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 static struct page *hwpoison_page;
104 static pfn_t hwpoison_pfn;
106 struct page *fault_page;
109 inline int kvm_is_mmio_pfn(pfn_t pfn)
111 if (pfn_valid(pfn)) {
113 struct page *tail = pfn_to_page(pfn);
114 struct page *head = compound_trans_head(tail);
115 reserved = PageReserved(head);
118 * "head" is not a dangling pointer
119 * (compound_trans_head takes care of that)
120 * but the hugepage may have been splitted
121 * from under us (and we may not hold a
122 * reference count on the head page so it can
123 * be reused before we run PageReferenced), so
124 * we've to check PageTail before returning
131 return PageReserved(tail);
138 * Switches to specified vcpu, until a matching vcpu_put()
140 void vcpu_load(struct kvm_vcpu *vcpu)
144 mutex_lock(&vcpu->mutex);
145 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
146 /* The thread running this VCPU changed. */
147 struct pid *oldpid = vcpu->pid;
148 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
149 rcu_assign_pointer(vcpu->pid, newpid);
154 preempt_notifier_register(&vcpu->preempt_notifier);
155 kvm_arch_vcpu_load(vcpu, cpu);
159 void vcpu_put(struct kvm_vcpu *vcpu)
162 kvm_arch_vcpu_put(vcpu);
163 preempt_notifier_unregister(&vcpu->preempt_notifier);
165 mutex_unlock(&vcpu->mutex);
168 static void ack_flush(void *_completed)
172 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
177 struct kvm_vcpu *vcpu;
179 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
182 kvm_for_each_vcpu(i, vcpu, kvm) {
183 kvm_make_request(req, vcpu);
186 /* Set ->requests bit before we read ->mode */
189 if (cpus != NULL && cpu != -1 && cpu != me &&
190 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
191 cpumask_set_cpu(cpu, cpus);
193 if (unlikely(cpus == NULL))
194 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
195 else if (!cpumask_empty(cpus))
196 smp_call_function_many(cpus, ack_flush, NULL, 1);
200 free_cpumask_var(cpus);
204 void kvm_flush_remote_tlbs(struct kvm *kvm)
206 int dirty_count = kvm->tlbs_dirty;
209 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
210 ++kvm->stat.remote_tlb_flush;
211 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
214 void kvm_reload_remote_mmus(struct kvm *kvm)
216 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
219 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
224 mutex_init(&vcpu->mutex);
229 init_waitqueue_head(&vcpu->wq);
230 kvm_async_pf_vcpu_init(vcpu);
232 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
237 vcpu->run = page_address(page);
239 r = kvm_arch_vcpu_init(vcpu);
245 free_page((unsigned long)vcpu->run);
249 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
251 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
254 kvm_arch_vcpu_uninit(vcpu);
255 free_page((unsigned long)vcpu->run);
257 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
259 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
260 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
262 return container_of(mn, struct kvm, mmu_notifier);
265 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
266 struct mm_struct *mm,
267 unsigned long address)
269 struct kvm *kvm = mmu_notifier_to_kvm(mn);
270 int need_tlb_flush, idx;
273 * When ->invalidate_page runs, the linux pte has been zapped
274 * already but the page is still allocated until
275 * ->invalidate_page returns. So if we increase the sequence
276 * here the kvm page fault will notice if the spte can't be
277 * established because the page is going to be freed. If
278 * instead the kvm page fault establishes the spte before
279 * ->invalidate_page runs, kvm_unmap_hva will release it
282 * The sequence increase only need to be seen at spin_unlock
283 * time, and not at spin_lock time.
285 * Increasing the sequence after the spin_unlock would be
286 * unsafe because the kvm page fault could then establish the
287 * pte after kvm_unmap_hva returned, without noticing the page
288 * is going to be freed.
290 idx = srcu_read_lock(&kvm->srcu);
291 spin_lock(&kvm->mmu_lock);
293 kvm->mmu_notifier_seq++;
294 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
295 /* we've to flush the tlb before the pages can be freed */
297 kvm_flush_remote_tlbs(kvm);
299 spin_unlock(&kvm->mmu_lock);
300 srcu_read_unlock(&kvm->srcu, idx);
303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
304 struct mm_struct *mm,
305 unsigned long address,
308 struct kvm *kvm = mmu_notifier_to_kvm(mn);
311 idx = srcu_read_lock(&kvm->srcu);
312 spin_lock(&kvm->mmu_lock);
313 kvm->mmu_notifier_seq++;
314 kvm_set_spte_hva(kvm, address, pte);
315 spin_unlock(&kvm->mmu_lock);
316 srcu_read_unlock(&kvm->srcu, idx);
319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
320 struct mm_struct *mm,
324 struct kvm *kvm = mmu_notifier_to_kvm(mn);
325 int need_tlb_flush = 0, idx;
327 idx = srcu_read_lock(&kvm->srcu);
328 spin_lock(&kvm->mmu_lock);
330 * The count increase must become visible at unlock time as no
331 * spte can be established without taking the mmu_lock and
332 * count is also read inside the mmu_lock critical section.
334 kvm->mmu_notifier_count++;
335 for (; start < end; start += PAGE_SIZE)
336 need_tlb_flush |= kvm_unmap_hva(kvm, start);
337 need_tlb_flush |= kvm->tlbs_dirty;
338 /* we've to flush the tlb before the pages can be freed */
340 kvm_flush_remote_tlbs(kvm);
342 spin_unlock(&kvm->mmu_lock);
343 srcu_read_unlock(&kvm->srcu, idx);
346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
347 struct mm_struct *mm,
351 struct kvm *kvm = mmu_notifier_to_kvm(mn);
353 spin_lock(&kvm->mmu_lock);
355 * This sequence increase will notify the kvm page fault that
356 * the page that is going to be mapped in the spte could have
359 kvm->mmu_notifier_seq++;
361 * The above sequence increase must be visible before the
362 * below count decrease but both values are read by the kvm
363 * page fault under mmu_lock spinlock so we don't need to add
364 * a smb_wmb() here in between the two.
