2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/sysdev.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
45 #include <asm/processor.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
50 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
51 #include "coalesced_mmio.h"
54 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
55 #include <linux/pci.h>
56 #include <linux/interrupt.h>
60 MODULE_AUTHOR("Qumranet");
61 MODULE_LICENSE("GPL");
63 DEFINE_SPINLOCK(kvm_lock
);
66 static cpumask_t cpus_hardware_enabled
;
68 struct kmem_cache
*kvm_vcpu_cache
;
69 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
71 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
73 struct dentry
*kvm_debugfs_dir
;
75 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
80 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
81 static struct kvm_assigned_dev_kernel
*kvm_find_assigned_dev(struct list_head
*head
,
84 struct list_head
*ptr
;
85 struct kvm_assigned_dev_kernel
*match
;
87 list_for_each(ptr
, head
) {
88 match
= list_entry(ptr
, struct kvm_assigned_dev_kernel
, list
);
89 if (match
->assigned_dev_id
== assigned_dev_id
)
95 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct
*work
)
97 struct kvm_assigned_dev_kernel
*assigned_dev
;
99 assigned_dev
= container_of(work
, struct kvm_assigned_dev_kernel
,
102 /* This is taken to safely inject irq inside the guest. When
103 * the interrupt injection (or the ioapic code) uses a
104 * finer-grained lock, update this
106 mutex_lock(&assigned_dev
->kvm
->lock
);
107 kvm_set_irq(assigned_dev
->kvm
,
108 assigned_dev
->irq_source_id
,
109 assigned_dev
->guest_irq
, 1);
110 mutex_unlock(&assigned_dev
->kvm
->lock
);
111 kvm_put_kvm(assigned_dev
->kvm
);
114 static irqreturn_t
kvm_assigned_dev_intr(int irq
, void *dev_id
)
116 struct kvm_assigned_dev_kernel
*assigned_dev
=
117 (struct kvm_assigned_dev_kernel
*) dev_id
;
119 kvm_get_kvm(assigned_dev
->kvm
);
120 schedule_work(&assigned_dev
->interrupt_work
);
121 disable_irq_nosync(irq
);
125 /* Ack the irq line for an assigned device */
126 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier
*kian
)
128 struct kvm_assigned_dev_kernel
*dev
;
133 dev
= container_of(kian
, struct kvm_assigned_dev_kernel
,
135 kvm_set_irq(dev
->kvm
, dev
->irq_source_id
, dev
->guest_irq
, 0);
136 enable_irq(dev
->host_irq
);
139 static void kvm_free_assigned_device(struct kvm
*kvm
,
140 struct kvm_assigned_dev_kernel
143 if (irqchip_in_kernel(kvm
) && assigned_dev
->irq_requested_type
)
144 free_irq(assigned_dev
->host_irq
, (void *)assigned_dev
);
146 kvm_unregister_irq_ack_notifier(&assigned_dev
->ack_notifier
);
147 kvm_free_irq_source_id(kvm
, assigned_dev
->irq_source_id
);
149 if (cancel_work_sync(&assigned_dev
->interrupt_work
))
150 /* We had pending work. That means we will have to take
151 * care of kvm_put_kvm.
155 pci_reset_function(assigned_dev
->dev
);
157 pci_release_regions(assigned_dev
->dev
);
158 pci_disable_device(assigned_dev
->dev
);
159 pci_dev_put(assigned_dev
->dev
);
161 list_del(&assigned_dev
->list
);
165 void kvm_free_all_assigned_devices(struct kvm
*kvm
)
167 struct list_head
*ptr
, *ptr2
;
168 struct kvm_assigned_dev_kernel
*assigned_dev
;
170 list_for_each_safe(ptr
, ptr2
, &kvm
->arch
.assigned_dev_head
) {
171 assigned_dev
= list_entry(ptr
,
172 struct kvm_assigned_dev_kernel
,
175 kvm_free_assigned_device(kvm
, assigned_dev
);
179 static int assigned_device_update_intx(struct kvm
*kvm
,
180 struct kvm_assigned_dev_kernel
*adev
,
181 struct kvm_assigned_irq
*airq
)
183 if (adev
->irq_requested_type
& KVM_ASSIGNED_DEV_GUEST_INTX
) {
184 adev
->guest_irq
= airq
->guest_irq
;
185 adev
->ack_notifier
.gsi
= airq
->guest_irq
;
189 if (irqchip_in_kernel(kvm
)) {
190 if (!capable(CAP_SYS_RAWIO
))
194 adev
->host_irq
= airq
->host_irq
;
196 adev
->host_irq
= adev
->dev
->irq
;
197 adev
->guest_irq
= airq
->guest_irq
;
198 adev
->ack_notifier
.gsi
= airq
->guest_irq
;
200 /* Even though this is PCI, we don't want to use shared
201 * interrupts. Sharing host devices with guest-assigned devices
202 * on the same interrupt line is not a happy situation: there
203 * are going to be long delays in accepting, acking, etc.
