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>
45 #include <asm/processor.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
50 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
51 #include "coalesced_mmio.h"
54 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
55 #include <linux/pci.h>
56 #include <linux/interrupt.h>
60 MODULE_AUTHOR("Qumranet");
61 MODULE_LICENSE("GPL");
63 static int msi2intx = 1;
64 module_param(msi2intx, bool, 0);
66 DEFINE_SPINLOCK(kvm_lock);
69 static cpumask_var_t cpus_hardware_enabled;
71 struct kmem_cache *kvm_vcpu_cache;
72 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
74 static __read_mostly struct preempt_ops kvm_preempt_ops;
76 struct dentry *kvm_debugfs_dir;
78 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
81 static bool kvm_rebooting;
83 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
84 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
87 struct list_head *ptr;
88 struct kvm_assigned_dev_kernel *match;
90 list_for_each(ptr, head) {
91 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
92 if (match->assigned_dev_id == assigned_dev_id)
98 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
99 *assigned_dev, int irq)
102 struct msix_entry *host_msix_entries;
104 host_msix_entries = assigned_dev->host_msix_entries;
107 for (i = 0; i < assigned_dev->entries_nr; i++)
108 if (irq == host_msix_entries[i].vector) {
113 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
120 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
122 struct kvm_assigned_dev_kernel *assigned_dev;
126 assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
128 kvm = assigned_dev->kvm;
130 /* This is taken to safely inject irq inside the guest. When
131 * the interrupt injection (or the ioapic code) uses a
132 * finer-grained lock, update this
134 mutex_lock(&kvm->lock);
135 if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_MSIX) {
136 struct kvm_guest_msix_entry *guest_entries =
137 assigned_dev->guest_msix_entries;
138 for (i = 0; i < assigned_dev->entries_nr; i++) {
139 if (!(guest_entries[i].flags &
140 KVM_ASSIGNED_MSIX_PENDING))
142 guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
143 kvm_set_irq(assigned_dev->kvm,
144 assigned_dev->irq_source_id,
145 guest_entries[i].vector, 1);
146 irq = assigned_dev->host_msix_entries[i].vector;
149 assigned_dev->host_irq_disabled = false;
152 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
153 assigned_dev->guest_irq, 1);
154 if (assigned_dev->irq_requested_type &
155 KVM_ASSIGNED_DEV_GUEST_MSI) {
156 enable_irq(assigned_dev->host_irq);
157 assigned_dev->host_irq_disabled = false;
161 mutex_unlock(&assigned_dev->kvm->lock);
164 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
166 struct kvm_assigned_dev_kernel *assigned_dev =
167 (struct kvm_assigned_dev_kernel *) dev_id;
169 if (assigned_dev->irq_requested_type == KVM_ASSIGNED_DEV_MSIX) {
170 int index = find_index_from_host_irq(assigned_dev, irq);
173 assigned_dev->guest_msix_entries[index].flags |=
174 KVM_ASSIGNED_MSIX_PENDING;
177 schedule_work(&assigned_dev->interrupt_work);
179 disable_irq_nosync(irq);
180 assigned_dev->host_irq_disabled = true;
185 /* Ack the irq line for an assigned device */
186 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
188 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 if (dev->host_irq_disabled) {
202 enable_irq(dev->host_irq);
203 dev->host_irq_disabled = false;
207 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
208 static void kvm_free_assigned_irq(struct kvm *kvm,
209 struct kvm_assigned_dev_kernel *assigned_dev)
211 if (!irqchip_in_kernel(kvm))
214 kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
216 if (assigned_dev->irq_source_id != -1)
217 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
218 assigned_dev->irq_source_id = -1;
220 if (!assigned_dev->irq_requested_type)
224 * In kvm_free_device_irq, cancel_work_sync return true if:
225 * 1. work is scheduled, and then cancelled.
226 * 2. work callback is executed.
228 * The first one ensured that the irq is disabled and no more events
229 * would happen. But for the second one, the irq may be enabled (e.g.
230 * for MSI). So we disable irq here to prevent further events.
232 * Notice this maybe result in nested disable if the interrupt type is
233 * INTx, but it's OK for we are going to free it.
235 * If this function is a part of VM destroy, please ensure that till
236 * now, the kvm state is still legal for probably we also have to wait
237 * interrupt_work done.
239 disable_irq_nosync(assigned_dev->host_irq);
240 cancel_work_sync(&assigned_dev->interrupt_work);
242 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
244 if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
245 pci_disable_msi(assigned_dev->dev);
247 assigned_dev->irq_requested_type = 0;
251 static void kvm_free_assigned_device(struct kvm *kvm,
252 struct kvm_assigned_dev_kernel
255 kvm_free_assigned_irq(kvm, assigned_dev);
257 pci_reset_function(assigned_dev->dev);
259 pci_release_regions(assigned_dev->dev);
260 pci_disable_device(assigned_dev->dev);
261 pci_dev_put(assigned_dev->dev);
263 list_del(&assigned_dev->list);
267 void kvm_free_all_assigned_devices(struct kvm *kvm)
269 struct list_head *ptr, *ptr2;
270 struct kvm_assigned_dev_kernel *assigned_dev;
272 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
273 assigned_dev = list_entry(ptr,
274 struct kvm_assigned_dev_kernel,
277 kvm_free_assigned_device(kvm, assigned_dev);
281 static int assigned_device_update_intx(struct kvm *kvm,
282 struct kvm_assigned_dev_kernel *adev,
283 struct kvm_assigned_irq *airq)
285 adev->guest_irq = airq->guest_irq;
286 adev->ack_notifier.gsi = airq->guest_irq;
288 if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_INTX)
291 if (irqchip_in_kernel(kvm)) {
293 (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)) {
294 free_irq(adev->host_irq, (void *)adev);
295 pci_disable_msi(adev->dev);
298 if (!capable(CAP_SYS_RAWIO))
302 adev->host_irq = airq->host_irq;
304 adev->host_irq = adev->dev->irq;
306 /* Even though this is PCI, we don't want to use shared
307 * interrupts. Sharing host devices with guest-assigned devices
308 * on the same interrupt line is not a happy situation: there
309 * are going to be long delays in accepting, acking, etc.