366 kvm->mmu_notifier_count--;
367 spin_unlock(&kvm->mmu_lock);
369 BUG_ON(kvm->mmu_notifier_count < 0);
372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
373 struct mm_struct *mm,
374 unsigned long address)
376 struct kvm *kvm = mmu_notifier_to_kvm(mn);
379 idx = srcu_read_lock(&kvm->srcu);
380 spin_lock(&kvm->mmu_lock);
382 young = kvm_age_hva(kvm, address);
384 kvm_flush_remote_tlbs(kvm);
386 spin_unlock(&kvm->mmu_lock);
387 srcu_read_unlock(&kvm->srcu, idx);
392 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
393 struct mm_struct *mm,
394 unsigned long address)
396 struct kvm *kvm = mmu_notifier_to_kvm(mn);
399 idx = srcu_read_lock(&kvm->srcu);
400 spin_lock(&kvm->mmu_lock);
401 young = kvm_test_age_hva(kvm, address);
402 spin_unlock(&kvm->mmu_lock);
403 srcu_read_unlock(&kvm->srcu, idx);
408 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
409 struct mm_struct *mm)
411 struct kvm *kvm = mmu_notifier_to_kvm(mn);
414 idx = srcu_read_lock(&kvm->srcu);
415 kvm_arch_flush_shadow(kvm);
416 srcu_read_unlock(&kvm->srcu, idx);
419 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
420 .invalidate_page = kvm_mmu_notifier_invalidate_page,
421 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
422 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
423 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
424 .test_young = kvm_mmu_notifier_test_young,
425 .change_pte = kvm_mmu_notifier_change_pte,
426 .release = kvm_mmu_notifier_release,
429 static int kvm_init_mmu_notifier(struct kvm *kvm)
431 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
432 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
435 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
437 static int kvm_init_mmu_notifier(struct kvm *kvm)
442 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
444 static struct kvm *kvm_create_vm(void)
447 struct kvm *kvm = kvm_arch_alloc_vm();
450 return ERR_PTR(-ENOMEM);
452 r = kvm_arch_init_vm(kvm);
454 goto out_err_nodisable;
456 r = hardware_enable_all();
458 goto out_err_nodisable;
460 #ifdef CONFIG_HAVE_KVM_IRQCHIP
461 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
462 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
466 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
469 if (init_srcu_struct(&kvm->srcu))
471 for (i = 0; i < KVM_NR_BUSES; i++) {
472 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
478 spin_lock_init(&kvm->mmu_lock);
479 kvm->mm = current->mm;
480 atomic_inc(&kvm->mm->mm_count);
481 kvm_eventfd_init(kvm);
482 mutex_init(&kvm->lock);
483 mutex_init(&kvm->irq_lock);
484 mutex_init(&kvm->slots_lock);
485 atomic_set(&kvm->users_count, 1);
487 r = kvm_init_mmu_notifier(kvm);
491 raw_spin_lock(&kvm_lock);
492 list_add(&kvm->vm_list, &vm_list);
493 raw_spin_unlock(&kvm_lock);
498 cleanup_srcu_struct(&kvm->srcu);
500 hardware_disable_all();
502 for (i = 0; i < KVM_NR_BUSES; i++)
503 kfree(kvm->buses[i]);
504 kfree(kvm->memslots);
505 kvm_arch_free_vm(kvm);
509 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
511 if (!memslot->dirty_bitmap)
514 if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
515 vfree(memslot->dirty_bitmap_head);
517 kfree(memslot->dirty_bitmap_head);
519 memslot->dirty_bitmap = NULL;
520 memslot->dirty_bitmap_head = NULL;
524 * Free any memory in @free but not in @dont.
526 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
527 struct kvm_memory_slot *dont)
531 if (!dont || free->rmap != dont->rmap)
534 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
535 kvm_destroy_dirty_bitmap(free);
538 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
539 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
540 vfree(free->lpage_info[i]);
541 free->lpage_info[i] = NULL;
549 void kvm_free_physmem(struct kvm *kvm)
552 struct kvm_memslots *slots = kvm->memslots;
554 for (i = 0; i < slots->nmemslots; ++i)
555 kvm_free_physmem_slot(&slots->memslots[i], NULL);
557 kfree(kvm->memslots);
560 static void kvm_destroy_vm(struct kvm *kvm)
563 struct mm_struct *mm = kvm->mm;
565 kvm_arch_sync_events(kvm);
566 raw_spin_lock(&kvm_lock);
567 list_del(&kvm->vm_list);
568 raw_spin_unlock(&kvm_lock);
569 kvm_free_irq_routing(kvm);
570 for (i = 0; i < KVM_NR_BUSES; i++)
571 kvm_io_bus_destroy(kvm->buses[i]);
572 kvm_coalesced_mmio_free(kvm);
573 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
574 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
576 kvm_arch_flush_shadow(kvm);
578 kvm_arch_destroy_vm(kvm);
579 kvm_free_physmem(kvm);
580 cleanup_srcu_struct(&kvm->srcu);
581 kvm_arch_free_vm(kvm);
582 hardware_disable_all();
586 void kvm_get_kvm(struct kvm *kvm)
588 atomic_inc(&kvm->users_count);
590 EXPORT_SYMBOL_GPL(kvm_get_kvm);
592 void kvm_put_kvm(struct kvm *kvm)
594 if (atomic_dec_and_test(&kvm->users_count))
597 EXPORT_SYMBOL_GPL(kvm_put_kvm);
600 static int kvm_vm_release(struct inode *inode, struct file *filp)
602 struct kvm *kvm = filp->private_data;
604 kvm_irqfd_release(kvm);
612 * Allocation size is twice as large as the actual dirty bitmap size.
613 * This makes it possible to do double buffering: see x86's
614 * kvm_vm_ioctl_get_dirty_log().
616 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
618 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
620 if (dirty_bytes > PAGE_SIZE)
621 memslot->dirty_bitmap = vzalloc(dirty_bytes);
623 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
625 if (!memslot->dirty_bitmap)
628 memslot->dirty_bitmap_head = memslot->dirty_bitmap;
631 #endif /* !CONFIG_S390 */
634 * Allocate some memory and give it an address in the guest physical address
637 * Discontiguous memory is allowed, mostly for framebuffers.
639 * Must be called holding mmap_sem for write.