205 if (request_irq(adev
->host_irq
, kvm_assigned_dev_intr
,
206 0, "kvm_assigned_intx_device", (void *)adev
))
210 adev
->irq_requested_type
= KVM_ASSIGNED_DEV_GUEST_INTX
|
211 KVM_ASSIGNED_DEV_HOST_INTX
;
215 static int kvm_vm_ioctl_assign_irq(struct kvm
*kvm
,
216 struct kvm_assigned_irq
220 struct kvm_assigned_dev_kernel
*match
;
222 mutex_lock(&kvm
->lock
);
224 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
225 assigned_irq
->assigned_dev_id
);
227 mutex_unlock(&kvm
->lock
);
231 if (!match
->irq_requested_type
) {
232 INIT_WORK(&match
->interrupt_work
,
233 kvm_assigned_dev_interrupt_work_handler
);
234 if (irqchip_in_kernel(kvm
)) {
235 /* Register ack nofitier */
236 match
->ack_notifier
.gsi
= -1;
237 match
->ack_notifier
.irq_acked
=
238 kvm_assigned_dev_ack_irq
;
239 kvm_register_irq_ack_notifier(kvm
,
240 &match
->ack_notifier
);
242 /* Request IRQ source ID */
243 r
= kvm_request_irq_source_id(kvm
);
247 match
->irq_source_id
= r
;
251 r
= assigned_device_update_intx(kvm
, match
, assigned_irq
);
255 mutex_unlock(&kvm
->lock
);
258 mutex_unlock(&kvm
->lock
);
259 kvm_free_assigned_device(kvm
, match
);
263 static int kvm_vm_ioctl_assign_device(struct kvm
*kvm
,
264 struct kvm_assigned_pci_dev
*assigned_dev
)
267 struct kvm_assigned_dev_kernel
*match
;
270 mutex_lock(&kvm
->lock
);
272 match
= kvm_find_assigned_dev(&kvm
->arch
.assigned_dev_head
,
273 assigned_dev
->assigned_dev_id
);
275 /* device already assigned */
280 match
= kzalloc(sizeof(struct kvm_assigned_dev_kernel
), GFP_KERNEL
);
282 printk(KERN_INFO
"%s: Couldn't allocate memory\n",
287 dev
= pci_get_bus_and_slot(assigned_dev
->busnr
,
288 assigned_dev
->devfn
);
290 printk(KERN_INFO
"%s: host device not found\n", __func__
);
294 if (pci_enable_device(dev
)) {
295 printk(KERN_INFO
"%s: Could not enable PCI device\n", __func__
);
299 r
= pci_request_regions(dev
, "kvm_assigned_device");
301 printk(KERN_INFO
"%s: Could not get access to device regions\n",
306 pci_reset_function(dev
);
308 match
->assigned_dev_id
= assigned_dev
->assigned_dev_id
;
309 match
->host_busnr
= assigned_dev
->busnr
;
310 match
->host_devfn
= assigned_dev
->devfn
;
315 list_add(&match
->list
, &kvm
->arch
.assigned_dev_head
);
317 if (assigned_dev
->flags
& KVM_DEV_ASSIGN_ENABLE_IOMMU
) {
318 r
= kvm_iommu_map_guest(kvm
, match
);
324 mutex_unlock(&kvm
->lock
);
327 list_del(&match
->list
);
328 pci_release_regions(dev
);
330 pci_disable_device(dev
);
335 mutex_unlock(&kvm
->lock
);
340 static inline int valid_vcpu(int n
)
342 return likely(n
>= 0 && n
< KVM_MAX_VCPUS
);
345 inline int kvm_is_mmio_pfn(pfn_t pfn
)
348 return PageReserved(pfn_to_page(pfn
));
354 * Switches to specified vcpu, until a matching vcpu_put()
356 void vcpu_load(struct kvm_vcpu
*vcpu
)
360 mutex_lock(&vcpu
->mutex
);
362 preempt_notifier_register(&vcpu
->preempt_notifier
);
363 kvm_arch_vcpu_load(vcpu
, cpu
);
367 void vcpu_put(struct kvm_vcpu
*vcpu
)
370 kvm_arch_vcpu_put(vcpu
);
371 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
373 mutex_unlock(&vcpu
->mutex
);
376 static void ack_flush(void *_completed
)
380 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
384 struct kvm_vcpu
*vcpu
;
388 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
389 vcpu
= kvm
->vcpus
[i
];
392 if (test_and_set_bit(KVM_REQ_TLB_FLUSH
, &vcpu
->requests
))
395 if (cpu
!= -1 && cpu
!= me
)
398 if (cpus_empty(cpus
))
400 ++kvm
->stat
.remote_tlb_flush
;
401 smp_call_function_mask(cpus
, ack_flush
, NULL
, 1);
406 void kvm_reload_remote_mmus(struct kvm
*kvm
)
410 struct kvm_vcpu
*vcpu
;
414 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
415 vcpu
= kvm
->vcpus
[i
];
418 if (test_and_set_bit(KVM_REQ_MMU_RELOAD
, &vcpu
->requests
))
421 if (cpu
!= -1 && cpu
!= me
)
424 if (cpus_empty(cpus
))
426 smp_call_function_mask(cpus
, ack_flush
, NULL
, 1);
432 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
437 mutex_init(&vcpu
->mutex
);
441 init_waitqueue_head(&vcpu
->wq
);
443 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
448 vcpu
->run
= page_address(page
);
450 r
= kvm_arch_vcpu_init(vcpu
);
456 free_page((unsigned long)vcpu
->run
);
460 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
462 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
464 kvm_arch_vcpu_uninit(vcpu
);
465 free_page((unsigned long)vcpu
->run
);
467 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
469 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
470 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
472 return container_of(mn
, struct kvm
, mmu_notifier
);
475 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
476 struct mm_struct
*mm
,
477 unsigned long address
)
479 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
483 * When ->invalidate_page runs, the linux pte has been zapped
484 * already but the page is still allocated until
485 * ->invalidate_page returns. So if we increase the sequence
486 * here the kvm page fault will notice if the spte can't be
487 * established because the page is going to be freed. If
488 * instead the kvm page fault establishes the spte before
489 * ->invalidate_page runs, kvm_unmap_hva will release it
492 * The sequence increase only need to be seen at spin_unlock
493 * time, and not at spin_lock time.