311 if (request_irq(adev->host_irq, kvm_assigned_dev_intr,
312 0, "kvm_assigned_intx_device", (void *)adev))
316 adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_INTX |
317 KVM_ASSIGNED_DEV_HOST_INTX;
322 static int assigned_device_update_msi(struct kvm *kvm,
323 struct kvm_assigned_dev_kernel *adev,
324 struct kvm_assigned_irq *airq)
328 adev->guest_irq = airq->guest_irq;
329 if (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
330 /* x86 don't care upper address of guest msi message addr */
331 adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
332 adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
333 adev->ack_notifier.gsi = -1;
334 } else if (msi2intx) {
335 adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
336 adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
337 adev->ack_notifier.gsi = airq->guest_irq;
340 * Guest require to disable device MSI, we disable MSI and
341 * re-enable INTx by default again. Notice it's only for
344 assigned_device_update_intx(kvm, adev, airq);
348 if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
351 if (irqchip_in_kernel(kvm)) {
353 if (adev->irq_requested_type &
354 KVM_ASSIGNED_DEV_HOST_INTX)
355 free_irq(adev->host_irq, (void *)adev);
357 r = pci_enable_msi(adev->dev);
362 adev->host_irq = adev->dev->irq;
363 if (request_irq(adev->host_irq, kvm_assigned_dev_intr, 0,
364 "kvm_assigned_msi_device", (void *)adev))
369 adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI;
371 adev->irq_requested_type |= KVM_ASSIGNED_DEV_HOST_MSI;
376 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
377 struct kvm_assigned_irq
381 struct kvm_assigned_dev_kernel *match;
382 u32 current_flags = 0, changed_flags;
384 mutex_lock(&kvm->lock);
386 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
387 assigned_irq->assigned_dev_id);
389 mutex_unlock(&kvm->lock);
393 if (!match->irq_requested_type) {
394 INIT_WORK(&match->interrupt_work,
395 kvm_assigned_dev_interrupt_work_handler);
396 if (irqchip_in_kernel(kvm)) {
397 /* Register ack nofitier */
398 match->ack_notifier.gsi = -1;
399 match->ack_notifier.irq_acked =
400 kvm_assigned_dev_ack_irq;
401 kvm_register_irq_ack_notifier(kvm,
402 &match->ack_notifier);
404 /* Request IRQ source ID */
405 r = kvm_request_irq_source_id(kvm);
409 match->irq_source_id = r;
412 /* Determine host device irq type, we can know the
413 * result from dev->msi_enabled */
415 pci_enable_msi(match->dev);
420 if ((match->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) &&
421 (match->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_MSI))
422 current_flags |= KVM_DEV_IRQ_ASSIGN_ENABLE_MSI;
424 changed_flags = assigned_irq->flags ^ current_flags;
426 if ((changed_flags & KVM_DEV_IRQ_ASSIGN_MSI_ACTION) ||
427 (msi2intx && match->dev->msi_enabled)) {
429 r = assigned_device_update_msi(kvm, match, assigned_irq);
431 printk(KERN_WARNING "kvm: failed to enable "
438 } else if (assigned_irq->host_irq == 0 && match->dev->irq == 0) {
439 /* Host device IRQ 0 means don't support INTx */
442 "kvm: wait device to enable MSI!\n");
446 "kvm: failed to enable MSI device!\n");
451 /* Non-sharing INTx mode */
452 r = assigned_device_update_intx(kvm, match, assigned_irq);
454 printk(KERN_WARNING "kvm: failed to enable "
460 mutex_unlock(&kvm->lock);
463 mutex_unlock(&kvm->lock);
464 kvm_free_assigned_device(kvm, match);
468 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
469 struct kvm_assigned_pci_dev *assigned_dev)
472 struct kvm_assigned_dev_kernel *match;
475 down_read(&kvm->slots_lock);
476 mutex_lock(&kvm->lock);
478 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
479 assigned_dev->assigned_dev_id);
481 /* device already assigned */
486 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
488 printk(KERN_INFO "%s: Couldn't allocate memory\n",
493 dev = pci_get_bus_and_slot(assigned_dev->busnr,
494 assigned_dev->devfn);
496 printk(KERN_INFO "%s: host device not found\n", __func__);
500 if (pci_enable_device(dev)) {
501 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
505 r = pci_request_regions(dev, "kvm_assigned_device");
507 printk(KERN_INFO "%s: Could not get access to device regions\n",
512 pci_reset_function(dev);
514 match->assigned_dev_id = assigned_dev->assigned_dev_id;
515 match->host_busnr = assigned_dev->busnr;
516 match->host_devfn = assigned_dev->devfn;
517 match->flags = assigned_dev->flags;
519 match->irq_source_id = -1;
522 list_add(&match->list, &kvm->arch.assigned_dev_head);
524 if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
525 if (!kvm->arch.iommu_domain) {
526 r = kvm_iommu_map_guest(kvm);
530 r = kvm_assign_device(kvm, match);
536 mutex_unlock(&kvm->lock);
537 up_read(&kvm->slots_lock);
540 list_del(&match->list);
541 pci_release_regions(dev);
543 pci_disable_device(dev);
548 mutex_unlock(&kvm->lock);
549 up_read(&kvm->slots_lock);
554 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
555 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
556 struct kvm_assigned_pci_dev *assigned_dev)
559 struct kvm_assigned_dev_kernel *match;
561 mutex_lock(&kvm->lock);
563 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
564 assigned_dev->assigned_dev_id);
566 printk(KERN_INFO "%s: device hasn't been assigned before, "
567 "so cannot be deassigned\n", __func__);
572 if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
573 kvm_deassign_device(kvm, match);
575 kvm_free_assigned_device(kvm, match);
578 mutex_unlock(&kvm->lock);
583 static inline int valid_vcpu(int n)
585 return likely(n >= 0 && n < KVM_MAX_VCPUS);
588 inline int kvm_is_mmio_pfn(pfn_t pfn)
590 if (pfn_valid(pfn)) {
591 struct page *page = compound_head(pfn_to_page(pfn));
592 return PageReserved(page);
599 * Switches to specified vcpu, until a matching vcpu_put()
601 void vcpu_load(struct kvm_vcpu *vcpu)
605 mutex_lock(&vcpu->mutex);
607 preempt_notifier_register(&vcpu->preempt_notifier);
608 kvm_arch_vcpu_load(vcpu, cpu);
612 void vcpu_put(struct kvm_vcpu *vcpu)
615 kvm_arch_vcpu_put(vcpu);
616 preempt_notifier_unregister(&vcpu->preempt_notifier);
618 mutex_unlock(&vcpu->mutex);
