2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
47 #include <asm/processor.h>
49 #include <asm/uaccess.h>
50 #include <asm/pgtable.h>
52 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
53 #include "coalesced_mmio.h"
56 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
57 #include <linux/pci.h>
58 #include <linux/interrupt.h>
62 #define CREATE_TRACE_POINTS
63 #include <trace/events/kvm.h>
65 MODULE_AUTHOR("Qumranet");
66 MODULE_LICENSE("GPL");
71 * kvm->lock --> kvm->irq_lock
74 DEFINE_SPINLOCK(kvm_lock
);
77 static cpumask_var_t cpus_hardware_enabled
;
79 struct kmem_cache
*kvm_vcpu_cache
;
80 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
82 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
84 struct dentry
*kvm_debugfs_dir
;
86 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
89 static bool kvm_rebooting
;
91 static bool largepages_enabled
= true;
93 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
94 static struct kvm_assigned_dev_kernel
*kvm_find_assigned_dev(struct list_head
*head
,
97 struct list_head
*ptr
;
98 struct kvm_assigned_dev_kernel
*match
;
100 list_for_each(ptr
, head
) {
101 match
= list_entry(ptr
, struct kvm_assigned_dev_kernel
, list
);
102 if (match
->assigned_dev_id
== assigned_dev_id
)
108 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
109 *assigned_dev
, int irq
)
112 struct msix_entry
*host_msix_entries
;
114 host_msix_entries
= assigned_dev
->host_msix_entries
;
117 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++)
118 if (irq
== host_msix_entries
[i
].vector
) {
123 printk(KERN_WARNING
"Fail to find correlated MSI-X entry!\n");
130 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct
*work
)
132 struct kvm_assigned_dev_kernel
*assigned_dev
;
136 assigned_dev
= container_of(work
, struct kvm_assigned_dev_kernel
,
138 kvm
= assigned_dev
->kvm
;
140 mutex_lock(&kvm
->irq_lock
);
141 spin_lock_irq(&assigned_dev
->assigned_dev_lock
);
142 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSIX
) {
143 struct kvm_guest_msix_entry
*guest_entries
=
144 assigned_dev
->guest_msix_entries
;
145 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++) {
146 if (!(guest_entries
[i
].flags
&
147 KVM_ASSIGNED_MSIX_PENDING
))
149 guest_entries
[i
].flags
&= ~KVM_ASSIGNED_MSIX_PENDING
;
150 kvm_set_irq(assigned_dev
->kvm
,
151 assigned_dev
->irq_source_id
,
152 guest_entries
[i
].vector
, 1);
155 kvm_set_irq(assigned_dev
->kvm
, assigned_dev
->irq_source_id
,
156 assigned_dev
->guest_irq
, 1);
158 spin_unlock_irq(&assigned_dev
->assigned_dev_lock
);
159 mutex_unlock(&assigned_dev
->kvm
->irq_lock
);
162 static irqreturn_t
kvm_assigned_dev_intr(int irq
, void *dev_id
)
165 struct kvm_assigned_dev_kernel
*assigned_dev
=
166 (struct kvm_assigned_dev_kernel
*) dev_id
;
168 spin_lock_irqsave(&assigned_dev
->assigned_dev_lock
, flags
);
169 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_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 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_GUEST_INTX
) {
180 disable_irq_nosync(irq
);
181 assigned_dev
->host_irq_disabled
= true;
185 spin_unlock_irqrestore(&assigned_dev
->assigned_dev_lock
, flags
);
189 /* Ack the irq line for an assigned device */
190 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier
*kian
)
192 struct kvm_assigned_dev_kernel
*dev
;
198 dev
= container_of(kian
, struct kvm_assigned_dev_kernel
,
201 kvm_set_irq(dev
->kvm
, dev
->irq_source_id
, dev
->guest_irq
, 0);
203 /* The guest irq may be shared so this ack may be
204 * from another device.
206 spin_lock_irqsave(&dev
->assigned_dev_lock
, flags
);
207 if (dev
->host_irq_disabled
) {
208 enable_irq(dev
->host_irq
);
209 dev
->host_irq_disabled
= false;
211 spin_unlock_irqrestore(&dev
->assigned_dev_lock
, flags
);
214 static void deassign_guest_irq(struct kvm
*kvm
,
215 struct kvm_assigned_dev_kernel
*assigned_dev
)
217 kvm_unregister_irq_ack_notifier(kvm
, &assigned_dev
->ack_notifier
);
218 assigned_dev
->ack_notifier
.gsi
= -1;
220 if (assigned_dev
->irq_source_id
!= -1)
221 kvm_free_irq_source_id(kvm
, assigned_dev
->irq_source_id
);
222 assigned_dev
->irq_source_id
= -1;
223 assigned_dev
->irq_requested_type
&= ~(KVM_DEV_IRQ_GUEST_MASK
);
226 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
227 static void deassign_host_irq(struct kvm
*kvm
,
228 struct kvm_assigned_dev_kernel
*assigned_dev
)
231 * In kvm_free_device_irq, cancel_work_sync return true if:
232 * 1. work is scheduled, and then cancelled.
233 * 2. work callback is executed.
235 * The first one ensured that the irq is disabled and no more events
236 * would happen. But for the second one, the irq may be enabled (e.g.
237 * for MSI). So we disable irq here to prevent further events.
239 * Notice this maybe result in nested disable if the interrupt type is
240 * INTx, but it's OK for we are going to free it.
242 * If this function is a part of VM destroy, please ensure that till
243 * now, the kvm state is still legal for probably we also have to wait
244 * interrupt_work done.
246 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSIX
) {
248 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++)
249 disable_irq_nosync(assigned_dev
->
250 host_msix_entries
[i
].vector
);
252 cancel_work_sync(&assigned_dev
->interrupt_work
);
254 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++)
255 free_irq(assigned_dev
->host_msix_entries
[i
].vector
,
256 (void *)assigned_dev
);
258 assigned_dev
->entries_nr
= 0;
259 kfree(assigned_dev
->host_msix_entries
);
260 kfree(assigned_dev
->guest_msix_entries
);
261 pci_disable_msix(assigned_dev
->dev
);
263 /* Deal with MSI and INTx */
264 disable_irq_nosync(assigned_dev
->host_irq
);
265 cancel_work_sync(&assigned_dev
->interrupt_work
);
267 free_irq(assigned_dev
->host_irq
, (void *)assigned_dev
);
269 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSI
)
270 pci_disable_msi(assigned_dev
->dev
);
273 assigned_dev
->irq_requested_type
&= ~(KVM_DEV_IRQ_HOST_MASK
);
276 static int kvm_deassign_irq(struct kvm
*kvm
,
277 struct kvm_assigned_dev_kernel
*assigned_dev
,
278 unsigned long irq_requested_type
)
280 unsigned long guest_irq_type
, host_irq_type
;
282 if (!irqchip_in_kernel(kvm
))
284 /* no irq assignment to deassign */
285 if (!assigned_dev
->irq_requested_type
)
288 host_irq_type
= irq_requested_type
& KVM_DEV_IRQ_HOST_MASK
;
289 guest_irq_type
= irq_requested_type
& KVM_DEV_IRQ_GUEST_MASK
;
292 deassign_host_irq(kvm
, assigned_dev
);
294 deassign_guest_irq(kvm
, assigned_dev
);
299 static void kvm_free_assigned_irq(struct kvm
*kvm
,
300 struct kvm_assigned_dev_kernel
*assigned_dev
)
302 kvm_deassign_irq(kvm
, assigned_dev
, assigned_dev
->irq_requested_type
);
305 static void kvm_free_assigned_device(struct kvm
*kvm
,
306 struct kvm_assigned_dev_kernel
309 kvm_free_assigned_irq(kvm
, assigned_dev
);
311 pci_reset_function(assigned_dev
->dev
);
313 pci_release_regions(assigned_dev
->dev
);
314 pci_disable_device(assigned_dev
->dev
);
315 pci_dev_put(assigned_dev
->dev
);
317 list_del(&assigned_dev
->list
);
321 void kvm_free_all_assigned_devices(struct kvm
*kvm
)
323 struct list_head
*ptr
, *ptr2
;
324 struct kvm_assigned_dev_kernel
*assigned_dev
;
326 list_for_each_safe(ptr
, ptr2
, &kvm
->arch
.assigned_dev_head
) {
327 assigned_dev
= list_entry(ptr
,
328 struct kvm_assigned_dev_kernel
,
331 kvm_free_assigned_device(kvm
, assigned_dev
);
335 static int assigned_device_enable_host_intx(struct kvm
*kvm
,
336 struct kvm_assigned_dev_kernel
*dev
)
338 dev
->host_irq
= dev
->dev
->irq
;
339 /* Even though this is PCI, we don't want to use shared
340 * interrupts. Sharing host devices with guest-assigned devices
341 * on the same interrupt line is not a happy situation: there
342 * are going to be long delays in accepting, acking, etc.