641 int __kvm_set_memory_region(struct kvm *kvm,
642 struct kvm_userspace_memory_region *mem,
647 unsigned long npages;
649 struct kvm_memory_slot *memslot;
650 struct kvm_memory_slot old, new;
651 struct kvm_memslots *slots, *old_memslots;
654 /* General sanity checks */
655 if (mem->memory_size & (PAGE_SIZE - 1))
657 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
659 /* We can read the guest memory with __xxx_user() later on. */
661 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
662 !access_ok(VERIFY_WRITE,
663 (void __user *)(unsigned long)mem->userspace_addr,
666 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
668 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
671 memslot = &kvm->memslots->memslots[mem->slot];
672 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
673 npages = mem->memory_size >> PAGE_SHIFT;
676 if (npages > KVM_MEM_MAX_NR_PAGES)
680 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
682 new = old = *memslot;
685 new.base_gfn = base_gfn;
687 new.flags = mem->flags;
689 /* Disallow changing a memory slot's size. */
691 if (npages && old.npages && npages != old.npages)
694 /* Check for overlaps */
696 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
697 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
699 if (s == memslot || !s->npages)
701 if (!((base_gfn + npages <= s->base_gfn) ||
702 (base_gfn >= s->base_gfn + s->npages)))
706 /* Free page dirty bitmap if unneeded */
707 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
708 new.dirty_bitmap = NULL;
712 /* Allocate if a slot is being created */
714 if (npages && !new.rmap) {
715 new.rmap = vzalloc(npages * sizeof(*new.rmap));
720 new.user_alloc = user_alloc;
721 new.userspace_addr = mem->userspace_addr;
726 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
732 /* Avoid unused variable warning if no large pages */
735 if (new.lpage_info[i])
738 lpages = 1 + ((base_gfn + npages - 1)
739 >> KVM_HPAGE_GFN_SHIFT(level));
740 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
742 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
744 if (!new.lpage_info[i])
747 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
748 new.lpage_info[i][0].write_count = 1;
749 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
750 new.lpage_info[i][lpages - 1].write_count = 1;
751 ugfn = new.userspace_addr >> PAGE_SHIFT;
753 * If the gfn and userspace address are not aligned wrt each
754 * other, or if explicitly asked to, disable large page
755 * support for this slot
757 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
759 for (j = 0; j < lpages; ++j)
760 new.lpage_info[i][j].write_count = 1;
765 /* Allocate page dirty bitmap if needed */
766 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
767 if (kvm_create_dirty_bitmap(&new) < 0)
769 /* destroy any largepage mappings for dirty tracking */
771 #else /* not defined CONFIG_S390 */
772 new.user_alloc = user_alloc;
774 new.userspace_addr = mem->userspace_addr;
775 #endif /* not defined CONFIG_S390 */
779 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
782 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
783 if (mem->slot >= slots->nmemslots)
784 slots->nmemslots = mem->slot + 1;
786 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
788 old_memslots = kvm->memslots;
789 rcu_assign_pointer(kvm->memslots, slots);
790 synchronize_srcu_expedited(&kvm->srcu);
791 /* From this point no new shadow pages pointing to a deleted
792 * memslot will be created.
794 * validation of sp->gfn happens in:
795 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
796 * - kvm_is_visible_gfn (mmu_check_roots)
798 kvm_arch_flush_shadow(kvm);
802 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
806 /* map/unmap the pages in iommu page table */
808 r = kvm_iommu_map_pages(kvm, &new);
812 kvm_iommu_unmap_pages(kvm, &old);
815 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
818 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
819 if (mem->slot >= slots->nmemslots)
820 slots->nmemslots = mem->slot + 1;
823 /* actual memory is freed via old in kvm_free_physmem_slot below */
826 new.dirty_bitmap = NULL;
827 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
828 new.lpage_info[i] = NULL;
831 slots->memslots[mem->slot] = new;
832 old_memslots = kvm->memslots;
833 rcu_assign_pointer(kvm->memslots, slots);
834 synchronize_srcu_expedited(&kvm->srcu);
836 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
839 * If the new memory slot is created, we need to clear all
842 if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
843 kvm_arch_flush_shadow(kvm);
845 kvm_free_physmem_slot(&old, &new);
851 kvm_free_physmem_slot(&new, &old);
856 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
858 int kvm_set_memory_region(struct kvm *kvm,
859 struct kvm_userspace_memory_region *mem,
864 mutex_lock(&kvm->slots_lock);
865 r = __kvm_set_memory_region(kvm, mem, user_alloc);
866 mutex_unlock(&kvm->slots_lock);
869 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
871 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
873 kvm_userspace_memory_region *mem,
876 if (mem->slot >= KVM_MEMORY_SLOTS)
878 return kvm_set_memory_region(kvm, mem, user_alloc);
881 int kvm_get_dirty_log(struct kvm *kvm,
882 struct kvm_dirty_log *log, int *is_dirty)
884 struct kvm_memory_slot *memslot;
887 unsigned long any = 0;
890 if (log->slot >= KVM_MEMORY_SLOTS)
893 memslot = &kvm->memslots->memslots[log->slot];
895 if (!memslot->dirty_bitmap)
898 n = kvm_dirty_bitmap_bytes(memslot);
900 for (i = 0; !any && i < n/sizeof(long); ++i)
901 any = memslot->dirty_bitmap[i];
904 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
915 void kvm_disable_largepages(void)
917 largepages_enabled = false;
919 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
921 int is_error_page(struct page *page)
923 return page == bad_page || page == hwpoison_page || page == fault_page;
925 EXPORT_SYMBOL_GPL(is_error_page);
927 int is_error_pfn(pfn_t pfn)
929 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
931 EXPORT_SYMBOL_GPL(is_error_pfn);
933 int is_hwpoison_pfn(pfn_t pfn)
935 return pfn == hwpoison_pfn;
937 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
939 int is_fault_pfn(pfn_t pfn)
941 return pfn == fault_pfn;
943 EXPORT_SYMBOL_GPL(is_fault_pfn);
945 int is_noslot_pfn(pfn_t pfn)
947 return pfn == bad_pfn;
949 EXPORT_SYMBOL_GPL(is_noslot_pfn);
951 int is_invalid_pfn(pfn_t pfn)
953 return pfn == hwpoison_pfn || pfn == fault_pfn;
955 EXPORT_SYMBOL_GPL(is_invalid_pfn);
957 static inline unsigned long bad_hva(void)
962 int kvm_is_error_hva(unsigned long addr)
964 return addr == bad_hva();
966 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
968 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
973 for (i = 0; i < slots->nmemslots; ++i) {
974 struct kvm_memory_slot *memslot = &slots->memslots[i];
976 if (gfn >= memslot->base_gfn
977 && gfn < memslot->base_gfn + memslot->npages)
983 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
985 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
987 EXPORT_SYMBOL_GPL(gfn_to_memslot);
989 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
992 struct kvm_memslots *slots = kvm_memslots(kvm);
994 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
995 struct kvm_memory_slot *memslot = &slots->memslots[i];
997 if (memslot->flags & KVM_MEMSLOT_INVALID)
1000 if (gfn >= memslot->base_gfn
1001 && gfn < memslot->base_gfn + memslot->npages)
1006 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1008 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1010 struct vm_area_struct *vma;
1011 unsigned long addr, size;
1015 addr = gfn_to_hva(kvm, gfn);
1016 if (kvm_is_error_hva(addr))
1019 down_read(¤t->mm->mmap_sem);
1020 vma = find_vma(current->mm, addr);
1024 size = vma_kernel_pagesize(vma);
1027 up_read(¤t->mm->mmap_sem);
