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 long 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
);
293 kvm
->mmu_notifier_seq
++;
294 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
295 /* we've to flush the tlb before the pages can be freed */
297 kvm_flush_remote_tlbs(kvm
);
299 spin_unlock(&kvm
->mmu_lock
);
300 srcu_read_unlock(&kvm
->srcu
, idx
);
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 /* we've to flush the tlb before the pages can be freed */
340 kvm_flush_remote_tlbs(kvm
);
342 spin_unlock(&kvm
->mmu_lock
);
343 srcu_read_unlock(&kvm
->srcu
, idx
);
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
);
382 young
= kvm_age_hva(kvm
, address
);
384 kvm_flush_remote_tlbs(kvm
);
386 spin_unlock(&kvm
->mmu_lock
);
387 srcu_read_unlock(&kvm
->srcu
, idx
);
392 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
393 struct mm_struct
*mm
,
394 unsigned long address
)
396 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
399 idx
= srcu_read_lock(&kvm
->srcu
);
400 spin_lock(&kvm
->mmu_lock
);
401 young
= kvm_test_age_hva(kvm
, address
);
402 spin_unlock(&kvm
->mmu_lock
);
403 srcu_read_unlock(&kvm
->srcu
, idx
);
408 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
409 struct mm_struct
*mm
)
411 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
414 idx
= srcu_read_lock(&kvm
->srcu
);
415 kvm_arch_flush_shadow(kvm
);
416 srcu_read_unlock(&kvm
->srcu
, idx
);
419 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
420 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
421 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
422 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
423 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
424 .test_young
= kvm_mmu_notifier_test_young
,
425 .change_pte
= kvm_mmu_notifier_change_pte
,
426 .release
= kvm_mmu_notifier_release
,
429 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
431 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
432 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
435 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
437 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
442 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
444 static void kvm_init_memslots_id(struct kvm
*kvm
)
447 struct kvm_memslots
*slots
= kvm
->memslots
;
449 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
450 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
453 static struct kvm
*kvm_create_vm(unsigned long type
)
456 struct kvm
*kvm
= kvm_arch_alloc_vm();
459 return ERR_PTR(-ENOMEM
);
461 r
= kvm_arch_init_vm(kvm
, type
);
463 goto out_err_nodisable
;
465 r
= hardware_enable_all();
467 goto out_err_nodisable
;
469 #ifdef CONFIG_HAVE_KVM_IRQCHIP
470 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
471 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
475 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
478 kvm_init_memslots_id(kvm
);
479 if (init_srcu_struct(&kvm
->srcu
))
481 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
482 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
488 spin_lock_init(&kvm
->mmu_lock
);
489 kvm
->mm
= current
->mm
;
490 atomic_inc(&kvm
->mm
->mm_count
);
491 kvm_eventfd_init(kvm
);
492 mutex_init(&kvm
->lock
);
493 mutex_init(&kvm
->irq_lock
);
494 mutex_init(&kvm
->slots_lock
);
495 atomic_set(&kvm
->users_count
, 1);
497 r
= kvm_init_mmu_notifier(kvm
);
501 raw_spin_lock(&kvm_lock
);
502 list_add(&kvm
->vm_list
, &vm_list
);
503 raw_spin_unlock(&kvm_lock
);
508 cleanup_srcu_struct(&kvm
->srcu
);
510 hardware_disable_all();
512 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
513 kfree(kvm
->buses
[i
]);
514 kfree(kvm
->memslots
);
515 kvm_arch_free_vm(kvm
);
519 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
521 if (!memslot
->dirty_bitmap
)
524 if (2 * kvm_dirty_bitmap_bytes(memslot
) > PAGE_SIZE
)
525 vfree(memslot
->dirty_bitmap
);
527 kfree(memslot
->dirty_bitmap
);
529 memslot
->dirty_bitmap
= 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
)
538 if (!dont
|| free
->rmap
!= dont
->rmap
)
541 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
542 kvm_destroy_dirty_bitmap(free
);
544 kvm_arch_free_memslot(free
, dont
);
550 void kvm_free_physmem(struct kvm
*kvm
)
552 struct kvm_memslots
*slots
= kvm
->memslots
;
553 struct kvm_memory_slot
*memslot
;
555 kvm_for_each_memslot(memslot
, slots
)
556 kvm_free_physmem_slot(memslot
, NULL
);
558 kfree(kvm
->memslots
);
561 static void kvm_destroy_vm(struct kvm
*kvm
)
564 struct mm_struct
*mm
= kvm
->mm
;
566 kvm_arch_sync_events(kvm
);
567 raw_spin_lock(&kvm_lock
);
568 list_del(&kvm
->vm_list
);
569 raw_spin_unlock(&kvm_lock
);
570 kvm_free_irq_routing(kvm
);
571 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
572 kvm_io_bus_destroy(kvm
->buses
[i
]);
573 kvm_coalesced_mmio_free(kvm
);
574 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
575 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
577 kvm_arch_flush_shadow(kvm
);
579 kvm_arch_destroy_vm(kvm
);
580 kvm_free_physmem(kvm
);
581 cleanup_srcu_struct(&kvm
->srcu
);
582 kvm_arch_free_vm(kvm
);
583 hardware_disable_all();
587 void kvm_get_kvm(struct kvm
*kvm
)
589 atomic_inc(&kvm
->users_count
);
591 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
593 void kvm_put_kvm(struct kvm
*kvm
)
595 if (atomic_dec_and_test(&kvm
->users_count
))
598 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
601 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
603 struct kvm
*kvm
= filp
->private_data
;
605 kvm_irqfd_release(kvm
);
612 * Allocation size is twice as large as the actual dirty bitmap size.
