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>
46 #include <asm/processor.h>
48 #include <asm/uaccess.h>
49 #include <asm/pgtable.h>
51 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
52 #include "coalesced_mmio.h"
55 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
56 #include <linux/pci.h>
57 #include <linux/interrupt.h>
61 MODULE_AUTHOR("Qumranet");
62 MODULE_LICENSE("GPL");
64 DEFINE_SPINLOCK(kvm_lock);
67 static cpumask_var_t cpus_hardware_enabled;
69 struct kmem_cache *kvm_vcpu_cache;
70 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
72 static __read_mostly struct preempt_ops kvm_preempt_ops;
74 struct dentry *kvm_debugfs_dir;
76 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
79 static bool kvm_rebooting;
81 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
82 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
85 struct list_head *ptr;
86 struct kvm_assigned_dev_kernel *match;
88 list_for_each(ptr, head) {
89 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
90 if (match->assigned_dev_id == assigned_dev_id)
96 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
97 *assigned_dev, int irq)
100 struct msix_entry *host_msix_entries;
102 host_msix_entries = assigned_dev->host_msix_entries;
105 for (i = 0; i < assigned_dev->entries_nr; i++)
106 if (irq == host_msix_entries[i].vector) {
111 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
118 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
120 struct kvm_assigned_dev_kernel *assigned_dev;
124 assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
126 kvm = assigned_dev->kvm;
128 /* This is taken to safely inject irq inside the guest. When
129 * the interrupt injection (or the ioapic code) uses a
130 * finer-grained lock, update this
132 mutex_lock(&kvm->lock);
133 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
134 struct kvm_guest_msix_entry *guest_entries =
135 assigned_dev->guest_msix_entries;
136 for (i = 0; i < assigned_dev->entries_nr; i++) {
137 if (!(guest_entries[i].flags &
138 KVM_ASSIGNED_MSIX_PENDING))
140 guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
141 kvm_set_irq(assigned_dev->kvm,
142 assigned_dev->irq_source_id,
143 guest_entries[i].vector, 1);
144 irq = assigned_dev->host_msix_entries[i].vector;
147 assigned_dev->host_irq_disabled = false;
150 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
151 assigned_dev->guest_irq, 1);
152 if (assigned_dev->irq_requested_type &
153 KVM_DEV_IRQ_GUEST_MSI) {
154 enable_irq(assigned_dev->host_irq);
155 assigned_dev->host_irq_disabled = false;
159 mutex_unlock(&assigned_dev->kvm->lock);
162 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
164 struct kvm_assigned_dev_kernel *assigned_dev =
165 (struct kvm_assigned_dev_kernel *) dev_id;
167 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
168 int index = find_index_from_host_irq(assigned_dev, irq);
171 assigned_dev->guest_msix_entries[index].flags |=
172 KVM_ASSIGNED_MSIX_PENDING;
175 schedule_work(&assigned_dev->interrupt_work);
177 disable_irq_nosync(irq);
178 assigned_dev->host_irq_disabled = true;
183 /* Ack the irq line for an assigned device */
184 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
186 struct kvm_assigned_dev_kernel *dev;
191 dev = container_of(kian, struct kvm_assigned_dev_kernel,
194 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
196 /* The guest irq may be shared so this ack may be
197 * from another device.
199 if (dev->host_irq_disabled) {
200 enable_irq(dev->host_irq);
201 dev->host_irq_disabled = false;
205 static void deassign_guest_irq(struct kvm *kvm,
206 struct kvm_assigned_dev_kernel *assigned_dev)
208 kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
209 assigned_dev->ack_notifier.gsi = -1;
211 if (assigned_dev->irq_source_id != -1)
212 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
213 assigned_dev->irq_source_id = -1;
214 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
217 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
218 static void deassign_host_irq(struct kvm *kvm,
219 struct kvm_assigned_dev_kernel *assigned_dev)
222 * In kvm_free_device_irq, cancel_work_sync return true if:
223 * 1. work is scheduled, and then cancelled.
224 * 2. work callback is executed.
226 * The first one ensured that the irq is disabled and no more events
227 * would happen. But for the second one, the irq may be enabled (e.g.
228 * for MSI). So we disable irq here to prevent further events.
230 * Notice this maybe result in nested disable if the interrupt type is
231 * INTx, but it's OK for we are going to free it.
233 * If this function is a part of VM destroy, please ensure that till
234 * now, the kvm state is still legal for probably we also have to wait
235 * interrupt_work done.
237 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
239 for (i = 0; i < assigned_dev->entries_nr; i++)
240 disable_irq_nosync(assigned_dev->
241 host_msix_entries[i].vector);
243 cancel_work_sync(&assigned_dev->interrupt_work);
245 for (i = 0; i < assigned_dev->entries_nr; i++)
246 free_irq(assigned_dev->host_msix_entries[i].vector,
247 (void *)assigned_dev);
249 assigned_dev->entries_nr = 0;
250 kfree(assigned_dev->host_msix_entries);
251 kfree(assigned_dev->guest_msix_entries);
252 pci_disable_msix(assigned_dev->dev);
254 /* Deal with MSI and INTx */
255 disable_irq_nosync(assigned_dev->host_irq);
256 cancel_work_sync(&assigned_dev->interrupt_work);
258 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
260 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
261 pci_disable_msi(assigned_dev->dev);
264 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
267 static int kvm_deassign_irq(struct kvm *kvm,
268 struct kvm_assigned_dev_kernel *assigned_dev,
269 unsigned long irq_requested_type)
271 unsigned long guest_irq_type, host_irq_type;
273 if (!irqchip_in_kernel(kvm))
275 /* no irq assignment to deassign */
276 if (!assigned_dev->irq_requested_type)
279 host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
280 guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
283 deassign_host_irq(kvm, assigned_dev);
285 deassign_guest_irq(kvm, assigned_dev);
290 static void kvm_free_assigned_irq(struct kvm *kvm,
291 struct kvm_assigned_dev_kernel *assigned_dev)
293 kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
296 static void kvm_free_assigned_device(struct kvm *kvm,
297 struct kvm_assigned_dev_kernel
300 kvm_free_assigned_irq(kvm, assigned_dev);
302 pci_reset_function(assigned_dev->dev);
304 pci_release_regions(assigned_dev->dev);
305 pci_disable_device(assigned_dev->dev);
306 pci_dev_put(assigned_dev->dev);
308 list_del(&assigned_dev->list);
312 void kvm_free_all_assigned_devices(struct kvm *kvm)
314 struct list_head *ptr, *ptr2;
315 struct kvm_assigned_dev_kernel *assigned_dev;
317 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
318 assigned_dev = list_entry(ptr,
319 struct kvm_assigned_dev_kernel,
322 kvm_free_assigned_device(kvm, assigned_dev);
326 static int assigned_device_enable_host_intx(struct kvm *kvm,
327 struct kvm_assigned_dev_kernel *dev)
329 dev->host_irq = dev->dev->irq;
330 /* Even though this is PCI, we don't want to use shared
331 * interrupts. Sharing host devices with guest-assigned devices
332 * on the same interrupt line is not a happy situation: there
333 * are going to be long delays in accepting, acking, etc.
