2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
45 #include <asm/processor.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
51 #include <asm/msidef.h>
54 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
55 #include "coalesced_mmio.h"
58 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
59 #include <linux/pci.h>
60 #include <linux/interrupt.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
67 DEFINE_SPINLOCK(kvm_lock
);
70 static cpumask_t cpus_hardware_enabled
;
72 struct kmem_cache
*kvm_vcpu_cache
;
73 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
75 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
77 struct dentry
*kvm_debugfs_dir
;
79 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
84 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
87 static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel
*dev
)
90 struct kvm_vcpu
*vcpu
;
91 struct kvm_ioapic
*ioapic
= ioapic_irqchip(dev
->kvm
);
92 int dest_id
= (dev
->guest_msi
.address_lo
& MSI_ADDR_DEST_ID_MASK
)
93 >> MSI_ADDR_DEST_ID_SHIFT
;
94 int vector
= (dev
->guest_msi
.data
& MSI_DATA_VECTOR_MASK
)
95 >> MSI_DATA_VECTOR_SHIFT
;
96 int dest_mode
= test_bit(MSI_ADDR_DEST_MODE_SHIFT
,
97 (unsigned long *)&dev
->guest_msi
.address_lo
);
98 int trig_mode
= test_bit(MSI_DATA_TRIGGER_SHIFT
,
99 (unsigned long *)&dev
->guest_msi
.data
);
100 int delivery_mode
= test_bit(MSI_DATA_DELIVERY_MODE_SHIFT
,
101 (unsigned long *)&dev
->guest_msi
.data
);
106 deliver_bitmask
= kvm_ioapic_get_delivery_bitmask(ioapic
,
108 /* IOAPIC delivery mode value is the same as MSI here */
109 switch (delivery_mode
) {
110 case IOAPIC_LOWEST_PRIORITY
:
111 vcpu
= kvm_get_lowest_prio_vcpu(ioapic
->kvm
, vector
,
114 kvm_apic_set_irq(vcpu
, vector
, trig_mode
);
116 printk(KERN_INFO
"kvm: null lowest priority vcpu!\n");
119 for (vcpu_id
= 0; deliver_bitmask
!= 0; vcpu_id
++) {
120 if (!(deliver_bitmask
& (1 << vcpu_id
)))
122 deliver_bitmask
&= ~(1 << vcpu_id
);
123 vcpu
= ioapic
->kvm
->vcpus
[vcpu_id
];
125 kvm_apic_set_irq(vcpu
, vector
, trig_mode
);
129 printk(KERN_INFO
"kvm: unsupported MSI delivery mode\n");
133 static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel
*dev
) {}
136 static struct kvm_assigned_dev_kernel
*kvm_find_assigned_dev(struct list_head
*head
,
139 struct list_head
*ptr
;
140 struct kvm_assigned_dev_kernel
*match
;
142 list_for_each(ptr
, head
) {
143 match
= list_entry(ptr
, struct kvm_assigned_dev_kernel
, list
);
144 if (match
->assigned_dev_id
== assigned_dev_id
)
150 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct
*work
)
152 struct kvm_assigned_dev_kernel
*assigned_dev
;
154 assigned_dev
= container_of(work
, struct kvm_assigned_dev_kernel
,
157 /* This is taken to safely inject irq inside the guest. When
158 * the interrupt injection (or the ioapic code) uses a
159 * finer-grained lock, update this
161 mutex_lock(&assigned_dev
->kvm
->lock
);
162 if (assigned_dev
->irq_requested_type
& KVM_ASSIGNED_DEV_GUEST_INTX
)
163 kvm_set_irq(assigned_dev
->kvm
,
164 assigned_dev
->irq_source_id
,
165 assigned_dev
->guest_irq
, 1);
166 else if (assigned_dev
->irq_requested_type
&
167 KVM_ASSIGNED_DEV_GUEST_MSI
) {
168 assigned_device_msi_dispatch(assigned_dev
);
169 enable_irq(assigned_dev
->host_irq
);
171 mutex_unlock(&assigned_dev
->kvm
->lock
);
172 kvm_put_kvm(assigned_dev
->kvm
);
175 static irqreturn_t
kvm_assigned_dev_intr(int irq
, void *dev_id
)
177 struct kvm_assigned_dev_kernel
*assigned_dev
=
178 (struct kvm_assigned_dev_kernel
*) dev_id
;
180 kvm_get_kvm(assigned_dev
->kvm
);
181 schedule_work(&assigned_dev
->interrupt_work
);
182 disable_irq_nosync(irq
);
186 /* Ack the irq line for an assigned device */
187 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier
*kian
)
189 struct kvm_assigned_dev_kernel
*dev
;
194 dev
= container_of(kian
, struct kvm_assigned_dev_kernel
,
196 kvm_set_irq(dev
->kvm
, dev
->irq_source_id
, dev
->guest_irq
, 0);
197 enable_irq(dev
->host_irq
);
200 static void kvm_free_assigned_device(struct kvm
*kvm
,
201 struct kvm_assigned_dev_kernel
204 if (irqchip_in_kernel(kvm
) && assigned_dev
->irq_requested_type
)
205 free_irq(assigned_dev
->host_irq
, (void *)assigned_dev
);
206 if (assigned_dev
->irq_requested_type
& KVM_ASSIGNED_DEV_HOST_MSI
)
207 pci_disable_msi(assigned_dev
->dev
);
209 kvm_unregister_irq_ack_notifier(&assigned_dev
->ack_notifier
);
210 kvm_free_irq_source_id(kvm
, assigned_dev
->irq_source_id
);
212 if (cancel_work_sync(&assigned_dev
->interrupt_work
))
213 /* We had pending work. That means we will have to take
214 * care of kvm_put_kvm.
