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.
8 * Copyright 2010 Red Hat, Inc. and/or its affilates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.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>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
51 #include <asm/processor.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
55 #include <asm-generic/bitops/le.h>
57 #include "coalesced_mmio.h"
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/kvm.h>
62 MODULE_AUTHOR("Qumranet");
63 MODULE_LICENSE("GPL");
68 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
71 DEFINE_SPINLOCK(kvm_lock
);
74 static cpumask_var_t cpus_hardware_enabled
;
75 static int kvm_usage_count
= 0;
76 static atomic_t hardware_enable_failed
;
78 struct kmem_cache
*kvm_vcpu_cache
;
79 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
81 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
83 struct dentry
*kvm_debugfs_dir
;
85 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
87 static int hardware_enable_all(void);
88 static void hardware_disable_all(void);
90 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
92 static bool kvm_rebooting
;
94 static bool largepages_enabled
= true;
96 static struct page
*hwpoison_page
;
97 static pfn_t hwpoison_pfn
;
99 inline int kvm_is_mmio_pfn(pfn_t pfn
)
101 if (pfn_valid(pfn
)) {
102 struct page
*page
= compound_head(pfn_to_page(pfn
));
103 return PageReserved(page
);
110 * Switches to specified vcpu, until a matching vcpu_put()
112 void vcpu_load(struct kvm_vcpu
*vcpu
)
116 mutex_lock(&vcpu
->mutex
);
118 preempt_notifier_register(&vcpu
->preempt_notifier
);
119 kvm_arch_vcpu_load(vcpu
, cpu
);
123 void vcpu_put(struct kvm_vcpu
*vcpu
)
126 kvm_arch_vcpu_put(vcpu
);
127 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
129 mutex_unlock(&vcpu
->mutex
);
132 static void ack_flush(void *_completed
)
136 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
141 struct kvm_vcpu
*vcpu
;
143 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
145 raw_spin_lock(&kvm
->requests_lock
);
146 me
= smp_processor_id();
147 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
148 if (kvm_make_check_request(req
, vcpu
))
151 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
)
152 cpumask_set_cpu(cpu
, cpus
);
154 if (unlikely(cpus
== NULL
))
155 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
156 else if (!cpumask_empty(cpus
))
157 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
160 raw_spin_unlock(&kvm
->requests_lock
);
161 free_cpumask_var(cpus
);
165 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
167 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
168 ++kvm
->stat
.remote_tlb_flush
;
171 void kvm_reload_remote_mmus(struct kvm
*kvm
)
173 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
176 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
181 mutex_init(&vcpu
->mutex
);
185 init_waitqueue_head(&vcpu
->wq
);
187 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
192 vcpu
->run
= page_address(page
);
194 r
= kvm_arch_vcpu_init(vcpu
);
200 free_page((unsigned long)vcpu
->run
);
204 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
206 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
208 kvm_arch_vcpu_uninit(vcpu
);
209 free_page((unsigned long)vcpu
->run
);
211 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
213 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
214 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
216 return container_of(mn
, struct kvm
, mmu_notifier
);
219 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
220 struct mm_struct
*mm
,
221 unsigned long address
)
223 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
224 int need_tlb_flush
, idx
;
227 * When ->invalidate_page runs, the linux pte has been zapped
228 * already but the page is still allocated until
229 * ->invalidate_page returns. So if we increase the sequence
230 * here the kvm page fault will notice if the spte can't be
231 * established because the page is going to be freed. If
232 * instead the kvm page fault establishes the spte before
233 * ->invalidate_page runs, kvm_unmap_hva will release it
236 * The sequence increase only need to be seen at spin_unlock
237 * time, and not at spin_lock time.
239 * Increasing the sequence after the spin_unlock would be
240 * unsafe because the kvm page fault could then establish the
241 * pte after kvm_unmap_hva returned, without noticing the page
242 * is going to be freed.
244 idx
= srcu_read_lock(&kvm
->srcu
);
245 spin_lock(&kvm
->mmu_lock
);
246 kvm
->mmu_notifier_seq
++;
247 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
248 spin_unlock(&kvm
->mmu_lock
);
249 srcu_read_unlock(&kvm
->srcu
, idx
);
251 /* we've to flush the tlb before the pages can be freed */
253 kvm_flush_remote_tlbs(kvm
);
257 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
258 struct mm_struct
*mm
,
259 unsigned long address
,
262 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
265 idx
= srcu_read_lock(&kvm
->srcu
);
266 spin_lock(&kvm
->mmu_lock
);
267 kvm
->mmu_notifier_seq
++;
268 kvm_set_spte_hva(kvm
, address
, pte
);
269 spin_unlock(&kvm
->mmu_lock
);
270 srcu_read_unlock(&kvm
->srcu
, idx
);
273 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
274 struct mm_struct
*mm
,
278 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
279 int need_tlb_flush
= 0, idx
;
281 idx
= srcu_read_lock(&kvm
->srcu
);
282 spin_lock(&kvm
->mmu_lock
);
284 * The count increase must become visible at unlock time as no
285 * spte can be established without taking the mmu_lock and
286 * count is also read inside the mmu_lock critical section.
