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/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
72 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
75 DEFINE_SPINLOCK(kvm_lock
);
76 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
79 static cpumask_var_t cpus_hardware_enabled
;
80 static int kvm_usage_count
= 0;
81 static atomic_t hardware_enable_failed
;
83 struct kmem_cache
*kvm_vcpu_cache
;
84 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
86 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
88 struct dentry
*kvm_debugfs_dir
;
90 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
93 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
96 static int hardware_enable_all(void);
97 static void hardware_disable_all(void);
99 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
101 static void kvm_release_pfn_dirty(pfn_t pfn
);
102 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
103 struct kvm_memory_slot
*memslot
, gfn_t gfn
);
105 __visible
bool kvm_rebooting
;
106 EXPORT_SYMBOL_GPL(kvm_rebooting
);
108 static bool largepages_enabled
= true;
110 bool kvm_is_mmio_pfn(pfn_t pfn
)
113 return PageReserved(pfn_to_page(pfn
));
119 * Switches to specified vcpu, until a matching vcpu_put()
121 int vcpu_load(struct kvm_vcpu
*vcpu
)
125 if (mutex_lock_killable(&vcpu
->mutex
))
127 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
128 /* The thread running this VCPU changed. */
129 struct pid
*oldpid
= vcpu
->pid
;
130 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
131 rcu_assign_pointer(vcpu
->pid
, newpid
);
137 preempt_notifier_register(&vcpu
->preempt_notifier
);
138 kvm_arch_vcpu_load(vcpu
, cpu
);
143 void vcpu_put(struct kvm_vcpu
*vcpu
)
146 kvm_arch_vcpu_put(vcpu
);
147 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
149 mutex_unlock(&vcpu
->mutex
);
152 static void ack_flush(void *_completed
)
156 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
161 struct kvm_vcpu
*vcpu
;
163 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
166 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
167 kvm_make_request(req
, vcpu
);
170 /* Set ->requests bit before we read ->mode */
173 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
174 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
175 cpumask_set_cpu(cpu
, cpus
);
177 if (unlikely(cpus
== NULL
))
178 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
179 else if (!cpumask_empty(cpus
))
180 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
184 free_cpumask_var(cpus
);
188 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
190 long dirty_count
= kvm
->tlbs_dirty
;
193 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
194 ++kvm
->stat
.remote_tlb_flush
;
195 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
197 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
199 void kvm_reload_remote_mmus(struct kvm
*kvm
)
201 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
204 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
206 make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
209 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
211 make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
214 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
219 mutex_init(&vcpu
->mutex
);
224 init_waitqueue_head(&vcpu
->wq
);
225 kvm_async_pf_vcpu_init(vcpu
);
227 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
232 vcpu
->run
= page_address(page
);
234 kvm_vcpu_set_in_spin_loop(vcpu
, false);
235 kvm_vcpu_set_dy_eligible(vcpu
, false);
236 vcpu
->preempted
= false;
238 r
= kvm_arch_vcpu_init(vcpu
);
244 free_page((unsigned long)vcpu
->run
);
248 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
250 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
253 kvm_arch_vcpu_uninit(vcpu
);
254 free_page((unsigned long)vcpu
->run
);
256 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
258 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
259 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
261 return container_of(mn
, struct kvm
, mmu_notifier
);
264 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
265 struct mm_struct
*mm
,
266 unsigned long address
)
268 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
269 int need_tlb_flush
, idx
;
272 * When ->invalidate_page runs, the linux pte has been zapped
273 * already but the page is still allocated until
274 * ->invalidate_page returns. So if we increase the sequence
275 * here the kvm page fault will notice if the spte can't be
276 * established because the page is going to be freed. If
277 * instead the kvm page fault establishes the spte before
278 * ->invalidate_page runs, kvm_unmap_hva will release it
281 * The sequence increase only need to be seen at spin_unlock
282 * time, and not at spin_lock time.
284 * Increasing the sequence after the spin_unlock would be
285 * unsafe because the kvm page fault could then establish the
286 * pte after kvm_unmap_hva returned, without noticing the page
287 * is going to be freed.
289 idx
= srcu_read_lock(&kvm
->srcu
);
290 spin_lock(&kvm
->mmu_lock
);
292 kvm
->mmu_notifier_seq
++;
293 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
294 /* we've to flush the tlb before the pages can be freed */
296 kvm_flush_remote_tlbs(kvm
);
298 spin_unlock(&kvm
->mmu_lock
);
299 srcu_read_unlock(&kvm
->srcu
, idx
);
302 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
303 struct mm_struct
*mm
,
304 unsigned long address
,
307 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
310 idx
= srcu_read_lock(&kvm
->srcu
);
311 spin_lock(&kvm
->mmu_lock
);
312 kvm
->mmu_notifier_seq
++;
313 kvm_set_spte_hva(kvm
, address
, pte
);
314 spin_unlock(&kvm
->mmu_lock
);
315 srcu_read_unlock(&kvm
->srcu
, idx
);
318 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
319 struct mm_struct
*mm
,
323 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
324 int need_tlb_flush
= 0, idx
;
326 idx
= srcu_read_lock(&kvm
->srcu
);
327 spin_lock(&kvm
->mmu_lock
);
329 * The count increase must become visible at unlock time as no
330 * spte can be established without taking the mmu_lock and
331 * count is also read inside the mmu_lock critical section.
333 kvm
->mmu_notifier_count
++;
334 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
335 need_tlb_flush
|= kvm
->tlbs_dirty
;
336 /* we've to flush the tlb before the pages can be freed */
338 kvm_flush_remote_tlbs(kvm
);
340 spin_unlock(&kvm
->mmu_lock
);
341 srcu_read_unlock(&kvm
->srcu
, idx
);
344 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
345 struct mm_struct
*mm
,
349 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
351 spin_lock(&kvm
->mmu_lock
);
353 * This sequence increase will notify the kvm page fault that
354 * the page that is going to be mapped in the spte could have
357 kvm
->mmu_notifier_seq
++;
360 * The above sequence increase must be visible before the
361 * below count decrease, which is ensured by the smp_wmb above
362 * in conjunction with the smp_rmb in mmu_notifier_retry().
364 kvm
->mmu_notifier_count
--;
365 spin_unlock(&kvm
->mmu_lock
);
367 BUG_ON(kvm
->mmu_notifier_count
< 0);
370 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
371 struct mm_struct
*mm
,
375 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
378 idx
= srcu_read_lock(&kvm
->srcu
);
379 spin_lock(&kvm
->mmu_lock
);
381 young
= kvm_age_hva(kvm
, start
, end
);
383 kvm_flush_remote_tlbs(kvm
);
385 spin_unlock(&kvm
->mmu_lock
);
386 srcu_read_unlock(&kvm
->srcu
, idx
);
391 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
392 struct mm_struct
*mm
,
393 unsigned long address
)
395 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
398 idx
= srcu_read_lock(&kvm
->srcu
);
399 spin_lock(&kvm
->mmu_lock
);
400 young
= kvm_test_age_hva(kvm
, address
);
401 spin_unlock(&kvm
->mmu_lock
);
402 srcu_read_unlock(&kvm
->srcu
, idx
);
407 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
408 struct mm_struct
*mm
)
410 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
413 idx
= srcu_read_lock(&kvm
->srcu
);
414 kvm_arch_flush_shadow_all(kvm
);
415 srcu_read_unlock(&kvm
->srcu
, idx
);
418 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
419 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
420 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
421 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
422 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
423 .test_young
= kvm_mmu_notifier_test_young
,
424 .change_pte
= kvm_mmu_notifier_change_pte
,
425 .release
= kvm_mmu_notifier_release
,
428 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
430 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
431 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
434 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
436 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
441 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
443 static void kvm_init_memslots_id(struct kvm
*kvm
)
446 struct kvm_memslots
*slots
= kvm
->memslots
;
448 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
449 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
452 static struct kvm
*kvm_create_vm(unsigned long type
)
455 struct kvm
*kvm
= kvm_arch_alloc_vm();
458 return ERR_PTR(-ENOMEM
);
460 r
= kvm_arch_init_vm(kvm
, type
);
462 goto out_err_no_disable
;
464 r
= hardware_enable_all();
466 goto out_err_no_disable
;
468 #ifdef CONFIG_HAVE_KVM_IRQCHIP
469 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
471 #ifdef CONFIG_HAVE_KVM_IRQFD
472 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
475 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
478 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
480 goto out_err_no_srcu
;
483 * Init kvm generation close to the maximum to easily test the
484 * code of handling generation number wrap-around.