613 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
615 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
618 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
620 if (dirty_bytes
> PAGE_SIZE
)
621 memslot
->dirty_bitmap
= vzalloc(dirty_bytes
);
623 memslot
->dirty_bitmap
= kzalloc(dirty_bytes
, GFP_KERNEL
);
625 if (!memslot
->dirty_bitmap
)
628 #endif /* !CONFIG_S390 */
632 static int cmp_memslot(const void *slot1
, const void *slot2
)
634 struct kvm_memory_slot
*s1
, *s2
;
636 s1
= (struct kvm_memory_slot
*)slot1
;
637 s2
= (struct kvm_memory_slot
*)slot2
;
639 if (s1
->npages
< s2
->npages
)
641 if (s1
->npages
> s2
->npages
)
648 * Sort the memslots base on its size, so the larger slots
649 * will get better fit.
651 static void sort_memslots(struct kvm_memslots
*slots
)
655 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
656 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
658 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
659 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
662 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
666 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
667 unsigned long npages
= old
->npages
;
670 if (new->npages
!= npages
)
671 sort_memslots(slots
);
678 * Allocate some memory and give it an address in the guest physical address
681 * Discontiguous memory is allowed, mostly for framebuffers.
683 * Must be called holding mmap_sem for write.
685 int __kvm_set_memory_region(struct kvm
*kvm
,
686 struct kvm_userspace_memory_region
*mem
,
691 unsigned long npages
;
693 struct kvm_memory_slot
*memslot
;
694 struct kvm_memory_slot old
, new;
695 struct kvm_memslots
*slots
, *old_memslots
;
698 /* General sanity checks */
699 if (mem
->memory_size
& (PAGE_SIZE
- 1))
701 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
703 /* We can read the guest memory with __xxx_user() later on. */
705 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
706 !access_ok(VERIFY_WRITE
,
707 (void __user
*)(unsigned long)mem
->userspace_addr
,
710 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
712 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
715 memslot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
716 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
717 npages
= mem
->memory_size
>> PAGE_SHIFT
;
720 if (npages
> KVM_MEM_MAX_NR_PAGES
)
724 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
726 new = old
= *memslot
;
729 new.base_gfn
= base_gfn
;
731 new.flags
= mem
->flags
;
733 /* Disallow changing a memory slot's size. */
735 if (npages
&& old
.npages
&& npages
!= old
.npages
)
738 /* Check for overlaps */
740 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
741 struct kvm_memory_slot
*s
= &kvm
->memslots
->memslots
[i
];
743 if (s
== memslot
|| !s
->npages
)
745 if (!((base_gfn
+ npages
<= s
->base_gfn
) ||
746 (base_gfn
>= s
->base_gfn
+ s
->npages
)))
750 /* Free page dirty bitmap if unneeded */
751 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
752 new.dirty_bitmap
= NULL
;
756 /* Allocate if a slot is being created */
757 if (npages
&& !old
.npages
) {
758 new.user_alloc
= user_alloc
;
759 new.userspace_addr
= mem
->userspace_addr
;
761 new.rmap
= vzalloc(npages
* sizeof(*new.rmap
));
764 #endif /* not defined CONFIG_S390 */
765 if (kvm_arch_create_memslot(&new, npages
))
769 /* Allocate page dirty bitmap if needed */
770 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
771 if (kvm_create_dirty_bitmap(&new) < 0)
773 /* destroy any largepage mappings for dirty tracking */
777 struct kvm_memory_slot
*slot
;
780 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
784 slot
= id_to_memslot(slots
, mem
->slot
);
785 slot
->flags
|= KVM_MEMSLOT_INVALID
;
787 update_memslots(slots
, NULL
);
789 old_memslots
= kvm
->memslots
;
790 rcu_assign_pointer(kvm
->memslots
, slots
);
791 synchronize_srcu_expedited(&kvm
->srcu
);
792 /* From this point no new shadow pages pointing to a deleted
793 * memslot will be created.
795 * validation of sp->gfn happens in:
796 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
797 * - kvm_is_visible_gfn (mmu_check_roots)
799 kvm_arch_flush_shadow(kvm
);
803 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
807 /* map/unmap the pages in iommu page table */
809 r
= kvm_iommu_map_pages(kvm
, &new);
813 kvm_iommu_unmap_pages(kvm
, &old
);
816 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
821 /* actual memory is freed via old in kvm_free_physmem_slot below */
824 new.dirty_bitmap
= NULL
;
825 memset(&new.arch
, 0, sizeof(new.arch
));
828 update_memslots(slots
, &new);
829 old_memslots
= kvm
->memslots
;
830 rcu_assign_pointer(kvm
->memslots
, slots
);
831 synchronize_srcu_expedited(&kvm
->srcu
);
833 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
836 * If the new memory slot is created, we need to clear all
839 if (npages
&& old
.base_gfn
!= mem
->guest_phys_addr
>> PAGE_SHIFT
)
840 kvm_arch_flush_shadow(kvm
);
842 kvm_free_physmem_slot(&old
, &new);
848 kvm_free_physmem_slot(&new, &old
);
853 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
855 int kvm_set_memory_region(struct kvm
*kvm
,
856 struct kvm_userspace_memory_region
*mem
,
861 mutex_lock(&kvm
->slots_lock
);
862 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
863 mutex_unlock(&kvm
->slots_lock
);
866 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
868 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
870 kvm_userspace_memory_region
*mem
,
873 if (mem
->slot
>= KVM_MEMORY_SLOTS
)
875 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
878 int kvm_get_dirty_log(struct kvm
*kvm
,
879 struct kvm_dirty_log
*log
, int *is_dirty
)
881 struct kvm_memory_slot
*memslot
;
884 unsigned long any
= 0;
887 if (log
->slot
>= KVM_MEMORY_SLOTS
)
890 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
892 if (!memslot
->dirty_bitmap
)
895 n
= kvm_dirty_bitmap_bytes(memslot
);
897 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
898 any
= memslot
->dirty_bitmap
[i
];
901 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
912 bool kvm_largepages_enabled(void)
914 return largepages_enabled
;
917 void kvm_disable_largepages(void)
919 largepages_enabled
= false;
921 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
923 int is_error_page(struct page
*page
)
925 return page
== bad_page
|| page
== hwpoison_page
|| page
== fault_page
;
927 EXPORT_SYMBOL_GPL(is_error_page
);
929 int is_error_pfn(pfn_t pfn
)
931 return pfn
== bad_pfn
|| pfn
== hwpoison_pfn
|| pfn
== fault_pfn
;
933 EXPORT_SYMBOL_GPL(is_error_pfn
);