288 kvm
->mmu_notifier_count
++;
289 for (; start
< end
; start
+= PAGE_SIZE
)
290 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
291 spin_unlock(&kvm
->mmu_lock
);
292 srcu_read_unlock(&kvm
->srcu
, idx
);
294 /* we've to flush the tlb before the pages can be freed */
296 kvm_flush_remote_tlbs(kvm
);
299 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
300 struct mm_struct
*mm
,
304 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
306 spin_lock(&kvm
->mmu_lock
);
308 * This sequence increase will notify the kvm page fault that
309 * the page that is going to be mapped in the spte could have
312 kvm
->mmu_notifier_seq
++;
314 * The above sequence increase must be visible before the
315 * below count decrease but both values are read by the kvm
316 * page fault under mmu_lock spinlock so we don't need to add
317 * a smb_wmb() here in between the two.
319 kvm
->mmu_notifier_count
--;
320 spin_unlock(&kvm
->mmu_lock
);
322 BUG_ON(kvm
->mmu_notifier_count
< 0);
325 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
326 struct mm_struct
*mm
,
327 unsigned long address
)
329 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
332 idx
= srcu_read_lock(&kvm
->srcu
);
333 spin_lock(&kvm
->mmu_lock
);
334 young
= kvm_age_hva(kvm
, address
);
335 spin_unlock(&kvm
->mmu_lock
);
336 srcu_read_unlock(&kvm
->srcu
, idx
);
339 kvm_flush_remote_tlbs(kvm
);
344 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
345 struct mm_struct
*mm
)
347 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
350 idx
= srcu_read_lock(&kvm
->srcu
);
351 kvm_arch_flush_shadow(kvm
);
352 srcu_read_unlock(&kvm
->srcu
, idx
);
355 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
356 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
357 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
358 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
359 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
360 .change_pte
= kvm_mmu_notifier_change_pte
,
361 .release
= kvm_mmu_notifier_release
,
364 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
366 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
367 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
370 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
372 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
377 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
379 static struct kvm
*kvm_create_vm(void)
382 struct kvm
*kvm
= kvm_arch_create_vm();
387 r
= hardware_enable_all();
389 goto out_err_nodisable
;
391 #ifdef CONFIG_HAVE_KVM_IRQCHIP
392 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
393 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
397 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
400 if (init_srcu_struct(&kvm
->srcu
))
402 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
403 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
405 if (!kvm
->buses
[i
]) {
406 cleanup_srcu_struct(&kvm
->srcu
);
411 r
= kvm_init_mmu_notifier(kvm
);
413 cleanup_srcu_struct(&kvm
->srcu
);
417 kvm
->mm
= current
->mm
;
418 atomic_inc(&kvm
->mm
->mm_count
);
419 spin_lock_init(&kvm
->mmu_lock
);
420 raw_spin_lock_init(&kvm
->requests_lock
);
421 kvm_eventfd_init(kvm
);
422 mutex_init(&kvm
->lock
);
423 mutex_init(&kvm
->irq_lock
);
424 mutex_init(&kvm
->slots_lock
);
425 atomic_set(&kvm
->users_count
, 1);
426 spin_lock(&kvm_lock
);
427 list_add(&kvm
->vm_list
, &vm_list
);
428 spin_unlock(&kvm_lock
);
433 hardware_disable_all();
435 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
436 kfree(kvm
->buses
[i
]);
437 kfree(kvm
->memslots
);
443 * Free any memory in @free but not in @dont.
445 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
446 struct kvm_memory_slot
*dont
)
450 if (!dont
|| free
->rmap
!= dont
->rmap
)
453 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
454 vfree(free
->dirty_bitmap
);
457 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
458 if (!dont
|| free
->lpage_info
[i
] != dont
->lpage_info
[i
]) {
459 vfree(free
->lpage_info
[i
]);
460 free
->lpage_info
[i
] = NULL
;
465 free
->dirty_bitmap
= NULL
;
469 void kvm_free_physmem(struct kvm
*kvm
)
472 struct kvm_memslots
*slots
= kvm
->memslots
;
474 for (i
= 0; i
< slots
->nmemslots
; ++i
)
475 kvm_free_physmem_slot(&slots
->memslots
[i
], NULL
);
477 kfree(kvm
->memslots
);
480 static void kvm_destroy_vm(struct kvm
*kvm
)
483 struct mm_struct
*mm
= kvm
->mm
;
485 kvm_arch_sync_events(kvm
);
486 spin_lock(&kvm_lock
);
487 list_del(&kvm
->vm_list
);
488 spin_unlock(&kvm_lock
);
489 kvm_free_irq_routing(kvm
);
490 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
491 kvm_io_bus_destroy(kvm
->buses
[i
]);
492 kvm_coalesced_mmio_free(kvm
);
493 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
494 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
496 kvm_arch_flush_shadow(kvm
);
498 kvm_arch_destroy_vm(kvm
);
499 hardware_disable_all();
503 void kvm_get_kvm(struct kvm
*kvm
)
505 atomic_inc(&kvm
->users_count
);
507 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
509 void kvm_put_kvm(struct kvm
*kvm
)
511 if (atomic_dec_and_test(&kvm
->users_count
))
514 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
517 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
519 struct kvm
*kvm
= filp
->private_data
;
521 kvm_irqfd_release(kvm
);
528 * Allocate some memory and give it an address in the guest physical address
531 * Discontiguous memory is allowed, mostly for framebuffers.
533 * Must be called holding mmap_sem for write.
