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 affiliates.
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/syscore_ops.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>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/uaccess.h>
56 #include <asm/pgtable.h>
58 #include "coalesced_mmio.h"
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
70 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
73 DEFINE_RAW_SPINLOCK(kvm_lock
);
76 static cpumask_var_t cpus_hardware_enabled
;
77 static int kvm_usage_count
= 0;
78 static atomic_t hardware_enable_failed
;
80 struct kmem_cache
*kvm_vcpu_cache
;
81 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
83 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
85 struct dentry
*kvm_debugfs_dir
;
87 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
90 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
93 static int hardware_enable_all(void);
94 static void hardware_disable_all(void);
96 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
99 EXPORT_SYMBOL_GPL(kvm_rebooting
);
101 static bool largepages_enabled
= true;
103 static struct page
*hwpoison_page
;
104 static pfn_t hwpoison_pfn
;
106 struct page
*fault_page
;
109 inline int kvm_is_mmio_pfn(pfn_t pfn
)
111 if (pfn_valid(pfn
)) {
113 struct page
*tail
= pfn_to_page(pfn
);
114 struct page
*head
= compound_trans_head(tail
);
115 reserved
= PageReserved(head
);
118 * "head" is not a dangling pointer
119 * (compound_trans_head takes care of that)
120 * but the hugepage may have been splitted
121 * from under us (and we may not hold a
122 * reference count on the head page so it can
123 * be reused before we run PageReferenced), so
124 * we've to check PageTail before returning
131 return PageReserved(tail
);
138 * Switches to specified vcpu, until a matching vcpu_put()
140 void vcpu_load(struct kvm_vcpu
*vcpu
)
144 mutex_lock(&vcpu
->mutex
);
145 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
146 /* The thread running this VCPU changed. */
147 struct pid
*oldpid
= vcpu
->pid
;
148 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
149 rcu_assign_pointer(vcpu
->pid
, newpid
);
154 preempt_notifier_register(&vcpu
->preempt_notifier
);
155 kvm_arch_vcpu_load(vcpu
, cpu
);
159 void vcpu_put(struct kvm_vcpu
*vcpu
)
162 kvm_arch_vcpu_put(vcpu
);
163 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
165 mutex_unlock(&vcpu
->mutex
);
168 static void ack_flush(void *_completed
)
172 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
177 struct kvm_vcpu
*vcpu
;
179 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
182 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
183 kvm_make_request(req
, vcpu
);
186 /* Set ->requests bit before we read ->mode */
189 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
190 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
191 cpumask_set_cpu(cpu
, cpus
);
193 if (unlikely(cpus
== NULL
))
194 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
195 else if (!cpumask_empty(cpus
))
196 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
200 free_cpumask_var(cpus
);
204 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
206 int dirty_count
= kvm
->tlbs_dirty
;
209 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
210 ++kvm
->stat
.remote_tlb_flush
;
211 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
214 void kvm_reload_remote_mmus(struct kvm
*kvm
)
216 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
219 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
224 mutex_init(&vcpu
->mutex
);
229 init_waitqueue_head(&vcpu
->wq
);
230 kvm_async_pf_vcpu_init(vcpu
);
232 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
237 vcpu
->run
= page_address(page
);
239 r
= kvm_arch_vcpu_init(vcpu
);
245 free_page((unsigned long)vcpu
->run
);
249 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
251 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
254 kvm_arch_vcpu_uninit(vcpu
);
255 free_page((unsigned long)vcpu
->run
);
257 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
259 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
260 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
262 return container_of(mn
, struct kvm
, mmu_notifier
);
265 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
266 struct mm_struct
*mm
,
267 unsigned long address
)
269 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
270 int need_tlb_flush
, idx
;
273 * When ->invalidate_page runs, the linux pte has been zapped
274 * already but the page is still allocated until
275 * ->invalidate_page returns. So if we increase the sequence
276 * here the kvm page fault will notice if the spte can't be
277 * established because the page is going to be freed. If
278 * instead the kvm page fault establishes the spte before
279 * ->invalidate_page runs, kvm_unmap_hva will release it
282 * The sequence increase only need to be seen at spin_unlock
283 * time, and not at spin_lock time.
285 * Increasing the sequence after the spin_unlock would be
286 * unsafe because the kvm page fault could then establish the
287 * pte after kvm_unmap_hva returned, without noticing the page
288 * is going to be freed.
290 idx
= srcu_read_lock(&kvm
->srcu
);
291 spin_lock(&kvm
->mmu_lock
);
292 kvm
->mmu_notifier_seq
++;
293 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
294 spin_unlock(&kvm
->mmu_lock
);
295 srcu_read_unlock(&kvm
->srcu
, idx
);
297 /* we've to flush the tlb before the pages can be freed */
299 kvm_flush_remote_tlbs(kvm
);
303 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
304 struct mm_struct
*mm
,
305 unsigned long address
,
308 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
311 idx
= srcu_read_lock(&kvm
->srcu
);
312 spin_lock(&kvm
->mmu_lock
);
313 kvm
->mmu_notifier_seq
++;
314 kvm_set_spte_hva(kvm
, address
, pte
);
315 spin_unlock(&kvm
->mmu_lock
);
316 srcu_read_unlock(&kvm
->srcu
, idx
);
319 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
320 struct mm_struct
*mm
,
324 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
325 int need_tlb_flush
= 0, idx
;
327 idx
= srcu_read_lock(&kvm
->srcu
);
328 spin_lock(&kvm
->mmu_lock
);
330 * The count increase must become visible at unlock time as no
331 * spte can be established without taking the mmu_lock and
332 * count is also read inside the mmu_lock critical section.
334 kvm
->mmu_notifier_count
++;
335 for (; start
< end
; start
+= PAGE_SIZE
)
336 need_tlb_flush
|= kvm_unmap_hva(kvm
, start
);
337 need_tlb_flush
|= kvm
->tlbs_dirty
;
338 spin_unlock(&kvm
->mmu_lock
);
339 srcu_read_unlock(&kvm
->srcu
, idx
);
341 /* we've to flush the tlb before the pages can be freed */
343 kvm_flush_remote_tlbs(kvm
);
346 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
347 struct mm_struct
*mm
,
351 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
353 spin_lock(&kvm
->mmu_lock
);
355 * This sequence increase will notify the kvm page fault that
356 * the page that is going to be mapped in the spte could have
359 kvm
->mmu_notifier_seq
++;
361 * The above sequence increase must be visible before the
362 * below count decrease but both values are read by the kvm
363 * page fault under mmu_lock spinlock so we don't need to add
364 * a smb_wmb() here in between the two.