495 * Increasing the sequence after the spin_unlock would be
496 * unsafe because the kvm page fault could then establish the
497 * pte after kvm_unmap_hva returned, without noticing the page
498 * is going to be freed.
500 spin_lock(&kvm
->mmu_lock
);
501 kvm
->mmu_notifier_seq
++;
502 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
503 spin_unlock(&kvm
->mmu_lock
);
505 /* we've to flush the tlb before the pages can be freed */
507 kvm_flush_remote_tlbs(kvm
);
511 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
512 struct mm_struct
*mm
,
516 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
517 int need_tlb_flush
= 0;
519 spin_lock(&kvm
->mmu_lock
);
521 * The count increase must become visible at unlock time as no
522 * spte can be established without taking the mmu_lock and
523 * count is also read inside the mmu_lock critical section.
525 kvm
->mmu_notifier_count
++;
526 for (; start
< end
; start
+= PAGE_SIZE
)
527 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
528 spin_unlock(&kvm
->mmu_lock
);
530 /* we've to flush the tlb before the pages can be freed */
532 kvm_flush_remote_tlbs(kvm
);
535 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
536 struct mm_struct
*mm
,
540 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
542 spin_lock(&kvm
->mmu_lock
);
544 * This sequence increase will notify the kvm page fault that
545 * the page that is going to be mapped in the spte could have
548 kvm
->mmu_notifier_seq
++;
550 * The above sequence increase must be visible before the
551 * below count decrease but both values are read by the kvm
552 * page fault under mmu_lock spinlock so we don't need to add
553 * a smb_wmb() here in between the two.
555 kvm
->mmu_notifier_count
--;
556 spin_unlock(&kvm
->mmu_lock
);
558 BUG_ON(kvm
->mmu_notifier_count
< 0);
561 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
562 struct mm_struct
*mm
,
563 unsigned long address
)
565 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
568 spin_lock(&kvm
->mmu_lock
);
569 young
= kvm_age_hva(kvm
, address
);
570 spin_unlock(&kvm
->mmu_lock
);
573 kvm_flush_remote_tlbs(kvm
);
578 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
579 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
580 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
581 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
582 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
584 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
586 static struct kvm
*kvm_create_vm(void)
588 struct kvm
*kvm
= kvm_arch_create_vm();
589 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
596 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
597 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
600 return ERR_PTR(-ENOMEM
);
602 kvm
->coalesced_mmio_ring
=
603 (struct kvm_coalesced_mmio_ring
*)page_address(page
);
606 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
609 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
610 err
= mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
612 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
621 kvm
->mm
= current
->mm
;
622 atomic_inc(&kvm
->mm
->mm_count
);
623 spin_lock_init(&kvm
->mmu_lock
);
624 kvm_io_bus_init(&kvm
->pio_bus
);
625 mutex_init(&kvm
->lock
);
626 kvm_io_bus_init(&kvm
->mmio_bus
);
627 init_rwsem(&kvm
->slots_lock
);
628 atomic_set(&kvm
->users_count
, 1);
629 spin_lock(&kvm_lock
);
630 list_add(&kvm
->vm_list
, &vm_list
);
631 spin_unlock(&kvm_lock
);
632 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
633 kvm_coalesced_mmio_init(kvm
);
640 * Free any memory in @free but not in @dont.
642 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
643 struct kvm_memory_slot
*dont
)
645 if (!dont
|| free
->rmap
!= dont
->rmap
)
648 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
649 vfree(free
->dirty_bitmap
);
651 if (!dont
|| free
->lpage_info
!= dont
->lpage_info
)
652 vfree(free
->lpage_info
);
655 free
->dirty_bitmap
= NULL
;
657 free
->lpage_info
= NULL
;
660 void kvm_free_physmem(struct kvm
*kvm
)
664 for (i
= 0; i
< kvm
->nmemslots
; ++i
)
665 kvm_free_physmem_slot(&kvm
->memslots
[i
], NULL
);
668 static void kvm_destroy_vm(struct kvm
*kvm
)
670 struct mm_struct
*mm
= kvm
->mm
;
672 spin_lock(&kvm_lock
);
673 list_del(&kvm
->vm_list
);
674 spin_unlock(&kvm_lock
);
675 kvm_io_bus_destroy(&kvm
->pio_bus
);
676 kvm_io_bus_destroy(&kvm
->mmio_bus
);
677 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
678 if (kvm
->coalesced_mmio_ring
!= NULL
)
679 free_page((unsigned long)kvm
->coalesced_mmio_ring
);
681 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
682 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
684 kvm_arch_destroy_vm(kvm
);
688 void kvm_get_kvm(struct kvm
*kvm
)
690 atomic_inc(&kvm
->users_count
);
692 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
694 void kvm_put_kvm(struct kvm
*kvm
)
696 if (atomic_dec_and_test(&kvm
->users_count
))
699 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
702 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
704 struct kvm
*kvm
= filp
->private_data
;
711 * Allocate some memory and give it an address in the guest physical address
714 * Discontiguous memory is allowed, mostly for framebuffers.