535 int __kvm_set_memory_region(struct kvm
*kvm
,
536 struct kvm_userspace_memory_region
*mem
,
539 int r
, flush_shadow
= 0;
541 unsigned long npages
;
543 struct kvm_memory_slot
*memslot
;
544 struct kvm_memory_slot old
, new;
545 struct kvm_memslots
*slots
, *old_memslots
;
548 /* General sanity checks */
549 if (mem
->memory_size
& (PAGE_SIZE
- 1))
551 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
553 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
555 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
557 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
560 memslot
= &kvm
->memslots
->memslots
[mem
->slot
];
561 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
562 npages
= mem
->memory_size
>> PAGE_SHIFT
;
565 if (npages
> KVM_MEM_MAX_NR_PAGES
)
569 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
571 new = old
= *memslot
;
574 new.base_gfn
= base_gfn
;
576 new.flags
= mem
->flags
;
578 /* Disallow changing a memory slot's size. */
580 if (npages
&& old
.npages
&& npages
!= old
.npages
)
583 /* Check for overlaps */
585 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
586 struct kvm_memory_slot
*s
= &kvm
->memslots
->memslots
[i
];
588 if (s
== memslot
|| !s
->npages
)
590 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
591 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
595 /* Free page dirty bitmap if unneeded */
596 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
597 new.dirty_bitmap
= NULL
;
601 /* Allocate if a slot is being created */
603 if (npages
&& !new.rmap
) {
604 new.rmap
= vmalloc(npages
* sizeof(*new.rmap
));
609 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
611 new.user_alloc
= user_alloc
;
612 new.userspace_addr
= mem
->userspace_addr
;
617 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
623 /* Avoid unused variable warning if no large pages */
626 if (new.lpage_info
[i
])
629 lpages
= 1 + ((base_gfn
+ npages
- 1)
630 >> KVM_HPAGE_GFN_SHIFT(level
));
631 lpages
-= base_gfn
>> KVM_HPAGE_GFN_SHIFT(level
);
633 new.lpage_info
[i
] = vmalloc(lpages
* sizeof(*new.lpage_info
[i
]));
635 if (!new.lpage_info
[i
])
638 memset(new.lpage_info
[i
], 0,
639 lpages
* sizeof(*new.lpage_info
[i
]));
641 if (base_gfn
& (KVM_PAGES_PER_HPAGE(level
) - 1))
642 new.lpage_info
[i
][0].write_count
= 1;
643 if ((base_gfn
+npages
) & (KVM_PAGES_PER_HPAGE(level
) - 1))
644 new.lpage_info
[i
][lpages
- 1].write_count
= 1;
645 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
647 * If the gfn and userspace address are not aligned wrt each
648 * other, or if explicitly asked to, disable large page
649 * support for this slot
651 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
653 for (j
= 0; j
< lpages
; ++j
)
654 new.lpage_info
[i
][j
].write_count
= 1;
659 /* Allocate page dirty bitmap if needed */
660 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
661 unsigned long dirty_bytes
= kvm_dirty_bitmap_bytes(&new);
663 new.dirty_bitmap
= vmalloc(dirty_bytes
);
664 if (!new.dirty_bitmap
)
666 memset(new.dirty_bitmap
, 0, dirty_bytes
);
667 /* destroy any largepage mappings for dirty tracking */
671 #else /* not defined CONFIG_S390 */
672 new.user_alloc
= user_alloc
;
674 new.userspace_addr
= mem
->userspace_addr
;
675 #endif /* not defined CONFIG_S390 */
679 slots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
682 memcpy(slots
, kvm
->memslots
, sizeof(struct kvm_memslots
));
683 if (mem
->slot
>= slots
->nmemslots
)
684 slots
->nmemslots
= mem
->slot
+ 1;
685 slots
->memslots
[mem
->slot
].flags
|= KVM_MEMSLOT_INVALID
;
687 old_memslots
= kvm
->memslots
;
688 rcu_assign_pointer(kvm
->memslots
, slots
);
689 synchronize_srcu_expedited(&kvm
->srcu
);
690 /* From this point no new shadow pages pointing to a deleted
691 * memslot will be created.
693 * validation of sp->gfn happens in:
694 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
695 * - kvm_is_visible_gfn (mmu_check_roots)
697 kvm_arch_flush_shadow(kvm
);
701 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
706 /* map the pages in iommu page table */
708 r
= kvm_iommu_map_pages(kvm
, &new);
715 slots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
718 memcpy(slots
, kvm
->memslots
, sizeof(struct kvm_memslots
));
719 if (mem
->slot
>= slots
->nmemslots
)
720 slots
->nmemslots
= mem
->slot
+ 1;
722 /* actual memory is freed via old in kvm_free_physmem_slot below */
725 new.dirty_bitmap
= NULL
;
726 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
)
727 new.lpage_info
[i
] = NULL
;
730 slots
->memslots
[mem
->slot
] = new;
731 old_memslots
= kvm
->memslots
;
732 rcu_assign_pointer(kvm
->memslots
, slots
);
733 synchronize_srcu_expedited(&kvm
->srcu
);
735 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
737 kvm_free_physmem_slot(&old
, &new);
741 kvm_arch_flush_shadow(kvm
);
746 kvm_free_physmem_slot(&new, &old
);
751 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
753 int kvm_set_memory_region(struct kvm
*kvm
,
754 struct kvm_userspace_memory_region
*mem
,
759 mutex_lock(&kvm
->slots_lock
);
760 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
761 mutex_unlock(&kvm
->slots_lock
);
764 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
766 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
768 kvm_userspace_memory_region
*mem
,
771 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
773 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
776 int kvm_get_dirty_log(struct kvm
*kvm
,
777 struct kvm_dirty_log
*log
, int *is_dirty
)
779 struct kvm_memory_slot
*memslot
;
782 unsigned long any
= 0;
785 if (log
->slot
>= KVM_MEMORY_SLOTS
)
788 memslot
= &kvm
->memslots
->memslots
[log
->slot
];
790 if (!memslot
->dirty_bitmap
)
793 n
= kvm_dirty_bitmap_bytes(memslot
);
795 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
796 any
= memslot
