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_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
44 #include <asm/processor.h>
46 #include <asm/uaccess.h>
47 #include <asm/pgtable.h>
49 MODULE_AUTHOR("Qumranet");
50 MODULE_LICENSE("GPL");
52 DEFINE_SPINLOCK(kvm_lock);
55 static cpumask_t cpus_hardware_enabled;
57 struct kmem_cache *kvm_vcpu_cache;
58 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
60 static __read_mostly struct preempt_ops kvm_preempt_ops;
62 static struct dentry *debugfs_dir;
64 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
67 static inline int valid_vcpu(int n)
69 return likely(n >= 0 && n < KVM_MAX_VCPUS);
73 * Switches to specified vcpu, until a matching vcpu_put()
75 void vcpu_load(struct kvm_vcpu *vcpu)
79 mutex_lock(&vcpu->mutex);
81 preempt_notifier_register(&vcpu->preempt_notifier);
82 kvm_arch_vcpu_load(vcpu, cpu);
86 void vcpu_put(struct kvm_vcpu *vcpu)
89 kvm_arch_vcpu_put(vcpu);
90 preempt_notifier_unregister(&vcpu->preempt_notifier);
92 mutex_unlock(&vcpu->mutex);
95 static void ack_flush(void *_completed)
99 void kvm_flush_remote_tlbs(struct kvm *kvm)
103 struct kvm_vcpu *vcpu;
106 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
107 vcpu = kvm->vcpus[i];
110 if (test_and_set_bit(KVM_REQ_TLB_FLUSH, &vcpu->requests))
113 if (cpu != -1 && cpu != raw_smp_processor_id())
116 if (cpus_empty(cpus))
118 ++kvm->stat.remote_tlb_flush;
119 smp_call_function_mask(cpus, ack_flush, NULL, 1);
122 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
127 mutex_init(&vcpu->mutex);
131 init_waitqueue_head(&vcpu->wq);
133 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
138 vcpu->run = page_address(page);
140 r = kvm_arch_vcpu_init(vcpu);
146 free_page((unsigned long)vcpu->run);
150 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
152 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
154 kvm_arch_vcpu_uninit(vcpu);
155 free_page((unsigned long)vcpu->run);
157 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
159 static struct kvm *kvm_create_vm(void)
161 struct kvm *kvm = kvm_arch_create_vm();
166 kvm->mm = current->mm;
167 atomic_inc(&kvm->mm->mm_count);
168 spin_lock_init(&kvm->mmu_lock);
169 kvm_io_bus_init(&kvm->pio_bus);
170 mutex_init(&kvm->lock);
171 kvm_io_bus_init(&kvm->mmio_bus);
172 spin_lock(&kvm_lock);
173 list_add(&kvm->vm_list, &vm_list);
174 spin_unlock(&kvm_lock);
180 * Free any memory in @free but not in @dont.
182 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
183 struct kvm_memory_slot *dont)
185 if (!dont || free->rmap != dont->rmap)
188 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
189 vfree(free->dirty_bitmap);
192 free->dirty_bitmap = NULL;
196 void kvm_free_physmem(struct kvm *kvm)
200 for (i = 0; i < kvm->nmemslots; ++i)
201 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
204 static void kvm_destroy_vm(struct kvm *kvm)
206 struct mm_struct *mm = kvm->mm;
208 spin_lock(&kvm_lock);
209 list_del(&kvm->vm_list);
210 spin_unlock(&kvm_lock);
211 kvm_io_bus_destroy(&kvm->pio_bus);
212 kvm_io_bus_destroy(&kvm->mmio_bus);
213 kvm_arch_destroy_vm(kvm);
217 static int kvm_vm_release(struct inode *inode, struct file *filp)
219 struct kvm *kvm = filp->private_data;
226 * Allocate some memory and give it an address in the guest physical address
229 * Discontiguous memory is allowed, mostly for framebuffers.
231 * Must be called holding mmap_sem for write.