716 * Must be called holding mmap_sem for write.
718 int __kvm_set_memory_region(struct kvm
*kvm
,
719 struct kvm_userspace_memory_region
*mem
,
724 unsigned long npages
;
726 struct kvm_memory_slot
*memslot
;
727 struct kvm_memory_slot old
, new;
730 /* General sanity checks */
731 if (mem
->memory_size
& (PAGE_SIZE
- 1))
733 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
735 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
737 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
739 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
742 memslot
= &kvm
->memslots
[mem
->slot
];
743 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
744 npages
= mem
->memory_size
>> PAGE_SHIFT
;
747 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
749 new = old
= *memslot
;
751 new.base_gfn
= base_gfn
;
753 new.flags
= mem
->flags
;
755 /* Disallow changing a memory slot's size. */
757 if (npages
&& old
.npages
&& npages
!= old
.npages
)
760 /* Check for overlaps */
762 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
763 struct kvm_memory_slot
*s
= &kvm
->memslots
[i
];
767 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
768 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
772 /* Free page dirty bitmap if unneeded */
773 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
774 new.dirty_bitmap
= NULL
;
778 /* Allocate if a slot is being created */
780 if (npages
&& !new.rmap
) {
781 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
786 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
788 new.user_alloc
= user_alloc
;
790 * hva_to_rmmap() serialzies with the mmu_lock and to be
791 * safe it has to ignore memslots with !user_alloc &&
795 new.userspace_addr
= mem
->userspace_addr
;
797 new.userspace_addr
= 0;
799 if (npages
&& !new.lpage_info
) {
800 int largepages
= npages
/ KVM_PAGES_PER_HPAGE
;
801 if (npages
% KVM_PAGES_PER_HPAGE
)
803 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
806 new.lpage_info
= vmalloc(largepages
* sizeof(*new.lpage_info
));
811 memset(new.lpage_info
, 0, largepages
* sizeof(*new.lpage_info
));
813 if (base_gfn
% KVM_PAGES_PER_HPAGE
)
814 new.lpage_info
[0].write_count
= 1;
815 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE
)
816 new.lpage_info
[largepages
-1].write_count
= 1;
819 /* Allocate page dirty bitmap if needed */
820 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
821 unsigned dirty_bytes
= ALIGN(npages
, BITS_PER_LONG
) / 8;
823 new.dirty_bitmap
= vmalloc(dirty_bytes
);
824 if (!new.dirty_bitmap
)
826 memset(new.dirty_bitmap
, 0, dirty_bytes
);
828 #endif /* not defined CONFIG_S390 */
831 kvm_arch_flush_shadow(kvm
);
833 spin_lock(&kvm
->mmu_lock
);
834 if (mem
->slot
>= kvm
->nmemslots
)
835 kvm
->nmemslots
= mem
->slot
+ 1;
838 spin_unlock(&kvm
->mmu_lock
);
840 r
= kvm_arch_set_memory_region(kvm
, mem
, old
, user_alloc
);
842 spin_lock(&kvm
->mmu_lock
);
844 spin_unlock(&kvm
->mmu_lock
);
848 kvm_free_physmem_slot(&old
, &new);
850 /* map the pages in iommu page table */
851 r
= kvm_iommu_map_pages(kvm
, base_gfn
, npages
);
858 kvm_free_physmem_slot(&new, &old
);
863 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
865 int kvm_set_memory_region(struct kvm
*kvm
,
866 struct kvm_userspace_memory_region
*mem
,
871 down_write(&kvm
->slots_lock
);
872 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
873 up_write(&kvm
->slots_lock
);
876 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
878 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
880 kvm_userspace_memory_region
*mem
,
883 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
885 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
888 int kvm_get_dirty_log(struct kvm
*kvm
,
889 struct kvm_dirty_log
*log
, int *is_dirty
)
891 struct kvm_memory_slot
*memslot
;
894 unsigned long any
= 0;
897 if (log
->slot
>= KVM_MEMORY_SLOTS
)
900 memslot
= &kvm
->memslots
[log
->slot
];
902 if (!memslot
->dirty_bitmap
)
905 n
= ALIGN(memslot
->npages
, BITS_PER_LONG
) / 8;
907 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
908 any
= memslot
->dirty_bitmap
[i
];
911 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
922 int is_error_page(struct page
*page
)
924 return page
== bad_page
;
926 EXPORT_SYMBOL_GPL(is_error_page
);
928 int is_error_pfn(pfn_t pfn
)
930 return pfn
== bad_pfn
;
932 EXPORT_SYMBOL_GPL(is_error_pfn
);
934 static inline unsigned long bad_hva(void)
939 int kvm_is_error_hva(unsigned long addr
)
941 return addr
== bad_hva();
943 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
945 struct kvm_memory_slot
*gfn_to_memslot_unaliased(struct kvm
*kvm
, gfn_t gfn
)
949 for (i
= 0; i
< kvm
->nmemslots
; ++i
) {
950 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
952 if (gfn
>= memslot
->base_gfn
953 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
958 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased
);
960 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
962 gfn
= unalias_gfn(kvm
, gfn
);
963 return gfn_to_memslot_unaliased(kvm
, gfn
);
966 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
970 gfn
= unalias_gfn(kvm
, gfn
);
971 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
972 struct kvm_memory_slot
*memslot
= &kvm
->memslots
[i
];
974 if (gfn
>= memslot
->base_gfn
975 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
980 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
982 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
984 struct kvm_memory_slot
*slot
;
986 gfn
= unalias_gfn(kvm
, gfn
);
987 slot
= gfn_to_memslot_unaliased(kvm
, gfn
);
990 return (slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
);
992 EXPORT_SYMBOL_GPL(gfn_to_hva
);
994 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
996 struct page
*page
[1];
1003 addr
= gfn_to_hva(kvm
, gfn
);
1004 if (kvm_is_error_hva(addr
)) {
1006 return page_to_pfn(bad_page
);
1009 npages
= get_user_pages_fast(addr
, 1, 1, page
);
1011 if (unlikely(npages
!= 1)) {
1012 struct vm_area_struct
*vma
;
1014 down_read(¤t
->mm
->mmap_sem
);
1015 vma
= find_vma(current
->mm
, addr
);
1017 if (vma
== NULL
|| addr
< vma
->vm_start
||
1018 !(vma