366 kvm
->mmu_notifier_count
--;
367 spin_unlock(&kvm
->mmu_lock
);
369 BUG_ON(kvm
->mmu_notifier_count
< 0);
372 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
373 struct mm_struct
*mm
,
374 unsigned long address
)
376 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
379 idx
= srcu_read_lock(&kvm
->srcu
);
380 spin_lock(&kvm
->mmu_lock
);
381 young
= kvm_age_hva(kvm
, address
);
382 spin_unlock(&kvm
->mmu_lock
);
383 srcu_read_unlock(&kvm
->srcu
, idx
);
386 kvm_flush_remote_tlbs(kvm
);
391 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
392 struct mm_struct
*mm
,
393 unsigned long address
)
395 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
398 idx
= srcu_read_lock(&kvm
->srcu
);
399 spin_lock(&kvm
->mmu_lock
);
400 young
= kvm_test_age_hva(kvm
, address
);
401 spin_unlock(&kvm
->mmu_lock
);
402 srcu_read_unlock(&kvm
->srcu
, idx
);
407 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
408 struct mm_struct
*mm
)
410 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
413 idx
= srcu_read_lock(&kvm
->srcu
);
414 kvm_arch_flush_shadow(kvm
);
415 srcu_read_unlock(&kvm
->srcu
, idx
);
418 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
419 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
420 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
421 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
422 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
423 .test_young
= kvm_mmu_notifier_test_young
,
424 .change_pte
= kvm_mmu_notifier_change_pte
,
425 .release
= kvm_mmu_notifier_release
,
428 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
430 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
431 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
434 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
436 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
441 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
443 static struct kvm
*kvm_create_vm(void)
446 struct kvm
*kvm
= kvm_arch_alloc_vm();
449 return ERR_PTR(-ENOMEM
);
451 r
= kvm_arch_init_vm(kvm
);
453 goto out_err_nodisable
;
455 r
= hardware_enable_all();
457 goto out_err_nodisable
;
459 #ifdef CONFIG_HAVE_KVM_IRQCHIP
460 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
461 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
465 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
468 if (init_srcu_struct(&kvm
->srcu
))
470 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
471 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
477 spin_lock_init(&kvm
->mmu_lock
);
478 kvm
->mm
= current
->mm
;
479 atomic_inc(&kvm
->mm
->mm_count
);
480 kvm_eventfd_init(kvm
);
481 mutex_init(&kvm
->lock
);
482 mutex_init(&kvm
->irq_lock
);
483 mutex_init(&kvm
->slots_lock
);
484 atomic_set(&kvm
->users_count
, 1);
486 r
= kvm_init_mmu_notifier(kvm
);
490 raw_spin_lock(&kvm_lock
);
491 list_add(&kvm
->vm_list
, &vm_list
);
492 raw_spin_unlock(&kvm_lock
);
497 cleanup_srcu_struct(&kvm
->srcu
);
499 hardware_disable_all();
501 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
502 kfree(kvm
->buses
[i
]);
503 kfree(kvm
->memslots
);
504 kvm_arch_free_vm(kvm
);
508 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
510 if (!memslot
->dirty_bitmap
)
513 if (2 * kvm_dirty_bitmap_bytes(memslot
) > PAGE_SIZE
)
514 vfree(memslot
->dirty_bitmap_head
);
516 kfree(memslot
->dirty_bitmap_head
);
518 memslot
->dirty_bitmap
= NULL
;
519 memslot
->dirty_bitmap_head
= NULL
;
523 * Free any memory in @free but not in @dont.
525 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
526 struct kvm_memory_slot
*dont
)
530 if (!dont
|| free
->rmap
!= dont
->rmap
)
533 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
534 kvm_destroy_dirty_bitmap(free
);
537 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
538 if (!dont
|| free
->lpage_info
[i
] != dont
->lpage_info
[i
]) {
539 vfree(free
->lpage_info
[i
]);
540 free
->lpage_info
[i
] = NULL
;
548 void kvm_free_physmem(struct kvm
*kvm
)
551 struct kvm_memslots
*slots
= kvm
->memslots
;
553 for (i
= 0; i
< slots
->nmemslots
; ++i
)
554 kvm_free_physmem_slot(&slots
->memslots
[i
], NULL
);
556 kfree(kvm
->memslots
);
559 static void kvm_destroy_vm(struct kvm
*kvm
)
562 struct mm_struct
*mm
= kvm
->mm
;
564 kvm_arch_sync_events(kvm
);
565 raw_spin_lock(&kvm_lock
);
566 list_del(&kvm
->vm_list
);
567 raw_spin_unlock(&kvm_lock
);
568 kvm_free_irq_routing(kvm
);
569 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
570 kvm_io_bus_destroy(kvm
->buses
[i
]);
571 kvm_coalesced_mmio_free(kvm
);
572 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
573 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
575 kvm_arch_flush_shadow(kvm
);
577 kvm_arch_destroy_vm(kvm
);
578 kvm_free_physmem(kvm
);
579 cleanup_srcu_struct(&kvm
->srcu
);
580 kvm_arch_free_vm(kvm
);
581 hardware_disable_all();
585 void kvm_get_kvm(struct kvm
*kvm
)
587 atomic_inc(&kvm
->users_count
);
589 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
591 void kvm_put_kvm(struct kvm
*kvm
)
593 if (atomic_dec_and_test(&kvm
->users_count
))
596 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
599 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
601 struct kvm
*kvm
= filp
->private_data
;
603 kvm_irqfd_release(kvm
);
611 * Allocation size is twice as large as the actual dirty bitmap size.
612 * This makes it possible to do double buffering: see x86's
613 * kvm_vm_ioctl_get_dirty_log().
615 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
617 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
619 if (dirty_bytes
> PAGE_SIZE
)
620 memslot
->dirty_bitmap
= vzalloc(dirty_bytes
);
622 memslot
->dirty_bitmap
= kzalloc(dirty_bytes
, GFP_KERNEL
);
624 if (!memslot
->dirty_bitmap
)
627 memslot
->dirty_bitmap_head
= memslot
->dirty_bitmap
;
628 memslot
->nr_dirty_pages
= 0;
631 #endif /* !CONFIG_S390 */
633 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
638 slots
->memslots
[id
] = *new;
639 if (id
>= slots
->nmemslots
)
640 slots
->nmemslots
= id
+ 1;
647 * Allocate some memory and give it an address in the guest physical address
650 * Discontiguous memory is allowed, mostly for framebuffers.
