2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
47 #include <asm/processor.h>
49 #include <asm/uaccess.h>
50 #include <asm/pgtable.h>
52 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
53 #include "coalesced_mmio.h"
56 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
57 #include <linux/pci.h>
58 #include <linux/interrupt.h>
62 MODULE_AUTHOR("Qumranet");
63 MODULE_LICENSE("GPL");
68 * kvm->lock --> kvm->irq_lock
71 DEFINE_SPINLOCK(kvm_lock);
74 static cpumask_var_t cpus_hardware_enabled;
76 struct kmem_cache *kvm_vcpu_cache;
77 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
79 static __read_mostly struct preempt_ops kvm_preempt_ops;
81 struct dentry *kvm_debugfs_dir;
83 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
86 static bool kvm_rebooting;
88 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
89 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
92 struct list_head *ptr;
93 struct kvm_assigned_dev_kernel *match;
95 list_for_each(ptr, head) {
96 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
97 if (match->assigned_dev_id == assigned_dev_id)
103 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
104 *assigned_dev, int irq)
107 struct msix_entry *host_msix_entries;
109 host_msix_entries = assigned_dev->host_msix_entries;
112 for (i = 0; i < assigned_dev->entries_nr; i++)
113 if (irq == host_msix_entries[i].vector) {
118 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
125 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
127 struct kvm_assigned_dev_kernel *assigned_dev;
131 assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
133 kvm = assigned_dev->kvm;
135 mutex_lock(&kvm->irq_lock);
136 spin_lock_irq(&assigned_dev->assigned_dev_lock);
137 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
138 struct kvm_guest_msix_entry *guest_entries =
139 assigned_dev->guest_msix_entries;
140 for (i = 0; i < assigned_dev->entries_nr; i++) {
141 if (!(guest_entries[i].flags &
142 KVM_ASSIGNED_MSIX_PENDING))
144 guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
145 kvm_set_irq(assigned_dev->kvm,
146 assigned_dev->irq_source_id,
147 guest_entries[i].vector, 1);
150 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
151 assigned_dev->guest_irq, 1);
153 spin_unlock_irq(&assigned_dev->assigned_dev_lock);
154 mutex_unlock(&assigned_dev->kvm->irq_lock);
157 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
160 struct kvm_assigned_dev_kernel *assigned_dev =
161 (struct kvm_assigned_dev_kernel *) dev_id;
163 spin_lock_irqsave(&assigned_dev->assigned_dev_lock, flags);
164 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
165 int index = find_index_from_host_irq(assigned_dev, irq);
168 assigned_dev->guest_msix_entries[index].flags |=
169 KVM_ASSIGNED_MSIX_PENDING;
172 schedule_work(&assigned_dev->interrupt_work);
174 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
175 disable_irq_nosync(irq);
176 assigned_dev->host_irq_disabled = true;
180 spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags);
184 /* Ack the irq line for an assigned device */
185 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
187 struct kvm_assigned_dev_kernel *dev;
193 dev = container_of(kian, struct kvm_assigned_dev_kernel,
196 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
198 /* The guest irq may be shared so this ack may be
199 * from another device.
201 spin_lock_irqsave(&dev->assigned_dev_lock, flags);
202 if (dev->host_irq_disabled) {
203 enable_irq(dev->host_irq);
204 dev->host_irq_disabled = false;
206 spin_unlock_irqrestore(&dev->assigned_dev_lock, flags);
209 static void deassign_guest_irq(struct kvm *kvm,
210 struct kvm_assigned_dev_kernel *assigned_dev)
212 kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
213 assigned_dev->ack_notifier.gsi = -1;
215 if (assigned_dev->irq_source_id != -1)
216 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
217 assigned_dev->irq_source_id = -1;
218 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
221 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
222 static void deassign_host_irq(struct kvm *kvm,
223 struct kvm_assigned_dev_kernel *assigned_dev)
226 * In kvm_free_device_irq, cancel_work_sync return true if:
227 * 1. work is scheduled, and then cancelled.
228 * 2. work callback is executed.
230 * The first one ensured that the irq is disabled and no more events
231 * would happen. But for the second one, the irq may be enabled (e.g.
232 * for MSI). So we disable irq here to prevent further events.
234 * Notice this maybe result in nested disable if the interrupt type is
235 * INTx, but it's OK for we are going to free it.
237 * If this function is a part of VM destroy, please ensure that till
238 * now, the kvm state is still legal for probably we also have to wait
239 * interrupt_work done.
241 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
243 for (i = 0; i < assigned_dev->entries_nr; i++)
244 disable_irq_nosync(assigned_dev->
245 host_msix_entries[i].vector);
247 cancel_work_sync(&assigned_dev->interrupt_work);
249 for (i = 0; i < assigned_dev->entries_nr; i++)
250 free_irq(assigned_dev->host_msix_entries[i].vector,
251 (void *)assigned_dev);
253 assigned_dev->entries_nr = 0;
254 kfree(assigned_dev->host_msix_entries);
255 kfree(assigned_dev->guest_msix_entries);
256 pci_disable_msix(assigned_dev->dev);
258 /* Deal with MSI and INTx */
259 disable_irq_nosync(assigned_dev->host_irq);
260 cancel_work_sync(&assigned_dev->interrupt_work);
262 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
264 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
265 pci_disable_msi(assigned_dev->dev);
268 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
271 static int kvm_deassign_irq(struct kvm *kvm,
272 struct kvm_assigned_dev_kernel *assigned_dev,
273 unsigned long irq_requested_type)
275 unsigned long guest_irq_type, host_irq_type;
277 if (!irqchip_in_kernel(kvm))
279 /* no irq assignment to deassign */
280 if (!assigned_dev->irq_requested_type)
283 host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
284 guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
287 deassign_host_irq(kvm, assigned_dev);
289 deassign_guest_irq(kvm, assigned_dev);
294 static void kvm_free_assigned_irq(struct kvm *kvm,
295 struct kvm_assigned_dev_kernel *assigned_dev)
297 kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
300 static void kvm_free_assigned_device(struct kvm *kvm,
301 struct kvm_assigned_dev_kernel
304 kvm_free_assigned_irq(kvm, assigned_dev);
306 pci_reset_function(assigned_dev->dev);
308 pci_release_regions(assigned_dev->dev);
309 pci_disable_device(assigned_dev->dev);
310 pci_dev_put(assigned_dev->dev);
312 list_del(&assigned_dev->list);
316 void kvm_free_all_assigned_devices(struct kvm *kvm)
318 struct list_head *ptr, *ptr2;
319 struct kvm_assigned_dev_kernel *assigned_dev;
321 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
322 assigned_dev = list_entry(ptr,
323 struct kvm_assigned_dev_kernel,
326 kvm_free_assigned_device(kvm, assigned_dev);
330 static int assigned_device_enable_host_intx(struct kvm *kvm,
331 struct kvm_assigned_dev_kernel *dev)
333 dev->host_irq = dev->dev->irq;
334 /* Even though this is PCI, we don't want to use shared
335 * interrupts. Sharing host devices with guest-assigned devices
336 * on the same interrupt line is not a happy situation: there
337 * are going to be long delays in accepting, acking, etc.