233 int __kvm_set_memory_region(struct kvm *kvm,
234 struct kvm_userspace_memory_region *mem,
239 unsigned long npages;
241 struct kvm_memory_slot *memslot;
242 struct kvm_memory_slot old, new;
245 /* General sanity checks */
246 if (mem->memory_size & (PAGE_SIZE - 1))
248 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
250 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
252 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
255 memslot = &kvm->memslots[mem->slot];
256 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
257 npages = mem->memory_size >> PAGE_SHIFT;
260 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
262 new = old = *memslot;
264 new.base_gfn = base_gfn;
266 new.flags = mem->flags;
268 /* Disallow changing a memory slot's size. */
270 if (npages && old.npages && npages != old.npages)
273 /* Check for overlaps */
275 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
276 struct kvm_memory_slot *s = &kvm->memslots[i];
280 if (!((base_gfn + npages <= s->base_gfn) ||
281 (base_gfn >= s->base_gfn + s->npages)))
285 /* Free page dirty bitmap if unneeded */
286 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
287 new.dirty_bitmap = NULL;
291 /* Allocate if a slot is being created */
292 if (npages && !new.rmap) {
293 new.rmap = vmalloc(npages * sizeof(struct page *));
298 memset(new.rmap, 0, npages * sizeof(*new.rmap));
300 new.user_alloc = user_alloc;
301 new.userspace_addr = mem->userspace_addr;
304 /* Allocate page dirty bitmap if needed */
305 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
306 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
308 new.dirty_bitmap = vmalloc(dirty_bytes);
309 if (!new.dirty_bitmap)
311 memset(new.dirty_bitmap, 0, dirty_bytes);
314 if (mem->slot >= kvm->nmemslots)
315 kvm->nmemslots = mem->slot + 1;
319 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
325 kvm_free_physmem_slot(&old, &new);
329 kvm_free_physmem_slot(&new, &old);
334 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
336 int kvm_set_memory_region(struct kvm *kvm,
337 struct kvm_userspace_memory_region *mem,
342 down_write(¤t->mm->mmap_sem);
343 r = __kvm_set_memory_region(kvm, mem, user_alloc);
344 up_write(¤t->mm->mmap_sem);
347 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
349 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
351 kvm_userspace_memory_region *mem,
354 if (mem->slot >= KVM_MEMORY_SLOTS)
356 return kvm_set_memory_region(kvm, mem, user_alloc);
359 int kvm_get_dirty_log(struct kvm *kvm,
360 struct kvm_dirty_log *log, int *is_dirty)
362 struct kvm_memory_slot *memslot;
365 unsigned long any = 0;
368 if (log->slot >= KVM_MEMORY_SLOTS)
371 memslot = &kvm->memslots[log->slot];
373 if (!memslot->dirty_bitmap)
376 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
378 for (i = 0; !any && i < n/sizeof(long); ++i)
379 any = memslot->dirty_bitmap[i];
382 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
393 int is_error_page(struct page *page)
395 return page == bad_page;
397 EXPORT_SYMBOL_GPL(is_error_page);
399 static inline unsigned long bad_hva(void)
404 int kvm_is_error_hva(unsigned long addr)
406 return addr == bad_hva();
408 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
410 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
414 for (i = 0; i < kvm->nmemslots; ++i) {
415 struct kvm_memory_slot *memslot = &kvm->memslots[i];
417 if (gfn >= memslot->base_gfn
418 && gfn < memslot->base_gfn + memslot->npages)
424 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
426 gfn = unalias_gfn(kvm, gfn);
427 return __gfn_to_memslot(kvm, gfn);
430 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
434 gfn = unalias_gfn(kvm, gfn);
435 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
436 struct kvm_memory_slot *memslot = &kvm->memslots[i];
438 if (gfn >= memslot->base_gfn
439 && gfn < memslot->base_gfn + memslot->npages)
444 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
446 static unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
448 struct kvm_memory_slot *slot;
450 gfn = unalias_gfn(kvm, gfn);
451 slot = __gfn_to_memslot(kvm, gfn);
454 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
458 * Requires current->mm->mmap_sem to be held
460 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
462 struct page *page[1];
468 addr = gfn_to_hva(kvm, gfn);