->dirty_bitmap
[i
];
799 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
810 void kvm_disable_largepages(void)
812 largepages_enabled
= false;
814 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
816 int is_error_page(struct page
*page
)
818 return page
== bad_page
|| page
== hwpoison_page
;
820 EXPORT_SYMBOL_GPL(is_error_page
);
822 int is_error_pfn(pfn_t pfn
)
824 return pfn
== bad_pfn
|| pfn
== hwpoison_pfn
;
826 EXPORT_SYMBOL_GPL(is_error_pfn
);
828 int is_hwpoison_pfn(pfn_t pfn
)
830 return pfn
== hwpoison_pfn
;
832 EXPORT_SYMBOL_GPL(is_hwpoison_pfn
);
834 static inline unsigned long bad_hva(void)
839 int kvm_is_error_hva(unsigned long addr
)
841 return addr
== bad_hva();
843 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
845 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
848 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
850 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
851 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
853 if (gfn
>= memslot
->base_gfn
854 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
859 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
861 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
864 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
866 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
867 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
869 if (memslot
->flags
& KVM_MEMSLOT_INVALID
)
872 if (gfn
>= memslot
->base_gfn
873 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
878 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
880 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
882 struct vm_area_struct
*vma
;
883 unsigned long addr
, size
;
887 addr
= gfn_to_hva(kvm
, gfn
);
888 if (kvm_is_error_hva(addr
))
891 down_read(¤t
->mm
->mmap_sem
);
892 vma
= find_vma(current
->mm
, addr
);
896 size
= vma_kernel_pagesize(vma
);
899 up_read(¤t
->mm
->mmap_sem
);
904 int memslot_id(struct kvm
*kvm
, gfn_t gfn
)
907 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
908 struct kvm_memory_slot
*memslot
= NULL
;
910 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
911 memslot
= &slots
->memslots
[i
];
913 if (gfn
>= memslot
->base_gfn
914 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
918 return memslot
- slots
->memslots
;
921 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
923 return slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
;
926 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
928 struct kvm_memory_slot
*slot
;
930 slot
= gfn_to_memslot(kvm
, gfn
);
931 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
933 return gfn_to_hva_memslot(slot
, gfn
);
935 EXPORT_SYMBOL_GPL(gfn_to_hva
);
937 static pfn_t
hva_to_pfn(struct kvm
*kvm
, unsigned long addr
)
939 struct page
*page
[1];
945 npages
= get_user_pages_fast(addr
, 1, 1, page
);
947 if (unlikely(npages
!= 1)) {
948 struct vm_area_struct
*vma
;
950 down_read(¤t
->mm
->mmap_sem
);
951 if (is_hwpoison_address(addr
)) {
952 up_read(¤t
->mm
->mmap_sem
);
953 get_page(hwpoison_page
);
954 return page_to_pfn(hwpoison_page
);
957 vma
= find_vma(current
->mm
, addr
);
959 if (vma
== NULL
|| addr
< vma
->vm_start
||
960 !(vma
->vm_flags
& VM_PFNMAP
)) {
961 up_read(¤t
->mm
->mmap_sem
);
963 return page_to_pfn(bad_page
);
966 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
967 up_read(¤t
->mm
->mmap_sem
);
968 BUG_ON(!kvm_is_mmio_pfn(pfn
));
970 pfn
= page_to_pfn(page
[0]);
975 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
979 addr
= gfn_to_hva(kvm
, gfn
);
980 if (kvm_is_error_hva(addr
)) {
982 return page_to_pfn(bad_page
);
985 return hva_to_pfn(kvm
, addr
);
987 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
989 pfn_t
gfn_to_pfn_memslot(struct kvm
*kvm
,
990 struct kvm_memory_slot
*slot
, gfn_t gfn
)
992 unsigned long addr
= gfn_to_hva_memslot(slot
, gfn
);
993 return hva_to_pfn(kvm
, addr
);
996 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1000 pfn
= gfn_to_pfn(kvm
, gfn
);
1001 if (!kvm_is_mmio_pfn(pfn
))
1002 return pfn_to_page(pfn
);
1004 WARN_ON(kvm_is_mmio_pfn(pfn
));
1010 EXPORT_SYMBOL_GPL(gfn_to_page
);
1012 void kvm_release_page_clean(struct page
*page
)
1014 kvm_release_pfn_clean(page_to_pfn(page
));
1016 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1018 void kvm_release_pfn_clean(pfn_t pfn
)
1020 if (!kvm_is_mmio_pfn(pfn
))
1021 put_page(pfn_to_page(pfn
));
1023 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1025 void kvm_release_page_dirty(struct page
*page
)
1027 kvm_release_pfn_dirty(page_to_pfn(page
));
1029 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1031 void kvm_release_pfn_dirty(pfn_t pfn
)
1033 kvm_set_pfn_dirty(pfn
);
1034 kvm_release_pfn_clean(pfn
);
1036 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1038 void kvm_set_page_dirty(struct page
*page
)
1040 kvm_set_pfn_dirty(page_to_pfn(page
));
1042 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1044 void kvm_set_pfn_dirty(pfn_t pfn
)
1046 if (!kvm_is_mmio_pfn(pfn
)) {
1047 struct page
*page
= pfn_to_page(pfn
);
1048 if (!PageReserved(page
))
1052 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1054 void kvm_set_pfn_accessed(pfn_t pfn
)
1056 if (!kvm_is_mmio_pfn(pfn
))
1057 mark_page_accessed(pfn_to_page(pfn
));
1059 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1061 void kvm_get_pfn(pfn_t pfn
)
1063 if (!kvm_is_mmio_pfn(pfn
))
1064 get_page(pfn_to_page(pfn
));
1066 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1068 static int next_segment(unsigned long len
, int offset
)
1070 if (len
> PAGE_SIZE
- offset
)
1071 return PAGE_SIZE
- offset
;
1076 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1082 addr
= gfn_to_hva(kvm
, gfn
);
1083 if (kvm_is_error_hva(addr
))
