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
++;
362 * The above sequence increase must be visible before the
363 * below count decrease, which is ensured by the smp_wmb above
364 * in conjunction with the smp_rmb in mmu_notifier_retry().
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 void kvm_init_memslots_id(struct kvm
*kvm
)
446 struct kvm_memslots
*slots
= kvm
->memslots
;
448 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
449 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
452 static struct kvm
*kvm_create_vm(unsigned long type
)
455 struct kvm
*kvm
= kvm_arch_alloc_vm();
458 return ERR_PTR(-ENOMEM
);
460 r
= kvm_arch_init_vm(kvm
, type
);
462 goto out_err_nodisable
;
464 r
= hardware_enable_all();
466 goto out_err_nodisable
;
468 #ifdef CONFIG_HAVE_KVM_IRQCHIP
469 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
470 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
474 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
477 kvm_init_memslots_id(kvm
);
478 if (init_srcu_struct(&kvm
->srcu
))
480 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
481 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
487 spin_lock_init(&kvm
->mmu_lock
);
488 kvm
->mm
= current
->mm
;
489 atomic_inc(&kvm
->mm
->mm_count
);
490 kvm_eventfd_init(kvm
);
491 mutex_init(&kvm
->lock
);
492 mutex_init(&kvm
->irq_lock
);
493 mutex_init(&kvm
->slots_lock
);
494 atomic_set(&kvm
->users_count
, 1);
496 r
= kvm_init_mmu_notifier(kvm
);
500 raw_spin_lock(&kvm_lock
);
501 list_add(&kvm
->vm_list
, &vm_list
);
502 raw_spin_unlock(&kvm_lock
);
507 cleanup_srcu_struct(&kvm
->srcu
);
509 hardware_disable_all();
511 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
512 kfree(kvm
->buses
[i
]);
513 kfree(kvm
->memslots
);
514 kvm_arch_free_vm(kvm
);
518 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
520 if (!memslot
->dirty_bitmap
)
523 if (2 * kvm_dirty_bitmap_bytes(memslot
) > PAGE_SIZE
)
524 vfree(memslot
->dirty_bitmap_head
);
526 kfree(memslot
->dirty_bitmap_head
);
528 memslot
->dirty_bitmap
= NULL
;
529 memslot
->dirty_bitmap_head
= NULL
;
533 * Free any memory in @free but not in @dont.
535 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
536 struct kvm_memory_slot
*dont
)
540 if (!dont
|| free
->rmap
!= dont
->rmap
)
543 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
544 kvm_destroy_dirty_bitmap(free
);
547 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
548 if (!dont
|| free
->lpage_info
[i
] != dont
->lpage_info
[i
]) {
549 vfree(free
->lpage_info
[i
]);
550 free
->lpage_info
[i
] = NULL
;
558 void kvm_free_physmem(struct kvm
*kvm
)
560 struct kvm_memslots
*slots
= kvm
->memslots
;
561 struct kvm_memory_slot
*memslot
;
563 kvm_for_each_memslot(memslot
, slots
)
564 kvm_free_physmem_slot(memslot
, NULL
);
566 kfree(kvm
->memslots
);
569 static void kvm_destroy_vm(struct kvm
*kvm
)
572 struct mm_struct
*mm
= kvm
->mm
;
574 kvm_arch_sync_events(kvm
);
575 raw_spin_lock(&kvm_lock
);
576 list_del(&kvm
->vm_list
);
577 raw_spin_unlock(&kvm_lock
);
578 kvm_free_irq_routing(kvm
);
579 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
580 kvm_io_bus_destroy(kvm
->buses
[i
]);
581 kvm_coalesced_mmio_free(kvm
);
582 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
583 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
585 kvm_arch_flush_shadow(kvm
);
587 kvm_arch_destroy_vm(kvm
);
588 kvm_free_physmem(kvm
);
589 cleanup_srcu_struct(&kvm
->srcu
);
590 kvm_arch_free_vm(kvm
);
591 hardware_disable_all();
595 void kvm_get_kvm(struct kvm
*kvm
)
597 atomic_inc(&kvm
->users_count
);
599 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
601 void kvm_put_kvm(struct kvm
*kvm
)
603 if (atomic_dec_and_test(&kvm
->users_count
))
606 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
609 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
611 struct kvm
*kvm
= filp
->private_data
;
613 kvm_irqfd_release(kvm
);
621 * Allocation size is twice as large as the actual dirty bitmap size.
622 * This makes it possible to do double buffering: see x86's
623 * kvm_vm_ioctl_get_dirty_log().
625 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
627 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
629 if (dirty_bytes
> PAGE_SIZE
)
630 memslot
->dirty_bitmap
= vzalloc(dirty_bytes
);
632 memslot
->dirty_bitmap
= kzalloc(dirty_bytes
, GFP_KERNEL
);
634 if (!memslot
->dirty_bitmap
)
637 memslot
->dirty_bitmap_head
= memslot
->dirty_bitmap
;
638 memslot
->nr_dirty_pages
= 0;
641 #endif /* !CONFIG_S390 */
643 static int cmp_memslot(const void *slot1
, const void *slot2
)
645 struct kvm_memory_slot
*s1
, *s2
;
647 s1
= (struct kvm_memory_slot
*)slot1
;
648 s2
= (struct kvm_memory_slot
*)slot2
;
650 if (s1
->npages
< s2
->npages
)
652 if (s1
->npages
> s2
->npages
)
659 * Sort the memslots base on its size, so the larger slots
660 * will get better fit.
