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");
65 DEFINE_SPINLOCK(kvm_lock
);
68 static cpumask_var_t cpus_hardware_enabled
;
70 struct kmem_cache
*kvm_vcpu_cache
;
71 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
73 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
75 struct dentry
*kvm_debugfs_dir
;
77 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
80 static bool kvm_rebooting
;
82 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
83 static struct kvm_assigned_dev_kernel
*kvm_find_assigned_dev(struct list_head
*head
,
86 struct list_head
*ptr
;
87 struct kvm_assigned_dev_kernel
*match
;
89 list_for_each(ptr
, head
) {
90 match
= list_entry(ptr
, struct kvm_assigned_dev_kernel
, list
);
91 if (match
->assigned_dev_id
== assigned_dev_id
)
97 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
98 *assigned_dev
, int irq
)
101 struct msix_entry
*host_msix_entries
;
103 host_msix_entries
= assigned_dev
->host_msix_entries
;
106 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++)
107 if (irq
== host_msix_entries
[i
].vector
) {
112 printk(KERN_WARNING
"Fail to find correlated MSI-X entry!\n");
119 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct
*work
)
121 struct kvm_assigned_dev_kernel
*assigned_dev
;
125 assigned_dev
= container_of(work
, struct kvm_assigned_dev_kernel
,
127 kvm
= assigned_dev
->kvm
;
129 /* This is taken to safely inject irq inside the guest. When
130 * the interrupt injection (or the ioapic code) uses a
131 * finer-grained lock, update this
133 mutex_lock(&kvm
->lock
);
134 spin_lock_irq(&assigned_dev
->assigned_dev_lock
);
135 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSIX
) {
136 struct kvm_guest_msix_entry
*guest_entries
=
137 assigned_dev
->guest_msix_entries
;
138 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++) {
139 if (!(guest_entries
[i
].flags
&
140 KVM_ASSIGNED_MSIX_PENDING
))
142 guest_entries
[i
].flags
&= ~KVM_ASSIGNED_MSIX_PENDING
;
143 kvm_set_irq(assigned_dev
->kvm
,
144 assigned_dev
->irq_source_id
,
145 guest_entries
[i
].vector
, 1);
146 irq
= assigned_dev
->host_msix_entries
[i
].vector
;
149 assigned_dev
->host_irq_disabled
= false;
152 kvm_set_irq(assigned_dev
->kvm
, assigned_dev
->irq_source_id
,
153 assigned_dev
->guest_irq
, 1);
154 if (assigned_dev
->irq_requested_type
&
155 KVM_DEV_IRQ_GUEST_MSI
) {
156 enable_irq(assigned_dev
->host_irq
);
157 assigned_dev
->host_irq_disabled
= false;
161 spin_unlock_irq(&assigned_dev
->assigned_dev_lock
);
162 mutex_unlock(&assigned_dev
->kvm
->lock
);
165 static irqreturn_t
kvm_assigned_dev_intr(int irq
, void *dev_id
)
168 struct kvm_assigned_dev_kernel
*assigned_dev
=
169 (struct kvm_assigned_dev_kernel
*) dev_id
;
171 spin_lock_irqsave(&assigned_dev
->assigned_dev_lock
, flags
);
172 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSIX
) {
173 int index
= find_index_from_host_irq(assigned_dev
, irq
);
176 assigned_dev
->guest_msix_entries
[index
].flags
|=
177 KVM_ASSIGNED_MSIX_PENDING
;
180 schedule_work(&assigned_dev
->interrupt_work
);
182 disable_irq_nosync(irq
);
183 assigned_dev
->host_irq_disabled
= true;
186 spin_unlock_irqrestore(&assigned_dev
->assigned_dev_lock
, flags
);
190 /* Ack the irq line for an assigned device */
191 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier
*kian
)
193 struct kvm_assigned_dev_kernel
*dev
;
199 dev
= container_of(kian
, struct kvm_assigned_dev_kernel
,
202 kvm_set_irq(dev
->kvm
, dev
->irq_source_id
, dev
->guest_irq
, 0);
204 /* The guest irq may be shared so this ack may be
205 * from another device.
207 spin_lock_irqsave(&dev
->assigned_dev_lock
, flags
);
208 if (dev
->host_irq_disabled
) {
209 enable_irq(dev
->host_irq
);
210 dev
->host_irq_disabled
= false;
212 spin_unlock_irqrestore(&dev
->assigned_dev_lock
, flags
);
215 static void deassign_guest_irq(struct kvm
*kvm
,
216 struct kvm_assigned_dev_kernel
*assigned_dev
)
218 kvm_unregister_irq_ack_notifier(&assigned_dev
->ack_notifier
);
219 assigned_dev
->ack_notifier
.gsi
= -1;
221 if (assigned_dev
->irq_source_id
!= -1)
222 kvm_free_irq_source_id(kvm
, assigned_dev
->irq_source_id
);
223 assigned_dev
->irq_source_id
= -1;
224 assigned_dev
->irq_requested_type
&= ~(KVM_DEV_IRQ_GUEST_MASK
);
227 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
228 static void deassign_host_irq(struct kvm
*kvm
,
229 struct kvm_assigned_dev_kernel
*assigned_dev
)
232 * In kvm_free_device_irq, cancel_work_sync return true if:
233 * 1. work is scheduled, and then cancelled.
234 * 2. work callback is executed.
236 * The first one ensured that the irq is disabled and no more events
237 * would happen. But for the second one, the irq may be enabled (e.g.
238 * for MSI). So we disable irq here to prevent further events.
240 * Notice this maybe result in nested disable if the interrupt type is
241 * INTx, but it's OK for we are going to free it.
243 * If this function is a part of VM destroy, please ensure that till
244 * now, the kvm state is still legal for probably we also have to wait
245 * interrupt_work done.