652 * Must be called holding mmap_sem for write.
654 int __kvm_set_memory_region(struct kvm
*kvm
,
655 struct kvm_userspace_memory_region
*mem
,
660 unsigned long npages
;
662 struct kvm_memory_slot
*memslot
;
663 struct kvm_memory_slot old
, new;
664 struct kvm_memslots
*slots
, *old_memslots
;
667 /* General sanity checks */
668 if (mem
->memory_size
& (PAGE_SIZE
- 1))
670 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
672 /* We can read the guest memory with __xxx_user() later on. */
674 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
675 !access_ok(VERIFY_WRITE
,
676 (void __user
*)(unsigned long)mem
->userspace_addr
,
679 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
681 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
684 memslot
= &kvm
->memslots
->memslots
[mem
->slot
];
685 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
686 npages
= mem
->memory_size
>> PAGE_SHIFT
;
689 if (npages
> KVM_MEM_MAX_NR_PAGES
)
693 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
695 new = old
= *memslot
;
698 new.base_gfn
= base_gfn
;
700 new.flags
= mem
->flags
;
702 /* Disallow changing a memory slot's size. */
704 if (npages
&& old
.npages
&& npages
!= old
.npages
)
707 /* Check for overlaps */
709 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
710 struct kvm_memory_slot
*s
= &kvm
->memslots
->memslots
[i
];
712 if (s
== memslot
|| !s
->npages
)
714 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
715 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
719 /* Free page dirty bitmap if unneeded */
720 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
721 new.dirty_bitmap
= NULL
;
725 /* Allocate if a slot is being created */
727 if (npages
&& !new.rmap
) {
728 new.rmap
= vzalloc(npages
* sizeof(*new.rmap
));
733 new.user_alloc
= user_alloc
;
734 new.userspace_addr
= mem
->userspace_addr
;
739 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
745 /* Avoid unused variable warning if no large pages */
748 if (new.lpage_info
[i
])
751 lpages
= 1 + ((base_gfn
+ npages
- 1)
752 >> KVM_HPAGE_GFN_SHIFT(level
));
753 lpages
-= base_gfn
>> KVM_HPAGE_GFN_SHIFT(level
);
755 new.lpage_info
[i
] = vzalloc(lpages
* sizeof(*new.lpage_info
[i
]));
757 if (!new.lpage_info
[i
])
760 if (base_gfn
& (KVM_PAGES_PER_HPAGE(level
) - 1))
761 new.lpage_info
[i
][0].write_count
= 1;
762 if ((base_gfn
+npages
) & (KVM_PAGES_PER_HPAGE(level
) - 1))
763 new.lpage_info
[i
][lpages
- 1].write_count
= 1;
764 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
766 * If the gfn and userspace address are not aligned wrt each
767 * other, or if explicitly asked to, disable large page
768 * support for this slot
770 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
772 for (j
= 0; j
< lpages
; ++j
)
773 new.lpage_info
[i
][j
].write_count
= 1;
778 /* Allocate page dirty bitmap if needed */
779 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
780 if (kvm_create_dirty_bitmap(&new) < 0)
782 /* destroy any largepage mappings for dirty tracking */
784 #else /* not defined CONFIG_S390 */
785 new.user_alloc
= user_alloc
;
787 new.userspace_addr
= mem
->userspace_addr
;
788 #endif /* not defined CONFIG_S390 */
792 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
796 slots
->memslots
[mem
->slot
].flags
|= KVM_MEMSLOT_INVALID
;
797 update_memslots(slots
, NULL
);
799 old_memslots
= kvm
->memslots
;
800 rcu_assign_pointer(kvm
->memslots
, slots
);
801 synchronize_srcu_expedited(&kvm
->srcu
);
802 /* From this point no new shadow pages pointing to a deleted
803 * memslot will be created.
805 * validation of sp->gfn happens in:
806 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
807 * - kvm_is_visible_gfn (mmu_check_roots)
809 kvm_arch_flush_shadow(kvm
);
813 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
817 /* map the pages in iommu page table */
819 r
= kvm_iommu_map_pages(kvm
, &new);
825 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
830 /* actual memory is freed via old in kvm_free_physmem_slot below */
833 new.dirty_bitmap
= NULL
;
834 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
)
835 new.lpage_info
[i
] = NULL
;
838 update_memslots(slots
, &new);
839 old_memslots
= kvm
->memslots
;
840 rcu_assign_pointer(kvm
->memslots
, slots
);
841 synchronize_srcu_expedited(&kvm
->srcu
);
843 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
846 * If the new memory slot is created, we need to clear all
849 if (npages
&& old
.base_gfn
!= mem
->guest_phys_addr
>> PAGE_SHIFT
)
850 kvm_arch_flush_shadow(kvm
);
852 kvm_free_physmem_slot(&old
, &new);
858 kvm_free_physmem_slot(&new, &old
);
863 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
865 int kvm_set_memory_region(struct kvm
*kvm
,
866 struct kvm_userspace_memory_region
*mem
,
871 mutex_lock(&kvm
->slots_lock
);
872 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
873 mutex_unlock(&kvm
->slots_lock
);
876 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
878 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
880 kvm_userspace_memory_region
*mem
,
883 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
885 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
888 int kvm_get_dirty_log(struct kvm
*kvm
,
889 struct kvm_dirty_log
*log
, int *is_dirty
)
891 struct kvm_memory_slot
*memslot
;
894 unsigned long any
= 0;
897 if (log
->slot
>= KVM_MEMORY_SLOTS
)
900 memslot
= &kvm
->memslots
->memslots
[log
->slot
];
902 if (!memslot
->dirty_bitmap
)
905 n
= kvm_dirty_bitmap_bytes(memslot
);
907 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
908 any
= memslot
->dirty_bitmap
[i
];
911 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
922 void kvm_disable_largepages(void)
924 largepages_enabled
= false;
926 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
928 int is_error_page(struct page
*page
)
930 return page
== bad_page
|| page
== hwpoison_page
|| page
== fault_page
;
932 EXPORT_SYMBOL_GPL(is_error_page
);
934 int is_error_pfn(pfn_t pfn
)
936 return pfn
== bad_pfn
|| pfn
== hwpoison_pfn
|| pfn
== fault_pfn
;
938 EXPORT_SYMBOL_GPL(is_error_pfn
);
940 int is_hwpoison_pfn(pfn_t pfn
)
942 return pfn
== hwpoison_pfn
;
944 EXPORT_SYMBOL_GPL(is_hwpoison_pfn
);
946 int is_fault_pfn(pfn_t pfn
)
948 return pfn
== fault_pfn
;
950 EXPORT_SYMBOL_GPL(is_fault_pfn
);
952 int is_noslot_pfn(pfn_t pfn
)
954 return pfn
== bad_pfn
;
956 EXPORT_SYMBOL_GPL(is_noslot_pfn
);
958 int is_invalid_pfn(pfn_t pfn
)
960 return pfn
== hwpoison_pfn
|| pfn
== fault_pfn
;
962 EXPORT_SYMBOL_GPL(is_invalid_pfn
);
964 static inline unsigned long bad_hva(void)
969 int kvm_is_error_hva(unsigned long addr
)
971 return addr
== bad_hva();
973 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
975 static struct kvm_memory_slot
*__gfn_to_memslot(struct kvm_memslots
*slots
,
980 for (i
= 0; i
< slots
->nmemslots
; ++i
) {
981 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
983 if (gfn
>= memslot
->base_gfn