1032 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1035 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1039 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1041 return gfn_to_hva_memslot(slot, gfn);
1044 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1046 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1048 EXPORT_SYMBOL_GPL(gfn_to_hva);
1050 static pfn_t get_fault_pfn(void)
1052 get_page(fault_page);
1056 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1057 unsigned long start, int write, struct page **page)
1059 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1062 flags |= FOLL_WRITE;
1064 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1067 static inline int check_user_page_hwpoison(unsigned long addr)
1069 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1071 rc = __get_user_pages(current, current->mm, addr, 1,
1072 flags, NULL, NULL, NULL);
1073 return rc == -EHWPOISON;
1076 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1077 bool *async, bool write_fault, bool *writable)
1079 struct page *page[1];
1083 /* we can do it either atomically or asynchronously, not both */
1084 BUG_ON(atomic && async);
1086 BUG_ON(!write_fault && !writable);
1091 if (atomic || async)
1092 npages = __get_user_pages_fast(addr, 1, 1, page);
1094 if (unlikely(npages != 1) && !atomic) {
1098 *writable = write_fault;
1101 down_read(¤t->mm->mmap_sem);
1102 npages = get_user_page_nowait(current, current->mm,
1103 addr, write_fault, page);
1104 up_read(¤t->mm->mmap_sem);
1106 npages = get_user_pages_fast(addr, 1, write_fault,
1109 /* map read fault as writable if possible */
1110 if (unlikely(!write_fault) && npages == 1) {
1111 struct page *wpage[1];
1113 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1123 if (unlikely(npages != 1)) {
1124 struct vm_area_struct *vma;
1127 return get_fault_pfn();
1129 down_read(¤t->mm->mmap_sem);
1130 if (npages == -EHWPOISON ||
1131 (!async && check_user_page_hwpoison(addr))) {
1132 up_read(¤t->mm->mmap_sem);
1133 get_page(hwpoison_page);
1134 return page_to_pfn(hwpoison_page);
1137 vma = find_vma_intersection(current->mm, addr, addr+1);
1140 pfn = get_fault_pfn();
1141 else if ((vma->vm_flags & VM_PFNMAP)) {
1142 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1144 BUG_ON(!kvm_is_mmio_pfn(pfn));
1146 if (async && (vma->vm_flags & VM_WRITE))
1148 pfn = get_fault_pfn();
1150 up_read(¤t->mm->mmap_sem);
1152 pfn = page_to_pfn(page[0]);
1157 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1159 return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1161 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1163 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1164 bool write_fault, bool *writable)
1171 addr = gfn_to_hva(kvm, gfn);
1172 if (kvm_is_error_hva(addr)) {
1174 return page_to_pfn(bad_page);
1177 return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1180 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1182 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1184 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1186 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1187 bool write_fault, bool *writable)
1189 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1191 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1193 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1195 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1197 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1199 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1202 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1204 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1206 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1207 struct kvm_memory_slot *slot, gfn_t gfn)
1209 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1210 return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1213 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1219 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1220 if (kvm_is_error_hva(addr))
1223 if (entry < nr_pages)
1226 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1228 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1230 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1234 pfn = gfn_to_pfn(kvm, gfn);
1235 if (!kvm_is_mmio_pfn(pfn))
1236 return pfn_to_page(pfn);
1238 WARN_ON(kvm_is_mmio_pfn(pfn));
1244 EXPORT_SYMBOL_GPL(gfn_to_page);
1246 void kvm_release_page_clean(struct page *page)
1248 kvm_release_pfn_clean(page_to_pfn(page));
1250 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1252 void kvm_release_pfn_clean(pfn_t pfn)
1254 if (!kvm_is_mmio_pfn(pfn))
1255 put_page(pfn_to_page(pfn));
1257 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1259 void kvm_release_page_dirty(struct page *page)
1261 kvm_release_pfn_dirty(page_to_pfn(page));
1263 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1265 void kvm_release_pfn_dirty(pfn_t pfn)
1267 kvm_set_pfn_dirty(pfn);
1268 kvm_release_pfn_clean(pfn);
1270 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1272 void kvm_set_page_dirty(struct page *page)
1274 kvm_set_pfn_dirty(page_to_pfn(page));
1276 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1278 void kvm_set_pfn_dirty(pfn_t pfn)
1280 if (!kvm_is_mmio_pfn(pfn)) {
1281 struct page *page = pfn_to_page(pfn);
1282 if (!PageReserved(page))
1286 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1288 void kvm_set_pfn_accessed(pfn_t pfn)
1290 if (!kvm_is_mmio_pfn(pfn))
1291 mark_page_accessed(pfn_to_page(pfn));
1293 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1295 void kvm_get_pfn(pfn_t pfn)
1297 if (!kvm_is_mmio_pfn(pfn))
1298 get_page(pfn_to_page(pfn));
1300 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1302 static int next_segment(unsigned long len, int offset)
1304 if (len > PAGE_SIZE - offset)
1305 return PAGE_SIZE - offset;
1310 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1316 addr = gfn_to_hva(kvm, gfn);
1317 if (kvm_is_error_hva(addr))
1319 r = __copy_from_user(data, (void __user *)addr + offset, len);
1324 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1326 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1328 gfn_t gfn = gpa >> PAGE_SHIFT;
1330 int offset = offset_in_page(gpa);
1333 while ((seg = next_segment(len, offset)) != 0) {
1334 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1344 EXPORT_SYMBOL_GPL(kvm_read_guest);
1346 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1351 gfn_t gfn = gpa >> PAGE_SHIFT;
1352 int offset = offset_in_page(gpa);
1354 addr = gfn_to_hva(kvm, gfn);
1355 if (kvm_is_error_hva(addr))
1357 pagefault_disable();
1358 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1364 EXPORT_SYMBOL(kvm_read_guest_atomic);
1366 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1367 int offset, int len)
1372 addr = gfn_to_hva(kvm, gfn);
1373 if (kvm_is_error_hva(addr))
1375 r = __copy_to_user((void __user *)addr + offset, data, len);
1378 mark_page_dirty(kvm, gfn);
1381 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1383 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1386 gfn_t gfn = gpa >> PAGE_SHIFT;
1388 int offset = offset_in_page(gpa);
1391 while ((seg = next_segment(len, offset)) != 0) {
1392 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1403 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1404 gpa_t gpa, unsigned long len)
1406 struct kvm_memslots *slots = kvm_memslots(kvm);
1407 int offset = offset_in_page(gpa);
1408 gfn_t start_gfn = gpa >> PAGE_SHIFT;
1409 gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1410 gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1411 gfn_t nr_pages_avail;
1414 ghc->generation = slots->generation;
1416 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1417 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, &nr_pages_avail);
1418 if (!kvm_is_error_hva(ghc->hva) && nr_pages_avail >= nr_pages_needed) {
1422 * If the requested region crosses two memslots, we still
1423 * verify that the entire region is valid here.
