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>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
47 #include <asm/processor.h>
49 #include <asm/uaccess.h>
50 #include <asm/pgtable.h>
52 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
53 #include "coalesced_mmio.h"
56 #define CREATE_TRACE_POINTS
57 #include <trace/events/kvm.h>
59 MODULE_AUTHOR("Qumranet");
60 MODULE_LICENSE("GPL");
65 * kvm->slots_lock --> kvm->lock --> kvm->irq_lock
68 DEFINE_SPINLOCK(kvm_lock);
71 static cpumask_var_t cpus_hardware_enabled;
73 struct kmem_cache *kvm_vcpu_cache;
74 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
76 static __read_mostly struct preempt_ops kvm_preempt_ops;
78 struct dentry *kvm_debugfs_dir;
80 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
83 static bool kvm_rebooting;
85 static bool largepages_enabled = true;
87 inline int kvm_is_mmio_pfn(pfn_t pfn)
90 struct page *page = compound_head(pfn_to_page(pfn));
91 return PageReserved(page);
98 * Switches to specified vcpu, until a matching vcpu_put()
100 void vcpu_load(struct kvm_vcpu *vcpu)
104 mutex_lock(&vcpu->mutex);
106 preempt_notifier_register(&vcpu->preempt_notifier);
107 kvm_arch_vcpu_load(vcpu, cpu);
111 void vcpu_put(struct kvm_vcpu *vcpu)
114 kvm_arch_vcpu_put(vcpu);
115 preempt_notifier_unregister(&vcpu->preempt_notifier);
117 mutex_unlock(&vcpu->mutex);
120 static void ack_flush(void *_completed)
124 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
129 struct kvm_vcpu *vcpu;
131 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
133 spin_lock(&kvm->requests_lock);
134 me = smp_processor_id();
135 kvm_for_each_vcpu(i, vcpu, kvm) {
136 if (test_and_set_bit(req, &vcpu->requests))
139 if (cpus != NULL && cpu != -1 && cpu != me)
140 cpumask_set_cpu(cpu, cpus);
142 if (unlikely(cpus == NULL))
143 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
144 else if (!cpumask_empty(cpus))
145 smp_call_function_many(cpus, ack_flush, NULL, 1);
148 spin_unlock(&kvm->requests_lock);
149 free_cpumask_var(cpus);
153 void kvm_flush_remote_tlbs(struct kvm *kvm)
155 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
156 ++kvm->stat.remote_tlb_flush;
159 void kvm_reload_remote_mmus(struct kvm *kvm)
161 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
164 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
169 mutex_init(&vcpu->mutex);
173 init_waitqueue_head(&vcpu->wq);
175 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
180 vcpu->run = page_address(page);
182 r = kvm_arch_vcpu_init(vcpu);
188 free_page((unsigned long)vcpu->run);
192 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
194 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
196 kvm_arch_vcpu_uninit(vcpu);
197 free_page((unsigned long)vcpu->run);
199 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
201 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
202 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
204 return container_of(mn, struct kvm, mmu_notifier);
207 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
208 struct mm_struct *mm,
209 unsigned long address)
211 struct kvm *kvm = mmu_notifier_to_kvm(mn);
215 * When ->invalidate_page runs, the linux pte has been zapped
216 * already but the page is still allocated until
217 * ->invalidate_page returns. So if we increase the sequence
218 * here the kvm page fault will notice if the spte can't be
219 * established because the page is going to be freed. If
220 * instead the kvm page fault establishes the spte before
221 * ->invalidate_page runs, kvm_unmap_hva will release it
224 * The sequence increase only need to be seen at spin_unlock
225 * time, and not at spin_lock time.
227 * Increasing the sequence after the spin_unlock would be
228 * unsafe because the kvm page fault could then establish the
229 * pte after kvm_unmap_hva returned, without noticing the page
230 * is going to be freed.
232 spin_lock(&kvm->mmu_lock);
233 kvm->mmu_notifier_seq++;
234 need_tlb_flush = kvm_unmap_hva(kvm, address);
235 spin_unlock(&kvm->mmu_lock);
237 /* we've to flush the tlb before the pages can be freed */
239 kvm_flush_remote_tlbs(kvm);
243 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
244 struct mm_struct *mm,
245 unsigned long address,
248 struct kvm *kvm = mmu_notifier_to_kvm(mn);
250 spin_lock(&kvm->mmu_lock);
251 kvm->mmu_notifier_seq++;
252 kvm_set_spte_hva(kvm, address, pte);
253 spin_unlock(&kvm->mmu_lock);
256 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
257 struct mm_struct *mm,
261 struct kvm *kvm = mmu_notifier_to_kvm(mn);
262 int need_tlb_flush = 0;
264 spin_lock(&kvm->mmu_lock);
266 * The count increase must become visible at unlock time as no
267 * spte can be established without taking the mmu_lock and
268 * count is also read inside the mmu_lock critical section.