662 static void sort_memslots(struct kvm_memslots
*slots
)
666 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
667 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
669 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
670 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
673 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
677 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
678 unsigned long npages
= old
->npages
;
681 if (new->npages
!= npages
)
682 sort_memslots(slots
);
689 * Allocate some memory and give it an address in the guest physical address
692 * Discontiguous memory is allowed, mostly for framebuffers.
694 * Must be called holding mmap_sem for write.
696 int __kvm_set_memory_region(struct kvm
*kvm
,
697 struct kvm_userspace_memory_region
*mem
,
702 unsigned long npages
;
704 struct kvm_memory_slot
*memslot
;
705 struct kvm_memory_slot old
, new;
706 struct kvm_memslots
*slots
, *old_memslots
;
709 /* General sanity checks */
710 if (mem
->memory_size
& (PAGE_SIZE
- 1))
712 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
714 /* We can read the guest memory with __xxx_user() later on. */
716 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
717 !access_ok(VERIFY_WRITE
,
718 (void __user
*)(unsigned long)mem
->userspace_addr
,
721 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
723 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
726 memslot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
727 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
728 npages
= mem
->memory_size
>> PAGE_SHIFT
;
731 if (npages
> KVM_MEM_MAX_NR_PAGES
)
735 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
737 new = old
= *memslot
;
740 new.base_gfn
= base_gfn
;
742 new.flags
= mem
->flags
;
744 /* Disallow changing a memory slot's size. */
746 if (npages
&& old
.npages
&& npages
!= old
.npages
)
749 /* Check for overlaps */
751 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
752 struct kvm_memory_slot
*s
= &kvm
->memslots
->memslots
[i
];
754 if (s
== memslot
|| !s
->npages
)
756 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
757 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
761 /* Free page dirty bitmap if unneeded */
762 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
763 new.dirty_bitmap
= NULL
;
767 /* Allocate if a slot is being created */
769 if (npages
&& !new.rmap
) {
770 new.rmap
= vzalloc(npages
* sizeof(*new.rmap
));
775 new.user_alloc
= user_alloc
;
776 new.userspace_addr
= mem
->userspace_addr
;
781 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
) {
787 /* Avoid unused variable warning if no large pages */
790 if (new.lpage_info
[i
])
793 lpages
= 1 + ((base_gfn
+ npages
- 1)
794 >> KVM_HPAGE_GFN_SHIFT(level
));
795 lpages
-= base_gfn
>> KVM_HPAGE_GFN_SHIFT(level
);
797 new.lpage_info
[i
] = vzalloc(lpages
* sizeof(*new.lpage_info
[i
]));
799 if (!new.lpage_info
[i
])
802 if (base_gfn
& (KVM_PAGES_PER_HPAGE(level
) - 1))
803 new.lpage_info
[i
][0].write_count
= 1;
804 if ((base_gfn
+npages
) & (KVM_PAGES_PER_HPAGE(level
) - 1))
805 new.lpage_info
[i
][lpages
- 1].write_count
= 1;
806 ugfn
= new.userspace_addr
>> PAGE_SHIFT
;
808 * If the gfn and userspace address are not aligned wrt each
809 * other, or if explicitly asked to, disable large page
810 * support for this slot
812 if ((base_gfn
^ ugfn
) & (KVM_PAGES_PER_HPAGE(level
) - 1) ||
814 for (j
= 0; j
< lpages
; ++j
)
815 new.lpage_info
[i
][j
].write_count
= 1;
820 /* Allocate page dirty bitmap if needed */
821 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
822 if (kvm_create_dirty_bitmap(&new) < 0)
824 /* destroy any largepage mappings for dirty tracking */
826 #else /* not defined CONFIG_S390 */
827 new.user_alloc
= user_alloc
;
829 new.userspace_addr
= mem
->userspace_addr
;
830 #endif /* not defined CONFIG_S390 */
833 struct kvm_memory_slot
*slot
;
836 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
840 slot
= id_to_memslot(slots
, mem
->slot
);
841 slot
->flags
|= KVM_MEMSLOT_INVALID
;
843 update_memslots(slots
, NULL
);
845 old_memslots
= kvm
->memslots
;
846 rcu_assign_pointer(kvm
->memslots
, slots
);
847 synchronize_srcu_expedited(&kvm
->srcu
);
848 /* From this point no new shadow pages pointing to a deleted
849 * memslot will be created.