335 if (request_irq(dev->host_irq, kvm_assigned_dev_intr,
336 0, "kvm_assigned_intx_device", (void *)dev))
341 #ifdef __KVM_HAVE_MSI
342 static int assigned_device_enable_host_msi(struct kvm *kvm,
343 struct kvm_assigned_dev_kernel *dev)
347 if (!dev->dev->msi_enabled) {
348 r = pci_enable_msi(dev->dev);
353 dev->host_irq = dev->dev->irq;
354 if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0,
355 "kvm_assigned_msi_device", (void *)dev)) {
356 pci_disable_msi(dev->dev);
364 #ifdef __KVM_HAVE_MSIX
365 static int assigned_device_enable_host_msix(struct kvm *kvm,
366 struct kvm_assigned_dev_kernel *dev)
370 /* host_msix_entries and guest_msix_entries should have been
372 if (dev->entries_nr == 0)
375 r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
379 for (i = 0; i < dev->entries_nr; i++) {
380 r = request_irq(dev->host_msix_entries[i].vector,
381 kvm_assigned_dev_intr, 0,
382 "kvm_assigned_msix_device",
384 /* FIXME: free requested_irq's on failure */
394 static int assigned_device_enable_guest_intx(struct kvm *kvm,
395 struct kvm_assigned_dev_kernel *dev,
396 struct kvm_assigned_irq *irq)
398 dev->guest_irq = irq->guest_irq;
399 dev->ack_notifier.gsi = irq->guest_irq;
403 #ifdef __KVM_HAVE_MSI
404 static int assigned_device_enable_guest_msi(struct kvm *kvm,
405 struct kvm_assigned_dev_kernel *dev,
406 struct kvm_assigned_irq *irq)
408 dev->guest_irq = irq->guest_irq;
409 dev->ack_notifier.gsi = -1;
413 #ifdef __KVM_HAVE_MSIX
414 static int assigned_device_enable_guest_msix(struct kvm *kvm,
415 struct kvm_assigned_dev_kernel *dev,
416 struct kvm_assigned_irq *irq)
418 dev->guest_irq = irq->guest_irq;
419 dev->ack_notifier.gsi = -1;
424 static int assign_host_irq(struct kvm *kvm,
425 struct kvm_assigned_dev_kernel *dev,
430 if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
433 switch (host_irq_type) {
434 case KVM_DEV_IRQ_HOST_INTX:
435 r = assigned_device_enable_host_intx(kvm, dev);
437 #ifdef __KVM_HAVE_MSI
438 case KVM_DEV_IRQ_HOST_MSI:
439 r = assigned_device_enable_host_msi(kvm, dev);
442 #ifdef __KVM_HAVE_MSIX
443 case KVM_DEV_IRQ_HOST_MSIX:
444 r = assigned_device_enable_host_msix(kvm, dev);
452 dev->irq_requested_type |= host_irq_type;
457 static int assign_guest_irq(struct kvm *kvm,
458 struct kvm_assigned_dev_kernel *dev,
459 struct kvm_assigned_irq *irq,
460 unsigned long guest_irq_type)
465 if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
468 id = kvm_request_irq_source_id(kvm);
472 dev->irq_source_id = id;
474 switch (guest_irq_type) {
475 case KVM_DEV_IRQ_GUEST_INTX:
476 r = assigned_device_enable_guest_intx(kvm, dev, irq);
478 #ifdef __KVM_HAVE_MSI
479 case KVM_DEV_IRQ_GUEST_MSI:
480 r = assigned_device_enable_guest_msi(kvm, dev, irq);
483 #ifdef __KVM_HAVE_MSIX
484 case KVM_DEV_IRQ_GUEST_MSIX:
485 r = assigned_device_enable_guest_msix(kvm, dev, irq);
493 dev->irq_requested_type |= guest_irq_type;
494 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
496 kvm_free_irq_source_id(kvm, dev->irq_source_id);
501 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
502 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
503 struct kvm_assigned_irq *assigned_irq)
506 struct kvm_assigned_dev_kernel *match;
507 unsigned long host_irq_type, guest_irq_type;
509 if (!capable(CAP_SYS_RAWIO))
512 if (!irqchip_in_kernel(kvm))
515 mutex_lock(&kvm->lock);
517 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
518 assigned_irq->assigned_dev_id);
522 host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
523 guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
526 /* can only assign one type at a time */
527 if (hweight_long(host_irq_type) > 1)
529 if (hweight_long(guest_irq_type) > 1)
531 if (host_irq_type == 0 && guest_irq_type == 0)
536 r = assign_host_irq(kvm, match, host_irq_type);
541 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
543 mutex_unlock(&kvm->lock);
547 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
548 struct kvm_assigned_irq
552 struct kvm_assigned_dev_kernel *match;
554 mutex_lock(&kvm->lock);
556 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
557 assigned_irq->assigned_dev_id);
561 r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
563 mutex_unlock(&kvm->lock);
567 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
568 struct kvm_assigned_pci_dev *assigned_dev)
571 struct kvm_assigned_dev_kernel *match;
574 down_read(&kvm->slots_lock);
575 mutex_lock(&kvm->lock);
577 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
578 assigned_dev->assigned_dev_id);
580 /* device already assigned */
585 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
587 printk(KERN_INFO "%s: Couldn't allocate memory\n",
592 dev = pci_get_bus_and_slot(assigned_dev->busnr,
593 assigned_dev->devfn);
595 printk(KERN_INFO "%s: host device not found\n", __func__);
599 if (pci_enable_device(dev)) {
600 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
604 r = pci_request_regions(dev, "kvm_assigned_device");
606 printk(KERN_INFO "%s: Could not get access to device regions\n",
611 pci_reset_function(dev);
613 match->assigned_dev_id = assigned_dev->assigned_dev_id;
614 match->host_busnr = assigned_dev->busnr;
615 match->host_devfn = assigned_dev->devfn;
616 match->flags = assigned_dev->flags;
618 match->irq_source_id = -1;
620 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
621 INIT_WORK(&match->interrupt_work,
622 kvm_assigned_dev_interrupt_work_handler);
624 list_add(&match->list, &kvm->arch.assigned_dev_head);