270 kvm->mmu_notifier_count++;
271 for (; start < end; start += PAGE_SIZE)
272 need_tlb_flush |= kvm_unmap_hva(kvm, start);
273 spin_unlock(&kvm->mmu_lock);
275 /* we've to flush the tlb before the pages can be freed */
277 kvm_flush_remote_tlbs(kvm);
280 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
281 struct mm_struct *mm,
285 struct kvm *kvm = mmu_notifier_to_kvm(mn);
287 spin_lock(&kvm->mmu_lock);
289 * This sequence increase will notify the kvm page fault that
290 * the page that is going to be mapped in the spte could have
293 kvm->mmu_notifier_seq++;
295 * The above sequence increase must be visible before the
296 * below count decrease but both values are read by the kvm
297 * page fault under mmu_lock spinlock so we don't need to add
298 * a smb_wmb() here in between the two.
300 kvm->mmu_notifier_count--;
301 spin_unlock(&kvm->mmu_lock);
303 BUG_ON(kvm->mmu_notifier_count < 0);
306 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
307 struct mm_struct *mm,
308 unsigned long address)
310 struct kvm *kvm = mmu_notifier_to_kvm(mn);
313 spin_lock(&kvm->mmu_lock);
314 young = kvm_age_hva(kvm, address);
315 spin_unlock(&kvm->mmu_lock);
318 kvm_flush_remote_tlbs(kvm);
323 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
324 struct mm_struct *mm)
326 struct kvm *kvm = mmu_notifier_to_kvm(mn);
327 kvm_arch_flush_shadow(kvm);
330 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
331 .invalidate_page = kvm_mmu_notifier_invalidate_page,
332 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
333 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
334 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
335 .change_pte = kvm_mmu_notifier_change_pte,
336 .release = kvm_mmu_notifier_release,
338 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
340 static struct kvm *kvm_create_vm(void)
342 struct kvm *kvm = kvm_arch_create_vm();
343 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
349 #ifdef CONFIG_HAVE_KVM_IRQCHIP
350 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
351 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
354 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
355 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
358 return ERR_PTR(-ENOMEM);
360 kvm->coalesced_mmio_ring =
361 (struct kvm_coalesced_mmio_ring *)page_address(page);
364 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
367 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
368 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
370 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
379 kvm->mm = current->mm;
380 atomic_inc(&kvm->mm->mm_count);
381 spin_lock_init(&kvm->mmu_lock);
382 spin_lock_init(&kvm->requests_lock);
383 kvm_io_bus_init(&kvm->pio_bus);
384 kvm_eventfd_init(kvm);
385 mutex_init(&kvm->lock);
386 mutex_init(&kvm->irq_lock);
387 kvm_io_bus_init(&kvm->mmio_bus);
388 init_rwsem(&kvm->slots_lock);
389 atomic_set(&kvm->users_count, 1);
390 spin_lock(&kvm_lock);
391 list_add(&kvm->vm_list, &vm_list);
392 spin_unlock(&kvm_lock);
393 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
394 kvm_coalesced_mmio_init(kvm);
401 * Free any memory in @free but not in @dont.
403 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
404 struct kvm_memory_slot *dont)
408 if (!dont || free->rmap != dont->rmap)
411 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
412 vfree(free->dirty_bitmap);
415 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
416 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
417 vfree(free->lpage_info[i]);
418 free->lpage_info[i] = NULL;
423 free->dirty_bitmap = NULL;
427 void kvm_free_physmem(struct kvm *kvm)
431 for (i = 0; i < kvm->nmemslots; ++i)
432 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
435 static void kvm_destroy_vm(struct kvm *kvm)
437 struct mm_struct *mm = kvm->mm;
439 kvm_arch_sync_events(kvm);
440 spin_lock(&kvm_lock);
441 list_del(&kvm->vm_list);
442 spin_unlock(&kvm_lock);
443 kvm_free_irq_routing(kvm);
444 kvm_io_bus_destroy(&kvm->pio_bus);
445 kvm_io_bus_destroy(&kvm->mmio_bus);
446 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
447 if (kvm->coalesced_mmio_ring != NULL)
448 free_page((unsigned long)kvm->coalesced_mmio_ring);
450 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
451 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
453 kvm_arch_flush_shadow(kvm);
455 kvm_arch_destroy_vm(kvm);
459 void kvm_get_kvm(struct kvm *kvm)
461 atomic_inc(&kvm->users_count);
463 EXPORT_SYMBOL_GPL(kvm_get_kvm);
465 void kvm_put_kvm(struct kvm *kvm)
467 if (atomic_dec_and_test(&kvm->users_count))
470 EXPORT_SYMBOL_GPL(kvm_put_kvm);
473 static int kvm_vm_release(struct inode *inode, struct file *filp)
475 struct kvm *kvm = filp->private_data;
477 kvm_irqfd_release(kvm);
484 * Allocate some memory and give it an address in the guest physical address
487 * Discontiguous memory is allowed, mostly for framebuffers.