851 * validation of sp->gfn happens in:
852 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
853 * - kvm_is_visible_gfn (mmu_check_roots)
855 kvm_arch_flush_shadow(kvm
);
859 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
863 /* map the pages in iommu page table */
865 r
= kvm_iommu_map_pages(kvm
, &new);
871 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
876 /* actual memory is freed via old in kvm_free_physmem_slot below */
879 new.dirty_bitmap
= NULL
;
880 for (i
= 0; i
< KVM_NR_PAGE_SIZES
- 1; ++i
)
881 new.lpage_info
[i
] = NULL
;
884 update_memslots(slots
, &new);
885 old_memslots
= kvm
->memslots
;
886 rcu_assign_pointer(kvm
->memslots
, slots
);
887 synchronize_srcu_expedited(&kvm
->srcu
);
889 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
892 * If the new memory slot is created, we need to clear all
895 if (npages
&& old
.base_gfn
!= mem
->guest_phys_addr
>> PAGE_SHIFT
)
896 kvm_arch_flush_shadow(kvm
);
898 kvm_free_physmem_slot(&old
, &new);
904 kvm_free_physmem_slot(&new, &old
);
909 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
911 int kvm_set_memory_region(struct kvm
*kvm
,
912 struct kvm_userspace_memory_region
*mem
,
917 mutex_lock(&kvm
->slots_lock
);
918 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
919 mutex_unlock(&kvm
->slots_lock
);
922 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
924 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
926 kvm_userspace_memory_region
*mem
,
929 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
931 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
934 int kvm_get_dirty_log(struct kvm
*kvm
,
935 struct kvm_dirty_log
*log
, int *is_dirty
)
937 struct kvm_memory_slot
*memslot
;
940 unsigned long any
= 0;
943 if (log
->slot
>= KVM_MEMORY_SLOTS
)
946 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
948 if (!memslot
->dirty_bitmap
)
951 n
= kvm_dirty_bitmap_bytes(memslot
);
953 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
954 any
= memslot
->dirty_bitmap
[i
];
957 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
968 void kvm_disable_largepages(void)
970 largepages_enabled
= false;
972 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
974 int is_error_page(struct page
*page
)
976 return page
== bad_page
|| page
== hwpoison_page
|| page
== fault_page
;
978 EXPORT_SYMBOL_GPL(is_error_page
);
980 int is_error_pfn(pfn_t pfn
)
982 return pfn
== bad_pfn
|| pfn
== hwpoison_pfn
|| pfn
== fault_pfn
;
984 EXPORT_SYMBOL_GPL(is_error_pfn
);
986 int is_hwpoison_pfn(pfn_t pfn
)
988 return pfn
== hwpoison_pfn
;
990 EXPORT_SYMBOL_GPL(is_hwpoison_pfn
);
992 int is_fault_pfn(pfn_t pfn
)
994 return pfn
== fault_pfn
;
996 EXPORT_SYMBOL_GPL(is_fault_pfn
);
998 int is_noslot_pfn(pfn_t pfn
)
1000 return pfn
== bad_pfn
;
1002 EXPORT_SYMBOL_GPL(is_noslot_pfn
);
1004 int is_invalid_pfn(pfn_t pfn
)
1006 return pfn
== hwpoison_pfn
|| pfn
== fault_pfn
;
1008 EXPORT_SYMBOL_GPL(is_invalid_pfn
);
1010 static inline unsigned long bad_hva(void)
1015 int kvm_is_error_hva(unsigned long addr
)
1017 return addr
== bad_hva();
1019 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
1021 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1023 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1025 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1027 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1029 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1031 if (!memslot
|| memslot
->id
>= KVM_MEMORY_SLOTS
||
1032 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1037 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1039 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1041 struct vm_area_struct
*vma
;
1042 unsigned long addr
, size
;
1046 addr
= gfn_to_hva(kvm
, gfn
);
1047 if (kvm_is_error_hva(addr
))
1050 down_read(¤t
->mm
->mmap_sem
);
1051 vma
= find_vma(current
->mm
, addr
);
1055 size
= vma_kernel_pagesize(vma
);
1058 up_read(¤t
->mm
->mmap_sem
);
1063 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1066 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1070 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1072 return gfn_to_hva_memslot(slot
, gfn
);
1075 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1077 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1079 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1081 static pfn_t
get_fault_pfn(void)
1083 get_page(fault_page
);
1087 int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1088 unsigned long start
, int write
, struct page
**page
)
1090 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1093 flags
|= FOLL_WRITE
;
1095 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1098 static inline int check_user_page_hwpoison(unsigned long addr
)
1100 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1102 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1103 flags
, NULL
, NULL
, NULL
);
1104 return rc
== -EHWPOISON
;
1107 static pfn_t
hva_to_pfn(struct kvm
*kvm
, unsigned long addr
, bool atomic
,
1108 bool *async
, bool write_fault
, bool *writable
)
1110 struct page
*page
[1];
1114 /* we can do it either atomically or asynchronously, not both */
1115 BUG_ON(atomic
&& async
);
1117 BUG_ON(!write_fault
&& !writable
);
1122 if (atomic
|| async
)
1123 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1125 if (unlikely(npages
!= 1) && !atomic
) {
1129 *writable
= write_fault
;
1132 down_read(¤t
->mm
->mmap_sem
);
1133 npages
= get_user_page_nowait(current
, current
->mm
,
1134 addr
, write_fault
, page
);
1135 up_read(¤t
->mm
->mmap_sem
);
1137 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1140 /* map read fault as writable if possible */
1141 if (unlikely(!write_fault
) && npages
== 1) {
1142 struct page
*wpage
[1];
1144 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1154 if (unlikely(npages
!= 1)) {
1155 struct vm_area_struct
*vma
;
1158 return get_fault_pfn();
1160 down_read(¤t
->mm
->mmap_sem
);
1161 if (npages
== -EHWPOISON
||
1162 (!async
&& check_user_page_hwpoison(addr
))) {
1163 up_read(¤t
->mm
->mmap_sem
);
1164 get_page(hwpoison_page
);
1165 return page_to_pfn(hwpoison_page
);
1168 vma
= find_vma_intersection(current
->mm
, addr
, addr
+1);
1171 pfn
= get_fault_pfn();
1172 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1173 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1175 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1177 if (async
&& (vma
->vm_flags
& VM_WRITE
))
1179 pfn
= get_fault_pfn();
1181 up_read(¤t
->mm
->mmap_sem
);
1183 pfn
= page_to_pfn(page
[0]);
1188 pfn_t
hva_to_pfn_atomic(struct kvm
*kvm
, unsigned long addr
)
1190 return hva_to_pfn(kvm
, addr
, true, NULL
, true, NULL
);
1192 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic
);
1194 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1195 bool write_fault
, bool *writable
)
1202 addr
= gfn_to_hva(kvm
, gfn
);
1203 if (kvm_is_error_hva(addr
)) {
1205 return page_to_pfn(bad_page
);
1208 return hva_to_pfn(kvm
, addr
, atomic
, async
, write_fault
, writable
);
1211 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1213 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1215 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1217 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1218 bool write_fault
, bool *writable
)
