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