339 if (request_irq(dev->host_irq, kvm_assigned_dev_intr,
340 0, "kvm_assigned_intx_device", (void *)dev))
345 #ifdef __KVM_HAVE_MSI
346 static int assigned_device_enable_host_msi(struct kvm *kvm,
347 struct kvm_assigned_dev_kernel *dev)
351 if (!dev->dev->msi_enabled) {
352 r = pci_enable_msi(dev->dev);
357 dev->host_irq = dev->dev->irq;
358 if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0,
359 "kvm_assigned_msi_device", (void *)dev)) {
360 pci_disable_msi(dev->dev);
368 #ifdef __KVM_HAVE_MSIX
369 static int assigned_device_enable_host_msix(struct kvm *kvm,
370 struct kvm_assigned_dev_kernel *dev)
374 /* host_msix_entries and guest_msix_entries should have been
376 if (dev->entries_nr == 0)
379 r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
383 for (i = 0; i < dev->entries_nr; i++) {
384 r = request_irq(dev->host_msix_entries[i].vector,
385 kvm_assigned_dev_intr, 0,
386 "kvm_assigned_msix_device",
388 /* FIXME: free requested_irq's on failure */
398 static int assigned_device_enable_guest_intx(struct kvm *kvm,
399 struct kvm_assigned_dev_kernel *dev,
400 struct kvm_assigned_irq *irq)
402 dev->guest_irq = irq->guest_irq;
403 dev->ack_notifier.gsi = irq->guest_irq;
407 #ifdef __KVM_HAVE_MSI
408 static int assigned_device_enable_guest_msi(struct kvm *kvm,
409 struct kvm_assigned_dev_kernel *dev,
410 struct kvm_assigned_irq *irq)
412 dev->guest_irq = irq->guest_irq;
413 dev->ack_notifier.gsi = -1;
414 dev->host_irq_disabled = false;
418 #ifdef __KVM_HAVE_MSIX
419 static int assigned_device_enable_guest_msix(struct kvm *kvm,
420 struct kvm_assigned_dev_kernel *dev,
421 struct kvm_assigned_irq *irq)
423 dev->guest_irq = irq->guest_irq;
424 dev->ack_notifier.gsi = -1;
425 dev->host_irq_disabled = false;
430 static int assign_host_irq(struct kvm *kvm,
431 struct kvm_assigned_dev_kernel *dev,
436 if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
439 switch (host_irq_type) {
440 case KVM_DEV_IRQ_HOST_INTX:
441 r = assigned_device_enable_host_intx(kvm, dev);
443 #ifdef __KVM_HAVE_MSI
444 case KVM_DEV_IRQ_HOST_MSI:
445 r = assigned_device_enable_host_msi(kvm, dev);
448 #ifdef __KVM_HAVE_MSIX
449 case KVM_DEV_IRQ_HOST_MSIX:
450 r = assigned_device_enable_host_msix(kvm, dev);
458 dev->irq_requested_type |= host_irq_type;
463 static int assign_guest_irq(struct kvm *kvm,
464 struct kvm_assigned_dev_kernel *dev,
465 struct kvm_assigned_irq *irq,
466 unsigned long guest_irq_type)
471 if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
474 id = kvm_request_irq_source_id(kvm);
478 dev->irq_source_id = id;
480 switch (guest_irq_type) {
481 case KVM_DEV_IRQ_GUEST_INTX:
482 r = assigned_device_enable_guest_intx(kvm, dev, irq);
484 #ifdef __KVM_HAVE_MSI
485 case KVM_DEV_IRQ_GUEST_MSI:
486 r = assigned_device_enable_guest_msi(kvm, dev, irq);
489 #ifdef __KVM_HAVE_MSIX
490 case KVM_DEV_IRQ_GUEST_MSIX:
491 r = assigned_device_enable_guest_msix(kvm, dev, irq);
499 dev->irq_requested_type |= guest_irq_type;
500 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
502 kvm_free_irq_source_id(kvm, dev->irq_source_id);
507 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
508 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
509 struct kvm_assigned_irq *assigned_irq)
512 struct kvm_assigned_dev_kernel *match;
513 unsigned long host_irq_type, guest_irq_type;
515 if (!capable(CAP_SYS_RAWIO))
518 if (!irqchip_in_kernel(kvm))
521 mutex_lock(&kvm->lock);
523 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
524 assigned_irq->assigned_dev_id);
528 host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
529 guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
532 /* can only assign one type at a time */
533 if (hweight_long(host_irq_type) > 1)
535 if (hweight_long(guest_irq_type) > 1)
537 if (host_irq_type == 0 && guest_irq_type == 0)
542 r = assign_host_irq(kvm, match, host_irq_type);
547 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
549 mutex_unlock(&kvm->lock);
553 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
554 struct kvm_assigned_irq
558 struct kvm_assigned_dev_kernel *match;
560 mutex_lock(&kvm->lock);
562 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
563 assigned_irq->assigned_dev_id);
567 r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
569 mutex_unlock(&kvm->lock);
573 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
574 struct kvm_assigned_pci_dev *assigned_dev)
577 struct kvm_assigned_dev_kernel *match;
580 down_read(&kvm->slots_lock);
581 mutex_lock(&kvm->lock);
583 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
584 assigned_dev->assigned_dev_id);
586 /* device already assigned */
591 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
593 printk(KERN_INFO "%s: Couldn't allocate memory\n",
598 dev = pci_get_bus_and_slot(assigned_dev->busnr,
599 assigned_dev->devfn);
601 printk(KERN_INFO "%s: host device not found\n", __func__);
605 if (pci_enable_device(dev)) {
606 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
610 r = pci_request_regions(dev, "kvm_assigned_device");
612 printk(KERN_INFO "%s: Could not get access to device regions\n",
617 pci_reset_function(dev);
619 match->assigned_dev_id = assigned_dev->assigned_dev_id;
620 match->host_busnr = assigned_dev->busnr;
621 match->host_devfn = assigned_dev->devfn;
622 match->flags = assigned_dev->flags;
624 spin_lock_init(&match->assigned_dev_lock);
625 match->irq_source_id = -1;
627 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
628 INIT_WORK(&match->interrupt_work,
629 kvm_assigned_dev_interrupt_work_handler);