1220 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1222 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1224 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1226 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1228 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1230 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1233 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1235 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1237 pfn_t
gfn_to_pfn_memslot(struct kvm
*kvm
,
1238 struct kvm_memory_slot
*slot
, gfn_t gfn
)
1240 unsigned long addr
= gfn_to_hva_memslot(slot
, gfn
);
1241 return hva_to_pfn(kvm
, addr
, false, NULL
, true, NULL
);
1244 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1250 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1251 if (kvm_is_error_hva(addr
))
1254 if (entry
< nr_pages
)
1257 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1259 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1261 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1265 pfn
= gfn_to_pfn(kvm
, gfn
);
1266 if (!kvm_is_mmio_pfn(pfn
))
1267 return pfn_to_page(pfn
);
1269 WARN_ON(kvm_is_mmio_pfn(pfn
));
1275 EXPORT_SYMBOL_GPL(gfn_to_page
);
1277 void kvm_release_page_clean(struct page
*page
)
1279 kvm_release_pfn_clean(page_to_pfn(page
));
1281 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1283 void kvm_release_pfn_clean(pfn_t pfn
)
1285 if (!kvm_is_mmio_pfn(pfn
))
1286 put_page(pfn_to_page(pfn
));
1288 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1290 void kvm_release_page_dirty(struct page
*page
)
1292 kvm_release_pfn_dirty(page_to_pfn(page
));
1294 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1296 void kvm_release_pfn_dirty(pfn_t pfn
)
1298 kvm_set_pfn_dirty(pfn
);
1299 kvm_release_pfn_clean(pfn
);
1301 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1303 void kvm_set_page_dirty(struct page
*page
)
1305 kvm_set_pfn_dirty(page_to_pfn(page
));
1307 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1309 void kvm_set_pfn_dirty(pfn_t pfn
)
1311 if (!kvm_is_mmio_pfn(pfn
)) {
1312 struct page
*page
= pfn_to_page(pfn
);
1313 if (!PageReserved(page
))
1317 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1319 void kvm_set_pfn_accessed(pfn_t pfn
)
1321 if (!kvm_is_mmio_pfn(pfn
))
1322 mark_page_accessed(pfn_to_page(pfn
));
1324 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1326 void kvm_get_pfn(pfn_t pfn
)
1328 if (!kvm_is_mmio_pfn(pfn
))
1329 get_page(pfn_to_page(pfn
));
1331 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1333 static int next_segment(unsigned long len
, int offset
)
1335 if (len
> PAGE_SIZE
- offset
)
1336 return PAGE_SIZE
- offset
;
1341 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1347 addr
= gfn_to_hva(kvm
, gfn
);
1348 if (kvm_is_error_hva(addr
))
1350 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1355 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1357 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1359 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1361 int offset
= offset_in_page(gpa
);
1364 while ((seg
= next_segment(len
, offset
)) != 0) {
1365 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1375 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1377 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1382 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1383 int offset
= offset_in_page(gpa
);
1385 addr
= gfn_to_hva(kvm
, gfn
);
1386 if (kvm_is_error_hva(addr
))
1388 pagefault_disable();
1389 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1395 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1397 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1398 int offset
, int len
)
1403 addr
= gfn_to_hva(kvm
, gfn
);
1404 if (kvm_is_error_hva(addr
))
1406 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1409 mark_page_dirty(kvm
, gfn
);
1412 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1414 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1417 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1419 int offset
= offset_in_page(gpa
);
1422 while ((seg
= next_segment(len
, offset
)) != 0) {
1423 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1434 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1437 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1438 int offset
= offset_in_page(gpa
);
1439 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1442 ghc
->generation
= slots
->generation
;
1443 ghc
->memslot
= gfn_to_memslot(kvm
, gfn
);
1444 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, gfn
, NULL
);
1445 if (!kvm_is_error_hva(ghc
->hva
))
1452 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1454 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1455 void *data
, unsigned long len
)
1457 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1460 if (slots
->generation
!= ghc
->generation
)
1461 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1463 if (kvm_is_error_hva(ghc
->hva
))
1466 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1469 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1473 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1475 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1476 void *data
, unsigned long len
)
1478 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1481 if (slots
->generation
!= ghc
->generation
)
1482 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1484 if (kvm_is_error_hva(ghc
->hva
))
1487 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1493 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1495 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1497 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1500 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1502 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1504 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1506 int offset
= offset_in_page(gpa
);
1509 while ((seg
= next_segment(len
, offset
)) != 0) {
1510 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1519 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1521 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1524 if (memslot
&& memslot
->dirty_bitmap
) {
1525 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1527 if (!test_and_set_bit_le(rel_gfn
, memslot
->dirty_bitmap
))
1528 memslot
->nr_dirty_pages
++;
1532 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1534 struct kvm_memory_slot
*memslot
;
1536 memslot
= gfn_to_memslot(kvm
, gfn
);
1537 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1541 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1543 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1548 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1550 if (kvm_arch_vcpu_runnable(vcpu
)) {
1551 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1554 if (kvm_cpu_has_pending_timer(vcpu
))
1556 if (signal_pending(current
))
1562 finish_wait(&vcpu
->wq
, &wait
);
1565 void kvm_resched(struct kvm_vcpu
*vcpu
)
1567 if (!need_resched())
1571 EXPORT_SYMBOL_GPL(kvm_resched
);
1573 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1575 struct kvm
*kvm
= me
->kvm
;
1576 struct kvm_vcpu
*vcpu
;
1577 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1583 * We boost the priority of a VCPU that is runnable but not
1584 * currently running, because it got preempted by something
1585 * else and called schedule in __vcpu_run. Hopefully that
1586 * VCPU is holding the lock that we need and will release it.
