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>
26 #include <linux/miscdevice.h>
27 #include <linux/vmalloc.h>
28 #include <linux/reboot.h>
29 #include <linux/debugfs.h>
30 #include <linux/highmem.h>
31 #include <linux/file.h>
32 #include <linux/sysdev.h>
33 #include <linux/cpu.h>
34 #include <linux/sched.h>
35 #include <linux/cpumask.h>
36 #include <linux/smp.h>
37 #include <linux/anon_inodes.h>
38 #include <linux/profile.h>
39 #include <linux/kvm_para.h>
40 #include <linux/pagemap.h>
41 #include <linux/mman.h>
42 #include <linux/swap.h>
43 #include <linux/bitops.h>
44 #include <linux/spinlock.h>
45 #include <linux/compat.h>
46 #include <linux/srcu.h>
47 #include <linux/hugetlb.h>
48 #include <linux/slab.h>
50 #include <asm/processor.h>
52 #include <asm/uaccess.h>
53 #include <asm/pgtable.h>
54 #include <asm-generic/bitops/le.h>
56 #include "coalesced_mmio.h"
58 #define CREATE_TRACE_POINTS
59 #include <trace/events/kvm.h>
61 MODULE_AUTHOR("Qumranet");
62 MODULE_LICENSE("GPL");
67 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
70 DEFINE_SPINLOCK(kvm_lock
);
73 static cpumask_var_t cpus_hardware_enabled
;
74 static int kvm_usage_count
= 0;
75 static atomic_t hardware_enable_failed
;
77 struct kmem_cache
*kvm_vcpu_cache
;
78 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
80 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
82 struct dentry
*kvm_debugfs_dir
;
84 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
86 static int hardware_enable_all(void);
87 static void hardware_disable_all(void);
89 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
91 static bool kvm_rebooting
;
93 static bool largepages_enabled
= true;
95 struct page
*hwpoison_page
;
98 inline int kvm_is_mmio_pfn(pfn_t pfn
)
100 if (pfn_valid(pfn
)) {
101 struct page
*page
= compound_head(pfn_to_page(pfn
));
102 return PageReserved(page
);
109 * Switches to specified vcpu, until a matching vcpu_put()
111 void vcpu_load(struct kvm_vcpu
*vcpu
)
115 mutex_lock(&vcpu
->mutex
);
117 preempt_notifier_register(&vcpu
->preempt_notifier
);
118 kvm_arch_vcpu_load(vcpu
, cpu
);
122 void vcpu_put(struct kvm_vcpu
*vcpu
)
125 kvm_arch_vcpu_put(vcpu
);
126 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
128 mutex_unlock(&vcpu
->mutex
);
131 static void ack_flush(void *_completed
)
135 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
140 struct kvm_vcpu
*vcpu
;
142 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
144 raw_spin_lock(&kvm
->requests_lock
);
145 me
= smp_processor_id();
146 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
147 if (test_and_set_bit(req
, &vcpu
->requests
))
150 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
)
151 cpumask_set_cpu(cpu
, cpus
);
153 if (unlikely(cpus
== NULL
))
154 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
155 else if (!cpumask_empty(cpus
))
156 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
159 raw_spin_unlock(&kvm
->requests_lock
);
160 free_cpumask_var(cpus
);
164 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
166 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
167 ++kvm
->stat
.remote_tlb_flush
;
170 void kvm_reload_remote_mmus(struct kvm
*kvm
)
172 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
175 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
180 mutex_init(&vcpu
->mutex
);
184 init_waitqueue_head(&vcpu
->wq
);
186 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
191 vcpu
->run
= page_address(page
);
193 r
= kvm_arch_vcpu_init(vcpu
);
199 free_page((unsigned long)vcpu
->run
);
203 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
205 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
207 kvm_arch_vcpu_uninit(vcpu
);
208 free_page((unsigned long)vcpu
->run
);
210 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
212 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
213 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
215 return container_of(mn
, struct kvm
, mmu_notifier
);
218 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
219 struct mm_struct
*mm
,
220 unsigned long address
)
222 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
223 int need_tlb_flush
, idx
;
226 * When ->invalidate_page runs, the linux pte has been zapped
227 * already but the page is still allocated until
228 * ->invalidate_page returns. So if we increase the sequence
229 * here the kvm page fault will notice if the spte can't be
230 * established because the page is going to be freed. If
231 * instead the kvm page fault establishes the spte before
232 * ->invalidate_page runs, kvm_unmap_hva will release it
235 * The sequence increase only need to be seen at spin_unlock
236 * time, and not at spin_lock time.
238 * Increasing the sequence after the spin_unlock would be
239 * unsafe because the kvm page fault could then establish the
240 * pte after kvm_unmap_hva returned, without noticing the page
241 * is going to be freed.
243 idx
= srcu_read_lock(&kvm
->srcu
);
244 spin_lock(&kvm
->mmu_lock
);
245 kvm
->mmu_notifier_seq
++;
246 need_tlb_flush
= kvm_unmap_hva(kvm
, address
);
247 spin_unlock(&kvm
->mmu_lock
);
248 srcu_read_unlock(&kvm
->srcu
, idx
);
250 /* we've to flush the tlb before the pages can be freed */
252 kvm_flush_remote_tlbs(kvm
);
256 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
257 struct mm_struct
*mm
,
258 unsigned long address
,
261 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
264 idx
= srcu_read_lock(&kvm
->srcu
);
265 spin_lock(&kvm
->mmu_lock
);
266 kvm
->mmu_notifier_seq
++;
267 kvm_set_spte_hva(kvm
, address
, pte
);
268 spin_unlock(&kvm
->mmu_lock
);
269 srcu_read_unlock(&kvm
->srcu
, idx
);
272 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
273 struct mm_struct
*mm
,
277 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
278 int need_tlb_flush
= 0, idx
;
280 idx
= srcu_read_lock(&kvm
->srcu
);
281 spin_lock(&kvm
->mmu_lock
);
283 * The count increase must become visible at unlock time as no
284 * spte can be established without taking the mmu_lock and
285 * count is also read inside the mmu_lock critical section.