631 list_add(&match->list, &kvm->arch.assigned_dev_head);
633 if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
634 if (!kvm->arch.iommu_domain) {
635 r = kvm_iommu_map_guest(kvm);
639 r = kvm_assign_device(kvm, match);
645 mutex_unlock(&kvm->lock);
646 up_read(&kvm->slots_lock);
649 list_del(&match->list);
650 pci_release_regions(dev);
652 pci_disable_device(dev);
657 mutex_unlock(&kvm->lock);
658 up_read(&kvm->slots_lock);
663 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
664 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
665 struct kvm_assigned_pci_dev *assigned_dev)
668 struct kvm_assigned_dev_kernel *match;
670 mutex_lock(&kvm->lock);
672 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
673 assigned_dev->assigned_dev_id);
675 printk(KERN_INFO "%s: device hasn't been assigned before, "
676 "so cannot be deassigned\n", __func__);
681 if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
682 kvm_deassign_device(kvm, match);
684 kvm_free_assigned_device(kvm, match);
687 mutex_unlock(&kvm->lock);
692 inline int kvm_is_mmio_pfn(pfn_t pfn)
694 if (pfn_valid(pfn)) {
695 struct page *page = compound_head(pfn_to_page(pfn));
696 return PageReserved(page);
703 * Switches to specified vcpu, until a matching vcpu_put()
705 void vcpu_load(struct kvm_vcpu *vcpu)
709 mutex_lock(&vcpu->mutex);
711 preempt_notifier_register(&vcpu->preempt_notifier);
712 kvm_arch_vcpu_load(vcpu, cpu);
716 void vcpu_put(struct kvm_vcpu *vcpu)
719 kvm_arch_vcpu_put(vcpu);
720 preempt_notifier_unregister(&vcpu->preempt_notifier);
722 mutex_unlock(&vcpu->mutex);
725 static void ack_flush(void *_completed)
729 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
734 struct kvm_vcpu *vcpu;
736 if (alloc_cpumask_var(&cpus, GFP_ATOMIC))
740 spin_lock(&kvm->requests_lock);
741 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
742 vcpu = kvm->vcpus[i];
745 if (test_and_set_bit(req, &vcpu->requests))
748 if (cpus != NULL && cpu != -1 && cpu != me)
749 cpumask_set_cpu(cpu, cpus);
751 if (unlikely(cpus == NULL))
752 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
753 else if (!cpumask_empty(cpus))
754 smp_call_function_many(cpus, ack_flush, NULL, 1);
757 spin_unlock(&kvm->requests_lock);
759 free_cpumask_var(cpus);
763 void kvm_flush_remote_tlbs(struct kvm *kvm)
765 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
766 ++kvm->stat.remote_tlb_flush;
769 void kvm_reload_remote_mmus(struct kvm *kvm)
771 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
774 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
779 mutex_init(&vcpu->mutex);
783 init_waitqueue_head(&vcpu->wq);
785 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
790 vcpu->run = page_address(page);
792 r = kvm_arch_vcpu_init(vcpu);
798 free_page((unsigned long)vcpu->run);
802 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
804 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
806 kvm_arch_vcpu_uninit(vcpu);
807 free_page((unsigned long)vcpu->run);
809 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
811 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
812 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
814 return container_of(mn, struct kvm, mmu_notifier);
817 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
818 struct mm_struct *mm,
819 unsigned long address)
821 struct kvm *kvm = mmu_notifier_to_kvm(mn);
825 * When ->invalidate_page runs, the linux pte has been zapped
826 * already but the page is still allocated until
827 * ->invalidate_page returns. So if we increase the sequence
828 * here the kvm page fault will notice if the spte can't be
829 * established because the page is going to be freed. If
830 * instead the kvm page fault establishes the spte before
831 * ->invalidate_page runs, kvm_unmap_hva will release it
834 * The sequence increase only need to be seen at spin_unlock
835 * time, and not at spin_lock time.
837 * Increasing the sequence after the spin_unlock would be
838 * unsafe because the kvm page fault could then establish the
839 * pte after kvm_unmap_hva returned, without noticing the page
840 * is going to be freed.
842 spin_lock(&kvm->mmu_lock);
843 kvm->mmu_notifier_seq++;
844 need_tlb_flush = kvm_unmap_hva(kvm, address);
845 spin_unlock(&kvm->mmu_lock);
847 /* we've to flush the tlb before the pages can be freed */
849 kvm_flush_remote_tlbs(kvm);
853 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
854 struct mm_struct *mm,
858 struct kvm *kvm = mmu_notifier_to_kvm(mn);
859 int need_tlb_flush = 0;
861 spin_lock(&kvm->mmu_lock);
863 * The count increase must become visible at unlock time as no
864 * spte can be established without taking the mmu_lock and
865 * count is also read inside the mmu_lock critical section.
867 kvm->mmu_notifier_count++;
868 for (; start < end; start += PAGE_SIZE)
869 need_tlb_flush |= kvm_unmap_hva(kvm, start);
870 spin_unlock(&kvm->mmu_lock);
872 /* we've to flush the tlb before the pages can be freed */
874 kvm_flush_remote_tlbs(kvm);
877 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
878 struct mm_struct *mm,
882 struct kvm *kvm = mmu_notifier_to_kvm(mn);
884 spin_lock(&kvm->mmu_lock);
886 * This sequence increase will notify the kvm page fault that
887 * the page that is going to be mapped in the spte could have
890 kvm->mmu_notifier_seq++;
892 * The above sequence increase must be visible before the
893 * below count decrease but both values are read by the kvm
894 * page fault under mmu_lock spinlock so we don't need to add
895 * a smb_wmb() here in between the two.
