[VCPU_REGS_R8];
1184 a5 = vcpu->regs[VCPU_REGS_R9];
1188 nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
1189 a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
1190 a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
1191 a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
1192 a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
1193 a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
1194 a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
1200 vcpu->regs[VCPU_REGS_RAX] = ret;
1201 kvm_arch_ops->cache_regs(vcpu);
1204 EXPORT_SYMBOL_GPL(kvm_hypercall);
1206 static u64 mk_cr_64(u64 curr_cr, u32 new_val)
1208 return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
1211 void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1213 struct descriptor_table dt = { limit, base };
1215 kvm_arch_ops->set_gdt(vcpu, &dt);
1218 void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
1220 struct descriptor_table dt = { limit, base };
1222 kvm_arch_ops->set_idt(vcpu, &dt);
1225 void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
1226 unsigned long *rflags)
1229 *rflags = kvm_arch_ops->get_rflags(vcpu);
1232 unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
1234 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1245 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1250 void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
1251 unsigned long *rflags)
1255 set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
1256 *rflags = kvm_arch_ops->get_rflags(vcpu);
1265 set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
1268 vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
1273 * Register the para guest with the host:
1275 static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
1277 struct kvm_vcpu_para_state *para_state;
1278 hpa_t para_state_hpa, hypercall_hpa;
1279 struct page *para_state_page;
1280 unsigned char *hypercall;
1281 gpa_t hypercall_gpa;
1283 printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
1284 printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);
1287 * Needs to be page aligned:
1289 if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
1292 para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
1293 printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
1294 if (is_error_hpa(para_state_hpa))
1297 para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
1298 para_state = kmap_atomic(para_state_page, KM_USER0);
1300 printk(KERN_DEBUG ".... guest version: %d\n", para_state->guest_version);
1301 printk(KERN_DEBUG ".... size: %d\n", para_state->size);
1303 para_state->host_version = KVM_PARA_API_VERSION;
1305 * We cannot support guests that try to register themselves
1306 * with a newer API version than the host supports:
1308 if (para_state->guest_version > KVM_PARA_API_VERSION) {
1309 para_state->ret = -KVM_EINVAL;
1310 goto err_kunmap_skip;
1313 hypercall_gpa = para_state->hypercall_gpa;
1314 hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
1315 printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
1316 if (is_error_hpa(hypercall_hpa)) {
1317 para_state->ret = -KVM_EINVAL;
1318 goto err_kunmap_skip;
1321 printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
1322 vcpu->para_state_page = para_state_page;
1323 vcpu->para_state_gpa = para_state_gpa;
1324 vcpu->hypercall_gpa = hypercall_gpa;
1326 hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
1327 KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
1328 kvm_arch_ops->patch_hypercall(vcpu, hypercall);
1329 kunmap_atomic(hypercall, KM_USER1);
1331 para_state->ret = 0;
1333 kunmap_atomic(para_state, KM_USER0);
1339 int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
1344 case 0xc0010010: /* SYSCFG */
1345 case 0xc0010015: /* HWCR */
1346 case MSR_IA32_PLATFORM_ID:
1347 case MSR_IA32_P5_MC_ADDR:
1348 case MSR_IA32_P5_MC_TYPE:
1349 case MSR_IA32_MC0_CTL:
1350 case MSR_IA32_MCG_STATUS:
1351 case MSR_IA32_MCG_CAP:
1352 case MSR_IA32_MC0_MISC:
1353 case MSR_IA32_MC0_MISC+4:
1354 case MSR_IA32_MC0_MISC+8:
1355 case MSR_IA32_MC0_MISC+12:
1356 case MSR_IA32_MC0_MISC+16:
1357 case MSR_IA32_UCODE_REV:
1358 case MSR_IA32_PERF_STATUS:
1359 /* MTRR registers */
1361 case 0x200 ... 0x2ff:
1364 case 0xcd: /* fsb frequency */
1367 case MSR_IA32_APICBASE:
1368 data = vcpu->apic_base;
1370 case MSR_IA32_MISC_ENABLE:
1371 data = vcpu->ia32_misc_enable_msr;
1373 #ifdef CONFIG_X86_64
1375 data = vcpu->shadow_efer;
1379 printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
1385 EXPORT_SYMBOL_GPL(kvm_get_msr_common);
1388 * Reads an msr value (of 'msr_index') into 'pdata'.
