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 bool kvm_is_mmio_pfn(pfn_t pfn
)
105 if (pfn_valid(pfn
)) {
107 struct page
*tail
= pfn_to_page(pfn
);
108 struct page
*head
= compound_trans_head(tail
);
109 reserved
= PageReserved(head
);
112 * "head" is not a dangling pointer
113 * (compound_trans_head takes care of that)
114 * but the hugepage may have been splitted
115 * from under us (and we may not hold a
116 * reference count on the head page so it can
117 * be reused before we run PageReferenced), so
118 * we've to check PageTail before returning
125 return PageReserved(tail
);
132 * Switches to specified vcpu, until a matching vcpu_put()
134 int vcpu_load(struct kvm_vcpu
*vcpu
)
138 if (mutex_lock_killable(&vcpu
->mutex
))
140 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
141 /* The thread running this VCPU changed. */
142 struct pid
*oldpid
= vcpu
->pid
;
143 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
144 rcu_assign_pointer(vcpu
->pid
, newpid
);
149 preempt_notifier_register(&vcpu
->preempt_notifier
);
150 kvm_arch_vcpu_load(vcpu
, cpu
);
155 void vcpu_put(struct kvm_vcpu
*vcpu
)
158 kvm_arch_vcpu_put(vcpu
);
159 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
161 mutex_unlock(&vcpu
->mutex
);
164 static void ack_flush(void *_completed
)
168 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
173 struct kvm_vcpu
*vcpu
;
175 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
178 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
179 kvm_make_request(req
, vcpu
);
182 /* Set ->requests bit before we read ->mode */
185 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
186 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
187 cpumask_set_cpu(cpu
, cpus
);
189 if (unlikely(cpus
== NULL
))
190 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
191 else if (!cpumask_empty(cpus
))
192 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
196 free_cpumask_var(cpus
);
200 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
202 long dirty_count
= kvm
->tlbs_dirty
;
205 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
206 ++kvm
->stat
.remote_tlb_flush
;
207 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
210 void kvm_reload_remote_mmus(struct kvm
*kvm
)
212 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
215 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
217 make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
220 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
225 mutex_init(&vcpu
->mutex
);
230 init_waitqueue_head(&vcpu
->wq
);
231 kvm_async_pf_vcpu_init(vcpu
);
233 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
238 vcpu
->run
= page_address(page
);
240 kvm_vcpu_set_in_spin_loop(vcpu
, false);
241 kvm_vcpu_set_dy_eligible(vcpu
, false);
243 r
= kvm_arch_vcpu_init(vcpu
);
249 free_page((unsigned long)vcpu
->run
);
253 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
255 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
258 kvm_arch_vcpu_uninit(vcpu
);
259 free_page((unsigned long)vcpu
->run
);
261 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
263 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
264 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
266 return container_of(mn
, struct kvm
, mmu_notifier
);
269 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
270 struct mm_struct
*mm
,
271 unsigned long address
)
273 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
274 int need_tlb_flush
, idx
;
277 * When ->invalidate_page runs, the linux pte has been zapped
278 * already but the page is still allocated until
279 * ->invalidate_page returns. So if we increase the sequence
280 * here the kvm page fault will notice if the spte can't be
281 * established because the page is going to be freed. If
282 * instead the kvm page fault establishes the spte before
283 * ->invalidate_page runs, kvm_unmap_hva will release it
286 * The sequence increase only need to be seen at spin_unlock
287 * time, and not at spin_lock time.
289 * Increasing the sequence after the spin_unlock would be
290 * unsafe because the kvm page fault could then establish the
291 * pte after kvm_unmap_hva returned, without noticing the page
292 * is going to be freed.
294 idx
= srcu_read_lock(&kvm
->srcu
);
295 spin_lock(&kvm
->mmu_lock
);
297 kvm
->mmu_notifier_seq
++;
298 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
299 /* we've to flush the tlb before the pages can be freed */
301 kvm_flush_remote_tlbs(kvm
);
303 spin_unlock(&kvm
->mmu_lock
);
304 srcu_read_unlock(&kvm
->srcu
, idx
);
307 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
308 struct mm_struct
*mm
,
309 unsigned long address
,
312 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
315 idx
= srcu_read_lock(&kvm
->srcu
);
316 spin_lock(&kvm
->mmu_lock
);
317 kvm
->mmu_notifier_seq
++;
318 kvm_set_spte_hva(kvm
, address
, pte
);
319 spin_unlock(&kvm
->mmu_lock
);
320 srcu_read_unlock(&kvm
->srcu
, idx
);
323 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
324 struct mm_struct
*mm
,
328 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
329 int need_tlb_flush
= 0, idx
;
331 idx
= srcu_read_lock(&kvm
->srcu
);
332 spin_lock(&kvm
->mmu_lock
);
334 * The count increase must become visible at unlock time as no
335 * spte can be established without taking the mmu_lock and
336 * count is also read inside the mmu_lock critical section.
338 kvm
->mmu_notifier_count
++;
339 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
340 need_tlb_flush
|= kvm
->tlbs_dirty
;
341 /* we've to flush the tlb before the pages can be freed */
343 kvm_flush_remote_tlbs(kvm
);
345 spin_unlock(&kvm
->mmu_lock
);
346 srcu_read_unlock(&kvm
->srcu
, idx
);
349 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
350 struct mm_struct
*mm
,
354 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
356 spin_lock(&kvm
->mmu_lock
);
358 * This sequence increase will notify the kvm page fault that
359 * the page that is going to be mapped in the spte could have
362 kvm
->mmu_notifier_seq
++;
365 * The above sequence increase must be visible before the
366 * below count decrease, which is ensured by the smp_wmb above
367 * in conjunction with the smp_rmb in mmu_notifier_retry().