897 kvm->mmu_notifier_count--;
898 spin_unlock(&kvm->mmu_lock);
900 BUG_ON(kvm->mmu_notifier_count < 0);
903 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
904 struct mm_struct *mm,
905 unsigned long address)
907 struct kvm *kvm = mmu_notifier_to_kvm(mn);
910 spin_lock(&kvm->mmu_lock);
911 young = kvm_age_hva(kvm, address);
912 spin_unlock(&kvm->mmu_lock);
915 kvm_flush_remote_tlbs(kvm);
920 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
921 struct mm_struct *mm)
923 struct kvm *kvm = mmu_notifier_to_kvm(mn);
924 kvm_arch_flush_shadow(kvm);
927 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
928 .invalidate_page = kvm_mmu_notifier_invalidate_page,
929 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
930 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
931 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
932 .release = kvm_mmu_notifier_release,
934 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
936 static struct kvm *kvm_create_vm(void)
938 struct kvm *kvm = kvm_arch_create_vm();
939 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
945 #ifdef CONFIG_HAVE_KVM_IRQCHIP
946 INIT_LIST_HEAD(&kvm->irq_routing);
947 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
950 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
951 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
954 return ERR_PTR(-ENOMEM);
956 kvm->coalesced_mmio_ring =
957 (struct kvm_coalesced_mmio_ring *)page_address(page);
960 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
963 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
964 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
966 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
975 kvm->mm = current->mm;
976 atomic_inc(&kvm->mm->mm_count);
977 spin_lock_init(&kvm->mmu_lock);
978 spin_lock_init(&kvm->requests_lock);
979 kvm_io_bus_init(&kvm->pio_bus);
981 mutex_init(&kvm->lock);
982 mutex_init(&kvm->irq_lock);
983 kvm_io_bus_init(&kvm->mmio_bus);
984 init_rwsem(&kvm->slots_lock);
985 atomic_set(&kvm->users_count, 1);
986 spin_lock(&kvm_lock);
987 list_add(&kvm->vm_list, &vm_list);
988 spin_unlock(&kvm_lock);
989 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
990 kvm_coalesced_mmio_init(kvm);
997 * Free any memory in @free but not in @dont.
999 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
1000 struct kvm_memory_slot *dont)
1002 if (!dont || free->rmap != dont->rmap)
1005 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
1006 vfree(free->dirty_bitmap);
1008 if (!dont || free->lpage_info != dont->lpage_info)
1009 vfree(free->lpage_info);
1012 free->dirty_bitmap = NULL;
1014 free->lpage_info = NULL;
1017 void kvm_free_physmem(struct kvm *kvm)
1021 for (i = 0; i < kvm->nmemslots; ++i)
1022 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
1025 static void kvm_destroy_vm(struct kvm *kvm)
1027 struct mm_struct *mm = kvm->mm;
1029 kvm_arch_sync_events(kvm);
1030 spin_lock(&kvm_lock);
1031 list_del(&kvm->vm_list);
1032 spin_unlock(&kvm_lock);
1033 kvm_free_irq_routing(kvm);
1034 kvm_io_bus_destroy(&kvm->pio_bus);
1035 kvm_io_bus_destroy(&kvm->mmio_bus);
1036 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1037 if (kvm->coalesced_mmio_ring != NULL)
1038 free_page((unsigned long)kvm->coalesced_mmio_ring);
1040 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1041 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
1043 kvm_arch_flush_shadow(kvm);
1045 kvm_arch_destroy_vm(kvm);
1049 void kvm_get_kvm(struct kvm *kvm)
1051 atomic_inc(&kvm->users_count);
1053 EXPORT_SYMBOL_GPL(kvm_get_kvm);
1055 void kvm_put_kvm(struct kvm *kvm)
1057 if (atomic_dec_and_test(&kvm->users_count))
1058 kvm_destroy_vm(kvm);
1060 EXPORT_SYMBOL_GPL(kvm_put_kvm);
1063 static int kvm_vm_release(struct inode *inode, struct file *filp)
1065 struct kvm *kvm = filp->private_data;
1067 kvm_irqfd_release(kvm);
1074 * Allocate some memory and give it an address in the guest physical address
1077 * Discontiguous memory is allowed, mostly for framebuffers.
1079 * Must be called holding mmap_sem for write.
1081 int __kvm_set_memory_region(struct kvm *kvm,
1082 struct kvm_userspace_memory_region *mem,
1087 unsigned long npages, ugfn;
1088 unsigned long largepages, i;
1089 struct kvm_memory_slot *memslot;
1090 struct kvm_memory_slot old, new;
1093 /* General sanity checks */
1094 if (mem->memory_size & (PAGE_SIZE - 1))
1096 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
1098 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
1100 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
1102 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
1105 memslot = &kvm->memslots[mem->slot];
1106 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
1107 npages = mem->memory_size >> PAGE_SHIFT;
1110 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
1112 new = old = *memslot;
1114 new.base_gfn = base_gfn;
1115 new.npages = npages;
1116 new.flags = mem->flags;
1118 /* Disallow changing a memory slot's size. */
1120 if (npages && old.npages && npages != old.npages)
1123 /* Check for overlaps */
1125 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1126 struct kvm_memory_slot *s = &kvm->memslots[i];
1128 if (s == memslot || !s->npages)
1130 if (!((base_gfn + npages <= s->base_gfn) ||
1131 (base_gfn >= s->base_gfn + s->npages)))
1135 /* Free page dirty bitmap if unneeded */
1136 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1137 new.dirty_bitmap = NULL;
1141 /* Allocate if a slot is being created */
1143 if (npages && !new.rmap) {
1144 new.rmap = vmalloc(npages * sizeof(struct page *));
1149 memset(new.rmap, 0, npages * sizeof(*new.rmap));
1151 new.user_alloc = user_alloc;
1153 * hva_to_rmmap() serialzies with the mmu_lock and to be
1154 * safe it has to ignore memslots with !user_alloc &&
1158 new.userspace_addr = mem->userspace_addr;
1160 new.userspace_addr = 0;
1162 if (npages && !new.lpage_info) {
1163 largepages = 1 + (base_gfn + npages - 1) / KVM_PAGES_PER_HPAGE;
1164 largepages -= base_gfn / KVM_PAGES_PER_HPAGE;
1166 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
1168 if (!new.lpage_info)
1171 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
1173 if (base_gfn % KVM_PAGES_PER_HPAGE)
1174 new.lpage_info[0].write_count = 1;
1175 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
1176 new.lpage_info[largepages-1].write_count = 1;
1177 ugfn = new.userspace_addr >> PAGE_SHIFT;
1179 * If the gfn and userspace address are not aligned wrt each
1180 * other, disable large page support for this slot
1182 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE - 1))
1183 for (i = 0; i < largepages; ++i)
1184 new.lpage_info[i].write_count = 1;
1187 /* Allocate page dirty bitmap if needed */
1188 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1189 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
1191 new.dirty_bitmap = vmalloc(dirty_bytes);
1192 if (!new.dirty_bitmap)
1194 memset(new.dirty_bitmap, 0, dirty_bytes);
1196 kvm_arch_flush_shadow(kvm);
1198 #endif /* not defined CONFIG_S390 */
1201 kvm_arch_flush_shadow(kvm);
1203 spin_lock(&kvm->mmu_lock);
1204 if (mem->slot >= kvm->nmemslots)
1205 kvm->nmemslots = mem->slot + 1;
1208 spin_unlock(&kvm->mmu_lock);
1210 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
1212 spin_lock(&kvm->mmu_lock);
