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.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.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/syscore_ops.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>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
58 #include "coalesced_mmio.h"
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
70 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
73 DEFINE_RAW_SPINLOCK(kvm_lock);
76 static cpumask_var_t cpus_hardware_enabled;
77 static int kvm_usage_count = 0;
78 static atomic_t hardware_enable_failed;
80 struct kmem_cache *kvm_vcpu_cache;
81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
83 static __read_mostly struct preempt_ops kvm_preempt_ops;
85 struct dentry *kvm_debugfs_dir;
87 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
90 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
93 static int hardware_enable_all(void);
94 static void hardware_disable_all(void);
96 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
99 EXPORT_SYMBOL_GPL(kvm_rebooting);
101 static bool largepages_enabled = true;
103 bool kvm_is_mmio_pfn(pfn_t pfn)
105 if (pfn_valid(pfn)) {
107 struct page *tail = pfn_to_page(pfn);
108 struct page *head = compound_trans_head(tail);
109 reserved = PageReserved(head);
112 * "head" is not a dangling pointer
113 * (compound_trans_head takes care of that)
114 * but the hugepage may have been splitted
115 * from under us (and we may not hold a
116 * reference count on the head page so it can
117 * be reused before we run PageReferenced), so
118 * we've to check PageTail before returning
125 return PageReserved(tail);
132 * Switches to specified vcpu, until a matching vcpu_put()
134 void vcpu_load(struct kvm_vcpu *vcpu)
138 mutex_lock(&vcpu->mutex);
139 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
140 /* The thread running this VCPU changed. */
141 struct pid *oldpid = vcpu->pid;
142 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
143 rcu_assign_pointer(vcpu->pid, newpid);
148 preempt_notifier_register(&vcpu->preempt_notifier);
149 kvm_arch_vcpu_load(vcpu, cpu);
153 void vcpu_put(struct kvm_vcpu *vcpu)
156 kvm_arch_vcpu_put(vcpu);
157 preempt_notifier_unregister(&vcpu->preempt_notifier);
159 mutex_unlock(&vcpu->mutex);
162 static void ack_flush(void *_completed)
166 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
171 struct kvm_vcpu *vcpu;
173 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
176 kvm_for_each_vcpu(i, vcpu, kvm) {
177 kvm_make_request(req, vcpu);
180 /* Set ->requests bit before we read ->mode */
183 if (cpus != NULL && cpu != -1 && cpu != me &&
184 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
185 cpumask_set_cpu(cpu, cpus);
187 if (unlikely(cpus == NULL))
188 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
189 else if (!cpumask_empty(cpus))
190 smp_call_function_many(cpus, ack_flush, NULL, 1);
194 free_cpumask_var(cpus);
198 void kvm_flush_remote_tlbs(struct kvm *kvm)
200 long dirty_count = kvm->tlbs_dirty;
203 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
204 ++kvm->stat.remote_tlb_flush;
205 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
208 void kvm_reload_remote_mmus(struct kvm *kvm)
210 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
213 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
218 mutex_init(&vcpu->mutex);
223 init_waitqueue_head(&vcpu->wq);
224 kvm_async_pf_vcpu_init(vcpu);
226 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
231 vcpu->run = page_address(page);
233 kvm_vcpu_set_in_spin_loop(vcpu, false);
234 kvm_vcpu_set_dy_eligible(vcpu, false);
236 r = kvm_arch_vcpu_init(vcpu);
242 free_page((unsigned long)vcpu->run);
246 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
248 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
251 kvm_arch_vcpu_uninit(vcpu);
252 free_page((unsigned long)vcpu->run);
254 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
256 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
257 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
259 return container_of(mn, struct kvm, mmu_notifier);
262 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
263 struct mm_struct *mm,
264 unsigned long address)
266 struct kvm *kvm = mmu_notifier_to_kvm(mn);
267 int need_tlb_flush, idx;
270 * When ->invalidate_page runs, the linux pte has been zapped
271 * already but the page is still allocated until
272 * ->invalidate_page returns. So if we increase the sequence
273 * here the kvm page fault will notice if the spte can't be
274 * established because the page is going to be freed. If
275 * instead the kvm page fault establishes the spte before
276 * ->invalidate_page runs, kvm_unmap_hva will release it
279 * The sequence increase only need to be seen at spin_unlock
280 * time, and not at spin_lock time.
282 * Increasing the sequence after the spin_unlock would be
283 * unsafe because the kvm page fault could then establish the
284 * pte after kvm_unmap_hva returned, without noticing the page
285 * is going to be freed.
287 idx = srcu_read_lock(&kvm->srcu);
288 spin_lock(&kvm->mmu_lock);
290 kvm->mmu_notifier_seq++;
291 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
292 /* we've to flush the tlb before the pages can be freed */
294 kvm_flush_remote_tlbs(kvm);
296 spin_unlock(&kvm->mmu_lock);
297 srcu_read_unlock(&kvm->srcu, idx);
300 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
301 struct mm_struct *mm,
302 unsigned long address,
305 struct kvm *kvm = mmu_notifier_to_kvm(mn);
308 idx = srcu_read_lock(&kvm->srcu);
309 spin_lock(&kvm->mmu_lock);
310 kvm->mmu_notifier_seq++;
311 kvm_set_spte_hva(kvm, address, pte);
312 spin_unlock(&kvm->mmu_lock);
313 srcu_read_unlock(&kvm->srcu, idx);
316 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
317 struct mm_struct *mm,
321 struct kvm *kvm = mmu_notifier_to_kvm(mn);
322 int need_tlb_flush = 0, idx;
324 idx = srcu_read_lock(&kvm->srcu);
325 spin_lock(&kvm->mmu_lock);
327 * The count increase must become visible at unlock time as no
328 * spte can be established without taking the mmu_lock and
329 * count is also read inside the mmu_lock critical section.
331 kvm->mmu_notifier_count++;
332 need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
333 need_tlb_flush |= kvm->tlbs_dirty;
334 /* we've to flush the tlb before the pages can be freed */
336 kvm_flush_remote_tlbs(kvm);
338 spin_unlock(&kvm->mmu_lock);
339 srcu_read_unlock(&kvm->srcu, idx);
342 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
343 struct mm_struct *mm,
347 struct kvm *kvm = mmu_notifier_to_kvm(mn);
349 spin_lock(&kvm->mmu_lock);
351 * This sequence increase will notify the kvm page fault that
352 * the page that is going to be mapped in the spte could have
355 kvm->mmu_notifier_seq++;
358 * The above sequence increase must be visible before the
359 * below count decrease, which is ensured by the smp_wmb above
360 * in conjunction with the smp_rmb in mmu_notifier_retry().