1389 * Returns 0 on success, non-0 otherwise.
1390 * Assumes vcpu_load() was already called.
1392 static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
1394 return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
1397 #ifdef CONFIG_X86_64
1399 static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
1401 if (efer & EFER_RESERVED_BITS) {
1402 printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
1409 && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
1410 printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
1415 kvm_arch_ops->set_efer(vcpu, efer);
1418 efer |= vcpu->shadow_efer & EFER_LMA;
1420 vcpu->shadow_efer = efer;
1425 int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
1428 #ifdef CONFIG_X86_64
1430 set_efer(vcpu, data);
1433 case MSR_IA32_MC0_STATUS:
1434 printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
1435 __FUNCTION__, data);
1437 case MSR_IA32_UCODE_REV:
1438 case MSR_IA32_UCODE_WRITE:
1439 case 0x200 ... 0x2ff: /* MTRRs */
1441 case MSR_IA32_APICBASE:
1442 vcpu->apic_base = data;
1444 case MSR_IA32_MISC_ENABLE:
1445 vcpu->ia32_misc_enable_msr = data;
1448 * This is the 'probe whether the host is KVM' logic:
1450 case MSR_KVM_API_MAGIC:
1451 return vcpu_register_para(vcpu, data);
1454 printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
1459 EXPORT_SYMBOL_GPL(kvm_set_msr_common);
1462 * Writes msr value into into the appropriate "register".
1463 * Returns 0 on success, non-0 otherwise.
1464 * Assumes vcpu_load() was already called.
1466 static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
1468 return kvm_arch_ops->set_msr(vcpu, msr_index, data);
1471 void kvm_resched(struct kvm_vcpu *vcpu)
1477 EXPORT_SYMBOL_GPL(kvm_resched);
1479 void load_msrs(struct vmx_msr_entry *e, int n)
1483 for (i = 0; i < n; ++i)
1484 wrmsrl(e[i].index, e[i].data);
1486 EXPORT_SYMBOL_GPL(load_msrs);
1488 void save_msrs(struct vmx_msr_entry *e, int n)
1492 for (i = 0; i < n; ++i)
1493 rdmsrl(e[i].index, e[i].data);
1495 EXPORT_SYMBOL_GPL(save_msrs);
1497 static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
1503 /* re-sync apic's tpr */
1504 vcpu->cr8 = kvm_run->cr8;
1506 if (kvm_run->emulated) {
1507 kvm_arch_ops->skip_emulated_instruction(vcpu);
1508 kvm_run->emulated = 0;
1511 if (kvm_run->mmio_completed) {
1512 memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
1513 vcpu->mmio_read_completed = 1;
1516 vcpu->mmio_needed = 0;
1518 r = kvm_arch_ops->run(vcpu, kvm_run);
1524 static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
1525 struct kvm_regs *regs)
1529 kvm_arch_ops->cache_regs(vcpu);
1531 regs->rax = vcpu->regs[VCPU_REGS_RAX];
1532 regs->rbx = vcpu->regs[VCPU_REGS_RBX];
1533 regs->rcx = vcpu->regs[VCPU_REGS_RCX];
1534 regs->rdx = vcpu->regs[VCPU_REGS_RDX];
1535 regs->rsi = vcpu->regs[VCPU_REGS_RSI];
1536 regs->rdi = vcpu->regs[VCPU_REGS_RDI];
1537 regs->rsp = vcpu->regs[VCPU_REGS_RSP];
1538 regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1539 #ifdef CONFIG_X86_64
1540 regs->r8 = vcpu->regs[VCPU_REGS_R8];
1541 regs->r9 = vcpu->regs[VCPU_REGS_R9];
1542 regs->r10 = vcpu->regs[VCPU_REGS_R10];
1543 regs->r11 = vcpu->regs[VCPU_REGS_R11];
1544 regs->r12 = vcpu->regs[VCPU_REGS_R12];
1545 regs->r13 = vcpu->regs[VCPU_REGS_R13];
1546 regs->r14 = vcpu->regs[VCPU_REGS_R14];
1547 regs->r15 = vcpu->regs[VCPU_REGS_R15];
1550 regs->rip = vcpu->rip;
1551 regs->rflags = kvm_arch_ops->get_rflags(vcpu);
1554 * Don't leak debug flags in case they were set for guest debugging
1556 if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
1557 regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
1564 static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
1565 struct kvm_regs *regs)
1569 vcpu->regs[VCPU_REGS_RAX] = regs->rax;
1570 vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
1571 vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
1572 vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
1573 vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
1574 vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
1575 vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