935 int is_hwpoison_pfn(pfn_t pfn
)
937 return pfn
== hwpoison_pfn
;
939 EXPORT_SYMBOL_GPL(is_hwpoison_pfn
);
941 int is_fault_pfn(pfn_t pfn
)
943 return pfn
== fault_pfn
;
945 EXPORT_SYMBOL_GPL(is_fault_pfn
);
947 int is_noslot_pfn(pfn_t pfn
)
949 return pfn
== bad_pfn
;
951 EXPORT_SYMBOL_GPL(is_noslot_pfn
);
953 int is_invalid_pfn(pfn_t pfn
)
955 return pfn
== hwpoison_pfn
|| pfn
== fault_pfn
;
957 EXPORT_SYMBOL_GPL(is_invalid_pfn
);
959 static inline unsigned long bad_hva(void)
964 int kvm_is_error_hva(unsigned long addr
)
966 return addr
== bad_hva();
968 EXPORT_SYMBOL_GPL(kvm_is_error_hva
);
970 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
972 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
974 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
976 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
978 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
980 if (!memslot
|| memslot
->id
>= KVM_MEMORY_SLOTS
||
981 memslot
->flags
& KVM_MEMSLOT_INVALID
)
986 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
988 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
990 struct vm_area_struct
*vma
;
991 unsigned long addr
, size
;
995 addr
= gfn_to_hva(kvm
, gfn
);
996 if (kvm_is_error_hva(addr
))
999 down_read(¤t
->mm
->mmap_sem
);
1000 vma
= find_vma(current
->mm
, addr
);
1004 size
= vma_kernel_pagesize(vma
);
1007 up_read(¤t
->mm
->mmap_sem
);
1012 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1015 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1019 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1021 return gfn_to_hva_memslot(slot
, gfn
);
1024 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1026 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1028 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1030 static pfn_t
get_fault_pfn(void)
1032 get_page(fault_page
);
1036 int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1037 unsigned long start
, int write
, struct page
**page
)
1039 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1042 flags
|= FOLL_WRITE
;
1044 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1047 static inline int check_user_page_hwpoison(unsigned long addr
)
1049 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1051 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1052 flags
, NULL
, NULL
, NULL
);
1053 return rc
== -EHWPOISON
;
1056 static pfn_t
hva_to_pfn(struct kvm
*kvm
, unsigned long addr
, bool atomic
,
1057 bool *async
, bool write_fault
, bool *writable
)
1059 struct page
*page
[1];
1063 /* we can do it either atomically or asynchronously, not both */
1064 BUG_ON(atomic
&& async
);
1066 BUG_ON(!write_fault
&& !writable
);
1071 if (atomic
|| async
)
1072 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1074 if (unlikely(npages
!= 1) && !atomic
) {
1078 *writable
= write_fault
;
1081 down_read(¤t
->mm
->mmap_sem
);
1082 npages
= get_user_page_nowait(current
, current
->mm
,
1083 addr
, write_fault
, page
);
1084 up_read(¤t
->mm
->mmap_sem
);
1086 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1089 /* map read fault as writable if possible */
1090 if (unlikely(!write_fault
) && npages
== 1) {
1091 struct page
*wpage
[1];
1093 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1103 if (unlikely(npages
!= 1)) {
1104 struct vm_area_struct
*vma
;
1107 return get_fault_pfn();
1109 down_read(¤t
->mm
->mmap_sem
);
1110 if (npages
== -EHWPOISON
||
1111 (!async
&& check_user_page_hwpoison(addr
))) {
1112 up_read(¤t
->mm
->mmap_sem
);
1113 get_page(hwpoison_page
);
1114 return page_to_pfn(hwpoison_page
);
1117 vma
= find_vma_intersection(current
->mm
, addr
, addr
+1);
1120 pfn
= get_fault_pfn();
1121 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1122 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1124 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1126 if (async
&& (vma
->vm_flags
& VM_WRITE
))
1128 pfn
= get_fault_pfn();
1130 up_read(¤t
->mm
->mmap_sem
);
1132 pfn
= page_to_pfn(page
[0]);
1137 pfn_t
hva_to_pfn_atomic(struct kvm
*kvm
, unsigned long addr
)
1139 return hva_to_pfn(kvm
, addr
, true, NULL
, true, NULL
);
1141 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic
);
1143 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1144 bool write_fault
, bool *writable
)
1151 addr
= gfn_to_hva(kvm
, gfn
);
1152 if (kvm_is_error_hva(addr
)) {
1154 return page_to_pfn(bad_page
);
1157 return hva_to_pfn(kvm
, addr
, atomic
, async
, write_fault
, writable
);
1160 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1162 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1164 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1166 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1167 bool write_fault
, bool *writable
)
1169 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1171 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1173 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1175 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1177 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1179 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1182 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1184 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1186 pfn_t
gfn_to_pfn_memslot(struct kvm
*kvm
,
1187 struct kvm_memory_slot
*slot
, gfn_t gfn
)
1189 unsigned long addr
= gfn_to_hva_memslot(slot
, gfn
);
1190 return hva_to_pfn(kvm
, addr
, false, NULL
, true, NULL
);
1193 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1199 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1200 if (kvm_is_error_hva(addr
))
1203 if (entry
< nr_pages
)
1206 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1208 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1210 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1214 pfn
= gfn_to_pfn(kvm
, gfn
);
1215 if (!kvm_is_mmio_pfn(pfn
))
1216 return pfn_to_page(pfn
);
1218 WARN_ON(kvm_is_mmio_pfn(pfn
));
1224 EXPORT_SYMBOL_GPL(gfn_to_page
);
1226 void kvm_release_page_clean(struct page
*page
)
1228 kvm_release_pfn_clean(page_to_pfn(page
));
1230 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1232 void kvm_release_pfn_clean(pfn_t pfn
)
1234 if (!kvm_is_mmio_pfn(pfn
))
1235 put_page(pfn_to_page(pfn
));
1237 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1239 void kvm_release_page_dirty(struct page
*page
)
1241 kvm_release_pfn_dirty(page_to_pfn(page
));
1243 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1245 void kvm_release_pfn_dirty(pfn_t pfn
)
1247 kvm_set_pfn_dirty(pfn
);
1248 kvm_release_pfn_clean(pfn
);