486 kvm
->memslots
->generation
= -150;
488 kvm_init_memslots_id(kvm
);
489 if (init_srcu_struct(&kvm
->srcu
))
490 goto out_err_no_srcu
;
491 if (init_srcu_struct(&kvm
->irq_srcu
))
492 goto out_err_no_irq_srcu
;
493 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
494 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
500 spin_lock_init(&kvm
->mmu_lock
);
501 kvm
->mm
= current
->mm
;
502 atomic_inc(&kvm
->mm
->mm_count
);
503 kvm_eventfd_init(kvm
);
504 mutex_init(&kvm
->lock
);
505 mutex_init(&kvm
->irq_lock
);
506 mutex_init(&kvm
->slots_lock
);
507 atomic_set(&kvm
->users_count
, 1);
508 INIT_LIST_HEAD(&kvm
->devices
);
510 r
= kvm_init_mmu_notifier(kvm
);
514 spin_lock(&kvm_lock
);
515 list_add(&kvm
->vm_list
, &vm_list
);
516 spin_unlock(&kvm_lock
);
521 cleanup_srcu_struct(&kvm
->irq_srcu
);
523 cleanup_srcu_struct(&kvm
->srcu
);
525 hardware_disable_all();
527 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
528 kfree(kvm
->buses
[i
]);
529 kfree(kvm
->memslots
);
530 kvm_arch_free_vm(kvm
);
535 * Avoid using vmalloc for a small buffer.
536 * Should not be used when the size is statically known.
538 void *kvm_kvzalloc(unsigned long size
)
540 if (size
> PAGE_SIZE
)
541 return vzalloc(size
);
543 return kzalloc(size
, GFP_KERNEL
);
546 void kvm_kvfree(const void *addr
)
548 if (is_vmalloc_addr(addr
))
554 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
556 if (!memslot
->dirty_bitmap
)
559 kvm_kvfree(memslot
->dirty_bitmap
);
560 memslot
->dirty_bitmap
= NULL
;
564 * Free any memory in @free but not in @dont.
566 static void kvm_free_physmem_slot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
567 struct kvm_memory_slot
*dont
)
569 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
570 kvm_destroy_dirty_bitmap(free
);
572 kvm_arch_free_memslot(kvm
, free
, dont
);
577 static void kvm_free_physmem(struct kvm
*kvm
)
579 struct kvm_memslots
*slots
= kvm
->memslots
;
580 struct kvm_memory_slot
*memslot
;
582 kvm_for_each_memslot(memslot
, slots
)
583 kvm_free_physmem_slot(kvm
, memslot
, NULL
);
585 kfree(kvm
->memslots
);
588 static void kvm_destroy_devices(struct kvm
*kvm
)
590 struct list_head
*node
, *tmp
;
592 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
593 struct kvm_device
*dev
=
594 list_entry(node
, struct kvm_device
, vm_node
);
597 dev
->ops
->destroy(dev
);
601 static void kvm_destroy_vm(struct kvm
*kvm
)
604 struct mm_struct
*mm
= kvm
->mm
;
606 kvm_arch_sync_events(kvm
);
607 spin_lock(&kvm_lock
);
608 list_del(&kvm
->vm_list
);
609 spin_unlock(&kvm_lock
);
610 kvm_free_irq_routing(kvm
);
611 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
612 kvm_io_bus_destroy(kvm
->buses
[i
]);
613 kvm_coalesced_mmio_free(kvm
);
614 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
615 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
617 kvm_arch_flush_shadow_all(kvm
);
619 kvm_arch_destroy_vm(kvm
);
620 kvm_destroy_devices(kvm
);
621 kvm_free_physmem(kvm
);
622 cleanup_srcu_struct(&kvm
->irq_srcu
);
623 cleanup_srcu_struct(&kvm
->srcu
);
624 kvm_arch_free_vm(kvm
);
625 hardware_disable_all();
629 void kvm_get_kvm(struct kvm
*kvm
)
631 atomic_inc(&kvm
->users_count
);
633 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
635 void kvm_put_kvm(struct kvm
*kvm
)
637 if (atomic_dec_and_test(&kvm
->users_count
))
640 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
643 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
645 struct kvm
*kvm
= filp
->private_data
;
647 kvm_irqfd_release(kvm
);
654 * Allocation size is twice as large as the actual dirty bitmap size.
655 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
657 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
659 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
661 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
662 if (!memslot
->dirty_bitmap
)
668 static int cmp_memslot(const void *slot1
, const void *slot2
)
670 struct kvm_memory_slot
*s1
, *s2
;
672 s1
= (struct kvm_memory_slot
*)slot1
;
673 s2
= (struct kvm_memory_slot
*)slot2
;
675 if (s1
->npages
< s2
->npages
)
677 if (s1
->npages
> s2
->npages
)
684 * Sort the memslots base on its size, so the larger slots
685 * will get better fit.
687 static void sort_memslots(struct kvm_memslots
*slots
)
691 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
692 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
694 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
695 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
698 static void update_memslots(struct kvm_memslots
*slots
,
699 struct kvm_memory_slot
*new)
703 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
704 unsigned long npages
= old
->npages
;
707 if (new->npages
!= npages
)
708 sort_memslots(slots
);
712 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
714 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
716 #ifdef __KVM_HAVE_READONLY_MEM
717 valid_flags
|= KVM_MEM_READONLY
;
720 if (mem
->flags
& ~valid_flags
)
726 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
727 struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
729 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
732 * Set the low bit in the generation, which disables SPTE caching
733 * until the end of synchronize_srcu_expedited.
735 WARN_ON(old_memslots
->generation
& 1);
736 slots
->generation
= old_memslots
->generation
+ 1;
738 update_memslots(slots
, new);
739 rcu_assign_pointer(kvm
->memslots
, slots
);
740 synchronize_srcu_expedited(&kvm
->srcu
);
743 * Increment the new memslot generation a second time. This prevents
744 * vm exits that race with memslot updates from caching a memslot
745 * generation that will (potentially) be valid forever.
749 kvm_arch_memslots_updated(kvm
);
755 * Allocate some memory and give it an address in the guest physical address
758 * Discontiguous memory is allowed, mostly for framebuffers.
760 * Must be called holding mmap_sem for write.
