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 !is_zero_pfn(pfn
) && 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 bool kvm_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 (kvm_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 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
204 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
206 kvm_make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
209 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
211 kvm_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
);
300 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
302 srcu_read_unlock(&kvm
->srcu
, idx
);
305 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
306 struct mm_struct
*mm
,
307 unsigned long address
,
310 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
313 idx
= srcu_read_lock(&kvm
->srcu
);
314 spin_lock(&kvm
->mmu_lock
);
315 kvm
->mmu_notifier_seq
++;
316 kvm_set_spte_hva(kvm
, address
, pte
);
317 spin_unlock(&kvm
->mmu_lock
);
318 srcu_read_unlock(&kvm
->srcu
, idx
);
321 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
322 struct mm_struct
*mm
,
326 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
327 int need_tlb_flush
= 0, idx
;
329 idx
= srcu_read_lock(&kvm
->srcu
);
330 spin_lock(&kvm
->mmu_lock
);
332 * The count increase must become visible at unlock time as no
333 * spte can be established without taking the mmu_lock and
334 * count is also read inside the mmu_lock critical section.
336 kvm
->mmu_notifier_count
++;
337 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
338 need_tlb_flush
|= kvm
->tlbs_dirty
;
339 /* we've to flush the tlb before the pages can be freed */
341 kvm_flush_remote_tlbs(kvm
);
343 spin_unlock(&kvm
->mmu_lock
);
344 srcu_read_unlock(&kvm
->srcu
, idx
);
347 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
348 struct mm_struct
*mm
,
352 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
354 spin_lock(&kvm
->mmu_lock
);
356 * This sequence increase will notify the kvm page fault that
357 * the page that is going to be mapped in the spte could have
360 kvm
->mmu_notifier_seq
++;
363 * The above sequence increase must be visible before the
364 * below count decrease, which is ensured by the smp_wmb above
365 * in conjunction with the smp_rmb in mmu_notifier_retry().
367 kvm
->mmu_notifier_count
--;
368 spin_unlock(&kvm
->mmu_lock
);
370 BUG_ON(kvm
->mmu_notifier_count
< 0);
373 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
374 struct mm_struct
*mm
,
378 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
381 idx
= srcu_read_lock(&kvm
->srcu
);
382 spin_lock(&kvm
->mmu_lock
);
384 young
= kvm_age_hva(kvm
, start
, end
);
386 kvm_flush_remote_tlbs(kvm
);
388 spin_unlock(&kvm
->mmu_lock
);
389 srcu_read_unlock(&kvm
->srcu
, idx
);
394 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
395 struct mm_struct
*mm
,
396 unsigned long address
)
398 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
401 idx
= srcu_read_lock(&kvm
->srcu
);
402 spin_lock(&kvm
->mmu_lock
);
403 young
= kvm_test_age_hva(kvm
, address
);
404 spin_unlock(&kvm
->mmu_lock
);
405 srcu_read_unlock(&kvm
->srcu
, idx
);
410 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
411 struct mm_struct
*mm
)
413 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
416 idx
= srcu_read_lock(&kvm
->srcu
);
417 kvm_arch_flush_shadow_all(kvm
);
418 srcu_read_unlock(&kvm
->srcu
, idx
);
421 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
422 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
423 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
424 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
425 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
426 .test_young
= kvm_mmu_notifier_test_young
,
427 .change_pte
= kvm_mmu_notifier_change_pte
,
428 .release
= kvm_mmu_notifier_release
,
431 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
433 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
434 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
437 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
439 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
444 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
446 static void kvm_init_memslots_id(struct kvm
*kvm
)
449 struct kvm_memslots
*slots
= kvm
->memslots
;
451 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
452 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
455 static struct kvm
*kvm_create_vm(unsigned long type
)
458 struct kvm
*kvm
= kvm_arch_alloc_vm();
461 return ERR_PTR(-ENOMEM
);
463 r
= kvm_arch_init_vm(kvm
, type
);
465 goto out_err_no_disable
;
467 r
= hardware_enable_all();
469 goto out_err_no_disable
;
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
)
669 * Insert memslot and re-sort memslots based on their GFN,
670 * so binary search could be used to lookup GFN.
671 * Sorting algorithm takes advantage of having initially
672 * sorted array and known changed memslot position.
674 static void update_memslots(struct kvm_memslots
*slots
,
675 struct kvm_memory_slot
*new)
678 int i
= slots
->id_to_index
[id
];
679 struct kvm_memory_slot
*mslots
= slots
->memslots
;
681 WARN_ON(mslots
[i
].id
!= id
);
685 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
686 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
687 if (!mslots
[i
+ 1].npages
)
689 mslots
[i
] = mslots
[i
+ 1];
690 slots
->id_to_index
[mslots
[i
].id
] = i
;
694 new->base_gfn
> mslots
[i
- 1].base_gfn
) {
695 mslots
[i
] = mslots
[i
- 1];
696 slots
->id_to_index
[mslots
[i
].id
] = i
;
701 slots
->id_to_index
[mslots
[i
].id
] = i
;
704 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
706 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
708 #ifdef __KVM_HAVE_READONLY_MEM
709 valid_flags
|= KVM_MEM_READONLY
;
712 if (mem
->flags
& ~valid_flags
)
718 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
719 struct kvm_memslots
*slots
)
721 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
724 * Set the low bit in the generation, which disables SPTE caching
725 * until the end of synchronize_srcu_expedited.