1214 spin_unlock(&kvm->mmu_lock);
1218 kvm_free_physmem_slot(&old, npages ? &new : NULL);
1219 /* Slot deletion case: we have to update the current slot */
1220 spin_lock(&kvm->mmu_lock);
1223 spin_unlock(&kvm->mmu_lock);
1225 /* map the pages in iommu page table */
1226 r = kvm_iommu_map_pages(kvm, base_gfn, npages);
1233 kvm_free_physmem_slot(&new, &old);
1238 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1240 int kvm_set_memory_region(struct kvm *kvm,
1241 struct kvm_userspace_memory_region *mem,
1246 down_write(&kvm->slots_lock);
1247 r = __kvm_set_memory_region(kvm, mem, user_alloc);
1248 up_write(&kvm->slots_lock);
1251 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1253 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1255 kvm_userspace_memory_region *mem,
1258 if (mem->slot >= KVM_MEMORY_SLOTS)
1260 return kvm_set_memory_region(kvm, mem, user_alloc);
1263 int kvm_get_dirty_log(struct kvm *kvm,
1264 struct kvm_dirty_log *log, int *is_dirty)
1266 struct kvm_memory_slot *memslot;
1269 unsigned long any = 0;
1272 if (log->slot >= KVM_MEMORY_SLOTS)
1275 memslot = &kvm->memslots[log->slot];
1277 if (!memslot->dirty_bitmap)
1280 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1282 for (i = 0; !any && i < n/sizeof(long); ++i)
1283 any = memslot->dirty_bitmap[i];
1286 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1297 int is_error_page(struct page *page)
1299 return page == bad_page;
1301 EXPORT_SYMBOL_GPL(is_error_page);
1303 int is_error_pfn(pfn_t pfn)
1305 return pfn == bad_pfn;
1307 EXPORT_SYMBOL_GPL(is_error_pfn);
1309 static inline unsigned long bad_hva(void)
1314 int kvm_is_error_hva(unsigned long addr)
1316 return addr == bad_hva();
1318 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1320 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
1324 for (i = 0; i < kvm->nmemslots; ++i) {
1325 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1327 if (gfn >= memslot->base_gfn
1328 && gfn < memslot->base_gfn + memslot->npages)
1333 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
1335 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1337 gfn = unalias_gfn(kvm, gfn);
1338 return gfn_to_memslot_unaliased(kvm, gfn);
1341 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1345 gfn = unalias_gfn(kvm, gfn);
1346 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1347 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1349 if (gfn >= memslot->base_gfn
1350 && gfn < memslot->base_gfn + memslot->npages)
1355 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1357 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1359 struct kvm_memory_slot *slot;
1361 gfn = unalias_gfn(kvm, gfn);
1362 slot = gfn_to_memslot_unaliased(kvm, gfn);
1365 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
1367 EXPORT_SYMBOL_GPL(gfn_to_hva);
1369 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1371 struct page *page[1];
1378 addr = gfn_to_hva(kvm, gfn);
1379 if (kvm_is_error_hva(addr)) {
1381 return page_to_pfn(bad_page);
1384 npages = get_user_pages_fast(addr, 1, 1, page);
1386 if (unlikely(npages != 1)) {
1387 struct vm_area_struct *vma;
1389 down_read(¤t->mm->mmap_sem);
1390 vma = find_vma(current->mm, addr);
1392 if (vma == NULL || addr < vma->vm_start ||
1393 !(vma->vm_flags & VM_PFNMAP)) {
1394 up_read(¤t->mm->mmap_sem);
1396 return page_to_pfn(bad_page);
1399 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1400 up_read(¤t->mm->mmap_sem);
1401 BUG_ON(!kvm_is_mmio_pfn(pfn));
1403 pfn = page_to_pfn(page[0]);
1408 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1410 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1414 pfn = gfn_to_pfn(kvm, gfn);
1415 if (!kvm_is_mmio_pfn(pfn))
1416 return pfn_to_page(pfn);
1418 WARN_ON(kvm_is_mmio_pfn(pfn));
1424 EXPORT_SYMBOL_GPL(gfn_to_page);
1426 void kvm_release_page_clean(struct page *page)
1428 kvm_release_pfn_clean(page_to_pfn(page));
1430 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1432 void kvm_release_pfn_clean(pfn_t pfn)
1434 if (!kvm_is_mmio_pfn(pfn))
1435 put_page(pfn_to_page(pfn));
1437 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1439 void kvm_release_page_dirty(struct page *page)
1441 kvm_release_pfn_dirty(page_to_pfn(page));
1443 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1445 void kvm_release_pfn_dirty(pfn_t pfn)
1447 kvm_set_pfn_dirty(pfn);
1448 kvm_release_pfn_clean(pfn);
1450 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1452 void kvm_set_page_dirty(struct page *page)
1454 kvm_set_pfn_dirty(page_to_pfn(page));
1456 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1458 void kvm_set_pfn_dirty(pfn_t pfn)
1460 if (!kvm_is_mmio_pfn(pfn)) {
1461 struct page *page = pfn_to_page(pfn);
1462 if (!PageReserved(page))
1466 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1468 void kvm_set_pfn_accessed(pfn_t pfn)
1470 if (!kvm_is_mmio_pfn(pfn))
1471 mark_page_accessed(pfn_to_page(pfn));
1473 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1475 void kvm_get_pfn(pfn_t pfn)
1477 if (!kvm_is_mmio_pfn(pfn))
1478 get_page(pfn_to_page(pfn));
1480 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1482 static int next_segment(unsigned long len, int offset)
1484 if (len > PAGE_SIZE - offset)
1485 return PAGE_SIZE - offset;
1490 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1496 addr = gfn_to_hva(kvm, gfn);
1497 if (kvm_is_error_hva(addr))
1499 r = copy_from_user(data, (void __user *)addr + offset, len);
1504 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1506 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1508 gfn_t gfn = gpa >> PAGE_SHIFT;
1510 int offset = offset_in_page(gpa);
1513 while ((seg = next_segment(len, offset)) != 0) {
1514 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1524 EXPORT_SYMBOL_GPL(kvm_read_guest);
1526 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1531 gfn_t gfn = gpa >> PAGE_SHIFT;
1532 int offset = offset_in_page(gpa);
1534 addr = gfn_to_hva(kvm, gfn);
1535 if (kvm_is_error_hva(addr))
1537 pagefault_disable();
1538 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1544 EXPORT_SYMBOL(kvm_read_guest_atomic);
1546 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1547 int offset, int len)
1552 addr = gfn_to_hva(kvm, gfn);
1553 if (kvm_is_error_hva(addr))
1555 r = copy_to_user((void __user *)addr + offset, data, len);
1558 mark_page_dirty(kvm, gfn);
1561 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1563 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1566 gfn_t gfn = gpa >> PAGE_SHIFT;
1568 int offset = offset_in_page(gpa);
1571 while ((seg = next_segment(len, offset)) != 0) {
1572 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1583 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1585 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1587 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1589 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1591 gfn_t gfn = gpa >> PAGE_SHIFT;
1593 int offset = offset_in_page(gpa);
1596 while ((seg = next_segment(len, offset)) != 0) {
1597 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1606 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1608 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1610 struct kvm_memory_slot *memslot;
1612 gfn = unalias_gfn(kvm, gfn);