247 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSIX
) {
249 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++)
250 disable_irq_nosync(assigned_dev
->
251 host_msix_entries
[i
].vector
);
253 cancel_work_sync(&assigned_dev
->interrupt_work
);
255 for (i
= 0; i
< assigned_dev
->entries_nr
; i
++)
256 free_irq(assigned_dev
->host_msix_entries
[i
].vector
,
257 (void *)assigned_dev
);
259 assigned_dev
->entries_nr
= 0;
260 kfree(assigned_dev
->host_msix_entries
);
261 kfree(assigned_dev
->guest_msix_entries
);
262 pci_disable_msix(assigned_dev
->dev
);
264 /* Deal with MSI and INTx */
265 disable_irq_nosync(assigned_dev
->host_irq
);
266 cancel_work_sync(&assigned_dev
->interrupt_work
);
268 free_irq(assigned_dev
->host_irq
, (void *)assigned_dev
);
270 if (assigned_dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MSI
)
271 pci_disable_msi(assigned_dev
->dev
);
274 assigned_dev
->irq_requested_type
&= ~(KVM_DEV_IRQ_HOST_MASK
);
277 static int kvm_deassign_irq(struct kvm
*kvm
,
278 struct kvm_assigned_dev_kernel
*assigned_dev
,
279 unsigned long irq_requested_type
)
281 unsigned long guest_irq_type
, host_irq_type
;
283 if (!irqchip_in_kernel(kvm
))
285 /* no irq assignment to deassign */
286 if (!assigned_dev
->irq_requested_type
)
289 host_irq_type
= irq_requested_type
& KVM_DEV_IRQ_HOST_MASK
;
290 guest_irq_type
= irq_requested_type
& KVM_DEV_IRQ_GUEST_MASK
;
293 deassign_host_irq(kvm
, assigned_dev
);
295 deassign_guest_irq(kvm
, assigned_dev
);
300 static void kvm_free_assigned_irq(struct kvm
*kvm
,
301 struct kvm_assigned_dev_kernel
*assigned_dev
)
303 kvm_deassign_irq(kvm
, assigned_dev
, assigned_dev
->irq_requested_type
);
306 static void kvm_free_assigned_device(struct kvm
*kvm
,
307 struct kvm_assigned_dev_kernel
310 kvm_free_assigned_irq(kvm
, assigned_dev
);
312 pci_reset_function(assigned_dev
->dev
);
314 pci_release_regions(assigned_dev
->dev
);
315 pci_disable_device(assigned_dev
->dev
);
316 pci_dev_put(assigned_dev
->dev
);
318 list_del(&assigned_dev
->list
);
322 void kvm_free_all_assigned_devices(struct kvm
*kvm
)
324 struct list_head
*ptr
, *ptr2
;
325 struct kvm_assigned_dev_kernel
*assigned_dev
;
327 list_for_each_safe(ptr
, ptr2
, &kvm
->arch
.assigned_dev_head
) {
328 assigned_dev
= list_entry(ptr
,
329 struct kvm_assigned_dev_kernel
,
332 kvm_free_assigned_device(kvm
, assigned_dev
);
336 static int assigned_device_enable_host_intx(struct kvm
*kvm
,
337 struct kvm_assigned_dev_kernel
*dev
)
339 dev
->host_irq
= dev
->dev
->irq
;
340 /* Even though this is PCI, we don't want to use shared
341 * interrupts. Sharing host devices with guest-assigned devices
342 * on the same interrupt line is not a happy situation: there
343 * are going to be long delays in accepting, acking, etc.
345 if (request_irq(dev
->host_irq
, kvm_assigned_dev_intr
,
346 0, "kvm_assigned_intx_device", (void *)dev
))
351 #ifdef __KVM_HAVE_MSI
352 static int assigned_device_enable_host_msi(struct kvm
*kvm
,
353 struct kvm_assigned_dev_kernel
*dev
)
357 if (!dev
->dev
->msi_enabled
) {
358 r
= pci_enable_msi(dev
->dev
);
363 dev
->host_irq
= dev
->dev
->irq
;
364 if (request_irq(dev
->host_irq
, kvm_assigned_dev_intr
, 0,
365 "kvm_assigned_msi_device", (void *)dev
)) {
366 pci_disable_msi(dev
->dev
);
374 #ifdef __KVM_HAVE_MSIX
375 static int assigned_device_enable_host_msix(struct kvm
*kvm
,
376 struct kvm_assigned_dev_kernel
*dev
)
380 /* host_msix_entries and guest_msix_entries should have been
382 if (dev
->entries_nr
== 0)
385 r
= pci_enable_msix(dev
->dev
, dev
->host_msix_entries
, dev
->entries_nr
);
389 for (i
= 0; i
< dev
->entries_nr
; i
++) {
390 r
= request_irq(dev
->host_msix_entries
[i
].vector
,
391 kvm_assigned_dev_intr
, 0,
392 "kvm_assigned_msix_device",
394 /* FIXME: free requested_irq's on failure */
404 static int assigned_device_enable_guest_intx(struct kvm
*kvm
,
405 struct kvm_assigned_dev_kernel
*dev
,
406 struct kvm_assigned_irq
*irq
)
408 dev
->guest_irq
= irq
->guest_irq
;
409 dev
->ack_notifier
.gsi
= irq
->guest_irq
;
413 #ifdef __KVM_HAVE_MSI
414 static int assigned_device_enable_guest_msi(struct kvm
*kvm
,
415 struct kvm_assigned_dev_kernel
*dev
,
416 struct kvm_assigned_irq
*irq
)
418 dev
->guest_irq
= irq
->guest_irq
;
419 dev
->ack_notifier
.gsi
= -1;
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;
434 static int assign_host_irq(struct kvm
*kvm
,
435 struct kvm_assigned_dev_kernel
*dev
,
440 if (dev
->irq_requested_type
& KVM_DEV_IRQ_HOST_MASK
)
443 switch (host_irq_type
) {
444 case KVM_DEV_IRQ_HOST_INTX
:
445 r
= assigned_device_enable_host_intx(kvm
, dev
);
447 #ifdef __KVM_HAVE_MSI
448 case KVM_DEV_IRQ_HOST_MSI
:
449 r
= assigned_device_enable_host_msi(kvm
, dev
);
452 #ifdef __KVM_HAVE_MSIX
453 case KVM_DEV_IRQ_HOST_MSIX
:
454 r
= assigned_device_enable_host_msix(kvm
, dev
);
462 dev
->irq_requested_type
|= host_irq_type
;
467 static int assign_guest_irq(struct kvm
*kvm
,
468 struct kvm_assigned_dev_kernel
*dev
,
469 struct kvm_assigned_irq
*irq
,
470 unsigned long guest_irq_type
)
475 if (dev
->irq_requested_type
& KVM_DEV_IRQ_GUEST_MASK
)
478 id
= kvm_request_irq_source_id(kvm
);
482 dev
->irq_source_id
= id
;
484 switch (guest_irq_type
) {
485 case KVM_DEV_IRQ_GUEST_INTX
:
486 r
= assigned_device_enable_guest_intx(kvm
, dev
, irq
);
488 #ifdef __KVM_HAVE_MSI
489 case KVM_DEV_IRQ_GUEST_MSI
:
490 r
= assigned_device_enable_guest_msi(kvm
, dev
, irq
);
493 #ifdef __KVM_HAVE_MSIX
494 case KVM_DEV_IRQ_GUEST_MSIX
:
495 r
= assigned_device_enable_guest_msix(kvm
, dev
, irq
);
503 dev
->irq_requested_type
|= guest_irq_type
;
504 kvm_register_irq_ack_notifier(kvm
, &dev
->ack_notifier
);
506 kvm_free_irq_source_id(kvm
, dev
->irq_source_id
);
511 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
512 static int kvm_vm_ioctl_assign_irq(struct kvm
*kvm
,
513 struct kvm_assigned_irq
*assigned_irq
)
516 struct kvm_assigned_dev_kernel
*match
;
517 unsigned long host_irq_type
, guest_irq_type
;
519 if (!capable(CAP_SYS_RAWIO
))
522 if (!irqchip_in_kernel(kvm
))
525 mutex_lock(&kvm
->lock
);
527 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
528 assigned_irq
->assigned_dev_id
);
532 host_irq_type
= (assigned_irq
->flags
& KVM_DEV_IRQ_HOST_MASK