984 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
990 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
992 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
994 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
996 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
999 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1001 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1002 struct kvm_memory_slot
*memslot
= &slots
->memslots
[i
];
1004 if (memslot
->flags
& KVM_MEMSLOT_INVALID
)
1007 if (gfn
>= memslot
->base_gfn
1008 && gfn
< memslot
->base_gfn
+ memslot
->npages
)
1013 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1015 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1017 struct vm_area_struct
*vma
;
1018 unsigned long addr
, size
;
1022 addr
= gfn_to_hva(kvm
, gfn
);
1023 if (kvm_is_error_hva(addr
))
1026 down_read(¤t
->mm
->mmap_sem
);
1027 vma
= find_vma(current
->mm
, addr
);
1031 size
= vma_kernel_pagesize(vma
);
1034 up_read(¤t
->mm
->mmap_sem
);
1039 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1042 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1046 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1048 return gfn_to_hva_memslot(slot
, gfn
);
1051 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1053 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1055 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1057 static pfn_t
get_fault_pfn(void)
1059 get_page(fault_page
);
1063 int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1064 unsigned long start
, int write
, struct page
**page
)
1066 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1069 flags
|= FOLL_WRITE
;
1071 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1074 static inline int check_user_page_hwpoison(unsigned long addr
)
1076 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1078 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1079 flags
, NULL
, NULL
, NULL
);
1080 return rc
== -EHWPOISON
;
1083 static pfn_t
hva_to_pfn(struct kvm
*kvm
, unsigned long addr
, bool atomic
,
1084 bool *async
, bool write_fault
, bool *writable
)
1086 struct page
*page
[1];
1090 /* we can do it either atomically or asynchronously, not both */
1091 BUG_ON(atomic
&& async
);
1093 BUG_ON(!write_fault
&& !writable
);
1098 if (atomic
|| async
)
1099 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1101 if (unlikely(npages
!= 1) && !atomic
) {
1105 *writable
= write_fault
;
1108 down_read(¤t
->mm
->mmap_sem
);
1109 npages
= get_user_page_nowait(current
, current
->mm
,
1110 addr
, write_fault
, page
);
1111 up_read(¤t
->mm
->mmap_sem
);
1113 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1116 /* map read fault as writable if possible */
1117 if (unlikely(!write_fault
) && npages
== 1) {
1118 struct page
*wpage
[1];
1120 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1130 if (unlikely(npages
!= 1)) {
1131 struct vm_area_struct
*vma
;
1134 return get_fault_pfn();
1136 down_read(¤t
->mm
->mmap_sem
);
1137 if (npages
== -EHWPOISON
||
1138 (!async
&& check_user_page_hwpoison(addr
))) {
1139 up_read(¤t
->mm
->mmap_sem
);
1140 get_page(hwpoison_page
);
1141 return page_to_pfn(hwpoison_page
);
1144 vma
= find_vma_intersection(current
->mm
, addr
, addr
+1);
1147 pfn
= get_fault_pfn();
1148 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1149 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1151 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1153 if (async
&& (vma
->vm_flags
& VM_WRITE
))
1155 pfn
= get_fault_pfn();
1157 up_read(¤t
->mm
->mmap_sem
);
1159 pfn
= page_to_pfn(page
[0]);
1164 pfn_t
hva_to_pfn_atomic(struct kvm
*kvm
, unsigned long addr
)
1166 return hva_to_pfn(kvm
, addr
, true, NULL
, true, NULL
);
1168 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic
);
1170 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1171 bool write_fault
, bool *writable
)
1178 addr
= gfn_to_hva(kvm
, gfn
);
1179 if (kvm_is_error_hva(addr
)) {
1181 return page_to_pfn(bad_page
);
1184 return hva_to_pfn(kvm
, addr
, atomic
, async
, write_fault
, writable
);
1187 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1189 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1191 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1193 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1194 bool write_fault
, bool *writable
)
1196 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1198 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1200 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1202 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1204 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1206 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1209 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1211 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1213 pfn_t
gfn_to_pfn_memslot(struct kvm
*kvm
,
1214 struct kvm_memory_slot
*slot
, gfn_t gfn
)
1216 unsigned long addr
= gfn_to_hva_memslot(slot
, gfn
);
1217 return hva_to_pfn(kvm
, addr
, false, NULL
, true, NULL
);
1220 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1226 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1227 if (kvm_is_error_hva(addr
))
1230 if (entry
< nr_pages
)
1233 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1235 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1237 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1241 pfn
= gfn_to_pfn(kvm
, gfn
);
1242 if (!kvm_is_mmio_pfn(pfn
))
1243 return pfn_to_page(pfn
);
1245 WARN_ON(kvm_is_mmio_pfn(pfn
));
1251 EXPORT_SYMBOL_GPL(gfn_to_page
);
1253 void kvm_release_page_clean(struct page
*page
)
1255 kvm_release_pfn_clean(page_to_pfn(page
));
1257 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1259 void kvm_release_pfn_clean(pfn_t pfn
)
1261 if (!kvm_is_mmio_pfn(pfn
))
1262 put_page(pfn_to_page(pfn
));
1264 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1266 void kvm_release_page_dirty(struct page
*page
)
1268 kvm_release_pfn_dirty(page_to_pfn(page
));
1270 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1272 void kvm_release_pfn_dirty(pfn_t pfn
)
1274 kvm_set_pfn_dirty(pfn
);
1275 kvm_release_pfn_clean(pfn
);
1277 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1279 void kvm_set_page_dirty(struct page
*page
)
1281 kvm_set_pfn_dirty(page_to_pfn(page
));
1283 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1285 void kvm_set_pfn_dirty(pfn_t pfn
)
1287 if (!kvm_is_mmio_pfn(pfn
)) {
1288 struct page
*page
= pfn_to_page(pfn
);
1289 if (!PageReserved(page
))
1293 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1295 void kvm_set_pfn_accessed(pfn_t pfn
)
1297 if (!kvm_is_mmio_pfn(pfn
))
1298 mark_page_accessed(pfn_to_page(pfn
));
1300 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1302 void kvm_get_pfn(pfn_t pfn
)
1304 if (!kvm_is_mmio_pfn(pfn
))
1305 get_page(pfn_to_page(pfn
));
1307 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1309 static int next_segment(unsigned long len
, int offset