489 * Must be called holding mmap_sem for write.
491 int __kvm_set_memory_region(struct kvm *kvm,
492 struct kvm_userspace_memory_region *mem,
497 unsigned long npages;
499 struct kvm_memory_slot *memslot;
500 struct kvm_memory_slot old, new;
503 /* General sanity checks */
504 if (mem->memory_size & (PAGE_SIZE - 1))
506 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
508 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
510 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
512 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
515 memslot = &kvm->memslots[mem->slot];
516 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
517 npages = mem->memory_size >> PAGE_SHIFT;
520 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
522 new = old = *memslot;
524 new.base_gfn = base_gfn;
526 new.flags = mem->flags;
528 /* Disallow changing a memory slot's size. */
530 if (npages && old.npages && npages != old.npages)
533 /* Check for overlaps */
535 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
536 struct kvm_memory_slot *s = &kvm->memslots[i];
538 if (s == memslot || !s->npages)
540 if (!((base_gfn + npages <= s->base_gfn) ||
541 (base_gfn >= s->base_gfn + s->npages)))
545 /* Free page dirty bitmap if unneeded */
546 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
547 new.dirty_bitmap = NULL;
551 /* Allocate if a slot is being created */
553 if (npages && !new.rmap) {
554 new.rmap = vmalloc(npages * sizeof(struct page *));
559 memset(new.rmap, 0, npages * sizeof(*new.rmap));
561 new.user_alloc = user_alloc;
563 * hva_to_rmmap() serialzies with the mmu_lock and to be
564 * safe it has to ignore memslots with !user_alloc &&
568 new.userspace_addr = mem->userspace_addr;
570 new.userspace_addr = 0;
575 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
581 /* Avoid unused variable warning if no large pages */
584 if (new.lpage_info[i])
587 lpages = 1 + (base_gfn + npages - 1) /
588 KVM_PAGES_PER_HPAGE(level);
589 lpages -= base_gfn / KVM_PAGES_PER_HPAGE(level);
591 new.lpage_info[i] = vmalloc(lpages * sizeof(*new.lpage_info[i]));
593 if (!new.lpage_info[i])
596 memset(new.lpage_info[i], 0,
597 lpages * sizeof(*new.lpage_info[i]));
599 if (base_gfn % KVM_PAGES_PER_HPAGE(level))
600 new.lpage_info[i][0].write_count = 1;
601 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE(level))
602 new.lpage_info[i][lpages - 1].write_count = 1;
603 ugfn = new.userspace_addr >> PAGE_SHIFT;
605 * If the gfn and userspace address are not aligned wrt each
606 * other, or if explicitly asked to, disable large page
607 * support for this slot
609 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
611 for (j = 0; j < lpages; ++j)
612 new.lpage_info[i][j].write_count = 1;
617 /* Allocate page dirty bitmap if needed */
618 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
619 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
621 new.dirty_bitmap = vmalloc(dirty_bytes);
622 if (!new.dirty_bitmap)
624 memset(new.dirty_bitmap, 0, dirty_bytes);
626 kvm_arch_flush_shadow(kvm);
628 #else /* not defined CONFIG_S390 */
629 new.user_alloc = user_alloc;
631 new.userspace_addr = mem->userspace_addr;
632 #endif /* not defined CONFIG_S390 */
635 kvm_arch_flush_shadow(kvm);
637 spin_lock(&kvm->mmu_lock);
638 if (mem->slot >= kvm->nmemslots)
639 kvm->nmemslots = mem->slot + 1;
642 spin_unlock(&kvm->mmu_lock);
644 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
646 spin_lock(&kvm->mmu_lock);
648 spin_unlock(&kvm->mmu_lock);
652 kvm_free_physmem_slot(&old, npages ? &new : NULL);
653 /* Slot deletion case: we have to update the current slot */
654 spin_lock(&kvm->mmu_lock);
657 spin_unlock(&kvm->mmu_lock);
659 /* map the pages in iommu page table */
660 r = kvm_iommu_map_pages(kvm, base_gfn, npages);
667 kvm_free_physmem_slot(&new, &old);
672 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
674 int kvm_set_memory_region(struct kvm *kvm,
675 struct kvm_userspace_memory_region *mem,
680 down_write(&kvm->slots_lock);
681 r = __kvm_set_memory_region(kvm, mem, user_alloc);
682 up_write(&kvm->slots_lock);
685 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
687 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
689 kvm_userspace_memory_region *mem,
692 if (mem->slot >= KVM_MEMORY_SLOTS)
694 return kvm_set_memory_region(kvm, mem, user_alloc);
697 int kvm_get_dirty_log(struct kvm *kvm,
698 struct kvm_dirty_log *log, int *is_dirty)
700 struct kvm_memory_slot *memslot;
703 unsigned long any = 0;
706 if (log->slot >= KVM_MEMORY_SLOTS)
709 memslot = &kvm->memslots[log->slot];
711 if (!memslot->dirty_bitmap)
714 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
716 for (i = 0; !any && i < n/sizeof(long); ++i)