->vm_flags
& VM_PFNMAP
)) {
1019 up_read(¤t
->mm
->mmap_sem
);
1021 return page_to_pfn(bad_page
);
1024 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
1025 up_read(¤t
->mm
->mmap_sem
);
1026 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1028 pfn
= page_to_pfn(page
[0]);
1033 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1035 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1039 pfn
= gfn_to_pfn(kvm
, gfn
);
1040 if (!kvm_is_mmio_pfn(pfn
))
1041 return pfn_to_page(pfn
);
1043 WARN_ON(kvm_is_mmio_pfn(pfn
));
1049 EXPORT_SYMBOL_GPL(gfn_to_page
);
1051 void kvm_release_page_clean(struct page
*page
)
1053 kvm_release_pfn_clean(page_to_pfn(page
));
1055 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1057 void kvm_release_pfn_clean(pfn_t pfn
)
1059 if (!kvm_is_mmio_pfn(pfn
))
1060 put_page(pfn_to_page(pfn
));
1062 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1064 void kvm_release_page_dirty(struct page
*page
)
1066 kvm_release_pfn_dirty(page_to_pfn(page
));
1068 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1070 void kvm_release_pfn_dirty(pfn_t pfn
)
1072 kvm_set_pfn_dirty(pfn
);
1073 kvm_release_pfn_clean(pfn
);
1075 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1077 void kvm_set_page_dirty(struct page
*page
)
1079 kvm_set_pfn_dirty(page_to_pfn(page
));
1081 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1083 void kvm_set_pfn_dirty(pfn_t pfn
)
1085 if (!kvm_is_mmio_pfn(pfn
)) {
1086 struct page
*page
= pfn_to_page(pfn
);
1087 if (!PageReserved(page
))
1091 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1093 void kvm_set_pfn_accessed(pfn_t pfn
)
1095 if (!kvm_is_mmio_pfn(pfn
))
1096 mark_page_accessed(pfn_to_page(pfn
));
1098 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1100 void kvm_get_pfn(pfn_t pfn
)
1102 if (!kvm_is_mmio_pfn(pfn
))
1103 get_page(pfn_to_page(pfn
));
1105 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1107 static int next_segment(unsigned long len
, int offset
)
1109 if (len
> PAGE_SIZE
- offset
)
1110 return PAGE_SIZE
- offset
;
1115 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1121 addr
= gfn_to_hva(kvm
, gfn
);
1122 if (kvm_is_error_hva(addr
))
1124 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1129 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1131 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1133 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1135 int offset
= offset_in_page(gpa
);
1138 while ((seg
= next_segment(len
, offset
)) != 0) {
1139 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1149 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1151 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1156 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1157 int offset
= offset_in_page(gpa
);
1159 addr
= gfn_to_hva(kvm
, gfn
);
1160 if (kvm_is_error_hva(addr
))
1162 pagefault_disable();
1163 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1169 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1171 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1172 int offset
, int len
)
1177 addr
= gfn_to_hva(kvm
, gfn
);
1178 if (kvm_is_error_hva(addr
))
1180 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1183 mark_page_dirty(kvm
, gfn
);
1186 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1188 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1191 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1193 int offset
= offset_in_page(gpa
);
1196 while ((seg
= next_segment(len
, offset
)) != 0) {
1197 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1208 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1210 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1212 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1214 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1216 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1218 int offset
= offset_in_page(gpa
);
1221 while ((seg
= next_segment(len
, offset
)) != 0) {
1222 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1231 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1233 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1235 struct kvm_memory_slot
*memslot
;
1237 gfn
= unalias_gfn(kvm
, gfn
);
1238 memslot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1239 if (memslot
&& memslot
->dirty_bitmap
) {
1240 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1243 if (!test_bit(rel_gfn
, memslot
->dirty_bitmap
))
1244 set_bit(rel_gfn
, memslot
->dirty_bitmap
);
1249 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1251 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1256 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1258 if (kvm_cpu_has_interrupt(vcpu
) ||
1259 kvm_cpu_has_pending_timer(vcpu
) ||
1260 kvm_arch_vcpu_runnable(vcpu
)) {
1261 set_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
1264 if (signal_pending(current
))
1272 finish_wait(&vcpu
->wq
, &wait
);
1275 void kvm_resched(struct kvm_vcpu
*vcpu
)
1277 if (!need_resched())
1281 EXPORT_SYMBOL_GPL(kvm_resched
);
1283 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1285 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1288 if (vmf
->pgoff
== 0)
1289 page
= virt_to_page(vcpu
->run
);
1291 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1292 page
= virt_to_page(vcpu
->arch
.pio_data
);
1294 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1295 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1296 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1299 return VM_FAULT_SIGBUS
;
1305 static struct vm_operations_struct kvm_vcpu_vm_ops
= {
1306 .fault
= kvm_vcpu_fault
,
1309 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1311 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1315 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1317 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1319 kvm_put_kvm(vcpu
->kvm
);
1323 static const struct file_operations kvm_vcpu_fops
= {
1324 .release
= kvm_vcpu_release
,
1325 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1326 .compat_ioctl
= kvm_vcpu_ioctl
,
1327 .mmap
= kvm_vcpu_mmap
,
1331 * Allocates an inode for the vcpu.