);
533 guest_irq_type
= (assigned_irq
->flags
& KVM_DEV_IRQ_GUEST_MASK
);
536 /* can only assign one type at a time */
537 if (hweight_long(host_irq_type
) > 1)
539 if (hweight_long(guest_irq_type
) > 1)
541 if (host_irq_type
== 0 && guest_irq_type
== 0)
546 r
= assign_host_irq(kvm
, match
, host_irq_type
);
551 r
= assign_guest_irq(kvm
, match
, assigned_irq
, guest_irq_type
);
553 mutex_unlock(&kvm
->lock
);
557 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm
*kvm
,
558 struct kvm_assigned_irq
562 struct kvm_assigned_dev_kernel
*match
;
564 mutex_lock(&kvm
->lock
);
566 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
567 assigned_irq
->assigned_dev_id
);
571 r
= kvm_deassign_irq(kvm
, match
, assigned_irq
->flags
);
573 mutex_unlock(&kvm
->lock
);
577 static int kvm_vm_ioctl_assign_device(struct kvm
*kvm
,
578 struct kvm_assigned_pci_dev
*assigned_dev
)
581 struct kvm_assigned_dev_kernel
*match
;
584 down_read(&kvm
->slots_lock
);
585 mutex_lock(&kvm
->lock
);
587 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
588 assigned_dev
->assigned_dev_id
);
590 /* device already assigned */
595 match
= kzalloc(sizeof(struct kvm_assigned_dev_kernel
), GFP_KERNEL
);
597 printk(KERN_INFO
"%s: Couldn't allocate memory\n",
602 dev
= pci_get_bus_and_slot(assigned_dev
->busnr
,
603 assigned_dev
->devfn
);
605 printk(KERN_INFO
"%s: host device not found\n", __func__
);
609 if (pci_enable_device(dev
)) {
610 printk(KERN_INFO
"%s: Could not enable PCI device\n", __func__
);
614 r
= pci_request_regions(dev
, "kvm_assigned_device");
616 printk(KERN_INFO
"%s: Could not get access to device regions\n",
621 pci_reset_function(dev
);
623 match
->assigned_dev_id
= assigned_dev
->assigned_dev_id
;
624 match
->host_busnr
= assigned_dev
->busnr
;
625 match
->host_devfn
= assigned_dev
->devfn
;
626 match
->flags
= assigned_dev
->flags
;
628 spin_lock_init(&match
->assigned_dev_lock
);
629 match
->irq_source_id
= -1;
631 match
->ack_notifier
.irq_acked
= kvm_assigned_dev_ack_irq
;
632 INIT_WORK(&match
->interrupt_work
,
633 kvm_assigned_dev_interrupt_work_handler
);
635 list_add(&match
->list
, &kvm
->arch
.assigned_dev_head
);
637 if (assigned_dev
->flags
& KVM_DEV_ASSIGN_ENABLE_IOMMU
) {
638 if (!kvm
->arch
.iommu_domain
) {
639 r
= kvm_iommu_map_guest(kvm
);
643 r
= kvm_assign_device(kvm
, match
);
649 mutex_unlock(&kvm
->lock
);
650 up_read(&kvm
->slots_lock
);
653 list_del(&match
->list
);
654 pci_release_regions(dev
);
656 pci_disable_device(dev
);
661 mutex_unlock(&kvm
->lock
);
662 up_read(&kvm
->slots_lock
);
667 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
668 static int kvm_vm_ioctl_deassign_device(struct kvm
*kvm
,
669 struct kvm_assigned_pci_dev
*assigned_dev
)
672 struct kvm_assigned_dev_kernel
*match
;
674 mutex_lock(&kvm
->lock
);
676 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
677 assigned_dev
->assigned_dev_id
);
679 printk(KERN_INFO
"%s: device hasn't been assigned before, "
680 "so cannot be deassigned\n", __func__
);
685 if (match
->flags
& KVM_DEV_ASSIGN_ENABLE_IOMMU
)
686 kvm_deassign_device(kvm
, match
);
688 kvm_free_assigned_device(kvm
, match
);
691 mutex_unlock(&kvm
->lock
);
696 static inline int valid_vcpu(int n
)
698 return likely(n
>= 0 && n
< KVM_MAX_VCPUS
);
701 inline int kvm_is_mmio_pfn(pfn_t pfn
)
703 if (pfn_valid(pfn
)) {
704 struct page
*page
= compound_head(pfn_to_page(pfn
));
705 return PageReserved(page
);
712 * Switches to specified vcpu, until a matching vcpu_put()
714 void vcpu_load(struct kvm_vcpu
*vcpu
)
718 mutex_lock(&vcpu
->mutex
);
720 preempt_notifier_register(&vcpu
->preempt_notifier
);
721 kvm_arch_vcpu_load(vcpu
, cpu
);
725 void vcpu_put(struct kvm_vcpu
*vcpu
)
728 kvm_arch_vcpu_put(vcpu
);
729 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
731 mutex_unlock(&vcpu
->mutex
);
734 static void ack_flush(void *_completed
)
738 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
743 struct kvm_vcpu
*vcpu
;
745 if (alloc_cpumask_var(&cpus
, GFP_ATOMIC
))
749 spin_lock(&kvm
->requests_lock
);
750 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
751 vcpu
= kvm
->vcpus
[i
];
754 if (test_and_set_bit(req
, &vcpu
->requests
))
757 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
)
758 cpumask_set_cpu(cpu
, cpus
);
760 if (unlikely(cpus
== NULL
))
761 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
762 else if (!cpumask_empty(cpus
))
763 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
766 spin_unlock(&kvm
->requests_lock
);
768 free_cpumask_var(cpus
);
772 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
774 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
775 ++kvm
->stat
.remote_tlb_flush
;
778 void kvm_reload_remote_mmus(struct kvm
*kvm
)
780 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
783 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
788 mutex_init(&vcpu
->mutex
);
792 init_waitqueue_head(&vcpu
->wq
);
794 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
799 vcpu
->run
= page_address(page
);
801 r
= kvm_arch_vcpu_init(vcpu
);
807 free_page((unsigned long)vcpu
->run
);
811 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
813 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
815 kvm_arch_vcpu_uninit(vcpu
);
816 free_page((unsigned long)vcpu
->run
);
818 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
820 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
821 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
823 return container_of(mn
, struct kvm
, mmu_notifier
);
826 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
827 struct mm_struct
*mm
,
828 unsigned long address
)
830 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
834 * When ->invalidate_page runs, the linux pte has been zapped
835 * already but the page is still allocated until
836 * ->invalidate_page returns. So if we increase the sequence
837 * here the kvm page fault will notice if the spte can't be
838 * established because the page is going to be freed. If
839 * instead the kvm page fault establishes the spte before
840 * ->invalidate_page runs, kvm_unmap_hva will release it
843 * The sequence increase only need to be seen at spin_unlock
844 * time, and not at spin_lock time.