287 kvm
->mmu_notifier_count
++;
288 for (; start
< end
; start
+= PAGE_SIZE
)
289 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
290 spin_unlock(&kvm
->mmu_lock
);
291 srcu_read_unlock(&kvm
->srcu
, idx
);
293 /* we've to flush the tlb before the pages can be freed */
295 kvm_flush_remote_tlbs(kvm
);
298 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
299 struct mm_struct
*mm
,
303 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
305 spin_lock(&kvm
->mmu_lock
);
307 * This sequence increase will notify the kvm page fault that
308 * the page that is going to be mapped in the spte could have
311 kvm
->mmu_notifier_seq
++;
313 * The above sequence increase must be visible before the
314 * below count decrease but both values are read by the kvm
315 * page fault under mmu_lock spinlock so we don't need to add
316 * a smb_wmb() here in between the two.
318 kvm
->mmu_notifier_count
--;
319 spin_unlock(&kvm
->mmu_lock
);
321 BUG_ON(kvm
->mmu_notifier_count
< 0);
324 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
325 struct mm_struct
*mm
,
326 unsigned long address
)
328 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
331 idx
= srcu_read_lock(&kvm
->srcu
);
332 spin_lock(&kvm
->mmu_lock
);
333 young
= kvm_age_hva(kvm
, address
);
334 spin_unlock(&kvm
->mmu_lock
);
335 srcu_read_unlock(&kvm
->srcu
, idx
);
338 kvm_flush_remote_tlbs(kvm
);
343 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
344 struct mm_struct
*mm
)
346 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
349 idx
= srcu_read_lock(&kvm
->srcu
);
350 kvm_arch_flush_shadow(kvm
);
351 srcu_read_unlock(&kvm
->srcu
, idx
);
354 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
355 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
356 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
357 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
358 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
359 .change_pte
= kvm_mmu_notifier_change_pte
,
360 .release
= kvm_mmu_notifier_release
,
363 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
365 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
366 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
369 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
371 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
376 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
378 static struct kvm
*kvm_create_vm(void)
381 struct kvm
*kvm
= kvm_arch_create_vm();
386 r
= hardware_enable_all();
388 goto out_err_nodisable
;
390 #ifdef CONFIG_HAVE_KVM_IRQCHIP
391 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
392 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
396 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
399 if (init_srcu_struct(&kvm
->srcu
))
401 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
402 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
404 if (!kvm
->buses
[i
]) {
405 cleanup_srcu_struct(&kvm
->srcu
);
410 r
= kvm_init_mmu_notifier(kvm
);
412 cleanup_srcu_struct(&kvm
->srcu
);
416 kvm
->mm
= current
->mm
;
417 atomic_inc(&kvm
->mm
->mm_count
);
418 spin_lock_init(&kvm
->mmu_lock
);
419 raw_spin_lock_init(&kvm
->requests_lock
);
420 kvm_eventfd_init(kvm
);
421 mutex_init(&kvm
->lock
);
422 mutex_init(&kvm
->irq_lock
);
423 mutex_init(&kvm
->slots_lock
);
424 atomic_set(&kvm
->users_count
, 1);
425 spin_lock(&kvm_lock
);
426 list_add(&kvm
->vm_list
, &vm_list
);
427 spin_unlock(&kvm_lock
);
432 hardware_disable_all();
434 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
435 kfree(kvm
->buses
[i
]);
436 kfree(kvm
->memslots
);
442 * Free any memory in @free but not in @dont.
444 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
445 struct kvm_memory_slot
*dont
)
449 if (!dont
|| free
->rmap
!= dont
->rmap
)
452 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
453 vfree(free
->dirty_bitmap
);
456 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
457 if (!dont
|| free
->lpage_info
[i
] != dont
->lpage_info
[i
]) {
458 vfree(free
->lpage_info
[i
]);
459 free
->lpage_info
[i
] = NULL
;
464 free
->dirty_bitmap
= NULL
;
468 void kvm_free_physmem(struct kvm
*kvm
)
471 struct kvm_memslots
*slots
= kvm
->memslots
;
473 for (i
= 0; i
< slots
->nmemslots
; ++i
)
474 kvm_free_physmem_slot(&slots
->memslots
[i
], NULL
);
476 kfree(kvm
->memslots
);
479 static void kvm_destroy_vm(struct kvm
*kvm
)
482 struct mm_struct
*mm
= kvm
->mm
;
484 kvm_arch_sync_events(kvm
);
485 spin_lock(&kvm_lock
);
486 list_del(&kvm
->vm_list
);
487 spin_unlock(&kvm_lock
);
488 kvm_free_irq_routing(kvm
);
489 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
490 kvm_io_bus_destroy(kvm
->buses
[i
]);
491 kvm_coalesced_mmio_free(kvm
);
492 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
493 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
495 kvm_arch_flush_shadow(kvm
);
497 kvm_arch_destroy_vm(kvm
);
498 hardware_disable_all();
502 void kvm_get_kvm(struct kvm
*kvm
)
504 atomic_inc(&kvm
->users_count
);
506 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
508 void kvm_put_kvm(struct kvm
*kvm
)
510 if (atomic_dec_and_test(&kvm
->users_count
))
513 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
516 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
518 struct kvm
*kvm
= filp
->private_data
;
520 kvm_irqfd_release(kvm
);
527 * Allocate some memory and give it an address in the guest physical address
530 * Discontiguous memory is allowed, mostly for framebuffers.