1333 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1335 int fd
= anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, 0);
1337 kvm_put_kvm(vcpu
->kvm
);
1342 * Creates some virtual cpus. Good luck creating more than one.
1344 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, int n
)
1347 struct kvm_vcpu
*vcpu
;
1352 vcpu
= kvm_arch_vcpu_create(kvm
, n
);
1354 return PTR_ERR(vcpu
);
1356 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1358 r
= kvm_arch_vcpu_setup(vcpu
);
1362 mutex_lock(&kvm
->lock
);
1363 if (kvm
->vcpus
[n
]) {
1367 kvm
->vcpus
[n
] = vcpu
;
1368 mutex_unlock(&kvm
->lock
);
1370 /* Now it's all set up, let userspace reach it */
1372 r
= create_vcpu_fd(vcpu
);
1378 mutex_lock(&kvm
->lock
);
1379 kvm
->vcpus
[n
] = NULL
;
1381 mutex_unlock(&kvm
->lock
);
1382 kvm_arch_vcpu_destroy(vcpu
);
1386 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1389 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1390 vcpu
->sigset_active
= 1;
1391 vcpu
->sigset
= *sigset
;
1393 vcpu
->sigset_active
= 0;
1397 static long kvm_vcpu_ioctl(struct file
*filp
,
1398 unsigned int ioctl
, unsigned long arg
)
1400 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1401 void __user
*argp
= (void __user
*)arg
;
1403 struct kvm_fpu
*fpu
= NULL
;
1404 struct kvm_sregs
*kvm_sregs
= NULL
;
1406 if (vcpu
->kvm
->mm
!= current
->mm
)
1413 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1415 case KVM_GET_REGS
: {
1416 struct kvm_regs
*kvm_regs
;
1419 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1422 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1426 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1433 case KVM_SET_REGS
: {
1434 struct kvm_regs
*kvm_regs
;
1437 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1441 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1443 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1451 case KVM_GET_SREGS
: {
1452 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1456 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1460 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1465 case KVM_SET_SREGS
: {
1466 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1471 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1473 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1479 case KVM_GET_MP_STATE
: {
1480 struct kvm_mp_state mp_state
;
1482 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1486 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1491 case KVM_SET_MP_STATE
: {
1492 struct kvm_mp_state mp_state
;
1495 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1497 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1503 case KVM_TRANSLATE
: {
1504 struct kvm_translation tr
;
1507 if (copy_from_user(&tr
, argp
, sizeof tr
))
1509 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1513 if (copy_to_user(argp
, &tr
, sizeof tr
))
1518 case KVM_DEBUG_GUEST
: {
1519 struct kvm_debug_guest dbg
;
1522 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1524 r
= kvm_arch_vcpu_ioctl_debug_guest(vcpu
, &dbg
);
1530 case KVM_SET_SIGNAL_MASK
: {
1531 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1532 struct kvm_signal_mask kvm_sigmask
;
1533 sigset_t sigset
, *p
;
1538 if (copy_from_user(&kvm_sigmask
, argp
,
1539 sizeof kvm_sigmask
))
1542 if (kvm_sigmask
.len
!= sizeof sigset
)
1545 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1550 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1554 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1558 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1562 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1568 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1573 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
1575 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1582 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1590 static long kvm_vm_ioctl(struct file
*filp
,
1591 unsigned int ioctl
, unsigned long arg
)
1593 struct kvm
*kvm
= filp
->private_data
;
1594 void __user
*argp
= (void __user
*)arg
;
1597 if (kvm
->mm
!= current
->mm
)
1600 case KVM_CREATE_VCPU
:
1601 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1605 case KVM_SET_USER_MEMORY_REGION
: {
1606 struct kvm_userspace_memory_region kvm_userspace_mem
;
1609 if (copy_from_user(&kvm_userspace_mem
, argp
,
1610 sizeof kvm_userspace_mem
))
1613 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
1618 case KVM_GET_DIRTY_LOG
: {
1619 struct kvm_dirty_log log
;
1622 if (copy_from_user(&log
, argp
, sizeof log
))
1624 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1629 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1630 case KVM_REGISTER_COALESCED_MMIO