1587 * We approximate round-robin by starting at the last boosted VCPU.
1589 for (pass
= 0; pass
< 2 && !yielded
; pass
++) {
1590 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1591 struct task_struct
*task
= NULL
;
1593 if (!pass
&& i
< last_boosted_vcpu
) {
1594 i
= last_boosted_vcpu
;
1596 } else if (pass
&& i
> last_boosted_vcpu
)
1600 if (waitqueue_active(&vcpu
->wq
))
1603 pid
= rcu_dereference(vcpu
->pid
);
1605 task
= get_pid_task(vcpu
->pid
, PIDTYPE_PID
);
1609 if (task
->flags
& PF_VCPU
) {
1610 put_task_struct(task
);
1613 if (yield_to(task
, 1)) {
1614 put_task_struct(task
);
1615 kvm
->last_boosted_vcpu
= i
;
1619 put_task_struct(task
);
1623 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1625 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1627 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1630 if (vmf
->pgoff
== 0)
1631 page
= virt_to_page(vcpu
->run
);
1633 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1634 page
= virt_to_page(vcpu
->arch
.pio_data
);
1636 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1637 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1638 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1641 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1647 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1648 .fault
= kvm_vcpu_fault
,
1651 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1653 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1657 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1659 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1661 kvm_put_kvm(vcpu
->kvm
);
1665 static struct file_operations kvm_vcpu_fops
= {
1666 .release
= kvm_vcpu_release
,
1667 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1668 #ifdef CONFIG_COMPAT
1669 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1671 .mmap
= kvm_vcpu_mmap
,
1672 .llseek
= noop_llseek
,
1676 * Allocates an inode for the vcpu.
1678 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1680 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1684 * Creates some virtual cpus. Good luck creating more than one.
1686 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1689 struct kvm_vcpu
*vcpu
, *v
;
1691 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1693 return PTR_ERR(vcpu
);
1695 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1697 r
= kvm_arch_vcpu_setup(vcpu
);
1701 mutex_lock(&kvm
->lock
);
1702 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1704 goto unlock_vcpu_destroy
;
1707 kvm_for_each_vcpu(r
, v
, kvm
)
1708 if (v
->vcpu_id
== id
) {
1710 goto unlock_vcpu_destroy
;
1713 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1715 /* Now it's all set up, let userspace reach it */
1717 r
= create_vcpu_fd(vcpu
);
1720 goto unlock_vcpu_destroy
;
1723 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1725 atomic_inc(&kvm
->online_vcpus
);
1727 mutex_unlock(&kvm
->lock
);
1730 unlock_vcpu_destroy
:
1731 mutex_unlock(&kvm
->lock
);
1733 kvm_arch_vcpu_destroy(vcpu
);
1737 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1740 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1741 vcpu
->sigset_active
= 1;
1742 vcpu
->sigset
= *sigset
;
1744 vcpu
->sigset_active
= 0;
1748 static long kvm_vcpu_ioctl(struct file
*filp
,
1749 unsigned int ioctl
, unsigned long arg
)
1751 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1752 void __user
*argp
= (void __user
*)arg
;
1754 struct kvm_fpu
*fpu
= NULL
;
1755 struct kvm_sregs
*kvm_sregs
= NULL
;
1757 if (vcpu
->kvm
->mm
!= current
->mm
)
1760 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1762 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1763 * so vcpu_load() would break it.
1765 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1766 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1776 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1777 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1779 case KVM_GET_REGS
: {
1780 struct kvm_regs
*kvm_regs
;
1783 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1786 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1790 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1797 case KVM_SET_REGS
: {
1798 struct kvm_regs
*kvm_regs
;
1801 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
1802 if (IS_ERR(kvm_regs
)) {
1803 r
= PTR_ERR(kvm_regs
);
1806 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1814 case KVM_GET_SREGS
: {
1815 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1819 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1823 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1828 case KVM_SET_SREGS
: {
1829 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
1830 if (IS_ERR(kvm_sregs
)) {
1831 r
= PTR_ERR(kvm_sregs
);
1834 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1840 case KVM_GET_MP_STATE
: {
1841 struct kvm_mp_state mp_state
;
1843 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1847 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1852 case KVM_SET_MP_STATE
: {
1853 struct kvm_mp_state mp_state
;
1856 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1858 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1864 case KVM_TRANSLATE
: {
1865 struct kvm_translation tr
;
1868 if (copy_from_user(&tr
, argp
, sizeof tr
))
1870 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1874 if (copy_to_user(argp
, &tr
, sizeof tr
))
1879 case KVM_SET_GUEST_DEBUG
: {
1880 struct kvm_guest_debug dbg
;
1883 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1885 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1891 case KVM_SET_SIGNAL_MASK
: {
1892 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1893 struct kvm_signal_mask kvm_sigmask
;
1894 sigset_t sigset