344 if (request_irq(dev
->host_irq
, kvm_assigned_dev_intr
,
345 0, "kvm_assigned_intx_device", (void *)dev
))
350 #ifdef __KVM_HAVE_MSI
351 static int assigned_device_enable_host_msi(struct kvm
*kvm
,
352 struct kvm_assigned_dev_kernel
*dev
)
356 if (!dev
->dev
->msi_enabled
) {
357 r
= pci_enable_msi(dev
->dev
);
362 dev
->host_irq
= dev
->dev
->irq
;
363 if (request_irq(dev
->host_irq
, kvm_assigned_dev_intr
, 0,
364 "kvm_assigned_msi_device", (void *)dev
)) {
365 pci_disable_msi(dev
->dev
);
373 #ifdef __KVM_HAVE_MSIX
374 static int assigned_device_enable_host_msix(struct kvm
*kvm
,
375 struct kvm_assigned_dev_kernel
*dev
)
379 /* host_msix_entries and guest_msix_entries should have been
381 if (dev
->entries_nr
== 0)
384 r
= pci_enable_msix(dev
->dev
, dev
->host_msix_entries
, dev
->entries_nr
);
388 for (i
= 0; i
< dev
->entries_nr
; i
++) {
389 r
= request_irq(dev
->host_msix_entries
[i
].vector
,
390 kvm_assigned_dev_intr
, 0,
391 "kvm_assigned_msix_device",
393 /* FIXME: free requested_irq's on failure */
403 static int assigned_device_enable_guest_intx(struct kvm
*kvm
,
404 struct kvm_assigned_dev_kernel
*dev
,
405 struct kvm_assigned_irq
*irq
)
407 dev
->guest_irq
= irq
->guest_irq
;
408 dev
->ack_notifier
.gsi
= irq
->guest_irq
;
412 #ifdef __KVM_HAVE_MSI
413 static int assigned_device_enable_guest_msi(struct kvm
*kvm
,
414 struct kvm_assigned_dev_kernel
*dev
,
415 struct kvm_assigned_irq
*irq
)
417 dev
->guest_irq
= irq
->guest_irq
;
418 dev
->ack_notifier
.gsi
= -1;
419 dev
->host_irq_disabled
= false;
423 #ifdef __KVM_HAVE_MSIX
424 static int assigned_device_enable_guest_msix(struct kvm
*kvm
,
425 struct kvm_assigned_dev_kernel
*dev
,
426 struct kvm_assigned_irq
*irq
)
428 dev
->guest_irq
= irq
->guest_irq
;
429 dev
->ack_notifier
.gsi
= -1;
430 dev
->host_irq_disabled
= false;
435 static int assign_host_irq(struct kvm
*kvm
,
436 struct kvm_assigned_dev_kernel
*dev
,
441 if (dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MASK
)
444 switch (host_irq_type
) {
445 case KVM_DEV_IRQ_HOST_INTX
:
446 r
= assigned_device_enable_host_intx(kvm
, dev
);
448 #ifdef __KVM_HAVE_MSI
449 case KVM_DEV_IRQ_HOST_MSI
:
450 r
= assigned_device_enable_host_msi(kvm
, dev
);
453 #ifdef __KVM_HAVE_MSIX
454 case KVM_DEV_IRQ_HOST_MSIX
:
455 r
= assigned_device_enable_host_msix(kvm
, dev
);
463 dev
->irq_requested_type
|= host_irq_type
;
468 static int assign_guest_irq(struct kvm
*kvm
,
469 struct kvm_assigned_dev_kernel
*dev
,
470 struct kvm_assigned_irq
*irq
,
471 unsigned long guest_irq_type
)
476 if (dev
->irq_requested_type
& KVM_DEV_IRQ_GUEST_MASK
)
479 id
= kvm_request_irq_source_id(kvm
);
483 dev
->irq_source_id
= id
;
485 switch (guest_irq_type
) {
486 case KVM_DEV_IRQ_GUEST_INTX
:
487 r
= assigned_device_enable_guest_intx(kvm
, dev
, irq
);
489 #ifdef __KVM_HAVE_MSI
490 case KVM_DEV_IRQ_GUEST_MSI
:
491 r
= assigned_device_enable_guest_msi(kvm
, dev
, irq
);
494 #ifdef __KVM_HAVE_MSIX
495 case KVM_DEV_IRQ_GUEST_MSIX
:
496 r
= assigned_device_enable_guest_msix(kvm
, dev
, irq
);
504 dev
->irq_requested_type
|= guest_irq_type
;
505 kvm_register_irq_ack_notifier(kvm
, &dev
->ack_notifier
);
507 kvm_free_irq_source_id(kvm
, dev
->irq_source_id
);
512 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
513 static int kvm_vm_ioctl_assign_irq(struct kvm
*kvm
,
514 struct kvm_assigned_irq
*assigned_irq
)
517 struct kvm_assigned_dev_kernel
*match
;
518 unsigned long host_irq_type
, guest_irq_type
;
520 if (!capable(CAP_SYS_RAWIO
))
523 if (!irqchip_in_kernel(kvm
))
526 mutex_lock(&kvm
->lock
);
528 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
529 assigned_irq
->assigned_dev_id
);
533 host_irq_type
= (assigned_irq
->flags
& KVM_DEV_IRQ_HOST_MASK
);
534 guest_irq_type
= (assigned_irq
->flags
& KVM_DEV_IRQ_GUEST_MASK
);
537 /* can only assign one type at a time */
538 if (hweight_long(host_irq_type
) > 1)
540 if (hweight_long(guest_irq_type
) > 1)
542 if (host_irq_type
== 0 && guest_irq_type
== 0)
547 r
= assign_host_irq(kvm
, match
, host_irq_type
);
552 r
= assign_guest_irq(kvm
, match
, assigned_irq
, guest_irq_type
);
554 mutex_unlock(&kvm
->lock
);
558 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm
*kvm
,
559 struct kvm_assigned_irq
563 struct kvm_assigned_dev_kernel
*match
;
565 mutex_lock(&kvm
->lock
);
567 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
568 assigned_irq
->assigned_dev_id
);
572 r
= kvm_deassign_irq(kvm
, match
, assigned_irq
->flags
);
574 mutex_unlock(&kvm
->lock
);
578 static int kvm_vm_ioctl_assign_device(struct kvm
*kvm
,
579 struct kvm_assigned_pci_dev
*assigned_dev
)
582 struct kvm_assigned_dev_kernel
*match
;
585 down_read(&kvm
->slots_lock
);
586 mutex_lock(&kvm
->lock
);
588 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
589 assigned_dev
->assigned_dev_id
);
591 /* device already assigned */
596 match
= kzalloc(sizeof(struct kvm_assigned_dev_kernel
), GFP_KERNEL
);
598 printk(KERN_INFO
"%s: Couldn't allocate memory\n",
603 dev
= pci_get_bus_and_slot(assigned_dev
->busnr
,
604 assigned_dev
->devfn
);
606 printk(KERN_INFO
"%s: host device not found\n", __func__
);
610 if (pci_enable_device(dev
)) {
611 printk(KERN_INFO
"%s: Could not enable PCI device\n", __func__
);
615 r
= pci_request_regions(dev
, "kvm_assigned_device");
617 printk(KERN_INFO
"%s: Could not get access to device regions\n",