1576 vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1577 #ifdef CONFIG_X86_64
1578 vcpu->regs[VCPU_REGS_R8] = regs->r8;
1579 vcpu->regs[VCPU_REGS_R9] = regs->r9;
1580 vcpu->regs[VCPU_REGS_R10] = regs->r10;
1581 vcpu->regs[VCPU_REGS_R11] = regs->r11;
1582 vcpu->regs[VCPU_REGS_R12] = regs->r12;
1583 vcpu->regs[VCPU_REGS_R13] = regs->r13;
1584 vcpu->regs[VCPU_REGS_R14] = regs->r14;
1585 vcpu->regs[VCPU_REGS_R15] = regs->r15;
1588 vcpu->rip = regs->rip;
1589 kvm_arch_ops->set_rflags(vcpu, regs->rflags);
1591 kvm_arch_ops->decache_regs(vcpu);
1598 static void get_segment(struct kvm_vcpu *vcpu,
1599 struct kvm_segment *var, int seg)
1601 return kvm_arch_ops->get_segment(vcpu, var, seg);
1604 static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
1605 struct kvm_sregs *sregs)
1607 struct descriptor_table dt;
1611 get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1612 get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1613 get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1614 get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1615 get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1616 get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1618 get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1619 get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1621 kvm_arch_ops->get_idt(vcpu, &dt);
1622 sregs->idt.limit = dt.limit;
1623 sregs->idt.base = dt.base;
1624 kvm_arch_ops->get_gdt(vcpu, &dt);
1625 sregs->gdt.limit = dt.limit;
1626 sregs->gdt.base = dt.base;
1628 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1629 sregs->cr0 = vcpu->cr0;
1630 sregs->cr2 = vcpu->cr2;
1631 sregs->cr3 = vcpu->cr3;
1632 sregs->cr4 = vcpu->cr4;
1633 sregs->cr8 = vcpu->cr8;
1634 sregs->efer = vcpu->shadow_efer;
1635 sregs->apic_base = vcpu->apic_base;
1637 memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
1638 sizeof sregs->interrupt_bitmap);
1645 static void set_segment(struct kvm_vcpu *vcpu,
1646 struct kvm_segment *var, int seg)
1648 return kvm_arch_ops->set_segment(vcpu, var, seg);
1651 static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
1652 struct kvm_sregs *sregs)
1654 int mmu_reset_needed = 0;
1656 struct descriptor_table dt;
1660 set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
1661 set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
1662 set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
1663 set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
1664 set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
1665 set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
1667 set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
1668 set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
1670 dt.limit = sregs->idt.limit;
1671 dt.base = sregs->idt.base;
1672 kvm_arch_ops->set_idt(vcpu, &dt);
1673 dt.limit = sregs->gdt.limit;
1674 dt.base = sregs->gdt.base;
1675 kvm_arch_ops->set_gdt(vcpu, &dt);
1677 vcpu->cr2 = sregs->cr2;
1678 mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
1679 vcpu->cr3 = sregs->cr3;
1681 vcpu->cr8 = sregs->cr8;
1683 mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
1684 #ifdef CONFIG_X86_64
1685 kvm_arch_ops->set_efer(vcpu, sregs->efer);
1687 vcpu->apic_base = sregs->apic_base;
1689 kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
1691 mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
1692 kvm_arch_ops->set_cr0_no_modeswitch(vcpu, sregs->cr0);
1694 mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
1695 kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
1696 if (!is_long_mode(vcpu) && is_pae(vcpu))
1697 load_pdptrs(vcpu, vcpu->cr3);
1699 if (mmu_reset_needed)
1700 kvm_mmu_reset_context(vcpu);
1702 memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
1703 sizeof vcpu->irq_pending);
1704 vcpu->irq_summary = 0;
1705 for (i = 0; i < NR_IRQ_WORDS; ++i)
1706 if (vcpu->irq_pending[i])
1707 __set_bit(i, &vcpu->irq_summary);
1715 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
1716 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
1718 * This list is modified at module load time to reflect the
1719 * capabilities of the host cpu.