, *p
;
1899 if (copy_from_user(&kvm_sigmask
, argp
,
1900 sizeof kvm_sigmask
))
1903 if (kvm_sigmask
.len
!= sizeof sigset
)
1906 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1911 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
1915 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1919 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1923 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1929 fpu
= memdup_user(argp
, sizeof(*fpu
));
1934 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1941 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1950 #ifdef CONFIG_COMPAT
1951 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
1952 unsigned int ioctl
, unsigned long arg
)
1954 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1955 void __user
*argp
= compat_ptr(arg
);
1958 if (vcpu
->kvm
->mm
!= current
->mm
)
1962 case KVM_SET_SIGNAL_MASK
: {
1963 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1964 struct kvm_signal_mask kvm_sigmask
;
1965 compat_sigset_t csigset
;
1970 if (copy_from_user(&kvm_sigmask
, argp
,
1971 sizeof kvm_sigmask
))
1974 if (kvm_sigmask
.len
!= sizeof csigset
)
1977 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
1981 sigset_from_compat(&sigset
, &csigset
);
1982 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1986 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
1994 static long kvm_vm_ioctl(struct file
*filp
,
1995 unsigned int ioctl
, unsigned long arg
)
1997 struct kvm
*kvm
= filp
->private_data
;
1998 void __user
*argp
= (void __user
*)arg
;
2001 if (kvm
->mm
!= current
->mm
)
2004 case KVM_CREATE_VCPU
:
2005 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2009 case KVM_SET_USER_MEMORY_REGION
: {
2010 struct kvm_userspace_memory_region kvm_userspace_mem
;
2013 if (copy_from_user(&kvm_userspace_mem
, argp
,
2014 sizeof kvm_userspace_mem
))
2017 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
2022 case KVM_GET_DIRTY_LOG
: {
2023 struct kvm_dirty_log log
;
2026 if (copy_from_user(&log
, argp
, sizeof log
))
2028 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2033 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2034 case KVM_REGISTER_COALESCED_MMIO
: {
2035 struct kvm_coalesced_mmio_zone zone
;
2037 if (copy_from_user(&zone
, argp
, sizeof zone
))
2039 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2045 case KVM_UNREGISTER_COALESCED_MMIO
: {
2046 struct kvm_coalesced_mmio_zone zone
;
2048 if (copy_from_user(&zone
, argp
, sizeof zone
))
2050 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2058 struct kvm_irqfd data
;
2061 if (copy_from_user(&data
, argp
, sizeof data
))
2063 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
2066 case KVM_IOEVENTFD
: {
2067 struct kvm_ioeventfd data
;
2070 if (copy_from_user(&data
, argp
, sizeof data
))
2072 r
= kvm_ioeventfd(kvm
, &data
);
2075 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2076 case KVM_SET_BOOT_CPU_ID
:
2078 mutex_lock(&kvm
->lock
);
2079 if (atomic_read(&kvm
->online_vcpus
) != 0)
2082 kvm
->bsp_vcpu_id
= arg
;
2083 mutex_unlock(&kvm
->lock
);
2087 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2089 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2095 #ifdef CONFIG_COMPAT
2096 struct compat_kvm_dirty_log
{
2100 compat_uptr_t dirty_bitmap
; /* one bit per page */
2105 static long kvm_vm_compat_ioctl(struct file
*filp
,
2106 unsigned int ioctl
, unsigned long arg
)
2108 struct kvm
*kvm
= filp
->private_data
;
2111 if (kvm
->mm
!= current
->mm
)
2114 case KVM_GET_DIRTY_LOG
: {
2115 struct compat_kvm_dirty_log compat_log
;
2116 struct kvm_dirty_log log
;
2119 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2120 sizeof(compat_log
)))
2122 log
.slot
= compat_log
.slot
;
2123 log
.padding1
= compat_log
.padding1
;
2124 log
.padding2
= compat_log
.padding2
;
2125 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2127 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2133 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2141 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2143 struct page
*page
[1];
2146 gfn_t gfn
= vmf
->pgoff
;
2147 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2149 addr
= gfn_to_hva(kvm
, gfn
);
2150 if (kvm_is_error_hva(addr
))
2151 return VM_FAULT_SIGBUS
;
2153 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2155 if (unlikely(npages
!= 1))
2156 return VM_FAULT_SIGBUS
;
2158 vmf
->page
= page
[0];
2162 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2163 .fault
= kvm_vm_fault
,
2166 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2168 vma
->vm_ops
= &kvm_vm_vm_ops
;
2172 static struct file_operations kvm_vm_fops
= {
2173 .release
= kvm_vm_release
,
2174 .unlocked_ioctl
= kvm_vm_ioctl
,
2175 #ifdef CONFIG_COMPAT
2176 .compat_ioctl
= kvm_vm_compat_ioctl
,
2178 .mmap
= kvm_vm_mmap
,
2179 .llseek
= noop_llseek
,
2182 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2187 kvm
= kvm_create_vm(type
);
2189 return PTR_ERR(kvm
);
2190 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2191 r
= kvm_coalesced_mmio_init(kvm
);
2197 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2204 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2207 case KVM_CAP_USER_MEMORY
:
2208 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2209 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2210 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2211 case KVM_CAP_SET_BOOT_CPU_ID
:
2213 case KVM_CAP_INTERNAL_ERROR_DATA
:
2215 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2216 case KVM_CAP_IRQ_ROUTING
:
2217 return KVM_MAX_IRQ_ROUTES
;
2222 return kvm_dev_ioctl_check_extension(arg
);
2225 static long kvm_dev_ioctl(struct file
*filp
,
2226 unsigned int ioctl
, unsigned long arg
)