626 if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
627 if (!kvm->arch.iommu_domain) {
628 r = kvm_iommu_map_guest(kvm);
632 r = kvm_assign_device(kvm, match);
638 mutex_unlock(&kvm->lock);
639 up_read(&kvm->slots_lock);
642 list_del(&match->list);
643 pci_release_regions(dev);
645 pci_disable_device(dev);
650 mutex_unlock(&kvm->lock);
651 up_read(&kvm->slots_lock);
656 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
657 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
658 struct kvm_assigned_pci_dev *assigned_dev)
661 struct kvm_assigned_dev_kernel *match;
663 mutex_lock(&kvm->lock);
665 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
666 assigned_dev->assigned_dev_id);
668 printk(KERN_INFO "%s: device hasn't been assigned before, "
669 "so cannot be deassigned\n", __func__);
674 if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
675 kvm_deassign_device(kvm, match);
677 kvm_free_assigned_device(kvm, match);
680 mutex_unlock(&kvm->lock);
685 static inline int valid_vcpu(int n)
687 return likely(n >= 0 && n < KVM_MAX_VCPUS);
690 inline int kvm_is_mmio_pfn(pfn_t pfn)
692 if (pfn_valid(pfn)) {
693 struct page *page = compound_head(pfn_to_page(pfn));
694 return PageReserved(page);
701 * Switches to specified vcpu, until a matching vcpu_put()
703 void vcpu_load(struct kvm_vcpu *vcpu)
707 mutex_lock(&vcpu->mutex);
709 preempt_notifier_register(&vcpu->preempt_notifier);
710 kvm_arch_vcpu_load(vcpu, cpu);
714 void vcpu_put(struct kvm_vcpu *vcpu)
717 kvm_arch_vcpu_put(vcpu);
718 preempt_notifier_unregister(&vcpu->preempt_notifier);
720 mutex_unlock(&vcpu->mutex);
723 static void ack_flush(void *_completed)
727 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
732 struct kvm_vcpu *vcpu;
734 if (alloc_cpumask_var(&cpus, GFP_ATOMIC))
738 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
739 vcpu = kvm->vcpus[i];
742 if (test_and_set_bit(req, &vcpu->requests))
745 if (cpus != NULL && cpu != -1 && cpu != me)
746 cpumask_set_cpu(cpu, cpus);
748 if (unlikely(cpus == NULL))
749 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
750 else if (!cpumask_empty(cpus))
751 smp_call_function_many(cpus, ack_flush, NULL, 1);
755 free_cpumask_var(cpus);
759 void kvm_flush_remote_tlbs(struct kvm *kvm)
761 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
762 ++kvm->stat.remote_tlb_flush;
765 void kvm_reload_remote_mmus(struct kvm *kvm)
767 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
770 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
775 mutex_init(&vcpu->mutex);
779 init_waitqueue_head(&vcpu->wq);
781 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
786 vcpu->run = page_address(page);
788 r = kvm_arch_vcpu_init(vcpu);
794 free_page((unsigned long)vcpu->run);
798 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
800 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
802 kvm_arch_vcpu_uninit(vcpu);
803 free_page((unsigned long)vcpu->run);
805 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
807 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
808 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
810 return container_of(mn, struct kvm, mmu_notifier);
813 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
814 struct mm_struct *mm,
815 unsigned long address)
817 struct kvm *kvm = mmu_notifier_to_kvm(mn);
821 * When ->invalidate_page runs, the linux pte has been zapped
822 * already but the page is still allocated until
823 * ->invalidate_page returns. So if we increase the sequence
824 * here the kvm page fault will notice if the spte can't be
825 * established because the page is going to be freed. If
826 * instead the kvm page fault establishes the spte before
827 * ->invalidate_page runs, kvm_unmap_hva will release it
830 * The sequence increase only need to be seen at spin_unlock
831 * time, and not at spin_lock time.
833 * Increasing the sequence after the spin_unlock would be
834 * unsafe because the kvm page fault could then establish the
835 * pte after kvm_unmap_hva returned, without noticing the page
836 * is going to be freed.
838 spin_lock(&kvm->mmu_lock);
839 kvm->mmu_notifier_seq++;
840 need_tlb_flush = kvm_unmap_hva(kvm, address);
841 spin_unlock(&kvm->mmu_lock);
843 /* we've to flush the tlb before the pages can be freed */
845 kvm_flush_remote_tlbs(kvm);
849 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
850 struct mm_struct *mm,
854 struct kvm *kvm = mmu_notifier_to_kvm(mn);
855 int need_tlb_flush = 0;
857 spin_lock(&kvm->mmu_lock);
859 * The count increase must become visible at unlock time as no
860 * spte can be established without taking the mmu_lock and
861 * count is also read inside the mmu_lock critical section.
863 kvm->mmu_notifier_count++;
864 for (; start < end; start += PAGE_SIZE)
865 need_tlb_flush |= kvm_unmap_hva(kvm, start);
866 spin_unlock(&kvm->mmu_lock);
868 /* we've to flush the tlb before the pages can be freed */
870 kvm_flush_remote_tlbs(kvm);
873 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
874 struct mm_struct *mm,
878 struct kvm *kvm = mmu_notifier_to_kvm(mn);
880 spin_lock(&kvm->mmu_lock);
882 * This sequence increase will notify the kvm page fault that
883 * the page that is going to be mapped in the spte could have
886 kvm->mmu_notifier_seq++;
888 * The above sequence increase must be visible before the
889 * below count decrease but both values are read by the kvm
890 * page fault under mmu_lock spinlock so we don't need to add
891 * a smb_wmb() here in between the two.