218 pci_reset_function(assigned_dev
->dev
);
220 pci_release_regions(assigned_dev
->dev
);
221 pci_disable_device(assigned_dev
->dev
);
222 pci_dev_put(assigned_dev
->dev
);
224 list_del(&assigned_dev
->list
);
228 void kvm_free_all_assigned_devices(struct kvm
*kvm
)
230 struct list_head
*ptr
, *ptr2
;
231 struct kvm_assigned_dev_kernel
*assigned_dev
;
233 list_for_each_safe(ptr
, ptr2
, &kvm
->arch
.assigned_dev_head
) {
234 assigned_dev
= list_entry(ptr
,
235 struct kvm_assigned_dev_kernel
,
238 kvm_free_assigned_device(kvm
, assigned_dev
);
242 static int assigned_device_update_intx(struct kvm
*kvm
,
243 struct kvm_assigned_dev_kernel
*adev
,
244 struct kvm_assigned_irq
*airq
)
246 adev
->guest_irq
= airq
->guest_irq
;
247 adev
->ack_notifier
.gsi
= airq
->guest_irq
;
249 if (adev
->irq_requested_type
& KVM_ASSIGNED_DEV_HOST_INTX
)
252 if (irqchip_in_kernel(kvm
)) {
253 if (adev
->irq_requested_type
& KVM_ASSIGNED_DEV_HOST_MSI
) {
254 free_irq(adev
->host_irq
, (void *)kvm
);
255 pci_disable_msi(adev
->dev
);
258 if (!capable(CAP_SYS_RAWIO
))
262 adev
->host_irq
= airq
->host_irq
;
264 adev
->host_irq
= adev
->dev
->irq
;
266 /* Even though this is PCI, we don't want to use shared
267 * interrupts. Sharing host devices with guest-assigned devices
268 * on the same interrupt line is not a happy situation: there
269 * are going to be long delays in accepting, acking, etc.
271 if (request_irq(adev
->host_irq
, kvm_assigned_dev_intr
,
272 0, "kvm_assigned_intx_device", (void *)adev
))
276 adev
->irq_requested_type
= KVM_ASSIGNED_DEV_GUEST_INTX
|
277 KVM_ASSIGNED_DEV_HOST_INTX
;
282 static int assigned_device_update_msi(struct kvm
*kvm
,
283 struct kvm_assigned_dev_kernel
*adev
,
284 struct kvm_assigned_irq
*airq
)
288 /* x86 don't care upper address of guest msi message addr */
289 adev
->guest_msi
.address_lo
= airq
->guest_msi
.addr_lo
;
290 adev
->guest_msi
.data
= airq
->guest_msi
.data
;
291 adev
->ack_notifier
.gsi
= -1;
293 if (adev
->irq_requested_type
& KVM_ASSIGNED_DEV_HOST_MSI
)
296 if (irqchip_in_kernel(kvm
)) {
297 if (adev
->irq_requested_type
& KVM_ASSIGNED_DEV_HOST_INTX
)
298 free_irq(adev
->host_irq
, (void *)adev
);
300 r
= pci_enable_msi(adev
->dev
);
304 adev
->host_irq
= adev
->dev
->irq
;
305 if (request_irq(adev
->host_irq
, kvm_assigned_dev_intr
, 0,
306 "kvm_assigned_msi_device", (void *)adev
))
310 adev
->irq_requested_type
= KVM_ASSIGNED_DEV_GUEST_MSI
|
311 KVM_ASSIGNED_DEV_HOST_MSI
;
316 static int kvm_vm_ioctl_assign_irq(struct kvm
*kvm
,
317 struct kvm_assigned_irq
321 struct kvm_assigned_dev_kernel
*match
;
323 mutex_lock(&kvm
->lock
);
325 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
326 assigned_irq
->assigned_dev_id
);
328 mutex_unlock(&kvm
->lock
);
332 if (!match
->irq_requested_type
) {
333 INIT_WORK(&match
->interrupt_work
,
334 kvm_assigned_dev_interrupt_work_handler
);
335 if (irqchip_in_kernel(kvm
)) {
336 /* Register ack nofitier */
337 match
->ack_notifier
.gsi
= -1;
338 match
->ack_notifier
.irq_acked
=
339 kvm_assigned_dev_ack_irq
;
340 kvm_register_irq_ack_notifier(kvm
,
341 &match
->ack_notifier
);
343 /* Request IRQ source ID */
344 r
= kvm_request_irq_source_id(kvm
);
348 match
->irq_source_id
= r
;
352 if (assigned_irq
->flags
& KVM_DEV_IRQ_ASSIGN_ENABLE_MSI
) {
354 r
= assigned_device_update_msi(kvm
, match
, assigned_irq
);
356 printk(KERN_WARNING
"kvm: failed to enable "
363 } else if (assigned_irq
->host_irq
== 0 && match
->dev
->irq
== 0) {
364 /* Host device IRQ 0 means don't support INTx */
365 printk(KERN_WARNING
"kvm: wait device to enable MSI!\n");
368 /* Non-sharing INTx mode */
369 r
= assigned_device_update_intx(kvm
, match
, assigned_irq
);
371 printk(KERN_WARNING
"kvm: failed to enable "
377 mutex_unlock(&kvm
->lock
);
380 mutex_unlock(&kvm
->lock
);
381 kvm_free_assigned_device(kvm
, match
);
385 static int kvm_vm_ioctl_assign_device(struct kvm
*kvm
,
386 struct kvm_assigned_pci_dev
*assigned_dev
)
389 struct kvm_assigned_dev_kernel
*match
;
392 mutex_lock(&kvm
->lock
);
394 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
395 assigned_dev
->assigned_dev_id
);
397 /* device already assigned */
402 match
= kzalloc(sizeof(struct kvm_assigned_dev_kernel
), GFP_KERNEL
);
404 printk(KERN_INFO
"%s: Couldn't allocate memory\n",
409 dev
= pci_get_bus_and_slot(assigned_dev
->busnr
,
410 assigned_dev
->devfn
);
412 printk(KERN_INFO
"%s: host device not found\n", __func__
);
416 if (pci_enable_device(dev
)) {
417 printk(KERN_INFO
"%s: Could not enable PCI device\n", __func__
);
421 r
= pci_request_regions(dev
, "kvm_assigned_device");
423 printk(KERN_INFO
"%s: Could not get access to device regions\n",
428 pci_reset_function(dev
);
430 match
->assigned_dev_id
= assigned_dev
->assigned_dev_id
;
431 match
->host_busnr
= assigned_dev
->busnr
;
432 match
->host_devfn
= assigned_dev