469 if (kvm_is_error_hva(addr)) {
474 npages = get_user_pages(current, current->mm, addr, 1, 1, 1, page,
485 EXPORT_SYMBOL_GPL(gfn_to_page);
487 void kvm_release_page_clean(struct page *page)
491 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
493 void kvm_release_page_dirty(struct page *page)
495 if (!PageReserved(page))
499 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
501 static int next_segment(unsigned long len, int offset)
503 if (len > PAGE_SIZE - offset)
504 return PAGE_SIZE - offset;
509 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
515 addr = gfn_to_hva(kvm, gfn);
516 if (kvm_is_error_hva(addr))
518 r = copy_from_user(data, (void __user *)addr + offset, len);
523 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
525 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
527 gfn_t gfn = gpa >> PAGE_SHIFT;
529 int offset = offset_in_page(gpa);
532 while ((seg = next_segment(len, offset)) != 0) {
533 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
543 EXPORT_SYMBOL_GPL(kvm_read_guest);
545 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
550 gfn_t gfn = gpa >> PAGE_SHIFT;
551 int offset = offset_in_page(gpa);
553 addr = gfn_to_hva(kvm, gfn);
554 if (kvm_is_error_hva(addr))
556 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
561 EXPORT_SYMBOL(kvm_read_guest_atomic);
563 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
569 addr = gfn_to_hva(kvm, gfn);
570 if (kvm_is_error_hva(addr))
572 r = copy_to_user((void __user *)addr + offset, data, len);
575 mark_page_dirty(kvm, gfn);
578 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
580 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
583 gfn_t gfn = gpa >> PAGE_SHIFT;
585 int offset = offset_in_page(gpa);
588 while ((seg = next_segment(len, offset)) != 0) {
589 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
600 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
602 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
604 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
606 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
608 gfn_t gfn = gpa >> PAGE_SHIFT;
610 int offset = offset_in_page(gpa);
613 while ((seg = next_segment(len, offset)) != 0) {
614 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
623 EXPORT_SYMBOL_GPL(kvm_clear_guest);
625 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
627 struct kvm_memory_slot *memslot;
629 gfn = unalias_gfn(kvm, gfn);
630 memslot = __gfn_to_memslot(kvm, gfn);
631 if (memslot && memslot->dirty_bitmap) {
632 unsigned long rel_gfn = gfn - memslot->base_gfn;
635 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
636 set_bit(rel_gfn, memslot->dirty_bitmap);
641 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
643 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
645 DECLARE_WAITQUEUE(wait, current);
647 add_wait_queue(&vcpu->wq, &wait);
650 * We will block until either an interrupt or a signal wakes us up
652 while (!kvm_cpu_has_interrupt(vcpu)
653 && !signal_pending(current)
654 && !kvm_arch_vcpu_runnable(vcpu)) {
655 set_current_state(TASK_INTERRUPTIBLE);
661 __set_current_state(TASK_RUNNING);
662 remove_wait_queue(&vcpu->wq, &wait);
665 void kvm_resched(struct kvm_vcpu *vcpu)
671 EXPORT_SYMBOL_GPL(kvm_resched);
673 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
675 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
679 page = virt_to_page(vcpu->run);
680 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
681 page = virt_to_page(vcpu->arch.pio_data);
683 return VM_FAULT_SIGBUS;
689 static struct vm_operations_struct kvm_vcpu_vm_ops = {
690 .fault = kvm_vcpu_fault,
693 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
695 vma->vm_ops = &kvm_vcpu_vm_ops;
699 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
701 struct kvm_vcpu *vcpu = filp->private_data;
703 fput(vcpu->kvm->filp);
707 static struct file_operations kvm_vcpu_fops = {
708 .release = kvm_vcpu_release,
709 .unlocked_ioctl = kvm_vcpu_ioctl,
710 .compat_ioctl = kvm_vcpu_ioctl,
711 .mmap = kvm_vcpu_mmap,
715 * Allocates an inode for the vcpu.
717 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
723 r = anon_inode_getfd(&fd, &inode, &file,
724 "kvm-vcpu", &kvm_vcpu_fops, vcpu);
727 atomic_inc(&vcpu->kvm->filp->f_count);
732 * Creates some virtual cpus. Good luck creating more than one.