1613 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1614 if (memslot && memslot->dirty_bitmap) {
1615 unsigned long rel_gfn = gfn - memslot->base_gfn;
1618 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1619 set_bit(rel_gfn, memslot->dirty_bitmap);
1624 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1626 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1631 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1633 if ((kvm_arch_interrupt_allowed(vcpu) &&
1634 kvm_cpu_has_interrupt(vcpu)) ||
1635 kvm_arch_vcpu_runnable(vcpu)) {
1636 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1639 if (kvm_cpu_has_pending_timer(vcpu))
1641 if (signal_pending(current))
1649 finish_wait(&vcpu->wq, &wait);
1652 void kvm_resched(struct kvm_vcpu *vcpu)
1654 if (!need_resched())
1658 EXPORT_SYMBOL_GPL(kvm_resched);
1660 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1662 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1665 if (vmf->pgoff == 0)
1666 page = virt_to_page(vcpu->run);
1668 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1669 page = virt_to_page(vcpu->arch.pio_data);
1671 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1672 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1673 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1676 return VM_FAULT_SIGBUS;
1682 static struct vm_operations_struct kvm_vcpu_vm_ops = {
1683 .fault = kvm_vcpu_fault,
1686 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1688 vma->vm_ops = &kvm_vcpu_vm_ops;
1692 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1694 struct kvm_vcpu *vcpu = filp->private_data;
1696 kvm_put_kvm(vcpu->kvm);
1700 static struct file_operations kvm_vcpu_fops = {
1701 .release = kvm_vcpu_release,
1702 .unlocked_ioctl = kvm_vcpu_ioctl,
1703 .compat_ioctl = kvm_vcpu_ioctl,
1704 .mmap = kvm_vcpu_mmap,
1708 * Allocates an inode for the vcpu.
1710 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1712 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1716 * Creates some virtual cpus. Good luck creating more than one.
1718 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1721 struct kvm_vcpu *vcpu;
1723 vcpu = kvm_arch_vcpu_create(kvm, id);
1725 return PTR_ERR(vcpu);
1727 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1729 r = kvm_arch_vcpu_setup(vcpu);
1733 mutex_lock(&kvm->lock);
1734 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1739 for (r = 0; r < atomic_read(&kvm->online_vcpus); r++)
1740 if (kvm->vcpus[r]->vcpu_id == id) {
1745 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1747 /* Now it's all set up, let userspace reach it */
1749 r = create_vcpu_fd(vcpu);
1755 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1757 atomic_inc(&kvm->online_vcpus);
1759 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1760 if (kvm->bsp_vcpu_id == id)
1761 kvm->bsp_vcpu = vcpu;
1763 mutex_unlock(&kvm->lock);
1767 mutex_unlock(&kvm->lock);
1768 kvm_arch_vcpu_destroy(vcpu);
1772 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1775 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1776 vcpu->sigset_active = 1;
1777 vcpu->sigset = *sigset;
1779 vcpu->sigset_active = 0;
1783 #ifdef __KVM_HAVE_MSIX
1784 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
1785 struct kvm_assigned_msix_nr *entry_nr)
1788 struct kvm_assigned_dev_kernel *adev;
1790 mutex_lock(&kvm->lock);
1792 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1793 entry_nr->assigned_dev_id);
1799 if (adev->entries_nr == 0) {
1800 adev->entries_nr = entry_nr->entry_nr;
1801 if (adev->entries_nr == 0 ||
1802 adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
1807 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
1810 if (!adev->host_msix_entries) {
1814 adev->guest_msix_entries = kzalloc(
1815 sizeof(struct kvm_guest_msix_entry) *
1816 entry_nr->entry_nr, GFP_KERNEL);
1817 if (!adev->guest_msix_entries) {
1818 kfree(adev->host_msix_entries);
1822 } else /* Not allowed set MSI-X number twice */
1825 mutex_unlock(&kvm->lock);
1829 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
1830 struct kvm_assigned_msix_entry *entry)
1833 struct kvm_assigned_dev_kernel *adev;
1835 mutex_lock(&kvm->lock);
1837 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1838 entry->assigned_dev_id);
1842 goto msix_entry_out;
1845 for (i = 0; i < adev->entries_nr; i++)
1846 if (adev->guest_msix_entries[i].vector == 0 ||
1847 adev->guest_msix_entries[i].entry == entry->entry) {
1848 adev->guest_msix_entries[i].entry = entry->entry;
1849 adev->guest_msix_entries[i].vector = entry->gsi;
1850 adev->host_msix_entries[i].entry = entry->entry;
1853 if (i == adev->entries_nr) {
1855 goto msix_entry_out;
1859 mutex_unlock(&kvm->lock);
1865 static long kvm_vcpu_ioctl(struct file *filp,
1866 unsigned int ioctl, unsigned long arg)
1868 struct kvm_vcpu *vcpu = filp->private_data;
1869 void __user *argp = (void __user *)arg;
1871 struct kvm_fpu *fpu = NULL;
1872 struct kvm_sregs *kvm_sregs = NULL;
1874 if (vcpu->kvm->mm != current->mm)
1881 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1883 case KVM_GET_REGS: {
1884 struct kvm_regs *kvm_regs;
1887 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1890 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1894 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1901 case KVM_SET_REGS: {
1902 struct kvm_regs *kvm_regs;
1905 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1909 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1911 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1919 case KVM_GET_SREGS: {
1920 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1924 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1928 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1933 case KVM_SET_SREGS: {
1934 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1939 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1941 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1947 case KVM_GET_MP_STATE: {
1948 struct kvm_mp_state mp_state;
1950 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1954 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1959 case KVM_SET_MP_STATE: {
1960 struct kvm_mp_state mp_state;
1963 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1965 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1971 case KVM_TRANSLATE: {
1972 struct kvm_translation tr;
1975 if (copy_from_user(&tr, argp, sizeof tr))
1977 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1981 if (copy_to_user(argp, &tr, sizeof tr))
1986 case KVM_SET_GUEST_DEBUG: {
1987 struct kvm_guest_debug dbg;
1990 if (copy_from_user(&dbg, argp, sizeof dbg))
1992 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1998 case KVM_SET_SIGNAL_MASK: {
1999 struct kvm_signal_mask __user *sigmask_arg = argp;
2000 struct kvm_signal_mask kvm_sigmask;
2001 sigset_t sigset, *p;
2006 if (copy_from_user(&kvm_sigmask, argp,
2007 sizeof kvm_sigmask))
2010 if (kvm_sigmask.len != sizeof sigset)
2013 if (copy_from_user(&sigset, sigmask_arg->sigset,
2018 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2022 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2026 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2030 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2036 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2041 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