1425 while (start_gfn <= end_gfn) {
1426 ghc->memslot = __gfn_to_memslot(slots, start_gfn);
1427 ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1429 if (kvm_is_error_hva(ghc->hva))
1431 start_gfn += nr_pages_avail;
1433 /* Use the slow path for cross page reads and writes. */
1434 ghc->memslot = NULL;
1438 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1440 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1441 void *data, unsigned long len)
1443 struct kvm_memslots *slots = kvm_memslots(kvm);
1446 BUG_ON(len > ghc->len);
1448 if (slots->generation != ghc->generation)
1449 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1451 if (unlikely(!ghc->memslot))
1452 return kvm_write_guest(kvm, ghc->gpa, data, len);
1454 if (kvm_is_error_hva(ghc->hva))
1457 r = __copy_to_user((void __user *)ghc->hva, data, len);
1460 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1464 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1466 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1467 void *data, unsigned long len)
1469 struct kvm_memslots *slots = kvm_memslots(kvm);
1472 BUG_ON(len > ghc->len);
1474 if (slots->generation != ghc->generation)
1475 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1477 if (unlikely(!ghc->memslot))
1478 return kvm_read_guest(kvm, ghc->gpa, data, len);
1480 if (kvm_is_error_hva(ghc->hva))
1483 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1489 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1491 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1493 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1496 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1498 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1500 gfn_t gfn = gpa >> PAGE_SHIFT;
1502 int offset = offset_in_page(gpa);
1505 while ((seg = next_segment(len, offset)) != 0) {
1506 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1515 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1517 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1520 if (memslot && memslot->dirty_bitmap) {
1521 unsigned long rel_gfn = gfn - memslot->base_gfn;
1523 __set_bit_le(rel_gfn, memslot->dirty_bitmap);
1527 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1529 struct kvm_memory_slot *memslot;
1531 memslot = gfn_to_memslot(kvm, gfn);
1532 mark_page_dirty_in_slot(kvm, memslot, gfn);
1536 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1538 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1543 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1545 if (kvm_arch_vcpu_runnable(vcpu)) {
1546 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1549 if (kvm_cpu_has_pending_timer(vcpu))
1551 if (signal_pending(current))
1557 finish_wait(&vcpu->wq, &wait);
1560 void kvm_resched(struct kvm_vcpu *vcpu)
1562 if (!need_resched())
1566 EXPORT_SYMBOL_GPL(kvm_resched);
1568 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1570 struct kvm *kvm = me->kvm;
1571 struct kvm_vcpu *vcpu;
1572 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1578 * We boost the priority of a VCPU that is runnable but not
1579 * currently running, because it got preempted by something
1580 * else and called schedule in __vcpu_run. Hopefully that
1581 * VCPU is holding the lock that we need and will release it.
1582 * We approximate round-robin by starting at the last boosted VCPU.
1584 for (pass = 0; pass < 2 && !yielded; pass++) {
1585 kvm_for_each_vcpu(i, vcpu, kvm) {
1586 struct task_struct *task = NULL;
1588 if (!pass && i < last_boosted_vcpu) {
1589 i = last_boosted_vcpu;
1591 } else if (pass && i > last_boosted_vcpu)
1595 if (waitqueue_active(&vcpu->wq))
1598 pid = rcu_dereference(vcpu->pid);
1600 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1604 if (task->flags & PF_VCPU) {
1605 put_task_struct(task);
1608 if (yield_to(task, 1)) {
1609 put_task_struct(task);
1610 kvm->last_boosted_vcpu = i;
1614 put_task_struct(task);
1618 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1620 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1622 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1625 if (vmf->pgoff == 0)
1626 page = virt_to_page(vcpu->run);
1628 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1629 page = virt_to_page(vcpu->arch.pio_data);
1631 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1632 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1633 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1636 return VM_FAULT_SIGBUS;
1642 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1643 .fault = kvm_vcpu_fault,
1646 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1648 vma->vm_ops = &kvm_vcpu_vm_ops;
1652 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1654 struct kvm_vcpu *vcpu = filp->private_data;
1656 kvm_put_kvm(vcpu->kvm);
1660 static struct file_operations kvm_vcpu_fops = {
1661 .release = kvm_vcpu_release,
1662 .unlocked_ioctl = kvm_vcpu_ioctl,
1663 #ifdef CONFIG_COMPAT
1664 .compat_ioctl = kvm_vcpu_compat_ioctl,
1666 .mmap = kvm_vcpu_mmap,
1667 .llseek = noop_llseek,
1671 * Allocates an inode for the vcpu.
1673 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1675 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1679 * Creates some virtual cpus. Good luck creating more than one.
1681 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1684 struct kvm_vcpu *vcpu, *v;
1686 if (id >= KVM_MAX_VCPUS)
1689 vcpu = kvm_arch_vcpu_create(kvm, id);
1691 return PTR_ERR(vcpu);
1693 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1695 r = kvm_arch_vcpu_setup(vcpu);
1699 mutex_lock(&kvm->lock);
1700 if (!kvm_vcpu_compatible(vcpu)) {
1702 goto unlock_vcpu_destroy;
1704 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1706 goto unlock_vcpu_destroy;
1709 kvm_for_each_vcpu(r, v, kvm)
1710 if (v->vcpu_id == id) {
1712 goto unlock_vcpu_destroy;
1715 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1717 /* Now it's all set up, let userspace reach it */
1719 r = create_vcpu_fd(vcpu);
1722 goto unlock_vcpu_destroy;
1725 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1727 atomic_inc(&kvm->online_vcpus);
1729 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1730 if (kvm->bsp_vcpu_id == id)
1731 kvm->bsp_vcpu = vcpu;
1733 mutex_unlock(&kvm->lock);
1736 unlock_vcpu_destroy:
1737 mutex_unlock(&kvm->lock);
1739 kvm_arch_vcpu_destroy(vcpu);
1743 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1746 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1747 vcpu->sigset_active = 1;
1748 vcpu->sigset = *sigset;
1750 vcpu->sigset_active = 0;
1754 static long kvm_vcpu_ioctl(struct file *filp,
1755 unsigned int ioctl, unsigned long arg)
1757 struct kvm_vcpu *vcpu = filp->private_data;
1758 void __user *argp = (void __user *)arg;
1760 struct kvm_fpu *fpu = NULL;
1761 struct kvm_sregs *kvm_sregs = NULL;
1763 if (vcpu->kvm->mm != current->mm)
1766 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1768 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1769 * so vcpu_load() would break it.