622 pci_reset_function(dev
);
624 match
->assigned_dev_id
= assigned_dev
->assigned_dev_id
;
625 match
->host_busnr
= assigned_dev
->busnr
;
626 match
->host_devfn
= assigned_dev
->devfn
;
627 match
->flags
= assigned_dev
->flags
;
629 spin_lock_init(&match
->assigned_dev_lock
);
630 match
->irq_source_id
= -1;
632 match
->ack_notifier
.irq_acked
= kvm_assigned_dev_ack_irq
;
633 INIT_WORK(&match
->interrupt_work
,
634 kvm_assigned_dev_interrupt_work_handler
);
636 list_add(&match
->list
, &kvm
->arch
.assigned_dev_head
);
638 if (assigned_dev
->flags
& KVM_DEV_ASSIGN_ENABLE_IOMMU
) {
639 if (!kvm
->arch
.iommu_domain
) {
640 r
= kvm_iommu_map_guest(kvm
);
644 r
= kvm_assign_device(kvm
, match
);
650 mutex_unlock(&kvm
->lock
);
651 up_read(&kvm
->slots_lock
);
654 list_del(&match
->list
);
655 pci_release_regions(dev
);
657 pci_disable_device(dev
);
662 mutex_unlock(&kvm
->lock
);
663 up_read(&kvm
->slots_lock
);
668 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
669 static int kvm_vm_ioctl_deassign_device(struct kvm
*kvm
,
670 struct kvm_assigned_pci_dev
*assigned_dev
)
673 struct kvm_assigned_dev_kernel
*match
;
675 mutex_lock(&kvm
->lock
);
677 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
678 assigned_dev
->assigned_dev_id
);
680 printk(KERN_INFO
"%s: device hasn't been assigned before, "
681 "so cannot be deassigned\n", __func__
);
686 if (match
->flags
& KVM_DEV_ASSIGN_ENABLE_IOMMU
)
687 kvm_deassign_device(kvm
, match
);
689 kvm_free_assigned_device(kvm
, match
);
692 mutex_unlock(&kvm
->lock
);
697 inline int kvm_is_mmio_pfn(pfn_t pfn
)
699 if (pfn_valid(pfn
)) {
700 struct page
*page
= compound_head(pfn_to_page(pfn
));
701 return PageReserved(page
);
708 * Switches to specified vcpu, until a matching vcpu_put()
710 void vcpu_load(struct kvm_vcpu
*vcpu
)
714 mutex_lock(&vcpu
->mutex
);
716 preempt_notifier_register(&vcpu
->preempt_notifier
);
717 kvm_arch_vcpu_load(vcpu
, cpu
);
721 void vcpu_put(struct kvm_vcpu
*vcpu
)
724 kvm_arch_vcpu_put(vcpu
);
725 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
727 mutex_unlock(&vcpu
->mutex
);
730 static void ack_flush(void *_completed
)
734 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
739 struct kvm_vcpu
*vcpu
;
741 if (alloc_cpumask_var(&cpus
, GFP_ATOMIC
))
745 spin_lock(&kvm
->requests_lock
);
746 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
747 if (test_and_set_bit(req
, &vcpu
->requests
))
750 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
)
751 cpumask_set_cpu(cpu
, cpus
);
753 if (unlikely(cpus
== NULL
))
754 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
755 else if (!cpumask_empty(cpus
))
756 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
759 spin_unlock(&kvm
->requests_lock
);
761 free_cpumask_var(cpus
);
765 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
767 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
768 ++kvm
->stat
.remote_tlb_flush
;
771 void kvm_reload_remote_mmus(struct kvm
*kvm
)
773 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
776 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
781 mutex_init(&vcpu
->mutex
);
785 init_waitqueue_head(&vcpu
->wq
);
787 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
792 vcpu
->run
= page_address(page
);
794 r
= kvm_arch_vcpu_init(vcpu
);
800 free_page((unsigned long)vcpu
->run
);
804 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
806 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
808 kvm_arch_vcpu_uninit(vcpu
);
809 free_page((unsigned long)vcpu
->run
);
811 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
813 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
814 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
816 return container_of(mn
, struct kvm
, mmu_notifier
);
819 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
820 struct mm_struct
*mm
,
821 unsigned long address
)
823 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
827 * When ->invalidate_page runs, the linux pte has been zapped
828 * already but the page is still allocated until
829 * ->invalidate_page returns. So if we increase the sequence
830 * here the kvm page fault will notice if the spte can't be
831 * established because the page is going to be freed. If
832 * instead the kvm page fault establishes the spte before
833 * ->invalidate_page runs, kvm_unmap_hva will release it
836 * The sequence increase only need to be seen at spin_unlock
837 * time, and not at spin_lock time.
839 * Increasing the sequence after the spin_unlock would be
840 * unsafe because the kvm page fault could then establish the
841 * pte after kvm_unmap_hva returned, without noticing the page
842 * is going to be freed.
844 spin_lock(&kvm
->mmu_lock
);
845 kvm
->mmu_notifier_seq
++;
846 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
847 spin_unlock(&kvm
->mmu_lock
);
849 /* we've to flush the tlb before the pages can be freed */
851 kvm_flush_remote_tlbs(kvm
);
855 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
856 struct mm_struct
*mm
,
860 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
861 int need_tlb_flush
= 0;
863 spin_lock(&kvm
->mmu_lock
);
865 * The count increase must become visible at unlock time as no
866 * spte can be established without taking the mmu_lock and
867 * count is also read inside the mmu_lock critical section.