2043 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2050 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2058 static long kvm_vm_ioctl(struct file *filp,
2059 unsigned int ioctl, unsigned long arg)
2061 struct kvm *kvm = filp->private_data;
2062 void __user *argp = (void __user *)arg;
2065 if (kvm->mm != current->mm)
2068 case KVM_CREATE_VCPU:
2069 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2073 case KVM_SET_USER_MEMORY_REGION: {
2074 struct kvm_userspace_memory_region kvm_userspace_mem;
2077 if (copy_from_user(&kvm_userspace_mem, argp,
2078 sizeof kvm_userspace_mem))
2081 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
2086 case KVM_GET_DIRTY_LOG: {
2087 struct kvm_dirty_log log;
2090 if (copy_from_user(&log, argp, sizeof log))
2092 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2097 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2098 case KVM_REGISTER_COALESCED_MMIO: {
2099 struct kvm_coalesced_mmio_zone zone;
2101 if (copy_from_user(&zone, argp, sizeof zone))
2104 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2110 case KVM_UNREGISTER_COALESCED_MMIO: {
2111 struct kvm_coalesced_mmio_zone zone;
2113 if (copy_from_user(&zone, argp, sizeof zone))
2116 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2123 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
2124 case KVM_ASSIGN_PCI_DEVICE: {
2125 struct kvm_assigned_pci_dev assigned_dev;
2128 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
2130 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
2135 case KVM_ASSIGN_IRQ: {
2139 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
2140 case KVM_ASSIGN_DEV_IRQ: {
2141 struct kvm_assigned_irq assigned_irq;
2144 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
2146 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
2151 case KVM_DEASSIGN_DEV_IRQ: {
2152 struct kvm_assigned_irq assigned_irq;
2155 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
2157 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
2164 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
2165 case KVM_DEASSIGN_PCI_DEVICE: {
2166 struct kvm_assigned_pci_dev assigned_dev;
2169 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
2171 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
2177 #ifdef KVM_CAP_IRQ_ROUTING
2178 case KVM_SET_GSI_ROUTING: {
2179 struct kvm_irq_routing routing;
2180 struct kvm_irq_routing __user *urouting;
2181 struct kvm_irq_routing_entry *entries;
2184 if (copy_from_user(&routing, argp, sizeof(routing)))
2187 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2192 entries = vmalloc(routing.nr * sizeof(*entries));
2197 if (copy_from_user(entries, urouting->entries,
2198 routing.nr * sizeof(*entries)))
2199 goto out_free_irq_routing;
2200 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2202 out_free_irq_routing:
2206 #ifdef __KVM_HAVE_MSIX
2207 case KVM_ASSIGN_SET_MSIX_NR: {
2208 struct kvm_assigned_msix_nr entry_nr;
2210 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
2212 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
2217 case KVM_ASSIGN_SET_MSIX_ENTRY: {
2218 struct kvm_assigned_msix_entry entry;
2220 if (copy_from_user(&entry, argp, sizeof entry))
2222 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
2228 #endif /* KVM_CAP_IRQ_ROUTING */
2230 struct kvm_irqfd data;
2233 if (copy_from_user(&data, argp, sizeof data))
2235 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2238 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2239 case KVM_SET_BOOT_CPU_ID:
2241 if (atomic_read(&kvm->online_vcpus) != 0)
2244 kvm->bsp_vcpu_id = arg;
2248 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2254 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2256 struct page *page[1];
2259 gfn_t gfn = vmf->pgoff;
2260 struct kvm *kvm = vma->vm_file->private_data;
2262 addr = gfn_to_hva(kvm, gfn);
2263 if (kvm_is_error_hva(addr))
2264 return VM_FAULT_SIGBUS;
2266 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2268 if (unlikely(npages != 1))
2269 return VM_FAULT_SIGBUS;
2271 vmf->page = page[0];
2275 static struct vm_operations_struct kvm_vm_vm_ops = {
2276 .fault = kvm_vm_fault,
2279 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2281 vma->vm_ops = &kvm_vm_vm_ops;
2285 static struct file_operations kvm_vm_fops = {
2286 .release = kvm_vm_release,
2287 .unlocked_ioctl = kvm_vm_ioctl,
2288 .compat_ioctl = kvm_vm_ioctl,
2289 .mmap = kvm_vm_mmap,
2292 static int kvm_dev_ioctl_create_vm(void)
2297 kvm = kvm_create_vm();
2299 return PTR_ERR(kvm);
2300 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
2307 static long kvm_dev_ioctl_check_extension_generic(long arg)
2310 case KVM_CAP_USER_MEMORY:
2311 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2312 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2313 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2314 case KVM_CAP_SET_BOOT_CPU_ID:
2317 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2318 case KVM_CAP_IRQ_ROUTING:
2319 return KVM_MAX_IRQ_ROUTES;
2324 return kvm_dev_ioctl_check_extension(arg);
2327 static long kvm_dev_ioctl(struct file *filp,
2328 unsigned int ioctl, unsigned long arg)
2333 case KVM_GET_API_VERSION:
2337 r = KVM_API_VERSION;
2343 r = kvm_dev_ioctl_create_vm();
2345 case KVM_CHECK_EXTENSION:
2346 r = kvm_dev_ioctl_check_extension_generic(arg);
2348 case KVM_GET_VCPU_MMAP_SIZE:
2352 r = PAGE_SIZE; /* struct kvm_run */
2354 r += PAGE_SIZE; /* pio data page */
2356 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2357 r += PAGE_SIZE; /* coalesced mmio ring page */
2360 case KVM_TRACE_ENABLE:
2361 case KVM_TRACE_PAUSE:
2362 case KVM_TRACE_DISABLE:
2363 r = kvm_trace_ioctl(ioctl, arg);
2366 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2372 static struct file_operations kvm_chardev_ops = {
2373 .unlocked_ioctl = kvm_dev_ioctl,
2374 .compat_ioctl = kvm_dev_ioctl,
2377 static struct miscdevice kvm_dev = {
2383 static void hardware_enable(void *junk)
2385 int cpu = raw_smp_processor_id();
2387 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2389 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2390 kvm_arch_hardware_enable(NULL);
2393 static void hardware_disable(void *junk)
2395 int cpu = raw_smp_processor_id();
2397 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2399 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2400 kvm_arch_hardware_disable(NULL);
2403 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2408 val &= ~CPU_TASKS_FROZEN;
2411 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2413 hardware_disable(NULL);
2415 case CPU_UP_CANCELED:
2416 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2418 smp_call_function_single(cpu, hardware_disable, NULL, 1);
2421 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2423 smp_call_function_single(cpu, hardware_enable, NULL, 1);
2430 asmlinkage void kvm_handle_fault_on_reboot(void)
2433 /* spin while reset goes on */
2436 /* Fault while not rebooting. We want the trace. */
2439 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2441 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2445 * Some (well, at least mine) BIOSes hang on reboot if
2448 * And Intel TXT required VMX off for all cpu when system shutdown.