->devfn
;
437 list_add(&match
->list
, &kvm
->arch
.assigned_dev_head
);
439 if (assigned_dev
->flags
& KVM_DEV_ASSIGN_ENABLE_IOMMU
) {
440 r
= kvm_iommu_map_guest(kvm
, match
);
446 mutex_unlock(&kvm
->lock
);
449 list_del(&match
->list
);
450 pci_release_regions(dev
);
452 pci_disable_device(dev
);
457 mutex_unlock(&kvm
->lock
);
462 static inline int valid_vcpu(int n
)
464 return likely(n
>= 0 && n
< KVM_MAX_VCPUS
);
467 inline int kvm_is_mmio_pfn(pfn_t pfn
)
470 return PageReserved(pfn_to_page(pfn
));
476 * Switches to specified vcpu, until a matching vcpu_put()
478 void vcpu_load(struct kvm_vcpu
*vcpu
)
482 mutex_lock(&vcpu
->mutex
);
484 preempt_notifier_register(&vcpu
->preempt_notifier
);
485 kvm_arch_vcpu_load(vcpu
, cpu
);
489 void vcpu_put(struct kvm_vcpu
*vcpu
)
492 kvm_arch_vcpu_put(vcpu
);
493 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
495 mutex_unlock(&vcpu
->mutex
);
498 static void ack_flush(void *_completed
)
502 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
506 struct kvm_vcpu
*vcpu
;
510 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
511 vcpu
= kvm
->vcpus
[i
];
514 if (test_and_set_bit(KVM_REQ_TLB_FLUSH
, &vcpu
->requests
))
517 if (cpu
!= -1 && cpu
!= me
)
520 if (cpus_empty(cpus
))
522 ++kvm
->stat
.remote_tlb_flush
;
523 smp_call_function_mask(cpus
, ack_flush
, NULL
, 1);
528 void kvm_reload_remote_mmus(struct kvm
*kvm
)
532 struct kvm_vcpu
*vcpu
;
536 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
537 vcpu
= kvm
->vcpus
[i
];
540 if (test_and_set_bit(KVM_REQ_MMU_RELOAD
, &vcpu
->requests
))
543 if (cpu
!= -1 && cpu
!= me
)
546 if (cpus_empty(cpus
))
548 smp_call_function_mask(cpus
, ack_flush
, NULL
, 1);
554 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
559 mutex_init(&vcpu
->mutex
);
563 init_waitqueue_head(&vcpu
->wq
);
565 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
570 vcpu
->run
= page_address(page
);
572 r
= kvm_arch_vcpu_init(vcpu
);
578 free_page((unsigned long)vcpu
->run
);
582 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
584 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
586 kvm_arch_vcpu_uninit(vcpu
);
587 free_page((unsigned long)vcpu
->run
);
589 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
591 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
592 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
594 return container_of(mn
, struct kvm
, mmu_notifier
);
597 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
598 struct mm_struct
*mm
,
599 unsigned long address
)
601 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
605 * When ->invalidate_page runs, the linux pte has been zapped
606 * already but the page is still allocated until
607 * ->invalidate_page returns. So if we increase the sequence
608 * here the kvm page fault will notice if the spte can't be
609 * established because the page is going to be freed. If
610 * instead the kvm page fault establishes the spte before
611 * ->invalidate_page runs, kvm_unmap_hva will release it
614 * The sequence increase only need to be seen at spin_unlock
615 * time, and not at spin_lock time.
617 * Increasing the sequence after the spin_unlock would be
618 * unsafe because the kvm page fault could then establish the
619 * pte after kvm_unmap_hva returned, without noticing the page
620 * is going to be freed.
622 spin_lock(&kvm
->mmu_lock
);
623 kvm
->mmu_notifier_seq
++;
624 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
625 spin_unlock(&kvm
->mmu_lock
);
627 /* we've to flush the tlb before the pages can be freed */
629 kvm_flush_remote_tlbs(kvm
);
633 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
634 struct mm_struct
*mm
,
638 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
639 int need_tlb_flush
= 0;
641 spin_lock(&kvm
->mmu_lock
);
643 * The count increase must become visible at unlock time as no
644 * spte can be established without taking the mmu_lock and
645 * count is also read inside the mmu_lock critical section.
647 kvm
->mmu_notifier_count
++;
648 for (; start
< end
; start
+= PAGE_SIZE
)
649 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
650 spin_unlock(&kvm
->mmu_lock
);
652 /* we've to flush the tlb before the pages can be freed */
654 kvm_flush_remote_tlbs(kvm
);
657 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
658 struct mm_struct
*mm
,
662 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
664 spin_lock(&kvm
->mmu_lock
);
666 * This sequence increase will notify the kvm page fault that
667 * the page that is going to be mapped in the spte could have
670 kvm
->mmu_notifier_seq
++;
672 * The above sequence increase must be visible before the
673 * below count decrease but both values are read by the kvm
674 * page fault under mmu_lock spinlock so we don't need to add
675 * a smb_wmb() here in between the two.