893 kvm->mmu_notifier_count--;
894 spin_unlock(&kvm->mmu_lock);
896 BUG_ON(kvm->mmu_notifier_count < 0);
899 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
900 struct mm_struct *mm,
901 unsigned long address)
903 struct kvm *kvm = mmu_notifier_to_kvm(mn);
906 spin_lock(&kvm->mmu_lock);
907 young = kvm_age_hva(kvm, address);
908 spin_unlock(&kvm->mmu_lock);
911 kvm_flush_remote_tlbs(kvm);
916 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
917 struct mm_struct *mm)
919 struct kvm *kvm = mmu_notifier_to_kvm(mn);
920 kvm_arch_flush_shadow(kvm);
923 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
924 .invalidate_page = kvm_mmu_notifier_invalidate_page,
925 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
926 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
927 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
928 .release = kvm_mmu_notifier_release,
930 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
932 static struct kvm *kvm_create_vm(void)
934 struct kvm *kvm = kvm_arch_create_vm();
935 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
941 #ifdef CONFIG_HAVE_KVM_IRQCHIP
942 INIT_LIST_HEAD(&kvm->irq_routing);
943 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
946 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
947 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
950 return ERR_PTR(-ENOMEM);
952 kvm->coalesced_mmio_ring =
953 (struct kvm_coalesced_mmio_ring *)page_address(page);
956 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
959 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
960 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
962 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
971 kvm->mm = current->mm;
972 atomic_inc(&kvm->mm->mm_count);
973 spin_lock_init(&kvm->mmu_lock);
974 kvm_io_bus_init(&kvm->pio_bus);
975 mutex_init(&kvm->lock);
976 kvm_io_bus_init(&kvm->mmio_bus);
977 init_rwsem(&kvm->slots_lock);
978 atomic_set(&kvm->users_count, 1);
979 spin_lock(&kvm_lock);
980 list_add(&kvm->vm_list, &vm_list);
981 spin_unlock(&kvm_lock);
982 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
983 kvm_coalesced_mmio_init(kvm);
990 * Free any memory in @free but not in @dont.
992 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
993 struct kvm_memory_slot *dont)
995 if (!dont || free->rmap != dont->rmap)
998 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
999 vfree(free->dirty_bitmap);
1001 if (!dont || free->lpage_info != dont->lpage_info)
1002 vfree(free->lpage_info);
1005 free->dirty_bitmap = NULL;
1007 free->lpage_info = NULL;
1010 void kvm_free_physmem(struct kvm *kvm)
1014 for (i = 0; i < kvm->nmemslots; ++i)
1015 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
1018 static void kvm_destroy_vm(struct kvm *kvm)
1020 struct mm_struct *mm = kvm->mm;
1022 kvm_arch_sync_events(kvm);
1023 spin_lock(&kvm_lock);
1024 list_del(&kvm->vm_list);
1025 spin_unlock(&kvm_lock);
1026 kvm_free_irq_routing(kvm);
1027 kvm_io_bus_destroy(&kvm->pio_bus);
1028 kvm_io_bus_destroy(&kvm->mmio_bus);
1029 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1030 if (kvm->coalesced_mmio_ring != NULL)
1031 free_page((unsigned long)kvm->coalesced_mmio_ring);
1033 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1034 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
1036 kvm_arch_flush_shadow(kvm);
1038 kvm_arch_destroy_vm(kvm);
1042 void kvm_get_kvm(struct kvm *kvm)
1044 atomic_inc(&kvm->users_count);
1046 EXPORT_SYMBOL_GPL(kvm_get_kvm);
1048 void kvm_put_kvm(struct kvm *kvm)
1050 if (atomic_dec_and_test(&kvm->users_count))
1051 kvm_destroy_vm(kvm);
1053 EXPORT_SYMBOL_GPL(kvm_put_kvm);
1056 static int kvm_vm_release(struct inode *inode, struct file *filp)
1058 struct kvm *kvm = filp->private_data;
1065 * Allocate some memory and give it an address in the guest physical address
1068 * Discontiguous memory is allowed, mostly for framebuffers.
1070 * Must be called holding mmap_sem for write.
1072 int __kvm_set_memory_region(struct kvm *kvm,
1073 struct kvm_userspace_memory_region *mem,
1078 unsigned long npages;
1081 struct kvm_memory_slot *memslot;
1082 struct kvm_memory_slot old, new;
1085 /* General sanity checks */
1086 if (mem->memory_size & (PAGE_SIZE - 1))
1088 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
1090 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
1092 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
1094 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
1097 memslot = &kvm->memslots[mem->slot];
1098 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
1099 npages = mem->memory_size >> PAGE_SHIFT;
1102 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
1104 new = old = *memslot;
1106 new.base_gfn = base_gfn;
1107 new.npages = npages;
1108 new.flags = mem->flags;
1110 /* Disallow changing a memory slot's size. */
1112 if (npages && old.npages && npages != old.npages)
1115 /* Check for overlaps */
1117 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1118 struct kvm_memory_slot *s = &kvm->memslots[i];
1120 if (s == memslot || !s->npages)
1122 if (!((base_gfn + npages <= s->base_gfn) ||
1123 (base_gfn >= s->base_gfn + s->npages)))
1127 /* Free page dirty bitmap if unneeded */
1128 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1129 new.dirty_bitmap = NULL;
1133 /* Allocate if a slot is being created */
1135 if (npages && !new.rmap) {
1136 new.rmap = vmalloc(npages * sizeof(struct page *));
1141 memset(new.rmap, 0, npages * sizeof(*new.rmap));
1143 new.user_alloc = user_alloc;
1145 * hva_to_rmmap() serialzies with the mmu_lock and to be
1146 * safe it has to ignore memslots with !user_alloc &&
1150 new.userspace_addr = mem->userspace_addr;
1152 new.userspace_addr = 0;
1154 if (npages && !new.lpage_info) {
1155 largepages = 1 + (base_gfn + npages - 1) / KVM_PAGES_PER_HPAGE;
1156 largepages -= base_gfn / KVM_PAGES_PER_HPAGE;
1158 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
1160 if (!new.lpage_info)
1163 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
1165 if (base_gfn % KVM_PAGES_PER_HPAGE)
1166 new.lpage_info[0].write_count = 1;
1167 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
1168 new.lpage_info[largepages-1].write_count = 1;
1171 /* Allocate page dirty bitmap if needed */
1172 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1173 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
1175 new.dirty_bitmap = vmalloc(dirty_bytes);
1176 if (!new.dirty_bitmap)
1178 memset(new.dirty_bitmap, 0, dirty_bytes);
1180 #endif /* not defined CONFIG_S390 */
1183 kvm_arch_flush_shadow(kvm);
1185 spin_lock(&kvm->mmu_lock);
1186 if (mem->slot >= kvm->nmemslots)