362 kvm->mmu_notifier_count--;
363 spin_unlock(&kvm->mmu_lock);
365 BUG_ON(kvm->mmu_notifier_count < 0);
368 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
369 struct mm_struct *mm,
370 unsigned long address)
372 struct kvm *kvm = mmu_notifier_to_kvm(mn);
375 idx = srcu_read_lock(&kvm->srcu);
376 spin_lock(&kvm->mmu_lock);
378 young = kvm_age_hva(kvm, address);
380 kvm_flush_remote_tlbs(kvm);
382 spin_unlock(&kvm->mmu_lock);
383 srcu_read_unlock(&kvm->srcu, idx);
388 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
389 struct mm_struct *mm,
390 unsigned long address)
392 struct kvm *kvm = mmu_notifier_to_kvm(mn);
395 idx = srcu_read_lock(&kvm->srcu);
396 spin_lock(&kvm->mmu_lock);
397 young = kvm_test_age_hva(kvm, address);
398 spin_unlock(&kvm->mmu_lock);
399 srcu_read_unlock(&kvm->srcu, idx);
404 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
405 struct mm_struct *mm)
407 struct kvm *kvm = mmu_notifier_to_kvm(mn);
410 idx = srcu_read_lock(&kvm->srcu);
411 kvm_arch_flush_shadow(kvm);
412 srcu_read_unlock(&kvm->srcu, idx);
415 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
416 .invalidate_page = kvm_mmu_notifier_invalidate_page,
417 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
418 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
419 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
420 .test_young = kvm_mmu_notifier_test_young,
421 .change_pte = kvm_mmu_notifier_change_pte,
422 .release = kvm_mmu_notifier_release,
425 static int kvm_init_mmu_notifier(struct kvm *kvm)
427 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
428 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
431 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
433 static int kvm_init_mmu_notifier(struct kvm *kvm)
438 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
440 static void kvm_init_memslots_id(struct kvm *kvm)
443 struct kvm_memslots *slots = kvm->memslots;
445 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
446 slots->id_to_index[i] = slots->memslots[i].id = i;
449 static struct kvm *kvm_create_vm(unsigned long type)
452 struct kvm *kvm = kvm_arch_alloc_vm();
455 return ERR_PTR(-ENOMEM);
457 r = kvm_arch_init_vm(kvm, type);
459 goto out_err_nodisable;
461 r = hardware_enable_all();
463 goto out_err_nodisable;
465 #ifdef CONFIG_HAVE_KVM_IRQCHIP
466 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
467 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
471 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
474 kvm_init_memslots_id(kvm);
475 if (init_srcu_struct(&kvm->srcu))
477 for (i = 0; i < KVM_NR_BUSES; i++) {
478 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
484 spin_lock_init(&kvm->mmu_lock);
485 kvm->mm = current->mm;
486 atomic_inc(&kvm->mm->mm_count);
487 kvm_eventfd_init(kvm);
488 mutex_init(&kvm->lock);
489 mutex_init(&kvm->irq_lock);
490 mutex_init(&kvm->slots_lock);
491 atomic_set(&kvm->users_count, 1);
493 r = kvm_init_mmu_notifier(kvm);
497 raw_spin_lock(&kvm_lock);
498 list_add(&kvm->vm_list, &vm_list);
499 raw_spin_unlock(&kvm_lock);
504 cleanup_srcu_struct(&kvm->srcu);
506 hardware_disable_all();
508 for (i = 0; i < KVM_NR_BUSES; i++)
509 kfree(kvm->buses[i]);
510 kfree(kvm->memslots);
511 kvm_arch_free_vm(kvm);
516 * Avoid using vmalloc for a small buffer.
517 * Should not be used when the size is statically known.
519 void *kvm_kvzalloc(unsigned long size)
521 if (size > PAGE_SIZE)
522 return vzalloc(size);
524 return kzalloc(size, GFP_KERNEL);
527 void kvm_kvfree(const void *addr)
529 if (is_vmalloc_addr(addr))
535 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
537 if (!memslot->dirty_bitmap)
540 kvm_kvfree(memslot->dirty_bitmap);
541 memslot->dirty_bitmap = NULL;
545 * Free any memory in @free but not in @dont.
547 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
548 struct kvm_memory_slot *dont)
550 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
551 kvm_destroy_dirty_bitmap(free);
553 kvm_arch_free_memslot(free, dont);
558 void kvm_free_physmem(struct kvm *kvm)
560 struct kvm_memslots *slots = kvm->memslots;
561 struct kvm_memory_slot *memslot;
563 kvm_for_each_memslot(memslot, slots)
564 kvm_free_physmem_slot(memslot, NULL);
566 kfree(kvm->memslots);
569 static void kvm_destroy_vm(struct kvm *kvm)
572 struct mm_struct *mm = kvm->mm;
574 kvm_arch_sync_events(kvm);
575 raw_spin_lock(&kvm_lock);
576 list_del(&kvm->vm_list);
577 raw_spin_unlock(&kvm_lock);
578 kvm_free_irq_routing(kvm);
579 for (i = 0; i < KVM_NR_BUSES; i++)
580 kvm_io_bus_destroy(kvm->buses[i]);
581 kvm_coalesced_mmio_free(kvm);
582 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
583 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
585 kvm_arch_flush_shadow(kvm);
587 kvm_arch_destroy_vm(kvm);
588 kvm_free_physmem(kvm);
589 cleanup_srcu_struct(&kvm->srcu);
590 kvm_arch_free_vm(kvm);
591 hardware_disable_all();
595 void kvm_get_kvm(struct kvm *kvm)
597 atomic_inc(&kvm->users_count);
599 EXPORT_SYMBOL_GPL(kvm_get_kvm);
601 void kvm_put_kvm(struct kvm *kvm)
603 if (atomic_dec_and_test(&kvm->users_count))
606 EXPORT_SYMBOL_GPL(kvm_put_kvm);
609 static int kvm_vm_release(struct inode *inode, struct file *filp)
611 struct kvm *kvm = filp->private_data;
613 kvm_irqfd_release(kvm);
620 * Allocation size is twice as large as the actual dirty bitmap size.
621 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
623 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
626 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
628 memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
629 if (!memslot->dirty_bitmap)
632 #endif /* !CONFIG_S390 */
636 static int cmp_memslot(const void *slot1, const void *slot2)
638 struct kvm_memory_slot *s1, *s2;
640 s1 = (struct kvm_memory_slot *)slot1;
641 s2 = (struct kvm_memory_slot *)slot2;
643 if (s1->npages < s2->npages)
645 if (s1->npages > s2->npages)
652 * Sort the memslots base on its size, so the larger slots
653 * will get better fit.