1721 static u32 msrs_to_save[] = {
1722 MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
1724 #ifdef CONFIG_X86_64
1725 MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
1727 MSR_IA32_TIME_STAMP_COUNTER,
1730 static unsigned num_msrs_to_save;
1732 static u32 emulated_msrs[] = {
1733 MSR_IA32_MISC_ENABLE,
1736 static __init void kvm_init_msr_list(void)
1741 for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
1742 if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
1745 msrs_to_save[j] = msrs_to_save[i];
1748 num_msrs_to_save = j;
1752 * Adapt set_msr() to msr_io()'s calling convention
1754 static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
1756 return set_msr(vcpu, index, *data);
1760 * Read or write a bunch of msrs. All parameters are kernel addresses.
1762 * @return number of msrs set successfully.
1764 static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
1765 struct kvm_msr_entry *entries,
1766 int (*do_msr)(struct kvm_vcpu *vcpu,
1767 unsigned index, u64 *data))
1773 for (i = 0; i < msrs->nmsrs; ++i)
1774 if (do_msr(vcpu, entries[i].index, &entries[i].data))
1783 * Read or write a bunch of msrs. Parameters are user addresses.
1785 * @return number of msrs set successfully.
1787 static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
1788 int (*do_msr)(struct kvm_vcpu *vcpu,
1789 unsigned index, u64 *data),
1792 struct kvm_msrs msrs;
1793 struct kvm_msr_entry *entries;
1798 if (copy_from_user(&msrs, user_msrs, sizeof msrs))
1802 if (msrs.nmsrs >= MAX_IO_MSRS)
1806 size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
1807 entries = vmalloc(size);
1812 if (copy_from_user(entries, user_msrs->entries, size))
1815 r = n = __msr_io(vcpu, &msrs, entries, do_msr);
1820 if (writeback && copy_to_user(user_msrs->entries, entries, size))
1832 * Translate a guest virtual address to a guest physical address.
1834 static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
1835 struct kvm_translation *tr)
1837 unsigned long vaddr = tr->linear_address;
1841 spin_lock(&vcpu->kvm->lock);
1842 gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
1843 tr->physical_address = gpa;
1844 tr->valid = gpa != UNMAPPED_GVA;
1847 spin_unlock(&vcpu->kvm->lock);
1853 static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
1854 struct kvm_interrupt *irq)
1856 if (irq->irq < 0 || irq->irq >= 256)
1860 set_bit(irq->irq, vcpu->irq_pending);
1861 set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);
1868 static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
1869 struct kvm_debug_guest *dbg)
1875 r = kvm_arch_ops->set_guest_debug(vcpu, dbg);
1882 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1884 struct kvm_vcpu *vcpu = filp->private_data;
1886 fput(vcpu->kvm->filp);
1890 static struct file_operations kvm_vcpu_fops = {
1891 .release = kvm_vcpu_release,
1892 .unlocked_ioctl = kvm_vcpu_ioctl,
1893 .compat_ioctl = kvm_vcpu_ioctl,
1897 * Allocates an inode for the vcpu.