1085 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1090 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1092 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1094 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1096 int offset
= offset_in_page(gpa
);
1099 while ((seg
= next_segment(len
, offset
)) != 0) {
1100 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1110 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1112 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1117 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1118 int offset
= offset_in_page(gpa
);
1120 addr
= gfn_to_hva(kvm
, gfn
);
1121 if (kvm_is_error_hva(addr
))
1123 pagefault_disable();
1124 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1130 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1132 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1133 int offset
, int len
)
1138 addr
= gfn_to_hva(kvm
, gfn
);
1139 if (kvm_is_error_hva(addr
))
1141 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1144 mark_page_dirty(kvm
, gfn
);
1147 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1149 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1152 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1154 int offset
= offset_in_page(gpa
);
1157 while ((seg
= next_segment(len
, offset
)) != 0) {
1158 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1169 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1171 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1173 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1175 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1177 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1179 int offset
= offset_in_page(gpa
);
1182 while ((seg
= next_segment(len
, offset
)) != 0) {
1183 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1192 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1194 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1196 struct kvm_memory_slot
*memslot
;
1198 memslot
= gfn_to_memslot(kvm
, gfn
);
1199 if (memslot
&& memslot
->dirty_bitmap
) {
1200 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1202 generic___set_le_bit(rel_gfn
, memslot
->dirty_bitmap
);
1207 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1209 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1214 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1216 if (kvm_arch_vcpu_runnable(vcpu
)) {
1217 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1220 if (kvm_cpu_has_pending_timer(vcpu
))
1222 if (signal_pending(current
))
1228 finish_wait(&vcpu
->wq
, &wait
);
1231 void kvm_resched(struct kvm_vcpu
*vcpu
)
1233 if (!need_resched())
1237 EXPORT_SYMBOL_GPL(kvm_resched
);
1239 void kvm_vcpu_on_spin(struct kvm_vcpu
*vcpu
)
1244 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1246 /* Sleep for 100 us, and hope lock-holder got scheduled */
1247 expires
= ktime_add_ns(ktime_get(), 100000UL);
1248 schedule_hrtimeout(&expires
, HRTIMER_MODE_ABS
);
1250 finish_wait(&vcpu
->wq
, &wait
);
1252 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1254 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1256 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1259 if (vmf
->pgoff
== 0)
1260 page
= virt_to_page(vcpu
->run
);
1262 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1263 page
= virt_to_page(vcpu
->arch
.pio_data
);
1265 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1266 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1267 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1270 return VM_FAULT_SIGBUS
;
1276 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1277 .fault
= kvm_vcpu_fault
,
1280 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1282 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1286 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1288 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1290 kvm_put_kvm(vcpu
->kvm
);
1294 static struct file_operations kvm_vcpu_fops
= {
1295 .release
= kvm_vcpu_release
,
1296 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1297 .compat_ioctl
= kvm_vcpu_ioctl
,
1298 .mmap
= kvm_vcpu_mmap
,
1302 * Allocates an inode for the vcpu.
1304 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1306 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1310 * Creates some virtual cpus. Good luck creating more than one.
1312 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1315 struct kvm_vcpu
*vcpu
, *v
;
1317 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1319 return PTR_ERR(vcpu
);
1321 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1323 r
= kvm_arch_vcpu_setup(vcpu
);
1327 mutex_lock(&kvm
->lock
);
1328 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1333 kvm_for_each_vcpu(r
, v
, kvm
)
1334 if (v
->vcpu_id
== id
) {
1339 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1341 /* Now it's all set up, let userspace reach it */
1343 r
= create_vcpu_fd(vcpu
);
1349 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1351 atomic_inc(&kvm
->online_vcpus
);
1353 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1354 if (kvm
->bsp_vcpu_id
== id
)
1355 kvm
->bsp_vcpu
= vcpu
;
1357 mutex_unlock(&kvm
->lock
);
1361 mutex_unlock(&kvm
->lock
);
1362 kvm_arch_vcpu_destroy(vcpu
);
1366 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1369 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1370 vcpu
->sigset_active
= 1;
1371 vcpu
->sigset
= *sigset
;
1373 vcpu
->sigset_active
= 0;
1377 static long kvm_vcpu_ioctl(struct file
*filp
,
1378 unsigned int ioctl
, unsigned long arg
)
1380 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1381 void __user
*argp
= (void __user
*)arg
;
1383 struct kvm_fpu
*fpu
= NULL
;
1384 struct kvm_sregs
*kvm_sregs
= NULL
;
1386 if (vcpu
->kvm
->mm
!= current
->mm
)
1389 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1391 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1392 * so vcpu_load() would break it.