717 any = memslot->dirty_bitmap[i];
720 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
731 void kvm_disable_largepages(void)
733 largepages_enabled = false;
735 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
737 int is_error_page(struct page *page)
739 return page == bad_page;
741 EXPORT_SYMBOL_GPL(is_error_page);
743 int is_error_pfn(pfn_t pfn)
745 return pfn == bad_pfn;
747 EXPORT_SYMBOL_GPL(is_error_pfn);
749 static inline unsigned long bad_hva(void)
754 int kvm_is_error_hva(unsigned long addr)
756 return addr == bad_hva();
758 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
760 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
764 for (i = 0; i < kvm->nmemslots; ++i) {
765 struct kvm_memory_slot *memslot = &kvm->memslots[i];
767 if (gfn >= memslot->base_gfn
768 && gfn < memslot->base_gfn + memslot->npages)
773 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
775 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
777 gfn = unalias_gfn(kvm, gfn);
778 return gfn_to_memslot_unaliased(kvm, gfn);
781 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
785 gfn = unalias_gfn(kvm, gfn);
786 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
787 struct kvm_memory_slot *memslot = &kvm->memslots[i];
789 if (gfn >= memslot->base_gfn
790 && gfn < memslot->base_gfn + memslot->npages)
795 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
797 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
799 struct kvm_memory_slot *slot;
801 gfn = unalias_gfn(kvm, gfn);
802 slot = gfn_to_memslot_unaliased(kvm, gfn);
805 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
807 EXPORT_SYMBOL_GPL(gfn_to_hva);
809 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
811 struct page *page[1];
818 addr = gfn_to_hva(kvm, gfn);
819 if (kvm_is_error_hva(addr)) {
821 return page_to_pfn(bad_page);
824 npages = get_user_pages_fast(addr, 1, 1, page);
826 if (unlikely(npages != 1)) {
827 struct vm_area_struct *vma;
829 down_read(¤t->mm->mmap_sem);
830 vma = find_vma(current->mm, addr);
832 if (vma == NULL || addr < vma->vm_start ||
833 !(vma->vm_flags & VM_PFNMAP)) {
834 up_read(¤t->mm->mmap_sem);
836 return page_to_pfn(bad_page);
839 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
840 up_read(¤t->mm->mmap_sem);
841 BUG_ON(!kvm_is_mmio_pfn(pfn));
843 pfn = page_to_pfn(page[0]);
848 EXPORT_SYMBOL_GPL(gfn_to_pfn);
850 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
854 pfn = gfn_to_pfn(kvm, gfn);
855 if (!kvm_is_mmio_pfn(pfn))
856 return pfn_to_page(pfn);
858 WARN_ON(kvm_is_mmio_pfn(pfn));
864 EXPORT_SYMBOL_GPL(gfn_to_page);
866 void kvm_release_page_clean(struct page *page)
868 kvm_release_pfn_clean(page_to_pfn(page));
870 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
872 void kvm_release_pfn_clean(pfn_t pfn)
874 if (!kvm_is_mmio_pfn(pfn))
875 put_page(pfn_to_page(pfn));
877 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
879 void kvm_release_page_dirty(struct page *page)
881 kvm_release_pfn_dirty(page_to_pfn(page));
883 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
885 void kvm_release_pfn_dirty(pfn_t pfn)
887 kvm_set_pfn_dirty(pfn);
888 kvm_release_pfn_clean(pfn);
890 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
892 void kvm_set_page_dirty(struct page *page)
894 kvm_set_pfn_dirty(page_to_pfn(page));
896 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
898 void kvm_set_pfn_dirty(pfn_t pfn)
900 if (!kvm_is_mmio_pfn(pfn)) {
901 struct page *page = pfn_to_page(pfn);
902 if (!PageReserved(page))
906 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
908 void kvm_set_pfn_accessed(pfn_t pfn)
910 if (!kvm_is_mmio_pfn(pfn))
911 mark_page_accessed(pfn_to_page(pfn));
913 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
915 void kvm_get_pfn(pfn_t pfn)
917 if (!kvm_is_mmio_pfn(pfn))
918 get_page(pfn_to_page(pfn));
920 EXPORT_SYMBOL_GPL(kvm_get_pfn);
922 static int next_segment(unsigned long len, int offset)
924 if (len > PAGE_SIZE - offset)
925 return PAGE_SIZE - offset;
930 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
936 addr = gfn_to_hva(kvm, gfn);
937 if (kvm_is_error_hva(addr))
939 r = copy_from_user(data, (void __user *)addr + offset, len);
944 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
946 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
948 gfn_t gfn = gpa >> PAGE_SHIFT;
950 int offset = offset_in_page(gpa);
953 while ((seg = next_segment(len, offset)) != 0) {
954 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
964 EXPORT_SYMBOL_GPL(kvm_read_guest);
966 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
971 gfn_t gfn = gpa >> PAGE_SHIFT;
972 int offset = offset_in_page(gpa);