762 int __kvm_set_memory_region(struct kvm
*kvm
,
763 struct kvm_userspace_memory_region
*mem
)
767 unsigned long npages
;
768 struct kvm_memory_slot
*slot
;
769 struct kvm_memory_slot old
, new;
770 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
771 enum kvm_mr_change change
;
773 r
= check_memory_region_flags(mem
);
778 /* General sanity checks */
779 if (mem
->memory_size
& (PAGE_SIZE
- 1))
781 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
783 /* We can read the guest memory with __xxx_user() later on. */
784 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
785 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
786 !access_ok(VERIFY_WRITE
,
787 (void __user
*)(unsigned long)mem
->userspace_addr
,
790 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
792 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
795 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
796 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
797 npages
= mem
->memory_size
>> PAGE_SHIFT
;
799 if (npages
> KVM_MEM_MAX_NR_PAGES
)
803 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
808 new.base_gfn
= base_gfn
;
810 new.flags
= mem
->flags
;
814 change
= KVM_MR_CREATE
;
815 else { /* Modify an existing slot. */
816 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
817 (npages
!= old
.npages
) ||
818 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
821 if (base_gfn
!= old
.base_gfn
)
822 change
= KVM_MR_MOVE
;
823 else if (new.flags
!= old
.flags
)
824 change
= KVM_MR_FLAGS_ONLY
;
825 else { /* Nothing to change. */
830 } else if (old
.npages
) {
831 change
= KVM_MR_DELETE
;
832 } else /* Modify a non-existent slot: disallowed. */
835 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
836 /* Check for overlaps */
838 kvm_for_each_memslot(slot
, kvm
->memslots
) {
839 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
840 (slot
->id
== mem
->slot
))
842 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
843 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
848 /* Free page dirty bitmap if unneeded */
849 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
850 new.dirty_bitmap
= NULL
;
853 if (change
== KVM_MR_CREATE
) {
854 new.userspace_addr
= mem
->userspace_addr
;
856 if (kvm_arch_create_memslot(kvm
, &new, npages
))
860 /* Allocate page dirty bitmap if needed */
861 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
862 if (kvm_create_dirty_bitmap(&new) < 0)
866 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
867 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
871 slot
= id_to_memslot(slots
, mem
->slot
);
872 slot
->flags
|= KVM_MEMSLOT_INVALID
;
874 old_memslots
= install_new_memslots(kvm
, slots
, NULL
);
876 /* slot was deleted or moved, clear iommu mapping */
877 kvm_iommu_unmap_pages(kvm
, &old
);
878 /* From this point no new shadow pages pointing to a deleted,
879 * or moved, memslot will be created.
881 * validation of sp->gfn happens in:
882 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
883 * - kvm_is_visible_gfn (mmu_check_roots)
885 kvm_arch_flush_shadow_memslot(kvm
, slot
);
886 slots
= old_memslots
;
889 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
895 * We can re-use the old_memslots from above, the only difference
896 * from the currently installed memslots is the invalid flag. This
897 * will get overwritten by update_memslots anyway.
900 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
906 /* actual memory is freed via old in kvm_free_physmem_slot below */
907 if (change
== KVM_MR_DELETE
) {
908 new.dirty_bitmap
= NULL
;
909 memset(&new.arch
, 0, sizeof(new.arch
));
912 old_memslots
= install_new_memslots(kvm
, slots
, &new);
914 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
916 kvm_free_physmem_slot(kvm
, &old
, &new);
920 * IOMMU mapping: New slots need to be mapped. Old slots need to be
921 * un-mapped and re-mapped if their base changes. Since base change
922 * unmapping is handled above with slot deletion, mapping alone is
923 * needed here. Anything else the iommu might care about for existing
924 * slots (size changes, userspace addr changes and read-only flag
925 * changes) is disallowed above, so any other attribute changes getting
926 * here can be skipped.
928 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
929 r
= kvm_iommu_map_pages(kvm
, &new);
938 kvm_free_physmem_slot(kvm
, &new, &old
);
942 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
944 int kvm_set_memory_region(struct kvm
*kvm
,
945 struct kvm_userspace_memory_region
*mem
)
949 mutex_lock(&kvm
->slots_lock
);
950 r
= __kvm_set_memory_region(kvm
, mem
);
951 mutex_unlock(&kvm
->slots_lock
);
954 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
956 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
957 struct kvm_userspace_memory_region
*mem
)
959 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
961 return kvm_set_memory_region(kvm
, mem
);
964 int kvm_get_dirty_log(struct kvm
*kvm
,
965 struct kvm_dirty_log
*log
, int *is_dirty
)
967 struct kvm_memory_slot
*memslot
;
970 unsigned long any
= 0;
973 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
976 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
978 if (!memslot
->dirty_bitmap
)
981 n
= kvm_dirty_bitmap_bytes(memslot
);
983 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
984 any
= memslot
->dirty_bitmap
[i
];
987 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
997 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
999 bool kvm_largepages_enabled(void)
1001 return largepages_enabled
;
1004 void kvm_disable_largepages(void)
1006 largepages_enabled
= false;
1008 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1010 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1012 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1014 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1016 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1018 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1020 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1021 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1026 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1028 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1030 struct vm_area_struct
*vma
;
1031 unsigned long addr
, size
;
1035 addr
= gfn_to_hva(kvm
, gfn
);
1036 if (kvm_is_error_hva(addr
))
1039 down_read(¤t
->mm
->mmap_sem
);
1040 vma
= find_vma(current
->mm
, addr
);
1044 size
= vma_kernel_pagesize(vma
);
1047 up_read(¤t
->mm
->mmap_sem
);
1052 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1054 return slot
->flags
& KVM_MEM_READONLY
;
1057 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1058 gfn_t
*nr_pages
, bool write
)
1060 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1061 return KVM_HVA_ERR_BAD
;
1063 if (memslot_is_readonly(slot
) && write
)
1064 return KVM_HVA_ERR_RO_BAD
;
1067 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1069 return __gfn_to_hva_memslot(slot
, gfn
);
1072 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1075 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1078 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1081 return gfn_to_hva_many(slot
, gfn
, NULL
);
1083 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1085 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1087 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1089 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1092 * If writable is set to false, the hva returned by this function is only
1093 * allowed to be read.
1095 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1097 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1098 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1100 if (!kvm_is_error_hva(hva
) && writable
)
1101 *writable
= !memslot_is_readonly(slot
);
1106 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1108 return __copy_from_user(data
, hva
, len
);
1111 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1113 return __copy_from_user_inatomic(data
, hva
, len
);
1116 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1117 unsigned long start
, int write
, struct page
**page
)
1119 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1122 flags
|= FOLL_WRITE
;
1124 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1127 int kvm_get_user_page_io(struct task_struct
*tsk
, struct mm_struct
*mm
,
1128 unsigned long addr
, bool write_fault
,
1129 struct page
**pagep
)
1133 int flags
= FOLL_TOUCH
| FOLL_HWPOISON
|
1134 (pagep
? FOLL_GET
: 0) |
1135 (write_fault
? FOLL_WRITE
: 0);
1138 * If retrying the fault, we get here *not* having allowed the filemap
1139 * to wait on the page lock. We should now allow waiting on the IO with
1140 * the mmap semaphore released.
1142 down_read(&mm
->mmap_sem
);
1143 npages
= __get_user_pages(tsk
, mm
, addr
, 1, flags
, pagep
, NULL
,
1146 VM_BUG_ON(npages
!= -EBUSY
);
1152 * The previous call has now waited on the IO. Now we can
1153 * retry and complete. Pass TRIED to ensure we do not re
1154 * schedule async IO (see e.g. filemap_fault).