677 kvm
->mmu_notifier_count
--;
678 spin_unlock(&kvm
->mmu_lock
);
680 BUG_ON(kvm
->mmu_notifier_count
< 0);
683 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
684 struct mm_struct
*mm
,
685 unsigned long address
)
687 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
690 spin_lock(&kvm
->mmu_lock
);
691 young
= kvm_age_hva(kvm
, address
);
692 spin_unlock(&kvm
->mmu_lock
);
695 kvm_flush_remote_tlbs(kvm
);
700 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
701 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
702 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
703 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
704 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
706 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
708 static struct kvm
*kvm_create_vm(void)
710 struct kvm
*kvm
= kvm_arch_create_vm();
711 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
718 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
719 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
722 return ERR_PTR(-ENOMEM
);
724 kvm
->coalesced_mmio_ring
=
725 (struct kvm_coalesced_mmio_ring
*)page_address(page
);
728 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
731 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
732 err
= mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
734 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
743 kvm
->mm
= current
->mm
;
744 atomic_inc(&kvm
->mm
->mm_count
);
745 spin_lock_init(&kvm
->mmu_lock
);
746 kvm_io_bus_init(&kvm
->pio_bus
);
747 mutex_init(&kvm
->lock
);
748 kvm_io_bus_init(&kvm
->mmio_bus
);
749 init_rwsem(&kvm
->slots_lock
);
750 atomic_set(&kvm
->users_count
, 1);
751 spin_lock(&kvm_lock
);
752 list_add(&kvm
->vm_list
, &vm_list
);
753 spin_unlock(&kvm_lock
);
754 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
755 kvm_coalesced_mmio_init(kvm
);
762 * Free any memory in @free but not in @dont.
764 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
765 struct kvm_memory_slot
*dont
)
767 if (!dont
|| free
->rmap
!= dont
->rmap
)
770 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
771 vfree(free
->dirty_bitmap
);
773 if (!dont
|| free
->lpage_info
!= dont
->lpage_info
)
774 vfree(free
->lpage_info
);
777 free
->dirty_bitmap
= NULL
;
779 free
->lpage_info
= NULL
;
782 void kvm_free_physmem(struct kvm
*kvm
)
786 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
787 kvm_free_physmem_slot(&kvm
->memslots
[i
], NULL
);
790 static void kvm_destroy_vm(struct kvm
*kvm
)
792 struct mm_struct
*mm
= kvm
->mm
;
794 spin_lock(&kvm_lock
);
795 list_del(&kvm
->vm_list
);
796 spin_unlock(&kvm_lock
);
797 kvm_io_bus_destroy(&kvm
->pio_bus
);
798 kvm_io_bus_destroy(&kvm
->mmio_bus
);
799 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
800 if (kvm
->coalesced_mmio_ring
!= NULL
)
801 free_page((unsigned long)kvm
->coalesced_mmio_ring
);
803 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
804 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
806 kvm_arch_destroy_vm(kvm
);
810 void kvm_get_kvm(struct kvm
*kvm
)
812 atomic_inc(&kvm
->users_count
);
814 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
816 void kvm_put_kvm(struct kvm
*kvm
)
818 if (atomic_dec_and_test(&kvm
->users_count
))
821 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
824 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
826 struct kvm
*kvm
= filp
->private_data
;
833 * Allocate some memory and give it an address in the guest physical address
836 * Discontiguous memory is allowed, mostly for framebuffers.
838 * Must be called holding mmap_sem for write.
840 int __kvm_set_memory_region(struct kvm
*kvm
,
841 struct kvm_userspace_memory_region
*mem
,
846 unsigned long npages
;
848 struct kvm_memory_slot
*memslot
;
849 struct kvm_memory_slot old
, new;
852 /* General sanity checks */
853 if (mem
->memory_size
& (PAGE_SIZE
- 1))
855 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
857 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
859 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
861 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
864 memslot
= &kvm
->memslots
[mem
->slot
];
865 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
866 npages
= mem
->memory_size
>> PAGE_SHIFT
;
869 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
871 new = old
= *memslot
;
873 new.base_gfn
= base_gfn
;
875 new.flags
= mem
->flags
;
877 /* Disallow changing a memory slot's size. */
879 if (npages
&& old
.npages
&& npages
!= old
.npages
)
882 /* Check for overlaps */
884 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
885 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
889 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
890 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
894 /* Free page dirty bitmap if unneeded */
895 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
896 new.dirty_bitmap
= NULL
;
900 /* Allocate if a slot is being created */
902 if (npages
&& !new.rmap
) {
903 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
908 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
910 new.user_alloc
= user_alloc
;
912 * hva_to_rmmap() serialzies with the mmu_lock and to be
913 * safe it has to ignore memslots with !user_alloc &&
917 new.userspace_addr
= mem
->userspace_addr
;
919 new.userspace_addr
= 0;
921 if (npages
&& !new.lpage_info
) {
922 int largepages
= npages
/ KVM_PAGES_PER_HPAGE
;
923 if (npages
% KVM_PAGES_PER_HPAGE
)
925 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
928 new.lpage_info
= vmalloc(largepages
* sizeof(*new.lpage_info
));
933 memset(new.lpage_info
, 0, largepages
* sizeof(*new.lpage_info
));
935 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
936 new.lpage_info
[0].write_count
= 1;
937 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE
)
938 new.lpage_info
[largepages
-1].write_count
= 1;
941 /* Allocate page dirty bitmap if needed */
942 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