2231 case KVM_GET_API_VERSION
:
2235 r
= KVM_API_VERSION
;
2238 r
= kvm_dev_ioctl_create_vm(arg
);
2240 case KVM_CHECK_EXTENSION
:
2241 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2243 case KVM_GET_VCPU_MMAP_SIZE
:
2247 r
= PAGE_SIZE
; /* struct kvm_run */
2249 r
+= PAGE_SIZE
; /* pio data page */
2251 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2252 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2255 case KVM_TRACE_ENABLE
:
2256 case KVM_TRACE_PAUSE
:
2257 case KVM_TRACE_DISABLE
:
2261 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2267 static struct file_operations kvm_chardev_ops
= {
2268 .unlocked_ioctl
= kvm_dev_ioctl
,
2269 .compat_ioctl
= kvm_dev_ioctl
,
2270 .llseek
= noop_llseek
,
2273 static struct miscdevice kvm_dev
= {
2279 static void hardware_enable_nolock(void *junk
)
2281 int cpu
= raw_smp_processor_id();
2284 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2287 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2289 r
= kvm_arch_hardware_enable(NULL
);
2292 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2293 atomic_inc(&hardware_enable_failed
);
2294 printk(KERN_INFO
"kvm: enabling virtualization on "
2295 "CPU%d failed\n", cpu
);
2299 static void hardware_enable(void *junk
)
2301 raw_spin_lock(&kvm_lock
);
2302 hardware_enable_nolock(junk
);
2303 raw_spin_unlock(&kvm_lock
);
2306 static void hardware_disable_nolock(void *junk
)
2308 int cpu
= raw_smp_processor_id();
2310 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2312 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2313 kvm_arch_hardware_disable(NULL
);
2316 static void hardware_disable(void *junk
)
2318 raw_spin_lock(&kvm_lock
);
2319 hardware_disable_nolock(junk
);
2320 raw_spin_unlock(&kvm_lock
);
2323 static void hardware_disable_all_nolock(void)
2325 BUG_ON(!kvm_usage_count
);
2328 if (!kvm_usage_count
)
2329 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2332 static void hardware_disable_all(void)
2334 raw_spin_lock(&kvm_lock
);
2335 hardware_disable_all_nolock();
2336 raw_spin_unlock(&kvm_lock
);
2339 static int hardware_enable_all(void)
2343 raw_spin_lock(&kvm_lock
);
2346 if (kvm_usage_count
== 1) {
2347 atomic_set(&hardware_enable_failed
, 0);
2348 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2350 if (atomic_read(&hardware_enable_failed
)) {
2351 hardware_disable_all_nolock();
2356 raw_spin_unlock(&kvm_lock
);
2361 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2366 if (!kvm_usage_count
)
2369 val
&= ~CPU_TASKS_FROZEN
;
2372 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2374 hardware_disable(NULL
);
2377 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2379 hardware_enable(NULL
);
2386 asmlinkage
void kvm_spurious_fault(void)
2388 /* Fault while not rebooting. We want the trace. */
2391 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
2393 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2397 * Some (well, at least mine) BIOSes hang on reboot if
2400 * And Intel TXT required VMX off for all cpu when system shutdown.
2402 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2403 kvm_rebooting
= true;
2404 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2408 static struct notifier_block kvm_reboot_notifier
= {
2409 .notifier_call
= kvm_reboot
,
2413 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2417 for (i
= 0; i
< bus
->dev_count
; i
++) {
2418 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2420 kvm_iodevice_destructor(pos
);
2425 int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2427 const struct kvm_io_range
*r1
= p1
;
2428 const struct kvm_io_range
*r2
= p2
;
2430 if (r1
->addr
< r2
->addr
)
2432 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2437 int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2438 gpa_t addr
, int len
)
2440 if (bus
->dev_count
== NR_IOBUS_DEVS
)
2443 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2449 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2450 kvm_io_bus_sort_cmp
, NULL
);
2455 int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2456 gpa_t addr
, int len
)
2458 struct kvm_io_range
*range
, key
;
2461 key
= (struct kvm_io_range
) {
2466 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2467 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2471 off
= range
- bus
->range
;
2473 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2479 /* kvm_io_bus_write - called under kvm->slots_lock */
2480 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2481 int len
, const void *val
)
2484 struct kvm_io_bus
*bus
;
2485 struct kvm_io_range range
;
2487 range
= (struct kvm_io_range
) {
2492 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2493 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2497 while (idx
< bus
->dev_count
&&
2498 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2499 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2507 /* kvm_io_bus_read - called under kvm->slots_lock */
2508 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2512 struct kvm_io_bus
*bus
;
2513 struct kvm_io_range range
;
2515 range
= (struct kvm_io_range
) {
2520 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2521 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2525 while (idx
< bus
->dev_count
&&
2526 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2527 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2535 /* Caller must hold slots_lock. */
2536 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2537 int len
, struct kvm_io_device
*dev
)
2539 struct kvm_io_bus
*new_bus
, *bus
;
2541 bus
= kvm
->buses
[bus_idx
];
2542 if (bus
->dev_count
> NR_IOBUS_DEVS
-1)
2545 new_bus
= kmemdup(bus
, sizeof(struct kvm_io_bus
), GFP_KERNEL
);