846 * Increasing the sequence after the spin_unlock would be
847 * unsafe because the kvm page fault could then establish the
848 * pte after kvm_unmap_hva returned, without noticing the page
849 * is going to be freed.
851 spin_lock(&kvm
->mmu_lock
);
852 kvm
->mmu_notifier_seq
++;
853 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
854 spin_unlock(&kvm
->mmu_lock
);
856 /* we've to flush the tlb before the pages can be freed */
858 kvm_flush_remote_tlbs(kvm
);
862 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
863 struct mm_struct
*mm
,
867 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
868 int need_tlb_flush
= 0;
870 spin_lock(&kvm
->mmu_lock
);
872 * The count increase must become visible at unlock time as no
873 * spte can be established without taking the mmu_lock and
874 * count is also read inside the mmu_lock critical section.
876 kvm
->mmu_notifier_count
++;
877 for (; start
< end
; start
+= PAGE_SIZE
)
878 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
879 spin_unlock(&kvm
->mmu_lock
);
881 /* we've to flush the tlb before the pages can be freed */
883 kvm_flush_remote_tlbs(kvm
);
886 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
887 struct mm_struct
*mm
,
891 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
893 spin_lock(&kvm
->mmu_lock
);
895 * This sequence increase will notify the kvm page fault that
896 * the page that is going to be mapped in the spte could have
899 kvm
->mmu_notifier_seq
++;
901 * The above sequence increase must be visible before the
902 * below count decrease but both values are read by the kvm
903 * page fault under mmu_lock spinlock so we don't need to add
904 * a smb_wmb() here in between the two.
906 kvm
->mmu_notifier_count
--;
907 spin_unlock(&kvm
->mmu_lock
);
909 BUG_ON(kvm
->mmu_notifier_count
< 0);
912 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
913 struct mm_struct
*mm
,
914 unsigned long address
)
916 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
919 spin_lock(&kvm
->mmu_lock
);
920 young
= kvm_age_hva(kvm
, address
);
921 spin_unlock(&kvm
->mmu_lock
);
924 kvm_flush_remote_tlbs(kvm
);
929 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
930 struct mm_struct
*mm
)
932 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
933 kvm_arch_flush_shadow(kvm
);
936 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
937 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
938 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
939 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
940 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
941 .release
= kvm_mmu_notifier_release
,
943 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
945 static struct kvm
*kvm_create_vm(void)
947 struct kvm
*kvm
= kvm_arch_create_vm();
948 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
954 #ifdef CONFIG_HAVE_KVM_IRQCHIP
955 INIT_LIST_HEAD(&kvm
->irq_routing
);
956 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
959 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
960 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
963 return ERR_PTR(-ENOMEM
);
965 kvm
->coalesced_mmio_ring
=
966 (struct kvm_coalesced_mmio_ring
*)page_address(page
);
969 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
972 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
973 err
= mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
975 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
984 kvm
->mm
= current
->mm
;
985 atomic_inc(&kvm
->mm
->mm_count
);
986 spin_lock_init(&kvm
->mmu_lock
);
987 spin_lock_init(&kvm
->requests_lock
);
988 kvm_io_bus_init(&kvm
->pio_bus
);
990 mutex_init(&kvm
->lock
);
991 kvm_io_bus_init(&kvm
->mmio_bus
);
992 init_rwsem(&kvm
->slots_lock
);
993 atomic_set(&kvm
->users_count
, 1);
994 spin_lock(&kvm_lock
);
995 list_add(&kvm
->vm_list
, &vm_list
);
996 spin_unlock(&kvm_lock
);
997 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
998 kvm_coalesced_mmio_init(kvm
);
1005 * Free any memory in @free but not in @dont.
1007 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
1008 struct kvm_memory_slot
*dont
)
1010 if (!dont
|| free
->rmap
!= dont
->rmap
)
1013 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
1014 vfree(free
->dirty_bitmap
);
1016 if (!dont
|| free
->lpage_info
!= dont
->lpage_info
)
1017 vfree(free
->lpage_info
);
1020 free
->dirty_bitmap
= NULL
;
1022 free
->lpage_info
= NULL
;
1025 void kvm_free_physmem(struct kvm
*kvm
)
1029 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
1030 kvm_free_physmem_slot(&kvm
->memslots
[i
], NULL
);
1033 static void kvm_destroy_vm(struct kvm
*kvm
)
1035 struct mm_struct
*mm
= kvm
->mm
;
1037 kvm_arch_sync_events(kvm
);
1038 spin_lock(&kvm_lock
);
1039 list_del(&kvm
->vm_list
);
1040 spin_unlock(&kvm_lock
);
1041 kvm_free_irq_routing(kvm
);
1042 kvm_io_bus_destroy(&kvm
->pio_bus
);
1043 kvm_io_bus_destroy(&kvm
->mmio_bus
);
1044 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1045 if (kvm
->coalesced_mmio_ring
!= NULL
)
1046 free_page((unsigned long)kvm
->coalesced_mmio_ring
);
1048 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
1049 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
1051 kvm_arch_flush_shadow(kvm
);
1053 kvm_arch_destroy_vm(kvm
);
1057 void kvm_get_kvm(struct kvm
*kvm
)
1059 atomic_inc(&kvm
->users_count
);
1061 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
1063 void kvm_put_kvm(struct kvm
*kvm
)
1065 if (atomic_dec_and_test(&kvm
->users_count
))
1066 kvm_destroy_vm(kvm
);
1068 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
1071 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
1073 struct kvm
*kvm
= filp
->private_data
;
1075 kvm_irqfd_release(kvm
);
1082 * Allocate some memory and give it an address in the guest physical address
1085 * Discontiguous memory is allowed, mostly for framebuffers.
1087 * Must be called holding mmap_sem for write.