655 static void sort_memslots(struct kvm_memslots *slots)
659 sort(slots->memslots, KVM_MEM_SLOTS_NUM,
660 sizeof(struct kvm_memory_slot), cmp_memslot, NULL);
662 for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
663 slots->id_to_index[slots->memslots[i].id] = i;
666 void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
670 struct kvm_memory_slot *old = id_to_memslot(slots, id);
671 unsigned long npages = old->npages;
674 if (new->npages != npages)
675 sort_memslots(slots);
682 * Allocate some memory and give it an address in the guest physical address
685 * Discontiguous memory is allowed, mostly for framebuffers.
687 * Must be called holding mmap_sem for write.
689 int __kvm_set_memory_region(struct kvm *kvm,
690 struct kvm_userspace_memory_region *mem,
695 unsigned long npages;
697 struct kvm_memory_slot *memslot;
698 struct kvm_memory_slot old, new;
699 struct kvm_memslots *slots, *old_memslots;
702 /* General sanity checks */
703 if (mem->memory_size & (PAGE_SIZE - 1))
705 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
707 /* We can read the guest memory with __xxx_user() later on. */
709 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
710 !access_ok(VERIFY_WRITE,
711 (void __user *)(unsigned long)mem->userspace_addr,
714 if (mem->slot >= KVM_MEM_SLOTS_NUM)
716 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
719 memslot = id_to_memslot(kvm->memslots, mem->slot);
720 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
721 npages = mem->memory_size >> PAGE_SHIFT;
724 if (npages > KVM_MEM_MAX_NR_PAGES)
728 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
730 new = old = *memslot;
733 new.base_gfn = base_gfn;
735 new.flags = mem->flags;
737 /* Disallow changing a memory slot's size. */
739 if (npages && old.npages && npages != old.npages)
742 /* Check for overlaps */
744 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
745 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
747 if (s == memslot || !s->npages)
749 if (!((base_gfn + npages <= s->base_gfn) ||
750 (base_gfn >= s->base_gfn + s->npages)))
754 /* Free page dirty bitmap if unneeded */
755 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
756 new.dirty_bitmap = NULL;
760 /* Allocate if a slot is being created */
761 if (npages && !old.npages) {
762 new.user_alloc = user_alloc;
763 new.userspace_addr = mem->userspace_addr;
765 if (kvm_arch_create_memslot(&new, npages))
769 /* Allocate page dirty bitmap if needed */
770 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
771 if (kvm_create_dirty_bitmap(&new) < 0)
773 /* destroy any largepage mappings for dirty tracking */
777 struct kvm_memory_slot *slot;
780 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
784 slot = id_to_memslot(slots, mem->slot);
785 slot->flags |= KVM_MEMSLOT_INVALID;
787 update_memslots(slots, NULL);
789 old_memslots = kvm->memslots;
790 rcu_assign_pointer(kvm->memslots, slots);
791 synchronize_srcu_expedited(&kvm->srcu);
792 /* From this point no new shadow pages pointing to a deleted
793 * memslot will be created.
795 * validation of sp->gfn happens in:
796 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
797 * - kvm_is_visible_gfn (mmu_check_roots)
799 kvm_arch_flush_shadow(kvm);
803 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
807 /* map/unmap the pages in iommu page table */
809 r = kvm_iommu_map_pages(kvm, &new);
813 kvm_iommu_unmap_pages(kvm, &old);
816 slots = kmemdup(kvm->memslots, sizeof(struct kvm_memslots),
821 /* actual memory is freed via old in kvm_free_physmem_slot below */
823 new.dirty_bitmap = NULL;
824 memset(&new.arch, 0, sizeof(new.arch));
827 update_memslots(slots, &new);
828 old_memslots = kvm->memslots;
829 rcu_assign_pointer(kvm->memslots, slots);
830 synchronize_srcu_expedited(&kvm->srcu);
832 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
835 * If the new memory slot is created, we need to clear all
838 if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
839 kvm_arch_flush_shadow(kvm);
841 kvm_free_physmem_slot(&old, &new);
847 kvm_free_physmem_slot(&new, &old);
852 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
854 int kvm_set_memory_region(struct kvm *kvm,
855 struct kvm_userspace_memory_region *mem,
860 mutex_lock(&kvm->slots_lock);
861 r = __kvm_set_memory_region(kvm, mem, user_alloc);
862 mutex_unlock(&kvm->slots_lock);
865 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
867 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
869 kvm_userspace_memory_region *mem,
872 if (mem->slot >= KVM_MEMORY_SLOTS)
874 return kvm_set_memory_region(kvm, mem, user_alloc);
877 int kvm_get_dirty_log(struct kvm *kvm,
878 struct kvm_dirty_log *log, int *is_dirty)
880 struct kvm_memory_slot *memslot;
883 unsigned long any = 0;
886 if (log->slot >= KVM_MEMORY_SLOTS)
889 memslot = id_to_memslot(kvm->memslots, log->slot);
891 if (!memslot->dirty_bitmap)
894 n = kvm_dirty_bitmap_bytes(memslot);
896 for (i = 0; !any && i < n/sizeof(long); ++i)
897 any = memslot->dirty_bitmap[i];
900 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
911 bool kvm_largepages_enabled(void)
913 return largepages_enabled;
916 void kvm_disable_largepages(void)
918 largepages_enabled = false;
920 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
922 static inline unsigned long bad_hva(void)
927 int kvm_is_error_hva(unsigned long addr)
929 return addr == bad_hva();
931 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
933 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
935 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
937 EXPORT_SYMBOL_GPL(gfn_to_memslot);
939 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
941 struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
943 if (!memslot || memslot->id >= KVM_MEMORY_SLOTS ||
944 memslot->flags & KVM_MEMSLOT_INVALID)
949 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
951 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
953 struct vm_area_struct *vma;
954 unsigned long addr, size;
958 addr = gfn_to_hva(kvm, gfn);
959 if (kvm_is_error_hva(addr))
962 down_read(¤t->mm->mmap_sem);
963 vma = find_vma(current->mm, addr);
967 size = vma_kernel_pagesize(vma);
970 up_read(¤t->mm->mmap_sem);
975 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
978 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
982 *nr_pages = slot->npages - (gfn - slot->base_gfn);
984 return gfn_to_hva_memslot(slot, gfn);
987 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
989 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
991 EXPORT_SYMBOL_GPL(gfn_to_hva);
993 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
994 unsigned long start, int write, struct page **page)
996 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1001 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1004 static inline int check_user_page_hwpoison(unsigned long addr)
1006 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1008 rc = __get_user_pages(current, current->mm, addr, 1,
1009 flags, NULL, NULL, NULL);
1010 return rc == -EHWPOISON;
1013 static pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1014 bool write_fault, bool *writable)
1016 struct page *page[1];
1020 /* we can do it either atomically or asynchronously, not both */
1021 BUG_ON(atomic && async);
1023 BUG_ON(!write_fault && !writable);
1028 if (atomic || async)
1029 npages = __get_user_pages_fast(addr, 1, 1, page);
1031 if (unlikely(npages != 1) && !atomic) {
1035 *writable = write_fault;
1038 down_read(¤t->mm->mmap_sem);