: {
1631 struct kvm_coalesced_mmio_zone zone
;
1633 if (copy_from_user(&zone
, argp
, sizeof zone
))
1636 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
1642 case KVM_UNREGISTER_COALESCED_MMIO
: {
1643 struct kvm_coalesced_mmio_zone zone
;
1645 if (copy_from_user(&zone
, argp
, sizeof zone
))
1648 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
1655 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
1656 case KVM_ASSIGN_PCI_DEVICE
: {
1657 struct kvm_assigned_pci_dev assigned_dev
;
1660 if (copy_from_user(&assigned_dev
, argp
, sizeof assigned_dev
))
1662 r
= kvm_vm_ioctl_assign_device(kvm
, &assigned_dev
);
1667 case KVM_ASSIGN_IRQ
: {
1668 struct kvm_assigned_irq assigned_irq
;
1671 if (copy_from_user(&assigned_irq
, argp
, sizeof assigned_irq
))
1673 r
= kvm_vm_ioctl_assign_irq(kvm
, &assigned_irq
);
1680 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
1686 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1688 struct page
*page
[1];
1691 gfn_t gfn
= vmf
->pgoff
;
1692 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1694 addr
= gfn_to_hva(kvm
, gfn
);
1695 if (kvm_is_error_hva(addr
))
1696 return VM_FAULT_SIGBUS
;
1698 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
1700 if (unlikely(npages
!= 1))
1701 return VM_FAULT_SIGBUS
;
1703 vmf
->page
= page
[0];
1707 static struct vm_operations_struct kvm_vm_vm_ops
= {
1708 .fault
= kvm_vm_fault
,
1711 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1713 vma
->vm_ops
= &kvm_vm_vm_ops
;
1717 static const struct file_operations kvm_vm_fops
= {
1718 .release
= kvm_vm_release
,
1719 .unlocked_ioctl
= kvm_vm_ioctl
,
1720 .compat_ioctl
= kvm_vm_ioctl
,
1721 .mmap
= kvm_vm_mmap
,
1724 static int kvm_dev_ioctl_create_vm(void)
1729 kvm
= kvm_create_vm();
1731 return PTR_ERR(kvm
);
1732 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, 0);
1739 static long kvm_dev_ioctl(struct file
*filp
,
1740 unsigned int ioctl
, unsigned long arg
)
1745 case KVM_GET_API_VERSION
:
1749 r
= KVM_API_VERSION
;
1755 r
= kvm_dev_ioctl_create_vm();
1757 case KVM_CHECK_EXTENSION
:
1758 r
= kvm_dev_ioctl_check_extension(arg
);
1760 case KVM_GET_VCPU_MMAP_SIZE
:
1764 r
= PAGE_SIZE
; /* struct kvm_run */
1766 r
+= PAGE_SIZE
; /* pio data page */
1768 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1769 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
1772 case KVM_TRACE_ENABLE
:
1773 case KVM_TRACE_PAUSE
:
1774 case KVM_TRACE_DISABLE
:
1775 r
= kvm_trace_ioctl(ioctl
, arg
);
1778 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
1784 static struct file_operations kvm_chardev_ops
= {
1785 .unlocked_ioctl
= kvm_dev_ioctl
,
1786 .compat_ioctl
= kvm_dev_ioctl
,
1789 static struct miscdevice kvm_dev
= {
1795 static void hardware_enable(void *junk
)
1797 int cpu
= raw_smp_processor_id();
1799 if (cpu_isset(cpu
, cpus_hardware_enabled
))
1801 cpu_set(cpu
, cpus_hardware_enabled
);
1802 kvm_arch_hardware_enable(NULL
);
1805 static void hardware_disable(void *junk
)
1807 int cpu
= raw_smp_processor_id();
1809 if (!cpu_isset(cpu
, cpus_hardware_enabled
))
1811 cpu_clear(cpu
, cpus_hardware_enabled
);
1812 kvm_arch_hardware_disable(NULL
);
1815 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
1820 val
&= ~CPU_TASKS_FROZEN
;
1823 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1825 hardware_disable(NULL
);
1827 case CPU_UP_CANCELED
:
1828 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1830 smp_call_function_single(cpu
, hardware_disable
, NULL
, 1);
1833 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
1835 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
1842 asmlinkage
void kvm_handle_fault_on_reboot(void)
1845 /* spin while reset goes on */
1848 /* Fault while not rebooting. We want the trace. */
1851 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
1853 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1856 if (val
== SYS_RESTART
) {
1858 * Some (well, at least mine) BIOSes hang on reboot if
1861 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1862 kvm_rebooting
= true;
1863 on_each_cpu(hardware_disable
, NULL
, 1);
1868 static struct notifier_block kvm_reboot_notifier
= {
1869 .notifier_call
= kvm_reboot
,
1873 void kvm_io_bus_init(struct kvm_io_bus
*bus
)
1875 memset(bus
, 0, sizeof(*bus
));
1878 void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
1882 for (i
= 0; i
< bus
->dev_count
; i
++) {
1883 struct kvm_io_device
*pos
= bus
->devs
[i
];
1885 kvm_iodevice_destructor(pos
);
1889 struct kvm_io_device
*kvm_io_bus_find_dev(struct kvm_io_bus
*bus
,
1890 gpa_t addr