1089 int __kvm_set_memory_region(struct kvm
*kvm
,
1090 struct kvm_userspace_memory_region
*mem
,
1095 unsigned long npages
, ugfn
;
1096 unsigned long largepages
, i
;
1097 struct kvm_memory_slot
*memslot
;
1098 struct kvm_memory_slot old
, new;
1101 /* General sanity checks */
1102 if (mem
->memory_size
& (PAGE_SIZE
- 1))
1104 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
1106 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
1108 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
1110 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
1113 memslot
= &kvm
->memslots
[mem
->slot
];
1114 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
1115 npages
= mem
->memory_size
>> PAGE_SHIFT
;
1118 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
1120 new = old
= *memslot
;
1122 new.base_gfn
= base_gfn
;
1123 new.npages
= npages
;
1124 new.flags
= mem
->flags
;
1126 /* Disallow changing a memory slot's size. */
1128 if (npages
&& old
.npages
&& npages
!= old
.npages
)
1131 /* Check for overlaps */
1133 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1134 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
1136 if (s
== memslot
|| !s
->npages
)
1138 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
1139 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
1143 /* Free page dirty bitmap if unneeded */
1144 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
1145 new.dirty_bitmap
= NULL
;
1149 /* Allocate if a slot is being created */
1151 if (npages
&& !new.rmap
) {
1152 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
1157 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
1159 new.user_alloc
= user_alloc
;
1161 * hva_to_rmmap() serialzies with the mmu_lock and to be
1162 * safe it has to ignore memslots with !user_alloc &&
1166 new.userspace_addr
= mem
->userspace_addr
;
1168 new.userspace_addr
= 0;
1170 if (npages
&& !new.lpage_info
) {
1171 largepages
= 1 + (base_gfn
+ npages
- 1) / KVM_PAGES_PER_HPAGE
;
1172 largepages
-= base_gfn
/ KVM_PAGES_PER_HPAGE
;
1174 new.lpage_info
= vmalloc(largepages
* sizeof(*new.lpage_info
));
1176 if (!new.lpage_info
)
1179 memset(new.lpage_info
, 0, largepages
* sizeof(*new.lpage_info
));
1181 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
1182 new.lpage_info
[0].write_count
= 1;
1183 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE
)
1184 new.lpage_info
[largepages
-1].write_count
= 1;
1185 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
1187 * If the gfn and userspace address are not aligned wrt each
1188 * other, disable large page support for this slot
1190 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE
- 1))
1191 for (i
= 0; i
< largepages
; ++i
)
1192 new.lpage_info
[i
].write_count
= 1;
1195 /* Allocate page dirty bitmap if needed */
1196 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
1197 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
1199 new.dirty_bitmap
= vmalloc(dirty_bytes
);
1200 if (!new.dirty_bitmap
)
1202 memset(new.dirty_bitmap
, 0, dirty_bytes
);
1204 kvm_arch_flush_shadow(kvm
);
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 int is_error_page(struct page
*page
)
1307 return page
== bad_page
;
1309 EXPORT_SYMBOL_GPL(is_error_page
);
1311 int is_error_pfn(pfn_t pfn
)
1313 return pfn
== bad_pfn
;
1315 EXPORT_SYMBOL_GPL(is_error_pfn
);
1317 static inline unsigned long bad_hva(void)
1322 int kvm_is_error_hva(unsigned long addr
)
1324 return addr
== bad_hva();
1326 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
1328 struct kvm_memory_slot
*gfn_to_memslot_unaliased(struct kvm
*kvm
, gfn_t gfn
)
1332 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
1333 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
1335 if (gfn
>= memslot
->base_gfn
1336 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1341 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased
);
1343 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1345 gfn
= unalias_gfn(kvm
, gfn
);
1346 return gfn_to_memslot_unaliased(kvm
, gfn
);
1349 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1353 gfn
= unalias_gfn(kvm
, gfn
);
1354 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1355 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
1357 if (gfn
>= memslot
->base_gfn
1358 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1363 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1365 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1367 struct kvm_memory_slot
*slot
;
1369 gfn
= unalias_gfn(kvm
, gfn
);
1370 slot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1373 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
1375 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1377 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1379 struct page
*page
[1];
1386 addr
= gfn_to_hva(kvm
, gfn
);
1387 if (kvm_is_error_hva(addr
)) {
1389 return page_to_pfn(bad_page
);
1392 npages
= get_user_pages_fast(addr
, 1, 1, page
);
1394 if (unlikely(npages
!= 1)) {
1395 struct vm_area_struct
*vma
;
1397 down_read(¤t
->mm
->mmap_sem
);
1398 vma
= find_vma(current
->mm
, addr
);
1400 if (vma
== NULL
|| addr
< vma
->vm_start
||
1401 !(vma
->vm_flags
& VM_PFNMAP
)) {
1402 up_read(¤t
->mm
->mmap_sem
);
1404 return page_to_pfn(bad_page
);
1407 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
1408 up_read(¤t
->mm
->mmap_sem
);
1409 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1411 pfn
= page_to_pfn(page
[0]);
1416 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1418 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1422 pfn
= gfn_to_pfn(kvm
, gfn
);
1423 if (!kvm_is_mmio_pfn(pfn
))
1424 return pfn_to_page(pfn
);
1426 WARN_ON(kvm_is_mmio_pfn(pfn
));
1432 EXPORT_SYMBOL_GPL(gfn_to_page
);
1434 void kvm_release_page_clean(struct page
*page
)
1436 kvm_release_pfn_clean(page_to_pfn(page
));
1438 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1440 void kvm_release_pfn_clean(pfn_t pfn
)
1442 if (!kvm_is_mmio_pfn(pfn
))
1443 put_page(pfn_to_page(pfn
));
1445 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1447 void kvm_release_page_dirty(struct page
*page
)
1449 kvm_release_pfn_dirty(page_to_pfn(page
));
1451 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1453 void kvm_release_pfn_dirty(pfn_t pfn
)
1455 kvm_set_pfn_dirty(pfn
);
1456 kvm_release_pfn_clean(pfn
);
1458 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1460 void kvm_set_page_dirty(struct page
*page
)
1462 kvm_set_pfn_dirty(page_to_pfn(page
));
1464 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1466 void kvm_set_pfn_dirty(pfn_t pfn
)
1468 if (!kvm_is_mmio_pfn(pfn
)) {
1469 struct page
*page
= pfn_to_page(pfn
);
1470 if (!PageReserved(page
))
1474 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1476 void kvm_set_pfn_accessed(pfn_t pfn
)
1478 if (!kvm_is_mmio_pfn(pfn
))
1479 mark_page_accessed(pfn_to_page(pfn
));
1481 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1483 void kvm_get_pfn(pfn_t pfn
)
1485 if (!kvm_is_mmio_pfn(pfn
))
1486 get_page(pfn_to_page(pfn
));
1488 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1490 static int next_segment(unsigned long len
, int offset
)
1492 if (len
> PAGE_SIZE
- offset
)
1493 return PAGE_SIZE
- offset
;
1498 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1504 addr
= gfn_to_hva(kvm
, gfn
);
1505 if (kvm_is_error_hva(addr
))
1507 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1512 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1514 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1516 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1518 int offset
= offset_in_page(gpa
);
1521 while ((seg
= next_segment(len
, offset
)) != 0) {
1522 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1532 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1534 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1539 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1540 int offset
= offset_in_page(gpa
);
1542 addr
= gfn_to_hva(kvm
, gfn
);
1543 if (kvm_is_error_hva(addr
))
1545 pagefault_disable();
1546 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1552 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1554 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1555 int offset
, int len
)
1560 addr
= gfn_to_hva(kvm
, gfn
);
1561 if (kvm_is_error_hva(addr
))
1563 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1566 mark_page_dirty(kvm
, gfn
);
1569 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1571 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1574 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1576 int offset
= offset_in_page(gpa
);
1579 while ((seg
= next_segment(len
, offset
)) != 0) {
1580 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1591 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1593 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1595 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1597 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1599 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1601 int offset
= offset_in_page(gpa
);
1604 while ((seg
= next_segment(len
, offset
)) != 0) {
1605 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1614 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1616 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1618 struct kvm_memory_slot
*memslot
;
1620 gfn
= unalias_gfn(kvm
, gfn
);
1621 memslot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1622 if (memslot
&& memslot
->dirty_bitmap
) {
1623 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1626 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
1627 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
1632 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1634 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1639 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1641 if ((kvm_arch_interrupt_allowed(vcpu
) &&
1642 kvm_cpu_has_interrupt(vcpu
)) ||
1643 kvm_arch_vcpu_runnable(vcpu
)) {
1644 set_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
1647 if (kvm_cpu_has_pending_timer(vcpu
))
1649 if (signal_pending(current
))
1657 finish_wait(&vcpu
->wq
, &wait
);
1660 void kvm_resched(struct kvm_vcpu
*vcpu
)
1662 if (!need_resched())
1666 EXPORT_SYMBOL_GPL(kvm_resched
);
1668 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1670 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1673 if (vmf
->pgoff
== 0)
1674 page
= virt_to_page(vcpu
->run
);
1676 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1677 page
= virt_to_page(vcpu
->arch
.pio_data
);
1679 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1680 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1681 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1684 return VM_FAULT_SIGBUS
;
1690 static struct vm_operations_struct kvm_vcpu_vm_ops
= {
1691 .fault
= kvm_vcpu_fault
,
1694 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1696 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1700 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1702 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1704 kvm_put_kvm(vcpu
->kvm
);
1708 static struct file_operations kvm_vcpu_fops
= {
1709 .release
= kvm_vcpu_release
,
1710 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1711 .compat_ioctl
= kvm_vcpu_ioctl
,
1712 .mmap
= kvm_vcpu_mmap
,
1716 * Allocates an inode for the vcpu.