532 * Must be called holding mmap_sem for write.
534 int __kvm_set_memory_region(struct kvm
*kvm
,
535 struct kvm_userspace_memory_region
*mem
,
538 int r
, flush_shadow
= 0;
540 unsigned long npages
;
542 struct kvm_memory_slot
*memslot
;
543 struct kvm_memory_slot old
, new;
544 struct kvm_memslots
*slots
, *old_memslots
;
547 /* General sanity checks */
548 if (mem
->memory_size
& (PAGE_SIZE
- 1))
550 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
552 if (user_alloc
&& (mem
->userspace_addr
& (PAGE_SIZE
- 1)))
554 if (mem
->slot
>= KVM_MEMORY_SLOTS
+ KVM_PRIVATE_MEM_SLOTS
)
556 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
559 memslot
= &kvm
->memslots
->memslots
[mem
->slot
];
560 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
561 npages
= mem
->memory_size
>> PAGE_SHIFT
;
564 if (npages
> KVM_MEM_MAX_NR_PAGES
)
568 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
570 new = old
= *memslot
;
572 new.base_gfn
= base_gfn
;
574 new.flags
= mem
->flags
;
576 /* Disallow changing a memory slot's size. */
578 if (npages
&& old
.npages
&& npages
!= old
.npages
)
581 /* Check for overlaps */
583 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
584 struct kvm_memory_slot
*s
= &kvm
->memslots
->memslots
[i
];
586 if (s
== memslot
|| !s
->npages
)
588 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
589 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
593 /* Free page dirty bitmap if unneeded */
594 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
595 new.dirty_bitmap
= NULL
;
599 /* Allocate if a slot is being created */
601 if (npages
&& !new.rmap
) {
602 new.rmap
= vmalloc(npages
* sizeof(struct page
*));
607 memset(new.rmap
, 0, npages
* sizeof(*new.rmap
));
609 new.user_alloc
= user_alloc
;
610 new.userspace_addr
= mem
->userspace_addr
;
615 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
621 /* Avoid unused variable warning if no large pages */
624 if (new.lpage_info
[i
])
627 lpages
= 1 + (base_gfn
+ npages
- 1) /
628 KVM_PAGES_PER_HPAGE(level
);
629 lpages
-= base_gfn
/ KVM_PAGES_PER_HPAGE(level
);
631 new.lpage_info
[i
] = vmalloc(lpages
* sizeof(*new.lpage_info
[i
]));
633 if (!new.lpage_info
[i
])
636 memset(new.lpage_info
[i
], 0,
637 lpages
* sizeof(*new.lpage_info
[i
]));
639 if (base_gfn
% KVM_PAGES_PER_HPAGE(level
))
640 new.lpage_info
[i
][0].write_count
= 1;
641 if ((base_gfn
+npages
) % KVM_PAGES_PER_HPAGE(level
))
642 new.lpage_info
[i
][lpages
- 1].write_count
= 1;
643 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
645 * If the gfn and userspace address are not aligned wrt each
646 * other, or if explicitly asked to, disable large page
647 * support for this slot
649 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
651 for (j
= 0; j
< lpages
; ++j
)
652 new.lpage_info
[i
][j
].write_count
= 1;
657 /* Allocate page dirty bitmap if needed */
658 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
659 unsigned long dirty_bytes
= kvm_dirty_bitmap_bytes(&new);
661 new.dirty_bitmap
= vmalloc(dirty_bytes
);
662 if (!new.dirty_bitmap
)
664 memset(new.dirty_bitmap
, 0, dirty_bytes
);
665 /* destroy any largepage mappings for dirty tracking */
669 #else /* not defined CONFIG_S390 */
670 new.user_alloc
= user_alloc
;
672 new.userspace_addr
= mem
->userspace_addr
;
673 #endif /* not defined CONFIG_S390 */
677 slots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
680 memcpy(slots
, kvm
->memslots
, sizeof(struct kvm_memslots
));
681 if (mem
->slot
>= slots
->nmemslots
)
682 slots
->nmemslots
= mem
->slot
+ 1;
683 slots
->memslots
[mem
->slot
].flags
|= KVM_MEMSLOT_INVALID
;
685 old_memslots
= kvm
->memslots
;
686 rcu_assign_pointer(kvm
->memslots
, slots
);
687 synchronize_srcu_expedited(&kvm
->srcu
);
688 /* From this point no new shadow pages pointing to a deleted
689 * memslot will be created.