621 static void ack_flush(void *_completed)
625 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
630 struct kvm_vcpu *vcpu;
632 if (alloc_cpumask_var(&cpus, GFP_ATOMIC))
636 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
637 vcpu = kvm->vcpus[i];
640 if (test_and_set_bit(req, &vcpu->requests))
643 if (cpus != NULL && cpu != -1 && cpu != me)
644 cpumask_set_cpu(cpu, cpus);
646 if (unlikely(cpus == NULL))
647 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
648 else if (!cpumask_empty(cpus))
649 smp_call_function_many(cpus, ack_flush, NULL, 1);
653 free_cpumask_var(cpus);
657 void kvm_flush_remote_tlbs(struct kvm *kvm)
659 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
660 ++kvm->stat.remote_tlb_flush;
663 void kvm_reload_remote_mmus(struct kvm *kvm)
665 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
668 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
673 mutex_init(&vcpu->mutex);
677 init_waitqueue_head(&vcpu->wq);
679 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
684 vcpu->run = page_address(page);
686 r = kvm_arch_vcpu_init(vcpu);
692 free_page((unsigned long)vcpu->run);
696 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
698 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
700 kvm_arch_vcpu_uninit(vcpu);
701 free_page((unsigned long)vcpu->run);
703 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
705 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
706 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
708 return container_of(mn, struct kvm, mmu_notifier);
711 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
712 struct mm_struct *mm,
713 unsigned long address)
715 struct kvm *kvm = mmu_notifier_to_kvm(mn);
719 * When ->invalidate_page runs, the linux pte has been zapped
720 * already but the page is still allocated until
721 * ->invalidate_page returns. So if we increase the sequence
722 * here the kvm page fault will notice if the spte can't be
723 * established because the page is going to be freed. If
724 * instead the kvm page fault establishes the spte before
725 * ->invalidate_page runs, kvm_unmap_hva will release it
728 * The sequence increase only need to be seen at spin_unlock
729 * time, and not at spin_lock time.
731 * Increasing the sequence after the spin_unlock would be
732 * unsafe because the kvm page fault could then establish the
733 * pte after kvm_unmap_hva returned, without noticing the page
734 * is going to be freed.
736 spin_lock(&kvm->mmu_lock);
737 kvm->mmu_notifier_seq++;
738 need_tlb_flush = kvm_unmap_hva(kvm, address);
739 spin_unlock(&kvm->mmu_lock);
741 /* we've to flush the tlb before the pages can be freed */
743 kvm_flush_remote_tlbs(kvm);
747 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
748 struct mm_struct *mm,
752 struct kvm *kvm = mmu_notifier_to_kvm(mn);
753 int need_tlb_flush = 0;
755 spin_lock(&kvm->mmu_lock);
757 * The count increase must become visible at unlock time as no
758 * spte can be established without taking the mmu_lock and
759 * count is also read inside the mmu_lock critical section.
761 kvm->mmu_notifier_count++;
762 for (; start < end; start += PAGE_SIZE)
763 need_tlb_flush |= kvm_unmap_hva(kvm, start);
764 spin_unlock(&kvm->mmu_lock);
766 /* we've to flush the tlb before the pages can be freed */
768 kvm_flush_remote_tlbs(kvm);
771 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
772 struct mm_struct *mm,
776 struct kvm *kvm = mmu_notifier_to_kvm(mn);
778 spin_lock(&kvm->mmu_lock);
780 * This sequence increase will notify the kvm page fault that
781 * the page that is going to be mapped in the spte could have
784 kvm->mmu_notifier_seq++;
786 * The above sequence increase must be visible before the
787 * below count decrease but both values are read by the kvm
788 * page fault under mmu_lock spinlock so we don't need to add
789 * a smb_wmb() here in between the two.
791 kvm->mmu_notifier_count--;
792 spin_unlock(&kvm->mmu_lock);
794 BUG_ON(kvm->mmu_notifier_count < 0);
797 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
798 struct mm_struct *mm,
799 unsigned long address)
801 struct kvm *kvm = mmu_notifier_to_kvm(mn);
804 spin_lock(&kvm->mmu_lock);
805 young = kvm_age_hva(kvm, address);
806 spin_unlock(&kvm->mmu_lock);
809 kvm_flush_remote_tlbs(kvm);
814 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
815 struct mm_struct *mm)
817 struct kvm *kvm = mmu_notifier_to_kvm(mn);
818 kvm_arch_flush_shadow(kvm);
821 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
822 .invalidate_page = kvm_mmu_notifier_invalidate_page,
823 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
824 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
825 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
826 .release = kvm_mmu_notifier_release,
828 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
830 static struct kvm *kvm_create_vm(void)
832 struct kvm *kvm = kvm_arch_create_vm();
833 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
839 #ifdef CONFIG_HAVE_KVM_IRQCHIP
840 INIT_LIST_HEAD(&kvm->irq_routing);
841 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
844 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
845 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
848 return ERR_PTR(-ENOMEM);
850 kvm->coalesced_mmio_ring =
851 (struct kvm_coalesced_mmio_ring *)page_address(page);
854 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
857 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
858 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
860 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
869 kvm->mm = current->mm;
870 atomic_inc(&kvm->mm->mm_count);
871 spin_lock_init(&kvm->mmu_lock);
872 kvm_io_bus_init(&kvm->pio_bus);
873 mutex_init(&kvm->lock);
874 kvm_io_bus_init(&kvm->mmio_bus);
875 init_rwsem(&kvm->slots_lock);
876 atomic_set(&kvm->users_count, 1);
877 spin_lock(&kvm_lock);
878 list_add(&kvm->vm_list, &vm_list);
879 spin_unlock(&kvm_lock);
880 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
881 kvm_coalesced_mmio_init(kvm);
888 * Free any memory in @free but not in @dont.