1718 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1720 int fd
= anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, 0);
1722 kvm_put_kvm(vcpu
->kvm
);
1727 * Creates some virtual cpus. Good luck creating more than one.
1729 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
1732 struct kvm_vcpu
*vcpu
;
1737 vcpu
= kvm_arch_vcpu_create(kvm
, n
);
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 (kvm
->vcpus
[n
]) {
1752 kvm
->vcpus
[n
] = vcpu
;
1753 mutex_unlock(&kvm
->lock
);
1755 /* Now it's all set up, let userspace reach it */
1757 r
= create_vcpu_fd(vcpu
);
1763 mutex_lock(&kvm
->lock
);
1764 kvm
->vcpus
[n
] = NULL
;
1766 mutex_unlock(&kvm
->lock
);
1767 kvm_arch_vcpu_destroy(vcpu
);
1771 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1774 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1775 vcpu
->sigset_active
= 1;
1776 vcpu
->sigset
= *sigset
;
1778 vcpu
->sigset_active
= 0;
1782 #ifdef __KVM_HAVE_MSIX
1783 static int kvm_vm_ioctl_set_msix_nr(struct kvm
*kvm
,
1784 struct kvm_assigned_msix_nr
*entry_nr
)
1787 struct kvm_assigned_dev_kernel
*adev
;
1789 mutex_lock(&kvm
->lock
);
1791 adev
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
1792 entry_nr
->assigned_dev_id
);
1798 if (adev
->entries_nr
== 0) {
1799 adev
->entries_nr
= entry_nr
->entry_nr
;
1800 if (adev
->entries_nr
== 0 ||
1801 adev
->entries_nr
>= KVM_MAX_MSIX_PER_DEV
) {
1806 adev
->host_msix_entries
= kzalloc(sizeof(struct msix_entry
) *
1809 if (!adev
->host_msix_entries
) {
1813 adev
->guest_msix_entries
= kzalloc(
1814 sizeof(struct kvm_guest_msix_entry
) *
1815 entry_nr
->entry_nr
, GFP_KERNEL
);
1816 if (!adev
->guest_msix_entries
) {
1817 kfree(adev
->host_msix_entries
);
1821 } else /* Not allowed set MSI-X number twice */
1824 mutex_unlock(&kvm
->lock
);
1828 static int kvm_vm_ioctl_set_msix_entry(struct kvm
*kvm
,
1829 struct kvm_assigned_msix_entry
*entry
)
1832 struct kvm_assigned_dev_kernel
*adev
;
1834 mutex_lock(&kvm
->lock
);
1836 adev
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
1837 entry
->assigned_dev_id
);
1841 goto msix_entry_out
;
1844 for (i
= 0; i
< adev
->entries_nr
; i
++)
1845 if (adev
->guest_msix_entries
[i
].vector
== 0 ||
1846 adev
->guest_msix_entries
[i
].entry
== entry
->entry
) {
1847 adev
->guest_msix_entries
[i
].entry
= entry
->entry
;
1848 adev
->guest_msix_entries
[i
].vector
= entry
->gsi
;
1849 adev
->host_msix_entries
[i
].entry
= entry
->entry
;
1852 if (i
== adev
->entries_nr
) {
1854 goto msix_entry_out
;
1858 mutex_unlock(&kvm
->lock
);
1864 static long kvm_vcpu_ioctl(struct file
*filp
,
1865 unsigned int ioctl
, unsigned long arg
)
1867 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1868 void __user
*argp
= (void __user
*)arg
;
1870 struct kvm_fpu
*fpu
= NULL
;
1871 struct kvm_sregs
*kvm_sregs
= NULL
;
1873 if (vcpu
->kvm
->mm
!= current
->mm
)
1880 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1882 case KVM_GET_REGS
: {
1883 struct kvm_regs
*kvm_regs
;
1886 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1889 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1893 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1900 case KVM_SET_REGS
: {
1901 struct kvm_regs
*kvm_regs
;
1904 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1908 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1910 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1918 case KVM_GET_SREGS
: {
1919 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1923 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1927 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1932 case KVM_SET_SREGS
: {
1933 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1938 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1940 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1946 case KVM_GET_MP_STATE
: {
1947 struct kvm_mp_state mp_state
;
1949 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1953 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1958 case KVM_SET_MP_STATE
: {
1959 struct kvm_mp_state mp_state
;
1962 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1964 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1970 case KVM_TRANSLATE
: {
1971 struct kvm_translation tr
;
1974 if (copy_from_user(&tr
, argp
, sizeof tr
))
1976 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1980 if (copy_to_user(argp
, &tr
, sizeof tr
))
1985 case KVM_SET_GUEST_DEBUG
: {
1986 struct kvm_guest_debug dbg
;
1989 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1991 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1997 case KVM_SET_SIGNAL_MASK
: {
1998 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1999 struct kvm_signal_mask kvm_sigmask
;
2000 sigset_t sigset
, *p
;
2005 if (copy_from_user(&kvm_sigmask
, argp
,
2006 sizeof kvm_sigmask
))
2009 if (kvm_sigmask
.len
!= sizeof sigset
)
2012 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2017 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2021 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2025 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2029 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2035 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2040 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
2042 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2049 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2057 static long kvm_vm_ioctl(struct file
*filp
,
2058 unsigned int ioctl
, unsigned long arg
)
2060 struct kvm
*kvm
= filp
->private_data
;
2061 void __user
*argp
= (void __user
*)arg
;
2064 if (kvm
->mm
!= current
->mm
)
2067 case KVM_CREATE_VCPU
:
2068 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2072 case KVM_SET_USER_MEMORY_REGION
: {
2073 struct kvm_userspace_memory_region kvm_userspace_mem
;
2076 if (copy_from_user(&kvm_userspace_mem
, argp
,
2077 sizeof kvm_userspace_mem
))
2080 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
2085 case KVM_GET_DIRTY_LOG
: {
2086 struct kvm_dirty_log log
;
2089 if (copy_from_user(&log
, argp
, sizeof log
))
2091 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2096 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2097 case KVM_REGISTER_COALESCED_MMIO