734 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
737 struct kvm_vcpu *vcpu;
742 vcpu = kvm_arch_vcpu_create(kvm, n);
744 return PTR_ERR(vcpu);
746 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
748 r = kvm_arch_vcpu_setup(vcpu);
752 mutex_lock(&kvm->lock);
755 mutex_unlock(&kvm->lock);
758 kvm->vcpus[n] = vcpu;
759 mutex_unlock(&kvm->lock);
761 /* Now it's all set up, let userspace reach it */
762 r = create_vcpu_fd(vcpu);
768 mutex_lock(&kvm->lock);
769 kvm->vcpus[n] = NULL;
770 mutex_unlock(&kvm->lock);
772 kvm_arch_vcpu_destroy(vcpu);
776 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
779 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
780 vcpu->sigset_active = 1;
781 vcpu->sigset = *sigset;
783 vcpu->sigset_active = 0;
787 static long kvm_vcpu_ioctl(struct file *filp,
788 unsigned int ioctl, unsigned long arg)
790 struct kvm_vcpu *vcpu = filp->private_data;
791 void __user *argp = (void __user *)arg;
794 if (vcpu->kvm->mm != current->mm)
801 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
804 struct kvm_regs kvm_regs;
806 memset(&kvm_regs, 0, sizeof kvm_regs);
807 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
811 if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
817 struct kvm_regs kvm_regs;
820 if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
822 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
828 case KVM_GET_SREGS: {
829 struct kvm_sregs kvm_sregs;
831 memset(&kvm_sregs, 0, sizeof kvm_sregs);
832 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
836 if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
841 case KVM_SET_SREGS: {
842 struct kvm_sregs kvm_sregs;
845 if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
847 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
853 case KVM_TRANSLATE: {
854 struct kvm_translation tr;
857 if (copy_from_user(&tr, argp, sizeof tr))
859 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
863 if (copy_to_user(argp, &tr, sizeof tr))
868 case KVM_DEBUG_GUEST: {
869 struct kvm_debug_guest dbg;
872 if (copy_from_user(&dbg, argp, sizeof dbg))
874 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
880 case KVM_SET_SIGNAL_MASK: {
881 struct kvm_signal_mask __user *sigmask_arg = argp;
882 struct kvm_signal_mask kvm_sigmask;
888 if (copy_from_user(&kvm_sigmask, argp,
892 if (kvm_sigmask.len != sizeof sigset)
895 if (copy_from_user(&sigset, sigmask_arg->sigset,
900 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
906 memset(&fpu, 0, sizeof fpu);
907 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
911 if (copy_to_user(argp, &fpu, sizeof fpu))
920 if (copy_from_user(&fpu, argp, sizeof fpu))
922 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
929 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
935 static long kvm_vm_ioctl(struct file *filp,
936 unsigned int ioctl, unsigned long arg)
938 struct kvm *kvm = filp->private_data;
939 void __user *argp = (void __user *)arg;
942 if (kvm->mm != current->mm)
945 case KVM_CREATE_VCPU:
946 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
950 case KVM_SET_USER_MEMORY_REGION: {
951 struct kvm_userspace_memory_region kvm_userspace_mem;
954 if (copy_from_user(&kvm_userspace_mem, argp,
955 sizeof kvm_userspace_mem))
958 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
963 case KVM_GET_DIRTY_LOG: {
964 struct kvm_dirty_log log;
967 if (copy_from_user(&log, argp, sizeof log))
969 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
975 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
981 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
983 struct kvm *kvm = vma->vm_file->private_data;
986 if (!kvm_is_visible_gfn(kvm, vmf->pgoff))