691 * validation of sp->gfn happens in:
692 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
693 * - kvm_is_visible_gfn (mmu_check_roots)
695 kvm_arch_flush_shadow(kvm
);
699 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
704 /* map the pages in iommu page table */
706 r
= kvm_iommu_map_pages(kvm
, &new);
713 slots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
716 memcpy(slots
, kvm
->memslots
, sizeof(struct kvm_memslots
));
717 if (mem
->slot
>= slots
->nmemslots
)
718 slots
->nmemslots
= mem
->slot
+ 1;
720 /* actual memory is freed via old in kvm_free_physmem_slot below */
723 new.dirty_bitmap
= NULL
;
724 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
)
725 new.lpage_info
[i
] = NULL
;
728 slots
->memslots
[mem
->slot
] = new;
729 old_memslots
= kvm
->memslots
;
730 rcu_assign_pointer(kvm
->memslots
, slots
);
731 synchronize_srcu_expedited(&kvm
->srcu
);
733 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
735 kvm_free_physmem_slot(&old
, &new);
739 kvm_arch_flush_shadow(kvm
);
744 kvm_free_physmem_slot(&new, &old
);
749 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
751 int kvm_set_memory_region(struct kvm
*kvm
,
752 struct kvm_userspace_memory_region
*mem
,
757 mutex_lock(&kvm
->slots_lock
);
758 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
759 mutex_unlock(&kvm
->slots_lock
);
762 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
764 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
766 kvm_userspace_memory_region
*mem
,
769 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
771 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
774 int kvm_get_dirty_log(struct kvm
*kvm
,
775 struct kvm_dirty_log
*log
, int *is_dirty
)
777 struct kvm_memory_slot
*memslot
;
780 unsigned long any
= 0;
783 if (log
->slot
>= KVM_MEMORY_SLOTS
)
786 memslot
= &kvm
->memslots
->memslots
[log
->slot
];
788 if (!memslot
->dirty_bitmap
)
791 n
= kvm_dirty_bitmap_bytes(memslot
);
793 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
794 any
= memslot
->dirty_bitmap
[i
];
797 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
808 void kvm_disable_largepages(void)
810 largepages_enabled
= false;
812 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
814 int is_error_page(struct page
*page
)
816 return page
== bad_page
|| page
== hwpoison_page
;
818 EXPORT_SYMBOL_GPL(is_error_page
);
820 int is_error_pfn(pfn_t pfn
)
822 return pfn
== bad_pfn
|| pfn
== hwpoison_pfn
;
824 EXPORT_SYMBOL_GPL(is_error_pfn
);
826 int is_hwpoison_pfn(pfn_t pfn
)
828 return pfn
== hwpoison_pfn
;
830 EXPORT_SYMBOL_GPL(is_hwpoison_pfn
);
832 static inline unsigned long bad_hva(void)
837 int kvm_is_error_hva(unsigned long addr
)
839 return addr
== bad_hva();
841 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
843 struct kvm_memory_slot
*gfn_to_memslot_unaliased(struct kvm
*kvm
, gfn_t gfn
)
846 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
848 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
849 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
851 if (gfn
>= memslot
->base_gfn
852 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
857 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased
);
859 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
861 gfn
= unalias_gfn(kvm
, gfn
);
862 return gfn_to_memslot_unaliased(kvm
, gfn
);
865 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
868 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
870 gfn
= unalias_gfn_instantiation(kvm
, gfn
);
871 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
872 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
874 if (memslot
->flags
& KVM_MEMSLOT_INVALID
)
877 if (gfn
>= memslot
->base_gfn
878 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
883 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
885 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
887 struct vm_area_struct
*vma
;
888 unsigned long addr
, size
;
892 addr
= gfn_to_hva(kvm
, gfn
);
893 if (kvm_is_error_hva(addr
))
896 down_read(¤t
->mm
->mmap_sem
);
897 vma
= find_vma(current
->mm
, addr
);
901 size
= vma_kernel_pagesize(vma
);
904 up_read(¤t
->mm
->mmap_sem
);
909 int memslot_id(struct kvm
*kvm
, gfn_t gfn
)
912 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
913 struct kvm_memory_slot
*memslot
= NULL
;
915 gfn
= unalias_gfn(kvm
, gfn
);
916 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
917 memslot
= &slots
->memslots
[i
];
919 if (gfn
>= memslot
->base_gfn
920 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
924 return memslot
- slots
->memslots
;
927 static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
929 return slot
->userspace_addr
+ (gfn
- slot
->base_gfn
) * PAGE_SIZE
;
932 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
934 struct kvm_memory_slot
*slot
;
936 gfn
= unalias_gfn_instantiation(kvm
, gfn
);
937 slot
= gfn_to_memslot_unaliased(kvm
, gfn
);
938 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
940 return gfn_to_hva_memslot(slot
, gfn
);
942 EXPORT_SYMBOL_GPL(gfn_to_hva
);
944 static pfn_t
hva_to_pfn(struct kvm
*kvm
, unsigned long addr
)
946 struct page
*page
[1];
952 npages
= get_user_pages_fast(addr
, 1, 1, page
);
954 if (unlikely(npages
!= 1)) {
955 struct vm_area_struct
*vma
;
957 if (is_hwpoison_address(addr
)) {
958 get_page(hwpoison_page
);
959 return page_to_pfn(hwpoison_page
);
962 down_read(¤t
->mm
->mmap_sem
);
963 vma
= find_vma(current
->mm
, addr
);
965 if (vma
== NULL
|| addr
< vma
->vm_start
||
966 !(vma
->vm_flags
& VM_PFNMAP
)) {
967 up_read(¤t
->mm
->mmap_sem
);
969 return page_to_pfn(bad_page
);
972 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) + vma
->vm_pgoff
;
973 up_read(¤t
->mm
->mmap_sem
);
974 BUG_ON(!kvm_is_mmio_pfn(pfn
));
976 pfn
= page_to_pfn(page
[0]);
981 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
985 addr
= gfn_to_hva(kvm
, gfn
);
986 if (kvm_is_error_hva(addr
)) {
988 return page_to_pfn(bad_page
);
991 return hva_to_pfn(kvm
, addr
);
993 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
995 pfn_t
gfn_to_pfn_memslot(struct kvm
*kvm
,
996 struct kvm_memory_slot
*slot
, gfn_t gfn
)
998 unsigned long addr
= gfn_to_hva_memslot(slot
, gfn
);
999 return hva_to_pfn(kvm
, addr
);