1039 npages = get_user_page_nowait(current, current->mm,
1040 addr, write_fault, page);
1041 up_read(¤t->mm->mmap_sem);
1043 npages = get_user_pages_fast(addr, 1, write_fault,
1046 /* map read fault as writable if possible */
1047 if (unlikely(!write_fault) && npages == 1) {
1048 struct page *wpage[1];
1050 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1060 if (unlikely(npages != 1)) {
1061 struct vm_area_struct *vma;
1064 return KVM_PFN_ERR_FAULT;
1066 down_read(¤t->mm->mmap_sem);
1067 if (npages == -EHWPOISON ||
1068 (!async && check_user_page_hwpoison(addr))) {
1069 up_read(¤t->mm->mmap_sem);
1070 return KVM_PFN_ERR_HWPOISON;
1073 vma = find_vma_intersection(current->mm, addr, addr+1);
1076 pfn = KVM_PFN_ERR_FAULT;
1077 else if ((vma->vm_flags & VM_PFNMAP)) {
1078 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1080 BUG_ON(!kvm_is_mmio_pfn(pfn));
1082 if (async && (vma->vm_flags & VM_WRITE))
1084 pfn = KVM_PFN_ERR_FAULT;
1086 up_read(¤t->mm->mmap_sem);
1088 pfn = page_to_pfn(page[0]);
1093 pfn_t hva_to_pfn_atomic(unsigned long addr)
1095 return hva_to_pfn(addr, true, NULL, true, NULL);
1097 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1099 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1100 bool write_fault, bool *writable)
1107 addr = gfn_to_hva(kvm, gfn);
1108 if (kvm_is_error_hva(addr))
1109 return KVM_PFN_ERR_BAD;
1111 return hva_to_pfn(addr, atomic, async, write_fault, writable);
1114 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1116 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1118 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1120 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1121 bool write_fault, bool *writable)
1123 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1125 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1127 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1129 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1131 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1133 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1136 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1138 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1140 pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1142 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1143 return hva_to_pfn(addr, false, NULL, true, NULL);
1146 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1152 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1153 if (kvm_is_error_hva(addr))
1156 if (entry < nr_pages)
1159 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1161 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1163 static struct page *kvm_pfn_to_page(pfn_t pfn)
1165 if (is_error_pfn(pfn))
1166 return KVM_ERR_PTR_BAD_PAGE;
1168 if (kvm_is_mmio_pfn(pfn)) {
1170 return KVM_ERR_PTR_BAD_PAGE;
1173 return pfn_to_page(pfn);
1176 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1180 pfn = gfn_to_pfn(kvm, gfn);
1182 return kvm_pfn_to_page(pfn);
1185 EXPORT_SYMBOL_GPL(gfn_to_page);
1187 void kvm_release_page_clean(struct page *page)
1189 WARN_ON(is_error_page(page));
1191 kvm_release_pfn_clean(page_to_pfn(page));
1193 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1195 void kvm_release_pfn_clean(pfn_t pfn)
1197 WARN_ON(is_error_pfn(pfn));
1199 if (!kvm_is_mmio_pfn(pfn))
1200 put_page(pfn_to_page(pfn));
1202 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1204 void kvm_release_page_dirty(struct page *page)
1206 WARN_ON(is_error_page(page));
1208 kvm_release_pfn_dirty(page_to_pfn(page));
1210 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1212 void kvm_release_pfn_dirty(pfn_t pfn)
1214 kvm_set_pfn_dirty(pfn);
1215 kvm_release_pfn_clean(pfn);
1217 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1219 void kvm_set_page_dirty(struct page *page)
1221 kvm_set_pfn_dirty(page_to_pfn(page));
1223 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1225 void kvm_set_pfn_dirty(pfn_t pfn)
1227 if (!kvm_is_mmio_pfn(pfn)) {
1228 struct page *page = pfn_to_page(pfn);
1229 if (!PageReserved(page))
1233 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1235 void kvm_set_pfn_accessed(pfn_t pfn)
1237 if (!kvm_is_mmio_pfn(pfn))
1238 mark_page_accessed(pfn_to_page(pfn));
1240 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1242 void kvm_get_pfn(pfn_t pfn)
1244 if (!kvm_is_mmio_pfn(pfn))
1245 get_page(pfn_to_page(pfn));
1247 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1249 static int next_segment(unsigned long len, int offset)
1251 if (len > PAGE_SIZE - offset)
1252 return PAGE_SIZE - offset;
1257 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1263 addr = gfn_to_hva(kvm, gfn);
1264 if (kvm_is_error_hva(addr))
1266 r = __copy_from_user(data, (void __user *)addr + offset, len);
1271 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1273 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1275 gfn_t gfn = gpa >> PAGE_SHIFT;
1277 int offset = offset_in_page(gpa);
1280 while ((seg = next_segment(len, offset)) != 0) {
1281 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1291 EXPORT_SYMBOL_GPL(kvm_read_guest);
1293 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1298 gfn_t gfn = gpa >> PAGE_SHIFT;
1299 int offset = offset_in_page(gpa);
1301 addr = gfn_to_hva(kvm, gfn);
1302 if (kvm_is_error_hva(addr))
1304 pagefault_disable();
1305 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1311 EXPORT_SYMBOL(kvm_read_guest_atomic);
1313 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1314 int offset, int len)
1319 addr = gfn_to_hva(kvm, gfn);
1320 if (kvm_is_error_hva(addr))
1322 r = __copy_to_user((void __user *)addr + offset, data, len);
1325 mark_page_dirty(kvm, gfn);
1328 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1330 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1333 gfn_t gfn = gpa >> PAGE_SHIFT;
1335 int offset = offset_in_page(gpa);
1338 while ((seg = next_segment(len, offset)) != 0) {
1339 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1350 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1353 struct kvm_memslots *slots = kvm_memslots(kvm);
1354 int offset = offset_in_page(gpa);
1355 gfn_t gfn = gpa >> PAGE_SHIFT;
1358 ghc->generation = slots->generation;
1359 ghc->memslot = gfn_to_memslot(kvm, gfn);
1360 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1361 if (!kvm_is_error_hva(ghc->hva))
1368 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1370 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1371 void *data, unsigned long len)
1373 struct kvm_memslots *slots = kvm_memslots(kvm);
1376 if (slots->generation != ghc->generation)
1377 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1379 if (kvm_is_error_hva(ghc->hva))
1382 r = __copy_to_user((void __user *)ghc->hva, data, len);
1385 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1389 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1391 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1392 void *data, unsigned long len)
1394 struct kvm_memslots *slots = kvm_memslots(kvm);
1397 if (slots->generation != ghc->generation)
1398 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1400 if (kvm_is_error_hva(ghc->hva))
1403 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1409 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1411 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1413 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1416 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1418 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1420 gfn_t gfn = gpa >> PAGE_SHIFT;