1187 kvm->nmemslots = mem->slot + 1;
1190 spin_unlock(&kvm->mmu_lock);
1192 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
1194 spin_lock(&kvm->mmu_lock);
1196 spin_unlock(&kvm->mmu_lock);
1200 kvm_free_physmem_slot(&old, npages ? &new : NULL);
1201 /* Slot deletion case: we have to update the current slot */
1205 /* map the pages in iommu page table */
1206 r = kvm_iommu_map_pages(kvm, base_gfn, npages);
1213 kvm_free_physmem_slot(&new, &old);
1218 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1220 int kvm_set_memory_region(struct kvm *kvm,
1221 struct kvm_userspace_memory_region *mem,
1226 down_write(&kvm->slots_lock);
1227 r = __kvm_set_memory_region(kvm, mem, user_alloc);
1228 up_write(&kvm->slots_lock);
1231 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1233 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1235 kvm_userspace_memory_region *mem,
1238 if (mem->slot >= KVM_MEMORY_SLOTS)
1240 return kvm_set_memory_region(kvm, mem, user_alloc);
1243 int kvm_get_dirty_log(struct kvm *kvm,
1244 struct kvm_dirty_log *log, int *is_dirty)
1246 struct kvm_memory_slot *memslot;
1249 unsigned long any = 0;
1252 if (log->slot >= KVM_MEMORY_SLOTS)
1255 memslot = &kvm->memslots[log->slot];
1257 if (!memslot->dirty_bitmap)
1260 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1262 for (i = 0; !any && i < n/sizeof(long); ++i)
1263 any = memslot->dirty_bitmap[i];
1266 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1277 int is_error_page(struct page *page)
1279 return page == bad_page;
1281 EXPORT_SYMBOL_GPL(is_error_page);
1283 int is_error_pfn(pfn_t pfn)
1285 return pfn == bad_pfn;
1287 EXPORT_SYMBOL_GPL(is_error_pfn);
1289 static inline unsigned long bad_hva(void)
1294 int kvm_is_error_hva(unsigned long addr)
1296 return addr == bad_hva();
1298 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1300 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
1304 for (i = 0; i < kvm->nmemslots; ++i) {
1305 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1307 if (gfn >= memslot->base_gfn
1308 && gfn < memslot->base_gfn + memslot->npages)
1313 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
1315 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1317 gfn = unalias_gfn(kvm, gfn);
1318 return gfn_to_memslot_unaliased(kvm, gfn);
1321 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1325 gfn = unalias_gfn(kvm, gfn);
1326 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1327 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1329 if (gfn >= memslot->base_gfn
1330 && gfn < memslot->base_gfn + memslot->npages)
1335 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1337 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1339 struct kvm_memory_slot *slot;
1341 gfn = unalias_gfn(kvm, gfn);
1342 slot = gfn_to_memslot_unaliased(kvm, gfn);
1345 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
1347 EXPORT_SYMBOL_GPL(gfn_to_hva);
1349 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1351 struct page *page[1];
1358 addr = gfn_to_hva(kvm, gfn);
1359 if (kvm_is_error_hva(addr)) {
1361 return page_to_pfn(bad_page);
1364 npages = get_user_pages_fast(addr, 1, 1, page);
1366 if (unlikely(npages != 1)) {
1367 struct vm_area_struct *vma;
1369 down_read(¤t->mm->mmap_sem);
1370 vma = find_vma(current->mm, addr);
1372 if (vma == NULL || addr < vma->vm_start ||
1373 !(vma->vm_flags & VM_PFNMAP)) {
1374 up_read(¤t->mm->mmap_sem);
1376 return page_to_pfn(bad_page);
1379 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1380 up_read(¤t->mm->mmap_sem);
1381 BUG_ON(!kvm_is_mmio_pfn(pfn));
1383 pfn = page_to_pfn(page[0]);
1388 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1390 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1394 pfn = gfn_to_pfn(kvm, gfn);
1395 if (!kvm_is_mmio_pfn(pfn))
1396 return pfn_to_page(pfn);
1398 WARN_ON(kvm_is_mmio_pfn(pfn));
1404 EXPORT_SYMBOL_GPL(gfn_to_page);
1406 void kvm_release_page_clean(struct page *page)
1408 kvm_release_pfn_clean(page_to_pfn(page));
1410 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1412 void kvm_release_pfn_clean(pfn_t pfn)
1414 if (!kvm_is_mmio_pfn(pfn))
1415 put_page(pfn_to_page(pfn));
1417 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1419 void kvm_release_page_dirty(struct page *page)
1421 kvm_release_pfn_dirty(page_to_pfn(page));
1423 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1425 void kvm_release_pfn_dirty(pfn_t pfn)
1427 kvm_set_pfn_dirty(pfn);
1428 kvm_release_pfn_clean(pfn);
1430 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1432 void kvm_set_page_dirty(struct page *page)
1434 kvm_set_pfn_dirty(page_to_pfn(page));
1436 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1438 void kvm_set_pfn_dirty(pfn_t pfn)
1440 if (!kvm_is_mmio_pfn(pfn)) {
1441 struct page *page = pfn_to_page(pfn);
1442 if (!PageReserved(page))
1446 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1448 void kvm_set_pfn_accessed(pfn_t pfn)
1450 if (!kvm_is_mmio_pfn(pfn))
1451 mark_page_accessed(pfn_to_page(pfn));
1453 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1455 void kvm_get_pfn(pfn_t pfn)
1457 if (!kvm_is_mmio_pfn(pfn))
1458 get_page(pfn_to_page(pfn));
1460 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1462 static int next_segment(unsigned long len, int offset)
1464 if (len > PAGE_SIZE - offset)
1465 return PAGE_SIZE - offset;
1470 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1476 addr = gfn_to_hva(kvm, gfn);
1477 if (kvm_is_error_hva(addr))
1479 r = copy_from_user(data, (void __user *)addr + offset, len);
1484 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1486 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1488 gfn_t gfn = gpa >> PAGE_SHIFT;
1490 int offset = offset_in_page(gpa);
1493 while ((seg = next_segment(len, offset)) != 0) {
1494 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1504 EXPORT_SYMBOL_GPL(kvm_read_guest);
1506 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1511 gfn_t gfn = gpa >> PAGE_SHIFT;
1512 int offset = offset_in_page(gpa);
1514 addr = gfn_to_hva(kvm, gfn);
1515 if (kvm_is_error_hva(addr))
1517 pagefault_disable();
1518 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1524 EXPORT_SYMBOL(kvm_read_guest_atomic);
1526 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1527 int offset, int len)
1532 addr = gfn_to_hva(kvm, gfn);
1533 if (kvm_is_error_hva(addr))
1535 r = copy_to_user((void __user *)addr + offset, data, len);
1538 mark_page_dirty(kvm, gfn);
1541 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1543 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1546 gfn_t gfn = gpa >> PAGE_SHIFT;