1250 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1252 void kvm_set_page_dirty(struct page
*page
)
1254 kvm_set_pfn_dirty(page_to_pfn(page
));
1256 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1258 void kvm_set_pfn_dirty(pfn_t pfn
)
1260 if (!kvm_is_mmio_pfn(pfn
)) {
1261 struct page
*page
= pfn_to_page(pfn
);
1262 if (!PageReserved(page
))
1266 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1268 void kvm_set_pfn_accessed(pfn_t pfn
)
1270 if (!kvm_is_mmio_pfn(pfn
))
1271 mark_page_accessed(pfn_to_page(pfn
));
1273 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1275 void kvm_get_pfn(pfn_t pfn
)
1277 if (!kvm_is_mmio_pfn(pfn
))
1278 get_page(pfn_to_page(pfn
));
1280 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1282 static int next_segment(unsigned long len
, int offset
)
1284 if (len
> PAGE_SIZE
- offset
)
1285 return PAGE_SIZE
- offset
;
1290 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1296 addr
= gfn_to_hva(kvm
, gfn
);
1297 if (kvm_is_error_hva(addr
))
1299 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1304 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1306 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1308 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1310 int offset
= offset_in_page(gpa
);
1313 while ((seg
= next_segment(len
, offset
)) != 0) {
1314 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1324 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1326 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1331 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1332 int offset
= offset_in_page(gpa
);
1334 addr
= gfn_to_hva(kvm
, gfn
);
1335 if (kvm_is_error_hva(addr
))
1337 pagefault_disable();
1338 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1344 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1346 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1347 int offset
, int len
)
1352 addr
= gfn_to_hva(kvm
, gfn
);
1353 if (kvm_is_error_hva(addr
))
1355 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1358 mark_page_dirty(kvm
, gfn
);
1361 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1363 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1366 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1368 int offset
= offset_in_page(gpa
);
1371 while ((seg
= next_segment(len
, offset
)) != 0) {
1372 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1383 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1386 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1387 int offset
= offset_in_page(gpa
);
1388 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1391 ghc
->generation
= slots
->generation
;
1392 ghc
->memslot
= gfn_to_memslot(kvm
, gfn
);
1393 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, gfn
, NULL
);
1394 if (!kvm_is_error_hva(ghc
->hva
))
1401 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1403 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1404 void *data
, unsigned long len
)
1406 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1409 if (slots
->generation
!= ghc
->generation
)
1410 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1412 if (kvm_is_error_hva(ghc
->hva
))
1415 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1418 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1422 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1424 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1425 void *data
, unsigned long len
)
1427 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1430 if (slots
->generation
!= ghc
->generation
)
1431 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1433 if (kvm_is_error_hva(ghc
->hva
))
1436 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1442 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1444 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1446 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1449 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1451 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1453 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1455 int offset
= offset_in_page(gpa
);
1458 while ((seg
= next_segment(len
, offset
)) != 0) {
1459 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1468 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1470 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1473 if (memslot
&& memslot
->dirty_bitmap
) {
1474 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1476 /* TODO: introduce set_bit_le() and use it */
1477 test_and_set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1481 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1483 struct kvm_memory_slot
*memslot
;
1485 memslot
= gfn_to_memslot(kvm
, gfn
);
1486 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1490 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1492 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1497 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1499 if (kvm_arch_vcpu_runnable(vcpu
)) {
1500 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1503 if (kvm_cpu_has_pending_timer(vcpu
))
1505 if (signal_pending(current
))
1511 finish_wait(&vcpu
->wq
, &wait
);
1516 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1518 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1521 int cpu
= vcpu
->cpu
;
1522 wait_queue_head_t
*wqp
;
1524 wqp
= kvm_arch_vcpu_wq(vcpu
);
1525 if (waitqueue_active(wqp
)) {
1526 wake_up_interruptible(wqp
);
1527 ++vcpu
->stat
.halt_wakeup
;
1531 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1532 if (kvm_arch_vcpu_should_kick(vcpu
))
1533 smp_send_reschedule(cpu
);
1536 #endif /* !CONFIG_S390 */
1538 void kvm_resched(struct kvm_vcpu
*vcpu
)
1540 if (!need_resched())
1544 EXPORT_SYMBOL_GPL(kvm_resched
);
1546 bool kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1549 struct task_struct
*task
= NULL
;
1552 pid
= rcu_dereference(target
->pid
);
1554 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1558 if (task
->flags
& PF_VCPU
) {
1559 put_task_struct(task
);
1562 if (yield_to(task
, 1)) {
1563 put_task_struct(task
);
1566 put_task_struct(task
);
1569 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1571 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1573 struct kvm
*kvm
= me
->kvm
;
1574 struct kvm_vcpu
*vcpu
;
1575 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1581 * We boost the priority of a VCPU that is runnable but not
1582 * currently running, because it got preempted by something
1583 * else and called schedule in __vcpu_run. Hopefully that
1584 * VCPU is holding the lock that we need and will release it.