974 addr = gfn_to_hva(kvm, gfn);
975 if (kvm_is_error_hva(addr))
978 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
984 EXPORT_SYMBOL(kvm_read_guest_atomic);
986 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
992 addr = gfn_to_hva(kvm, gfn);
993 if (kvm_is_error_hva(addr))
995 r = copy_to_user((void __user *)addr + offset, data, len);
998 mark_page_dirty(kvm, gfn);
1001 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1003 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1006 gfn_t gfn = gpa >> PAGE_SHIFT;
1008 int offset = offset_in_page(gpa);
1011 while ((seg = next_segment(len, offset)) != 0) {
1012 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1023 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1025 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1027 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1029 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1031 gfn_t gfn = gpa >> PAGE_SHIFT;
1033 int offset = offset_in_page(gpa);
1036 while ((seg = next_segment(len, offset)) != 0) {
1037 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1046 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1048 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1050 struct kvm_memory_slot *memslot;
1052 gfn = unalias_gfn(kvm, gfn);
1053 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1054 if (memslot && memslot->dirty_bitmap) {
1055 unsigned long rel_gfn = gfn - memslot->base_gfn;
1058 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1059 set_bit(rel_gfn, memslot->dirty_bitmap);
1064 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1066 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1071 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1073 if (kvm_arch_vcpu_runnable(vcpu)) {
1074 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1077 if (kvm_cpu_has_pending_timer(vcpu))
1079 if (signal_pending(current))
1085 finish_wait(&vcpu->wq, &wait);
1088 void kvm_resched(struct kvm_vcpu *vcpu)
1090 if (!need_resched())
1094 EXPORT_SYMBOL_GPL(kvm_resched);
1096 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1098 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1101 if (vmf->pgoff == 0)
1102 page = virt_to_page(vcpu->run);
1104 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1105 page = virt_to_page(vcpu->arch.pio_data);
1107 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1108 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1109 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1112 return VM_FAULT_SIGBUS;
1118 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1119 .fault = kvm_vcpu_fault,
1122 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1124 vma->vm_ops = &kvm_vcpu_vm_ops;
1128 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1130 struct kvm_vcpu *vcpu = filp->private_data;
1132 kvm_put_kvm(vcpu->kvm);
1136 static struct file_operations kvm_vcpu_fops = {
1137 .release = kvm_vcpu_release,
1138 .unlocked_ioctl = kvm_vcpu_ioctl,
1139 .compat_ioctl = kvm_vcpu_ioctl,
1140 .mmap = kvm_vcpu_mmap,
1144 * Allocates an inode for the vcpu.
1146 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1148 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1152 * Creates some virtual cpus. Good luck creating more than one.
1154 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1157 struct kvm_vcpu *vcpu, *v;
1159 vcpu = kvm_arch_vcpu_create(kvm, id);
1161 return PTR_ERR(vcpu);
1163 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1165 r = kvm_arch_vcpu_setup(vcpu);
1169 mutex_lock(&kvm->lock);
1170 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1175 kvm_for_each_vcpu(r, v, kvm)
1176 if (v->vcpu_id == id) {
1181 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1183 /* Now it's all set up, let userspace reach it */
1185 r = create_vcpu_fd(vcpu);
1191 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1193 atomic_inc(&kvm->online_vcpus);
1195 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1196 if (kvm->bsp_vcpu_id == id)
1197 kvm->bsp_vcpu = vcpu;
1199 mutex_unlock(&kvm->lock);
1203 mutex_unlock(&kvm->lock);
1204 kvm_arch_vcpu_destroy(vcpu);
1208 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1211 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1212 vcpu->sigset_active = 1;
1213 vcpu->sigset = *sigset;
1215 vcpu->sigset_active = 0;
1219 static long kvm_vcpu_ioctl(struct file *filp,
1220 unsigned int ioctl, unsigned long arg)
1222 struct kvm_vcpu *vcpu = filp->private_data;
1223 void __user *argp = (void __user *)arg;
1225 struct kvm_fpu *fpu = NULL;
1226 struct kvm_sregs *kvm_sregs = NULL;
1228 if (vcpu->kvm->mm != current->mm)
1235 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1237 case KVM_GET_REGS: {