369 kvm
->mmu_notifier_count
--;
370 spin_unlock(&kvm
->mmu_lock
);
372 BUG_ON(kvm
->mmu_notifier_count
< 0);
375 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
376 struct mm_struct
*mm
,
377 unsigned long address
)
379 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
382 idx
= srcu_read_lock(&kvm
->srcu
);
383 spin_lock(&kvm
->mmu_lock
);
385 young
= kvm_age_hva(kvm
, address
);
387 kvm_flush_remote_tlbs(kvm
);
389 spin_unlock(&kvm
->mmu_lock
);
390 srcu_read_unlock(&kvm
->srcu
, idx
);
395 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
396 struct mm_struct
*mm
,
397 unsigned long address
)
399 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
402 idx
= srcu_read_lock(&kvm
->srcu
);
403 spin_lock(&kvm
->mmu_lock
);
404 young
= kvm_test_age_hva(kvm
, address
);
405 spin_unlock(&kvm
->mmu_lock
);
406 srcu_read_unlock(&kvm
->srcu
, idx
);
411 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
412 struct mm_struct
*mm
)
414 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
417 idx
= srcu_read_lock(&kvm
->srcu
);
418 kvm_arch_flush_shadow_all(kvm
);
419 srcu_read_unlock(&kvm
->srcu
, idx
);
422 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
423 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
424 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
425 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
426 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
427 .test_young
= kvm_mmu_notifier_test_young
,
428 .change_pte
= kvm_mmu_notifier_change_pte
,
429 .release
= kvm_mmu_notifier_release
,
432 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
434 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
435 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
438 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
440 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
445 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
447 static void kvm_init_memslots_id(struct kvm
*kvm
)
450 struct kvm_memslots
*slots
= kvm
->memslots
;
452 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
453 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
456 static struct kvm
*kvm_create_vm(unsigned long type
)
459 struct kvm
*kvm
= kvm_arch_alloc_vm();
462 return ERR_PTR(-ENOMEM
);
464 r
= kvm_arch_init_vm(kvm
, type
);
466 goto out_err_nodisable
;
468 r
= hardware_enable_all();
470 goto out_err_nodisable
;
472 #ifdef CONFIG_HAVE_KVM_IRQCHIP
473 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
474 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
477 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
480 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
483 kvm_init_memslots_id(kvm
);
484 if (init_srcu_struct(&kvm
->srcu
))
486 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
487 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
493 spin_lock_init(&kvm
->mmu_lock
);
494 kvm
->mm
= current
->mm
;
495 atomic_inc(&kvm
->mm
->mm_count
);
496 kvm_eventfd_init(kvm
);
497 mutex_init(&kvm
->lock
);
498 mutex_init(&kvm
->irq_lock
);
499 mutex_init(&kvm
->slots_lock
);
500 atomic_set(&kvm
->users_count
, 1);
502 r
= kvm_init_mmu_notifier(kvm
);
506 raw_spin_lock(&kvm_lock
);
507 list_add(&kvm
->vm_list
, &vm_list
);
508 raw_spin_unlock(&kvm_lock
);
513 cleanup_srcu_struct(&kvm
->srcu
);
515 hardware_disable_all();
517 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
518 kfree(kvm
->buses
[i
]);
519 kfree(kvm
->memslots
);
520 kvm_arch_free_vm(kvm
);
525 * Avoid using vmalloc for a small buffer.
526 * Should not be used when the size is statically known.
528 void *kvm_kvzalloc(unsigned long size
)
530 if (size
> PAGE_SIZE
)
531 return vzalloc(size
);
533 return kzalloc(size
, GFP_KERNEL
);
536 void kvm_kvfree(const void *addr
)
538 if (is_vmalloc_addr(addr
))
544 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
546 if (!memslot
->dirty_bitmap
)
549 kvm_kvfree(memslot
->dirty_bitmap
);
550 memslot
->dirty_bitmap
= NULL
;
554 * Free any memory in @free but not in @dont.
556 static void kvm_free_physmem_slot(struct kvm_memory_slot
*free
,
557 struct kvm_memory_slot
*dont
)
559 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
560 kvm_destroy_dirty_bitmap(free
);
562 kvm_arch_free_memslot(free
, dont
);
567 void kvm_free_physmem(struct kvm
*kvm
)
569 struct kvm_memslots
*slots
= kvm
->memslots
;
570 struct kvm_memory_slot
*memslot
;
572 kvm_for_each_memslot(memslot
, slots
)
573 kvm_free_physmem_slot(memslot
, NULL
);
575 kfree(kvm
->memslots
);
578 static void kvm_destroy_vm(struct kvm
*kvm
)
581 struct mm_struct
*mm
= kvm
->mm
;
583 kvm_arch_sync_events(kvm
);
584 raw_spin_lock(&kvm_lock
);
585 list_del(&kvm
->vm_list
);
586 raw_spin_unlock(&kvm_lock
);
587 kvm_free_irq_routing(kvm
);
588 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
589 kvm_io_bus_destroy(kvm
->buses
[i
]);
590 kvm_coalesced_mmio_free(kvm
);
591 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
592 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
594 kvm_arch_flush_shadow_all(kvm
);
596 kvm_arch_destroy_vm(kvm
);
597 kvm_free_physmem(kvm
);
598 cleanup_srcu_struct(&kvm
->srcu
);
599 kvm_arch_free_vm(kvm
);
600 hardware_disable_all();
604 void kvm_get_kvm(struct kvm
*kvm
)
606 atomic_inc(&kvm
->users_count
);
608 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
610 void kvm_put_kvm(struct kvm
*kvm
)
612 if (atomic_dec_and_test(&kvm
->users_count
))
615 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
618 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
620 struct kvm
*kvm
= filp
->private_data
;
622 kvm_irqfd_release(kvm
);
629 * Allocation size is twice as large as the actual dirty bitmap size.
630 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
632 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
635 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
637 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
638 if (!memslot
->dirty_bitmap
)
641 #endif /* !CONFIG_S390 */
645 static int cmp_memslot(const void *slot1
, const void *slot2
)
647 struct kvm_memory_slot
*s1
, *s2
;
649 s1
= (struct kvm_memory_slot
*)slot1
;
650 s2
= (struct kvm_memory_slot
*)slot2
;
652 if (s1
->npages
< s2
->npages
)
654 if (s1
->npages
> s2
->npages
)
661 * Sort the memslots base on its size, so the larger slots
662 * will get better fit.
664 static void sort_memslots(struct kvm_memslots
*slots
)
668 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
669 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
671 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
672 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
675 void update_memslots(struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
679 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
680 unsigned long npages
= old
->npages
;
683 if (new->npages
!= npages
)
684 sort_memslots(slots
);
690 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
692 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
694 #ifdef KVM_CAP_READONLY_MEM
695 valid_flags
|= KVM_MEM_READONLY
;
698 if (mem
->flags
& ~valid_flags
)
705 * Allocate some memory and give it an address in the guest physical address
708 * Discontiguous memory is allowed, mostly for framebuffers.
710 * Must be called holding mmap_sem for write.
712 int __kvm_set_memory_region(struct kvm
*kvm
,
713 struct kvm_userspace_memory_region
*mem
,
718 unsigned long npages
;
719 struct kvm_memory_slot
*memslot
, *slot
;
720 struct kvm_memory_slot old
, new;
721 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
723 r
= check_memory_region_flags(mem
);
728 /* General sanity checks */
729 if (mem
->memory_size
& (PAGE_SIZE
- 1))
731 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
733 /* We can read the guest memory with __xxx_user() later on. */
735 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
736 !access_ok(VERIFY_WRITE
,
737 (void __user
*)(unsigned long)mem
->userspace_addr
,
740 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
742 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
745 memslot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
746 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
747 npages
= mem
->memory_size
>> PAGE_SHIFT
;
750 if (npages
> KVM_MEM_MAX_NR_PAGES
)
754 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
756 new = old
= *memslot
;
759 new.base_gfn
= base_gfn
;
761 new.flags
= mem
->flags
;
764 * Disallow changing a memory slot's size or changing anything about
765 * zero sized slots that doesn't involve making them non-zero.