1394 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1395 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1405 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1407 case KVM_GET_REGS
: {
1408 struct kvm_regs
*kvm_regs
;
1411 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1414 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1418 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1425 case KVM_SET_REGS
: {
1426 struct kvm_regs
*kvm_regs
;
1429 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1433 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1435 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1443 case KVM_GET_SREGS
: {
1444 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1448 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1452 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1457 case KVM_SET_SREGS
: {
1458 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1463 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1465 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1471 case KVM_GET_MP_STATE
: {
1472 struct kvm_mp_state mp_state
;
1474 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1478 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1483 case KVM_SET_MP_STATE
: {
1484 struct kvm_mp_state mp_state
;
1487 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1489 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1495 case KVM_TRANSLATE
: {
1496 struct kvm_translation tr
;
1499 if (copy_from_user(&tr
, argp
, sizeof tr
))
1501 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1505 if (copy_to_user(argp
, &tr
, sizeof tr
))
1510 case KVM_SET_GUEST_DEBUG
: {
1511 struct kvm_guest_debug dbg
;
1514 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1516 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1522 case KVM_SET_SIGNAL_MASK
: {
1523 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1524 struct kvm_signal_mask kvm_sigmask
;
1525 sigset_t sigset
, *p
;
1530 if (copy_from_user(&kvm_sigmask
, argp
,
1531 sizeof kvm_sigmask
))
1534 if (kvm_sigmask
.len
!= sizeof sigset
)
1537 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1542 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
1546 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1550 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1554 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1560 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1565 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
1567 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1574 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1583 static long kvm_vm_ioctl(struct file
*filp
,
1584 unsigned int ioctl
, unsigned long arg
)
1586 struct kvm
*kvm
= filp
->private_data
;
1587 void __user
*argp
= (void __user
*)arg
;
1590 if (kvm
->mm
!= current
->mm
)
1593 case KVM_CREATE_VCPU
:
1594 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1598 case KVM_SET_USER_MEMORY_REGION
: {
1599 struct kvm_userspace_memory_region kvm_userspace_mem
;
1602 if (copy_from_user(&kvm_userspace_mem
, argp
,
1603 sizeof kvm_userspace_mem
))
1606 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
1611 case KVM_GET_DIRTY_LOG
: {
1612 struct kvm_dirty_log log
;
1615 if (copy_from_user(&log
, argp
, sizeof log
))
1617 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1622 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1623 case KVM_REGISTER_COALESCED_MMIO
: {
1624 struct kvm_coalesced_mmio_zone zone
;
1626 if (copy_from_user(&zone
, argp
, sizeof zone
))
1628 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
1634 case KVM_UNREGISTER_COALESCED_MMIO
: {
1635 struct kvm_coalesced_mmio_zone zone
;
1637 if (copy_from_user(&zone
, argp
, sizeof zone
))
1639 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
1647 struct kvm_irqfd data
;
1650 if (copy_from_user(&data
, argp
, sizeof data
))
1652 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
1655 case KVM_IOEVENTFD
: {
1656 struct kvm_ioeventfd data
;
1659 if (copy_from_user(&data
, argp
, sizeof data
))
1661 r
= kvm_ioeventfd(kvm
, &data
);
1664 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1665 case KVM_SET_BOOT_CPU_ID
:
1667 mutex_lock(&kvm
->lock
);
1668 if (atomic_read(&kvm
->online_vcpus
) != 0)
1671 kvm
->bsp_vcpu_id
= arg
;
1672 mutex_unlock(&kvm
->lock
);
1676 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
1678 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
1684 #ifdef CONFIG_COMPAT
1685 struct compat_kvm_dirty_log
{
1689 compat_uptr_t dirty_bitmap
; /* one bit per page */
1694 static long kvm_vm_compat_ioctl(struct file
*filp
,
1695 unsigned int ioctl
, unsigned long arg
)
1697 struct kvm
*kvm
= filp
->private_data
;
1700 if (kvm
->mm
!= current
->mm
)
1703 case KVM_GET_DIRTY_LOG
: {
1704 struct compat_kvm_dirty_log compat_log
;
1705 struct kvm_dirty_log log
;
1708 if (copy_from_user(&compat_log
, (void __user
*)arg
,
1709 sizeof(compat_log
)))
1711 log
.slot
= compat_log
.slot
;
1712 log
.padding1
= compat_log
.padding1
;
1713 log
.padding2
= compat_log
.padding2
;
1714 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
1716 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1722 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
1730 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1732 struct page
*page
[1];
1735 gfn_t gfn
= vmf
->pgoff
;
1736 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1738 addr
= gfn_to_hva(kvm
, gfn
);
1739 if (kvm_is_error_hva(addr
))
1740 return VM_FAULT_SIGBUS