1156 down_read(&mm
->mmap_sem
);
1157 npages
= __get_user_pages(tsk
, mm
, addr
, 1, flags
| FOLL_TRIED
,
1160 up_read(&mm
->mmap_sem
);
1164 static inline int check_user_page_hwpoison(unsigned long addr
)
1166 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1168 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1169 flags
, NULL
, NULL
, NULL
);
1170 return rc
== -EHWPOISON
;
1174 * The atomic path to get the writable pfn which will be stored in @pfn,
1175 * true indicates success, otherwise false is returned.
1177 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1178 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1180 struct page
*page
[1];
1183 if (!(async
|| atomic
))
1187 * Fast pin a writable pfn only if it is a write fault request
1188 * or the caller allows to map a writable pfn for a read fault
1191 if (!(write_fault
|| writable
))
1194 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1196 *pfn
= page_to_pfn(page
[0]);
1207 * The slow path to get the pfn of the specified host virtual address,
1208 * 1 indicates success, -errno is returned if error is detected.
1210 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1211 bool *writable
, pfn_t
*pfn
)
1213 struct page
*page
[1];
1219 *writable
= write_fault
;
1222 down_read(¤t
->mm
->mmap_sem
);
1223 npages
= get_user_page_nowait(current
, current
->mm
,
1224 addr
, write_fault
, page
);
1225 up_read(¤t
->mm
->mmap_sem
);
1228 * By now we have tried gup_fast, and possibly async_pf, and we
1229 * are certainly not atomic. Time to retry the gup, allowing
1230 * mmap semaphore to be relinquished in the case of IO.
1232 npages
= kvm_get_user_page_io(current
, current
->mm
, addr
,
1238 /* map read fault as writable if possible */
1239 if (unlikely(!write_fault
) && writable
) {
1240 struct page
*wpage
[1];
1242 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1251 *pfn
= page_to_pfn(page
[0]);
1255 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1257 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1260 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1267 * Pin guest page in memory and return its pfn.
1268 * @addr: host virtual address which maps memory to the guest
1269 * @atomic: whether this function can sleep
1270 * @async: whether this function need to wait IO complete if the
1271 * host page is not in the memory
1272 * @write_fault: whether we should get a writable host page
1273 * @writable: whether it allows to map a writable host page for !@write_fault
1275 * The function will map a writable host page for these two cases:
1276 * 1): @write_fault = true
1277 * 2): @write_fault = false && @writable, @writable will tell the caller
1278 * whether the mapping is writable.
1280 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1281 bool write_fault
, bool *writable
)
1283 struct vm_area_struct
*vma
;
1287 /* we can do it either atomically or asynchronously, not both */
1288 BUG_ON(atomic
&& async
);
1290 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1294 return KVM_PFN_ERR_FAULT
;
1296 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1300 down_read(¤t
->mm
->mmap_sem
);
1301 if (npages
== -EHWPOISON
||
1302 (!async
&& check_user_page_hwpoison(addr
))) {
1303 pfn
= KVM_PFN_ERR_HWPOISON
;
1307 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1310 pfn
= KVM_PFN_ERR_FAULT
;
1311 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1312 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1314 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1316 if (async
&& vma_is_valid(vma
, write_fault
))
1318 pfn
= KVM_PFN_ERR_FAULT
;
1321 up_read(¤t
->mm
->mmap_sem
);
1326 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1327 bool *async
, bool write_fault
, bool *writable
)
1329 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1331 if (addr
== KVM_HVA_ERR_RO_BAD
)
1332 return KVM_PFN_ERR_RO_FAULT
;
1334 if (kvm_is_error_hva(addr
))
1335 return KVM_PFN_NOSLOT
;
1337 /* Do not map writable pfn in the readonly memslot. */
1338 if (writable
&& memslot_is_readonly(slot
)) {
1343 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1347 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1348 bool write_fault
, bool *writable
)
1350 struct kvm_memory_slot
*slot
;
1355 slot
= gfn_to_memslot(kvm
, gfn
);
1357 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1361 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1363 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1365 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1367 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1368 bool write_fault
, bool *writable
)
1370 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1372 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1374 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1376 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1378 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1380 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1383 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1385 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1387 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1389 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1392 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1394 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1396 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1398 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1404 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1405 if (kvm_is_error_hva(addr
))
1408 if (entry
< nr_pages
)
1411 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1413 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1415 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1417 if (is_error_noslot_pfn(pfn
))
1418 return KVM_ERR_PTR_BAD_PAGE
;
1420 if (kvm_is_mmio_pfn(pfn
)) {
1422 return KVM_ERR_PTR_BAD_PAGE
;
1425 return pfn_to_page(pfn
);
1428 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1432 pfn
= gfn_to_pfn(kvm
, gfn
);
1434 return kvm_pfn_to_page(pfn
);
1437 EXPORT_SYMBOL_GPL(gfn_to_page
);
1439 void kvm_release_page_clean(struct page
*page
)
1441 WARN_ON(is_error_page(page
));
1443 kvm_release_pfn_clean(page_to_pfn(page
));
1445 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1447 void kvm_release_pfn_clean(pfn_t pfn
)
1449 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1450 put_page(pfn_to_page(pfn
));
1452 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1454 void kvm_release_page_dirty(struct page
*page
)
1456 WARN_ON(is_error_page(page
));
1458 kvm_release_pfn_dirty(page_to_pfn(page
));
1460 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1462 static void kvm_release_pfn_dirty(pfn_t pfn
)
1464 kvm_set_pfn_dirty(pfn
);
1465 kvm_release_pfn_clean(pfn
);
1468 void kvm_set_pfn_dirty(pfn_t pfn
)
1470 if (!kvm_is_mmio_pfn(pfn
)) {
1471 struct page
*page
= pfn_to_page(pfn
);
1472 if (!PageReserved(page
))
1476 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1478 void kvm_set_pfn_accessed(pfn_t pfn
)
1480 if (!kvm_is_mmio_pfn(pfn
))
1481 mark_page_accessed(pfn_to_page(pfn
));
1483 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1485 void kvm_get_pfn(pfn_t pfn
)
1487 if (!kvm_is_mmio_pfn(pfn
))
1488 get_page(pfn_to_page(pfn
));
1490 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1492 static int next_segment(unsigned long len
, int offset
)
1494 if (len
> PAGE_SIZE
- offset
)
1495 return PAGE_SIZE
- offset
;
1500 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1506 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1507 if (kvm_is_error_hva(addr
))
1509 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1514 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1516 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1518 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1520 int offset
= offset_in_page(gpa
);
1523 while ((seg
= next_segment(len
, offset
)) != 0) {
1524 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1534 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1536 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1541 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1542 int offset
= offset_in_page(gpa
);
1544 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1545 if (kvm_is_error_hva(addr
))
1547 pagefault_disable();
1548 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1554 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1556 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1557 int offset
, int len
)
1562 addr
= gfn_to_hva(kvm
, gfn
);
1563 if (kvm_is_error_hva(addr
))
1565 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1568 mark_page_dirty(kvm
, gfn
);
1571 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1573 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1576 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1578 int offset
= offset_in_page(gpa
);
1581 while ((seg
= next_segment(len
, offset
)) != 0) {
1582 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1593 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1594 gpa_t gpa
, unsigned long len
)
1596 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1597 int offset
= offset_in_page(gpa
);
1598 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1599 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1600 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1601 gfn_t nr_pages_avail
;
1604 ghc
->generation
= slots
->generation
;
1606 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1607 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1608 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1612 * If the requested region crosses two memslots, we still
1613 * verify that the entire region is valid here.