943 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
945 new.dirty_bitmap
= vmalloc(dirty_bytes
);
946 if (!new.dirty_bitmap
)
948 memset(new.dirty_bitmap
, 0, dirty_bytes
);
950 #endif /* not defined CONFIG_S390 */
953 kvm_arch_flush_shadow(kvm
);
955 spin_lock(&kvm
->mmu_lock
);
956 if (mem
->slot
>= kvm
->nmemslots
)
957 kvm
->nmemslots
= mem
->slot
+ 1;
960 spin_unlock(&kvm
->mmu_lock
);
962 r
= kvm_arch_set_memory_region(kvm
, mem
, old
, user_alloc
);
964 spin_lock(&kvm
->mmu_lock
);
966 spin_unlock(&kvm
->mmu_lock
);
970 kvm_free_physmem_slot(&old
, &new);
972 /* map the pages in iommu page table */
973 r
= kvm_iommu_map_pages(kvm
, base_gfn
, npages
);
980 kvm_free_physmem_slot(&new, &old
);
985 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
987 int kvm_set_memory_region(struct kvm
*kvm
,
988 struct kvm_userspace_memory_region
*mem
,
993 down_write(&kvm
->slots_lock
);
994 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
995 up_write(&kvm
->slots_lock
);
998 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1000 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1002 kvm_userspace_memory_region
*mem
,
1005 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
1007 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
1010 int kvm_get_dirty_log(struct kvm
*kvm
,
1011 struct kvm_dirty_log
*log
, int *is_dirty
)
1013 struct kvm_memory_slot
*memslot
;
1016 unsigned long any
= 0;
1019 if (log
->slot
>= KVM_MEMORY_SLOTS
)
1022 memslot
= &kvm
->memslots
[log
->slot
];
1024 if (!memslot
->dirty_bitmap
)
1027 n
= ALIGN(memslot
->npages
, BITS_PER_LONG
) / 8;
1029 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1030 any
= memslot
->dirty_bitmap
[i
];
1033 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1044 int is_error_page(struct page
*page
)
1046 return page
== bad_page
;
1048 EXPORT_SYMBOL_GPL(is_error_page
);
1050 int is_error_pfn(pfn_t pfn
)
1052 return pfn
== bad_pfn
;
1054 EXPORT_SYMBOL_GPL(is_error_pfn
);
1056 static inline unsigned long bad_hva(void)
1061 int kvm_is_error_hva(unsigned long addr
)
1063 return addr
== bad_hva();
1065 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
1067 struct kvm_memory_slot
*gfn_to_memslot_unaliased(struct kvm
*kvm
, gfn_t gfn
)
1071 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
1072 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
1074 if (gfn
>= memslot
->base_gfn
1075 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1080 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased
);
1082 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1084 gfn
= unalias_gfn(kvm
, gfn
);
1085 return gfn_to_memslot_unaliased(kvm
, gfn
);
1088 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1092 gfn
= unalias_gfn(kvm
, gfn
);
1093 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1094 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
1096 if (gfn
>= memslot
->base_gfn
1097 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1102 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1104 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1106 struct kvm_memory_slot
*slot
;
1108 gfn
= unalias_gfn(kvm
, gfn
);
1109 slot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1112 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
1114 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1116 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1118 struct page
*page
[1];
1125 addr
= gfn_to_hva(kvm
, gfn
);
1126 if (kvm_is_error_hva(addr
)) {
1128 return page_to_pfn(bad_page
);
1131 npages
= get_user_pages_fast(addr
, 1, 1, page
);
1133 if (unlikely(npages
!= 1)) {
1134 struct vm_area_struct
*vma
;
1136 down_read(¤t
->mm
->mmap_sem
);
1137 vma
= find_vma(current
->mm
, addr
);
1139 if (vma
== NULL
|| addr
< vma
->vm_start
||
1140 !(vma
->vm_flags
& VM_PFNMAP
)) {
1141 up_read(¤t
->mm
->mmap_sem
);
1143 return page_to_pfn(bad_page
);
1146 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
1147 up_read(¤t
->mm
->mmap_sem
);
1148 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1150 pfn
= page_to_pfn(page
[0]);
1155 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1157 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1161 pfn
= gfn_to_pfn(kvm
, gfn
);
1162 if (!kvm_is_mmio_pfn(pfn
))
1163 return pfn_to_page(pfn
);
1165 WARN_ON(kvm_is_mmio_pfn(pfn
));
1171 EXPORT_SYMBOL_GPL(gfn_to_page
);
1173 void kvm_release_page_clean(struct page
*page
)
1175 kvm_release_pfn_clean(page_to_pfn(page
));
1177 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1179 void kvm_release_pfn_clean(pfn_t pfn
)
1181 if (!kvm_is_mmio_pfn(pfn
))
1182 put_page(pfn_to_page(pfn
));
1184 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1186 void kvm_release_page_dirty(struct page
*page
)
1188 kvm_release_pfn_dirty(page_to_pfn(page
));
1190 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1192 void kvm_release_pfn_dirty(pfn_t pfn
)
1194 kvm_set_pfn_dirty(pfn
);
1195 kvm_release_pfn_clean(pfn
);
1197 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1199 void kvm_set_page_dirty(struct page
*page
)
1201 kvm_set_pfn_dirty(page_to_pfn(page
));
1203 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1205 void kvm_set_pfn_dirty(pfn_t pfn
)
1207 if (!kvm_is_mmio_pfn(pfn
)) {
1208 struct page
*page
= pfn_to_page(pfn
);
1209 if (!PageReserved(page
))
1213 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1215 void kvm_set_pfn_accessed(pfn_t pfn
)
1217 if (!kvm_is_mmio_pfn(pfn
))
1218 mark_page_accessed(pfn_to_page(pfn
));
1220 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1222 void kvm_get_pfn(pfn_t pfn
)
1224 if (!kvm_is_mmio_pfn(pfn
))
1225 get_page(pfn_to_page(pfn
));
1227 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1229 static int next_segment(unsigned long len
, int offset
)
1231 if (len
> PAGE_SIZE
- offset
)
1232 return PAGE_SIZE
- offset
;
1237 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1243 addr
= gfn_to_hva(kvm
, gfn
);