890 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
891 struct kvm_memory_slot *dont)
893 if (!dont || free->rmap != dont->rmap)
896 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
897 vfree(free->dirty_bitmap);
899 if (!dont || free->lpage_info != dont->lpage_info)
900 vfree(free->lpage_info);
903 free->dirty_bitmap = NULL;
905 free->lpage_info = NULL;
908 void kvm_free_physmem(struct kvm *kvm)
912 for (i = 0; i < kvm->nmemslots; ++i)
913 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
916 static void kvm_destroy_vm(struct kvm *kvm)
918 struct mm_struct *mm = kvm->mm;
920 kvm_arch_sync_events(kvm);
921 spin_lock(&kvm_lock);
922 list_del(&kvm->vm_list);
923 spin_unlock(&kvm_lock);
924 kvm_free_irq_routing(kvm);
925 kvm_io_bus_destroy(&kvm->pio_bus);
926 kvm_io_bus_destroy(&kvm->mmio_bus);
927 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
928 if (kvm->coalesced_mmio_ring != NULL)
929 free_page((unsigned long)kvm->coalesced_mmio_ring);
931 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
932 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
934 kvm_arch_destroy_vm(kvm);
938 void kvm_get_kvm(struct kvm *kvm)
940 atomic_inc(&kvm->users_count);
942 EXPORT_SYMBOL_GPL(kvm_get_kvm);
944 void kvm_put_kvm(struct kvm *kvm)
946 if (atomic_dec_and_test(&kvm->users_count))
949 EXPORT_SYMBOL_GPL(kvm_put_kvm);
952 static int kvm_vm_release(struct inode *inode, struct file *filp)
954 struct kvm *kvm = filp->private_data;
961 * Allocate some memory and give it an address in the guest physical address
964 * Discontiguous memory is allowed, mostly for framebuffers.
966 * Must be called holding mmap_sem for write.
968 int __kvm_set_memory_region(struct kvm *kvm,
969 struct kvm_userspace_memory_region *mem,
974 unsigned long npages;
977 struct kvm_memory_slot *memslot;
978 struct kvm_memory_slot old, new;
981 /* General sanity checks */
982 if (mem->memory_size & (PAGE_SIZE - 1))
984 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
986 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
988 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
990 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
993 memslot = &kvm->memslots[mem->slot];
994 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
995 npages = mem->memory_size >> PAGE_SHIFT;
998 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
1000 new = old = *memslot;
1002 new.base_gfn = base_gfn;
1003 new.npages = npages;
1004 new.flags = mem->flags;
1006 /* Disallow changing a memory slot's size. */
1008 if (npages && old.npages && npages != old.npages)
1011 /* Check for overlaps */
1013 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1014 struct kvm_memory_slot *s = &kvm->memslots[i];
1016 if (s == memslot || !s->npages)
1018 if (!((base_gfn + npages <= s->base_gfn) ||
1019 (base_gfn >= s->base_gfn + s->npages)))
1023 /* Free page dirty bitmap if unneeded */
1024 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
1025 new.dirty_bitmap = NULL;
1029 /* Allocate if a slot is being created */
1031 if (npages && !new.rmap) {
1032 new.rmap = vmalloc(npages * sizeof(struct page *));
1037 memset(new.rmap, 0, npages * sizeof(*new.rmap));
1039 new.user_alloc = user_alloc;
1041 * hva_to_rmmap() serialzies with the mmu_lock and to be
1042 * safe it has to ignore memslots with !user_alloc &&
1046 new.userspace_addr = mem->userspace_addr;
1048 new.userspace_addr = 0;
1050 if (npages && !new.lpage_info) {
1051 largepages = 1 + (base_gfn + npages - 1) / KVM_PAGES_PER_HPAGE;
1052 largepages -= base_gfn / KVM_PAGES_PER_HPAGE;
1054 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
1056 if (!new.lpage_info)
1059 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
1061 if (base_gfn % KVM_PAGES_PER_HPAGE)
1062 new.lpage_info[0].write_count = 1;
1063 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
1064 new.lpage_info[largepages-1].write_count = 1;
1067 /* Allocate page dirty bitmap if needed */
1068 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1069 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
1071 new.dirty_bitmap = vmalloc(dirty_bytes);
1072 if (!new.dirty_bitmap)
1074 memset(new.dirty_bitmap, 0, dirty_bytes);
1076 #endif /* not defined CONFIG_S390 */
1079 kvm_arch_flush_shadow(kvm);
1081 spin_lock(&kvm->mmu_lock);
1082 if (mem->slot >= kvm->nmemslots)
1083 kvm->nmemslots = mem->slot + 1;
1086 spin_unlock(&kvm->mmu_lock);
1088 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
1090 spin_lock(&kvm->mmu_lock);
1092 spin_unlock(&kvm->mmu_lock);
1096 kvm_free_physmem_slot(&old, npages ? &new : NULL);
1097 /* Slot deletion case: we have to update the current slot */
1101 /* map the pages in iommu page table */
1102 r = kvm_iommu_map_pages(kvm, base_gfn, npages);
1109 kvm_free_physmem_slot(&new, &old);
1114 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1116 int kvm_set_memory_region(struct kvm *kvm,
1117 struct kvm_userspace_memory_region *mem,
1122 down_write(&kvm->slots_lock);
1123 r = __kvm_set_memory_region(kvm, mem, user_alloc);
1124 up_write(&kvm->slots_lock);
1127 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1129 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1131 kvm_userspace_memory_region *mem,
1134 if (mem->slot >= KVM_MEMORY_SLOTS)
1136 return kvm_set_memory_region(kvm, mem, user_alloc);
1139 int kvm_get_dirty_log(struct kvm *kvm,
1140 struct kvm_dirty_log *log, int *is_dirty)
1142 struct kvm_memory_slot *memslot;
1145 unsigned long any = 0;
1148 if (log->slot >= KVM_MEMORY_SLOTS)
1151 memslot = &kvm->memslots[log->slot];
1153 if (!memslot->dirty_bitmap)
1156 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1158 for (i = 0; !any && i < n/sizeof(long); ++i)
1159 any = memslot->dirty_bitmap[i];
1162 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1173 int is_error_page(struct page *page)
1175 return page == bad_page;
1177 EXPORT_SYMBOL_GPL(is_error_page);
1179 int is_error_pfn(pfn_t pfn)
1181 return pfn == bad_pfn;
1183 EXPORT_SYMBOL_GPL(is_error_pfn);
1185 static inline unsigned long bad_hva(void)
1190 int kvm_is_error_hva(unsigned long addr)
1192 return addr == bad_hva();
1194 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1196 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
1200 for (i = 0; i < kvm->nmemslots; ++i) {
1201 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1203 if (gfn >= memslot->base_gfn
1204 && gfn < memslot->base_gfn + memslot->npages)
1209 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
1211 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1213 gfn = unalias_gfn(kvm, gfn);
1214 return gfn_to_memslot_unaliased(kvm, gfn);
1217 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1221 gfn = unalias_gfn(kvm, gfn);