: {
2098 struct kvm_coalesced_mmio_zone zone
;
2100 if (copy_from_user(&zone
, argp
, sizeof zone
))
2103 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2109 case KVM_UNREGISTER_COALESCED_MMIO
: {
2110 struct kvm_coalesced_mmio_zone zone
;
2112 if (copy_from_user(&zone
, argp
, sizeof zone
))
2115 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2122 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
2123 case KVM_ASSIGN_PCI_DEVICE
: {
2124 struct kvm_assigned_pci_dev assigned_dev
;
2127 if (copy_from_user(&assigned_dev
, argp
, sizeof assigned_dev
))
2129 r
= kvm_vm_ioctl_assign_device(kvm
, &assigned_dev
);
2134 case KVM_ASSIGN_IRQ
: {
2138 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
2139 case KVM_ASSIGN_DEV_IRQ
: {
2140 struct kvm_assigned_irq assigned_irq
;
2143 if (copy_from_user(&assigned_irq
, argp
, sizeof assigned_irq
))
2145 r
= kvm_vm_ioctl_assign_irq(kvm
, &assigned_irq
);
2150 case KVM_DEASSIGN_DEV_IRQ
: {
2151 struct kvm_assigned_irq assigned_irq
;
2154 if (copy_from_user(&assigned_irq
, argp
, sizeof assigned_irq
))
2156 r
= kvm_vm_ioctl_deassign_dev_irq(kvm
, &assigned_irq
);
2163 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
2164 case KVM_DEASSIGN_PCI_DEVICE
: {
2165 struct kvm_assigned_pci_dev assigned_dev
;
2168 if (copy_from_user(&assigned_dev
, argp
, sizeof assigned_dev
))
2170 r
= kvm_vm_ioctl_deassign_device(kvm
, &assigned_dev
);
2176 #ifdef KVM_CAP_IRQ_ROUTING
2177 case KVM_SET_GSI_ROUTING
: {
2178 struct kvm_irq_routing routing
;
2179 struct kvm_irq_routing __user
*urouting
;
2180 struct kvm_irq_routing_entry
*entries
;
2183 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2186 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2191 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2196 if (copy_from_user(entries
, urouting
->entries
,
2197 routing
.nr
* sizeof(*entries
)))
2198 goto out_free_irq_routing
;
2199 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2201 out_free_irq_routing
:
2205 #ifdef __KVM_HAVE_MSIX
2206 case KVM_ASSIGN_SET_MSIX_NR
: {
2207 struct kvm_assigned_msix_nr entry_nr
;
2209 if (copy_from_user(&entry_nr
, argp
, sizeof entry_nr
))
2211 r
= kvm_vm_ioctl_set_msix_nr(kvm
, &entry_nr
);
2216 case KVM_ASSIGN_SET_MSIX_ENTRY
: {
2217 struct kvm_assigned_msix_entry entry
;
2219 if (copy_from_user(&entry
, argp
, sizeof entry
))
2221 r
= kvm_vm_ioctl_set_msix_entry(kvm
, &entry
);
2227 #endif /* KVM_CAP_IRQ_ROUTING */
2229 struct kvm_irqfd data
;
2232 if (copy_from_user(&data
, argp
, sizeof data
))
2234 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
2238 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2244 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2246 struct page
*page
[1];
2249 gfn_t gfn
= vmf
->pgoff
;
2250 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2252 addr
= gfn_to_hva(kvm
, gfn
);
2253 if (kvm_is_error_hva(addr
))
2254 return VM_FAULT_SIGBUS
;
2256 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2258 if (unlikely(npages
!= 1))
2259 return VM_FAULT_SIGBUS
;
2261 vmf
->page
= page
[0];
2265 static struct vm_operations_struct kvm_vm_vm_ops
= {
2266 .fault
= kvm_vm_fault
,
2269 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2271 vma
->vm_ops
= &kvm_vm_vm_ops
;
2275 static struct file_operations kvm_vm_fops
= {
2276 .release
= kvm_vm_release
,
2277 .unlocked_ioctl
= kvm_vm_ioctl
,
2278 .compat_ioctl
= kvm_vm_ioctl
,
2279 .mmap
= kvm_vm_mmap
,
2282 static int kvm_dev_ioctl_create_vm(void)
2287 kvm
= kvm_create_vm();
2289 return PTR_ERR(kvm
);
2290 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, 0);
2297 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2300 case KVM_CAP_USER_MEMORY
:
2301 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2302 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2304 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2305 case KVM_CAP_IRQ_ROUTING
:
2306 return KVM_MAX_IRQ_ROUTES
;
2311 return kvm_dev_ioctl_check_extension(arg
);
2314 static long kvm_dev_ioctl(struct file
*filp
,
2315 unsigned int ioctl
, unsigned long arg
)
2320 case KVM_GET_API_VERSION
:
2324 r
= KVM_API_VERSION
;
2330 r
= kvm_dev_ioctl_create_vm();
2332 case KVM_CHECK_EXTENSION
:
2333 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2335 case KVM_GET_VCPU_MMAP_SIZE
:
2339 r
= PAGE_SIZE
; /* struct kvm_run */
2341 r
+= PAGE_SIZE
; /* pio data page */
2343 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2344 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2347 case KVM_TRACE_ENABLE
:
2348 case KVM_TRACE_PAUSE
:
2349 case KVM_TRACE_DISABLE
:
2350 r
= kvm_trace_ioctl(ioctl
, arg
);
2353 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2359 static struct file_operations kvm_chardev_ops
= {
2360 .unlocked_ioctl
= kvm_dev_ioctl
,
2361 .compat_ioctl
= kvm_dev_ioctl
,
2364 static struct miscdevice kvm_dev
= {
2370 static void hardware_enable(void *junk
)
2372 int cpu
= raw_smp_processor_id();
2374 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2376 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2377 kvm_arch_hardware_enable(NULL
);
2380 static void hardware_disable(void *junk
)
2382 int cpu
= raw_smp_processor_id();
2384 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2386 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2387 kvm_arch_hardware_disable(NULL
);
2390 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2395 val
&= ~CPU_TASKS_FROZEN
;
2398 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2400 hardware_disable(NULL
);
2402 case CPU_UP_CANCELED
:
2403 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2405 smp_call_function_single(cpu
, hardware_disable
, NULL
, 1);
2408 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2410 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
2417 asmlinkage
void kvm_handle_fault_on_reboot(void)
2420 /* spin while reset goes on */
2423 /* Fault while not rebooting. We want the trace. */
2426 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
2428 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2432 * Some (well, at least mine) BIOSes hang on reboot if
2435 * And Intel TXT required VMX off for all cpu when system shutdown.