1422 int offset = offset_in_page(gpa);
1425 while ((seg = next_segment(len, offset)) != 0) {
1426 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1435 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1437 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1440 if (memslot && memslot->dirty_bitmap) {
1441 unsigned long rel_gfn = gfn - memslot->base_gfn;
1443 /* TODO: introduce set_bit_le() and use it */
1444 test_and_set_bit_le(rel_gfn, memslot->dirty_bitmap);
1448 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1450 struct kvm_memory_slot *memslot;
1452 memslot = gfn_to_memslot(kvm, gfn);
1453 mark_page_dirty_in_slot(kvm, memslot, gfn);
1457 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1459 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1464 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1466 if (kvm_arch_vcpu_runnable(vcpu)) {
1467 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1470 if (kvm_cpu_has_pending_timer(vcpu))
1472 if (signal_pending(current))
1478 finish_wait(&vcpu->wq, &wait);
1483 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1485 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
1488 int cpu = vcpu->cpu;
1489 wait_queue_head_t *wqp;
1491 wqp = kvm_arch_vcpu_wq(vcpu);
1492 if (waitqueue_active(wqp)) {
1493 wake_up_interruptible(wqp);
1494 ++vcpu->stat.halt_wakeup;
1498 if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
1499 if (kvm_arch_vcpu_should_kick(vcpu))
1500 smp_send_reschedule(cpu);
1503 #endif /* !CONFIG_S390 */
1505 void kvm_resched(struct kvm_vcpu *vcpu)
1507 if (!need_resched())
1511 EXPORT_SYMBOL_GPL(kvm_resched);
1513 bool kvm_vcpu_yield_to(struct kvm_vcpu *target)
1516 struct task_struct *task = NULL;
1519 pid = rcu_dereference(target->pid);
1521 task = get_pid_task(target->pid, PIDTYPE_PID);
1525 if (task->flags & PF_VCPU) {
1526 put_task_struct(task);
1529 if (yield_to(task, 1)) {
1530 put_task_struct(task);
1533 put_task_struct(task);
1536 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
1538 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1540 * Helper that checks whether a VCPU is eligible for directed yield.
1541 * Most eligible candidate to yield is decided by following heuristics:
1543 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1544 * (preempted lock holder), indicated by @in_spin_loop.
1545 * Set at the beiginning and cleared at the end of interception/PLE handler.
1547 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1548 * chance last time (mostly it has become eligible now since we have probably
1549 * yielded to lockholder in last iteration. This is done by toggling
1550 * @dy_eligible each time a VCPU checked for eligibility.)
1552 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1553 * to preempted lock-holder could result in wrong VCPU selection and CPU
1554 * burning. Giving priority for a potential lock-holder increases lock
1557 * Since algorithm is based on heuristics, accessing another VCPU data without
1558 * locking does not harm. It may result in trying to yield to same VCPU, fail
1559 * and continue with next VCPU and so on.
1561 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
1565 eligible = !vcpu->spin_loop.in_spin_loop ||
1566 (vcpu->spin_loop.in_spin_loop &&
1567 vcpu->spin_loop.dy_eligible);
1569 if (vcpu->spin_loop.in_spin_loop)
1570 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
1575 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1577 struct kvm *kvm = me->kvm;
1578 struct kvm_vcpu *vcpu;
1579 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1584 kvm_vcpu_set_in_spin_loop(me, true);
1586 * We boost the priority of a VCPU that is runnable but not
1587 * currently running, because it got preempted by something
1588 * else and called schedule in __vcpu_run. Hopefully that
1589 * VCPU is holding the lock that we need and will release it.
1590 * We approximate round-robin by starting at the last boosted VCPU.
1592 for (pass = 0; pass < 2 && !yielded; pass++) {
1593 kvm_for_each_vcpu(i, vcpu, kvm) {
1594 if (!pass && i <= last_boosted_vcpu) {
1595 i = last_boosted_vcpu;
1597 } else if (pass && i > last_boosted_vcpu)
1601 if (waitqueue_active(&vcpu->wq))
1603 if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
1605 if (kvm_vcpu_yield_to(vcpu)) {
1606 kvm->last_boosted_vcpu = i;
1612 kvm_vcpu_set_in_spin_loop(me, false);
1614 /* Ensure vcpu is not eligible during next spinloop */
1615 kvm_vcpu_set_dy_eligible(me, false);
1617 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1619 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1621 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1624 if (vmf->pgoff == 0)
1625 page = virt_to_page(vcpu->run);
1627 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1628 page = virt_to_page(vcpu->arch.pio_data);
1630 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1631 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1632 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1635 return kvm_arch_vcpu_fault(vcpu, vmf);
1641 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1642 .fault = kvm_vcpu_fault,
1645 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1647 vma->vm_ops = &kvm_vcpu_vm_ops;
1651 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1653 struct kvm_vcpu *vcpu = filp->private_data;
1655 kvm_put_kvm(vcpu->kvm);
1659 static struct file_operations kvm_vcpu_fops = {
1660 .release = kvm_vcpu_release,
1661 .unlocked_ioctl = kvm_vcpu_ioctl,
1662 #ifdef CONFIG_COMPAT
1663 .compat_ioctl = kvm_vcpu_compat_ioctl,
1665 .mmap = kvm_vcpu_mmap,
1666 .llseek = noop_llseek,
1670 * Allocates an inode for the vcpu.
1672 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1674 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1678 * Creates some virtual cpus. Good luck creating more than one.
1680 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1683 struct kvm_vcpu *vcpu, *v;
1685 vcpu = kvm_arch_vcpu_create(kvm, id);
1687 return PTR_ERR(vcpu);
1689 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1691 r = kvm_arch_vcpu_setup(vcpu);
1695 mutex_lock(&kvm->lock);
1696 if (!kvm_vcpu_compatible(vcpu)) {
1698 goto unlock_vcpu_destroy;
1700 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1702 goto unlock_vcpu_destroy;
1705 kvm_for_each_vcpu(r, v, kvm)
1706 if (v->vcpu_id == id) {
1708 goto unlock_vcpu_destroy;
1711 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1713 /* Now it's all set up, let userspace reach it */
1715 r = create_vcpu_fd(vcpu);
1718 goto unlock_vcpu_destroy;
1721 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1723 atomic_inc(&kvm->online_vcpus);
1725 mutex_unlock(&kvm->lock);
1728 unlock_vcpu_destroy:
1729 mutex_unlock(&kvm->lock);
1731 kvm_arch_vcpu_destroy(vcpu);
1735 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1738 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1739 vcpu->sigset_active = 1;
1740 vcpu->sigset = *sigset;
1742 vcpu->sigset_active = 0;
1746 static long kvm_vcpu_ioctl(struct file *filp,
1747 unsigned int ioctl, unsigned long arg)
1749 struct kvm_vcpu *vcpu = filp->private_data;
1750 void __user *argp = (void __user *)arg;
1752 struct kvm_fpu *fpu = NULL;
1753 struct kvm_sregs *kvm_sregs = NULL;
1755 if (vcpu->kvm->mm != current->mm)
1758 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1760 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1761 * so vcpu_load() would break it.