768 if (npages
&& old
.npages
&& npages
!= old
.npages
)
770 if (!npages
&& !old
.npages
)
773 /* Check for overlaps */
775 kvm_for_each_memslot(slot
, kvm
->memslots
) {
776 if (slot
->id
>= KVM_USER_MEM_SLOTS
|| slot
== memslot
)
778 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
779 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
783 /* Free page dirty bitmap if unneeded */
784 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
785 new.dirty_bitmap
= NULL
;
790 * Allocate if a slot is being created. If modifying a slot,
791 * the userspace_addr cannot change.
794 new.user_alloc
= user_alloc
;
795 new.userspace_addr
= mem
->userspace_addr
;
797 if (kvm_arch_create_memslot(&new, npages
))
799 } else if (npages
&& mem
->userspace_addr
!= old
.userspace_addr
) {
804 /* Allocate page dirty bitmap if needed */
805 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
806 if (kvm_create_dirty_bitmap(&new) < 0)
808 /* destroy any largepage mappings for dirty tracking */
811 if (!npages
|| base_gfn
!= old
.base_gfn
) {
812 struct kvm_memory_slot
*slot
;
815 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
819 slot
= id_to_memslot(slots
, mem
->slot
);
820 slot
->flags
|= KVM_MEMSLOT_INVALID
;
822 update_memslots(slots
, NULL
);
824 old_memslots
= kvm
->memslots
;
825 rcu_assign_pointer(kvm
->memslots
, slots
);
826 synchronize_srcu_expedited(&kvm
->srcu
);
827 /* slot was deleted or moved, clear iommu mapping */
828 kvm_iommu_unmap_pages(kvm
, &old
);
829 /* From this point no new shadow pages pointing to a deleted,
830 * or moved, memslot will be created.
832 * validation of sp->gfn happens in:
833 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
834 * - kvm_is_visible_gfn (mmu_check_roots)
836 kvm_arch_flush_shadow_memslot(kvm
, slot
);
837 slots
= old_memslots
;
840 r
= kvm_arch_prepare_memory_region(kvm
, &new, old
, mem
, user_alloc
);
846 * We can re-use the old_memslots from above, the only difference
847 * from the currently installed memslots is the invalid flag. This
848 * will get overwritten by update_memslots anyway.
851 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
857 /* map new memory slot into the iommu */
859 r
= kvm_iommu_map_pages(kvm
, &new);
864 /* actual memory is freed via old in kvm_free_physmem_slot below */
866 new.dirty_bitmap
= NULL
;
867 memset(&new.arch
, 0, sizeof(new.arch
));
870 update_memslots(slots
, &new);
871 old_memslots
= kvm
->memslots
;
872 rcu_assign_pointer(kvm
->memslots
, slots
);
873 synchronize_srcu_expedited(&kvm
->srcu
);
875 kvm_arch_commit_memory_region(kvm
, mem
, old
, user_alloc
);
877 kvm_free_physmem_slot(&old
, &new);
885 kvm_free_physmem_slot(&new, &old
);
890 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
892 int kvm_set_memory_region(struct kvm
*kvm
,
893 struct kvm_userspace_memory_region
*mem
,
898 mutex_lock(&kvm
->slots_lock
);
899 r
= __kvm_set_memory_region(kvm
, mem
, user_alloc
);
900 mutex_unlock(&kvm
->slots_lock
);
903 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
905 int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
907 kvm_userspace_memory_region
*mem
,
910 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
912 return kvm_set_memory_region(kvm
, mem
, user_alloc
);
915 int kvm_get_dirty_log(struct kvm
*kvm
,
916 struct kvm_dirty_log
*log
, int *is_dirty
)
918 struct kvm_memory_slot
*memslot
;
921 unsigned long any
= 0;
924 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
927 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
929 if (!memslot
->dirty_bitmap
)
932 n
= kvm_dirty_bitmap_bytes(memslot
);
934 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
935 any
= memslot
->dirty_bitmap
[i
];
938 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
949 bool kvm_largepages_enabled(void)
951 return largepages_enabled
;
954 void kvm_disable_largepages(void)
956 largepages_enabled
= false;
958 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
960 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
962 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
964 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
966 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
968 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
970 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
971 memslot
->flags
& KVM_MEMSLOT_INVALID
)
976 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
978 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
980 struct vm_area_struct
*vma
;
981 unsigned long addr
, size
;
985 addr
= gfn_to_hva(kvm
, gfn
);
986 if (kvm_is_error_hva(addr
))
989 down_read(¤t
->mm
->mmap_sem
);
990 vma
= find_vma(current
->mm
, addr
);
994 size
= vma_kernel_pagesize(vma
);
997 up_read(¤t
->mm
->mmap_sem
);
1002 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1004 return slot
->flags
& KVM_MEM_READONLY
;
1007 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1008 gfn_t
*nr_pages
, bool write
)
1010 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1011 return KVM_HVA_ERR_BAD
;
1013 if (memslot_is_readonly(slot
) && write
)
1014 return KVM_HVA_ERR_RO_BAD
;
1017 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1019 return __gfn_to_hva_memslot(slot
, gfn
);
1022 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1025 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1028 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1031 return gfn_to_hva_many(slot
, gfn
, NULL
);
1033 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1035 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1037 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1039 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1042 * The hva returned by this function is only allowed to be read.
1043 * It should pair with kvm_read_hva() or kvm_read_hva_atomic().
1045 static unsigned long gfn_to_hva_read(struct kvm
*kvm
, gfn_t gfn
)
1047 return __gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
, false);
1050 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1052 return __copy_from_user(data
, hva
, len
);
1055 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1057 return __copy_from_user_inatomic(data
, hva
, len
);
1060 int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1061 unsigned long start
, int write
, struct page
**page
)
1063 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1066 flags
|= FOLL_WRITE
;
1068 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1071 static inline int check_user_page_hwpoison(unsigned long addr
)
1073 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1075 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1076 flags
, NULL
, NULL
, NULL
);
1077 return rc
== -EHWPOISON
;
1081 * The atomic path to get the writable pfn which will be stored in @pfn,
1082 * true indicates success, otherwise false is returned.