1615 while (start_gfn
<= end_gfn
) {
1616 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1617 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1619 if (kvm_is_error_hva(ghc
->hva
))
1621 start_gfn
+= nr_pages_avail
;
1623 /* Use the slow path for cross page reads and writes. */
1624 ghc
->memslot
= NULL
;
1628 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1630 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1631 void *data
, unsigned long len
)
1633 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1636 BUG_ON(len
> ghc
->len
);
1638 if (slots
->generation
!= ghc
->generation
)
1639 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1641 if (unlikely(!ghc
->memslot
))
1642 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1644 if (kvm_is_error_hva(ghc
->hva
))
1647 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1650 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1654 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1656 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1657 void *data
, unsigned long len
)
1659 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1662 BUG_ON(len
> ghc
->len
);
1664 if (slots
->generation
!= ghc
->generation
)
1665 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1667 if (unlikely(!ghc
->memslot
))
1668 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1670 if (kvm_is_error_hva(ghc
->hva
))
1673 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1679 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1681 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1683 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1685 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1687 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1689 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1691 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1693 int offset
= offset_in_page(gpa
);
1696 while ((seg
= next_segment(len
, offset
)) != 0) {
1697 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1706 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1708 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
1709 struct kvm_memory_slot
*memslot
,
1712 if (memslot
&& memslot
->dirty_bitmap
) {
1713 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1715 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1719 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1721 struct kvm_memory_slot
*memslot
;
1723 memslot
= gfn_to_memslot(kvm
, gfn
);
1724 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1726 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1729 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1731 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1736 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1738 if (kvm_arch_vcpu_runnable(vcpu
)) {
1739 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1742 if (kvm_cpu_has_pending_timer(vcpu
))
1744 if (signal_pending(current
))
1750 finish_wait(&vcpu
->wq
, &wait
);
1752 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1756 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1758 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1761 int cpu
= vcpu
->cpu
;
1762 wait_queue_head_t
*wqp
;
1764 wqp
= kvm_arch_vcpu_wq(vcpu
);
1765 if (waitqueue_active(wqp
)) {
1766 wake_up_interruptible(wqp
);
1767 ++vcpu
->stat
.halt_wakeup
;
1771 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1772 if (kvm_arch_vcpu_should_kick(vcpu
))
1773 smp_send_reschedule(cpu
);
1776 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1777 #endif /* !CONFIG_S390 */
1779 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1782 struct task_struct
*task
= NULL
;
1786 pid
= rcu_dereference(target
->pid
);
1788 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1792 if (task
->flags
& PF_VCPU
) {
1793 put_task_struct(task
);
1796 ret
= yield_to(task
, 1);
1797 put_task_struct(task
);
1801 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1804 * Helper that checks whether a VCPU is eligible for directed yield.
1805 * Most eligible candidate to yield is decided by following heuristics:
1807 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1808 * (preempted lock holder), indicated by @in_spin_loop.
1809 * Set at the beiginning and cleared at the end of interception/PLE handler.
1811 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1812 * chance last time (mostly it has become eligible now since we have probably
1813 * yielded to lockholder in last iteration. This is done by toggling
1814 * @dy_eligible each time a VCPU checked for eligibility.)
1816 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1817 * to preempted lock-holder could result in wrong VCPU selection and CPU
1818 * burning. Giving priority for a potential lock-holder increases lock
1821 * Since algorithm is based on heuristics, accessing another VCPU data without
1822 * locking does not harm. It may result in trying to yield to same VCPU, fail
1823 * and continue with next VCPU and so on.
1825 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1827 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1830 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1831 vcpu
->spin_loop
.dy_eligible
;
1833 if (vcpu
->spin_loop
.in_spin_loop
)
1834 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1842 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1844 struct kvm
*kvm
= me
->kvm
;
1845 struct kvm_vcpu
*vcpu
;
1846 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1852 kvm_vcpu_set_in_spin_loop(me
, true);
1854 * We boost the priority of a VCPU that is runnable but not
1855 * currently running, because it got preempted by something
1856 * else and called schedule in __vcpu_run. Hopefully that
1857 * VCPU is holding the lock that we need and will release it.
1858 * We approximate round-robin by starting at the last boosted VCPU.
1860 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1861 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1862 if (!pass
&& i
<= last_boosted_vcpu
) {
1863 i
= last_boosted_vcpu
;
1865 } else if (pass
&& i
> last_boosted_vcpu
)
1867 if (!ACCESS_ONCE(vcpu
->preempted
))
1871 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
1873 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1876 yielded
= kvm_vcpu_yield_to(vcpu
);
1878 kvm
->last_boosted_vcpu
= i
;
1880 } else if (yielded
< 0) {
1887 kvm_vcpu_set_in_spin_loop(me
, false);
1889 /* Ensure vcpu is not eligible during next spinloop */
1890 kvm_vcpu_set_dy_eligible(me
, false);
1892 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1894 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1896 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1899 if (vmf
->pgoff
== 0)
1900 page
= virt_to_page(vcpu
->run
);
1902 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1903 page
= virt_to_page(vcpu
->arch
.pio_data
);
1905 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1906 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1907 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1910 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1916 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1917 .fault
= kvm_vcpu_fault
,
1920 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1922 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1926 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1928 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1930 kvm_put_kvm(vcpu
->kvm
);
1934 static struct file_operations kvm_vcpu_fops
= {
1935 .release
= kvm_vcpu_release
,
1936 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1937 #ifdef CONFIG_COMPAT
1938 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1940 .mmap
= kvm_vcpu_mmap
,
1941 .llseek
= noop_llseek
,
1945 * Allocates an inode for the vcpu.
1947 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1949 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
1953 * Creates some virtual cpus. Good luck creating more than one.
1955 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1958 struct kvm_vcpu
*vcpu
, *v
;
1960 if (id
>= KVM_MAX_VCPUS
)
1963 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1965 return PTR_ERR(vcpu
);
1967 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1969 r
= kvm_arch_vcpu_setup(vcpu
);
1973 mutex_lock(&kvm
->lock
);
1974 if (!kvm_vcpu_compatible(vcpu
)) {
1976 goto unlock_vcpu_destroy
;
1978 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1980 goto unlock_vcpu_destroy
;
1983 kvm_for_each_vcpu(r
, v
, kvm
)
1984 if (v
->vcpu_id
== id
) {
1986 goto unlock_vcpu_destroy
;
1989 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1991 /* Now it's all set up, let userspace reach it */
1993 r
= create_vcpu_fd(vcpu
);
1996 goto unlock_vcpu_destroy
;
1999 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2001 atomic_inc(&kvm
->online_vcpus
);
2003 mutex_unlock(&kvm
->lock
);
2004 kvm_arch_vcpu_postcreate(vcpu
);
2007 unlock_vcpu_destroy
:
2008 mutex_unlock(&kvm
->lock
);
2010 kvm_arch_vcpu_destroy(vcpu
);
2014 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2017 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2018 vcpu
->sigset_active
= 1;
2019 vcpu
->sigset
= *sigset
;
2021 vcpu
->sigset_active
= 0;
2025 static long kvm_vcpu_ioctl(struct file
*filp
,
2026 unsigned int ioctl
, unsigned long arg
)
2028 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2029 void __user
*argp
= (void __user
*)arg
;
2031 struct kvm_fpu
*fpu
= NULL
;
2032 struct kvm_sregs
*kvm_sregs
= NULL
;
2034 if (vcpu
->kvm
->mm
!= current
->mm
)
2037 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2040 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2042 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2043 * so vcpu_load() would break it.