)
1311 if (len
> PAGE_SIZE
- offset
)
1312 return PAGE_SIZE
- offset
;
1317 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1323 addr
= gfn_to_hva(kvm
, gfn
);
1324 if (kvm_is_error_hva(addr
))
1326 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1331 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1333 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1335 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1337 int offset
= offset_in_page(gpa
);
1340 while ((seg
= next_segment(len
, offset
)) != 0) {
1341 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1351 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1353 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1358 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1359 int offset
= offset_in_page(gpa
);
1361 addr
= gfn_to_hva(kvm
, gfn
);
1362 if (kvm_is_error_hva(addr
))
1364 pagefault_disable();
1365 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1371 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1373 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1374 int offset
, int len
)
1379 addr
= gfn_to_hva(kvm
, gfn
);
1380 if (kvm_is_error_hva(addr
))
1382 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1385 mark_page_dirty(kvm
, gfn
);
1388 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1390 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1393 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1395 int offset
= offset_in_page(gpa
);
1398 while ((seg
= next_segment(len
, offset
)) != 0) {
1399 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1410 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1413 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1414 int offset
= offset_in_page(gpa
);
1415 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1418 ghc
->generation
= slots
->generation
;
1419 ghc
->memslot
= __gfn_to_memslot(slots
, gfn
);
1420 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, gfn
, NULL
);
1421 if (!kvm_is_error_hva(ghc
->hva
))
1428 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1430 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1431 void *data
, unsigned long len
)
1433 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1436 if (slots
->generation
!= ghc
->generation
)
1437 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1439 if (kvm_is_error_hva(ghc
->hva
))
1442 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1445 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1449 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1451 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1452 void *data
, unsigned long len
)
1454 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1457 if (slots
->generation
!= ghc
->generation
)
1458 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1460 if (kvm_is_error_hva(ghc
->hva
))
1463 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1469 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1471 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1473 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1476 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1478 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1480 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1482 int offset
= offset_in_page(gpa
);
1485 while ((seg
= next_segment(len
, offset
)) != 0) {
1486 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1495 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1497 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1500 if (memslot
&& memslot
->dirty_bitmap
) {
1501 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1503 if (!__test_and_set_bit_le(rel_gfn
, memslot
->dirty_bitmap
))
1504 memslot
->nr_dirty_pages
++;
1508 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1510 struct kvm_memory_slot
*memslot
;
1512 memslot
= gfn_to_memslot(kvm
, gfn
);
1513 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1517 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1519 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1524 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1526 if (kvm_arch_vcpu_runnable(vcpu
)) {
1527 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1530 if (kvm_cpu_has_pending_timer(vcpu
))
1532 if (signal_pending(current
))
1538 finish_wait(&vcpu
->wq
, &wait
);
1541 void kvm_resched(struct kvm_vcpu
*vcpu
)
1543 if (!need_resched())
1547 EXPORT_SYMBOL_GPL(kvm_resched
);
1549 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1551 struct kvm
*kvm
= me
->kvm
;
1552 struct kvm_vcpu
*vcpu
;
1553 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1559 * We boost the priority of a VCPU that is runnable but not
1560 * currently running, because it got preempted by something
1561 * else and called schedule in __vcpu_run. Hopefully that
1562 * VCPU is holding the lock that we need and will release it.
1563 * We approximate round-robin by starting at the last boosted VCPU.
1565 for (pass
= 0; pass
< 2 && !yielded
; pass
++) {
1566 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1567 struct task_struct
*task
= NULL
;
1569 if (!pass
&& i
< last_boosted_vcpu
) {
1570 i
= last_boosted_vcpu
;
1572 } else if (pass
&& i
> last_boosted_vcpu
)
1576 if (waitqueue_active(&vcpu
->wq
))
1579 pid
= rcu_dereference(vcpu
->pid
);
1581 task
= get_pid_task(vcpu
->pid
, PIDTYPE_PID
);
1585 if (task
->flags
& PF_VCPU
) {
1586 put_task_struct(task
);
1589 if (yield_to(task
, 1)) {
1590 put_task_struct(task
);
1591 kvm
->last_boosted_vcpu
= i
;
1595 put_task_struct(task
);
1599 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1601 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1603 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1606 if (vmf
->pgoff
== 0)
1607 page
= virt_to_page(vcpu
->run
);
1609 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1610 page
= virt_to_page(vcpu
->arch
.pio_data
);
1612 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1613 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1614 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1617 return VM_FAULT_SIGBUS
;
1623 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1624 .fault
= kvm_vcpu_fault
,
1627 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1629 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1633 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1635 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1637 kvm_put_kvm(vcpu
->kvm
);
1641 static struct file_operations kvm_vcpu_fops
= {
1642 .release
= kvm_vcpu_release
,
1643 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1644 #ifdef CONFIG_COMPAT
1645 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1647 .mmap
= kvm_vcpu_mmap
,
1648 .llseek
= noop_llseek
,
1652 * Allocates an inode for the vcpu.
1654 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1656 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1660 * Creates some virtual cpus. Good luck creating more than one.