1002 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1006 pfn
= gfn_to_pfn(kvm
, gfn
);
1007 if (!kvm_is_mmio_pfn(pfn
))
1008 return pfn_to_page(pfn
);
1010 WARN_ON(kvm_is_mmio_pfn(pfn
));
1016 EXPORT_SYMBOL_GPL(gfn_to_page
);
1018 void kvm_release_page_clean(struct page
*page
)
1020 kvm_release_pfn_clean(page_to_pfn(page
));
1022 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1024 void kvm_release_pfn_clean(pfn_t pfn
)
1026 if (!kvm_is_mmio_pfn(pfn
))
1027 put_page(pfn_to_page(pfn
));
1029 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1031 void kvm_release_page_dirty(struct page
*page
)
1033 kvm_release_pfn_dirty(page_to_pfn(page
));
1035 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1037 void kvm_release_pfn_dirty(pfn_t pfn
)
1039 kvm_set_pfn_dirty(pfn
);
1040 kvm_release_pfn_clean(pfn
);
1042 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1044 void kvm_set_page_dirty(struct page
*page
)
1046 kvm_set_pfn_dirty(page_to_pfn(page
));
1048 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1050 void kvm_set_pfn_dirty(pfn_t pfn
)
1052 if (!kvm_is_mmio_pfn(pfn
)) {
1053 struct page
*page
= pfn_to_page(pfn
);
1054 if (!PageReserved(page
))
1058 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1060 void kvm_set_pfn_accessed(pfn_t pfn
)
1062 if (!kvm_is_mmio_pfn(pfn
))
1063 mark_page_accessed(pfn_to_page(pfn
));
1065 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1067 void kvm_get_pfn(pfn_t pfn
)
1069 if (!kvm_is_mmio_pfn(pfn
))
1070 get_page(pfn_to_page(pfn
));
1072 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1074 static int next_segment(unsigned long len
, int offset
)
1076 if (len
> PAGE_SIZE
- offset
)
1077 return PAGE_SIZE
- offset
;
1082 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1088 addr
= gfn_to_hva(kvm
, gfn
);
1089 if (kvm_is_error_hva(addr
))
1091 r
= copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1096 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1098 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1100 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1102 int offset
= offset_in_page(gpa
);
1105 while ((seg
= next_segment(len
, offset
)) != 0) {
1106 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1116 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1118 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1123 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1124 int offset
= offset_in_page(gpa
);
1126 addr
= gfn_to_hva(kvm
, gfn
);
1127 if (kvm_is_error_hva(addr
))
1129 pagefault_disable();
1130 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1136 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1138 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1139 int offset
, int len
)
1144 addr
= gfn_to_hva(kvm
, gfn
);
1145 if (kvm_is_error_hva(addr
))
1147 r
= copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1150 mark_page_dirty(kvm
, gfn
);
1153 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1155 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1158 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1160 int offset
= offset_in_page(gpa
);
1163 while ((seg
= next_segment(len
, offset
)) != 0) {
1164 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1175 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1177 return kvm_write_guest_page(kvm
, gfn
, empty_zero_page
, offset
, len
);
1179 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1181 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1183 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1185 int offset
= offset_in_page(gpa
);
1188 while ((seg
= next_segment(len
, offset
)) != 0) {
1189 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1198 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1200 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1202 struct kvm_memory_slot
*memslot
;
1204 gfn
= unalias_gfn(kvm
, gfn
);
1205 memslot
= gfn_to_memslot_unaliased(kvm
, gfn
);
1206 if (memslot
&& memslot
->dirty_bitmap
) {
1207 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1209 generic___set_le_bit(rel_gfn
, memslot
->dirty_bitmap
);
1214 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1216 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1221 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1223 if (kvm_arch_vcpu_runnable(vcpu
)) {
1224 set_bit(KVM_REQ_UNHALT
, &vcpu
->requests
);
1227 if (kvm_cpu_has_pending_timer(vcpu
))
1229 if (signal_pending(current
))
1235 finish_wait(&vcpu
->wq
, &wait
);
1238 void kvm_resched(struct kvm_vcpu
*vcpu
)
1240 if (!need_resched())
1244 EXPORT_SYMBOL_GPL(kvm_resched
);
1246 void kvm_vcpu_on_spin(struct kvm_vcpu
*vcpu
)
1251 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1253 /* Sleep for 100 us, and hope lock-holder got scheduled */
1254 expires
= ktime_add_ns(ktime_get(), 100000UL);
1255 schedule_hrtimeout(&expires
, HRTIMER_MODE_ABS
);
1257 finish_wait(&vcpu
->wq
, &wait
);
1259 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1261 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1263 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1266 if (vmf
->pgoff
== 0)
1267 page
= virt_to_page(vcpu
->run
);
1269 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1270 page
= virt_to_page(vcpu
->arch
.pio_data
);
1272 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1273 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1274 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1277 return VM_FAULT_SIGBUS
;
1283 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1284 .fault
= kvm_vcpu_fault
,
1287 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1289 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1293 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1295 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1297 kvm_put_kvm(vcpu
->kvm
);
1301 static struct file_operations kvm_vcpu_fops
= {
1302 .release
= kvm_vcpu_release
,
1303 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1304 .compat_ioctl
= kvm_vcpu_ioctl
,
1305 .mmap
= kvm_vcpu_mmap
,
1309 * Allocates an inode for the vcpu.
1311 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1313 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1317 * Creates some virtual cpus. Good luck creating more than one.