1585 * We approximate round-robin by starting at the last boosted VCPU.
1587 for (pass
= 0; pass
< 2 && !yielded
; pass
++) {
1588 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1589 if (!pass
&& i
< last_boosted_vcpu
) {
1590 i
= last_boosted_vcpu
;
1592 } else if (pass
&& i
> last_boosted_vcpu
)
1596 if (waitqueue_active(&vcpu
->wq
))
1598 if (kvm_vcpu_yield_to(vcpu
)) {
1599 kvm
->last_boosted_vcpu
= i
;
1606 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1608 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1610 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1613 if (vmf
->pgoff
== 0)
1614 page
= virt_to_page(vcpu
->run
);
1616 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1617 page
= virt_to_page(vcpu
->arch
.pio_data
);
1619 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1620 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1621 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1624 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1630 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1631 .fault
= kvm_vcpu_fault
,
1634 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1636 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1640 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1642 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1644 kvm_put_kvm(vcpu
->kvm
);
1648 static struct file_operations kvm_vcpu_fops
= {
1649 .release
= kvm_vcpu_release
,
1650 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1651 #ifdef CONFIG_COMPAT
1652 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1654 .mmap
= kvm_vcpu_mmap
,
1655 .llseek
= noop_llseek
,
1659 * Allocates an inode for the vcpu.
1661 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1663 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1667 * Creates some virtual cpus. Good luck creating more than one.
1669 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1672 struct kvm_vcpu
*vcpu
, *v
;
1674 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1676 return PTR_ERR(vcpu
);
1678 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1680 r
= kvm_arch_vcpu_setup(vcpu
);
1684 mutex_lock(&kvm
->lock
);
1685 if (!kvm_vcpu_compatible(vcpu
)) {
1687 goto unlock_vcpu_destroy
;
1689 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1691 goto unlock_vcpu_destroy
;
1694 kvm_for_each_vcpu(r
, v
, kvm
)
1695 if (v
->vcpu_id
== id
) {
1697 goto unlock_vcpu_destroy
;
1700 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1702 /* Now it's all set up, let userspace reach it */
1704 r
= create_vcpu_fd(vcpu
);
1707 goto unlock_vcpu_destroy
;
1710 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1712 atomic_inc(&kvm
->online_vcpus
);
1714 mutex_unlock(&kvm
->lock
);
1717 unlock_vcpu_destroy
:
1718 mutex_unlock(&kvm
->lock
);
1720 kvm_arch_vcpu_destroy(vcpu
);
1724 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1727 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1728 vcpu
->sigset_active
= 1;
1729 vcpu
->sigset
= *sigset
;
1731 vcpu
->sigset_active
= 0;
1735 static long kvm_vcpu_ioctl(struct file
*filp
,
1736 unsigned int ioctl
, unsigned long arg
)
1738 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1739 void __user
*argp
= (void __user
*)arg
;
1741 struct kvm_fpu
*fpu
= NULL
;
1742 struct kvm_sregs
*kvm_sregs
= NULL
;
1744 if (vcpu
->kvm
->mm
!= current
->mm
)
1747 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1749 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1750 * so vcpu_load() would break it.
1752 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1753 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1763 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1764 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1766 case KVM_GET_REGS
: {
1767 struct kvm_regs
*kvm_regs
;
1770 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1773 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1777 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1784 case KVM_SET_REGS
: {
1785 struct kvm_regs
*kvm_regs
;
1788 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
1789 if (IS_ERR(kvm_regs
)) {
1790 r
= PTR_ERR(kvm_regs
);
1793 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1801 case KVM_GET_SREGS
: {
1802 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1806 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1810 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1815 case KVM_SET_SREGS
: {
1816 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
1817 if (IS_ERR(kvm_sregs
)) {
1818 r
= PTR_ERR(kvm_sregs
);
1821 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1827 case KVM_GET_MP_STATE
: {
1828 struct kvm_mp_state mp_state
;
1830 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1834 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1839 case KVM_SET_MP_STATE
: {
1840 struct kvm_mp_state mp_state
;
1843 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
1845 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
1851 case KVM_TRANSLATE
: {
1852 struct kvm_translation tr
;
1855 if (copy_from_user(&tr
, argp
, sizeof tr
))
1857 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
1861 if (copy_to_user(argp
, &tr
, sizeof tr
))
1866 case KVM_SET_GUEST_DEBUG
: {
1867 struct kvm_guest_debug dbg
;
1870 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
1872 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
1878 case KVM_SET_SIGNAL_MASK
: {
1879 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1880 struct kvm_signal_mask kvm_sigmask
;
1881 sigset_t sigset
, *p
;
1886 if (copy_from_user(&kvm_sigmask
, argp
,
1887 sizeof kvm_sigmask
))
1890 if (kvm_sigmask
.len
!= sizeof sigset
)
1893 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
1898 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