1662 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1665 struct kvm_vcpu
*vcpu
, *v
;
1667 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1669 return PTR_ERR(vcpu
);
1671 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1673 r
= kvm_arch_vcpu_setup(vcpu
);
1677 mutex_lock(&kvm
->lock
);
1678 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1680 goto unlock_vcpu_destroy
;
1683 kvm_for_each_vcpu(r
, v
, kvm
)
1684 if (v
->vcpu_id
== id
) {
1686 goto unlock_vcpu_destroy
;
1689 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1691 /* Now it's all set up, let userspace reach it */
1693 r
= create_vcpu_fd(vcpu
);
1696 goto unlock_vcpu_destroy
;
1699 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1701 atomic_inc(&kvm
->online_vcpus
);
1703 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1704 if (kvm
->bsp_vcpu_id
== id
)
1705 kvm
->bsp_vcpu
= vcpu
;
1707 mutex_unlock(&kvm
->lock
);
1710 unlock_vcpu_destroy
:
1711 mutex_unlock(&kvm
->lock
);
1713 kvm_arch_vcpu_destroy(vcpu
);
1717 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1720 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1721 vcpu
->sigset_active
= 1;
1722 vcpu
->sigset
= *sigset
;
1724 vcpu
->sigset_active
= 0;
1728 static long kvm_vcpu_ioctl(struct file
*filp
,
1729 unsigned int ioctl
, unsigned long arg
)
1731 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1732 void __user
*argp
= (void __user
*)arg
;
1734 struct kvm_fpu
*fpu
= NULL
;
1735 struct kvm_sregs
*kvm_sregs
= NULL
;
1737 if (vcpu
->kvm
->mm
!= current
->mm
)
1740 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1742 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1743 * so vcpu_load() would break it.
1745 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1746 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1756 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1757 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1759 case KVM_GET_REGS
: {
1760 struct kvm_regs
*kvm_regs
;
1763 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1766 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1770 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1777 case KVM_SET_REGS
: {
1778 struct kvm_regs
*kvm_regs
;
1781 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1785 if (copy_from_user(kvm_regs
, argp
, sizeof(struct kvm_regs
)))
1787 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1795 case KVM_GET_SREGS
: {
1796 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1800 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1804 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1809 case KVM_SET_SREGS
: {
1810 kvm_sregs
= kmalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1815 if (copy_from_user(kvm_sregs
, argp
, sizeof(struct kvm_sregs
)))
1817 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1823 case KVM_GET_MP_STATE
: {
1824 struct kvm_mp_state mp_state
;
1826 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1830 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1835 case KVM_SET_MP_STATE
: {
1836 struct kvm_mp_state mp_state
;
1839 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1841 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1847 case KVM_TRANSLATE
: {
1848 struct kvm_translation tr
;
1851 if (copy_from_user(&tr
, argp
, sizeof tr
))
1853 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1857 if (copy_to_user(argp
, &tr
, sizeof tr
))
1862 case KVM_SET_GUEST_DEBUG
: {
1863 struct kvm_guest_debug dbg
;
1866 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1868 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1874 case KVM_SET_SIGNAL_MASK
: {
1875 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1876 struct kvm_signal_mask kvm_sigmask
;
1877 sigset_t sigset
, *p
;
1882 if (copy_from_user(&kvm_sigmask
, argp
,
1883 sizeof kvm_sigmask
))
1886 if (kvm_sigmask
.len
!= sizeof sigset
)
1889 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1894 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
1898 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1902 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1906 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1912 fpu
= kmalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1917 if (copy_from_user(fpu
, argp
, sizeof(struct kvm_fpu
)))
1919 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1926 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1935 #ifdef CONFIG_COMPAT
1936 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
1937 unsigned int ioctl
, unsigned long arg
)
1939 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1940 void __user
*argp
= compat_ptr(arg
);
1943 if (vcpu
->kvm
->mm
!= current
->mm
)
1947 case KVM_SET_SIGNAL_MASK
: {
1948 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1949 struct kvm_signal_mask kvm_sigmask
;
1950 compat_sigset_t csigset
;
1955 if (copy_from_user(&kvm_sigmask
, argp
,
1956 sizeof kvm_sigmask
))
1959 if (kvm_sigmask
.len
!= sizeof csigset
)
1962 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
1966 sigset_from_compat(&sigset
, &csigset
);
1967 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1971 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
1979 static long kvm_vm_ioctl(struct file
*filp
,
1980 unsigned int ioctl
, unsigned long arg
)
1982 struct kvm
*kvm
= filp
->private_data
;
1983 void __user
*argp
= (void __user
*)arg
;
1986 if (kvm
->mm
!= current
->mm
)
1989 case KVM_CREATE_VCPU
:
1990 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1994 case KVM_SET_USER_MEMORY_REGION
: {
1995 struct kvm_userspace_memory_region kvm_userspace_mem
;
1998 if (copy_from_user(&kvm_userspace_mem
, argp
,
1999 sizeof kvm_userspace_mem
))
2002 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
2007 case KVM_GET_DIRTY_LOG
: {
2008 struct kvm_dirty_log log
;
2011 if (copy_from_user(&log
, argp
, sizeof log
))
2013 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2018 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2019 case KVM_REGISTER_COALESCED_MMIO
: {
2020 struct kvm_coalesced_mmio_zone zone
;
2022 if (copy_from_user(&zone
, argp
, sizeof zone
))
2024 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2030 case KVM_UNREGISTER_COALESCED_MMIO
: {
2031 struct kvm_coalesced_mmio_zone zone
;