1244 if (kvm_is_error_hva(addr
))
1246 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1251 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1253 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1255 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1257 int offset
= offset_in_page(gpa
);
1260 while ((seg
= next_segment(len
, offset
)) != 0) {
1261 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1271 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1273 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1278 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1279 int offset
= offset_in_page(gpa
);
1281 addr
= gfn_to_hva(kvm
, gfn
);
1282 if (kvm_is_error_hva(addr
))
1284 pagefault_disable();
1285 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1291 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1293 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1294 int offset
, int len
)
1299 addr
= gfn_to_hva(kvm
, gfn
);
1300 if (kvm_is_error_hva(addr
))
1302 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1305 mark_page_dirty(kvm
, gfn
);
1308 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1310 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1313 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1315 int offset
= offset_in_page(gpa
);
1318 while ((seg
= next_segment(len
, offset
)) != 0) {
1319 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1330 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1332 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1334 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1336 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1338 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1340 int offset
= offset_in_page(gpa
);
1343 while ((seg
= next_segment(len
, offset
)) != 0) {
1344 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1353 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1355 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1357 struct kvm_memory_slot
*memslot
;
1359 gfn
= unalias_gfn(kvm
, gfn
);
1360 memslot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1361 if (memslot
&& memslot
->dirty_bitmap
) {
1362 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1365 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
1366 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
1371 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1373 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1378 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1380 if (kvm_cpu_has_interrupt(vcpu
) ||
1381 kvm_cpu_has_pending_timer(vcpu
) ||
1382 kvm_arch_vcpu_runnable(vcpu
)) {
1383 set_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
1386 if (signal_pending(current
))
1394 finish_wait(&vcpu
->wq
, &wait
);
1397 void kvm_resched(struct kvm_vcpu
*vcpu
)
1399 if (!need_resched())
1403 EXPORT_SYMBOL_GPL(kvm_resched
);
1405 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1407 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1410 if (vmf
->pgoff
== 0)
1411 page
= virt_to_page(vcpu
->run
);
1413 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1414 page
= virt_to_page(vcpu
->arch
.pio_data
);
1416 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1417 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1418 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1421 return VM_FAULT_SIGBUS
;
1427 static struct vm_operations_struct kvm_vcpu_vm_ops
= {
1428 .fault
= kvm_vcpu_fault
,
1431 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1433 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1437 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1439 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1441 kvm_put_kvm(vcpu
->kvm
);
1445 static const struct file_operations kvm_vcpu_fops
= {
1446 .release
= kvm_vcpu_release
,
1447 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1448 .compat_ioctl
= kvm_vcpu_ioctl
,
1449 .mmap
= kvm_vcpu_mmap
,
1453 * Allocates an inode for the vcpu.
1455 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1457 int fd
= anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, 0);
1459 kvm_put_kvm(vcpu
->kvm
);
1464 * Creates some virtual cpus. Good luck creating more than one.
1466 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
1469 struct kvm_vcpu
*vcpu
;
1474 vcpu
= kvm_arch_vcpu_create(kvm
, n
);
1476 return PTR_ERR(vcpu
);
1478 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1480 r
= kvm_arch_vcpu_setup(vcpu
);
1484 mutex_lock(&kvm
->lock
);
1485 if (kvm
->vcpus
[n
]) {
1489 kvm
->vcpus
[n
] = vcpu
;
1490 mutex_unlock(&kvm
->lock
);
1492 /* Now it's all set up, let userspace reach it */
1494 r
= create_vcpu_fd(vcpu
);
1500 mutex_lock(&kvm
->lock
);
1501 kvm
->vcpus
[n
] = NULL
;
1503 mutex_unlock(&kvm
->lock
);
1504 kvm_arch_vcpu_destroy(vcpu
);
1508 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1511 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1512 vcpu
->sigset_active
= 1;
1513 vcpu
->sigset
= *sigset
;
1515 vcpu
->sigset_active
= 0;
1519 static long kvm_vcpu_ioctl(struct file
*filp
,
1520 unsigned int ioctl
, unsigned long arg
)
1522 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1523 void __user
*argp
= (void __user
*)arg
;
1525 struct kvm_fpu
*fpu
= NULL
;
1526 struct kvm_sregs
*kvm_sregs
= NULL
;
1528 if (vcpu
->kvm
->mm
!= current
->mm
)
1535 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1537 case KVM_GET_REGS
: {
1538 struct kvm_regs
*kvm_regs
;
1541 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1544 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1548 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1555 case KVM_SET_REGS
: {
1556 struct kvm_regs
*kvm_regs
;
1559 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1563 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1565 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1573 case KVM_GET_SREGS
: {