1084 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1085 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1087 struct page
*page
[1];
1090 if (!(async
|| atomic
))
1094 * Fast pin a writable pfn only if it is a write fault request
1095 * or the caller allows to map a writable pfn for a read fault
1098 if (!(write_fault
|| writable
))
1101 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1103 *pfn
= page_to_pfn(page
[0]);
1114 * The slow path to get the pfn of the specified host virtual address,
1115 * 1 indicates success, -errno is returned if error is detected.
1117 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1118 bool *writable
, pfn_t
*pfn
)
1120 struct page
*page
[1];
1126 *writable
= write_fault
;
1129 down_read(¤t
->mm
->mmap_sem
);
1130 npages
= get_user_page_nowait(current
, current
->mm
,
1131 addr
, write_fault
, page
);
1132 up_read(¤t
->mm
->mmap_sem
);
1134 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1139 /* map read fault as writable if possible */
1140 if (unlikely(!write_fault
) && writable
) {
1141 struct page
*wpage
[1];
1143 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1152 *pfn
= page_to_pfn(page
[0]);
1156 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1158 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1161 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1168 * Pin guest page in memory and return its pfn.
1169 * @addr: host virtual address which maps memory to the guest
1170 * @atomic: whether this function can sleep
1171 * @async: whether this function need to wait IO complete if the
1172 * host page is not in the memory
1173 * @write_fault: whether we should get a writable host page
1174 * @writable: whether it allows to map a writable host page for !@write_fault
1176 * The function will map a writable host page for these two cases:
1177 * 1): @write_fault = true
1178 * 2): @write_fault = false && @writable, @writable will tell the caller
1179 * whether the mapping is writable.
1181 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1182 bool write_fault
, bool *writable
)
1184 struct vm_area_struct
*vma
;
1188 /* we can do it either atomically or asynchronously, not both */
1189 BUG_ON(atomic
&& async
);
1191 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1195 return KVM_PFN_ERR_FAULT
;
1197 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1201 down_read(¤t
->mm
->mmap_sem
);
1202 if (npages
== -EHWPOISON
||
1203 (!async
&& check_user_page_hwpoison(addr
))) {
1204 pfn
= KVM_PFN_ERR_HWPOISON
;
1208 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1211 pfn
= KVM_PFN_ERR_FAULT
;
1212 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1213 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1215 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1217 if (async
&& vma_is_valid(vma
, write_fault
))
1219 pfn
= KVM_PFN_ERR_FAULT
;
1222 up_read(¤t
->mm
->mmap_sem
);
1227 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1228 bool *async
, bool write_fault
, bool *writable
)
1230 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1232 if (addr
== KVM_HVA_ERR_RO_BAD
)
1233 return KVM_PFN_ERR_RO_FAULT
;
1235 if (kvm_is_error_hva(addr
))
1236 return KVM_PFN_NOSLOT
;
1238 /* Do not map writable pfn in the readonly memslot. */
1239 if (writable
&& memslot_is_readonly(slot
)) {
1244 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1248 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1249 bool write_fault
, bool *writable
)
1251 struct kvm_memory_slot
*slot
;
1256 slot
= gfn_to_memslot(kvm
, gfn
);
1258 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1262 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1264 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1266 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1268 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1269 bool write_fault
, bool *writable
)
1271 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1273 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1275 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1277 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1279 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1281 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1284 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1286 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1288 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1290 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1293 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1295 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1297 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1299 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1305 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1306 if (kvm_is_error_hva(addr
))
1309 if (entry
< nr_pages
)
1312 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1314 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1316 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1318 if (is_error_noslot_pfn(pfn
))
1319 return KVM_ERR_PTR_BAD_PAGE
;
1321 if (kvm_is_mmio_pfn(pfn
)) {
1323 return KVM_ERR_PTR_BAD_PAGE
;
1326 return pfn_to_page(pfn
);
1329 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1333 pfn
= gfn_to_pfn(kvm
, gfn
);
1335 return kvm_pfn_to_page(pfn
);
1338 EXPORT_SYMBOL_GPL(gfn_to_page
);
1340 void kvm_release_page_clean(struct page
*page
)
1342 WARN_ON(is_error_page(page
));
1344 kvm_release_pfn_clean(page_to_pfn(page
));
1346 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1348 void kvm_release_pfn_clean(pfn_t pfn
)
1350 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1351 put_page(pfn_to_page(pfn
));
1353 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1355 void kvm_release_page_dirty(struct page
*page
)
1357 WARN_ON(is_error_page(page
));
1359 kvm_release_pfn_dirty(page_to_pfn(page
));
1361 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1363 void kvm_release_pfn_dirty(pfn_t pfn
)
1365 kvm_set_pfn_dirty(pfn
);
1366 kvm_release_pfn_clean(pfn
);
1368 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty
);
1370 void kvm_set_page_dirty(struct page
*page
)
1372 kvm_set_pfn_dirty(page_to_pfn(page
));
1374 EXPORT_SYMBOL_GPL(kvm_set_page_dirty
);
1376 void kvm_set_pfn_dirty(pfn_t pfn
)
1378 if (!kvm_is_mmio_pfn(pfn
)) {
1379 struct page
*page
= pfn_to_page(pfn
);
1380 if (!PageReserved(page
))
1384 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1386 void kvm_set_pfn_accessed(pfn_t pfn
)
1388 if (!kvm_is_mmio_pfn(pfn
))
1389 mark_page_accessed(pfn_to_page(pfn
));
1391 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1393 void kvm_get_pfn(pfn_t pfn
)
1395 if (!kvm_is_mmio_pfn(pfn
))
1396 get_page(pfn_to_page(pfn
));
1398 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1400 static int next_segment(unsigned long len
, int offset
)
1402 if (len
> PAGE_SIZE
- offset
)
1403 return PAGE_SIZE
- offset
;
1408 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1414 addr
= gfn_to_hva_read(kvm
, gfn
);
1415 if (kvm_is_error_hva(addr
))
1417 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1422 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1424 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1426 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1428 int offset
= offset_in_page(gpa
);
1431 while ((seg
= next_segment(len
, offset
)) != 0) {
1432 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1442 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1444 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1449 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1450 int offset
= offset_in_page(gpa
);
1452 addr
= gfn_to_hva_read(kvm
, gfn
);
1453 if (kvm_is_error_hva(addr
))
1455 pagefault_disable();
1456 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1462 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1464 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1465 int offset
, int len
)
1470 addr
= gfn_to_hva(kvm
, gfn
);
1471 if (kvm_is_error_hva(addr
))
1473 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1476 mark_page_dirty(kvm
, gfn
);
1479 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1481 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1484 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1486 int offset
= offset_in_page(gpa
);
1489 while ((seg
= next_segment(len
, offset
)) != 0) {
1490 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1501 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1504 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1505 int offset
= offset_in_page(gpa
);
1506 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1509 ghc
->generation
= slots
->generation
;
1510 ghc
->memslot
= gfn_to_memslot(kvm
, gfn
);
1511 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, gfn
, NULL
);
1512 if (!kvm_is_error_hva(ghc
->hva
))