2033 if (copy_from_user(&zone
, argp
, sizeof zone
))
2035 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2043 struct kvm_irqfd data
;
2046 if (copy_from_user(&data
, argp
, sizeof data
))
2048 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
2051 case KVM_IOEVENTFD
: {
2052 struct kvm_ioeventfd data
;
2055 if (copy_from_user(&data
, argp
, sizeof data
))
2057 r
= kvm_ioeventfd(kvm
, &data
);
2060 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2061 case KVM_SET_BOOT_CPU_ID
:
2063 mutex_lock(&kvm
->lock
);
2064 if (atomic_read(&kvm
->online_vcpus
) != 0)
2067 kvm
->bsp_vcpu_id
= arg
;
2068 mutex_unlock(&kvm
->lock
);
2072 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2074 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2080 #ifdef CONFIG_COMPAT
2081 struct compat_kvm_dirty_log
{
2085 compat_uptr_t dirty_bitmap
; /* one bit per page */
2090 static long kvm_vm_compat_ioctl(struct file
*filp
,
2091 unsigned int ioctl
, unsigned long arg
)
2093 struct kvm
*kvm
= filp
->private_data
;
2096 if (kvm
->mm
!= current
->mm
)
2099 case KVM_GET_DIRTY_LOG
: {
2100 struct compat_kvm_dirty_log compat_log
;
2101 struct kvm_dirty_log log
;
2104 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2105 sizeof(compat_log
)))
2107 log
.slot
= compat_log
.slot
;
2108 log
.padding1
= compat_log
.padding1
;
2109 log
.padding2
= compat_log
.padding2
;
2110 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2112 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2118 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2126 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2128 struct page
*page
[1];
2131 gfn_t gfn
= vmf
->pgoff
;
2132 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2134 addr
= gfn_to_hva(kvm
, gfn
);
2135 if (kvm_is_error_hva(addr
))
2136 return VM_FAULT_SIGBUS
;
2138 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2140 if (unlikely(npages
!= 1))
2141 return VM_FAULT_SIGBUS
;
2143 vmf
->page
= page
[0];
2147 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2148 .fault
= kvm_vm_fault
,
2151 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2153 vma
->vm_ops
= &kvm_vm_vm_ops
;
2157 static struct file_operations kvm_vm_fops
= {
2158 .release
= kvm_vm_release
,
2159 .unlocked_ioctl
= kvm_vm_ioctl
,
2160 #ifdef CONFIG_COMPAT
2161 .compat_ioctl
= kvm_vm_compat_ioctl
,
2163 .mmap
= kvm_vm_mmap
,
2164 .llseek
= noop_llseek
,
2167 static int kvm_dev_ioctl_create_vm(void)
2172 kvm
= kvm_create_vm();
2174 return PTR_ERR(kvm
);
2175 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2176 r
= kvm_coalesced_mmio_init(kvm
);
2182 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2189 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2192 case KVM_CAP_USER_MEMORY
:
2193 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2194 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2195 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2196 case KVM_CAP_SET_BOOT_CPU_ID
:
2198 case KVM_CAP_INTERNAL_ERROR_DATA
:
2200 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2201 case KVM_CAP_IRQ_ROUTING
:
2202 return KVM_MAX_IRQ_ROUTES
;
2207 return kvm_dev_ioctl_check_extension(arg
);
2210 static long kvm_dev_ioctl(struct file
*filp
,
2211 unsigned int ioctl
, unsigned long arg
)
2216 case KVM_GET_API_VERSION
:
2220 r
= KVM_API_VERSION
;
2226 r
= kvm_dev_ioctl_create_vm();
2228 case KVM_CHECK_EXTENSION
:
2229 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2231 case KVM_GET_VCPU_MMAP_SIZE
:
2235 r
= PAGE_SIZE
; /* struct kvm_run */
2237 r
+= PAGE_SIZE
; /* pio data page */
2239 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2240 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2243 case KVM_TRACE_ENABLE
:
2244 case KVM_TRACE_PAUSE
:
2245 case KVM_TRACE_DISABLE
:
2249 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2255 static struct file_operations kvm_chardev_ops
= {
2256 .unlocked_ioctl
= kvm_dev_ioctl
,
2257 .compat_ioctl
= kvm_dev_ioctl
,
2258 .llseek
= noop_llseek
,
2261 static struct miscdevice kvm_dev
= {
2267 static void hardware_enable_nolock(void *junk
)
2269 int cpu
= raw_smp_processor_id();
2272 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2275 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2277 r
= kvm_arch_hardware_enable(NULL
);
2280 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2281 atomic_inc(&hardware_enable_failed
);
2282 printk(KERN_INFO
"kvm: enabling virtualization on "
2283 "CPU%d failed\n", cpu
);
2287 static void hardware_enable(void *junk
)
2289 raw_spin_lock(&kvm_lock
);
2290 hardware_enable_nolock(junk
);
2291 raw_spin_unlock(&kvm_lock
);
2294 static void hardware_disable_nolock(void *junk
)
2296 int cpu
= raw_smp_processor_id();
2298 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2300 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2301 kvm_arch_hardware_disable(NULL
);
2304 static void hardware_disable(void *junk
)
2306 raw_spin_lock(&kvm_lock
);
2307 hardware_disable_nolock(junk
);
2308 raw_spin_unlock(&kvm_lock
);
2311 static void hardware_disable_all_nolock(void)
2313 BUG_ON(!kvm_usage_count
);
2316 if (!kvm_usage_count
)
2317 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2320 static void hardware_disable_all(void)
2322 raw_spin_lock(&kvm_lock
);
2323 hardware_disable_all_nolock();
2324 raw_spin_unlock(&kvm_lock
);
2327 static int hardware_enable_all(void)
2331 raw_spin_lock(&kvm_lock
);
2334 if (kvm_usage_count
== 1) {
2335 atomic_set(&hardware_enable_failed
, 0);
2336 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2338 if (atomic_read(&hardware_enable_failed
)) {
2339 hardware_disable_all_nolock();
2344 raw_spin_unlock(&kvm_lock
);
2349 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2354 if (!kvm_usage_count
)
2357 val
&= ~CPU_TASKS_FROZEN
;
2360 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2362 hardware_disable(NULL
);
2365 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2367 hardware_enable(NULL
);
2374 asmlinkage
void kvm_spurious_fault(void)
2376 /* Fault while not rebooting. We want the trace. */
2379 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
2381 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2385 * Some (well, at least mine) BIOSes hang on reboot if
2388 * And Intel TXT required VMX off for all cpu when system shutdown.