1574 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1578 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1582 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1587 case KVM_SET_SREGS
: {
1588 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1593 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1595 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1601 case KVM_GET_MP_STATE
: {
1602 struct kvm_mp_state mp_state
;
1604 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1608 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1613 case KVM_SET_MP_STATE
: {
1614 struct kvm_mp_state mp_state
;
1617 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1619 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1625 case KVM_TRANSLATE
: {
1626 struct kvm_translation tr
;
1629 if (copy_from_user(&tr
, argp
, sizeof tr
))
1631 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1635 if (copy_to_user(argp
, &tr
, sizeof tr
))
1640 case KVM_DEBUG_GUEST
: {
1641 struct kvm_debug_guest dbg
;
1644 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1646 r
= kvm_arch_vcpu_ioctl_debug_guest(vcpu
, &dbg
);
1652 case KVM_SET_SIGNAL_MASK
: {
1653 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1654 struct kvm_signal_mask kvm_sigmask
;
1655 sigset_t sigset
, *p
;
1660 if (copy_from_user(&kvm_sigmask
, argp
,
1661 sizeof kvm_sigmask
))
1664 if (kvm_sigmask
.len
!= sizeof sigset
)
1667 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1672 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1676 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1680 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1684 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1690 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1695 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
1697 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1704 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1712 static long kvm_vm_ioctl(struct file
*filp
,
1713 unsigned int ioctl
, unsigned long arg
)
1715 struct kvm
*kvm
= filp
->private_data
;
1716 void __user
*argp
= (void __user
*)arg
;
1719 if (kvm
->mm
!= current
->mm
)
1722 case KVM_CREATE_VCPU
:
1723 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1727 case KVM_SET_USER_MEMORY_REGION
: {
1728 struct kvm_userspace_memory_region kvm_userspace_mem
;
1731 if (copy_from_user(&kvm_userspace_mem
, argp
,
1732 sizeof kvm_userspace_mem
))
1735 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
1740 case KVM_GET_DIRTY_LOG
: {
1741 struct kvm_dirty_log log
;
1744 if (copy_from_user(&log
, argp
, sizeof log
))
1746 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1751 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1752 case KVM_REGISTER_COALESCED_MMIO
: {
1753 struct kvm_coalesced_mmio_zone zone
;
1755 if (copy_from_user(&zone
, argp
, sizeof zone
))
1758 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
1764 case KVM_UNREGISTER_COALESCED_MMIO
: {
1765 struct kvm_coalesced_mmio_zone zone
;
1767 if (copy_from_user(&zone
, argp
, sizeof zone
))
1770 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
1777 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
1778 case KVM_ASSIGN_PCI_DEVICE
: {
1779 struct kvm_assigned_pci_dev assigned_dev
;
1782 if (copy_from_user(&assigned_dev
, argp
, sizeof assigned_dev
))
1784 r
= kvm_vm_ioctl_assign_device(kvm
, &assigned_dev
);
1789 case KVM_ASSIGN_IRQ
: {
1790 struct kvm_assigned_irq assigned_irq
;
1793 if (copy_from_user(&assigned_irq
, argp
, sizeof assigned_irq
))
1795 r
= kvm_vm_ioctl_assign_irq(kvm
, &assigned_irq
);
1802 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
1808 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1810 struct page
*page
[1];
1813 gfn_t gfn
= vmf
->pgoff
;
1814 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1816 addr
= gfn_to_hva(kvm
, gfn
);
1817 if (kvm_is_error_hva(addr
))
1818 return VM_FAULT_SIGBUS
;
1820 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
1822 if (unlikely(npages
!= 1))
1823 return VM_FAULT_SIGBUS
;
1825 vmf
->page
= page
[0];
1829 static struct vm_operations_struct kvm_vm_vm_ops
= {
1830 .fault
= kvm_vm_fault
,
1833 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1835 vma
->vm_ops
= &kvm_vm_vm_ops
;
1839 static const struct file_operations kvm_vm_fops
= {
1840 .release
= kvm_vm_release
,
1841 .unlocked_ioctl
= kvm_vm_ioctl
,
1842 .compat_ioctl
= kvm_vm_ioctl
,
1843 .mmap
= kvm_vm_mmap
,
1846 static int kvm_dev_ioctl_create_vm(void)
1851 kvm
= kvm_create_vm();
1853 return PTR_ERR(kvm
);
1854 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, 0);
1861 static long kvm_dev_ioctl(struct file
*filp
,
1862 unsigned int ioctl
, unsigned long arg
)
1867 case KVM_GET_API_VERSION
:
1871 r
= KVM_API_VERSION
;
1877 r
= kvm_dev_ioctl_create_vm();
1879 case KVM_CHECK_EXTENSION
:
1880 r
= kvm_dev_ioctl_check_extension(arg
);
1882 case KVM_GET_VCPU_MMAP_SIZE
:
1886 r
= PAGE_SIZE
; /* struct kvm_run */
1888 r
+= PAGE_SIZE
; /* pio data page */
1890 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1891 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
1894 case KVM_TRACE_ENABLE
:
1895 case KVM_TRACE_PAUSE
:
1896 case KVM_TRACE_DISABLE
:
1897 r
= kvm_trace_ioctl(ioctl
, arg
);
1900 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
1906 static struct file_operations kvm_chardev_ops
= {
1907 .unlocked_ioctl
= kvm_dev_ioctl
,
1908 .compat_ioctl
= kvm_dev_ioctl
,
1911 static struct miscdevice kvm_dev
= {
1917 static void hardware_enable(void *junk
)
1919 int cpu
= raw_smp_processor_id();
1921 if (cpu_isset(cpu
, cpus_hardware_enabled
))
1923 cpu_set(cpu
, cpus_hardware_enabled
);
1924 kvm_arch_hardware_enable(NULL
);
1927 static void hardware_disable(void *junk
)
1929 int cpu
= raw_smp_processor_id();
1931 if (!cpu_isset(cpu
, cpus_hardware_enabled
))
1933 cpu_clear(cpu
, cpus_hardware_enabled
);
1934 kvm_arch_hardware_disable(NULL
);
1937 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
1942 val
&= ~CPU_TASKS_FROZEN
;