869 kvm
->mmu_notifier_count
++;
870 for (; start
< end
; start
+= PAGE_SIZE
)
871 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
872 spin_unlock(&kvm
->mmu_lock
);
874 /* we've to flush the tlb before the pages can be freed */
876 kvm_flush_remote_tlbs(kvm
);
879 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
880 struct mm_struct
*mm
,
884 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
886 spin_lock(&kvm
->mmu_lock
);
888 * This sequence increase will notify the kvm page fault that
889 * the page that is going to be mapped in the spte could have
892 kvm
->mmu_notifier_seq
++;
894 * The above sequence increase must be visible before the
895 * below count decrease but both values are read by the kvm
896 * page fault under mmu_lock spinlock so we don't need to add
897 * a smb_wmb() here in between the two.
899 kvm
->mmu_notifier_count
--;
900 spin_unlock(&kvm
->mmu_lock
);
902 BUG_ON(kvm
->mmu_notifier_count
< 0);
905 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
906 struct mm_struct
*mm
,
907 unsigned long address
)
909 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
912 spin_lock(&kvm
->mmu_lock
);
913 young
= kvm_age_hva(kvm
, address
);
914 spin_unlock(&kvm
->mmu_lock
);
917 kvm_flush_remote_tlbs(kvm
);
922 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
923 struct mm_struct
*mm
)
925 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
926 kvm_arch_flush_shadow(kvm
);
929 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
930 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
931 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
932 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
933 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
934 .release
= kvm_mmu_notifier_release
,
936 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
938 static struct kvm
*kvm_create_vm(void)
940 struct kvm
*kvm
= kvm_arch_create_vm();
941 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
947 #ifdef CONFIG_HAVE_KVM_IRQCHIP
948 INIT_LIST_HEAD(&kvm
->irq_routing
);
949 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
952 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
953 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
956 return ERR_PTR(-ENOMEM
);
958 kvm
->coalesced_mmio_ring
=
959 (struct kvm_coalesced_mmio_ring
*)page_address(page
);
962 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
965 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
966 err
= mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
968 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
977 kvm
->mm
= current
->mm
;
978 atomic_inc(&kvm
->mm
->mm_count
);
979 spin_lock_init(&kvm
->mmu_lock
);
980 spin_lock_init(&kvm
->requests_lock
);
981 kvm_io_bus_init(&kvm
->pio_bus
);
983 mutex_init(&kvm
->lock
);
984 mutex_init(&kvm
->irq_lock
);
985 kvm_io_bus_init(&kvm
->mmio_bus
);
986 init_rwsem(&kvm
->slots_lock
);
987 atomic_set(&kvm
->users_count
, 1);
988 spin_lock(&kvm_lock
);
989 list_add(&kvm
->vm_list
, &vm_list
);
990 spin_unlock(&kvm_lock
);
991 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
992 kvm_coalesced_mmio_init(kvm
);
999 * Free any memory in @free but not in @dont.
1001 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
1002 struct kvm_memory_slot
*dont
)
1004 if (!dont
|| free
->rmap
!= dont
->rmap
)
1007 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
1008 vfree(free
->dirty_bitmap
);
1010 if (!dont
|| free
->lpage_info
!= dont
->lpage_info
)
1011 vfree(free
->lpage_info
);
1014 free
->dirty_bitmap
= NULL
;
1016 free
->lpage_info
= NULL
;
1019 void kvm_free_physmem(struct kvm
*kvm
)
1023 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
1024 kvm_free_physmem_slot(&kvm
->memslots
[i
], NULL
);
1027 static void kvm_destroy_vm(struct kvm
*kvm
)
1029 struct mm_struct
*mm
= kvm
->mm
;
1031 kvm_arch_sync_events(kvm
);
1032 spin_lock(&kvm_lock
);
1033 list_del(&kvm
->vm_list
);
1034 spin_unlock(&kvm_lock
);
1035 kvm_free_irq_routing(kvm
);
1036 kvm_io_bus_destroy(&kvm
->pio_bus
);
1037 kvm_io_bus_destroy(&kvm
->mmio_bus
);
1038 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1039 if (kvm
->coalesced_mmio_ring
!= NULL
)
1040 free_page((unsigned long)kvm
->coalesced_mmio_ring
);
1042 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1043 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
1045 kvm_arch_flush_shadow(kvm
);
1047 kvm_arch_destroy_vm(kvm
);
1051 void kvm_get_kvm(struct kvm
*kvm
)
1053 atomic_inc(&kvm
->users_count
);
1055 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
1057 void kvm_put_kvm(struct kvm
*kvm
)
1059 if (atomic_dec_and_test(&kvm
->users_count
))
1060 kvm_destroy_vm(kvm
);
1062 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
1065 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
1067 struct kvm
*kvm
= filp
->private_data
;
1069 kvm_irqfd_release(kvm
);
1076 * Allocate some memory and give it an address in the guest physical address
1079 * Discontiguous memory is allowed, mostly for framebuffers.
1081 * Must be called holding mmap_sem for write.
1083 int __kvm_set_memory_region(struct kvm
*kvm
,
1084 struct kvm_userspace_memory_region
*mem
,
1089 unsigned long npages
, ugfn
;
1090 unsigned long largepages
, i
;
1091 struct kvm_memory_slot
*memslot
;
1092 struct kvm_memory_slot old
, new;
1095 /* General sanity checks */
1096 if (mem
->memory_size
& (PAGE_SIZE
- 1))
1098 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
1100 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
1102 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
1104 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
1107 memslot
= &kvm
->memslots
[mem
->slot
];
1108 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
1109 npages
= mem
->memory_size
>> PAGE_SHIFT
;
1112 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
1114 new = old
= *memslot
;
1116 new.base_gfn
= base_gfn
;
1117 new.npages
= npages
;
1118 new.flags
= mem
->flags
;
1120 /* Disallow changing a memory slot's size. */
1122 if (npages
&& old
.npages
&& npages
!= old
.npages
)
1125 /* Check for overlaps */
1127 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1128 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
1130 if (s
== memslot
|| !s
->npages
)
1132 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
1133 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
1137 /* Free page dirty bitmap if unneeded */
1138 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
1139 new.dirty_bitmap
= NULL
;
1143 /* Allocate if a slot is being created */
1145 if (npages
&& !new.rmap
) {
1146 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
1151 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
1153 new.user_alloc
= user_alloc
;
1155 * hva_to_rmmap() serialzies with the mmu_lock and to be
1156 * safe it has to ignore memslots with !user_alloc &&
1160 new.userspace_addr
= mem
->userspace_addr
;
1162 new.userspace_addr
= 0;
1164 if (npages
&& !new.lpage_info
) {
1165 largepages
= 1 + (base_gfn
+ npages
- 1) / KVM_PAGES_PER_HPAGE
;
1166 largepages
-= base_gfn
/ KVM_PAGES_PER_HPAGE
;
1168 new.lpage_info
= vmalloc(largepages
* sizeof(*new.lpage_info
));
1170 if (!new.lpage_info
)
1173 memset(new.lpage_info
, 0, largepages
* sizeof(*new.lpage_info
));
1175 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
1176 new.lpage_info
[0].write_count
= 1;
1177 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE
)
1178 new.lpage_info
[largepages
-1].write_count
= 1;
1179 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
1181 * If the gfn and userspace address are not aligned wrt each
1182 * other, or if explicitly asked to, disable large page
1183 * support for this slot
1185 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE
- 1) ||
1186 !largepages_enabled
)
1187 for (i
= 0; i
< largepages
; ++i
)
1188 new.lpage_info
[i