;
1742 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
1744 if (unlikely(npages
!= 1))
1745 return VM_FAULT_SIGBUS
;
1747 vmf
->page
= page
[0];
1751 static const struct vm_operations_struct kvm_vm_vm_ops
= {
1752 .fault
= kvm_vm_fault
,
1755 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1757 vma
->vm_ops
= &kvm_vm_vm_ops
;
1761 static struct file_operations kvm_vm_fops
= {
1762 .release
= kvm_vm_release
,
1763 .unlocked_ioctl
= kvm_vm_ioctl
,
1764 #ifdef CONFIG_COMPAT
1765 .compat_ioctl
= kvm_vm_compat_ioctl
,
1767 .mmap
= kvm_vm_mmap
,
1770 static int kvm_dev_ioctl_create_vm(void)
1775 kvm
= kvm_create_vm();
1777 return PTR_ERR(kvm
);
1778 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1779 r
= kvm_coalesced_mmio_init(kvm
);
1785 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
1792 static long kvm_dev_ioctl_check_extension_generic(long arg
)
1795 case KVM_CAP_USER_MEMORY
:
1796 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
1797 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
1798 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1799 case KVM_CAP_SET_BOOT_CPU_ID
:
1801 case KVM_CAP_INTERNAL_ERROR_DATA
:
1803 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1804 case KVM_CAP_IRQ_ROUTING
:
1805 return KVM_MAX_IRQ_ROUTES
;
1810 return kvm_dev_ioctl_check_extension(arg
);
1813 static long kvm_dev_ioctl(struct file
*filp
,
1814 unsigned int ioctl
, unsigned long arg
)
1819 case KVM_GET_API_VERSION
:
1823 r
= KVM_API_VERSION
;
1829 r
= kvm_dev_ioctl_create_vm();
1831 case KVM_CHECK_EXTENSION
:
1832 r
= kvm_dev_ioctl_check_extension_generic(arg
);
1834 case KVM_GET_VCPU_MMAP_SIZE
:
1838 r
= PAGE_SIZE
; /* struct kvm_run */
1840 r
+= PAGE_SIZE
; /* pio data page */
1842 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1843 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
1846 case KVM_TRACE_ENABLE
:
1847 case KVM_TRACE_PAUSE
:
1848 case KVM_TRACE_DISABLE
:
1852 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
1858 static struct file_operations kvm_chardev_ops
= {
1859 .unlocked_ioctl
= kvm_dev_ioctl
,
1860 .compat_ioctl
= kvm_dev_ioctl
,
1863 static struct miscdevice kvm_dev
= {
1869 static void hardware_enable(void *junk
)
1871 int cpu
= raw_smp_processor_id();
1874 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
1877 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
1879 r
= kvm_arch_hardware_enable(NULL
);
1882 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
1883 atomic_inc(&hardware_enable_failed
);
1884 printk(KERN_INFO
"kvm: enabling virtualization on "
1885 "CPU%d failed\n", cpu
);
1889 static void hardware_disable(void *junk
)
1891 int cpu
= raw_smp_processor_id();
1893 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
1895 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
1896 kvm_arch_hardware_disable(NULL
);
1899 static void hardware_disable_all_nolock(void)
1901 BUG_ON(!kvm_usage_count
);
1904 if (!kvm_usage_count
)
1905 on_each_cpu(hardware_disable
, NULL
, 1);
1908 static void hardware_disable_all(void)
1910 spin_lock(&kvm_lock
);
1911 hardware_disable_all_nolock();
1912 spin_unlock(&kvm_lock
);
1915 static int hardware_enable_all(void)
1919 spin_lock(&kvm_lock
);
1922 if (kvm_usage_count
== 1) {
1923 atomic_set(&hardware_enable_failed
, 0);
1924 on_each_cpu(hardware_enable
, NULL
, 1);
1926 if (atomic_read(&hardware_enable_failed
)) {
1927 hardware_disable_all_nolock();
1932 spin_unlock(&kvm_lock
);
1937 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
1942 if (!kvm_usage_count
)
1945 val
&= ~CPU_TASKS_FROZEN
;
1948 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1950 hardware_disable(NULL
);
1953 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
1955 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
1962 asmlinkage
void kvm_handle_fault_on_reboot(void)
1965 /* spin while reset goes on */
1968 /* Fault while not rebooting. We want the trace. */
1971 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
1973 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1977 * Some (well, at least mine) BIOSes hang on reboot if
1980 * And Intel TXT required VMX off for all cpu when system shutdown.
1982 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1983 kvm_rebooting
= true;
1984 on_each_cpu(hardware_disable
, NULL
, 1);
1988 static struct notifier_block kvm_reboot_notifier
= {
1989 .notifier_call
= kvm_reboot
,
1993 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
1997 for (i
= 0; i
< bus
->dev_count
; i
++) {
1998 struct kvm_io_device
*pos
= bus
->devs
[i
];
2000 kvm_iodevice_destructor(pos
);
2005 /* kvm_io_bus_write - called under kvm->slots_lock */
2006 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2007 int len
, const void *val
)
2010 struct kvm_io_bus
*bus
;
2012 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2013 for (i
= 0; i
< bus
->dev_count
; i
++)
2014 if (!kvm_iodevice_write(bus
->devs
[i
], addr
, len
, val
))
2019 /* kvm_io_bus_read - called under kvm->slots_lock */
2020 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2024 struct kvm_io_bus
*bus
;
2026 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2027 for (i
= 0; i
< bus
->dev_count
; i
++)
2028 if (!kvm_iodevice_read(bus
->devs
[i
], addr
, len
, val
))
2033 /* Caller must hold slots_lock. */
2034 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2035 struct kvm_io_device
*dev
)
2037 struct kvm_io_bus
*new_bus
, *bus
;
2039 bus
= kvm
->buses
[bus_idx
];
2040 if (bus
->dev_count
> NR_IOBUS_DEVS
-1)