1763 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1764 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1774 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1775 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1777 case KVM_GET_REGS: {
1778 struct kvm_regs *kvm_regs;
1781 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1784 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1788 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1795 case KVM_SET_REGS: {
1796 struct kvm_regs *kvm_regs;
1799 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
1800 if (IS_ERR(kvm_regs)) {
1801 r = PTR_ERR(kvm_regs);
1804 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1812 case KVM_GET_SREGS: {
1813 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1817 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1821 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1826 case KVM_SET_SREGS: {
1827 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
1828 if (IS_ERR(kvm_sregs)) {
1829 r = PTR_ERR(kvm_sregs);
1832 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1838 case KVM_GET_MP_STATE: {
1839 struct kvm_mp_state mp_state;
1841 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1845 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1850 case KVM_SET_MP_STATE: {
1851 struct kvm_mp_state mp_state;
1854 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1856 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1862 case KVM_TRANSLATE: {
1863 struct kvm_translation tr;
1866 if (copy_from_user(&tr, argp, sizeof tr))
1868 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1872 if (copy_to_user(argp, &tr, sizeof tr))
1877 case KVM_SET_GUEST_DEBUG: {
1878 struct kvm_guest_debug dbg;
1881 if (copy_from_user(&dbg, argp, sizeof dbg))
1883 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1889 case KVM_SET_SIGNAL_MASK: {
1890 struct kvm_signal_mask __user *sigmask_arg = argp;
1891 struct kvm_signal_mask kvm_sigmask;
1892 sigset_t sigset, *p;
1897 if (copy_from_user(&kvm_sigmask, argp,
1898 sizeof kvm_sigmask))
1901 if (kvm_sigmask.len != sizeof sigset)
1904 if (copy_from_user(&sigset, sigmask_arg->sigset,
1909 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1913 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1917 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1921 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1927 fpu = memdup_user(argp, sizeof(*fpu));
1932 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1939 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1948 #ifdef CONFIG_COMPAT
1949 static long kvm_vcpu_compat_ioctl(struct file *filp,
1950 unsigned int ioctl, unsigned long arg)
1952 struct kvm_vcpu *vcpu = filp->private_data;
1953 void __user *argp = compat_ptr(arg);
1956 if (vcpu->kvm->mm != current->mm)
1960 case KVM_SET_SIGNAL_MASK: {
1961 struct kvm_signal_mask __user *sigmask_arg = argp;
1962 struct kvm_signal_mask kvm_sigmask;
1963 compat_sigset_t csigset;
1968 if (copy_from_user(&kvm_sigmask, argp,
1969 sizeof kvm_sigmask))
1972 if (kvm_sigmask.len != sizeof csigset)
1975 if (copy_from_user(&csigset, sigmask_arg->sigset,
1979 sigset_from_compat(&sigset, &csigset);
1980 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1984 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1992 static long kvm_vm_ioctl(struct file *filp,
1993 unsigned int ioctl, unsigned long arg)
1995 struct kvm *kvm = filp->private_data;
1996 void __user *argp = (void __user *)arg;
1999 if (kvm->mm != current->mm)
2002 case KVM_CREATE_VCPU:
2003 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2007 case KVM_SET_USER_MEMORY_REGION: {
2008 struct kvm_userspace_memory_region kvm_userspace_mem;
2011 if (copy_from_user(&kvm_userspace_mem, argp,
2012 sizeof kvm_userspace_mem))
2015 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
2020 case KVM_GET_DIRTY_LOG: {
2021 struct kvm_dirty_log log;
2024 if (copy_from_user(&log, argp, sizeof log))
2026 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2031 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2032 case KVM_REGISTER_COALESCED_MMIO: {
2033 struct kvm_coalesced_mmio_zone zone;
2035 if (copy_from_user(&zone, argp, sizeof zone))
2037 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2043 case KVM_UNREGISTER_COALESCED_MMIO: {
2044 struct kvm_coalesced_mmio_zone zone;
2046 if (copy_from_user(&zone, argp, sizeof zone))
2048 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2056 struct kvm_irqfd data;
2059 if (copy_from_user(&data, argp, sizeof data))
2061 r = kvm_irqfd(kvm, &data);
2064 case KVM_IOEVENTFD: {
2065 struct kvm_ioeventfd data;
2068 if (copy_from_user(&data, argp, sizeof data))
2070 r = kvm_ioeventfd(kvm, &data);
2073 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2074 case KVM_SET_BOOT_CPU_ID:
2076 mutex_lock(&kvm->lock);
2077 if (atomic_read(&kvm->online_vcpus) != 0)
2080 kvm->bsp_vcpu_id = arg;
2081 mutex_unlock(&kvm->lock);
2084 #ifdef CONFIG_HAVE_KVM_MSI
2085 case KVM_SIGNAL_MSI: {
2089 if (copy_from_user(&msi, argp, sizeof msi))
2091 r = kvm_send_userspace_msi(kvm, &msi);
2095 #ifdef __KVM_HAVE_IRQ_LINE
2096 case KVM_IRQ_LINE_STATUS:
2097 case KVM_IRQ_LINE: {
2098 struct kvm_irq_level irq_event;
2101 if (copy_from_user(&irq_event, argp, sizeof irq_event))
2104 r = kvm_vm_ioctl_irq_line(kvm, &irq_event);
2109 if (ioctl == KVM_IRQ_LINE_STATUS) {
2110 if (copy_to_user(argp, &irq_event, sizeof irq_event))
2119 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2121 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2127 #ifdef CONFIG_COMPAT