1902 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
1906 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
1910 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
1916 fpu
= memdup_user(argp
, sizeof(*fpu
));
1921 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
1928 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1937 #ifdef CONFIG_COMPAT
1938 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
1939 unsigned int ioctl
, unsigned long arg
)
1941 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1942 void __user
*argp
= compat_ptr(arg
);
1945 if (vcpu
->kvm
->mm
!= current
->mm
)
1949 case KVM_SET_SIGNAL_MASK
: {
1950 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
1951 struct kvm_signal_mask kvm_sigmask
;
1952 compat_sigset_t csigset
;
1957 if (copy_from_user(&kvm_sigmask
, argp
,
1958 sizeof kvm_sigmask
))
1961 if (kvm_sigmask
.len
!= sizeof csigset
)
1964 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
1968 sigset_from_compat(&sigset
, &csigset
);
1969 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
1973 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
1981 static long kvm_vm_ioctl(struct file
*filp
,
1982 unsigned int ioctl
, unsigned long arg
)
1984 struct kvm
*kvm
= filp
->private_data
;
1985 void __user
*argp
= (void __user
*)arg
;
1988 if (kvm
->mm
!= current
->mm
)
1991 case KVM_CREATE_VCPU
:
1992 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
1996 case KVM_SET_USER_MEMORY_REGION
: {
1997 struct kvm_userspace_memory_region kvm_userspace_mem
;
2000 if (copy_from_user(&kvm_userspace_mem
, argp
,
2001 sizeof kvm_userspace_mem
))
2004 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, 1);
2009 case KVM_GET_DIRTY_LOG
: {
2010 struct kvm_dirty_log log
;
2013 if (copy_from_user(&log
, argp
, sizeof log
))
2015 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2020 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2021 case KVM_REGISTER_COALESCED_MMIO
: {
2022 struct kvm_coalesced_mmio_zone zone
;
2024 if (copy_from_user(&zone
, argp
, sizeof zone
))
2026 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2032 case KVM_UNREGISTER_COALESCED_MMIO
: {
2033 struct kvm_coalesced_mmio_zone zone
;
2035 if (copy_from_user(&zone
, argp
, sizeof zone
))
2037 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2045 struct kvm_irqfd data
;
2048 if (copy_from_user(&data
, argp
, sizeof data
))
2050 r
= kvm_irqfd(kvm
, data
.fd
, data
.gsi
, data
.flags
);
2053 case KVM_IOEVENTFD
: {
2054 struct kvm_ioeventfd data
;
2057 if (copy_from_user(&data
, argp
, sizeof data
))
2059 r
= kvm_ioeventfd(kvm
, &data
);
2062 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2063 case KVM_SET_BOOT_CPU_ID
:
2065 mutex_lock(&kvm
->lock
);
2066 if (atomic_read(&kvm
->online_vcpus
) != 0)
2069 kvm
->bsp_vcpu_id
= arg
;
2070 mutex_unlock(&kvm
->lock
);
2073 #ifdef CONFIG_HAVE_KVM_MSI
2074 case KVM_SIGNAL_MSI
: {
2078 if (copy_from_user(&msi
, argp
, sizeof msi
))
2080 r
= kvm_send_userspace_msi(kvm
, &msi
);
2085 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2087 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2093 #ifdef CONFIG_COMPAT
2094 struct compat_kvm_dirty_log
{
2098 compat_uptr_t dirty_bitmap
; /* one bit per page */
2103 static long kvm_vm_compat_ioctl(struct file
*filp
,
2104 unsigned int ioctl
, unsigned long arg
)
2106 struct kvm
*kvm
= filp
->private_data
;
2109 if (kvm
->mm
!= current
->mm
)
2112 case KVM_GET_DIRTY_LOG
: {
2113 struct compat_kvm_dirty_log compat_log
;
2114 struct kvm_dirty_log log
;
2117 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2118 sizeof(compat_log
)))
2120 log
.slot
= compat_log
.slot
;
2121 log
.padding1
= compat_log
.padding1
;
2122 log
.padding2
= compat_log
.padding2
;
2123 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2125 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2131 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2139 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2141 struct page
*page
[1];
2144 gfn_t gfn
= vmf
->pgoff
;
2145 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2147 addr
= gfn_to_hva(kvm
, gfn
);
2148 if (kvm_is_error_hva(addr
))
2149 return VM_FAULT_SIGBUS
;
2151 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2153 if (unlikely(npages
!= 1))
2154 return VM_FAULT_SIGBUS
;
2156 vmf
->page
= page
[0];
2160 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2161 .fault
= kvm_vm_fault
,
2164 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2166 vma
->vm_ops
= &kvm_vm_vm_ops
;
2170 static struct file_operations kvm_vm_fops
= {
2171 .release
= kvm_vm_release
,
2172 .unlocked_ioctl
= kvm_vm_ioctl
,
2173 #ifdef CONFIG_COMPAT
2174 .compat_ioctl
= kvm_vm_compat_ioctl
,
2176 .mmap
= kvm_vm_mmap
,
2177 .llseek
= noop_llseek
,
2180 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2185 kvm
= kvm_create_vm(type
);
2187 return PTR_ERR(kvm
);
2188 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2189 r
= kvm_coalesced_mmio_init(kvm
);
2195 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2202 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2205 case KVM_CAP_USER_MEMORY
:
2206 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2207 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2208 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2209 case KVM_CAP_SET_BOOT_CPU_ID
:
2211 case KVM_CAP_INTERNAL_ERROR_DATA
:
2212 #ifdef CONFIG_HAVE_KVM_MSI
2213 case KVM_CAP_SIGNAL_MSI
:
2216 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2217 case KVM_CAP_IRQ_ROUTING
:
2218 return KVM_MAX_IRQ_ROUTES
;
2223 return kvm_dev_ioctl_check_extension(arg
);
2226 static long kvm_dev_ioctl(struct file
*filp
,
2227 unsigned int ioctl
, unsigned long arg
)
2232 case KVM_GET_API_VERSION
:
2236 r
= KVM_API_VERSION