2437 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2438 kvm_rebooting
= true;
2439 on_each_cpu(hardware_disable
, NULL
, 1);
2443 static struct notifier_block kvm_reboot_notifier
= {
2444 .notifier_call
= kvm_reboot
,
2448 void kvm_io_bus_init(struct kvm_io_bus
*bus
)
2450 memset(bus
, 0, sizeof(*bus
));
2453 void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2457 for (i
= 0; i
< bus
->dev_count
; i
++) {
2458 struct kvm_io_device
*pos
= bus
->devs
[i
];
2460 kvm_iodevice_destructor(pos
);
2464 struct kvm_io_device
*kvm_io_bus_find_dev(struct kvm_io_bus
*bus
,
2465 gpa_t addr
, int len
, int is_write
)
2469 for (i
= 0; i
< bus
->dev_count
; i
++) {
2470 struct kvm_io_device
*pos
= bus
->devs
[i
];
2472 if (pos
->in_range(pos
, addr
, len
, is_write
))
2479 void kvm_io_bus_register_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
)
2481 BUG_ON(bus
->dev_count
> (NR_IOBUS_DEVS
-1));
2483 bus
->devs
[bus
->dev_count
++] = dev
;
2486 static struct notifier_block kvm_cpu_notifier
= {
2487 .notifier_call
= kvm_cpu_hotplug
,
2488 .priority
= 20, /* must be > scheduler priority */
2491 static int vm_stat_get(void *_offset
, u64
*val
)
2493 unsigned offset
= (long)_offset
;
2497 spin_lock(&kvm_lock
);
2498 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2499 *val
+= *(u32
*)((void *)kvm
+ offset
);
2500 spin_unlock(&kvm_lock
);
2504 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2506 static int vcpu_stat_get(void *_offset
, u64
*val
)
2508 unsigned offset
= (long)_offset
;
2510 struct kvm_vcpu
*vcpu
;
2514 spin_lock(&kvm_lock
);
2515 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2516 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
2517 vcpu
= kvm
->vcpus
[i
];
2519 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2521 spin_unlock(&kvm_lock
);
2525 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2527 static struct file_operations
*stat_fops
[] = {
2528 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2529 [KVM_STAT_VM
] = &vm_stat_fops
,
2532 static void kvm_init_debug(void)
2534 struct kvm_stats_debugfs_item
*p
;
2536 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2537 for (p
= debugfs_entries
; p
->name
; ++p
)
2538 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2539 (void *)(long)p
->offset
,
2540 stat_fops
[p
->kind
]);
2543 static void kvm_exit_debug(void)
2545 struct kvm_stats_debugfs_item
*p
;
2547 for (p
= debugfs_entries
; p
->name
; ++p
)
2548 debugfs_remove(p
->dentry
);
2549 debugfs_remove(kvm_debugfs_dir
);
2552 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2554 hardware_disable(NULL
);
2558 static int kvm_resume(struct sys_device
*dev
)
2560 hardware_enable(NULL
);
2564 static struct sysdev_class kvm_sysdev_class
= {
2566 .suspend
= kvm_suspend
,
2567 .resume
= kvm_resume
,
2570 static struct sys_device kvm_sysdev
= {
2572 .cls
= &kvm_sysdev_class
,
2575 struct page
*bad_page
;
2579 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2581 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2584 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2586 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2588 kvm_arch_vcpu_load(vcpu
, cpu
);
2591 static void kvm_sched_out(struct preempt_notifier
*pn
,
2592 struct task_struct
*next
)
2594 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2596 kvm_arch_vcpu_put(vcpu
);
2599 int kvm_init(void *opaque
, unsigned int vcpu_size
,
2600 struct module
*module
)
2607 r
= kvm_arch_init(opaque
);
2611 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2613 if (bad_page
== NULL
) {
2618 bad_pfn
= page_to_pfn(bad_page
);
2620 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2625 r
= kvm_arch_hardware_setup();
2629 for_each_online_cpu(cpu
) {
2630 smp_call_function_single(cpu
,
2631 kvm_arch_check_processor_compat
,
2637 on_each_cpu(hardware_enable
, NULL
, 1);
2638 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2641 register_reboot_notifier(&kvm_reboot_notifier
);
2643 r
= sysdev_class_register(&kvm_sysdev_class
);
2647 r
= sysdev_register(&kvm_sysdev
);
2651 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2652 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
,
2653 __alignof__(struct kvm_vcpu
),
2655 if (!kvm_vcpu_cache
) {
2660 kvm_chardev_ops
.owner
= module
;
2661 kvm_vm_fops
.owner
= module
;
2662 kvm_vcpu_fops
.owner
= module
;
2664 r
= misc_register(&kvm_dev
);
2666 printk(KERN_ERR
"kvm: misc device register failed\n");
2670 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2671 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2676 kmem_cache_destroy(kvm_vcpu_cache
);
2678 sysdev_unregister(&kvm_sysdev
);
2680 sysdev_class_unregister(&kvm_sysdev_class
);
2682 unregister_reboot_notifier(&kvm_reboot_notifier
);
2683 unregister_cpu_notifier(&kvm_cpu_notifier
);
2685 on_each_cpu(hardware_disable
, NULL
, 1);
2687 kvm_arch_hardware_unsetup();
2689 free_cpumask_var(cpus_hardware_enabled
);
2691 __free_page(bad_page
);
2698 EXPORT_SYMBOL_GPL(kvm_init
);
2702 kvm_trace_cleanup();
2703 misc_deregister(&kvm_dev
);
2704 kmem_cache_destroy(kvm_vcpu_cache
);
2705 sysdev_unregister(&kvm_sysdev
);
2706 sysdev_class_unregister(&kvm_sysdev_class
);
2707 unregister_reboot_notifier(&kvm_reboot_notifier
);
2708 unregister_cpu_notifier(&kvm_cpu_notifier
);
2709 on_each_cpu(hardware_disable
, NULL
, 1);
2710 kvm_arch_hardware_unsetup();
2713 free_cpumask_var(cpus_hardware_enabled
);
2714 __free_page(bad_page
);
2716 EXPORT_SYMBOL_GPL(kvm_exit
);