1548 int offset = offset_in_page(gpa);
1551 while ((seg = next_segment(len, offset)) != 0) {
1552 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1563 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1565 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1567 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1569 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1571 gfn_t gfn = gpa >> PAGE_SHIFT;
1573 int offset = offset_in_page(gpa);
1576 while ((seg = next_segment(len, offset)) != 0) {
1577 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1586 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1588 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1590 struct kvm_memory_slot *memslot;
1592 gfn = unalias_gfn(kvm, gfn);
1593 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1594 if (memslot && memslot->dirty_bitmap) {
1595 unsigned long rel_gfn = gfn - memslot->base_gfn;
1598 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1599 set_bit(rel_gfn, memslot->dirty_bitmap);
1604 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1606 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1611 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1613 if (kvm_cpu_has_interrupt(vcpu) ||
1614 kvm_arch_vcpu_runnable(vcpu)) {
1615 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1618 if (kvm_cpu_has_pending_timer(vcpu))
1620 if (signal_pending(current))
1628 finish_wait(&vcpu->wq, &wait);
1631 void kvm_resched(struct kvm_vcpu *vcpu)
1633 if (!need_resched())
1637 EXPORT_SYMBOL_GPL(kvm_resched);
1639 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1641 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1644 if (vmf->pgoff == 0)
1645 page = virt_to_page(vcpu->run);
1647 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1648 page = virt_to_page(vcpu->arch.pio_data);
1650 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1651 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1652 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1655 return VM_FAULT_SIGBUS;
1661 static struct vm_operations_struct kvm_vcpu_vm_ops = {
1662 .fault = kvm_vcpu_fault,
1665 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1667 vma->vm_ops = &kvm_vcpu_vm_ops;
1671 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1673 struct kvm_vcpu *vcpu = filp->private_data;
1675 kvm_put_kvm(vcpu->kvm);
1679 static struct file_operations kvm_vcpu_fops = {
1680 .release = kvm_vcpu_release,
1681 .unlocked_ioctl = kvm_vcpu_ioctl,
1682 .compat_ioctl = kvm_vcpu_ioctl,
1683 .mmap = kvm_vcpu_mmap,
1687 * Allocates an inode for the vcpu.
1689 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1691 int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1693 kvm_put_kvm(vcpu->kvm);
1698 * Creates some virtual cpus. Good luck creating more than one.
1700 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1703 struct kvm_vcpu *vcpu;
1708 vcpu = kvm_arch_vcpu_create(kvm, n);
1710 return PTR_ERR(vcpu);
1712 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1714 r = kvm_arch_vcpu_setup(vcpu);
1718 mutex_lock(&kvm->lock);
1719 if (kvm->vcpus[n]) {
1723 kvm->vcpus[n] = vcpu;
1724 mutex_unlock(&kvm->lock);
1726 /* Now it's all set up, let userspace reach it */
1728 r = create_vcpu_fd(vcpu);
1734 mutex_lock(&kvm->lock);
1735 kvm->vcpus[n] = NULL;
1737 mutex_unlock(&kvm->lock);
1738 kvm_arch_vcpu_destroy(vcpu);
1742 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1745 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1746 vcpu->sigset_active = 1;
1747 vcpu->sigset = *sigset;
1749 vcpu->sigset_active = 0;
1753 #ifdef __KVM_HAVE_MSIX
1754 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
1755 struct kvm_assigned_msix_nr *entry_nr)
1758 struct kvm_assigned_dev_kernel *adev;
1760 mutex_lock(&kvm->lock);
1762 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1763 entry_nr->assigned_dev_id);
1769 if (adev->entries_nr == 0) {
1770 adev->entries_nr = entry_nr->entry_nr;
1771 if (adev->entries_nr == 0 ||
1772 adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
1777 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
1780 if (!adev->host_msix_entries) {
1784 adev->guest_msix_entries = kzalloc(
1785 sizeof(struct kvm_guest_msix_entry) *
1786 entry_nr->entry_nr, GFP_KERNEL);
1787 if (!adev->guest_msix_entries) {
1788 kfree(adev->host_msix_entries);
1792 } else /* Not allowed set MSI-X number twice */
1795 mutex_unlock(&kvm->lock);
1799 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
1800 struct kvm_assigned_msix_entry *entry)
1803 struct kvm_assigned_dev_kernel *adev;
1805 mutex_lock(&kvm->lock);
1807 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1808 entry->assigned_dev_id);
1812 goto msix_entry_out;
1815 for (i = 0; i < adev->entries_nr; i++)
1816 if (adev->guest_msix_entries[i].vector == 0 ||
1817 adev->guest_msix_entries[i].entry == entry->entry) {
1818 adev->guest_msix_entries[i].entry = entry->entry;
1819 adev->guest_msix_entries[i].vector = entry->gsi;
1820 adev->host_msix_entries[i].entry = entry->entry;
1823 if (i == adev->entries_nr) {
1825 goto msix_entry_out;
1829 mutex_unlock(&kvm->lock);
1835 static long kvm_vcpu_ioctl(struct file *filp,
1836 unsigned int ioctl, unsigned long arg)
1838 struct kvm_vcpu *vcpu = filp->private_data;
1839 void __user *argp = (void __user *)arg;
1841 struct kvm_fpu *fpu = NULL;
1842 struct kvm_sregs *kvm_sregs = NULL;
1844 if (vcpu->kvm->mm != current->mm)
1851 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1853 case KVM_GET_REGS: {
1854 struct kvm_regs *kvm_regs;
1857 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1860 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1864 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1871 case KVM_SET_REGS: {
1872 struct kvm_regs *kvm_regs;
1875 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1879 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1881 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1889 case KVM_GET_SREGS: {
1890 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1894 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1898 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1903 case KVM_SET_SREGS: {
1904 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1909 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1911 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1917 case KVM_GET_MP_STATE: {
1918 struct kvm_mp_state mp_state;
1920 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1924 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1929 case KVM_SET_MP_STATE: {
1930 struct kvm_mp_state mp_state;