1319 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1322 struct kvm_vcpu
*vcpu
, *v
;
1324 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1326 return PTR_ERR(vcpu
);
1328 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1330 r
= kvm_arch_vcpu_setup(vcpu
);
1334 mutex_lock(&kvm
->lock
);
1335 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1340 kvm_for_each_vcpu(r
, v
, kvm
)
1341 if (v
->vcpu_id
== id
) {
1346 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1348 /* Now it's all set up, let userspace reach it */
1350 r
= create_vcpu_fd(vcpu
);
1356 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1358 atomic_inc(&kvm
->online_vcpus
);
1360 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1361 if (kvm
->bsp_vcpu_id
== id
)
1362 kvm
->bsp_vcpu
= vcpu
;
1364 mutex_unlock(&kvm
->lock
);
1368 mutex_unlock(&kvm
->lock
);
1369 kvm_arch_vcpu_destroy(vcpu
);
1373 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1376 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1377 vcpu
->sigset_active
= 1;
1378 vcpu
->sigset
= *sigset
;
1380 vcpu
->sigset_active
= 0;
1384 static long kvm_vcpu_ioctl(struct file
*filp
,
1385 unsigned int ioctl
, unsigned long arg
)
1387 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1388 void __user
*argp
= (void __user
*)arg
;
1390 struct kvm_fpu
*fpu
= NULL
;
1391 struct kvm_sregs
*kvm_sregs
= NULL
;
1393 if (vcpu
->kvm
->mm
!= current
->mm
)
1396 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1398 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1399 * so vcpu_load() would break it.
1401 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1402 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1412 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1414 case KVM_GET_REGS
: {
1415 struct kvm_regs
*kvm_regs
;
1418 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1421 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1425 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1432 case KVM_SET_REGS
: {
1433 struct kvm_regs
*kvm_regs
;
1436 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1440 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1442 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1450 case KVM_GET_SREGS
: {
1451 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1455 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1459 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1464 case KVM_SET_SREGS
: {
1465 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1470 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1472 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1478 case KVM_GET_MP_STATE
: {
1479 struct kvm_mp_state mp_state
;
1481 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1485 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1490 case KVM_SET_MP_STATE
: {
1491 struct kvm_mp_state mp_state
;
1494 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1496 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1502 case KVM_TRANSLATE
: {
1503 struct kvm_translation tr
;
1506 if (copy_from_user(&tr
, argp
, sizeof tr
))
1508 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1512 if (copy_to_user(argp
, &tr
, sizeof tr
))
1517 case KVM_SET_GUEST_DEBUG
: {
1518 struct kvm_guest_debug dbg
;
1521 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1523 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1529 case KVM_SET_SIGNAL_MASK
: {
1530 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1531 struct kvm_signal_mask kvm_sigmask
;
1532 sigset_t sigset
, *p
;
1537 if (copy_from_user(&kvm_sigmask
, argp
,
1538 sizeof kvm_sigmask
))
1541 if (kvm_sigmask
.len
!= sizeof sigset
)
1544 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1549 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1553 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1557 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1561 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1567 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1572 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
1574 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1581 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
))
1635 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
1641 case KVM_UNREGISTER_COALESCED_MMIO
: {
1642 struct kvm_coalesced_mmio_zone zone
;
1644 if (copy_from_user(&zone
, argp
, sizeof zone
))
1646 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
1654 struct kvm_irqfd data
;
1657 if (copy_from_user(&data
, argp
, sizeof data
))
1659 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
1662 case KVM_IOEVENTFD
: {
1663 struct kvm_ioeventfd data
;
1666 if (copy_from_user(&data
, argp
, sizeof data
))
1668 r
= kvm_ioeventfd(kvm
, &data
);
1671 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1672 case KVM_SET_BOOT_CPU_ID
:
1674 mutex_lock(&kvm
->lock
);
1675 if (atomic_read(&kvm
->online_vcpus
) != 0)
1678 kvm
->bsp_vcpu_id
= arg
;
1679 mutex_unlock(&kvm
->lock
);
1683 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
1685 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
1691 #ifdef CONFIG_COMPAT
1692 struct compat_kvm_dirty_log
{