1519 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1521 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1522 void *data
, unsigned long len
)
1524 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1527 if (slots
->generation
!= ghc
->generation
)
1528 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1530 if (kvm_is_error_hva(ghc
->hva
))
1533 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1536 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1540 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1542 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1543 void *data
, unsigned long len
)
1545 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1548 if (slots
->generation
!= ghc
->generation
)
1549 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
);
1551 if (kvm_is_error_hva(ghc
->hva
))
1554 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1560 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1562 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1564 return kvm_write_guest_page(kvm
, gfn
, (const void *) empty_zero_page
,
1567 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1569 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1571 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1573 int offset
= offset_in_page(gpa
);
1576 while ((seg
= next_segment(len
, offset
)) != 0) {
1577 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1586 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1588 void mark_page_dirty_in_slot(struct kvm
*kvm
, struct kvm_memory_slot
*memslot
,
1591 if (memslot
&& memslot
->dirty_bitmap
) {
1592 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1594 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1598 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1600 struct kvm_memory_slot
*memslot
;
1602 memslot
= gfn_to_memslot(kvm
, gfn
);
1603 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1607 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1609 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1614 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1616 if (kvm_arch_vcpu_runnable(vcpu
)) {
1617 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1620 if (kvm_cpu_has_pending_timer(vcpu
))
1622 if (signal_pending(current
))
1628 finish_wait(&vcpu
->wq
, &wait
);
1633 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1635 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1638 int cpu
= vcpu
->cpu
;
1639 wait_queue_head_t
*wqp
;
1641 wqp
= kvm_arch_vcpu_wq(vcpu
);
1642 if (waitqueue_active(wqp
)) {
1643 wake_up_interruptible(wqp
);
1644 ++vcpu
->stat
.halt_wakeup
;
1648 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1649 if (kvm_arch_vcpu_should_kick(vcpu
))
1650 smp_send_reschedule(cpu
);
1653 #endif /* !CONFIG_S390 */
1655 void kvm_resched(struct kvm_vcpu
*vcpu
)
1657 if (!need_resched())
1661 EXPORT_SYMBOL_GPL(kvm_resched
);
1663 bool kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1666 struct task_struct
*task
= NULL
;
1669 pid
= rcu_dereference(target
->pid
);
1671 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1675 if (task
->flags
& PF_VCPU
) {
1676 put_task_struct(task
);
1679 if (yield_to(task
, 1)) {
1680 put_task_struct(task
);
1683 put_task_struct(task
);
1686 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1688 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1690 * Helper that checks whether a VCPU is eligible for directed yield.
1691 * Most eligible candidate to yield is decided by following heuristics:
1693 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1694 * (preempted lock holder), indicated by @in_spin_loop.
1695 * Set at the beiginning and cleared at the end of interception/PLE handler.
1697 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1698 * chance last time (mostly it has become eligible now since we have probably
1699 * yielded to lockholder in last iteration. This is done by toggling
1700 * @dy_eligible each time a VCPU checked for eligibility.)
1702 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1703 * to preempted lock-holder could result in wrong VCPU selection and CPU
1704 * burning. Giving priority for a potential lock-holder increases lock
1707 * Since algorithm is based on heuristics, accessing another VCPU data without
1708 * locking does not harm. It may result in trying to yield to same VCPU, fail
1709 * and continue with next VCPU and so on.
1711 bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1715 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1716 (vcpu
->spin_loop
.in_spin_loop
&&
1717 vcpu
->spin_loop
.dy_eligible
);
1719 if (vcpu
->spin_loop
.in_spin_loop
)
1720 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1725 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1727 struct kvm
*kvm
= me
->kvm
;
1728 struct kvm_vcpu
*vcpu
;
1729 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1734 kvm_vcpu_set_in_spin_loop(me
, true);
1736 * We boost the priority of a VCPU that is runnable but not
1737 * currently running, because it got preempted by something
1738 * else and called schedule in __vcpu_run. Hopefully that
1739 * VCPU is holding the lock that we need and will release it.
1740 * We approximate round-robin by starting at the last boosted VCPU.
1742 for (pass
= 0; pass
< 2 && !yielded
; pass
++) {
1743 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1744 if (!pass
&& i
<= last_boosted_vcpu
) {
1745 i
= last_boosted_vcpu
;
1747 } else if (pass
&& i
> last_boosted_vcpu
)
1751 if (waitqueue_active(&vcpu
->wq
))
1753 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1755 if (kvm_vcpu_yield_to(vcpu
)) {
1756 kvm
->last_boosted_vcpu
= i
;
1762 kvm_vcpu_set_in_spin_loop(me
, false);
1764 /* Ensure vcpu is not eligible during next spinloop */
1765 kvm_vcpu_set_dy_eligible(me
, false);
1767 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1769 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1771 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1774 if (vmf
->pgoff
== 0)
1775 page
= virt_to_page(vcpu
->run
);
1777 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1778 page
= virt_to_page(vcpu
->arch
.pio_data
);
1780 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1781 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1782 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1785 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1791 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1792 .fault
= kvm_vcpu_fault
,
1795 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1797 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1801 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1803 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1805 kvm_put_kvm(vcpu
->kvm
);
1809 static struct file_operations kvm_vcpu_fops
= {
1810 .release
= kvm_vcpu_release
,
1811 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1812 #ifdef CONFIG_COMPAT
1813 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1815 .mmap
= kvm_vcpu_mmap
,
1816 .llseek
= noop_llseek
,
1820 * Allocates an inode for the vcpu.
1822 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1824 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
);
1828 * Creates some virtual cpus. Good luck creating more than one.
1830 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1833 struct kvm_vcpu
*vcpu
, *v
;
1835 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1837 return PTR_ERR(vcpu
);
1839 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1841 r
= kvm_arch_vcpu_setup(vcpu
);
1845 mutex_lock(&kvm
->lock
);
1846 if (!kvm_vcpu_compatible(vcpu
)) {
1848 goto unlock_vcpu_destroy
;
1850 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1852 goto unlock_vcpu_destroy
;
1855 kvm_for_each_vcpu(r
, v
, kvm
)
1856 if (v
->vcpu_id
== id
) {
1858 goto unlock_vcpu_destroy
;
1861 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1863 /* Now it's all set up, let userspace reach it */
1865 r
= create_vcpu_fd(vcpu
);
1868 goto unlock_vcpu_destroy
;
1871 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1873 atomic_inc(&kvm
->online_vcpus
);
1875 mutex_unlock(&kvm
->lock
);
1876 kvm_arch_vcpu_postcreate(vcpu
);
1879 unlock_vcpu_destroy
:
1880 mutex_unlock(&kvm
->lock
);
1882 kvm_arch_vcpu_destroy(vcpu
);
1886 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1889 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1890 vcpu
->sigset_active
= 1;
1891 vcpu
->sigset
= *sigset
;
1893 vcpu
->sigset_active
= 0;
1897 static long kvm_vcpu_ioctl(struct file
*filp
,
1898 unsigned int ioctl
, unsigned long arg
)
1900 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1901 void __user
*argp
= (void __user
*)arg
;
1903 struct kvm_fpu
*fpu
= NULL
;
1904 struct kvm_sregs
*kvm_sregs
= NULL
;
1906 if (vcpu
->kvm
->mm
!= current
->mm
)
1909 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1911 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1912 * so vcpu_load() would break it.