, int len
, int is_write
)
1894 for (i
= 0; i
< bus
->dev_count
; i
++) {
1895 struct kvm_io_device
*pos
= bus
->devs
[i
];
1897 if (pos
->in_range(pos
, addr
, len
, is_write
))
1904 void kvm_io_bus_register_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
)
1906 BUG_ON(bus
->dev_count
> (NR_IOBUS_DEVS
-1));
1908 bus
->devs
[bus
->dev_count
++] = dev
;
1911 static struct notifier_block kvm_cpu_notifier
= {
1912 .notifier_call
= kvm_cpu_hotplug
,
1913 .priority
= 20, /* must be > scheduler priority */
1916 static int vm_stat_get(void *_offset
, u64
*val
)
1918 unsigned offset
= (long)_offset
;
1922 spin_lock(&kvm_lock
);
1923 list_for_each_entry(kvm
, &vm_list
, vm_list
)
1924 *val
+= *(u32
*)((void *)kvm
+ offset
);
1925 spin_unlock(&kvm_lock
);
1929 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
1931 static int vcpu_stat_get(void *_offset
, u64
*val
)
1933 unsigned offset
= (long)_offset
;
1935 struct kvm_vcpu
*vcpu
;
1939 spin_lock(&kvm_lock
);
1940 list_for_each_entry(kvm
, &vm_list
, vm_list
)
1941 for (i
= 0; i
< KVM_MAX_VCPUS
; ++i
) {
1942 vcpu
= kvm
->vcpus
[i
];
1944 *val
+= *(u32
*)((void *)vcpu
+ offset
);
1946 spin_unlock(&kvm_lock
);
1950 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
1952 static struct file_operations
*stat_fops
[] = {
1953 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
1954 [KVM_STAT_VM
] = &vm_stat_fops
,
1957 static void kvm_init_debug(void)
1959 struct kvm_stats_debugfs_item
*p
;
1961 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
1962 for (p
= debugfs_entries
; p
->name
; ++p
)
1963 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
1964 (void *)(long)p
->offset
,
1965 stat_fops
[p
->kind
]);
1968 static void kvm_exit_debug(void)
1970 struct kvm_stats_debugfs_item
*p
;
1972 for (p
= debugfs_entries
; p
->name
; ++p
)
1973 debugfs_remove(p
->dentry
);
1974 debugfs_remove(kvm_debugfs_dir
);
1977 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
1979 hardware_disable(NULL
);
1983 static int kvm_resume(struct sys_device
*dev
)
1985 hardware_enable(NULL
);
1989 static struct sysdev_class kvm_sysdev_class
= {
1991 .suspend
= kvm_suspend
,
1992 .resume
= kvm_resume
,
1995 static struct sys_device kvm_sysdev
= {
1997 .cls
= &kvm_sysdev_class
,
2000 struct page
*bad_page
;
2004 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2006 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2009 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2011 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2013 kvm_arch_vcpu_load(vcpu
, cpu
);
2016 static void kvm_sched_out(struct preempt_notifier
*pn
,
2017 struct task_struct
*next
)
2019 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2021 kvm_arch_vcpu_put(vcpu
);
2024 int kvm_init(void *opaque
, unsigned int vcpu_size
,
2025 struct module
*module
)
2032 r
= kvm_arch_init(opaque
);
2036 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2038 if (bad_page
== NULL
) {
2043 bad_pfn
= page_to_pfn(bad_page
);
2045 r
= kvm_arch_hardware_setup();
2049 for_each_online_cpu(cpu
) {
2050 smp_call_function_single(cpu
,
2051 kvm_arch_check_processor_compat
,
2057 on_each_cpu(hardware_enable
, NULL
, 1);
2058 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2061 register_reboot_notifier(&kvm_reboot_notifier
);
2063 r
= sysdev_class_register(&kvm_sysdev_class
);
2067 r
= sysdev_register(&kvm_sysdev
);
2071 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2072 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
,
2073 __alignof__(struct kvm_vcpu
),
2075 if (!kvm_vcpu_cache
) {
2080 kvm_chardev_ops
.owner
= module
;
2082 r
= misc_register(&kvm_dev
);
2084 printk(KERN_ERR
"kvm: misc device register failed\n");
2088 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2089 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2094 kmem_cache_destroy(kvm_vcpu_cache
);
2096 sysdev_unregister(&kvm_sysdev
);
2098 sysdev_class_unregister(&kvm_sysdev_class
);
2100 unregister_reboot_notifier(&kvm_reboot_notifier
);
2101 unregister_cpu_notifier(&kvm_cpu_notifier
);
2103 on_each_cpu(hardware_disable
, NULL
, 1);
2105 kvm_arch_hardware_unsetup();
2107 __free_page(bad_page
);
2114 EXPORT_SYMBOL_GPL(kvm_init
);
2118 kvm_trace_cleanup();
2119 misc_deregister(&kvm_dev
);
2120 kmem_cache_destroy(kvm_vcpu_cache
);
2121 sysdev_unregister(&kvm_sysdev
);
2122 sysdev_class_unregister(&kvm_sysdev_class
);
2123 unregister_reboot_notifier(&kvm_reboot_notifier
);
2124 unregister_cpu_notifier(&kvm_cpu_notifier
);
2125 on_each_cpu(hardware_disable
, NULL
, 1);
2126 kvm_arch_hardware_unsetup();
2129 __free_page(bad_page
);
2131 EXPORT_SYMBOL_GPL(kvm_exit
);