2045 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
2046 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2050 r
= vcpu_load(vcpu
);
2058 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2059 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2061 case KVM_GET_REGS
: {
2062 struct kvm_regs
*kvm_regs
;
2065 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2068 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2072 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2079 case KVM_SET_REGS
: {
2080 struct kvm_regs
*kvm_regs
;
2083 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2084 if (IS_ERR(kvm_regs
)) {
2085 r
= PTR_ERR(kvm_regs
);
2088 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2092 case KVM_GET_SREGS
: {
2093 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2097 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2101 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2106 case KVM_SET_SREGS
: {
2107 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2108 if (IS_ERR(kvm_sregs
)) {
2109 r
= PTR_ERR(kvm_sregs
);
2113 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2116 case KVM_GET_MP_STATE
: {
2117 struct kvm_mp_state mp_state
;
2119 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2123 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2128 case KVM_SET_MP_STATE
: {
2129 struct kvm_mp_state mp_state
;
2132 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2134 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2137 case KVM_TRANSLATE
: {
2138 struct kvm_translation tr
;
2141 if (copy_from_user(&tr
, argp
, sizeof tr
))
2143 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2147 if (copy_to_user(argp
, &tr
, sizeof tr
))
2152 case KVM_SET_GUEST_DEBUG
: {
2153 struct kvm_guest_debug dbg
;
2156 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2158 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2161 case KVM_SET_SIGNAL_MASK
: {
2162 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2163 struct kvm_signal_mask kvm_sigmask
;
2164 sigset_t sigset
, *p
;
2169 if (copy_from_user(&kvm_sigmask
, argp
,
2170 sizeof kvm_sigmask
))
2173 if (kvm_sigmask
.len
!= sizeof sigset
)
2176 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2181 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2185 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2189 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2193 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2199 fpu
= memdup_user(argp
, sizeof(*fpu
));
2205 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2209 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2218 #ifdef CONFIG_COMPAT
2219 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2220 unsigned int ioctl
, unsigned long arg
)
2222 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2223 void __user
*argp
= compat_ptr(arg
);
2226 if (vcpu
->kvm
->mm
!= current
->mm
)
2230 case KVM_SET_SIGNAL_MASK
: {
2231 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2232 struct kvm_signal_mask kvm_sigmask
;
2233 compat_sigset_t csigset
;
2238 if (copy_from_user(&kvm_sigmask
, argp
,
2239 sizeof kvm_sigmask
))
2242 if (kvm_sigmask
.len
!= sizeof csigset
)
2245 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2248 sigset_from_compat(&sigset
, &csigset
);
2249 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2251 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2255 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2263 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2264 int (*accessor
)(struct kvm_device
*dev
,
2265 struct kvm_device_attr
*attr
),
2268 struct kvm_device_attr attr
;
2273 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2276 return accessor(dev
, &attr
);
2279 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2282 struct kvm_device
*dev
= filp
->private_data
;
2285 case KVM_SET_DEVICE_ATTR
:
2286 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2287 case KVM_GET_DEVICE_ATTR
:
2288 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2289 case KVM_HAS_DEVICE_ATTR
:
2290 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2292 if (dev
->ops
->ioctl
)
2293 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2299 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2301 struct kvm_device
*dev
= filp
->private_data
;
2302 struct kvm
*kvm
= dev
->kvm
;
2308 static const struct file_operations kvm_device_fops
= {
2309 .unlocked_ioctl
= kvm_device_ioctl
,
2310 #ifdef CONFIG_COMPAT
2311 .compat_ioctl
= kvm_device_ioctl
,
2313 .release
= kvm_device_release
,
2316 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2318 if (filp
->f_op
!= &kvm_device_fops
)
2321 return filp
->private_data
;
2324 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2325 #ifdef CONFIG_KVM_MPIC
2326 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2327 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2330 #ifdef CONFIG_KVM_XICS
2331 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2335 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2337 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2340 if (kvm_device_ops_table
[type
] != NULL
)
2343 kvm_device_ops_table
[type
] = ops
;
2347 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2348 struct kvm_create_device
*cd
)
2350 struct kvm_device_ops
*ops
= NULL
;
2351 struct kvm_device
*dev
;
2352 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2355 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2358 ops
= kvm_device_ops_table
[cd
->type
];
2365 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2372 ret
= ops
->create(dev
, cd
->type
);
2378 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2384 list_add(&dev
->vm_node
, &kvm
->devices
);
2390 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2393 case KVM_CAP_USER_MEMORY
:
2394 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2395 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2396 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2397 case KVM_CAP_SET_BOOT_CPU_ID
:
2399 case KVM_CAP_INTERNAL_ERROR_DATA
:
2400 #ifdef CONFIG_HAVE_KVM_MSI
2401 case KVM_CAP_SIGNAL_MSI
:
2403 #ifdef CONFIG_HAVE_KVM_IRQFD
2404 case KVM_CAP_IRQFD_RESAMPLE
:
2406 case KVM_CAP_CHECK_EXTENSION_VM
:
2408 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2409 case KVM_CAP_IRQ_ROUTING
:
2410 return KVM_MAX_IRQ_ROUTES
;
2415 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2418 static long kvm_vm_ioctl(struct file
*filp
,
2419 unsigned int ioctl
, unsigned long arg
)
2421 struct kvm
*kvm
= filp
->private_data
;
2422 void __user
*argp
= (void __user
*)arg
;
2425 if (kvm
->mm
!= current
->mm
)
2428 case KVM_CREATE_VCPU
:
2429 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2431 case KVM_SET_USER_MEMORY_REGION
: {
2432 struct kvm_userspace_memory_region kvm_userspace_mem
;
2435 if (copy_from_user(&kvm_userspace_mem
, argp
,
2436 sizeof kvm_userspace_mem
))
2439 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2442 case KVM_GET_DIRTY_LOG
: {
2443 struct kvm_dirty_log log
;
2446 if (copy_from_user(&log
, argp
, sizeof log
))
2448 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2451 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2452 case KVM_REGISTER_COALESCED_MMIO
: {
2453 struct kvm_coalesced_mmio_zone zone
;
2455 if (copy_from_user(&zone
, argp
, sizeof zone
))
2457 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2460 case KVM_UNREGISTER_COALESCED_MMIO
: {
2461 struct kvm_coalesced_mmio_zone zone
;
2463 if (copy_from_user(&zone
, argp
, sizeof zone
))
2465 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2470 struct kvm_irqfd data
;
2473 if (copy_from_user(&data
, argp
, sizeof data
))
2475 r
= kvm_irqfd(kvm
, &data
);
2478 case KVM_IOEVENTFD
: {
2479 struct kvm_ioeventfd data
;
2482 if (copy_from_user(&data
, argp
, sizeof data
))
2484 r
= kvm_ioeventfd(kvm
, &data
);
2487 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2488 case KVM_SET_BOOT_CPU_ID
:
2490 mutex_lock(&kvm
->lock
);
2491 if (atomic_read(&kvm
->online_vcpus
) != 0)
2494 kvm
->bsp_vcpu_id
= arg
;
2495 mutex_unlock(&kvm
->lock
);
2498 #ifdef CONFIG_HAVE_KVM_MSI
2499 case KVM_SIGNAL_MSI
: {
2503 if (copy_from_user(&msi
, argp
, sizeof msi
))
2505 r
= kvm_send_userspace_msi(kvm
, &msi
);
2509 #ifdef __KVM_HAVE_IRQ_LINE
2510 case KVM_IRQ_LINE_STATUS
:
2511 case KVM_IRQ_LINE
: {
2512 struct kvm_irq_level irq_event