1771 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1772 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1782 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1783 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1785 case KVM_GET_REGS: {
1786 struct kvm_regs *kvm_regs;
1789 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1792 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1796 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1803 case KVM_SET_REGS: {
1804 struct kvm_regs *kvm_regs;
1807 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1811 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1813 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1821 case KVM_GET_SREGS: {
1822 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1826 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1830 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1835 case KVM_SET_SREGS: {
1836 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1841 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1843 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1849 case KVM_GET_MP_STATE: {
1850 struct kvm_mp_state mp_state;
1852 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1856 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1861 case KVM_SET_MP_STATE: {
1862 struct kvm_mp_state mp_state;
1865 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1867 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1873 case KVM_TRANSLATE: {
1874 struct kvm_translation tr;
1877 if (copy_from_user(&tr, argp, sizeof tr))
1879 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1883 if (copy_to_user(argp, &tr, sizeof tr))
1888 case KVM_SET_GUEST_DEBUG: {
1889 struct kvm_guest_debug dbg;
1892 if (copy_from_user(&dbg, argp, sizeof dbg))
1894 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1900 case KVM_SET_SIGNAL_MASK: {
1901 struct kvm_signal_mask __user *sigmask_arg = argp;
1902 struct kvm_signal_mask kvm_sigmask;
1903 sigset_t sigset, *p;
1908 if (copy_from_user(&kvm_sigmask, argp,
1909 sizeof kvm_sigmask))
1912 if (kvm_sigmask.len != sizeof sigset)
1915 if (copy_from_user(&sigset, sigmask_arg->sigset,
1920 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1924 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1928 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1932 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1938 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1943 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1945 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1952 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1961 #ifdef CONFIG_COMPAT
1962 static long kvm_vcpu_compat_ioctl(struct file *filp,
1963 unsigned int ioctl, unsigned long arg)
1965 struct kvm_vcpu *vcpu = filp->private_data;
1966 void __user *argp = compat_ptr(arg);
1969 if (vcpu->kvm->mm != current->mm)
1973 case KVM_SET_SIGNAL_MASK: {
1974 struct kvm_signal_mask __user *sigmask_arg = argp;
1975 struct kvm_signal_mask kvm_sigmask;
1976 compat_sigset_t csigset;
1981 if (copy_from_user(&kvm_sigmask, argp,
1982 sizeof kvm_sigmask))
1985 if (kvm_sigmask.len != sizeof csigset)
1988 if (copy_from_user(&csigset, sigmask_arg->sigset,
1992 sigset_from_compat(&sigset, &csigset);
1993 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1997 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2005 static long kvm_vm_ioctl(struct file *filp,
2006 unsigned int ioctl, unsigned long arg)
2008 struct kvm *kvm = filp->private_data;
2009 void __user *argp = (void __user *)arg;
2012 if (kvm->mm != current->mm)
2015 case KVM_CREATE_VCPU:
2016 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2020 case KVM_SET_USER_MEMORY_REGION: {
2021 struct kvm_userspace_memory_region kvm_userspace_mem;
2024 if (copy_from_user(&kvm_userspace_mem, argp,
2025 sizeof kvm_userspace_mem))
2028 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
2033 case KVM_GET_DIRTY_LOG: {
2034 struct kvm_dirty_log log;
2037 if (copy_from_user(&log, argp, sizeof log))
2039 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2044 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2045 case KVM_REGISTER_COALESCED_MMIO: {
2046 struct kvm_coalesced_mmio_zone zone;
2048 if (copy_from_user(&zone, argp, sizeof zone))
2050 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2056 case KVM_UNREGISTER_COALESCED_MMIO: {
2057 struct kvm_coalesced_mmio_zone zone;
2059 if (copy_from_user(&zone, argp, sizeof zone))
2061 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2069 struct kvm_irqfd data;
2072 if (copy_from_user(&data, argp, sizeof data))
2074 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2077 case KVM_IOEVENTFD: {
2078 struct kvm_ioeventfd data;
2081 if (copy_from_user(&data, argp, sizeof data))
2083 r = kvm_ioeventfd(kvm, &data);
2086 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2087 case KVM_SET_BOOT_CPU_ID:
2089 mutex_lock(&kvm->lock);
2090 if (atomic_read(&kvm->online_vcpus) != 0)
2093 kvm->bsp_vcpu_id = arg;
2094 mutex_unlock(&kvm->lock);
2098 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2100 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2106 #ifdef CONFIG_COMPAT
2107 struct compat_kvm_dirty_log {
2111 compat_uptr_t dirty_bitmap; /* one bit per page */