2450 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2451 kvm_rebooting = true;
2452 on_each_cpu(hardware_disable, NULL, 1);
2456 static struct notifier_block kvm_reboot_notifier = {
2457 .notifier_call = kvm_reboot,
2461 void kvm_io_bus_init(struct kvm_io_bus *bus)
2463 memset(bus, 0, sizeof(*bus));
2466 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2470 for (i = 0; i < bus->dev_count; i++) {
2471 struct kvm_io_device *pos = bus->devs[i];
2473 kvm_iodevice_destructor(pos);
2477 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
2478 gpa_t addr, int len, int is_write)
2482 for (i = 0; i < bus->dev_count; i++) {
2483 struct kvm_io_device *pos = bus->devs[i];
2485 if (kvm_iodevice_in_range(pos, addr, len, is_write))
2492 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2494 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2496 bus->devs[bus->dev_count++] = dev;
2499 static struct notifier_block kvm_cpu_notifier = {
2500 .notifier_call = kvm_cpu_hotplug,
2501 .priority = 20, /* must be > scheduler priority */
2504 static int vm_stat_get(void *_offset, u64 *val)
2506 unsigned offset = (long)_offset;
2510 spin_lock(&kvm_lock);
2511 list_for_each_entry(kvm, &vm_list, vm_list)
2512 *val += *(u32 *)((void *)kvm + offset);
2513 spin_unlock(&kvm_lock);
2517 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2519 static int vcpu_stat_get(void *_offset, u64 *val)
2521 unsigned offset = (long)_offset;
2523 struct kvm_vcpu *vcpu;
2527 spin_lock(&kvm_lock);
2528 list_for_each_entry(kvm, &vm_list, vm_list)
2529 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2530 vcpu = kvm->vcpus[i];
2532 *val += *(u32 *)((void *)vcpu + offset);
2534 spin_unlock(&kvm_lock);
2538 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2540 static struct file_operations *stat_fops[] = {
2541 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2542 [KVM_STAT_VM] = &vm_stat_fops,
2545 static void kvm_init_debug(void)
2547 struct kvm_stats_debugfs_item *p;
2549 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2550 for (p = debugfs_entries; p->name; ++p)
2551 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2552 (void *)(long)p->offset,
2553 stat_fops[p->kind]);
2556 static void kvm_exit_debug(void)
2558 struct kvm_stats_debugfs_item *p;
2560 for (p = debugfs_entries; p->name; ++p)
2561 debugfs_remove(p->dentry);
2562 debugfs_remove(kvm_debugfs_dir);
2565 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2567 hardware_disable(NULL);
2571 static int kvm_resume(struct sys_device *dev)
2573 hardware_enable(NULL);
2577 static struct sysdev_class kvm_sysdev_class = {
2579 .suspend = kvm_suspend,
2580 .resume = kvm_resume,
2583 static struct sys_device kvm_sysdev = {
2585 .cls = &kvm_sysdev_class,
2588 struct page *bad_page;
2592 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2594 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2597 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2599 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2601 kvm_arch_vcpu_load(vcpu, cpu);
2604 static void kvm_sched_out(struct preempt_notifier *pn,
2605 struct task_struct *next)
2607 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2609 kvm_arch_vcpu_put(vcpu);
2612 int kvm_init(void *opaque, unsigned int vcpu_size,
2613 struct module *module)
2620 r = kvm_arch_init(opaque);
2624 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2626 if (bad_page == NULL) {
2631 bad_pfn = page_to_pfn(bad_page);
2633 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2638 r = kvm_arch_hardware_setup();
2642 for_each_online_cpu(cpu) {
2643 smp_call_function_single(cpu,
2644 kvm_arch_check_processor_compat,
2650 on_each_cpu(hardware_enable, NULL, 1);
2651 r = register_cpu_notifier(&kvm_cpu_notifier);
2654 register_reboot_notifier(&kvm_reboot_notifier);
2656 r = sysdev_class_register(&kvm_sysdev_class);
2660 r = sysdev_register(&kvm_sysdev);
2664 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2665 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2666 __alignof__(struct kvm_vcpu),
2668 if (!kvm_vcpu_cache) {
2673 kvm_chardev_ops.owner = module;
2674 kvm_vm_fops.owner = module;
2675 kvm_vcpu_fops.owner = module;
2677 r = misc_register(&kvm_dev);
2679 printk(KERN_ERR "kvm: misc device register failed\n");
2683 kvm_preempt_ops.sched_in = kvm_sched_in;
2684 kvm_preempt_ops.sched_out = kvm_sched_out;
2689 kmem_cache_destroy(kvm_vcpu_cache);
2691 sysdev_unregister(&kvm_sysdev);
2693 sysdev_class_unregister(&kvm_sysdev_class);
2695 unregister_reboot_notifier(&kvm_reboot_notifier);
2696 unregister_cpu_notifier(&kvm_cpu_notifier);
2698 on_each_cpu(hardware_disable, NULL, 1);
2700 kvm_arch_hardware_unsetup();
2702 free_cpumask_var(cpus_hardware_enabled);
2704 __free_page(bad_page);
2711 EXPORT_SYMBOL_GPL(kvm_init);
2715 kvm_trace_cleanup();
2716 misc_deregister(&kvm_dev);
2717 kmem_cache_destroy(kvm_vcpu_cache);
2718 sysdev_unregister(&kvm_sysdev);
2719 sysdev_class_unregister(&kvm_sysdev_class);
2720 unregister_reboot_notifier(&kvm_reboot_notifier);
2721 unregister_cpu_notifier(&kvm_cpu_notifier);
2722 on_each_cpu(hardware_disable, NULL, 1);
2723 kvm_arch_hardware_unsetup();
2726 free_cpumask_var(cpus_hardware_enabled);
2727 __free_page(bad_page);
2729 EXPORT_SYMBOL_GPL(kvm_exit);