].write_count
= 1;
1191 /* Allocate page dirty bitmap if needed */
1192 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
1193 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
1195 new.dirty_bitmap
= vmalloc(dirty_bytes
);
1196 if (!new.dirty_bitmap
)
1198 memset(new.dirty_bitmap
, 0, dirty_bytes
);
1200 kvm_arch_flush_shadow(kvm
);
1202 #else /* not defined CONFIG_S390 */
1203 new.user_alloc
= user_alloc
;
1205 new.userspace_addr
= mem
->userspace_addr
;
1206 #endif /* not defined CONFIG_S390 */
1209 kvm_arch_flush_shadow(kvm
);
1211 spin_lock(&kvm
->mmu_lock
);
1212 if (mem
->slot
>= kvm
->nmemslots
)
1213 kvm
->nmemslots
= mem
->slot
+ 1;
1216 spin_unlock(&kvm
->mmu_lock
);
1218 r
= kvm_arch_set_memory_region(kvm
, mem
, old
, user_alloc
);
1220 spin_lock(&kvm
->mmu_lock
);
1222 spin_unlock(&kvm
->mmu_lock
);
1226 kvm_free_physmem_slot(&old
, npages
? &new : NULL
);
1227 /* Slot deletion case: we have to update the current slot */
1228 spin_lock(&kvm
->mmu_lock
);
1231 spin_unlock(&kvm
->mmu_lock
);
1233 /* map the pages in iommu page table */
1234 r
= kvm_iommu_map_pages(kvm
, base_gfn
, npages
);
1241 kvm_free_physmem_slot(&new, &old
);
1246 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1248 int kvm_set_memory_region(struct kvm
*kvm
,
1249 struct kvm_userspace_memory_region
*mem
,
1254 down_write(&kvm
->slots_lock
);
1255 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
1256 up_write(&kvm
->slots_lock
);
1259 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1261 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1263 kvm_userspace_memory_region
*mem
,
1266 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
1268 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
1271 int kvm_get_dirty_log(struct kvm
*kvm
,
1272 struct kvm_dirty_log
*log
, int *is_dirty
)
1274 struct kvm_memory_slot
*memslot
;
1277 unsigned long any
= 0;
1280 if (log
->slot
>= KVM_MEMORY_SLOTS
)
1283 memslot
= &kvm
->memslots
[log
->slot
];
1285 if (!memslot
->dirty_bitmap
)
1288 n
= ALIGN(memslot
->npages
, BITS_PER_LONG
) / 8;
1290 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1291 any
= memslot
->dirty_bitmap
[i
];
1294 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1305 void kvm_disable_largepages(void)
1307 largepages_enabled
= false;
1309 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1311 int is_error_page(struct page
*page
)
1313 return page
== bad_page
;
1315 EXPORT_SYMBOL_GPL(is_error_page
);
1317 int is_error_pfn(pfn_t pfn
)
1319 return pfn
== bad_pfn
;
1321 EXPORT_SYMBOL_GPL(is_error_pfn
);
1323 static inline unsigned long bad_hva(void)
1328 int kvm_is_error_hva(unsigned long addr
)
1330 return addr
== bad_hva();
1332 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
1334 struct kvm_memory_slot
*gfn_to_memslot_unaliased(struct kvm
*kvm
, gfn_t gfn
)
1338 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
1339 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
1341 if (gfn
>= memslot
->base_gfn
1342 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1347 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased
);
1349 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1351 gfn
= unalias_gfn(kvm
, gfn
);
1352 return gfn_to_memslot_unaliased(kvm
, gfn
);
1355 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1359 gfn
= unalias_gfn(kvm
, gfn
);
1360 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1361 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
1363 if (gfn
>= memslot
->base_gfn
1364 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1369 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1371 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1373 struct kvm_memory_slot
*slot
;
1375 gfn
= unalias_gfn(kvm
, gfn
);
1376 slot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1379 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
1381 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1383 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1385 struct page
*page
[1];
1392 addr
= gfn_to_hva(kvm
, gfn
);
1393 if (kvm_is_error_hva(addr
)) {
1395 return page_to_pfn(bad_page
);
1398 npages
= get_user_pages_fast(addr
, 1, 1, page
);
1400 if (unlikely(npages
!= 1)) {
1401 struct vm_area_struct
*vma
;
1403 down_read(¤t
->mm
->mmap_sem
);
1404 vma
= find_vma(current
->mm
, addr
);
1406 if (vma
== NULL
|| addr
< vma
->vm_start
||
1407 !(vma
->vm_flags
& VM_PFNMAP
)) {
1408 up_read(¤t
->mm
->mmap_sem
);
1410 return page_to_pfn(bad_page
);
1413 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
1414 up_read(¤t
->mm
->mmap_sem
);
1415 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1417 pfn
= page_to_pfn(page
[0]);
1422 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1424 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1428 pfn
= gfn_to_pfn(kvm
, gfn
);
1429 if (!kvm_is_mmio_pfn(pfn
))
1430 return pfn_to_page(pfn
);
1432 WARN_ON(kvm_is_mmio_pfn(pfn
));
1438 EXPORT_SYMBOL_GPL(gfn_to_page
);
1440 void kvm_release_page_clean(struct page
*page
)
1442 kvm_release_pfn_clean(page_to_pfn(page
));
1444 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1446 void kvm_release_pfn_clean(pfn_t pfn
)
1448 if (!kvm_is_mmio_pfn(pfn
))
1449 put_page(pfn_to_page(pfn
));
1451 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1453 void kvm_release_page_dirty(struct page
*page
)
1455 kvm_release_pfn_dirty(page_to_pfn(page
));
1457 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1459 void kvm_release_pfn_dirty(pfn_t pfn
)
1461 kvm_set_pfn_dirty(pfn
);
1462 kvm_release_pfn_clean(pfn
);
1464 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1466 void kvm_set_page_dirty(struct page
*page
)
1468 kvm_set_pfn_dirty(page_to_pfn(page
));
1470 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1472 void kvm_set_pfn_dirty(pfn_t pfn
)
1474 if (!kvm_is_mmio_pfn(pfn
)) {
1475 struct page
*page
= pfn_to_page(pfn
);
1476 if (!PageReserved(page
))
1480 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1482 void kvm_set_pfn_accessed(pfn_t pfn
)
1484 if (!kvm_is_mmio_pfn(pfn
))
1485 mark_page_accessed(pfn_to_page(pfn
));
1487 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1489 void kvm_get_pfn(pfn_t pfn
)
1491 if (!kvm_is_mmio_pfn(pfn
))
1492 get_page(pfn_to_page(pfn
));
1494 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1496 static int next_segment(unsigned long len
, int offset
)
1498 if (len
> PAGE_SIZE
- offset
)
1499 return PAGE_SIZE
- offset
;
1504 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1510 addr
= gfn_to_hva(kvm
, gfn
);
1511 if (kvm_is_error_hva(addr
))
1513 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1518 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1520 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1522 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1524 int offset
= offset_in_page(gpa
);
1527 while ((seg
= next_segment(len
, offset
)) != 0) {
1528 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1538 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1540 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1545 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1546 int offset
= offset_in_page(gpa
);
1548 addr
= gfn_to_hva(kvm
, gfn
);
1549 if (kvm_is_error_hva(addr
))
1551 pagefault_disable();
1552 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1558 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1560 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1561 int offset
, int len
)
1566 addr
= gfn_to_hva(kvm
, gfn
);
1567 if (kvm_is_error_hva(addr
))
1569 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1572 mark_page_dirty(kvm
, gfn
);
1575 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1577 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1580 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1582 int offset
= offset_in_page(gpa
);
1585 while ((seg