;
2239 r
= kvm_dev_ioctl_create_vm(arg
);
2241 case KVM_CHECK_EXTENSION
:
2242 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2244 case KVM_GET_VCPU_MMAP_SIZE
:
2248 r
= PAGE_SIZE
; /* struct kvm_run */
2250 r
+= PAGE_SIZE
; /* pio data page */
2252 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2253 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2256 case KVM_TRACE_ENABLE
:
2257 case KVM_TRACE_PAUSE
:
2258 case KVM_TRACE_DISABLE
:
2262 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2268 static struct file_operations kvm_chardev_ops
= {
2269 .unlocked_ioctl
= kvm_dev_ioctl
,
2270 .compat_ioctl
= kvm_dev_ioctl
,
2271 .llseek
= noop_llseek
,
2274 static struct miscdevice kvm_dev
= {
2280 static void hardware_enable_nolock(void *junk
)
2282 int cpu
= raw_smp_processor_id();
2285 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2288 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2290 r
= kvm_arch_hardware_enable(NULL
);
2293 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2294 atomic_inc(&hardware_enable_failed
);
2295 printk(KERN_INFO
"kvm: enabling virtualization on "
2296 "CPU%d failed\n", cpu
);
2300 static void hardware_enable(void *junk
)
2302 raw_spin_lock(&kvm_lock
);
2303 hardware_enable_nolock(junk
);
2304 raw_spin_unlock(&kvm_lock
);
2307 static void hardware_disable_nolock(void *junk
)
2309 int cpu
= raw_smp_processor_id();
2311 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2313 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2314 kvm_arch_hardware_disable(NULL
);
2317 static void hardware_disable(void *junk
)
2319 raw_spin_lock(&kvm_lock
);
2320 hardware_disable_nolock(junk
);
2321 raw_spin_unlock(&kvm_lock
);
2324 static void hardware_disable_all_nolock(void)
2326 BUG_ON(!kvm_usage_count
);
2329 if (!kvm_usage_count
)
2330 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2333 static void hardware_disable_all(void)
2335 raw_spin_lock(&kvm_lock
);
2336 hardware_disable_all_nolock();
2337 raw_spin_unlock(&kvm_lock
);
2340 static int hardware_enable_all(void)
2344 raw_spin_lock(&kvm_lock
);
2347 if (kvm_usage_count
== 1) {
2348 atomic_set(&hardware_enable_failed
, 0);
2349 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2351 if (atomic_read(&hardware_enable_failed
)) {
2352 hardware_disable_all_nolock();
2357 raw_spin_unlock(&kvm_lock
);
2362 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2367 if (!kvm_usage_count
)
2370 val
&= ~CPU_TASKS_FROZEN
;
2373 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2375 hardware_disable(NULL
);
2378 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2380 hardware_enable(NULL
);
2387 asmlinkage
void kvm_spurious_fault(void)
2389 /* Fault while not rebooting. We want the trace. */
2392 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
2394 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2398 * Some (well, at least mine) BIOSes hang on reboot if
2401 * And Intel TXT required VMX off for all cpu when system shutdown.
2403 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2404 kvm_rebooting
= true;
2405 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2409 static struct notifier_block kvm_reboot_notifier
= {
2410 .notifier_call
= kvm_reboot
,
2414 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2418 for (i
= 0; i
< bus
->dev_count
; i
++) {
2419 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2421 kvm_iodevice_destructor(pos
);
2426 int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2428 const struct kvm_io_range
*r1
= p1
;
2429 const struct kvm_io_range
*r2
= p2
;
2431 if (r1
->addr
< r2
->addr
)
2433 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2438 int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2439 gpa_t addr
, int len
)
2441 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2447 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2448 kvm_io_bus_sort_cmp
, NULL
);
2453 int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2454 gpa_t addr
, int len
)
2456 struct kvm_io_range
*range
, key
;
2459 key
= (struct kvm_io_range
) {
2464 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2465 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2469 off
= range
- bus
->range
;
2471 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2477 /* kvm_io_bus_write - called under kvm->slots_lock */
2478 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2479 int len
, const void *val
)
2482 struct kvm_io_bus
*bus
;
2483 struct kvm_io_range range
;
2485 range
= (struct kvm_io_range
) {
2490 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2491 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2495 while (idx
< bus
->dev_count
&&
2496 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2497 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2505 /* kvm_io_bus_read - called under kvm->slots_lock */
2506 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2510 struct kvm_io_bus
*bus
;
2511 struct kvm_io_range range
;
2513 range
= (struct kvm_io_range
) {
2518 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2519 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2523 while (idx
< bus
->dev_count
&&
2524 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2525 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2533 /* Caller must hold slots_lock. */
2534 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2535 int len
, struct kvm_io_device
*dev
)
2537 struct kvm_io_bus
*new_bus
, *bus
;
2539 bus
= kvm
->buses
[bus_idx
];
2540 if (bus
->dev_count
> NR_IOBUS_DEVS
- 1)
2543 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2544 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2547 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
2548 sizeof(struct kvm_io_range
)));