1914 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1915 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1919 r
= vcpu_load(vcpu
);
1927 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1928 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1930 case KVM_GET_REGS
: {
1931 struct kvm_regs
*kvm_regs
;
1934 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
1937 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
1941 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
1948 case KVM_SET_REGS
: {
1949 struct kvm_regs
*kvm_regs
;
1952 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
1953 if (IS_ERR(kvm_regs
)) {
1954 r
= PTR_ERR(kvm_regs
);
1957 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
1961 case KVM_GET_SREGS
: {
1962 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
1966 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
1970 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
1975 case KVM_SET_SREGS
: {
1976 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
1977 if (IS_ERR(kvm_sregs
)) {
1978 r
= PTR_ERR(kvm_sregs
);
1982 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
1985 case KVM_GET_MP_STATE
: {
1986 struct kvm_mp_state mp_state
;
1988 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
1992 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
1997 case KVM_SET_MP_STATE
: {
1998 struct kvm_mp_state mp_state
;
2001 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2003 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2006 case KVM_TRANSLATE
: {
2007 struct kvm_translation tr
;
2010 if (copy_from_user(&tr
, argp
, sizeof tr
))
2012 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2016 if (copy_to_user(argp
, &tr
, sizeof tr
))
2021 case KVM_SET_GUEST_DEBUG
: {
2022 struct kvm_guest_debug dbg
;
2025 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2027 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2030 case KVM_SET_SIGNAL_MASK
: {
2031 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2032 struct kvm_signal_mask kvm_sigmask
;
2033 sigset_t sigset
, *p
;
2038 if (copy_from_user(&kvm_sigmask
, argp
,
2039 sizeof kvm_sigmask
))
2042 if (kvm_sigmask
.len
!= sizeof sigset
)
2045 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2050 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2054 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2058 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2062 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2068 fpu
= memdup_user(argp
, sizeof(*fpu
));
2074 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2078 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2087 #ifdef CONFIG_COMPAT
2088 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2089 unsigned int ioctl
, unsigned long arg
)
2091 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2092 void __user
*argp
= compat_ptr(arg
);
2095 if (vcpu
->kvm
->mm
!= current
->mm
)
2099 case KVM_SET_SIGNAL_MASK
: {
2100 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2101 struct kvm_signal_mask kvm_sigmask
;
2102 compat_sigset_t csigset
;
2107 if (copy_from_user(&kvm_sigmask
, argp
,
2108 sizeof kvm_sigmask
))
2111 if (kvm_sigmask
.len
!= sizeof csigset
)
2114 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2117 sigset_from_compat(&sigset
, &csigset
);
2118 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2120 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2124 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2132 static long kvm_vm_ioctl(struct file
*filp
,
2133 unsigned int ioctl
, unsigned long arg
)
2135 struct kvm
*kvm
= filp
->private_data
;
2136 void __user
*argp
= (void __user
*)arg
;
2139 if (kvm
->mm
!= current
->mm
)
2142 case KVM_CREATE_VCPU
:
2143 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2145 case KVM_SET_USER_MEMORY_REGION
: {
2146 struct kvm_userspace_memory_region kvm_userspace_mem
;
2149 if (copy_from_user(&kvm_userspace_mem
, argp
,
2150 sizeof kvm_userspace_mem
))
2153 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
, true);
2156 case KVM_GET_DIRTY_LOG
: {
2157 struct kvm_dirty_log log
;
2160 if (copy_from_user(&log
, argp
, sizeof log
))
2162 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2165 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2166 case KVM_REGISTER_COALESCED_MMIO
: {
2167 struct kvm_coalesced_mmio_zone zone
;
2169 if (copy_from_user(&zone
, argp
, sizeof zone
))
2171 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2174 case KVM_UNREGISTER_COALESCED_MMIO
: {
2175 struct kvm_coalesced_mmio_zone zone
;
2177 if (copy_from_user(&zone
, argp
, sizeof zone
))
2179 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2184 struct kvm_irqfd data
;
2187 if (copy_from_user(&data
, argp
, sizeof data
))
2189 r
= kvm_irqfd(kvm
, &data
);
2192 case KVM_IOEVENTFD
: {
2193 struct kvm_ioeventfd data
;
2196 if (copy_from_user(&data
, argp
, sizeof data
))
2198 r
= kvm_ioeventfd(kvm
, &data
);
2201 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2202 case KVM_SET_BOOT_CPU_ID
:
2204 mutex_lock(&kvm
->lock
);
2205 if (atomic_read(&kvm
->online_vcpus
) != 0)
2208 kvm
->bsp_vcpu_id
= arg
;
2209 mutex_unlock(&kvm
->lock
);
2212 #ifdef CONFIG_HAVE_KVM_MSI
2213 case KVM_SIGNAL_MSI
: {
2217 if (copy_from_user(&msi
, argp
, sizeof msi
))
2219 r
= kvm_send_userspace_msi(kvm
, &msi
);
2223 #ifdef __KVM_HAVE_IRQ_LINE
2224 case KVM_IRQ_LINE_STATUS
:
2225 case KVM_IRQ_LINE
: {
2226 struct kvm_irq_level irq_event
;
2229 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2232 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
);
2237 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2238 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2247 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2249 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2255 #ifdef CONFIG_COMPAT