1945 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1947 hardware_disable(NULL
);
1949 case CPU_UP_CANCELED
:
1950 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1952 smp_call_function_single(cpu
, hardware_disable
, NULL
, 1);
1955 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
1957 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
1964 asmlinkage
void kvm_handle_fault_on_reboot(void)
1967 /* spin while reset goes on */
1970 /* Fault while not rebooting. We want the trace. */
1973 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
1975 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1978 if (val
== SYS_RESTART
) {
1980 * Some (well, at least mine) BIOSes hang on reboot if
1983 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1984 kvm_rebooting
= true;
1985 on_each_cpu(hardware_disable
, NULL
, 1);
1990 static struct notifier_block kvm_reboot_notifier
= {
1991 .notifier_call
= kvm_reboot
,
1995 void kvm_io_bus_init(struct kvm_io_bus
*bus
)
1997 memset(bus
, 0, sizeof(*bus
));
2000 void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2004 for (i
= 0; i
< bus
->dev_count
; i
++) {
2005 struct kvm_io_device
*pos
= bus
->devs
[i
];
2007 kvm_iodevice_destructor(pos
);
2011 struct kvm_io_device
*kvm_io_bus_find_dev(struct kvm_io_bus
*bus
,
2012 gpa_t addr
, int len
, int is_write
)
2016 for (i
= 0; i
< bus
->dev_count
; i
++) {
2017 struct kvm_io_device
*pos
= bus
->devs
[i
];
2019 if (pos
->in_range(pos
, addr
, len
, is_write
))
2026 void kvm_io_bus_register_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
)
2028 BUG_ON(bus
->dev_count
> (NR_IOBUS_DEVS
-1));
2030 bus
->devs
[bus
->dev_count
++] = dev
;
2033 static struct notifier_block kvm_cpu_notifier
= {
2034 .notifier_call
= kvm_cpu_hotplug
,
2035 .priority
= 20, /* must be > scheduler priority */
2038 static int vm_stat_get(void *_offset
, u64
*val
)
2040 unsigned offset
= (long)_offset
;
2044 spin_lock(&kvm_lock
);
2045 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2046 *val
+= *(u32
*)((void *)kvm
+ offset
);
2047 spin_unlock(&kvm_lock
);
2051 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2053 static int vcpu_stat_get(void *_offset
, u64
*val
)
2055 unsigned offset
= (long)_offset
;
2057 struct kvm_vcpu
*vcpu
;
2061 spin_lock(&kvm_lock
);
2062 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2063 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
2064 vcpu
= kvm
->vcpus
[i
];
2066 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2068 spin_unlock(&kvm_lock
);
2072 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2074 static struct file_operations
*stat_fops
[] = {
2075 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2076 [KVM_STAT_VM
] = &vm_stat_fops
,
2079 static void kvm_init_debug(void)
2081 struct kvm_stats_debugfs_item
*p
;
2083 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2084 for (p
= debugfs_entries
; p
->name
; ++p
)
2085 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2086 (void *)(long)p
->offset
,
2087 stat_fops
[p
->kind
]);
2090 static void kvm_exit_debug(void)
2092 struct kvm_stats_debugfs_item
*p
;
2094 for (p
= debugfs_entries
; p
->name
; ++p
)
2095 debugfs_remove(p
->dentry
);
2096 debugfs_remove(kvm_debugfs_dir
);
2099 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2101 hardware_disable(NULL
);
2105 static int kvm_resume(struct sys_device
*dev
)
2107 hardware_enable(NULL
);
2111 static struct sysdev_class kvm_sysdev_class
= {
2113 .suspend
= kvm_suspend
,
2114 .resume
= kvm_resume
,
2117 static struct sys_device kvm_sysdev
= {
2119 .cls
= &kvm_sysdev_class
,
2122 struct page
*bad_page
;
2126 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2128 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2131 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2133 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2135 kvm_arch_vcpu_load(vcpu
, cpu
);
2138 static void kvm_sched_out(struct preempt_notifier
*pn
,
2139 struct task_struct
*next
)
2141 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2143 kvm_arch_vcpu_put(vcpu
);
2146 int kvm_init(void *opaque
, unsigned int vcpu_size
,
2147 struct module
*module
)
2154 r
= kvm_arch_init(opaque
);
2158 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2160 if (bad_page
== NULL
) {
2165 bad_pfn
= page_to_pfn(bad_page
);
2167 r
= kvm_arch_hardware_setup();
2171 for_each_online_cpu(cpu
) {
2172 smp_call_function_single(cpu
,
2173 kvm_arch_check_processor_compat
,
2179 on_each_cpu(hardware_enable
, NULL
, 1);
2180 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2183 register_reboot_notifier(&kvm_reboot_notifier
);
2185 r
= sysdev_class_register(&kvm_sysdev_class
);
2189 r
= sysdev_register(&kvm_sysdev
);
2193 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2194 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
,
2195 __alignof__(struct kvm_vcpu
),
2197 if (!kvm_vcpu_cache
) {
2202 kvm_chardev_ops
.owner
= module
;
2204 r
= misc_register(&kvm_dev
);
2206 printk(KERN_ERR
"kvm: misc device register failed\n");
2210 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2211 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2216 kmem_cache_destroy(kvm_vcpu_cache
);
2218 sysdev_unregister(&kvm_sysdev
);
2220 sysdev_class_unregister(&kvm_sysdev_class
);
2222 unregister_reboot_notifier(&kvm_reboot_notifier
);
2223 unregister_cpu_notifier(&kvm_cpu_notifier
);
2225 on_each_cpu(hardware_disable
, NULL
, 1);
2227 kvm_arch_hardware_unsetup();
2229 __free_page(bad_page
);
2236 EXPORT_SYMBOL_GPL(kvm_init
);
2240 kvm_trace_cleanup();
2241 misc_deregister(&kvm_dev
);
2242 kmem_cache_destroy(kvm_vcpu_cache
);
2243 sysdev_unregister(&kvm_sysdev
);
2244 sysdev_class_unregister(&kvm_sysdev_class
);
2245 unregister_reboot_notifier(&kvm_reboot_notifier
);
2246 unregister_cpu_notifier(&kvm_cpu_notifier
);
2247 on_each_cpu(hardware_disable
, NULL
, 1);
2248 kvm_arch_hardware_unsetup();
2251 __free_page(bad_page
);
2253 EXPORT_SYMBOL_GPL(kvm_exit
);