1933 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1935 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1941 case KVM_TRANSLATE: {
1942 struct kvm_translation tr;
1945 if (copy_from_user(&tr, argp, sizeof tr))
1947 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1951 if (copy_to_user(argp, &tr, sizeof tr))
1956 case KVM_SET_GUEST_DEBUG: {
1957 struct kvm_guest_debug dbg;
1960 if (copy_from_user(&dbg, argp, sizeof dbg))
1962 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1968 case KVM_SET_SIGNAL_MASK: {
1969 struct kvm_signal_mask __user *sigmask_arg = argp;
1970 struct kvm_signal_mask kvm_sigmask;
1971 sigset_t sigset, *p;
1976 if (copy_from_user(&kvm_sigmask, argp,
1977 sizeof kvm_sigmask))
1980 if (kvm_sigmask.len != sizeof sigset)
1983 if (copy_from_user(&sigset, sigmask_arg->sigset,
1988 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1992 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1996 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2000 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2006 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2011 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
2013 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2020 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2028 static long kvm_vm_ioctl(struct file *filp,
2029 unsigned int ioctl, unsigned long arg)
2031 struct kvm *kvm = filp->private_data;
2032 void __user *argp = (void __user *)arg;
2035 if (kvm->mm != current->mm)
2038 case KVM_CREATE_VCPU:
2039 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2043 case KVM_SET_USER_MEMORY_REGION: {
2044 struct kvm_userspace_memory_region kvm_userspace_mem;
2047 if (copy_from_user(&kvm_userspace_mem, argp,
2048 sizeof kvm_userspace_mem))
2051 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
2056 case KVM_GET_DIRTY_LOG: {
2057 struct kvm_dirty_log log;
2060 if (copy_from_user(&log, argp, sizeof log))
2062 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2067 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2068 case KVM_REGISTER_COALESCED_MMIO: {
2069 struct kvm_coalesced_mmio_zone zone;
2071 if (copy_from_user(&zone, argp, sizeof zone))
2074 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2080 case KVM_UNREGISTER_COALESCED_MMIO: {
2081 struct kvm_coalesced_mmio_zone zone;
2083 if (copy_from_user(&zone, argp, sizeof zone))
2086 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2093 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
2094 case KVM_ASSIGN_PCI_DEVICE: {
2095 struct kvm_assigned_pci_dev assigned_dev;
2098 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
2100 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
2105 case KVM_ASSIGN_IRQ: {
2109 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
2110 case KVM_ASSIGN_DEV_IRQ: {
2111 struct kvm_assigned_irq assigned_irq;
2114 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
2116 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
2121 case KVM_DEASSIGN_DEV_IRQ: {
2122 struct kvm_assigned_irq assigned_irq;
2125 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
2127 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
2134 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
2135 case KVM_DEASSIGN_PCI_DEVICE: {
2136 struct kvm_assigned_pci_dev assigned_dev;
2139 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
2141 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
2147 #ifdef KVM_CAP_IRQ_ROUTING
2148 case KVM_SET_GSI_ROUTING: {
2149 struct kvm_irq_routing routing;
2150 struct kvm_irq_routing __user *urouting;
2151 struct kvm_irq_routing_entry *entries;
2154 if (copy_from_user(&routing, argp, sizeof(routing)))
2157 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2162 entries = vmalloc(routing.nr * sizeof(*entries));
2167 if (copy_from_user(entries, urouting->entries,
2168 routing.nr * sizeof(*entries)))
2169 goto out_free_irq_routing;
2170 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2172 out_free_irq_routing:
2176 #ifdef __KVM_HAVE_MSIX
2177 case KVM_ASSIGN_SET_MSIX_NR: {
2178 struct kvm_assigned_msix_nr entry_nr;
2180 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
2182 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
2187 case KVM_ASSIGN_SET_MSIX_ENTRY: {
2188 struct kvm_assigned_msix_entry entry;
2190 if (copy_from_user(&entry, argp, sizeof entry))
2192 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
2198 #endif /* KVM_CAP_IRQ_ROUTING */
2200 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2206 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2208 struct page *page[1];
2211 gfn_t gfn = vmf->pgoff;
2212 struct kvm *kvm = vma->vm_file->private_data;
2214 addr = gfn_to_hva(kvm, gfn);
2215 if (kvm_is_error_hva(addr))
2216 return VM_FAULT_SIGBUS;
2218 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2220 if (unlikely(npages != 1))
2221 return VM_FAULT_SIGBUS;
2223 vmf->page = page[0];
2227 static struct vm_operations_struct kvm_vm_vm_ops = {
2228 .fault = kvm_vm_fault,
2231 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2233 vma->vm_ops = &kvm_vm_vm_ops;
2237 static struct file_operations kvm_vm_fops = {
2238 .release = kvm_vm_release,
2239 .unlocked_ioctl = kvm_vm_ioctl,
2240 .compat_ioctl = kvm_vm_ioctl,
2241 .mmap = kvm_vm_mmap,
2244 static int kvm_dev_ioctl_create_vm(void)
2249 kvm = kvm_create_vm();
2251 return PTR_ERR(kvm);
2252 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
2259 static long kvm_dev_ioctl_check_extension_generic(long arg)
2262 case KVM_CAP_USER_MEMORY:
2263 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2264 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2266 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2267 case KVM_CAP_IRQ_ROUTING:
2268 return KVM_MAX_IRQ_ROUTES;
2273 return kvm_dev_ioctl_check_extension(arg);
2276 static long kvm_dev_ioctl(struct file *filp,
2277 unsigned int ioctl, unsigned long arg)
2282 case KVM_GET_API_VERSION:
2286 r = KVM_API_VERSION;
2292 r = kvm_dev_ioctl_create_vm();
2294 case KVM_CHECK_EXTENSION:
2295 r = kvm_dev_ioctl_check_extension_generic(arg);
2297 case KVM_GET_VCPU_MMAP_SIZE:
2301 r = PAGE_SIZE; /* struct kvm_run */
2303 r += PAGE_SIZE; /* pio data page */
2305 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2306 r += PAGE_SIZE; /* coalesced mmio ring page */
2309 case KVM_TRACE_ENABLE:
2310 case KVM_TRACE_PAUSE:
2311 case KVM_TRACE_DISABLE:
2312 r = kvm_trace_ioctl(ioctl, arg);
2315 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2321 static struct file_operations kvm_chardev_ops = {
2322 .unlocked_ioctl = kvm_dev_ioctl,
2323 .compat_ioctl = kvm_dev_ioctl,