1696 compat_uptr_t dirty_bitmap
; /* one bit per page */
1701 static long kvm_vm_compat_ioctl(struct file
*filp
,
1702 unsigned int ioctl
, unsigned long arg
)
1704 struct kvm
*kvm
= filp
->private_data
;
1707 if (kvm
->mm
!= current
->mm
)
1710 case KVM_GET_DIRTY_LOG
: {
1711 struct compat_kvm_dirty_log compat_log
;
1712 struct kvm_dirty_log log
;
1715 if (copy_from_user(&compat_log
, (void __user
*)arg
,
1716 sizeof(compat_log
)))
1718 log
.slot
= compat_log
.slot
;
1719 log
.padding1
= compat_log
.padding1
;
1720 log
.padding2
= compat_log
.padding2
;
1721 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
1723 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
1729 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
1737 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1739 struct page
*page
[1];
1742 gfn_t gfn
= vmf
->pgoff
;
1743 struct kvm
*kvm
= vma
->vm_file
->private_data
;
1745 addr
= gfn_to_hva(kvm
, gfn
);
1746 if (kvm_is_error_hva(addr
))
1747 return VM_FAULT_SIGBUS
;
1749 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
1751 if (unlikely(npages
!= 1))
1752 return VM_FAULT_SIGBUS
;
1754 vmf
->page
= page
[0];
1758 static const struct vm_operations_struct kvm_vm_vm_ops
= {
1759 .fault
= kvm_vm_fault
,
1762 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1764 vma
->vm_ops
= &kvm_vm_vm_ops
;
1768 static struct file_operations kvm_vm_fops
= {
1769 .release
= kvm_vm_release
,
1770 .unlocked_ioctl
= kvm_vm_ioctl
,
1771 #ifdef CONFIG_COMPAT
1772 .compat_ioctl
= kvm_vm_compat_ioctl
,
1774 .mmap
= kvm_vm_mmap
,
1777 static int kvm_dev_ioctl_create_vm(void)
1782 kvm
= kvm_create_vm();
1784 return PTR_ERR(kvm
);
1785 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1786 r
= kvm_coalesced_mmio_init(kvm
);
1792 fd
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
1799 static long kvm_dev_ioctl_check_extension_generic(long arg
)
1802 case KVM_CAP_USER_MEMORY
:
1803 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
1804 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
1805 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1806 case KVM_CAP_SET_BOOT_CPU_ID
:
1808 case KVM_CAP_INTERNAL_ERROR_DATA
:
1810 #ifdef CONFIG_HAVE_KVM_IRQCHIP
1811 case KVM_CAP_IRQ_ROUTING
:
1812 return KVM_MAX_IRQ_ROUTES
;
1817 return kvm_dev_ioctl_check_extension(arg
);
1820 static long kvm_dev_ioctl(struct file
*filp
,
1821 unsigned int ioctl
, unsigned long arg
)
1826 case KVM_GET_API_VERSION
:
1830 r
= KVM_API_VERSION
;
1836 r
= kvm_dev_ioctl_create_vm();
1838 case KVM_CHECK_EXTENSION
:
1839 r
= kvm_dev_ioctl_check_extension_generic(arg
);
1841 case KVM_GET_VCPU_MMAP_SIZE
:
1845 r
= PAGE_SIZE
; /* struct kvm_run */
1847 r
+= PAGE_SIZE
; /* pio data page */
1849 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1850 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
1853 case KVM_TRACE_ENABLE
:
1854 case KVM_TRACE_PAUSE
:
1855 case KVM_TRACE_DISABLE
:
1859 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
1865 static struct file_operations kvm_chardev_ops
= {
1866 .unlocked_ioctl
= kvm_dev_ioctl
,
1867 .compat_ioctl
= kvm_dev_ioctl
,
1870 static struct miscdevice kvm_dev
= {
1876 static void hardware_enable(void *junk
)
1878 int cpu
= raw_smp_processor_id();
1881 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
1884 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
1886 r
= kvm_arch_hardware_enable(NULL
);
1889 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
1890 atomic_inc(&hardware_enable_failed
);
1891 printk(KERN_INFO
"kvm: enabling virtualization on "
1892 "CPU%d failed\n", cpu
);
1896 static void hardware_disable(void *junk
)
1898 int cpu
= raw_smp_processor_id();
1900 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
1902 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
1903 kvm_arch_hardware_disable(NULL
);
1906 static void hardware_disable_all_nolock(void)
1908 BUG_ON(!kvm_usage_count
);
1911 if (!kvm_usage_count
)
1912 on_each_cpu(hardware_disable
, NULL
, 1);
1915 static void hardware_disable_all(void)
1917 spin_lock(&kvm_lock
);
1918 hardware_disable_all_nolock();
1919 spin_unlock(&kvm_lock
);
1922 static int hardware_enable_all(void)
1926 spin_lock(&kvm_lock
);
1929 if (kvm_usage_count
== 1) {
1930 atomic_set(&hardware_enable_failed
, 0);
1931 on_each_cpu(hardware_enable
, NULL
, 1);
1933 if (atomic_read(&hardware_enable_failed
)) {
1934 hardware_disable_all_nolock();
1939 spin_unlock(&kvm_lock
);
1944 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
1949 if (!kvm_usage_count
)
1952 val
&= ~CPU_TASKS_FROZEN
;
1955 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
1957 hardware_disable(NULL
);
1960 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
1962 smp_call_function_single(cpu
, hardware_enable
, NULL
, 1);
1969 asmlinkage
void kvm_handle_fault_on_reboot(void)
1972 /* spin while reset goes on */
1975 /* Fault while not rebooting. We want the trace. */
1978 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot
);
1980 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
1984 * Some (well, at least mine) BIOSes hang on reboot if
1987 * And Intel TXT required VMX off for all cpu when system shutdown.