;
2515 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2518 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2519 ioctl
== KVM_IRQ_LINE_STATUS
);
2524 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2525 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2533 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2534 case KVM_SET_GSI_ROUTING
: {
2535 struct kvm_irq_routing routing
;
2536 struct kvm_irq_routing __user
*urouting
;
2537 struct kvm_irq_routing_entry
*entries
;
2540 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2543 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2548 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2553 if (copy_from_user(entries
, urouting
->entries
,
2554 routing
.nr
* sizeof(*entries
)))
2555 goto out_free_irq_routing
;
2556 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2558 out_free_irq_routing
:
2562 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2563 case KVM_CREATE_DEVICE
: {
2564 struct kvm_create_device cd
;
2567 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2570 r
= kvm_ioctl_create_device(kvm
, &cd
);
2575 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2581 case KVM_CHECK_EXTENSION
:
2582 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2585 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2587 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2593 #ifdef CONFIG_COMPAT
2594 struct compat_kvm_dirty_log
{
2598 compat_uptr_t dirty_bitmap
; /* one bit per page */
2603 static long kvm_vm_compat_ioctl(struct file
*filp
,
2604 unsigned int ioctl
, unsigned long arg
)
2606 struct kvm
*kvm
= filp
->private_data
;
2609 if (kvm
->mm
!= current
->mm
)
2612 case KVM_GET_DIRTY_LOG
: {
2613 struct compat_kvm_dirty_log compat_log
;
2614 struct kvm_dirty_log log
;
2617 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2618 sizeof(compat_log
)))
2620 log
.slot
= compat_log
.slot
;
2621 log
.padding1
= compat_log
.padding1
;
2622 log
.padding2
= compat_log
.padding2
;
2623 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2625 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2629 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2637 static struct file_operations kvm_vm_fops
= {
2638 .release
= kvm_vm_release
,
2639 .unlocked_ioctl
= kvm_vm_ioctl
,
2640 #ifdef CONFIG_COMPAT
2641 .compat_ioctl
= kvm_vm_compat_ioctl
,
2643 .llseek
= noop_llseek
,
2646 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2651 kvm
= kvm_create_vm(type
);
2653 return PTR_ERR(kvm
);
2654 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2655 r
= kvm_coalesced_mmio_init(kvm
);
2661 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2668 static long kvm_dev_ioctl(struct file
*filp
,
2669 unsigned int ioctl
, unsigned long arg
)
2674 case KVM_GET_API_VERSION
:
2677 r
= KVM_API_VERSION
;
2680 r
= kvm_dev_ioctl_create_vm(arg
);
2682 case KVM_CHECK_EXTENSION
:
2683 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2685 case KVM_GET_VCPU_MMAP_SIZE
:
2688 r
= PAGE_SIZE
; /* struct kvm_run */
2690 r
+= PAGE_SIZE
; /* pio data page */
2692 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2693 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2696 case KVM_TRACE_ENABLE
:
2697 case KVM_TRACE_PAUSE
:
2698 case KVM_TRACE_DISABLE
:
2702 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2708 static struct file_operations kvm_chardev_ops
= {
2709 .unlocked_ioctl
= kvm_dev_ioctl
,
2710 .compat_ioctl
= kvm_dev_ioctl
,
2711 .llseek
= noop_llseek
,
2714 static struct miscdevice kvm_dev
= {
2720 static void hardware_enable_nolock(void *junk
)
2722 int cpu
= raw_smp_processor_id();
2725 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2728 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2730 r
= kvm_arch_hardware_enable();
2733 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2734 atomic_inc(&hardware_enable_failed
);
2735 printk(KERN_INFO
"kvm: enabling virtualization on "
2736 "CPU%d failed\n", cpu
);
2740 static void hardware_enable(void)
2742 raw_spin_lock(&kvm_count_lock
);
2743 if (kvm_usage_count
)
2744 hardware_enable_nolock(NULL
);
2745 raw_spin_unlock(&kvm_count_lock
);
2748 static void hardware_disable_nolock(void *junk
)
2750 int cpu
= raw_smp_processor_id();
2752 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2754 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2755 kvm_arch_hardware_disable();
2758 static void hardware_disable(void)
2760 raw_spin_lock(&kvm_count_lock
);
2761 if (kvm_usage_count
)
2762 hardware_disable_nolock(NULL
);
2763 raw_spin_unlock(&kvm_count_lock
);
2766 static void hardware_disable_all_nolock(void)
2768 BUG_ON(!kvm_usage_count
);
2771 if (!kvm_usage_count
)
2772 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2775 static void hardware_disable_all(void)
2777 raw_spin_lock(&kvm_count_lock
);
2778 hardware_disable_all_nolock();
2779 raw_spin_unlock(&kvm_count_lock
);
2782 static int hardware_enable_all(void)
2786 raw_spin_lock(&kvm_count_lock
);
2789 if (kvm_usage_count
== 1) {
2790 atomic_set(&hardware_enable_failed
, 0);
2791 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2793 if (atomic_read(&hardware_enable_failed
)) {
2794 hardware_disable_all_nolock();
2799 raw_spin_unlock(&kvm_count_lock
);
2804 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2809 val
&= ~CPU_TASKS_FROZEN
;
2812 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2817 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2825 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2829 * Some (well, at least mine) BIOSes hang on reboot if
2832 * And Intel TXT required VMX off for all cpu when system shutdown.
2834 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2835 kvm_rebooting
= true;
2836 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2840 static struct notifier_block kvm_reboot_notifier
= {
2841 .notifier_call
= kvm_reboot
,
2845 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2849 for (i
= 0; i
< bus
->dev_count
; i
++) {
2850 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2852 kvm_iodevice_destructor(pos
);
2857 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
2858 const struct kvm_io_range
*r2
)
2860 if (r1
->addr
< r2
->addr
)
2862 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2867 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2869 return kvm_io_bus_cmp(p1
, p2
);
2872 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2873 gpa_t addr
, int len
)
2875 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2881 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2882 kvm_io_bus_sort_cmp
, NULL
);
2887 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2888 gpa_t addr
, int len
)
2890 struct kvm_io_range
*range
, key
;
2893 key
= (struct kvm_io_range
) {
2898 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2899 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2903 off
= range
- bus
->range
;
2905 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
2911 static int __kvm_io_bus_write(struct kvm_io_bus
*bus
,
2912 struct kvm_io_range
*range
, const void *val
)
2916 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2920 while (idx
< bus
->dev_count
&&
2921 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2922 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, range
->addr
,
2931 /* kvm_io_bus_write - called under kvm->slots_lock */
2932 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2933 int len
, const void *val
)
2935 struct kvm_io_bus
*bus
;
2936 struct kvm_io_range range
;
2939 range
= (struct kvm_io_range
) {
2944 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2945 r
= __kvm_io_bus_write(bus
, &range
, val
);
2946 return r
< 0 ? r
: 0;
2949 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
2950 int kvm_io_bus_write_cookie(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2951 int len
, const void *val
, long cookie
)
2953 struct kvm_io_bus
*bus
;
2954 struct kvm_io_range range
;
2956 range
= (struct kvm_io_range
) {
2961 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2963 /* First try the device referenced by cookie. */
2964 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
2965 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
2966 if (!kvm_iodevice_write(bus
->range
[cookie
].dev
, addr
, len
,
2971 * cookie contained garbage; fall back to search and return the
2972 * correct cookie value.