1899 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1902 struct inode *inode;
1905 atomic_inc(&vcpu->kvm->filp->f_count);
1906 inode = kvmfs_inode(&kvm_vcpu_fops);
1907 if (IS_ERR(inode)) {
1912 file = kvmfs_file(inode, vcpu);
1918 r = get_unused_fd();
1922 fd_install(fd, file);
1931 fput(vcpu->kvm->filp);
1936 * Creates some virtual cpus. Good luck creating more than one.
1938 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1941 struct kvm_vcpu *vcpu;
1947 vcpu = &kvm->vcpus[n];
1949 mutex_lock(&vcpu->mutex);
1952 mutex_unlock(&vcpu->mutex);
1956 vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
1958 vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
1960 r = kvm_arch_ops->vcpu_create(vcpu);
1962 goto out_free_vcpus;
1964 r = kvm_mmu_create(vcpu);
1966 goto out_free_vcpus;
1968 kvm_arch_ops->vcpu_load(vcpu);
1969 r = kvm_mmu_setup(vcpu);
1971 r = kvm_arch_ops->vcpu_setup(vcpu);
1975 goto out_free_vcpus;
1977 r = create_vcpu_fd(vcpu);
1979 goto out_free_vcpus;
1984 kvm_free_vcpu(vcpu);
1985 mutex_unlock(&vcpu->mutex);
1990 static long kvm_vcpu_ioctl(struct file *filp,
1991 unsigned int ioctl, unsigned long arg)
1993 struct kvm_vcpu *vcpu = filp->private_data;
1994 void __user *argp = (void __user *)arg;
1999 struct kvm_run kvm_run;
2002 if (copy_from_user(&kvm_run, argp, sizeof kvm_run))
2004 r = kvm_vcpu_ioctl_run(vcpu, &kvm_run);
2005 if (r < 0 && r != -EINTR)
2007 if (copy_to_user(argp, &kvm_run, sizeof kvm_run)) {
2013 case KVM_GET_REGS: {
2014 struct kvm_regs kvm_regs;
2016 memset(&kvm_regs, 0, sizeof kvm_regs);
2017 r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
2021 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
2026 case KVM_SET_REGS: {
2027 struct kvm_regs kvm_regs;
2030 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
2032 r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
2038 case KVM_GET_SREGS: {
2039 struct kvm_sregs kvm_sregs;
2041 memset(&kvm_sregs, 0, sizeof kvm_sregs);
2042 r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
2046 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
2051 case KVM_SET_SREGS: {
2052 struct kvm_sregs kvm_sregs;
2055 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
2057 r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
2063 case KVM_TRANSLATE: {
2064 struct kvm_translation tr;
2067 if (copy_from_user(&tr, argp, sizeof tr))
2069 r = kvm_vcpu_ioctl_translate(vcpu, &tr);
2073 if (copy_to_user(argp, &tr, sizeof tr))
2078 case KVM_INTERRUPT: {
2079 struct kvm_interrupt irq;
2082 if (copy_from_user(&irq, argp, sizeof irq))
2084 r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
2090 case KVM_DEBUG_GUEST: {
2091 struct kvm_debug_guest dbg;
2094 if (copy_from_user(&dbg, argp, sizeof dbg))
2096 r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
2103 r = msr_io(vcpu, argp, get_msr, 1);
2106 r = msr_io(vcpu, argp, do_set_msr, 0);
2115 static long kvm_vm_ioctl(struct file *filp,
2116 unsigned int ioctl, unsigned long arg)
2118 struct kvm *kvm = filp->private_data;
2119 void __user *argp = (void __user *)arg;
2123 case KVM_CREATE_VCPU:
2124 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2128 case KVM_SET_MEMORY_REGION: {
2129 struct kvm_memory_region kvm_mem;
2132 if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
2134 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
2139 case KVM_GET_DIRTY_LOG: {
2140 struct kvm_dirty_log log;
2143 if (copy_from_user(&log, argp, sizeof log))