1989 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
1990 kvm_rebooting
= true;
1991 on_each_cpu(hardware_disable
, NULL
, 1);
1995 static struct notifier_block kvm_reboot_notifier
= {
1996 .notifier_call
= kvm_reboot
,
2000 static 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
);
2012 /* kvm_io_bus_write - called under kvm->slots_lock */
2013 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2014 int len
, const void *val
)
2017 struct kvm_io_bus
*bus
;
2019 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2020 for (i
= 0; i
< bus
->dev_count
; i
++)
2021 if (!kvm_iodevice_write(bus
->devs
[i
], addr
, len
, val
))
2026 /* kvm_io_bus_read - called under kvm->slots_lock */
2027 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2031 struct kvm_io_bus
*bus
;
2033 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2034 for (i
= 0; i
< bus
->dev_count
; i
++)
2035 if (!kvm_iodevice_read(bus
->devs
[i
], addr
, len
, val
))
2040 /* Caller must hold slots_lock. */
2041 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2042 struct kvm_io_device
*dev
)
2044 struct kvm_io_bus
*new_bus
, *bus
;
2046 bus
= kvm
->buses
[bus_idx
];
2047 if (bus
->dev_count
> NR_IOBUS_DEVS
-1)
2050 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2053 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2054 new_bus
->devs
[new_bus
->dev_count
++] = dev
;
2055 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2056 synchronize_srcu_expedited(&kvm
->srcu
);
2062 /* Caller must hold slots_lock. */
2063 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2064 struct kvm_io_device
*dev
)
2067 struct kvm_io_bus
*new_bus
, *bus
;
2069 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2073 bus
= kvm
->buses
[bus_idx
];
2074 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2077 for (i
= 0; i
< new_bus
->dev_count
; i
++)
2078 if (new_bus
->devs
[i
] == dev
) {
2080 new_bus
->devs
[i
] = new_bus
->devs
[--new_bus
->dev_count
];
2089 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2090 synchronize_srcu_expedited(&kvm
->srcu
);
2095 static struct notifier_block kvm_cpu_notifier
= {
2096 .notifier_call
= kvm_cpu_hotplug
,
2097 .priority
= 20, /* must be > scheduler priority */
2100 static int vm_stat_get(void *_offset
, u64
*val
)
2102 unsigned offset
= (long)_offset
;
2106 spin_lock(&kvm_lock
);
2107 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2108 *val
+= *(u32
*)((void *)kvm
+ offset
);
2109 spin_unlock(&kvm_lock
);
2113 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2115 static int vcpu_stat_get(void *_offset
, u64
*val
)
2117 unsigned offset
= (long)_offset
;
2119 struct kvm_vcpu
*vcpu
;
2123 spin_lock(&kvm_lock
);
2124 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2125 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2126 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2128 spin_unlock(&kvm_lock
);
2132 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2134 static const struct file_operations
*stat_fops
[] = {
2135 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2136 [KVM_STAT_VM
] = &vm_stat_fops
,
2139 static void kvm_init_debug(void)
2141 struct kvm_stats_debugfs_item
*p
;
2143 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2144 for (p
= debugfs_entries
; p
->name
; ++p
)
2145 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2146 (void *)(long)p
->offset
,
2147 stat_fops
[p
->kind
]);
2150 static void kvm_exit_debug(void)
2152 struct kvm_stats_debugfs_item
*p
;
2154 for (p
= debugfs_entries
; p
->name
; ++p
)
2155 debugfs_remove(p
->dentry
);
2156 debugfs_remove(kvm_debugfs_dir
);
2159 static int kvm_suspend(struct sys_device
*dev
, pm_message_t state
)
2161 if (kvm_usage_count
)
2162 hardware_disable(NULL
);
2166 static int kvm_resume(struct sys_device
*dev
)
2168 if (kvm_usage_count
)
2169 hardware_enable(NULL
);
2173 static struct sysdev_class kvm_sysdev_class
= {
2175 .suspend
= kvm_suspend
,
2176 .resume
= kvm_resume
,
2179 static struct sys_device kvm_sysdev
= {
2181 .cls
= &kvm_sysdev_class
,
2184 struct page
*bad_page
;
2188 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2190 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2193 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2195 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2197 kvm_arch_vcpu_load(vcpu
, cpu
);
2200 static void kvm_sched_out(struct preempt_notifier
*pn
,
2201 struct task_struct
*next
)
2203 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2205 kvm_arch_vcpu_put(vcpu
);
2208 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2209 struct module
*module
)
2214 r
= kvm_arch_init(opaque
);
2218 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2220 if (bad_page
== NULL
) {
2225 bad_pfn
= page_to_pfn(bad_page
);
2227 hwpoison_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2229 if (hwpoison_page
== NULL
) {
2234 hwpoison_pfn
= page_to_pfn(hwpoison_page
);
2236 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2241 r
= kvm_arch_hardware_setup();
2245 for_each_online_cpu(cpu
) {
2246 smp_call_function_single(cpu
,
2247 kvm_arch_check_processor_compat
,
2253 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2256 register_reboot_notifier(&kvm_reboot_notifier
);
2258 r
= sysdev_class_register(&kvm_sysdev_class
);
2262 r
= sysdev_register(&kvm_sysdev
);
2266 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2268 vcpu_align
= __alignof__(struct kvm_vcpu
);
2269 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2271 if (!kvm_vcpu_cache
) {
2276 kvm_chardev_ops
.owner
= module
;
2277 kvm_vm_fops
.owner
= module
;
2278 kvm_vcpu_fops
.owner
= module
;
2280 r
= misc_register(&kvm_dev
);
2282 printk(KERN_ERR
"kvm: misc device register failed\n");
2286 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2287 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2294 kmem_cache_destroy(kvm_vcpu_cache
);
2296 sysdev_unregister(&kvm_sysdev
);
2298 sysdev_class_unregister(&kvm_sysdev_class
);
2300 unregister_reboot_notifier(&kvm_reboot_notifier
);
2301 unregister_cpu_notifier(&kvm_cpu_notifier
);
2304 kvm_arch_hardware_unsetup();
2306 free_cpumask_var(cpus_hardware_enabled
);
2309 __free_page(hwpoison_page
);
2310 __free_page(bad_page
);
2316 EXPORT_SYMBOL_GPL(kvm_init
);
2321 misc_deregister(&kvm_dev
);
2322 kmem_cache_destroy(kvm_vcpu_cache
);
2323 sysdev_unregister(&kvm_sysdev
);
2324 sysdev_class_unregister(&kvm_sysdev_class
);
2325 unregister_reboot_notifier(&kvm_reboot_notifier
);
2326 unregister_cpu_notifier(&kvm_cpu_notifier
);
2327 on_each_cpu(hardware_disable
, NULL
, 1);
2328 kvm_arch_hardware_unsetup();
2330 free_cpumask_var(cpus_hardware_enabled
);
2331 __free_page(hwpoison_page
);
2332 __free_page(bad_page
);
2334 EXPORT_SYMBOL_GPL(kvm_exit
);