2548 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2549 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2550 synchronize_srcu_expedited(&kvm
->srcu
);
2556 /* Caller must hold slots_lock. */
2557 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2558 struct kvm_io_device
*dev
)
2561 struct kvm_io_bus
*new_bus
, *bus
;
2563 bus
= kvm
->buses
[bus_idx
];
2565 new_bus
= kmemdup(bus
, sizeof(*bus
), GFP_KERNEL
);
2570 for (i
= 0; i
< new_bus
->dev_count
; i
++)
2571 if (new_bus
->range
[i
].dev
== dev
) {
2573 new_bus
->dev_count
--;
2574 new_bus
->range
[i
] = new_bus
->range
[new_bus
->dev_count
];
2575 sort(new_bus
->range
, new_bus
->dev_count
,
2576 sizeof(struct kvm_io_range
),
2577 kvm_io_bus_sort_cmp
, NULL
);
2586 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2587 synchronize_srcu_expedited(&kvm
->srcu
);
2592 static struct notifier_block kvm_cpu_notifier
= {
2593 .notifier_call
= kvm_cpu_hotplug
,
2596 static int vm_stat_get(void *_offset
, u64
*val
)
2598 unsigned offset
= (long)_offset
;
2602 raw_spin_lock(&kvm_lock
);
2603 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2604 *val
+= *(u32
*)((void *)kvm
+ offset
);
2605 raw_spin_unlock(&kvm_lock
);
2609 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2611 static int vcpu_stat_get(void *_offset
, u64
*val
)
2613 unsigned offset
= (long)_offset
;
2615 struct kvm_vcpu
*vcpu
;
2619 raw_spin_lock(&kvm_lock
);
2620 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2621 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2622 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2624 raw_spin_unlock(&kvm_lock
);
2628 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2630 static const struct file_operations
*stat_fops
[] = {
2631 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2632 [KVM_STAT_VM
] = &vm_stat_fops
,
2635 static int kvm_init_debug(void)
2638 struct kvm_stats_debugfs_item
*p
;
2640 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2641 if (kvm_debugfs_dir
== NULL
)
2644 for (p
= debugfs_entries
; p
->name
; ++p
) {
2645 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2646 (void *)(long)p
->offset
,
2647 stat_fops
[p
->kind
]);
2648 if (p
->dentry
== NULL
)
2655 debugfs_remove_recursive(kvm_debugfs_dir
);
2660 static void kvm_exit_debug(void)
2662 struct kvm_stats_debugfs_item
*p
;
2664 for (p
= debugfs_entries
; p
->name
; ++p
)
2665 debugfs_remove(p
->dentry
);
2666 debugfs_remove(kvm_debugfs_dir
);
2669 static int kvm_suspend(void)
2671 if (kvm_usage_count
)
2672 hardware_disable_nolock(NULL
);
2676 static void kvm_resume(void)
2678 if (kvm_usage_count
) {
2679 WARN_ON(raw_spin_is_locked(&kvm_lock
));
2680 hardware_enable_nolock(NULL
);
2684 static struct syscore_ops kvm_syscore_ops
= {
2685 .suspend
= kvm_suspend
,
2686 .resume
= kvm_resume
,
2689 struct page
*bad_page
;
2693 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2695 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2698 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2700 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2702 kvm_arch_vcpu_load(vcpu
, cpu
);
2705 static void kvm_sched_out(struct preempt_notifier
*pn
,
2706 struct task_struct
*next
)
2708 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2710 kvm_arch_vcpu_put(vcpu
);
2713 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2714 struct module
*module
)
2719 r
= kvm_arch_init(opaque
);
2723 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2725 if (bad_page
== NULL
) {
2730 bad_pfn
= page_to_pfn(bad_page
);
2732 hwpoison_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2734 if (hwpoison_page
== NULL
) {
2739 hwpoison_pfn
= page_to_pfn(hwpoison_page
);
2741 fault_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2743 if (fault_page
== NULL
) {
2748 fault_pfn
= page_to_pfn(fault_page
);
2750 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2755 r
= kvm_arch_hardware_setup();
2759 for_each_online_cpu(cpu
) {
2760 smp_call_function_single(cpu
,
2761 kvm_arch_check_processor_compat
,
2767 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2770 register_reboot_notifier(&kvm_reboot_notifier
);
2772 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2774 vcpu_align
= __alignof__(struct kvm_vcpu
);
2775 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2777 if (!kvm_vcpu_cache
) {
2782 r
= kvm_async_pf_init();
2786 kvm_chardev_ops
.owner
= module
;
2787 kvm_vm_fops
.owner
= module
;
2788 kvm_vcpu_fops
.owner
= module
;
2790 r
= misc_register(&kvm_dev
);
2792 printk(KERN_ERR
"kvm: misc device register failed\n");
2796 register_syscore_ops(&kvm_syscore_ops
);
2798 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2799 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2801 r
= kvm_init_debug();
2803 printk(KERN_ERR
"kvm: create debugfs files failed\n");
2810 unregister_syscore_ops(&kvm_syscore_ops
);
2812 kvm_async_pf_deinit();
2814 kmem_cache_destroy(kvm_vcpu_cache
);
2816 unregister_reboot_notifier(&kvm_reboot_notifier
);
2817 unregister_cpu_notifier(&kvm_cpu_notifier
);
2820 kvm_arch_hardware_unsetup();
2822 free_cpumask_var(cpus_hardware_enabled
);
2825 __free_page(fault_page
);
2827 __free_page(hwpoison_page
);
2828 __free_page(bad_page
);
2834 EXPORT_SYMBOL_GPL(kvm_init
);
2839 misc_deregister(&kvm_dev
);
2840 kmem_cache_destroy(kvm_vcpu_cache
);
2841 kvm_async_pf_deinit();
2842 unregister_syscore_ops(&kvm_syscore_ops
);
2843 unregister_reboot_notifier(&kvm_reboot_notifier
);
2844 unregister_cpu_notifier(&kvm_cpu_notifier
);
2845 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2846 kvm_arch_hardware_unsetup();
2848 free_cpumask_var(cpus_hardware_enabled
);
2849 __free_page(hwpoison_page
);
2850 __free_page(bad_page
);
2852 EXPORT_SYMBOL_GPL(kvm_exit
);