= next_segment(len
, offset
)) != 0) {
1586 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1597 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1599 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1601 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1603 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1605 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1607 int offset
= offset_in_page(gpa
);
1610 while ((seg
= next_segment(len
, offset
)) != 0) {
1611 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1620 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1622 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1624 struct kvm_memory_slot
*memslot
;
1626 gfn
= unalias_gfn(kvm
, gfn
);
1627 memslot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1628 if (memslot
&& memslot
->dirty_bitmap
) {
1629 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1632 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
1633 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
1638 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1640 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1645 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1647 if ((kvm_arch_interrupt_allowed(vcpu
) &&
1648 kvm_cpu_has_interrupt(vcpu
)) ||
1649 kvm_arch_vcpu_runnable(vcpu
)) {
1650 set_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
1653 if (kvm_cpu_has_pending_timer(vcpu
))
1655 if (signal_pending(current
))
1663 finish_wait(&vcpu
->wq
, &wait
);
1666 void kvm_resched(struct kvm_vcpu
*vcpu
)
1668 if (!need_resched())
1672 EXPORT_SYMBOL_GPL(kvm_resched
);
1674 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1676 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1679 if (vmf
->pgoff
== 0)
1680 page
= virt_to_page(vcpu
->run
);
1682 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1683 page
= virt_to_page(vcpu
->arch
.pio_data
);
1685 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1686 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1687 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1690 return VM_FAULT_SIGBUS
;
1696 static struct vm_operations_struct kvm_vcpu_vm_ops
= {
1697 .fault
= kvm_vcpu_fault
,
1700 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1702 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1706 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1708 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1710 kvm_put_kvm(vcpu
->kvm
);
1714 static struct file_operations kvm_vcpu_fops
= {
1715 .release
= kvm_vcpu_release
,
1716 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1717 .compat_ioctl
= kvm_vcpu_ioctl
,
1718 .mmap
= kvm_vcpu_mmap
,
1722 * Allocates an inode for the vcpu.
1724 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1726 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, 0);
1730 * Creates some virtual cpus. Good luck creating more than one.
1732 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1735 struct kvm_vcpu
*vcpu
, *v
;
1737 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1739 return PTR_ERR(vcpu
);
1741 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1743 r
= kvm_arch_vcpu_setup(vcpu
);
1747 mutex_lock(&kvm
->lock
);
1748 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1753 kvm_for_each_vcpu(r
, v
, kvm
)
1754 if (v
->vcpu_id
== id
) {
1759 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1761 /* Now it's all set up, let userspace reach it */
1763 r
= create_vcpu_fd(vcpu
);
1769 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1771 atomic_inc(&kvm
->online_vcpus
);
1773 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1774 if (kvm
->bsp_vcpu_id
== id
)
1775 kvm
->bsp_vcpu
= vcpu
;
1777 mutex_unlock(&kvm
->lock
);
1781 mutex_unlock(&kvm
->lock
);
1782 kvm_arch_vcpu_destroy(vcpu
);
1786 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1789 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1790 vcpu
->sigset_active
= 1;
1791 vcpu
->sigset
= *sigset
;
1793 vcpu
->sigset_active
= 0;
1797 #ifdef __KVM_HAVE_MSIX
1798 static int kvm_vm_ioctl_set_msix_nr(struct kvm
*kvm
,
1799 struct kvm_assigned_msix_nr
*entry_nr
)
1802 struct kvm_assigned_dev_kernel
*adev
;
1804 mutex_lock(&kvm
->lock
);
1806 adev
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
1807 entry_nr
->assigned_dev_id
);
1813 if (adev
->entries_nr
== 0) {
1814 adev
->entries_nr
= entry_nr
->entry_nr
;
1815 if (adev
->entries_nr
== 0 ||
1816 adev
->entries_nr
>= KVM_MAX_MSIX_PER_DEV
) {
1821 adev
->host_msix_entries
= kzalloc(sizeof(struct msix_entry
) *
1824 if (!adev
->host_msix_entries
) {
1828 adev
->guest_msix_entries
= kzalloc(
1829 sizeof(struct kvm_guest_msix_entry
) *
1830 entry_nr
->entry_nr
, GFP_KERNEL
);
1831 if (!adev
->guest_msix_entries
) {
1832 kfree(adev
->host_msix_entries
);
1836 } else /* Not allowed set MSI-X number twice */
1839 mutex_unlock(&kvm
->lock
);
1843 static int kvm_vm_ioctl_set_msix_entry(struct kvm
*kvm
,
1844 struct kvm_assigned_msix_entry
*entry
)
1847 struct kvm_assigned_dev_kernel
*adev
;
1849 mutex_lock(&kvm
->lock
);
1851 adev
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
1852 entry
->assigned_dev_id
);
1856 goto msix_entry_out
;
1859 for (i
= 0; i
< adev
->entries_nr
; i
++)
1860 if (adev
->guest_msix_entries
[i
].vector
== 0 ||
1861 adev
->guest_msix_entries
[i
].entry
== entry
->entry
) {
1862 adev
->guest_msix_entries
[i
].entry
= entry
->entry
;
1863 adev
->guest_msix_entries
[i
].vector
= entry
->gsi
;
1864 adev
->host_msix_entries
[i
].entry
= entry
->entry
;
1867 if (i
== adev
->entries_nr
) {
1869 goto msix_entry_out
;
1873 mutex_unlock(&kvm
->lock
);
1879 static long kvm_vcpu_ioctl(struct file
*filp
,
1880 unsigned int ioctl
, unsigned long arg
)
1882 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1883 void __user
*argp
= (void __user
*)arg
;
1885 struct kvm_fpu
*fpu
= NULL
;
1886 struct kvm_sregs
*kvm_sregs
= NULL
;
1888 if (vcpu
->kvm
->mm
!= current
->mm
)
1895 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1897 case KVM_GET_REGS
: {
1898 struct kvm_regs
*kvm_regs
;
1901 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1904 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1908 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1915 case KVM_SET_REGS
: {
1916 struct kvm_regs
*kvm_regs
;
1919 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1923 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1925 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1933 case KVM_GET_SREGS
: {
1934 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1938 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1942 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1947 case KVM_SET_SREGS
: {
1948 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1953 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1955 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1961 case KVM_GET_MP_STATE
: {
1962 struct kvm_mp_state mp_state
;
1964 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1968 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1973 case KVM_SET_MP_STATE
: {
1974 struct kvm_mp_state mp_state
;
1977 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1979 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1985 case KVM_TRANSLATE
: {
1986 struct kvm_translation tr
;
1989 if (copy_from_user(&tr
, argp
, sizeof tr
))
1991 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1995 if (copy_to_user(argp
, &tr
, sizeof tr
))
2000 case KVM_SET_GUEST_DEBUG
: {
2001 struct kvm_guest_debug dbg
;
2004 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2006 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2012 case KVM_SET_SIGNAL_MASK
: {
2013 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2014 struct kvm_signal_mask kvm_sigmask
;
2015 sigset_t sigset
, *p
;
2020 if (copy_from_user(&kvm_sigmask
, argp
,