2145 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2157 static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
2158 unsigned long address,
2161 struct kvm *kvm = vma->vm_file->private_data;
2162 unsigned long pgoff;
2163 struct kvm_memory_slot *slot;
2166 *type = VM_FAULT_MINOR;
2167 pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2168 slot = gfn_to_memslot(kvm, pgoff);
2170 return NOPAGE_SIGBUS;
2171 page = gfn_to_page(slot, pgoff);
2173 return NOPAGE_SIGBUS;
2178 static struct vm_operations_struct kvm_vm_vm_ops = {
2179 .nopage = kvm_vm_nopage,
2182 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2184 vma->vm_ops = &kvm_vm_vm_ops;
2188 static struct file_operations kvm_vm_fops = {
2189 .release = kvm_vm_release,
2190 .unlocked_ioctl = kvm_vm_ioctl,
2191 .compat_ioctl = kvm_vm_ioctl,
2192 .mmap = kvm_vm_mmap,
2195 static int kvm_dev_ioctl_create_vm(void)
2198 struct inode *inode;
2202 inode = kvmfs_inode(&kvm_vm_fops);
2203 if (IS_ERR(inode)) {
2208 kvm = kvm_create_vm();
2214 file = kvmfs_file(inode, kvm);
2221 r = get_unused_fd();
2225 fd_install(fd, file);
2232 kvm_destroy_vm(kvm);
2239 static long kvm_dev_ioctl(struct file *filp,
2240 unsigned int ioctl, unsigned long arg)
2242 void __user *argp = (void __user *)arg;
2246 case KVM_GET_API_VERSION:
2247 r = KVM_API_VERSION;
2250 r = kvm_dev_ioctl_create_vm();
2252 case KVM_GET_MSR_INDEX_LIST: {
2253 struct kvm_msr_list __user *user_msr_list = argp;
2254 struct kvm_msr_list msr_list;
2258 if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
2261 msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
2262 if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
2265 if (n < num_msrs_to_save)
2268 if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2269 num_msrs_to_save * sizeof(u32)))
2271 if (copy_to_user(user_msr_list->indices
2272 + num_msrs_to_save * sizeof(u32),
2274 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
2286 static struct file_operations kvm_chardev_ops = {
2287 .open = kvm_dev_open,
2288 .release = kvm_dev_release,
2289 .unlocked_ioctl = kvm_dev_ioctl,
2290 .compat_ioctl = kvm_dev_ioctl,
2293 static struct miscdevice kvm_dev = {
2299 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2302 if (val == SYS_RESTART) {
2304 * Some (well, at least mine) BIOSes hang on reboot if
2307 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2308 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2313 static struct notifier_block kvm_reboot_notifier = {
2314 .notifier_call = kvm_reboot,
2319 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
2322 static void decache_vcpus_on_cpu(int cpu)
2325 struct kvm_vcpu *vcpu;
2328 spin_lock(&kvm_lock);
2329 list_for_each_entry(vm, &vm_list, vm_list)
2330 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2331 vcpu = &vm->vcpus[i];
2333 * If the vcpu is locked, then it is running on some
2334 * other cpu and therefore it is not cached on the
2337 * If it's not locked, check the last cpu it executed
2340 if (mutex_trylock(&vcpu->mutex)) {
2341 if (vcpu->cpu == cpu) {
2342 kvm_arch_ops->vcpu_decache(vcpu);
2345 mutex_unlock(&vcpu->mutex);
2348 spin_unlock(&kvm_lock);
2351 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2357 case CPU_DOWN_PREPARE:
2358 case CPU_UP_CANCELED:
2359 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2361 decache_vcpus_on_cpu(cpu);
2362 smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
2366 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2368 smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
2375 static struct notifier_block kvm_cpu_notifier = {