2116 static long kvm_vm_compat_ioctl(struct file *filp,
2117 unsigned int ioctl, unsigned long arg)
2119 struct kvm *kvm = filp->private_data;
2122 if (kvm->mm != current->mm)
2125 case KVM_GET_DIRTY_LOG: {
2126 struct compat_kvm_dirty_log compat_log;
2127 struct kvm_dirty_log log;
2130 if (copy_from_user(&compat_log, (void __user *)arg,
2131 sizeof(compat_log)))
2133 log.slot = compat_log.slot;
2134 log.padding1 = compat_log.padding1;
2135 log.padding2 = compat_log.padding2;
2136 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2138 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2144 r = kvm_vm_ioctl(filp, ioctl, arg);
2152 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2154 struct page *page[1];
2157 gfn_t gfn = vmf->pgoff;
2158 struct kvm *kvm = vma->vm_file->private_data;
2160 addr = gfn_to_hva(kvm, gfn);
2161 if (kvm_is_error_hva(addr))
2162 return VM_FAULT_SIGBUS;
2164 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2166 if (unlikely(npages != 1))
2167 return VM_FAULT_SIGBUS;
2169 vmf->page = page[0];
2173 static const struct vm_operations_struct kvm_vm_vm_ops = {
2174 .fault = kvm_vm_fault,
2177 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2179 vma->vm_ops = &kvm_vm_vm_ops;
2183 static struct file_operations kvm_vm_fops = {
2184 .release = kvm_vm_release,
2185 .unlocked_ioctl = kvm_vm_ioctl,
2186 #ifdef CONFIG_COMPAT
2187 .compat_ioctl = kvm_vm_compat_ioctl,
2189 .mmap = kvm_vm_mmap,
2190 .llseek = noop_llseek,
2193 static int kvm_dev_ioctl_create_vm(void)
2198 kvm = kvm_create_vm();
2200 return PTR_ERR(kvm);
2201 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2202 r = kvm_coalesced_mmio_init(kvm);
2208 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2215 static long kvm_dev_ioctl_check_extension_generic(long arg)
2218 case KVM_CAP_USER_MEMORY:
2219 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2220 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2221 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2222 case KVM_CAP_SET_BOOT_CPU_ID:
2224 case KVM_CAP_INTERNAL_ERROR_DATA:
2226 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2227 case KVM_CAP_IRQ_ROUTING:
2228 return KVM_MAX_IRQ_ROUTES;
2233 return kvm_dev_ioctl_check_extension(arg);
2236 static long kvm_dev_ioctl(struct file *filp,
2237 unsigned int ioctl, unsigned long arg)
2242 case KVM_GET_API_VERSION:
2246 r = KVM_API_VERSION;
2252 r = kvm_dev_ioctl_create_vm();
2254 case KVM_CHECK_EXTENSION:
2255 r = kvm_dev_ioctl_check_extension_generic(arg);
2257 case KVM_GET_VCPU_MMAP_SIZE:
2261 r = PAGE_SIZE; /* struct kvm_run */
2263 r += PAGE_SIZE; /* pio data page */
2265 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2266 r += PAGE_SIZE; /* coalesced mmio ring page */
2269 case KVM_TRACE_ENABLE:
2270 case KVM_TRACE_PAUSE:
2271 case KVM_TRACE_DISABLE:
2275 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2281 static struct file_operations kvm_chardev_ops = {
2282 .unlocked_ioctl = kvm_dev_ioctl,
2283 .compat_ioctl = kvm_dev_ioctl,
2284 .llseek = noop_llseek,
2287 static struct miscdevice kvm_dev = {
2293 static void hardware_enable_nolock(void *junk)
2295 int cpu = raw_smp_processor_id();
2298 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2301 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2303 r = kvm_arch_hardware_enable(NULL);
2306 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2307 atomic_inc(&hardware_enable_failed);
2308 printk(KERN_INFO "kvm: enabling virtualization on "
2309 "CPU%d failed\n", cpu);
2313 static void hardware_enable(void *junk)
2315 raw_spin_lock(&kvm_lock);
2316 hardware_enable_nolock(junk);
2317 raw_spin_unlock(&kvm_lock);
2320 static void hardware_disable_nolock(void *junk)
2322 int cpu = raw_smp_processor_id();
2324 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2326 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2327 kvm_arch_hardware_disable(NULL);
2330 static void hardware_disable(void *junk)
2332 raw_spin_lock(&kvm_lock);
2333 hardware_disable_nolock(junk);
2334 raw_spin_unlock(&kvm_lock);
2337 static void hardware_disable_all_nolock(void)
2339 BUG_ON(!kvm_usage_count);
2342 if (!kvm_usage_count)
2343 on_each_cpu(hardware_disable_nolock, NULL, 1);
2346 static void hardware_disable_all(void)
2348 raw_spin_lock(&kvm_lock);
2349 hardware_disable_all_nolock();
2350 raw_spin_unlock(&kvm_lock);
2353 static int hardware_enable_all(void)
2357 raw_spin_lock(&kvm_lock);
2360 if (kvm_usage_count == 1) {
2361 atomic_set(&hardware_enable_failed, 0);
2362 on_each_cpu(hardware_enable_nolock, NULL, 1);
2364 if (atomic_read(&hardware_enable_failed)) {
2365 hardware_disable_all_nolock();
2370 raw_spin_unlock(&kvm_lock);
2375 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2380 if (!kvm_usage_count)
2383 val &= ~CPU_TASKS_FROZEN;
2386 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2388 hardware_disable(NULL);
2391 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2393 hardware_enable(NULL);
2400 asmlinkage void kvm_spurious_fault(void)
2402 /* Fault while not rebooting. We want the trace. */
2405 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2407 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2411 * Some (well, at least mine) BIOSes hang on reboot if
2414 * And Intel TXT required VMX off for all cpu when system shutdown.