2326 static struct miscdevice kvm_dev = {
2332 static void hardware_enable(void *junk)
2334 int cpu = raw_smp_processor_id();
2336 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2338 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2339 kvm_arch_hardware_enable(NULL);
2342 static void hardware_disable(void *junk)
2344 int cpu = raw_smp_processor_id();
2346 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2348 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2349 kvm_arch_hardware_disable(NULL);
2352 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2357 val &= ~CPU_TASKS_FROZEN;
2360 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2362 hardware_disable(NULL);
2364 case CPU_UP_CANCELED:
2365 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2367 smp_call_function_single(cpu, hardware_disable, NULL, 1);
2370 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2372 smp_call_function_single(cpu, hardware_enable, NULL, 1);
2379 asmlinkage void kvm_handle_fault_on_reboot(void)
2382 /* spin while reset goes on */
2385 /* Fault while not rebooting. We want the trace. */
2388 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2390 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2393 if (val == SYS_RESTART) {
2395 * Some (well, at least mine) BIOSes hang on reboot if
2398 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2399 kvm_rebooting = true;
2400 on_each_cpu(hardware_disable, NULL, 1);
2405 static struct notifier_block kvm_reboot_notifier = {
2406 .notifier_call = kvm_reboot,
2410 void kvm_io_bus_init(struct kvm_io_bus *bus)
2412 memset(bus, 0, sizeof(*bus));
2415 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2419 for (i = 0; i < bus->dev_count; i++) {
2420 struct kvm_io_device *pos = bus->devs[i];
2422 kvm_iodevice_destructor(pos);
2426 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
2427 gpa_t addr, int len, int is_write)
2431 for (i = 0; i < bus->dev_count; i++) {
2432 struct kvm_io_device *pos = bus->devs[i];
2434 if (pos->in_range(pos, addr, len, is_write))
2441 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2443 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2445 bus->devs[bus->dev_count++] = dev;
2448 static struct notifier_block kvm_cpu_notifier = {
2449 .notifier_call = kvm_cpu_hotplug,
2450 .priority = 20, /* must be > scheduler priority */
2453 static int vm_stat_get(void *_offset, u64 *val)
2455 unsigned offset = (long)_offset;
2459 spin_lock(&kvm_lock);
2460 list_for_each_entry(kvm, &vm_list, vm_list)
2461 *val += *(u32 *)((void *)kvm + offset);
2462 spin_unlock(&kvm_lock);
2466 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2468 static int vcpu_stat_get(void *_offset, u64 *val)
2470 unsigned offset = (long)_offset;
2472 struct kvm_vcpu *vcpu;
2476 spin_lock(&kvm_lock);
2477 list_for_each_entry(kvm, &vm_list, vm_list)
2478 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2479 vcpu = kvm->vcpus[i];
2481 *val += *(u32 *)((void *)vcpu + offset);
2483 spin_unlock(&kvm_lock);
2487 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2489 static struct file_operations *stat_fops[] = {
2490 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2491 [KVM_STAT_VM] = &vm_stat_fops,
2494 static void kvm_init_debug(void)
2496 struct kvm_stats_debugfs_item *p;
2498 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2499 for (p = debugfs_entries; p->name; ++p)
2500 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2501 (void *)(long)p->offset,
2502 stat_fops[p->kind]);
2505 static void kvm_exit_debug(void)
2507 struct kvm_stats_debugfs_item *p;
2509 for (p = debugfs_entries; p->name; ++p)
2510 debugfs_remove(p->dentry);
2511 debugfs_remove(kvm_debugfs_dir);
2514 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2516 hardware_disable(NULL);
2520 static int kvm_resume(struct sys_device *dev)
2522 hardware_enable(NULL);
2526 static struct sysdev_class kvm_sysdev_class = {
2528 .suspend = kvm_suspend,
2529 .resume = kvm_resume,
2532 static struct sys_device kvm_sysdev = {
2534 .cls = &kvm_sysdev_class,
2537 struct page *bad_page;
2541 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2543 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2546 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2548 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2550 kvm_arch_vcpu_load(vcpu, cpu);
2553 static void kvm_sched_out(struct preempt_notifier *pn,
2554 struct task_struct *next)
2556 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2558 kvm_arch_vcpu_put(vcpu);
2561 int kvm_init(void *opaque, unsigned int vcpu_size,
2562 struct module *module)
2569 r = kvm_arch_init(opaque);
2573 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2575 if (bad_page == NULL) {
2580 bad_pfn = page_to_pfn(bad_page);
2582 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2586 cpumask_clear(cpus_hardware_enabled);
2588 r = kvm_arch_hardware_setup();
2592 for_each_online_cpu(cpu) {
2593 smp_call_function_single(cpu,
2594 kvm_arch_check_processor_compat,
2600 on_each_cpu(hardware_enable, NULL, 1);
2601 r = register_cpu_notifier(&kvm_cpu_notifier);
2604 register_reboot_notifier(&kvm_reboot_notifier);
2606 r = sysdev_class_register(&kvm_sysdev_class);
2610 r = sysdev_register(&kvm_sysdev);
2614 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2615 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2616 __alignof__(struct kvm_vcpu),
2618 if (!kvm_vcpu_cache) {
2623 kvm_chardev_ops.owner = module;
2624 kvm_vm_fops.owner = module;
2625 kvm_vcpu_fops.owner = module;
2627 r = misc_register(&kvm_dev);
2629 printk(KERN_ERR "kvm: misc device register failed\n");
2633 kvm_preempt_ops.sched_in = kvm_sched_in;
2634 kvm_preempt_ops.sched_out = kvm_sched_out;
2639 kmem_cache_destroy(kvm_vcpu_cache);
2641 sysdev_unregister(&kvm_sysdev);
2643 sysdev_class_unregister(&kvm_sysdev_class);
2645 unregister_reboot_notifier(&kvm_reboot_notifier);
2646 unregister_cpu_notifier(&kvm_cpu_notifier);
2648 on_each_cpu(hardware_disable, NULL, 1);
2650 kvm_arch_hardware_unsetup();
2652 free_cpumask_var(cpus_hardware_enabled);
2654 __free_page(bad_page);
2661 EXPORT_SYMBOL_GPL(kvm_init);
2665 kvm_trace_cleanup();
2666 misc_deregister(&kvm_dev);
2667 kmem_cache_destroy(kvm_vcpu_cache);
2668 sysdev_unregister(&kvm_sysdev);
2669 sysdev_class_unregister(&kvm_sysdev_class);
2670 unregister_reboot_notifier(&kvm_reboot_notifier);
2671 unregister_cpu_notifier(&kvm_cpu_notifier);
2672 on_each_cpu(hardware_disable, NULL, 1);
2673 kvm_arch_hardware_unsetup();
2676 free_cpumask_var(cpus_hardware_enabled);
2677 __free_page(bad_page);
2679 EXPORT_SYMBOL_GPL(kvm_exit);