2974 return __kvm_io_bus_write(bus
, &range
, val
);
2977 static int __kvm_io_bus_read(struct kvm_io_bus
*bus
, struct kvm_io_range
*range
,
2982 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2986 while (idx
< bus
->dev_count
&&
2987 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2988 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, range
->addr
,
2996 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
2998 /* kvm_io_bus_read - called under kvm->slots_lock */
2999 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3002 struct kvm_io_bus
*bus
;
3003 struct kvm_io_range range
;
3006 range
= (struct kvm_io_range
) {
3011 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3012 r
= __kvm_io_bus_read(bus
, &range
, val
);
3013 return r
< 0 ? r
: 0;
3017 /* Caller must hold slots_lock. */
3018 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3019 int len
, struct kvm_io_device
*dev
)
3021 struct kvm_io_bus
*new_bus
, *bus
;
3023 bus
= kvm
->buses
[bus_idx
];
3024 /* exclude ioeventfd which is limited by maximum fd */
3025 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3028 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3029 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3032 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3033 sizeof(struct kvm_io_range
)));
3034 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3035 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3036 synchronize_srcu_expedited(&kvm
->srcu
);
3042 /* Caller must hold slots_lock. */
3043 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3044 struct kvm_io_device
*dev
)
3047 struct kvm_io_bus
*new_bus
, *bus
;
3049 bus
= kvm
->buses
[bus_idx
];
3051 for (i
= 0; i
< bus
->dev_count
; i
++)
3052 if (bus
->range
[i
].dev
== dev
) {
3060 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3061 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3065 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3066 new_bus
->dev_count
--;
3067 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3068 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3070 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3071 synchronize_srcu_expedited(&kvm
->srcu
);
3076 static struct notifier_block kvm_cpu_notifier
= {
3077 .notifier_call
= kvm_cpu_hotplug
,
3080 static int vm_stat_get(void *_offset
, u64
*val
)
3082 unsigned offset
= (long)_offset
;
3086 spin_lock(&kvm_lock
);
3087 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3088 *val
+= *(u32
*)((void *)kvm
+ offset
);
3089 spin_unlock(&kvm_lock
);
3093 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3095 static int vcpu_stat_get(void *_offset
, u64
*val
)
3097 unsigned offset
= (long)_offset
;
3099 struct kvm_vcpu
*vcpu
;
3103 spin_lock(&kvm_lock
);
3104 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3105 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3106 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3108 spin_unlock(&kvm_lock
);
3112 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3114 static const struct file_operations
*stat_fops
[] = {
3115 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3116 [KVM_STAT_VM
] = &vm_stat_fops
,
3119 static int kvm_init_debug(void)
3122 struct kvm_stats_debugfs_item
*p
;
3124 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3125 if (kvm_debugfs_dir
== NULL
)
3128 for (p
= debugfs_entries
; p
->name
; ++p
) {
3129 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3130 (void *)(long)p
->offset
,
3131 stat_fops
[p
->kind
]);
3132 if (p
->dentry
== NULL
)
3139 debugfs_remove_recursive(kvm_debugfs_dir
);
3144 static void kvm_exit_debug(void)
3146 struct kvm_stats_debugfs_item
*p
;
3148 for (p
= debugfs_entries
; p
->name
; ++p
)
3149 debugfs_remove(p
->dentry
);
3150 debugfs_remove(kvm_debugfs_dir
);
3153 static int kvm_suspend(void)
3155 if (kvm_usage_count
)
3156 hardware_disable_nolock(NULL
);
3160 static void kvm_resume(void)
3162 if (kvm_usage_count
) {
3163 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3164 hardware_enable_nolock(NULL
);
3168 static struct syscore_ops kvm_syscore_ops
= {
3169 .suspend
= kvm_suspend
,
3170 .resume
= kvm_resume
,
3174 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3176 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3179 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3181 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3182 if (vcpu
->preempted
)
3183 vcpu
->preempted
= false;
3185 kvm_arch_sched_in(vcpu
, cpu
);
3187 kvm_arch_vcpu_load(vcpu
, cpu
);
3190 static void kvm_sched_out(struct preempt_notifier
*pn
,
3191 struct task_struct
*next
)
3193 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3195 if (current
->state
== TASK_RUNNING
)
3196 vcpu
->preempted
= true;
3197 kvm_arch_vcpu_put(vcpu
);
3200 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3201 struct module
*module
)
3206 r
= kvm_arch_init(opaque
);
3211 * kvm_arch_init makes sure there's at most one caller
3212 * for architectures that support multiple implementations,
3213 * like intel and amd on x86.
3214 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3215 * conflicts in case kvm is already setup for another implementation.
3217 r
= kvm_irqfd_init();
3221 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3226 r
= kvm_arch_hardware_setup();
3230 for_each_online_cpu(cpu
) {
3231 smp_call_function_single(cpu
,
3232 kvm_arch_check_processor_compat
,
3238 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3241 register_reboot_notifier(&kvm_reboot_notifier
);
3243 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3245 vcpu_align
= __alignof__(struct kvm_vcpu
);
3246 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3248 if (!kvm_vcpu_cache
) {
3253 r
= kvm_async_pf_init();
3257 kvm_chardev_ops
.owner
= module
;
3258 kvm_vm_fops
.owner
= module
;
3259 kvm_vcpu_fops
.owner
= module
;
3261 r
= misc_register(&kvm_dev
);
3263 printk(KERN_ERR
"kvm: misc device register failed\n");
3267 register_syscore_ops(&kvm_syscore_ops
);
3269 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3270 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3272 r
= kvm_init_debug();
3274 printk(KERN_ERR
"kvm: create debugfs files failed\n");
3278 r
= kvm_vfio_ops_init();
3284 unregister_syscore_ops(&kvm_syscore_ops
);
3285 misc_deregister(&kvm_dev
);
3287 kvm_async_pf_deinit();
3289 kmem_cache_destroy(kvm_vcpu_cache
);
3291 unregister_reboot_notifier(&kvm_reboot_notifier
);
3292 unregister_cpu_notifier(&kvm_cpu_notifier
);
3295 kvm_arch_hardware_unsetup();
3297 free_cpumask_var(cpus_hardware_enabled
);
3305 EXPORT_SYMBOL_GPL(kvm_init
);
3310 misc_deregister(&kvm_dev
);
3311 kmem_cache_destroy(kvm_vcpu_cache
);
3312 kvm_async_pf_deinit();
3313 unregister_syscore_ops(&kvm_syscore_ops
);
3314 unregister_reboot_notifier(&kvm_reboot_notifier
);
3315 unregister_cpu_notifier(&kvm_cpu_notifier
);
3316 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3317 kvm_arch_hardware_unsetup();
3320 free_cpumask_var(cpus_hardware_enabled
);
3322 EXPORT_SYMBOL_GPL(kvm_exit
);