2021 sizeof kvm_sigmask
))
2024 if (kvm_sigmask
.len
!= sizeof sigset
)
2027 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2032 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2036 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2040 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2044 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2050 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2055 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
2057 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2064 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2072 static long kvm_vm_ioctl(struct file
*filp
,
2073 unsigned int ioctl
, unsigned long arg
)
2075 struct kvm
*kvm
= filp
->private_data
;
2076 void __user
*argp
= (void __user
*)arg
;
2079 if (kvm
->mm
!= current
->mm
)
2082 case KVM_CREATE_VCPU
:
2083 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2087 case KVM_SET_USER_MEMORY_REGION
: {
2088 struct kvm_userspace_memory_region kvm_userspace_mem
;
2091 if (copy_from_user(&kvm_userspace_mem
, argp
,
2092 sizeof kvm_userspace_mem
))
2095 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
2100 case KVM_GET_DIRTY_LOG
: {
2101 struct kvm_dirty_log log
;
2104 if (copy_from_user(&log
, argp
, sizeof log
))
2106 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2111 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2112 case KVM_REGISTER_COALESCED_MMIO
: {
2113 struct kvm_coalesced_mmio_zone zone
;
2115 if (copy_from_user(&zone
, argp
, sizeof zone
))
2118 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2124 case KVM_UNREGISTER_COALESCED_MMIO
: {
2125 struct kvm_coalesced_mmio_zone zone
;
2127 if (copy_from_user(&zone
, argp
, sizeof zone
))
2130 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2137 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
2138 case KVM_ASSIGN_PCI_DEVICE
: {
2139 struct kvm_assigned_pci_dev assigned_dev
;
2142 if (copy_from_user(&assigned_dev
, argp
, sizeof assigned_dev
))
2144 r
= kvm_vm_ioctl_assign_device(kvm
, &assigned_dev
);
2149 case KVM_ASSIGN_IRQ
: {
2153 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
2154 case KVM_ASSIGN_DEV_IRQ
: {
2155 struct kvm_assigned_irq assigned_irq
;
2158 if (copy_from_user(&assigned_irq
, argp
, sizeof assigned_irq
))
2160 r
= kvm_vm_ioctl_assign_irq(kvm
, &assigned_irq
);
2165 case KVM_DEASSIGN_DEV_IRQ
: {
2166 struct kvm_assigned_irq assigned_irq
;
2169 if (copy_from_user(&assigned_irq
, argp
, sizeof assigned_irq
))
2171 r
= kvm_vm_ioctl_deassign_dev_irq(kvm
, &assigned_irq
);
2178 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
2179 case KVM_DEASSIGN_PCI_DEVICE
: {
2180 struct kvm_assigned_pci_dev assigned_dev
;
2183 if (copy_from_user(&assigned_dev
, argp
, sizeof assigned_dev
))
2185 r
= kvm_vm_ioctl_deassign_device(kvm
, &assigned_dev
);
2191 #ifdef KVM_CAP_IRQ_ROUTING
2192 case KVM_SET_GSI_ROUTING
: {
2193 struct kvm_irq_routing routing
;
2194 struct kvm_irq_routing __user
*urouting
;
2195 struct kvm_irq_routing_entry
*entries
;
2198 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2201 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2206 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2211 if (copy_from_user(entries
, urouting
->entries
,
2212 routing
.nr
* sizeof(*entries
)))
2213 goto out_free_irq_routing
;
2214 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2216 out_free_irq_routing
:
2220 #ifdef __KVM_HAVE_MSIX
2221 case KVM_ASSIGN_SET_MSIX_NR
: {
2222 struct kvm_assigned_msix_nr entry_nr
;
2224 if (copy_from_user(&entry_nr
, argp
, sizeof entry_nr
))
2226 r
= kvm_vm_ioctl_set_msix_nr(kvm
, &entry_nr
);
2231 case KVM_ASSIGN_SET_MSIX_ENTRY
: {
2232 struct kvm_assigned_msix_entry entry
;
2234 if (copy_from_user(&entry
, argp
, sizeof entry
))
2236 r
= kvm_vm_ioctl_set_msix_entry(kvm
, &entry
);
2242 #endif /* KVM_CAP_IRQ_ROUTING */
2244 struct kvm_irqfd data
;
2247 if (copy_from_user(&data
, argp
, sizeof data
))
2249 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
2252 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2253 case KVM_SET_BOOT_CPU_ID
:
2255 if (atomic_read(&kvm
->online_vcpus
) != 0)
2258 kvm
->bsp_vcpu_id
= arg
;
2262 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2268 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2270 struct page
*page
[1];
2273 gfn_t gfn
= vmf
->pgoff
;
2274 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2276 addr
= gfn_to_hva(kvm
, gfn
);
2277 if (kvm_is_error_hva(addr
))
2278 return VM_FAULT_SIGBUS
;
2280 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2282 if (unlikely(npages
!= 1))
2283 return VM_FAULT_SIGBUS
;
2285 vmf
->page
= page
[0];
2289 static struct vm_operations_struct kvm_vm_vm_ops
= {
2290 .fault
= kvm_vm_fault
,
2293 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2295 vma
->vm_ops
= &kvm_vm_vm_ops
;
2299 static struct file_operations kvm_vm_fops
= {
2300 .release
= kvm_vm_release
,
2301 .unlocked_ioctl
= kvm_vm_ioctl
,
2302 .compat_ioctl
= kvm_vm_ioctl
,
2303 .mmap
= kvm_vm_mmap
,
2306 static int kvm_dev_ioctl_create_vm(void)
2311 kvm
= kvm_create_vm();
2313 return PTR_ERR(kvm
);
2314 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, 0);
2321 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2324 case KVM_CAP_USER_MEMORY
:
2325 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2326 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2327 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2328 case KVM_CAP_SET_BOOT_CPU_ID
:
2331 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2332 case KVM_CAP_IRQ_ROUTING
:
2333 return KVM_MAX_IRQ_ROUTES
;
2338 return kvm_dev_ioctl_check_extension(arg
);
2341 static long kvm_dev_ioctl(struct file
*filp
,
2342 unsigned int ioctl
, unsigned long arg
)
2347 case KVM_GET_API_VERSION
:
2351 r
= KVM_API_VERSION
;
2357 r
= kvm_dev_ioctl_create_vm();
2359 case KVM_CHECK_EXTENSION
:
2360 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2362 case KVM_GET_VCPU_MMAP_SIZE
:
2366 r
= PAGE_SIZE
; /* struct kvm_run */
2368 r
+= PAGE_SIZE
; /* pio data page */
2370 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2371 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2374 case KVM_TRACE_ENABLE
:
2375 case KVM_TRACE_PAUSE
:
2376 case KVM_TRACE_DISABLE
:
2377 r
= kvm_trace_ioctl(ioctl
, arg
);
2380 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2386 static struct file_operations kvm_chardev_ops
= {
2387 .unlocked_ioctl
= kvm_dev_ioctl
,
2388 .compat_ioctl
= kvm_dev_ioctl
,
2391 static struct miscdevice kvm_dev
= {
2397 static void hardware_enable(void *junk
)
2399 int cpu
= raw_smp_processor_id();
2401 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2403 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2404 kvm_arch_hardware_enable(NULL
);
2407 static void hardware_disable(void *junk
)
2409 int cpu
= raw_smp_processor_id();
2411 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2413 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2414 kvm_arch_hardware_disable(NULL
);
2417 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2422 val
&= ~CPU_TASKS_FROZEN
;
2425 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2427 hardware_disable(NULL
);
2429 case CPU_UP_CANCELED
:
2430 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2432 smp_call_function_single(cpu
, hardware_disable
, NULL
, 1);
2435 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2437 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
2444 asmlinkage
void kvm_handle_fault_on_reboot(void)
2447 /* spin while reset goes on */
2450 /* Fault while not rebooting. We want the trace. */
2453 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
2455 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2459 * Some (well, at least mine) BIOSes hang on reboot if
2462 * And Intel TXT required VMX off for all cpu when system shutdown.