2043 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2046 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2047 new_bus
->devs
[new_bus
->dev_count
++] = dev
;
2048 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2049 synchronize_srcu_expedited(&kvm
->srcu
);
2055 /* Caller must hold slots_lock. */
2056 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2057 struct kvm_io_device
*dev
)
2060 struct kvm_io_bus
*new_bus
, *bus
;
2062 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2066 bus
= kvm
->buses
[bus_idx
];
2067 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2070 for (i
= 0; i
< new_bus
->dev_count
; i
++)
2071 if (new_bus
->devs
[i
] == dev
) {
2073 new_bus
->devs
[i
] = new_bus
->devs
[--new_bus
->dev_count
];
2082 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2083 synchronize_srcu_expedited(&kvm
->srcu
);
2088 static struct notifier_block kvm_cpu_notifier
= {
2089 .notifier_call
= kvm_cpu_hotplug
,
2090 .priority
= 20, /* must be > scheduler priority */
2093 static int vm_stat_get(void *_offset
, u64
*val
)
2095 unsigned offset
= (long)_offset
;
2099 spin_lock(&kvm_lock
);
2100 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2101 *val
+= *(u32
*)((void *)kvm
+ offset
);
2102 spin_unlock(&kvm_lock
);
2106 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2108 static int vcpu_stat_get(void *_offset
, u64
*val
)
2110 unsigned offset
= (long)_offset
;
2112 struct kvm_vcpu
*vcpu
;
2116 spin_lock(&kvm_lock
);
2117 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2118 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2119 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2121 spin_unlock(&kvm_lock
);
2125 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2127 static const struct file_operations
*stat_fops
[] = {
2128 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2129 [KVM_STAT_VM
] = &vm_stat_fops
,
2132 static void kvm_init_debug(void)
2134 struct kvm_stats_debugfs_item
*p
;
2136 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2137 for (p
= debugfs_entries
; p
->name
; ++p
)
2138 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2139 (void *)(long)p
->offset
,
2140 stat_fops
[p
->kind
]);
2143 static void kvm_exit_debug(void)
2145 struct kvm_stats_debugfs_item
*p
;
2147 for (p
= debugfs_entries
; p
->name
; ++p
)
2148 debugfs_remove(p
->dentry
);
2149 debugfs_remove(kvm_debugfs_dir
);
2152 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2154 if (kvm_usage_count
)
2155 hardware_disable(NULL
);
2159 static int kvm_resume(struct sys_device
*dev
)
2161 if (kvm_usage_count
)
2162 hardware_enable(NULL
);
2166 static struct sysdev_class kvm_sysdev_class
= {
2168 .suspend
= kvm_suspend
,
2169 .resume
= kvm_resume
,
2172 static struct sys_device kvm_sysdev
= {
2174 .cls
= &kvm_sysdev_class
,
2177 struct page
*bad_page
;
2181 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2183 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2186 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2188 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2190 kvm_arch_vcpu_load(vcpu
, cpu
);
2193 static void kvm_sched_out(struct preempt_notifier
*pn
,
2194 struct task_struct
*next
)
2196 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2198 kvm_arch_vcpu_put(vcpu
);
2201 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2202 struct module
*module
)
2207 r
= kvm_arch_init(opaque
);
2211 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2213 if (bad_page
== NULL
) {
2218 bad_pfn
= page_to_pfn(bad_page
);
2220 hwpoison_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2222 if (hwpoison_page
== NULL
) {
2227 hwpoison_pfn
= page_to_pfn(hwpoison_page
);
2229 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2234 r
= kvm_arch_hardware_setup();
2238 for_each_online_cpu(cpu
) {
2239 smp_call_function_single(cpu
,
2240 kvm_arch_check_processor_compat
,
2246 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2249 register_reboot_notifier(&kvm_reboot_notifier
);
2251 r
= sysdev_class_register(&kvm_sysdev_class
);
2255 r
= sysdev_register(&kvm_sysdev
);
2259 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2261 vcpu_align
= __alignof__(struct kvm_vcpu
);
2262 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2264 if (!kvm_vcpu_cache
) {
2269 kvm_chardev_ops
.owner
= module
;
2270 kvm_vm_fops
.owner
= module
;
2271 kvm_vcpu_fops
.owner
= module
;
2273 r
= misc_register(&kvm_dev
);
2275 printk(KERN_ERR
"kvm: misc device register failed\n");
2279 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2280 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2287 kmem_cache_destroy(kvm_vcpu_cache
);
2289 sysdev_unregister(&kvm_sysdev
);
2291 sysdev_class_unregister(&kvm_sysdev_class
);
2293 unregister_reboot_notifier(&kvm_reboot_notifier
);
2294 unregister_cpu_notifier(&kvm_cpu_notifier
);
2297 kvm_arch_hardware_unsetup();
2299 free_cpumask_var(cpus_hardware_enabled
);
2302 __free_page(hwpoison_page
);
2303 __free_page(bad_page
);
2309 EXPORT_SYMBOL_GPL(kvm_init
);
2314 misc_deregister(&kvm_dev
);
2315 kmem_cache_destroy(kvm_vcpu_cache
);
2316 sysdev_unregister(&kvm_sysdev
);
2317 sysdev_class_unregister(&kvm_sysdev_class
);
2318 unregister_reboot_notifier(&kvm_reboot_notifier
);
2319 unregister_cpu_notifier(&kvm_cpu_notifier
);
2320 on_each_cpu(hardware_disable
, NULL
, 1);
2321 kvm_arch_hardware_unsetup();
2323 free_cpumask_var(cpus_hardware_enabled
);
2324 __free_page(hwpoison_page
);
2325 __free_page(bad_page
);
2327 EXPORT_SYMBOL_GPL(kvm_exit
);