2256 struct compat_kvm_dirty_log
{
2260 compat_uptr_t dirty_bitmap
; /* one bit per page */
2265 static long kvm_vm_compat_ioctl(struct file
*filp
,
2266 unsigned int ioctl
, unsigned long arg
)
2268 struct kvm
*kvm
= filp
->private_data
;
2271 if (kvm
->mm
!= current
->mm
)
2274 case KVM_GET_DIRTY_LOG
: {
2275 struct compat_kvm_dirty_log compat_log
;
2276 struct kvm_dirty_log log
;
2279 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2280 sizeof(compat_log
)))
2282 log
.slot
= compat_log
.slot
;
2283 log
.padding1
= compat_log
.padding1
;
2284 log
.padding2
= compat_log
.padding2
;
2285 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2287 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2291 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2299 static int kvm_vm_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2301 struct page
*page
[1];
2304 gfn_t gfn
= vmf
->pgoff
;
2305 struct kvm
*kvm
= vma
->vm_file
->private_data
;
2307 addr
= gfn_to_hva(kvm
, gfn
);
2308 if (kvm_is_error_hva(addr
))
2309 return VM_FAULT_SIGBUS
;
2311 npages
= get_user_pages(current
, current
->mm
, addr
, 1, 1, 0, page
,
2313 if (unlikely(npages
!= 1))
2314 return VM_FAULT_SIGBUS
;
2316 vmf
->page
= page
[0];
2320 static const struct vm_operations_struct kvm_vm_vm_ops
= {
2321 .fault
= kvm_vm_fault
,
2324 static int kvm_vm_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2326 vma
->vm_ops
= &kvm_vm_vm_ops
;
2330 static struct file_operations kvm_vm_fops
= {
2331 .release
= kvm_vm_release
,
2332 .unlocked_ioctl
= kvm_vm_ioctl
,
2333 #ifdef CONFIG_COMPAT
2334 .compat_ioctl
= kvm_vm_compat_ioctl
,
2336 .mmap
= kvm_vm_mmap
,
2337 .llseek
= noop_llseek
,
2340 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2345 kvm
= kvm_create_vm(type
);
2347 return PTR_ERR(kvm
);
2348 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2349 r
= kvm_coalesced_mmio_init(kvm
);
2355 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
2362 static long kvm_dev_ioctl_check_extension_generic(long arg
)
2365 case KVM_CAP_USER_MEMORY
:
2366 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2367 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2368 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2369 case KVM_CAP_SET_BOOT_CPU_ID
:
2371 case KVM_CAP_INTERNAL_ERROR_DATA
:
2372 #ifdef CONFIG_HAVE_KVM_MSI
2373 case KVM_CAP_SIGNAL_MSI
:
2376 #ifdef KVM_CAP_IRQ_ROUTING
2377 case KVM_CAP_IRQ_ROUTING
:
2378 return KVM_MAX_IRQ_ROUTES
;
2383 return kvm_dev_ioctl_check_extension(arg
);
2386 static long kvm_dev_ioctl(struct file
*filp
,
2387 unsigned int ioctl
, unsigned long arg
)
2392 case KVM_GET_API_VERSION
:
2396 r
= KVM_API_VERSION
;
2399 r
= kvm_dev_ioctl_create_vm(arg
);
2401 case KVM_CHECK_EXTENSION
:
2402 r
= kvm_dev_ioctl_check_extension_generic(arg
);
2404 case KVM_GET_VCPU_MMAP_SIZE
:
2408 r
= PAGE_SIZE
; /* struct kvm_run */
2410 r
+= PAGE_SIZE
; /* pio data page */
2412 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2413 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2416 case KVM_TRACE_ENABLE
:
2417 case KVM_TRACE_PAUSE
:
2418 case KVM_TRACE_DISABLE
:
2422 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2428 static struct file_operations kvm_chardev_ops
= {
2429 .unlocked_ioctl
= kvm_dev_ioctl
,
2430 .compat_ioctl
= kvm_dev_ioctl
,
2431 .llseek
= noop_llseek
,
2434 static struct miscdevice kvm_dev
= {
2440 static void hardware_enable_nolock(void *junk
)
2442 int cpu
= raw_smp_processor_id();
2445 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2448 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2450 r
= kvm_arch_hardware_enable(NULL
);
2453 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2454 atomic_inc(&hardware_enable_failed
);
2455 printk(KERN_INFO
"kvm: enabling virtualization on "
2456 "CPU%d failed\n", cpu
);
2460 static void hardware_enable(void *junk
)
2462 raw_spin_lock(&kvm_lock
);
2463 hardware_enable_nolock(junk
);
2464 raw_spin_unlock(&kvm_lock
);
2467 static void hardware_disable_nolock(void *junk
)
2469 int cpu
= raw_smp_processor_id();
2471 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2473 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2474 kvm_arch_hardware_disable(NULL
);
2477 static void hardware_disable(void *junk
)
2479 raw_spin_lock(&kvm_lock
);
2480 hardware_disable_nolock(junk
);
2481 raw_spin_unlock(&kvm_lock
);
2484 static void hardware_disable_all_nolock(void)
2486 BUG_ON(!kvm_usage_count
);
2489 if (!kvm_usage_count
)
2490 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2493 static void hardware_disable_all(void)
2495 raw_spin_lock(&kvm_lock
);
2496 hardware_disable_all_nolock();
2497 raw_spin_unlock(&kvm_lock
);
2500 static int hardware_enable_all(void)
2504 raw_spin_lock(&kvm_lock
);
2507 if (kvm_usage_count
== 1) {
2508 atomic_set(&hardware_enable_failed
, 0);
2509 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2511 if (atomic_read(&hardware_enable_failed
)) {
2512 hardware_disable_all_nolock();
2517 raw_spin_unlock(&kvm_lock
);
2522 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2527 if (!kvm_usage_count
)
2530 val
&= ~CPU_TASKS_FROZEN
;
2533 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2535 hardware_disable(NULL
);
2538 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2540 hardware_enable(NULL
);
2547 asmlinkage
void kvm_spurious_fault(void)
2549 /* Fault while not rebooting. We want the trace. */
2552 EXPORT_SYMBOL_GPL(kvm_spurious_fault
);
2554 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2558 * Some (well, at least mine) BIOSes hang on reboot if
2561 * And Intel TXT required VMX off for all cpu when system shutdown.