1238 struct kvm_regs *kvm_regs;
1241 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1244 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1248 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1255 case KVM_SET_REGS: {
1256 struct kvm_regs *kvm_regs;
1259 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1263 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1265 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1273 case KVM_GET_SREGS: {
1274 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1278 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1282 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1287 case KVM_SET_SREGS: {
1288 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1293 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1295 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1301 case KVM_GET_MP_STATE: {
1302 struct kvm_mp_state mp_state;
1304 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1308 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1313 case KVM_SET_MP_STATE: {
1314 struct kvm_mp_state mp_state;
1317 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1319 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1325 case KVM_TRANSLATE: {
1326 struct kvm_translation tr;
1329 if (copy_from_user(&tr, argp, sizeof tr))
1331 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1335 if (copy_to_user(argp, &tr, sizeof tr))
1340 case KVM_SET_GUEST_DEBUG: {
1341 struct kvm_guest_debug dbg;
1344 if (copy_from_user(&dbg, argp, sizeof dbg))
1346 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1352 case KVM_SET_SIGNAL_MASK: {
1353 struct kvm_signal_mask __user *sigmask_arg = argp;
1354 struct kvm_signal_mask kvm_sigmask;
1355 sigset_t sigset, *p;
1360 if (copy_from_user(&kvm_sigmask, argp,
1361 sizeof kvm_sigmask))
1364 if (kvm_sigmask.len != sizeof sigset)
1367 if (copy_from_user(&sigset, sigmask_arg->sigset,
1372 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1376 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1380 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1384 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1390 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1395 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1397 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1404 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1412 static long kvm_vm_ioctl(struct file *filp,
1413 unsigned int ioctl, unsigned long arg)
1415 struct kvm *kvm = filp->private_data;
1416 void __user *argp = (void __user *)arg;
1419 if (kvm->mm != current->mm)
1422 case KVM_CREATE_VCPU:
1423 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1427 case KVM_SET_USER_MEMORY_REGION: {
1428 struct kvm_userspace_memory_region kvm_userspace_mem;
1431 if (copy_from_user(&kvm_userspace_mem, argp,
1432 sizeof kvm_userspace_mem))
1435 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1440 case KVM_GET_DIRTY_LOG: {
1441 struct kvm_dirty_log log;
1444 if (copy_from_user(&log, argp, sizeof log))
1446 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1451 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1452 case KVM_REGISTER_COALESCED_MMIO: {
1453 struct kvm_coalesced_mmio_zone zone;
1455 if (copy_from_user(&zone, argp, sizeof zone))
1458 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1464 case KVM_UNREGISTER_COALESCED_MMIO: {
1465 struct kvm_coalesced_mmio_zone zone;
1467 if (copy_from_user(&zone, argp, sizeof zone))
1470 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1478 struct kvm_irqfd data;
1481 if (copy_from_user(&data, argp, sizeof data))
1483 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
1486 case KVM_IOEVENTFD: {
1487 struct kvm_ioeventfd data;
1490 if (copy_from_user(&data, argp, sizeof data))
1492 r = kvm_ioeventfd(kvm, &data);
1495 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1496 case KVM_SET_BOOT_CPU_ID:
1498 mutex_lock(&kvm->lock);
1499 if (atomic_read(&kvm->online_vcpus) != 0)
1502 kvm->bsp_vcpu_id = arg;
1503 mutex_unlock(&kvm->lock);
1507 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1509 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
1515 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1517 struct page *page[1];
1520 gfn_t gfn = vmf->pgoff;
1521 struct kvm *kvm = vma->vm_file->private_data;
1523 addr = gfn_to_hva(kvm, gfn);
1524 if (kvm_is_error_hva(addr))
1525 return VM_FAULT_SIGBUS;
1527 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1529 if (unlikely(npages != 1))
1530 return VM_FAULT_SIGBUS;
1532 vmf->page = page[0];
1536 static const struct vm_operations_struct kvm_vm_vm_ops = {
1537 .fault = kvm_vm_fault,