2390 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2391 kvm_rebooting
= true;
2392 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2396 static struct notifier_block kvm_reboot_notifier
= {
2397 .notifier_call
= kvm_reboot
,
2401 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2405 for (i
= 0; i
< bus
->dev_count
; i
++) {
2406 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2408 kvm_iodevice_destructor(pos
);
2413 int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2415 const struct kvm_io_range
*r1
= p1
;
2416 const struct kvm_io_range
*r2
= p2
;
2418 if (r1
->addr
< r2
->addr
)
2420 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2425 int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2426 gpa_t addr
, int len
)
2428 if (bus
->dev_count
== NR_IOBUS_DEVS
)
2431 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2437 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2438 kvm_io_bus_sort_cmp
, NULL
);
2443 int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2444 gpa_t addr
, int len
)
2446 struct kvm_io_range
*range
, key
;
2449 key
= (struct kvm_io_range
) {
2454 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2455 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2459 off
= range
- bus
->range
;
2461 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2467 /* kvm_io_bus_write - called under kvm->slots_lock */
2468 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2469 int len
, const void *val
)
2472 struct kvm_io_bus
*bus
;
2473 struct kvm_io_range range
;
2475 range
= (struct kvm_io_range
) {
2480 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2481 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2485 while (idx
< bus
->dev_count
&&
2486 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2487 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2495 /* kvm_io_bus_read - called under kvm->slots_lock */
2496 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2500 struct kvm_io_bus
*bus
;
2501 struct kvm_io_range range
;
2503 range
= (struct kvm_io_range
) {
2508 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2509 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2513 while (idx
< bus
->dev_count
&&
2514 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2515 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2523 /* Caller must hold slots_lock. */
2524 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2525 int len
, struct kvm_io_device
*dev
)
2527 struct kvm_io_bus
*new_bus
, *bus
;
2529 bus
= kvm
->buses
[bus_idx
];
2530 if (bus
->dev_count
> NR_IOBUS_DEVS
-1)
2533 new_bus
= kmemdup(bus
, sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2536 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2537 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2538 synchronize_srcu_expedited(&kvm
->srcu
);
2544 /* Caller must hold slots_lock. */
2545 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2546 struct kvm_io_device
*dev
)
2549 struct kvm_io_bus
*new_bus
, *bus
;
2551 new_bus
= kzalloc(sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2555 bus
= kvm
->buses
[bus_idx
];
2556 memcpy(new_bus
, bus
, sizeof(struct kvm_io_bus
));
2559 for (i
= 0; i
< new_bus
->dev_count
; i
++)
2560 if (new_bus
->range
[i
].dev
== dev
) {
2562 new_bus
->dev_count
--;
2563 new_bus
->range
[i
] = new_bus
->range
[new_bus
->dev_count
];
2564 sort(new_bus
->range
, new_bus
->dev_count
,
2565 sizeof(struct kvm_io_range
),
2566 kvm_io_bus_sort_cmp
, NULL
);
2575 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2576 synchronize_srcu_expedited(&kvm
->srcu
);
2581 static struct notifier_block kvm_cpu_notifier
= {
2582 .notifier_call
= kvm_cpu_hotplug
,
2585 static int vm_stat_get(void *_offset
, u64
*val
)
2587 unsigned offset
= (long)_offset
;
2591 raw_spin_lock(&kvm_lock
);
2592 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2593 *val
+= *(u32
*)((void *)kvm
+ offset
);
2594 raw_spin_unlock(&kvm_lock
);
2598 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2600 static int vcpu_stat_get(void *_offset
, u64
*val
)
2602 unsigned offset
= (long)_offset
;
2604 struct kvm_vcpu
*vcpu
;
2608 raw_spin_lock(&kvm_lock
);
2609 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2610 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2611 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2613 raw_spin_unlock(&kvm_lock
);
2617 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2619 static const struct file_operations
*stat_fops
[] = {
2620 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2621 [KVM_STAT_VM
] = &vm_stat_fops
,
2624 static void kvm_init_debug(void)
2626 struct kvm_stats_debugfs_item
*p
;
2628 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2629 for (p
= debugfs_entries
; p
->name
; ++p
)
2630 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2631 (void *)(long)p
->offset
,
2632 stat_fops
[p
->kind
]);
2635 static void kvm_exit_debug(void)
2637 struct kvm_stats_debugfs_item
*p
;
2639 for (p
= debugfs_entries
; p
->name
; ++p
)
2640 debugfs_remove(p
->dentry
);
2641 debugfs_remove(kvm_debugfs_dir
);
2644 static int kvm_suspend(void)
2646 if (kvm_usage_count
)
2647 hardware_disable_nolock(NULL
);
2651 static void kvm_resume(void)
2653 if (kvm_usage_count
) {
2654 WARN_ON(raw_spin_is_locked(&kvm_lock
));
2655 hardware_enable_nolock(NULL
);
2659 static struct syscore_ops kvm_syscore_ops
= {
2660 .suspend
= kvm_suspend
,
2661 .resume
= kvm_resume
,
2664 struct page
*bad_page
;
2668 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2670 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2673 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2675 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2677 kvm_arch_vcpu_load(vcpu
, cpu
);
2680 static void kvm_sched_out(struct preempt_notifier
*pn
,
2681 struct task_struct
*next
)
2683 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2685 kvm_arch_vcpu_put(vcpu
);
2688 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2689 struct module
*module
)
2694 r
= kvm_arch_init(opaque
);
2698 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2700 if (bad_page
== NULL
) {
2705 bad_pfn
= page_to_pfn(bad_page
);
2707 hwpoison_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2709 if (hwpoison_page
== NULL
) {
2714 hwpoison_pfn
= page_to_pfn(hwpoison_page
);
2716 fault_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2718 if (fault_page
== NULL
) {
2723 fault_pfn
= page_to_pfn(fault_page
);
2725 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2730 r
= kvm_arch_hardware_setup();
2734 for_each_online_cpu(cpu
) {
2735 smp_call_function_single(cpu
,
2736 kvm_arch_check_processor_compat
,
2742 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2745 register_reboot_notifier(&kvm_reboot_notifier
);
2747 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2749 vcpu_align
= __alignof__(struct kvm_vcpu
);
2750 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2752 if (!kvm_vcpu_cache
) {
2757 r
= kvm_async_pf_init();
2761 kvm_chardev_ops
.owner
= module
;
2762 kvm_vm_fops
.owner
= module
;
2763 kvm_vcpu_fops
.owner
= module
;
2765 r
= misc_register(&kvm_dev
);
2767 printk(KERN_ERR
"kvm: misc device register failed\n");
2771 register_syscore_ops(&kvm_syscore_ops
);
2773 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2774 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2781 kvm_async_pf_deinit();
2783 kmem_cache_destroy(kvm_vcpu_cache
);
2785 unregister_reboot_notifier(&kvm_reboot_notifier
);
2786 unregister_cpu_notifier(&kvm_cpu_notifier
);
2789 kvm_arch_hardware_unsetup();
2791 free_cpumask_var(cpus_hardware_enabled
);
2794 __free_page(fault_page
);
2796 __free_page(hwpoison_page
);
2797 __free_page(bad_page
);
2803 EXPORT_SYMBOL_GPL(kvm_init
);
2808 misc_deregister(&kvm_dev
);
2809 kmem_cache_destroy(kvm_vcpu_cache
);
2810 kvm_async_pf_deinit();
2811 unregister_syscore_ops(&kvm_syscore_ops
);
2812 unregister_reboot_notifier(&kvm_reboot_notifier
);
2813 unregister_cpu_notifier(&kvm_cpu_notifier
);
2814 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2815 kvm_arch_hardware_unsetup();
2817 free_cpumask_var(cpus_hardware_enabled
);
2818 __free_page(hwpoison_page
);
2819 __free_page(bad_page
);
2821 EXPORT_SYMBOL_GPL(kvm_exit
);