2376 .notifier_call = kvm_cpu_hotplug,
2377 .priority = 20, /* must be > scheduler priority */
2380 static __init void kvm_init_debug(void)
2382 struct kvm_stats_debugfs_item *p;
2384 debugfs_dir = debugfs_create_dir("kvm", NULL);
2385 for (p = debugfs_entries; p->name; ++p)
2386 p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
2390 static void kvm_exit_debug(void)
2392 struct kvm_stats_debugfs_item *p;
2394 for (p = debugfs_entries; p->name; ++p)
2395 debugfs_remove(p->dentry);
2396 debugfs_remove(debugfs_dir);
2399 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2401 decache_vcpus_on_cpu(raw_smp_processor_id());
2402 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2406 static int kvm_resume(struct sys_device *dev)
2408 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2412 static struct sysdev_class kvm_sysdev_class = {
2413 set_kset_name("kvm"),
2414 .suspend = kvm_suspend,
2415 .resume = kvm_resume,
2418 static struct sys_device kvm_sysdev = {
2420 .cls = &kvm_sysdev_class,
2423 hpa_t bad_page_address;
2425 static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
2426 const char *dev_name, void *data, struct vfsmount *mnt)
2428 return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_MAGIC, mnt);
2431 static struct file_system_type kvm_fs_type = {
2433 .get_sb = kvmfs_get_sb,
2434 .kill_sb = kill_anon_super,
2437 int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
2442 printk(KERN_ERR "kvm: already loaded the other module\n");
2446 if (!ops->cpu_has_kvm_support()) {
2447 printk(KERN_ERR "kvm: no hardware support\n");
2450 if (ops->disabled_by_bios()) {
2451 printk(KERN_ERR "kvm: disabled by bios\n");
2457 r = kvm_arch_ops->hardware_setup();
2461 on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2462 r = register_cpu_notifier(&kvm_cpu_notifier);
2465 register_reboot_notifier(&kvm_reboot_notifier);
2467 r = sysdev_class_register(&kvm_sysdev_class);
2471 r = sysdev_register(&kvm_sysdev);
2475 kvm_chardev_ops.owner = module;
2477 r = misc_register(&kvm_dev);
2479 printk (KERN_ERR "kvm: misc device register failed\n");
2486 sysdev_unregister(&kvm_sysdev);
2488 sysdev_class_unregister(&kvm_sysdev_class);
2490 unregister_reboot_notifier(&kvm_reboot_notifier);
2491 unregister_cpu_notifier(&kvm_cpu_notifier);
2493 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2494 kvm_arch_ops->hardware_unsetup();
2498 void kvm_exit_arch(void)
2500 misc_deregister(&kvm_dev);
2501 sysdev_unregister(&kvm_sysdev);
2502 sysdev_class_unregister(&kvm_sysdev_class);
2503 unregister_reboot_notifier(&kvm_reboot_notifier);
2504 unregister_cpu_notifier(&kvm_cpu_notifier);
2505 on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2506 kvm_arch_ops->hardware_unsetup();
2507 kvm_arch_ops = NULL;
2510 static __init int kvm_init(void)
2512 static struct page *bad_page;
2515 r = register_filesystem(&kvm_fs_type);
2519 kvmfs_mnt = kern_mount(&kvm_fs_type);
2520 r = PTR_ERR(kvmfs_mnt);
2521 if (IS_ERR(kvmfs_mnt))
2525 kvm_init_msr_list();
2527 if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
2532 bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
2533 memset(__va(bad_page_address), 0, PAGE_SIZE);
2541 unregister_filesystem(&kvm_fs_type);
2546 static __exit void kvm_exit(void)
2549 __free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
2551 unregister_filesystem(&kvm_fs_type);
2554 module_init(kvm_init)
2555 module_exit(kvm_exit)
2557 EXPORT_SYMBOL_GPL(kvm_init_arch);
2558 EXPORT_SYMBOL_GPL(kvm_exit_arch);