1222 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1223 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1225 if (gfn >= memslot->base_gfn
1226 && gfn < memslot->base_gfn + memslot->npages)
1231 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1233 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1235 struct kvm_memory_slot *slot;
1237 gfn = unalias_gfn(kvm, gfn);
1238 slot = gfn_to_memslot_unaliased(kvm, gfn);
1241 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
1243 EXPORT_SYMBOL_GPL(gfn_to_hva);
1245 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1247 struct page *page[1];
1254 addr = gfn_to_hva(kvm, gfn);
1255 if (kvm_is_error_hva(addr)) {
1257 return page_to_pfn(bad_page);
1260 npages = get_user_pages_fast(addr, 1, 1, page);
1262 if (unlikely(npages != 1)) {
1263 struct vm_area_struct *vma;
1265 down_read(¤t->mm->mmap_sem);
1266 vma = find_vma(current->mm, addr);
1268 if (vma == NULL || addr < vma->vm_start ||
1269 !(vma->vm_flags & VM_PFNMAP)) {
1270 up_read(¤t->mm->mmap_sem);
1272 return page_to_pfn(bad_page);
1275 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1276 up_read(¤t->mm->mmap_sem);
1277 BUG_ON(!kvm_is_mmio_pfn(pfn));
1279 pfn = page_to_pfn(page[0]);
1284 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1286 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1290 pfn = gfn_to_pfn(kvm, gfn);
1291 if (!kvm_is_mmio_pfn(pfn))
1292 return pfn_to_page(pfn);
1294 WARN_ON(kvm_is_mmio_pfn(pfn));
1300 EXPORT_SYMBOL_GPL(gfn_to_page);
1302 void kvm_release_page_clean(struct page *page)
1304 kvm_release_pfn_clean(page_to_pfn(page));
1306 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1308 void kvm_release_pfn_clean(pfn_t pfn)
1310 if (!kvm_is_mmio_pfn(pfn))
1311 put_page(pfn_to_page(pfn));
1313 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1315 void kvm_release_page_dirty(struct page *page)
1317 kvm_release_pfn_dirty(page_to_pfn(page));
1319 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1321 void kvm_release_pfn_dirty(pfn_t pfn)
1323 kvm_set_pfn_dirty(pfn);
1324 kvm_release_pfn_clean(pfn);
1326 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1328 void kvm_set_page_dirty(struct page *page)
1330 kvm_set_pfn_dirty(page_to_pfn(page));
1332 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1334 void kvm_set_pfn_dirty(pfn_t pfn)
1336 if (!kvm_is_mmio_pfn(pfn)) {
1337 struct page *page = pfn_to_page(pfn);
1338 if (!PageReserved(page))
1342 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1344 void kvm_set_pfn_accessed(pfn_t pfn)
1346 if (!kvm_is_mmio_pfn(pfn))
1347 mark_page_accessed(pfn_to_page(pfn));
1349 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1351 void kvm_get_pfn(pfn_t pfn)
1353 if (!kvm_is_mmio_pfn(pfn))
1354 get_page(pfn_to_page(pfn));
1356 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1358 static int next_segment(unsigned long len, int offset)
1360 if (len > PAGE_SIZE - offset)
1361 return PAGE_SIZE - offset;
1366 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1372 addr = gfn_to_hva(kvm, gfn);
1373 if (kvm_is_error_hva(addr))
1375 r = copy_from_user(data, (void __user *)addr + offset, len);
1380 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1382 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1384 gfn_t gfn = gpa >> PAGE_SHIFT;
1386 int offset = offset_in_page(gpa);
1389 while ((seg = next_segment(len, offset)) != 0) {
1390 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1400 EXPORT_SYMBOL_GPL(kvm_read_guest);
1402 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1407 gfn_t gfn = gpa >> PAGE_SHIFT;
1408 int offset = offset_in_page(gpa);
1410 addr = gfn_to_hva(kvm, gfn);
1411 if (kvm_is_error_hva(addr))
1413 pagefault_disable();
1414 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1420 EXPORT_SYMBOL(kvm_read_guest_atomic);
1422 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1423 int offset, int len)
1428 addr = gfn_to_hva(kvm, gfn);
1429 if (kvm_is_error_hva(addr))
1431 r = copy_to_user((void __user *)addr + offset, data, len);
1434 mark_page_dirty(kvm, gfn);
1437 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1439 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1442 gfn_t gfn = gpa >> PAGE_SHIFT;
1444 int offset = offset_in_page(gpa);
1447 while ((seg = next_segment(len, offset)) != 0) {
1448 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1459 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1461 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1463 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1465 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1467 gfn_t gfn = gpa >> PAGE_SHIFT;
1469 int offset = offset_in_page(gpa);
1472 while ((seg = next_segment(len, offset)) != 0) {
1473 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1482 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1484 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1486 struct kvm_memory_slot *memslot;
1488 gfn = unalias_gfn(kvm, gfn);
1489 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1490 if (memslot && memslot->dirty_bitmap) {
1491 unsigned long rel_gfn = gfn - memslot->base_gfn;
1494 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1495 set_bit(rel_gfn, memslot->dirty_bitmap);
1500 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1502 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1507 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1509 if (kvm_cpu_has_interrupt(vcpu) ||
1510 kvm_cpu_has_pending_timer(vcpu) ||
1511 kvm_arch_vcpu_runnable(vcpu)) {
1512 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1515 if (signal_pending(current))
1523 finish_wait(&vcpu->wq, &wait);
1526 void kvm_resched(struct kvm_vcpu *vcpu)
1528 if (!need_resched())
1532 EXPORT_SYMBOL_GPL(kvm_resched);
1534 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1536 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1539 if (vmf->pgoff == 0)
1540 page = virt_to_page(vcpu->run);
1542 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1543 page = virt_to_page(vcpu->arch.pio_data);
1545 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1546 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1547 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1550 return VM_FAULT_SIGBUS;
1556 static struct vm_operations_struct kvm_vcpu_vm_ops = {
1557 .fault = kvm_vcpu_fault,
1560 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1562 vma->vm_ops = &kvm_vcpu_vm_ops;
1566 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1568 struct kvm_vcpu *vcpu = filp->private_data;
1570 kvm_put_kvm(vcpu->kvm);
1574 static struct file_operations kvm_vcpu_fops = {
1575 .release = kvm_vcpu_release,
1576 .unlocked_ioctl = kvm_vcpu_ioctl,
1577 .compat_ioctl = kvm_vcpu_ioctl,
1578 .mmap = kvm_vcpu_mmap,
1582 * Allocates an inode for the vcpu.