2563 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2564 kvm_rebooting
= true;
2565 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2569 static struct notifier_block kvm_reboot_notifier
= {
2570 .notifier_call
= kvm_reboot
,
2574 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2578 for (i
= 0; i
< bus
->dev_count
; i
++) {
2579 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2581 kvm_iodevice_destructor(pos
);
2586 int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2588 const struct kvm_io_range
*r1
= p1
;
2589 const struct kvm_io_range
*r2
= p2
;
2591 if (r1
->addr
< r2
->addr
)
2593 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2598 int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2599 gpa_t addr
, int len
)
2601 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2607 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2608 kvm_io_bus_sort_cmp
, NULL
);
2613 int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2614 gpa_t addr
, int len
)
2616 struct kvm_io_range
*range
, key
;
2619 key
= (struct kvm_io_range
) {
2624 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2625 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2629 off
= range
- bus
->range
;
2631 while (off
> 0 && kvm_io_bus_sort_cmp(&key
, &bus
->range
[off
-1]) == 0)
2637 /* kvm_io_bus_write - called under kvm->slots_lock */
2638 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2639 int len
, const void *val
)
2642 struct kvm_io_bus
*bus
;
2643 struct kvm_io_range range
;
2645 range
= (struct kvm_io_range
) {
2650 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2651 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2655 while (idx
< bus
->dev_count
&&
2656 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2657 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, addr
, len
, val
))
2665 /* kvm_io_bus_read - called under kvm->slots_lock */
2666 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2670 struct kvm_io_bus
*bus
;
2671 struct kvm_io_range range
;
2673 range
= (struct kvm_io_range
) {
2678 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2679 idx
= kvm_io_bus_get_first_dev(bus
, addr
, len
);
2683 while (idx
< bus
->dev_count
&&
2684 kvm_io_bus_sort_cmp(&range
, &bus
->range
[idx
]) == 0) {
2685 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, addr
, len
, val
))
2693 /* Caller must hold slots_lock. */
2694 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2695 int len
, struct kvm_io_device
*dev
)
2697 struct kvm_io_bus
*new_bus
, *bus
;
2699 bus
= kvm
->buses
[bus_idx
];
2700 if (bus
->dev_count
> NR_IOBUS_DEVS
- 1)
2703 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2704 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2707 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
2708 sizeof(struct kvm_io_range
)));
2709 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2710 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2711 synchronize_srcu_expedited(&kvm
->srcu
);
2717 /* Caller must hold slots_lock. */
2718 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2719 struct kvm_io_device
*dev
)
2722 struct kvm_io_bus
*new_bus
, *bus
;
2724 bus
= kvm
->buses
[bus_idx
];
2726 for (i
= 0; i
< bus
->dev_count
; i
++)
2727 if (bus
->range
[i
].dev
== dev
) {
2735 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
2736 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2740 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
2741 new_bus
->dev_count
--;
2742 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
2743 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
2745 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2746 synchronize_srcu_expedited(&kvm
->srcu
);
2751 static struct notifier_block kvm_cpu_notifier
= {
2752 .notifier_call
= kvm_cpu_hotplug
,
2755 static int vm_stat_get(void *_offset
, u64
*val
)
2757 unsigned offset
= (long)_offset
;
2761 raw_spin_lock(&kvm_lock
);
2762 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2763 *val
+= *(u32
*)((void *)kvm
+ offset
);
2764 raw_spin_unlock(&kvm_lock
);
2768 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
2770 static int vcpu_stat_get(void *_offset
, u64
*val
)
2772 unsigned offset
= (long)_offset
;
2774 struct kvm_vcpu
*vcpu
;
2778 raw_spin_lock(&kvm_lock
);
2779 list_for_each_entry(kvm
, &vm_list
, vm_list
)
2780 kvm_for_each_vcpu(i
, vcpu
, kvm
)
2781 *val
+= *(u32
*)((void *)vcpu
+ offset
);
2783 raw_spin_unlock(&kvm_lock
);
2787 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
2789 static const struct file_operations
*stat_fops
[] = {
2790 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
2791 [KVM_STAT_VM
] = &vm_stat_fops
,
2794 static int kvm_init_debug(void)
2797 struct kvm_stats_debugfs_item
*p
;
2799 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
2800 if (kvm_debugfs_dir
== NULL
)
2803 for (p
= debugfs_entries
; p
->name
; ++p
) {
2804 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
2805 (void *)(long)p
->offset
,
2806 stat_fops
[p
->kind
]);
2807 if (p
->dentry
== NULL
)
2814 debugfs_remove_recursive(kvm_debugfs_dir
);
2819 static void kvm_exit_debug(void)
2821 struct kvm_stats_debugfs_item
*p
;
2823 for (p
= debugfs_entries
; p
->name
; ++p
)
2824 debugfs_remove(p
->dentry
);
2825 debugfs_remove(kvm_debugfs_dir
);
2828 static int kvm_suspend(void)
2830 if (kvm_usage_count
)
2831 hardware_disable_nolock(NULL
);
2835 static void kvm_resume(void)
2837 if (kvm_usage_count
) {
2838 WARN_ON(raw_spin_is_locked(&kvm_lock
));
2839 hardware_enable_nolock(NULL
);
2843 static struct syscore_ops kvm_syscore_ops
= {
2844 .suspend
= kvm_suspend
,
2845 .resume
= kvm_resume
,
2849 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
2851 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
2854 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
2856 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2858 kvm_arch_vcpu_load(vcpu
, cpu
);
2861 static void kvm_sched_out(struct preempt_notifier
*pn
,
2862 struct task_struct
*next
)
2864 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
2866 kvm_arch_vcpu_put(vcpu
);
2869 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
2870 struct module
*module
)
2875 r
= kvm_arch_init(opaque
);
2879 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
2884 r
= kvm_arch_hardware_setup();
2888 for_each_online_cpu(cpu
) {
2889 smp_call_function_single(cpu
,
2890 kvm_arch_check_processor_compat
,
2896 r
= register_cpu_notifier(&kvm_cpu_notifier
);
2899 register_reboot_notifier(&kvm_reboot_notifier
);
2901 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2903 vcpu_align
= __alignof__(struct kvm_vcpu
);
2904 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
2906 if (!kvm_vcpu_cache
) {
2911 r
= kvm_async_pf_init();
2915 kvm_chardev_ops
.owner
= module
;
2916 kvm_vm_fops
.owner
= module
;
2917 kvm_vcpu_fops
.owner
= module
;
2919 r
= misc_register(&kvm_dev
);
2921 printk(KERN_ERR
"kvm: misc device register failed\n");
2925 register_syscore_ops(&kvm_syscore_ops
);
2927 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
2928 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
2930 r
= kvm_init_debug();
2932 printk(KERN_ERR
"kvm: create debugfs files failed\n");
2939 unregister_syscore_ops(&kvm_syscore_ops
);
2941 kvm_async_pf_deinit();
2943 kmem_cache_destroy(kvm_vcpu_cache
);
2945 unregister_reboot_notifier(&kvm_reboot_notifier
);
2946 unregister_cpu_notifier(&kvm_cpu_notifier
);
2949 kvm_arch_hardware_unsetup();
2951 free_cpumask_var(cpus_hardware_enabled
);
2957 EXPORT_SYMBOL_GPL(kvm_init
);
2962 misc_deregister(&kvm_dev
);
2963 kmem_cache_destroy(kvm_vcpu_cache
);
2964 kvm_async_pf_deinit();
2965 unregister_syscore_ops(&kvm_syscore_ops
);
2966 unregister_reboot_notifier(&kvm_reboot_notifier
);
2967 unregister_cpu_notifier(&kvm_cpu_notifier
);
2968 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2969 kvm_arch_hardware_unsetup();
2971 free_cpumask_var(cpus_hardware_enabled
);
2973 EXPORT_SYMBOL_GPL(kvm_exit
);