1540 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1542 vma->vm_ops = &kvm_vm_vm_ops;
1546 static struct file_operations kvm_vm_fops = {
1547 .release = kvm_vm_release,
1548 .unlocked_ioctl = kvm_vm_ioctl,
1549 .compat_ioctl = kvm_vm_ioctl,
1550 .mmap = kvm_vm_mmap,
1553 static int kvm_dev_ioctl_create_vm(void)
1558 kvm = kvm_create_vm();
1560 return PTR_ERR(kvm);
1561 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
1568 static long kvm_dev_ioctl_check_extension_generic(long arg)
1571 case KVM_CAP_USER_MEMORY:
1572 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1573 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
1574 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1575 case KVM_CAP_SET_BOOT_CPU_ID:
1578 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1579 case KVM_CAP_IRQ_ROUTING:
1580 return KVM_MAX_IRQ_ROUTES;
1585 return kvm_dev_ioctl_check_extension(arg);
1588 static long kvm_dev_ioctl(struct file *filp,
1589 unsigned int ioctl, unsigned long arg)
1594 case KVM_GET_API_VERSION:
1598 r = KVM_API_VERSION;
1604 r = kvm_dev_ioctl_create_vm();
1606 case KVM_CHECK_EXTENSION:
1607 r = kvm_dev_ioctl_check_extension_generic(arg);
1609 case KVM_GET_VCPU_MMAP_SIZE:
1613 r = PAGE_SIZE; /* struct kvm_run */
1615 r += PAGE_SIZE; /* pio data page */
1617 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1618 r += PAGE_SIZE; /* coalesced mmio ring page */
1621 case KVM_TRACE_ENABLE:
1622 case KVM_TRACE_PAUSE:
1623 case KVM_TRACE_DISABLE:
1627 return kvm_arch_dev_ioctl(filp, ioctl, arg);
1633 static struct file_operations kvm_chardev_ops = {
1634 .unlocked_ioctl = kvm_dev_ioctl,
1635 .compat_ioctl = kvm_dev_ioctl,
1638 static struct miscdevice kvm_dev = {
1644 static void hardware_enable(void *junk)
1646 int cpu = raw_smp_processor_id();
1648 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
1650 cpumask_set_cpu(cpu, cpus_hardware_enabled);
1651 kvm_arch_hardware_enable(NULL);
1654 static void hardware_disable(void *junk)
1656 int cpu = raw_smp_processor_id();
1658 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
1660 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
1661 kvm_arch_hardware_disable(NULL);
1664 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
1669 val &= ~CPU_TASKS_FROZEN;
1672 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1674 hardware_disable(NULL);
1676 case CPU_UP_CANCELED:
1677 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
1679 smp_call_function_single(cpu, hardware_disable, NULL, 1);
1682 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
1684 smp_call_function_single(cpu, hardware_enable, NULL, 1);
1691 asmlinkage void kvm_handle_fault_on_reboot(void)
1694 /* spin while reset goes on */
1697 /* Fault while not rebooting. We want the trace. */
1700 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
1702 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
1706 * Some (well, at least mine) BIOSes hang on reboot if
1709 * And Intel TXT required VMX off for all cpu when system shutdown.
1711 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
1712 kvm_rebooting = true;
1713 on_each_cpu(hardware_disable, NULL, 1);
1717 static struct notifier_block kvm_reboot_notifier = {
1718 .notifier_call = kvm_reboot,
1722 void kvm_io_bus_init(struct kvm_io_bus *bus)
1724 memset(bus, 0, sizeof(*bus));
1727 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
1731 for (i = 0; i < bus->dev_count; i++) {
1732 struct kvm_io_device *pos = bus->devs[i];
1734 kvm_iodevice_destructor(pos);
1738 /* kvm_io_bus_write - called under kvm->slots_lock */
1739 int kvm_io_bus_write(struct kvm_io_bus *bus, gpa_t addr,
1740 int len, const void *val)
1743 for (i = 0; i < bus->dev_count; i++)
1744 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
1749 /* kvm_io_bus_read - called under kvm->slots_lock */
1750 int kvm_io_bus_read(struct kvm_io_bus *bus, gpa_t addr, int len, void *val)
1753 for (i = 0; i < bus->dev_count; i++)
1754 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
1759 int kvm_io_bus_register_dev(struct kvm *kvm, struct kvm_io_bus *bus,
1760 struct kvm_io_device *dev)
1764 down_write(&kvm->slots_lock);
1765 ret = __kvm_io_bus_register_dev(bus, dev);
1766 up_write(&kvm->slots_lock);
1771 /* An unlocked version. Caller must have write lock on slots_lock. */
1772 int __kvm_io_bus_register_dev(struct kvm_io_bus *bus,
1773 struct kvm_io_device *dev)
1775 if (bus->dev_count > NR_IOBUS_DEVS-1)
1778 bus->devs[bus->dev_count++] = dev;
1783 void kvm_io_bus_unregister_dev(struct kvm *kvm,
1784 struct kvm_io_bus *bus,
1785 struct kvm_io_device *dev)
1787 down_write(&kvm->slots_lock);
1788 __kvm_io_bus_unregister_dev(bus, dev);