1584 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1586 int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1588 kvm_put_kvm(vcpu->kvm);
1593 * Creates some virtual cpus. Good luck creating more than one.
1595 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1598 struct kvm_vcpu *vcpu;
1603 vcpu = kvm_arch_vcpu_create(kvm, n);
1605 return PTR_ERR(vcpu);
1607 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1609 r = kvm_arch_vcpu_setup(vcpu);
1613 mutex_lock(&kvm->lock);
1614 if (kvm->vcpus[n]) {
1618 kvm->vcpus[n] = vcpu;
1619 mutex_unlock(&kvm->lock);
1621 /* Now it's all set up, let userspace reach it */
1623 r = create_vcpu_fd(vcpu);
1629 mutex_lock(&kvm->lock);
1630 kvm->vcpus[n] = NULL;
1632 mutex_unlock(&kvm->lock);
1633 kvm_arch_vcpu_destroy(vcpu);
1637 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1640 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1641 vcpu->sigset_active = 1;
1642 vcpu->sigset = *sigset;
1644 vcpu->sigset_active = 0;
1648 #ifdef __KVM_HAVE_MSIX
1649 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
1650 struct kvm_assigned_msix_nr *entry_nr)
1653 struct kvm_assigned_dev_kernel *adev;
1655 mutex_lock(&kvm->lock);
1657 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1658 entry_nr->assigned_dev_id);
1664 if (adev->entries_nr == 0) {
1665 adev->entries_nr = entry_nr->entry_nr;
1666 if (adev->entries_nr == 0 ||
1667 adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
1672 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
1675 if (!adev->host_msix_entries) {
1679 adev->guest_msix_entries = kzalloc(
1680 sizeof(struct kvm_guest_msix_entry) *
1681 entry_nr->entry_nr, GFP_KERNEL);
1682 if (!adev->guest_msix_entries) {
1683 kfree(adev->host_msix_entries);
1687 } else /* Not allowed set MSI-X number twice */
1690 mutex_unlock(&kvm->lock);
1694 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
1695 struct kvm_assigned_msix_entry *entry)
1698 struct kvm_assigned_dev_kernel *adev;
1700 mutex_lock(&kvm->lock);
1702 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1703 entry->assigned_dev_id);
1707 goto msix_entry_out;
1710 for (i = 0; i < adev->entries_nr; i++)
1711 if (adev->guest_msix_entries[i].vector == 0 ||
1712 adev->guest_msix_entries[i].entry == entry->entry) {
1713 adev->guest_msix_entries[i].entry = entry->entry;
1714 adev->guest_msix_entries[i].vector = entry->gsi;
1715 adev->host_msix_entries[i].entry = entry->entry;
1718 if (i == adev->entries_nr) {
1720 goto msix_entry_out;
1724 mutex_unlock(&kvm->lock);
1730 static long kvm_vcpu_ioctl(struct file *filp,
1731 unsigned int ioctl, unsigned long arg)
1733 struct kvm_vcpu *vcpu = filp->private_data;
1734 void __user *argp = (void __user *)arg;
1736 struct kvm_fpu *fpu = NULL;
1737 struct kvm_sregs *kvm_sregs = NULL;
1739 if (vcpu->kvm->mm != current->mm)
1746 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1748 case KVM_GET_REGS: {
1749 struct kvm_regs *kvm_regs;
1752 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1755 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1759 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1766 case KVM_SET_REGS: {
1767 struct kvm_regs *kvm_regs;
1770 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1774 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1776 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1784 case KVM_GET_SREGS: {
1785 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1789 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1793 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1798 case KVM_SET_SREGS: {
1799 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1804 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1806 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1812 case KVM_GET_MP_STATE: {
1813 struct kvm_mp_state mp_state;
1815 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1819 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1824 case KVM_SET_MP_STATE: {
1825 struct kvm_mp_state mp_state;
1828 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1830 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1836 case KVM_TRANSLATE: {
1837 struct kvm_translation tr;
1840 if (copy_from_user(&tr, argp, sizeof tr))
1842 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1846 if (copy_to_user(argp, &tr, sizeof tr))
1851 case KVM_SET_GUEST_DEBUG: {
1852 struct kvm_guest_debug dbg;
1855 if (copy_from_user(&dbg, argp, sizeof dbg))
1857 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1863 case KVM_SET_SIGNAL_MASK: {
1864 struct kvm_signal_mask __user *sigmask_arg = argp;
1865 struct kvm_signal_mask kvm_sigmask;
1866 sigset_t sigset, *p;
1871 if (copy_from_user(&kvm_sigmask, argp,
1872 sizeof kvm_sigmask))
1875 if (kvm_sigmask.len != sizeof sigset)
1878 if (copy_from_user(&sigset, sigmask_arg->sigset,
1883 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1887 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1891 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1895 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1901 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1906 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1908 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1915 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1923 static long kvm_vm_ioctl(struct file *filp,
1924 unsigned int ioctl, unsigned long arg)
1926 struct kvm *kvm = filp->private_data;
1927 void __user *argp = (void __user *)arg;
1930 if (kvm->mm != current->mm)
1933 case KVM_CREATE_VCPU:
1934 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1938 case KVM_SET_USER_MEMORY_REGION: {