2128 struct compat_kvm_dirty_log {
2132 compat_uptr_t dirty_bitmap; /* one bit per page */
2137 static long kvm_vm_compat_ioctl(struct file *filp,
2138 unsigned int ioctl, unsigned long arg)
2140 struct kvm *kvm = filp->private_data;
2143 if (kvm->mm != current->mm)
2146 case KVM_GET_DIRTY_LOG: {
2147 struct compat_kvm_dirty_log compat_log;
2148 struct kvm_dirty_log log;
2151 if (copy_from_user(&compat_log, (void __user *)arg,
2152 sizeof(compat_log)))
2154 log.slot = compat_log.slot;
2155 log.padding1 = compat_log.padding1;
2156 log.padding2 = compat_log.padding2;
2157 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2159 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2165 r = kvm_vm_ioctl(filp, ioctl, arg);
2173 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2175 struct page *page[1];
2178 gfn_t gfn = vmf->pgoff;
2179 struct kvm *kvm = vma->vm_file->private_data;
2181 addr = gfn_to_hva(kvm, gfn);
2182 if (kvm_is_error_hva(addr))
2183 return VM_FAULT_SIGBUS;
2185 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2187 if (unlikely(npages != 1))
2188 return VM_FAULT_SIGBUS;
2190 vmf->page = page[0];
2194 static const struct vm_operations_struct kvm_vm_vm_ops = {
2195 .fault = kvm_vm_fault,
2198 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2200 vma->vm_ops = &kvm_vm_vm_ops;
2204 static struct file_operations kvm_vm_fops = {
2205 .release = kvm_vm_release,
2206 .unlocked_ioctl = kvm_vm_ioctl,
2207 #ifdef CONFIG_COMPAT
2208 .compat_ioctl = kvm_vm_compat_ioctl,
2210 .mmap = kvm_vm_mmap,
2211 .llseek = noop_llseek,
2214 static int kvm_dev_ioctl_create_vm(unsigned long type)
2219 kvm = kvm_create_vm(type);
2221 return PTR_ERR(kvm);
2222 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2223 r = kvm_coalesced_mmio_init(kvm);
2229 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2236 static long kvm_dev_ioctl_check_extension_generic(long arg)
2239 case KVM_CAP_USER_MEMORY:
2240 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2241 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2242 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2243 case KVM_CAP_SET_BOOT_CPU_ID:
2245 case KVM_CAP_INTERNAL_ERROR_DATA:
2246 #ifdef CONFIG_HAVE_KVM_MSI
2247 case KVM_CAP_SIGNAL_MSI:
2250 #ifdef KVM_CAP_IRQ_ROUTING
2251 case KVM_CAP_IRQ_ROUTING:
2252 return KVM_MAX_IRQ_ROUTES;
2257 return kvm_dev_ioctl_check_extension(arg);
2260 static long kvm_dev_ioctl(struct file *filp,
2261 unsigned int ioctl, unsigned long arg)
2266 case KVM_GET_API_VERSION:
2270 r = KVM_API_VERSION;
2273 r = kvm_dev_ioctl_create_vm(arg);
2275 case KVM_CHECK_EXTENSION:
2276 r = kvm_dev_ioctl_check_extension_generic(arg);
2278 case KVM_GET_VCPU_MMAP_SIZE:
2282 r = PAGE_SIZE; /* struct kvm_run */
2284 r += PAGE_SIZE; /* pio data page */
2286 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2287 r += PAGE_SIZE; /* coalesced mmio ring page */
2290 case KVM_TRACE_ENABLE:
2291 case KVM_TRACE_PAUSE:
2292 case KVM_TRACE_DISABLE:
2296 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2302 static struct file_operations kvm_chardev_ops = {
2303 .unlocked_ioctl = kvm_dev_ioctl,
2304 .compat_ioctl = kvm_dev_ioctl,
2305 .llseek = noop_llseek,
2308 static struct miscdevice kvm_dev = {
2314 static void hardware_enable_nolock(void *junk)
2316 int cpu = raw_smp_processor_id();
2319 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2322 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2324 r = kvm_arch_hardware_enable(NULL);
2327 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2328 atomic_inc(&hardware_enable_failed);
2329 printk(KERN_INFO "kvm: enabling virtualization on "
2330 "CPU%d failed\n", cpu);
2334 static void hardware_enable(void *junk)
2336 raw_spin_lock(&kvm_lock);
2337 hardware_enable_nolock(junk);
2338 raw_spin_unlock(&kvm_lock);
2341 static void hardware_disable_nolock(void *junk)
2343 int cpu = raw_smp_processor_id();
2345 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2347 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2348 kvm_arch_hardware_disable(NULL);
2351 static void hardware_disable(void *junk)
2353 raw_spin_lock(&kvm_lock);
2354 hardware_disable_nolock(junk);
2355 raw_spin_unlock(&kvm_lock);
2358 static void hardware_disable_all_nolock(void)
2360 BUG_ON(!kvm_usage_count);
2363 if (!kvm_usage_count)
2364 on_each_cpu(hardware_disable_nolock, NULL, 1);
2367 static void hardware_disable_all(void)
2369 raw_spin_lock(&kvm_lock);
2370 hardware_disable_all_nolock();
2371 raw_spin_unlock(&kvm_lock);
2374 static int hardware_enable_all(void)
2378 raw_spin_lock(&kvm_lock);
2381 if (kvm_usage_count == 1) {
2382 atomic_set(&hardware_enable_failed, 0);
2383 on_each_cpu(hardware_enable_nolock, NULL, 1);
2385 if (atomic_read(&hardware_enable_failed)) {
2386 hardware_disable_all_nolock();
2391 raw_spin_unlock(&kvm_lock);
2396 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2401 if (!kvm_usage_count)
2404 val &= ~CPU_TASKS_FROZEN;
2407 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2409 hardware_disable(NULL);
2412 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2414 hardware_enable(NULL);
2421 asmlinkage void kvm_spurious_fault(void)
2423 /* Fault while not rebooting. We want the trace. */
2426 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2428 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2432 * Some (well, at least mine) BIOSes hang on reboot if
2435 * And Intel TXT required VMX off for all cpu when system shutdown.