987 return VM_FAULT_SIGBUS;
988 page = gfn_to_page(kvm, vmf->pgoff);
989 if (is_error_page(page)) {
990 kvm_release_page_clean(page);
991 return VM_FAULT_SIGBUS;
997 static struct vm_operations_struct kvm_vm_vm_ops = {
998 .fault = kvm_vm_fault,
1001 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1003 vma->vm_ops = &kvm_vm_vm_ops;
1007 static struct file_operations kvm_vm_fops = {
1008 .release = kvm_vm_release,
1009 .unlocked_ioctl = kvm_vm_ioctl,
1010 .compat_ioctl = kvm_vm_ioctl,
1011 .mmap = kvm_vm_mmap,
1014 static int kvm_dev_ioctl_create_vm(void)
1017 struct inode *inode;
1021 kvm = kvm_create_vm();
1023 return PTR_ERR(kvm);
1024 r = anon_inode_getfd(&fd, &inode, &file, "kvm-vm", &kvm_vm_fops, kvm);
1026 kvm_destroy_vm(kvm);
1035 static long kvm_dev_ioctl(struct file *filp,
1036 unsigned int ioctl, unsigned long arg)
1038 void __user *argp = (void __user *)arg;
1042 case KVM_GET_API_VERSION:
1046 r = KVM_API_VERSION;
1052 r = kvm_dev_ioctl_create_vm();
1054 case KVM_CHECK_EXTENSION:
1055 r = kvm_dev_ioctl_check_extension((long)argp);
1057 case KVM_GET_VCPU_MMAP_SIZE:
1064 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1070 static struct file_operations kvm_chardev_ops = {
1071 .unlocked_ioctl = kvm_dev_ioctl,
1072 .compat_ioctl = kvm_dev_ioctl,
1075 static struct miscdevice kvm_dev = {
1081 static void hardware_enable(void *junk)
1083 int cpu = raw_smp_processor_id();
1085 if (cpu_isset(cpu, cpus_hardware_enabled))
1087 cpu_set(cpu, cpus_hardware_enabled);
1088 kvm_arch_hardware_enable(NULL);
1091 static void hardware_disable(void *junk)
1093 int cpu = raw_smp_processor_id();
1095 if (!cpu_isset(cpu, cpus_hardware_enabled))
1097 cpu_clear(cpu, cpus_hardware_enabled);
1098 decache_vcpus_on_cpu(cpu);
1099 kvm_arch_hardware_disable(NULL);
1102 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1107 val &= ~CPU_TASKS_FROZEN;
1110 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1112 hardware_disable(NULL);
1114 case CPU_UP_CANCELED:
1115 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1117 smp_call_function_single(cpu, hardware_disable, NULL, 0, 1);
1120 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1122 smp_call_function_single(cpu, hardware_enable, NULL, 0, 1);
1128 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1131 if (val == SYS_RESTART) {
1133 * Some (well, at least mine) BIOSes hang on reboot if
1136 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1137 on_each_cpu(hardware_disable, NULL, 0, 1);
1142 static struct notifier_block kvm_reboot_notifier = {
1143 .notifier_call = kvm_reboot,
1147 void kvm_io_bus_init(struct kvm_io_bus *bus)
1149 memset(bus, 0, sizeof(*bus));
1152 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1156 for (i = 0; i < bus->dev_count; i++) {
1157 struct kvm_io_device *pos = bus->devs[i];
1159 kvm_iodevice_destructor(pos);
1163 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus, gpa_t addr)
1167 for (i = 0; i < bus->dev_count; i++) {
1168 struct kvm_io_device *pos = bus->devs[i];
1170 if (pos->in_range(pos, addr))
1177 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
1179 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
1181 bus->devs[bus->dev_count++] = dev;
1184 static struct notifier_block kvm_cpu_notifier = {
1185 .notifier_call = kvm_cpu_hotplug,
1186 .priority = 20, /* must be > scheduler priority */
1189 static int vm_stat_get(void *_offset, u64 *val)
1191 unsigned offset = (long)_offset;
1195 spin_lock(&kvm_lock);
1196 list_for_each_entry(kvm, &vm_list, vm_list)
1197 *val += *(u32 *)((void *)kvm + offset);
1198 spin_unlock(&kvm_lock);