2549 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2550 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2551 synchronize_srcu_expedited(&kvm
->srcu
);
2557 /* Caller must hold slots_lock. */
2558 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2559 struct kvm_io_device
*dev
)
2562 struct kvm_io_bus
*new_bus
, *bus
;
2564 bus
= kvm
->buses
[bus_idx
];
2566 for (i
= 0; i
< bus
->dev_count
; i
++)
2567 if (bus
->range
[i
].dev
== dev
) {
2575 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
2576 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2580 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
2581 new_bus
->dev_count
--;
2582 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
2583 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
2585 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2586 synchronize_srcu_expedited(&kvm
->srcu
);
2591 static struct notifier_block kvm_cpu_notifier
= {
2592 .notifier_call
= kvm_cpu_hotplug
,
2595 static int vm_stat_get(void *_offset
, u64
*val
)
2597 unsigned offset
= (long)_offset
;
2601 raw_spin_lock(&kvm_lock
);
2602 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2603 *val
+= *(u32
*)((void *)kvm
+ offset
);
2604 raw_spin_unlock(&kvm_lock
);
2608 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2610 static int vcpu_stat_get(void *_offset
, u64
*val
)
2612 unsigned offset
= (long)_offset
;
2614 struct kvm_vcpu
*vcpu
;
2618 raw_spin_lock(&kvm_lock
);
2619 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2620 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2621 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2623 raw_spin_unlock(&kvm_lock
);
2627 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2629 static const struct file_operations
*stat_fops
[] = {
2630 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2631 [KVM_STAT_VM
] = &vm_stat_fops
,
2634 static int kvm_init_debug(void)
2637 struct kvm_stats_debugfs_item
*p
;
2639 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2640 if (kvm_debugfs_dir
== NULL
)
2643 for (p
= debugfs_entries
; p
->name
; ++p
) {
2644 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2645 (void *)(long)p
->offset
,
2646 stat_fops
[p
->kind
]);
2647 if (p
->dentry
== NULL
)
2654 debugfs_remove_recursive(kvm_debugfs_dir
);
2659 static void kvm_exit_debug(void)
2661 struct kvm_stats_debugfs_item
*p
;
2663 for (p
= debugfs_entries
; p
->name
; ++p
)
2664 debugfs_remove(p
->dentry
);
2665 debugfs_remove(kvm_debugfs_dir
);
2668 static int kvm_suspend(void)
2670 if (kvm_usage_count
)
2671 hardware_disable_nolock(NULL
);
2675 static void kvm_resume(void)
2677 if (kvm_usage_count
) {
2678 WARN_ON(raw_spin_is_locked(&kvm_lock
));
2679 hardware_enable_nolock(NULL
);
2683 static struct syscore_ops kvm_syscore_ops
= {
2684 .suspend
= kvm_suspend
,
2685 .resume
= kvm_resume
,
2688 struct page
*bad_page
;
2692 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2694 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2697 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2699 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2701 kvm_arch_vcpu_load(vcpu
, cpu
);
2704 static void kvm_sched_out(struct preempt_notifier
*pn
,
2705 struct task_struct
*next
)
2707 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2709 kvm_arch_vcpu_put(vcpu
);
2712 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2713 struct module
*module
)
2718 r
= kvm_arch_init(opaque
);
2722 bad_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2724 if (bad_page
== NULL
) {
2729 bad_pfn
= page_to_pfn(bad_page
);
2731 hwpoison_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2733 if (hwpoison_page
== NULL
) {
2738 hwpoison_pfn
= page_to_pfn(hwpoison_page
);
2740 fault_page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
2742 if (fault_page
== NULL
) {
2747 fault_pfn
= page_to_pfn(fault_page
);
2749 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2754 r
= kvm_arch_hardware_setup();
2758 for_each_online_cpu(cpu
) {
2759 smp_call_function_single(cpu
,
2760 kvm_arch_check_processor_compat
,
2766 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2769 register_reboot_notifier(&kvm_reboot_notifier
);
2771 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2773 vcpu_align
= __alignof__(struct kvm_vcpu
);
2774 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2776 if (!kvm_vcpu_cache
) {
2781 r
= kvm_async_pf_init();
2785 kvm_chardev_ops
.owner
= module
;
2786 kvm_vm_fops
.owner
= module
;
2787 kvm_vcpu_fops
.owner
= module
;
2789 r
= misc_register(&kvm_dev
);
2791 printk(KERN_ERR
"kvm: misc device register failed\n");
2795 register_syscore_ops(&kvm_syscore_ops
);
2797 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2798 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2800 r
= kvm_init_debug();
2802 printk(KERN_ERR
"kvm: create debugfs files failed\n");
2809 unregister_syscore_ops(&kvm_syscore_ops
);
2811 kvm_async_pf_deinit();
2813 kmem_cache_destroy(kvm_vcpu_cache
);
2815 unregister_reboot_notifier(&kvm_reboot_notifier
);
2816 unregister_cpu_notifier(&kvm_cpu_notifier
);
2819 kvm_arch_hardware_unsetup();
2821 free_cpumask_var(cpus_hardware_enabled
);
2824 __free_page(fault_page
);
2826 __free_page(hwpoison_page
);
2827 __free_page(bad_page
);
2833 EXPORT_SYMBOL_GPL(kvm_init
);
2838 misc_deregister(&kvm_dev
);
2839 kmem_cache_destroy(kvm_vcpu_cache
);
2840 kvm_async_pf_deinit();
2841 unregister_syscore_ops(&kvm_syscore_ops
);
2842 unregister_reboot_notifier(&kvm_reboot_notifier
);
2843 unregister_cpu_notifier(&kvm_cpu_notifier
);
2844 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2845 kvm_arch_hardware_unsetup();
2847 free_cpumask_var(cpus_hardware_enabled
);
2848 __free_page(hwpoison_page
);
2849 __free_page(bad_page
);
2851 EXPORT_SYMBOL_GPL(kvm_exit
);