1939 struct kvm_userspace_memory_region kvm_userspace_mem;
1942 if (copy_from_user(&kvm_userspace_mem, argp,
1943 sizeof kvm_userspace_mem))
1946 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1951 case KVM_GET_DIRTY_LOG: {
1952 struct kvm_dirty_log log;
1955 if (copy_from_user(&log, argp, sizeof log))
1957 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1962 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1963 case KVM_REGISTER_COALESCED_MMIO: {
1964 struct kvm_coalesced_mmio_zone zone;
1966 if (copy_from_user(&zone, argp, sizeof zone))
1969 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1975 case KVM_UNREGISTER_COALESCED_MMIO: {
1976 struct kvm_coalesced_mmio_zone zone;
1978 if (copy_from_user(&zone, argp, sizeof zone))
1981 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1988 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
1989 case KVM_ASSIGN_PCI_DEVICE: {
1990 struct kvm_assigned_pci_dev assigned_dev;
1993 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1995 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
2000 case KVM_ASSIGN_IRQ: {
2001 struct kvm_assigned_irq assigned_irq;
2004 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
2006 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
2012 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
2013 case KVM_DEASSIGN_PCI_DEVICE: {
2014 struct kvm_assigned_pci_dev assigned_dev;
2017 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
2019 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
2025 #ifdef KVM_CAP_IRQ_ROUTING
2026 case KVM_SET_GSI_ROUTING: {
2027 struct kvm_irq_routing routing;
2028 struct kvm_irq_routing __user *urouting;
2029 struct kvm_irq_routing_entry *entries;
2032 if (copy_from_user(&routing, argp, sizeof(routing)))
2035 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
2040 entries = vmalloc(routing.nr * sizeof(*entries));
2045 if (copy_from_user(entries, urouting->entries,
2046 routing.nr * sizeof(*entries)))
2047 goto out_free_irq_routing;
2048 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2050 out_free_irq_routing:
2054 #ifdef __KVM_HAVE_MSIX
2055 case KVM_ASSIGN_SET_MSIX_NR: {
2056 struct kvm_assigned_msix_nr entry_nr;
2058 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
2060 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
2065 case KVM_ASSIGN_SET_MSIX_ENTRY: {
2066 struct kvm_assigned_msix_entry entry;
2068 if (copy_from_user(&entry, argp, sizeof entry))
2070 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
2076 #endif /* KVM_CAP_IRQ_ROUTING */
2078 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2084 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2086 struct page *page[1];
2089 gfn_t gfn = vmf->pgoff;
2090 struct kvm *kvm = vma->vm_file->private_data;
2092 addr = gfn_to_hva(kvm, gfn);
2093 if (kvm_is_error_hva(addr))
2094 return VM_FAULT_SIGBUS;
2096 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2098 if (unlikely(npages != 1))
2099 return VM_FAULT_SIGBUS;
2101 vmf->page = page[0];
2105 static struct vm_operations_struct kvm_vm_vm_ops = {
2106 .fault = kvm_vm_fault,
2109 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2111 vma->vm_ops = &kvm_vm_vm_ops;
2115 static struct file_operations kvm_vm_fops = {
2116 .release = kvm_vm_release,
2117 .unlocked_ioctl = kvm_vm_ioctl,
2118 .compat_ioctl = kvm_vm_ioctl,
2119 .mmap = kvm_vm_mmap,
2122 static int kvm_dev_ioctl_create_vm(void)
2127 kvm = kvm_create_vm();
2129 return PTR_ERR(kvm);
2130 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
2137 static long kvm_dev_ioctl_check_extension_generic(long arg)
2140 case KVM_CAP_USER_MEMORY:
2141 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2142 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2144 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2145 case KVM_CAP_IRQ_ROUTING:
2146 return KVM_MAX_IRQ_ROUTES;
2151 return kvm_dev_ioctl_check_extension(arg);
2154 static long kvm_dev_ioctl(struct file *filp,
2155 unsigned int ioctl, unsigned long arg)
2160 case KVM_GET_API_VERSION:
2164 r = KVM_API_VERSION;
2170 r = kvm_dev_ioctl_create_vm();
2172 case KVM_CHECK_EXTENSION:
2173 r = kvm_dev_ioctl_check_extension_generic(arg);
2175 case KVM_GET_VCPU_MMAP_SIZE:
2179 r = PAGE_SIZE; /* struct kvm_run */
2181 r += PAGE_SIZE; /* pio data page */
2183 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2184 r += PAGE_SIZE; /* coalesced mmio ring page */
2187 case KVM_TRACE_ENABLE:
2188 case KVM_TRACE_PAUSE:
2189 case KVM_TRACE_DISABLE:
2190 r = kvm_trace_ioctl(ioctl, arg);
2193 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2199 static struct file_operations kvm_chardev_ops = {
2200 .unlocked_ioctl = kvm_dev_ioctl,
2201 .compat_ioctl = kvm_dev_ioctl,
2204 static struct miscdevice kvm_dev = {
2210 static void hardware_enable(void *junk)
2212 int cpu = raw_smp_processor_id();
2214 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2216 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2217 kvm_arch_hardware_enable(NULL);
2220 static void hardware_disable(void *junk)
2222 int cpu = raw_smp_processor_id();
2224 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2226 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2227 kvm_arch_hardware_disable(NULL);
2230 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2235 val &= ~CPU_TASKS_FROZEN;
2238 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2240 hardware_disable(NULL);
2242 case CPU_UP_CANCELED:
2243 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2245 smp_call_function_single(cpu, hardware_disable, NULL, 1);
2248 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2250 smp_call_function_single(cpu, hardware_enable, NULL, 1);