1202 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1204 static int vcpu_stat_get(void *_offset, u64 *val)
1206 unsigned offset = (long)_offset;
1208 struct kvm_vcpu *vcpu;
1212 spin_lock(&kvm_lock);
1213 list_for_each_entry(kvm, &vm_list, vm_list)
1214 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
1215 vcpu = kvm->vcpus[i];
1217 *val += *(u32 *)((void *)vcpu + offset);
1219 spin_unlock(&kvm_lock);
1223 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1225 static struct file_operations *stat_fops[] = {
1226 [KVM_STAT_VCPU] = &vcpu_stat_fops,
1227 [KVM_STAT_VM] = &vm_stat_fops,
1230 static void kvm_init_debug(void)
1232 struct kvm_stats_debugfs_item *p;
1234 debugfs_dir = debugfs_create_dir("kvm", NULL);
1235 for (p = debugfs_entries; p->name; ++p)
1236 p->dentry = debugfs_create_file(p->name, 0444, debugfs_dir,
1237 (void *)(long)p->offset,
1238 stat_fops[p->kind]);
1241 static void kvm_exit_debug(void)
1243 struct kvm_stats_debugfs_item *p;
1245 for (p = debugfs_entries; p->name; ++p)
1246 debugfs_remove(p->dentry);
1247 debugfs_remove(debugfs_dir);
1250 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1252 hardware_disable(NULL);
1256 static int kvm_resume(struct sys_device *dev)
1258 hardware_enable(NULL);
1262 static struct sysdev_class kvm_sysdev_class = {
1264 .suspend = kvm_suspend,
1265 .resume = kvm_resume,
1268 static struct sys_device kvm_sysdev = {
1270 .cls = &kvm_sysdev_class,
1273 struct page *bad_page;
1276 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1278 return container_of(pn, struct kvm_vcpu, preempt_notifier);
1281 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1283 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1285 kvm_arch_vcpu_load(vcpu, cpu);
1288 static void kvm_sched_out(struct preempt_notifier *pn,
1289 struct task_struct *next)
1291 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1293 kvm_arch_vcpu_put(vcpu);
1296 int kvm_init(void *opaque, unsigned int vcpu_size,
1297 struct module *module)
1304 r = kvm_arch_init(opaque);
1308 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1310 if (bad_page == NULL) {
1315 r = kvm_arch_hardware_setup();
1319 for_each_online_cpu(cpu) {
1320 smp_call_function_single(cpu,
1321 kvm_arch_check_processor_compat,
1327 on_each_cpu(hardware_enable, NULL, 0, 1);
1328 r = register_cpu_notifier(&kvm_cpu_notifier);
1331 register_reboot_notifier(&kvm_reboot_notifier);
1333 r = sysdev_class_register(&kvm_sysdev_class);
1337 r = sysdev_register(&kvm_sysdev);
1341 /* A kmem cache lets us meet the alignment requirements of fx_save. */
1342 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1343 __alignof__(struct kvm_vcpu),
1345 if (!kvm_vcpu_cache) {
1350 kvm_chardev_ops.owner = module;
1352 r = misc_register(&kvm_dev);
1354 printk(KERN_ERR "kvm: misc device register failed\n");
1358 kvm_preempt_ops.sched_in = kvm_sched_in;
1359 kvm_preempt_ops.sched_out = kvm_sched_out;
1364 kmem_cache_destroy(kvm_vcpu_cache);
1366 sysdev_unregister(&kvm_sysdev);
1368 sysdev_class_unregister(&kvm_sysdev_class);
1370 unregister_reboot_notifier(&kvm_reboot_notifier);
1371 unregister_cpu_notifier(&kvm_cpu_notifier);
1373 on_each_cpu(hardware_disable, NULL, 0, 1);
1375 kvm_arch_hardware_unsetup();
1377 __free_page(bad_page);
1384 EXPORT_SYMBOL_GPL(kvm_init);
1388 misc_deregister(&kvm_dev);
1389 kmem_cache_destroy(kvm_vcpu_cache);
1390 sysdev_unregister(&kvm_sysdev);
1391 sysdev_class_unregister(&kvm_sysdev_class);
1392 unregister_reboot_notifier(&kvm_reboot_notifier);
1393 unregister_cpu_notifier(&kvm_cpu_notifier);
1394 on_each_cpu(hardware_disable, NULL, 0, 1);
1395 kvm_arch_hardware_unsetup();
1398 __free_page(bad_page);
1400 EXPORT_SYMBOL_GPL(kvm_exit);