2437 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2438 kvm_rebooting = true;
2439 on_each_cpu(hardware_disable_nolock, NULL, 1);
2443 static struct notifier_block kvm_reboot_notifier = {
2444 .notifier_call = kvm_reboot,
2448 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2452 for (i = 0; i < bus->dev_count; i++) {
2453 struct kvm_io_device *pos = bus->range[i].dev;
2455 kvm_iodevice_destructor(pos);
2460 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2462 const struct kvm_io_range *r1 = p1;
2463 const struct kvm_io_range *r2 = p2;
2465 if (r1->addr < r2->addr)
2467 if (r1->addr + r1->len > r2->addr + r2->len)
2472 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2473 gpa_t addr, int len)
2475 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2481 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2482 kvm_io_bus_sort_cmp, NULL);
2487 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2488 gpa_t addr, int len)
2490 struct kvm_io_range *range, key;
2493 key = (struct kvm_io_range) {
2498 range = bsearch(&key, bus->range, bus->dev_count,
2499 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2503 off = range - bus->range;
2505 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2511 /* kvm_io_bus_write - called under kvm->slots_lock */
2512 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2513 int len, const void *val)
2516 struct kvm_io_bus *bus;
2517 struct kvm_io_range range;
2519 range = (struct kvm_io_range) {
2524 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2525 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2529 while (idx < bus->dev_count &&
2530 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2531 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2539 /* kvm_io_bus_read - called under kvm->slots_lock */
2540 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2544 struct kvm_io_bus *bus;
2545 struct kvm_io_range range;
2547 range = (struct kvm_io_range) {
2552 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2553 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2557 while (idx < bus->dev_count &&
2558 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2559 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2567 /* Caller must hold slots_lock. */
2568 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2569 int len, struct kvm_io_device *dev)
2571 struct kvm_io_bus *new_bus, *bus;
2573 bus = kvm->buses[bus_idx];
2574 if (bus->dev_count > NR_IOBUS_DEVS - 1)
2577 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count + 1) *
2578 sizeof(struct kvm_io_range)), GFP_KERNEL);
2581 memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
2582 sizeof(struct kvm_io_range)));
2583 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2584 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2585 synchronize_srcu_expedited(&kvm->srcu);
2591 /* Caller must hold slots_lock. */
2592 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2593 struct kvm_io_device *dev)
2596 struct kvm_io_bus *new_bus, *bus;
2598 bus = kvm->buses[bus_idx];
2600 for (i = 0; i < bus->dev_count; i++)
2601 if (bus->range[i].dev == dev) {
2609 new_bus = kzalloc(sizeof(*bus) + ((bus->dev_count - 1) *
2610 sizeof(struct kvm_io_range)), GFP_KERNEL);
2614 memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
2615 new_bus->dev_count--;
2616 memcpy(new_bus->range + i, bus->range + i + 1,
2617 (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
2619 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2620 synchronize_srcu_expedited(&kvm->srcu);
2625 static struct notifier_block kvm_cpu_notifier = {
2626 .notifier_call = kvm_cpu_hotplug,
2629 static int vm_stat_get(void *_offset, u64 *val)
2631 unsigned offset = (long)_offset;
2635 raw_spin_lock(&kvm_lock);
2636 list_for_each_entry(kvm, &vm_list, vm_list)
2637 *val += *(u32 *)((void *)kvm + offset);
2638 raw_spin_unlock(&kvm_lock);
2642 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2644 static int vcpu_stat_get(void *_offset, u64 *val)
2646 unsigned offset = (long)_offset;
2648 struct kvm_vcpu *vcpu;
2652 raw_spin_lock(&kvm_lock);
2653 list_for_each_entry(kvm, &vm_list, vm_list)
2654 kvm_for_each_vcpu(i, vcpu, kvm)
2655 *val += *(u32 *)((void *)vcpu + offset);
2657 raw_spin_unlock(&kvm_lock);
2661 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2663 static const struct file_operations *stat_fops[] = {
2664 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2665 [KVM_STAT_VM] = &vm_stat_fops,
2668 static int kvm_init_debug(void)
2671 struct kvm_stats_debugfs_item *p;
2673 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2674 if (kvm_debugfs_dir == NULL)
2677 for (p = debugfs_entries; p->name; ++p) {
2678 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2679 (void *)(long)p->offset,
2680 stat_fops[p->kind]);
2681 if (p->dentry == NULL)
2688 debugfs_remove_recursive(kvm_debugfs_dir);
2693 static void kvm_exit_debug(void)
2695 struct kvm_stats_debugfs_item *p;
2697 for (p = debugfs_entries; p->name; ++p)
2698 debugfs_remove(p->dentry);
2699 debugfs_remove(kvm_debugfs_dir);
2702 static int kvm_suspend(void)
2704 if (kvm_usage_count)
2705 hardware_disable_nolock(NULL);
2709 static void kvm_resume(void)
2711 if (kvm_usage_count) {
2712 WARN_ON(raw_spin_is_locked(&kvm_lock));
2713 hardware_enable_nolock(NULL);
2717 static struct syscore_ops kvm_syscore_ops = {
2718 .suspend = kvm_suspend,
2719 .resume = kvm_resume,
2723 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2725 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2728 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2730 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2732 kvm_arch_vcpu_load(vcpu, cpu);
2735 static void kvm_sched_out(struct preempt_notifier *pn,
2736 struct task_struct *next)
2738 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2740 kvm_arch_vcpu_put(vcpu);
2743 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2744 struct module *module)
2749 r = kvm_arch_init(opaque);
2753 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2758 r = kvm_arch_hardware_setup();
2762 for_each_online_cpu(cpu) {
2763 smp_call_function_single(cpu,
2764 kvm_arch_check_processor_compat,
2770 r = register_cpu_notifier(&kvm_cpu_notifier);
2773 register_reboot_notifier(&kvm_reboot_notifier);
2775 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2777 vcpu_align = __alignof__(struct kvm_vcpu);
2778 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2780 if (!kvm_vcpu_cache) {
2785 r = kvm_async_pf_init();
2789 kvm_chardev_ops.owner = module;
2790 kvm_vm_fops.owner = module;
2791 kvm_vcpu_fops.owner = module;
2793 r = misc_register(&kvm_dev);
2795 printk(KERN_ERR "kvm: misc device register failed\n");
2799 register_syscore_ops(&kvm_syscore_ops);
2801 kvm_preempt_ops.sched_in = kvm_sched_in;
2802 kvm_preempt_ops.sched_out = kvm_sched_out;
2804 r = kvm_init_debug();
2806 printk(KERN_ERR "kvm: create debugfs files failed\n");
2813 unregister_syscore_ops(&kvm_syscore_ops);
2815 kvm_async_pf_deinit();
2817 kmem_cache_destroy(kvm_vcpu_cache);
2819 unregister_reboot_notifier(&kvm_reboot_notifier);
2820 unregister_cpu_notifier(&kvm_cpu_notifier);
2823 kvm_arch_hardware_unsetup();
2825 free_cpumask_var(cpus_hardware_enabled);
2831 EXPORT_SYMBOL_GPL(kvm_init);
2836 misc_deregister(&kvm_dev);
2837 kmem_cache_destroy(kvm_vcpu_cache);
2838 kvm_async_pf_deinit();
2839 unregister_syscore_ops(&kvm_syscore_ops);
2840 unregister_reboot_notifier(&kvm_reboot_notifier);
2841 unregister_cpu_notifier(&kvm_cpu_notifier);
2842 on_each_cpu(hardware_disable_nolock, NULL, 1);
2843 kvm_arch_hardware_unsetup();
2845 free_cpumask_var(cpus_hardware_enabled);
2847 EXPORT_SYMBOL_GPL(kvm_exit);