2257 asmlinkage void kvm_handle_fault_on_reboot(void)
2260 /* spin while reset goes on */
2263 /* Fault while not rebooting. We want the trace. */
2266 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2268 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2271 if (val == SYS_RESTART) {
2273 * Some (well, at least mine) BIOSes hang on reboot if
2276 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2277 kvm_rebooting = true;
2278 on_each_cpu(hardware_disable, NULL, 1);
2283 static struct notifier_block kvm_reboot_notifier = {
2284 .notifier_call = kvm_reboot,
2288 void kvm_io_bus_init(struct kvm_io_bus *bus)
2290 memset(bus, 0, sizeof(*bus));
2293 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2297 for (i = 0; i < bus->dev_count; i++) {
2298 struct kvm_io_device *pos = bus->devs[i];
2300 kvm_iodevice_destructor(pos);
2304 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
2305 gpa_t addr, int len, int is_write)
2309 for (i = 0; i < bus->dev_count; i++) {
2310 struct kvm_io_device *pos = bus->devs[i];
2312 if (pos->in_range(pos, addr, len, is_write))
2319 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2321 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2323 bus->devs[bus->dev_count++] = dev;
2326 static struct notifier_block kvm_cpu_notifier = {
2327 .notifier_call = kvm_cpu_hotplug,
2328 .priority = 20, /* must be > scheduler priority */
2331 static int vm_stat_get(void *_offset, u64 *val)
2333 unsigned offset = (long)_offset;
2337 spin_lock(&kvm_lock);
2338 list_for_each_entry(kvm, &vm_list, vm_list)
2339 *val += *(u32 *)((void *)kvm + offset);
2340 spin_unlock(&kvm_lock);
2344 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2346 static int vcpu_stat_get(void *_offset, u64 *val)
2348 unsigned offset = (long)_offset;
2350 struct kvm_vcpu *vcpu;
2354 spin_lock(&kvm_lock);
2355 list_for_each_entry(kvm, &vm_list, vm_list)
2356 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2357 vcpu = kvm->vcpus[i];
2359 *val += *(u32 *)((void *)vcpu + offset);
2361 spin_unlock(&kvm_lock);
2365 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2367 static struct file_operations *stat_fops[] = {
2368 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2369 [KVM_STAT_VM] = &vm_stat_fops,
2372 static void kvm_init_debug(void)
2374 struct kvm_stats_debugfs_item *p;
2376 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2377 for (p = debugfs_entries; p->name; ++p)
2378 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2379 (void *)(long)p->offset,
2380 stat_fops[p->kind]);
2383 static void kvm_exit_debug(void)
2385 struct kvm_stats_debugfs_item *p;
2387 for (p = debugfs_entries; p->name; ++p)
2388 debugfs_remove(p->dentry);
2389 debugfs_remove(kvm_debugfs_dir);
2392 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2394 hardware_disable(NULL);
2398 static int kvm_resume(struct sys_device *dev)
2400 hardware_enable(NULL);
2404 static struct sysdev_class kvm_sysdev_class = {
2406 .suspend = kvm_suspend,
2407 .resume = kvm_resume,
2410 static struct sys_device kvm_sysdev = {
2412 .cls = &kvm_sysdev_class,
2415 struct page *bad_page;
2419 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2421 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2424 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2426 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2428 kvm_arch_vcpu_load(vcpu, cpu);
2431 static void kvm_sched_out(struct preempt_notifier *pn,
2432 struct task_struct *next)
2434 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2436 kvm_arch_vcpu_put(vcpu);
2439 int kvm_init(void *opaque, unsigned int vcpu_size,
2440 struct module *module)
2447 r = kvm_arch_init(opaque);
2451 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2453 if (bad_page == NULL) {
2458 bad_pfn = page_to_pfn(bad_page);
2460 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2464 cpumask_clear(cpus_hardware_enabled);
2466 r = kvm_arch_hardware_setup();
2470 for_each_online_cpu(cpu) {
2471 smp_call_function_single(cpu,
2472 kvm_arch_check_processor_compat,
2478 on_each_cpu(hardware_enable, NULL, 1);
2479 r = register_cpu_notifier(&kvm_cpu_notifier);
2482 register_reboot_notifier(&kvm_reboot_notifier);
2484 r = sysdev_class_register(&kvm_sysdev_class);
2488 r = sysdev_register(&kvm_sysdev);
2492 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2493 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2494 __alignof__(struct kvm_vcpu),
2496 if (!kvm_vcpu_cache) {
2501 kvm_chardev_ops.owner = module;
2502 kvm_vm_fops.owner = module;
2503 kvm_vcpu_fops.owner = module;
2505 r = misc_register(&kvm_dev);
2507 printk(KERN_ERR "kvm: misc device register failed\n");
2511 kvm_preempt_ops.sched_in = kvm_sched_in;
2512 kvm_preempt_ops.sched_out = kvm_sched_out;
2520 kmem_cache_destroy(kvm_vcpu_cache);
2522 sysdev_unregister(&kvm_sysdev);
2524 sysdev_class_unregister(&kvm_sysdev_class);
2526 unregister_reboot_notifier(&kvm_reboot_notifier);
2527 unregister_cpu_notifier(&kvm_cpu_notifier);
2529 on_each_cpu(hardware_disable, NULL, 1);
2531 kvm_arch_hardware_unsetup();
2533 free_cpumask_var(cpus_hardware_enabled);
2535 __free_page(bad_page);
2542 EXPORT_SYMBOL_GPL(kvm_init);
2546 kvm_trace_cleanup();
2547 misc_deregister(&kvm_dev);
2548 kmem_cache_destroy(kvm_vcpu_cache);
2549 sysdev_unregister(&kvm_sysdev);
2550 sysdev_class_unregister(&kvm_sysdev_class);
2551 unregister_reboot_notifier(&kvm_reboot_notifier);
2552 unregister_cpu_notifier(&kvm_cpu_notifier);
2553 on_each_cpu(hardware_disable, NULL, 1);
2554 kvm_arch_hardware_unsetup();
2557 free_cpumask_var(cpus_hardware_enabled);
2558 __free_page(bad_page);
2560 EXPORT_SYMBOL_GPL(kvm_exit);