1789 up_write(&kvm->slots_lock);
1792 /* An unlocked version. Caller must have write lock on slots_lock. */
1793 void __kvm_io_bus_unregister_dev(struct kvm_io_bus *bus,
1794 struct kvm_io_device *dev)
1798 for (i = 0; i < bus->dev_count; i++)
1799 if (bus->devs[i] == dev) {
1800 bus->devs[i] = bus->devs[--bus->dev_count];
1805 static struct notifier_block kvm_cpu_notifier = {
1806 .notifier_call = kvm_cpu_hotplug,
1807 .priority = 20, /* must be > scheduler priority */
1810 static int vm_stat_get(void *_offset, u64 *val)
1812 unsigned offset = (long)_offset;
1816 spin_lock(&kvm_lock);
1817 list_for_each_entry(kvm, &vm_list, vm_list)
1818 *val += *(u32 *)((void *)kvm + offset);
1819 spin_unlock(&kvm_lock);
1823 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
1825 static int vcpu_stat_get(void *_offset, u64 *val)
1827 unsigned offset = (long)_offset;
1829 struct kvm_vcpu *vcpu;
1833 spin_lock(&kvm_lock);
1834 list_for_each_entry(kvm, &vm_list, vm_list)
1835 kvm_for_each_vcpu(i, vcpu, kvm)
1836 *val += *(u32 *)((void *)vcpu + offset);
1838 spin_unlock(&kvm_lock);
1842 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
1844 static const struct file_operations *stat_fops[] = {
1845 [KVM_STAT_VCPU] = &vcpu_stat_fops,
1846 [KVM_STAT_VM] = &vm_stat_fops,
1849 static void kvm_init_debug(void)
1851 struct kvm_stats_debugfs_item *p;
1853 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
1854 for (p = debugfs_entries; p->name; ++p)
1855 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
1856 (void *)(long)p->offset,
1857 stat_fops[p->kind]);
1860 static void kvm_exit_debug(void)
1862 struct kvm_stats_debugfs_item *p;
1864 for (p = debugfs_entries; p->name; ++p)
1865 debugfs_remove(p->dentry);
1866 debugfs_remove(kvm_debugfs_dir);
1869 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
1871 hardware_disable(NULL);
1875 static int kvm_resume(struct sys_device *dev)
1877 hardware_enable(NULL);
1881 static struct sysdev_class kvm_sysdev_class = {
1883 .suspend = kvm_suspend,
1884 .resume = kvm_resume,
1887 static struct sys_device kvm_sysdev = {
1889 .cls = &kvm_sysdev_class,
1892 struct page *bad_page;
1896 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
1898 return container_of(pn, struct kvm_vcpu, preempt_notifier);
1901 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
1903 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1905 kvm_arch_vcpu_load(vcpu, cpu);
1908 static void kvm_sched_out(struct preempt_notifier *pn,
1909 struct task_struct *next)
1911 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
1913 kvm_arch_vcpu_put(vcpu);
1916 int kvm_init(void *opaque, unsigned int vcpu_size,
1917 struct module *module)
1922 r = kvm_arch_init(opaque);
1926 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
1928 if (bad_page == NULL) {
1933 bad_pfn = page_to_pfn(bad_page);
1935 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
1940 r = kvm_arch_hardware_setup();
1944 for_each_online_cpu(cpu) {
1945 smp_call_function_single(cpu,
1946 kvm_arch_check_processor_compat,
1952 on_each_cpu(hardware_enable, NULL, 1);
1953 r = register_cpu_notifier(&kvm_cpu_notifier);
1956 register_reboot_notifier(&kvm_reboot_notifier);
1958 r = sysdev_class_register(&kvm_sysdev_class);
1962 r = sysdev_register(&kvm_sysdev);
1966 /* A kmem cache lets us meet the alignment requirements of fx_save. */
1967 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
1968 __alignof__(struct kvm_vcpu),
1970 if (!kvm_vcpu_cache) {
1975 kvm_chardev_ops.owner = module;
1976 kvm_vm_fops.owner = module;
1977 kvm_vcpu_fops.owner = module;
1979 r = misc_register(&kvm_dev);
1981 printk(KERN_ERR "kvm: misc device register failed\n");
1985 kvm_preempt_ops.sched_in = kvm_sched_in;
1986 kvm_preempt_ops.sched_out = kvm_sched_out;
1993 kmem_cache_destroy(kvm_vcpu_cache);
1995 sysdev_unregister(&kvm_sysdev);
1997 sysdev_class_unregister(&kvm_sysdev_class);
1999 unregister_reboot_notifier(&kvm_reboot_notifier);
2000 unregister_cpu_notifier(&kvm_cpu_notifier);
2002 on_each_cpu(hardware_disable, NULL, 1);
2004 kvm_arch_hardware_unsetup();
2006 free_cpumask_var(cpus_hardware_enabled);
2008 __free_page(bad_page);
2014 EXPORT_SYMBOL_GPL(kvm_init);
2018 tracepoint_synchronize_unregister();
2020 misc_deregister(&kvm_dev);
2021 kmem_cache_destroy(kvm_vcpu_cache);
2022 sysdev_unregister(&kvm_sysdev);
2023 sysdev_class_unregister(&kvm_sysdev_class);
2024 unregister_reboot_notifier(&kvm_reboot_notifier);
2025 unregister_cpu_notifier(&kvm_cpu_notifier);
2026 on_each_cpu(hardware_disable, NULL, 1);
2027 kvm_arch_hardware_unsetup();
2029 free_cpumask_var(cpus_hardware_enabled);
2030 __free_page(bad_page);
2032 EXPORT_SYMBOL_GPL(kvm_exit);