2416 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2417 kvm_rebooting = true;
2418 on_each_cpu(hardware_disable_nolock, NULL, 1);
2422 static struct notifier_block kvm_reboot_notifier = {
2423 .notifier_call = kvm_reboot,
2427 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2431 for (i = 0; i < bus->dev_count; i++) {
2432 struct kvm_io_device *pos = bus->range[i].dev;
2434 kvm_iodevice_destructor(pos);
2439 int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
2441 const struct kvm_io_range *r1 = p1;
2442 const struct kvm_io_range *r2 = p2;
2444 if (r1->addr < r2->addr)
2446 if (r1->addr + r1->len > r2->addr + r2->len)
2451 int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
2452 gpa_t addr, int len)
2454 if (bus->dev_count == NR_IOBUS_DEVS)
2457 bus->range[bus->dev_count++] = (struct kvm_io_range) {
2463 sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
2464 kvm_io_bus_sort_cmp, NULL);
2469 int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
2470 gpa_t addr, int len)
2472 struct kvm_io_range *range, key;
2475 key = (struct kvm_io_range) {
2480 range = bsearch(&key, bus->range, bus->dev_count,
2481 sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
2485 off = range - bus->range;
2487 while (off > 0 && kvm_io_bus_sort_cmp(&key, &bus->range[off-1]) == 0)
2493 /* kvm_io_bus_write - called under kvm->slots_lock */
2494 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2495 int len, const void *val)
2498 struct kvm_io_bus *bus;
2499 struct kvm_io_range range;
2501 range = (struct kvm_io_range) {
2506 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2507 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2511 while (idx < bus->dev_count &&
2512 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2513 if (!kvm_iodevice_write(bus->range[idx].dev, addr, len, val))
2521 /* kvm_io_bus_read - called under kvm->slots_lock */
2522 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2526 struct kvm_io_bus *bus;
2527 struct kvm_io_range range;
2529 range = (struct kvm_io_range) {
2534 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2535 idx = kvm_io_bus_get_first_dev(bus, addr, len);
2539 while (idx < bus->dev_count &&
2540 kvm_io_bus_sort_cmp(&range, &bus->range[idx]) == 0) {
2541 if (!kvm_iodevice_read(bus->range[idx].dev, addr, len, val))
2549 /* Caller must hold slots_lock. */
2550 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2551 int len, struct kvm_io_device *dev)
2553 struct kvm_io_bus *new_bus, *bus;
2555 bus = kvm->buses[bus_idx];
2556 if (bus->dev_count > NR_IOBUS_DEVS-1)
2559 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2562 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2563 kvm_io_bus_insert_dev(new_bus, dev, addr, len);
2564 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2565 synchronize_srcu_expedited(&kvm->srcu);
2571 /* Caller must hold slots_lock. */
2572 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2573 struct kvm_io_device *dev)
2576 struct kvm_io_bus *new_bus, *bus;
2578 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2582 bus = kvm->buses[bus_idx];
2583 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2586 for (i = 0; i < new_bus->dev_count; i++)
2587 if (new_bus->range[i].dev == dev) {
2589 new_bus->dev_count--;
2590 new_bus->range[i] = new_bus->range[new_bus->dev_count];
2591 sort(new_bus->range, new_bus->dev_count,
2592 sizeof(struct kvm_io_range),
2593 kvm_io_bus_sort_cmp, NULL);
2602 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2603 synchronize_srcu_expedited(&kvm->srcu);
2608 static struct notifier_block kvm_cpu_notifier = {
2609 .notifier_call = kvm_cpu_hotplug,
2612 static int vm_stat_get(void *_offset, u64 *val)
2614 unsigned offset = (long)_offset;
2618 raw_spin_lock(&kvm_lock);
2619 list_for_each_entry(kvm, &vm_list, vm_list)
2620 *val += *(u32 *)((void *)kvm + offset);
2621 raw_spin_unlock(&kvm_lock);
2625 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2627 static int vcpu_stat_get(void *_offset, u64 *val)
2629 unsigned offset = (long)_offset;
2631 struct kvm_vcpu *vcpu;
2635 raw_spin_lock(&kvm_lock);
2636 list_for_each_entry(kvm, &vm_list, vm_list)
2637 kvm_for_each_vcpu(i, vcpu, kvm)
2638 *val += *(u32 *)((void *)vcpu + offset);
2640 raw_spin_unlock(&kvm_lock);
2644 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2646 static const struct file_operations *stat_fops[] = {
2647 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2648 [KVM_STAT_VM] = &vm_stat_fops,
2651 static void kvm_init_debug(void)
2653 struct kvm_stats_debugfs_item *p;
2655 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2656 for (p = debugfs_entries; p->name; ++p)
2657 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2658 (void *)(long)p->offset,
2659 stat_fops[p->kind]);
2662 static void kvm_exit_debug(void)
2664 struct kvm_stats_debugfs_item *p;
2666 for (p = debugfs_entries; p->name; ++p)
2667 debugfs_remove(p->dentry);
2668 debugfs_remove(kvm_debugfs_dir);
2671 static int kvm_suspend(void)
2673 if (kvm_usage_count)
2674 hardware_disable_nolock(NULL);
2678 static void kvm_resume(void)
2680 if (kvm_usage_count) {
2681 WARN_ON(raw_spin_is_locked(&kvm_lock));
2682 hardware_enable_nolock(NULL);
2686 static struct syscore_ops kvm_syscore_ops = {
2687 .suspend = kvm_suspend,
2688 .resume = kvm_resume,
2691 struct page *bad_page;
2695 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2697 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2700 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2702 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2704 kvm_arch_vcpu_load(vcpu, cpu);
2707 static void kvm_sched_out(struct preempt_notifier *pn,
2708 struct task_struct *next)
2710 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2712 kvm_arch_vcpu_put(vcpu);
2715 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2716 struct module *module)
2721 r = kvm_arch_init(opaque);
2725 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2727 if (bad_page == NULL) {
2732 bad_pfn = page_to_pfn(bad_page);
2734 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2736 if (hwpoison_page == NULL) {
2741 hwpoison_pfn = page_to_pfn(hwpoison_page);
2743 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2745 if (fault_page == NULL) {
2750 fault_pfn = page_to_pfn(fault_page);
2752 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2757 r = kvm_arch_hardware_setup();
2761 for_each_online_cpu(cpu) {
2762 smp_call_function_single(cpu,
2763 kvm_arch_check_processor_compat,
2769 r = register_cpu_notifier(&kvm_cpu_notifier);
2772 register_reboot_notifier(&kvm_reboot_notifier);
2774 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2776 vcpu_align = __alignof__(struct kvm_vcpu);
2777 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2779 if (!kvm_vcpu_cache) {
2784 r = kvm_async_pf_init();
2788 kvm_chardev_ops.owner = module;
2789 kvm_vm_fops.owner = module;
2790 kvm_vcpu_fops.owner = module;
2792 r = misc_register(&kvm_dev);
2794 printk(KERN_ERR "kvm: misc device register failed\n");
2798 register_syscore_ops(&kvm_syscore_ops);
2800 kvm_preempt_ops.sched_in = kvm_sched_in;
2801 kvm_preempt_ops.sched_out = kvm_sched_out;
2808 kvm_async_pf_deinit();
2810 kmem_cache_destroy(kvm_vcpu_cache);
2812 unregister_reboot_notifier(&kvm_reboot_notifier);
2813 unregister_cpu_notifier(&kvm_cpu_notifier);
2816 kvm_arch_hardware_unsetup();
2818 free_cpumask_var(cpus_hardware_enabled);
2821 __free_page(fault_page);
2823 __free_page(hwpoison_page);
2824 __free_page(bad_page);
2830 EXPORT_SYMBOL_GPL(kvm_init);
2835 misc_deregister(&kvm_dev);
2836 kmem_cache_destroy(kvm_vcpu_cache);
2837 kvm_async_pf_deinit();
2838 unregister_syscore_ops(&kvm_syscore_ops);
2839 unregister_reboot_notifier(&kvm_reboot_notifier);
2840 unregister_cpu_notifier(&kvm_cpu_notifier);
2841 on_each_cpu(hardware_disable_nolock, NULL, 1);
2842 kvm_arch_hardware_unsetup();
2844 free_cpumask_var(cpus_hardware_enabled);
2845 __free_page(hwpoison_page);
2846 __free_page(bad_page);
2848 EXPORT_SYMBOL_GPL(kvm_exit);