2464 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2465 kvm_rebooting
= true;
2466 on_each_cpu(hardware_disable
, NULL
, 1);
2470 static struct notifier_block kvm_reboot_notifier
= {
2471 .notifier_call
= kvm_reboot
,
2475 void kvm_io_bus_init(struct kvm_io_bus
*bus
)
2477 memset(bus
, 0, sizeof(*bus
));
2480 void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2484 for (i
= 0; i
< bus
->dev_count
; i
++) {
2485 struct kvm_io_device
*pos
= bus
->devs
[i
];
2487 kvm_iodevice_destructor(pos
);
2491 struct kvm_io_device
*kvm_io_bus_find_dev(struct kvm_io_bus
*bus
,
2492 gpa_t addr
, int len
, int is_write
)
2496 for (i
= 0; i
< bus
->dev_count
; i
++) {
2497 struct kvm_io_device
*pos
= bus
->devs
[i
];
2499 if (kvm_iodevice_in_range(pos
, addr
, len
, is_write
))
2506 void kvm_io_bus_register_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
)
2508 BUG_ON(bus
->dev_count
> (NR_IOBUS_DEVS
-1));
2510 bus
->devs
[bus
->dev_count
++] = dev
;
2513 static struct notifier_block kvm_cpu_notifier
= {
2514 .notifier_call
= kvm_cpu_hotplug
,
2515 .priority
= 20, /* must be > scheduler priority */
2518 static int vm_stat_get(void *_offset
, u64
*val
)
2520 unsigned offset
= (long)_offset
;
2524 spin_lock(&kvm_lock
);
2525 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2526 *val
+= *(u32
*)((void *)kvm
+ offset
);
2527 spin_unlock(&kvm_lock
);
2531 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2533 static int vcpu_stat_get(void *_offset
, u64
*val
)
2535 unsigned offset
= (long)_offset
;
2537 struct kvm_vcpu
*vcpu
;
2541 spin_lock(&kvm_lock
);
2542 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2543 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2544 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2546 spin_unlock(&kvm_lock
);
2550 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2552 static struct file_operations
*stat_fops
[] = {
2553 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2554 [KVM_STAT_VM
] = &vm_stat_fops
,
2557 static void kvm_init_debug(void)
2559 struct kvm_stats_debugfs_item
*p
;
2561 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2562 for (p
= debugfs_entries
; p
->name
; ++p
)
2563 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2564 (void *)(long)p
->offset
,
2565 stat_fops
[p
->kind
]);
2568 static void kvm_exit_debug(void)
2570 struct kvm_stats_debugfs_item
*p
;
2572 for (p
= debugfs_entries
; p
->name
; ++p
)
2573 debugfs_remove(p
->dentry
);
2574 debugfs_remove(kvm_debugfs_dir
);
2577 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2579 hardware_disable(NULL
);
2583 static int kvm_resume(struct sys_device
*dev
)
2585 hardware_enable(NULL
);
2589 static struct sysdev_class kvm_sysdev_class
= {
2591 .suspend
= kvm_suspend
,
2592 .resume
= kvm_resume
,
2595 static struct sys_device kvm_sysdev
= {
2597 .cls
= &kvm_sysdev_class
,
2600 struct page
*bad_page
;
2604 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2606 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2609 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2611 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2613 kvm_arch_vcpu_load(vcpu
, cpu
);
2616 static void kvm_sched_out(struct preempt_notifier
*pn
,
2617 struct task_struct
*next
)
2619 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2621 kvm_arch_vcpu_put(vcpu
);
2624 int kvm_init(void *opaque
, unsigned int vcpu_size
,
2625 struct module
*module
)
2632 r
= kvm_arch_init(opaque
);
2636 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2638 if (bad_page
== NULL
) {
2643 bad_pfn
= page_to_pfn(bad_page
);
2645 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2650 r
= kvm_arch_hardware_setup();
2654 for_each_online_cpu(cpu
) {
2655 smp_call_function_single(cpu
,
2656 kvm_arch_check_processor_compat
,
2662 on_each_cpu(hardware_enable
, NULL
, 1);
2663 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2666 register_reboot_notifier(&kvm_reboot_notifier
);
2668 r
= sysdev_class_register(&kvm_sysdev_class
);
2672 r
= sysdev_register(&kvm_sysdev
);
2676 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2677 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
,
2678 __alignof__(struct kvm_vcpu
),
2680 if (!kvm_vcpu_cache
) {
2685 kvm_chardev_ops
.owner
= module
;
2686 kvm_vm_fops
.owner
= module
;
2687 kvm_vcpu_fops
.owner
= module
;
2689 r
= misc_register(&kvm_dev
);
2691 printk(KERN_ERR
"kvm: misc device register failed\n");
2695 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2696 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2701 kmem_cache_destroy(kvm_vcpu_cache
);
2703 sysdev_unregister(&kvm_sysdev
);
2705 sysdev_class_unregister(&kvm_sysdev_class
);
2707 unregister_reboot_notifier(&kvm_reboot_notifier
);
2708 unregister_cpu_notifier(&kvm_cpu_notifier
);
2710 on_each_cpu(hardware_disable
, NULL
, 1);
2712 kvm_arch_hardware_unsetup();
2714 free_cpumask_var(cpus_hardware_enabled
);
2716 __free_page(bad_page
);
2723 EXPORT_SYMBOL_GPL(kvm_init
);
2727 kvm_trace_cleanup();
2728 tracepoint_synchronize_unregister();
2729 misc_deregister(&kvm_dev
);
2730 kmem_cache_destroy(kvm_vcpu_cache
);
2731 sysdev_unregister(&kvm_sysdev
);
2732 sysdev_class_unregister(&kvm_sysdev_class
);
2733 unregister_reboot_notifier(&kvm_reboot_notifier
);
2734 unregister_cpu_notifier(&kvm_cpu_notifier
);
2735 on_each_cpu(hardware_disable
, NULL
, 1);
2736 kvm_arch_hardware_unsetup();
2739 free_cpumask_var(cpus_hardware_enabled
);
2740 __free_page(bad_page
);
2742 EXPORT_SYMBOL_GPL(kvm_exit
);