727 WARN_ON(old_memslots
->generation
& 1);
728 slots
->generation
= old_memslots
->generation
+ 1;
730 rcu_assign_pointer(kvm
->memslots
, slots
);
731 synchronize_srcu_expedited(&kvm
->srcu
);
734 * Increment the new memslot generation a second time. This prevents
735 * vm exits that race with memslot updates from caching a memslot
736 * generation that will (potentially) be valid forever.
740 kvm_arch_memslots_updated(kvm
);
746 * Allocate some memory and give it an address in the guest physical address
749 * Discontiguous memory is allowed, mostly for framebuffers.
751 * Must be called holding kvm->slots_lock for write.
753 int __kvm_set_memory_region(struct kvm
*kvm
,
754 struct kvm_userspace_memory_region
*mem
)
758 unsigned long npages
;
759 struct kvm_memory_slot
*slot
;
760 struct kvm_memory_slot old
, new;
761 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
762 enum kvm_mr_change change
;
764 r
= check_memory_region_flags(mem
);
769 /* General sanity checks */
770 if (mem
->memory_size
& (PAGE_SIZE
- 1))
772 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
774 /* We can read the guest memory with __xxx_user() later on. */
775 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
776 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
777 !access_ok(VERIFY_WRITE
,
778 (void __user
*)(unsigned long)mem
->userspace_addr
,
781 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
783 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
786 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
787 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
788 npages
= mem
->memory_size
>> PAGE_SHIFT
;
790 if (npages
> KVM_MEM_MAX_NR_PAGES
)
794 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
799 new.base_gfn
= base_gfn
;
801 new.flags
= mem
->flags
;
805 change
= KVM_MR_CREATE
;
806 else { /* Modify an existing slot. */
807 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
808 (npages
!= old
.npages
) ||
809 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
812 if (base_gfn
!= old
.base_gfn
)
813 change
= KVM_MR_MOVE
;
814 else if (new.flags
!= old
.flags
)
815 change
= KVM_MR_FLAGS_ONLY
;
816 else { /* Nothing to change. */
821 } else if (old
.npages
) {
822 change
= KVM_MR_DELETE
;
823 } else /* Modify a non-existent slot: disallowed. */
826 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
827 /* Check for overlaps */
829 kvm_for_each_memslot(slot
, kvm
->memslots
) {
830 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
831 (slot
->id
== mem
->slot
))
833 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
834 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
839 /* Free page dirty bitmap if unneeded */
840 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
841 new.dirty_bitmap
= NULL
;
844 if (change
== KVM_MR_CREATE
) {
845 new.userspace_addr
= mem
->userspace_addr
;
847 if (kvm_arch_create_memslot(kvm
, &new, npages
))
851 /* Allocate page dirty bitmap if needed */
852 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
853 if (kvm_create_dirty_bitmap(&new) < 0)
857 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
862 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
863 slot
= id_to_memslot(slots
, mem
->slot
);
864 slot
->flags
|= KVM_MEMSLOT_INVALID
;
866 old_memslots
= install_new_memslots(kvm
, slots
);
868 /* slot was deleted or moved, clear iommu mapping */
869 kvm_iommu_unmap_pages(kvm
, &old
);
870 /* From this point no new shadow pages pointing to a deleted,
871 * or moved, memslot will be created.
873 * validation of sp->gfn happens in:
874 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
875 * - kvm_is_visible_gfn (mmu_check_roots)
877 kvm_arch_flush_shadow_memslot(kvm
, slot
);
880 * We can re-use the old_memslots from above, the only difference
881 * from the currently installed memslots is the invalid flag. This
882 * will get overwritten by update_memslots anyway.
884 slots
= old_memslots
;
887 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
891 /* actual memory is freed via old in kvm_free_physmem_slot below */
892 if (change
== KVM_MR_DELETE
) {
893 new.dirty_bitmap
= NULL
;
894 memset(&new.arch
, 0, sizeof(new.arch
));
897 update_memslots(slots
, &new);
898 old_memslots
= install_new_memslots(kvm
, slots
);
900 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
902 kvm_free_physmem_slot(kvm
, &old
, &new);
906 * IOMMU mapping: New slots need to be mapped. Old slots need to be
907 * un-mapped and re-mapped if their base changes. Since base change
908 * unmapping is handled above with slot deletion, mapping alone is
909 * needed here. Anything else the iommu might care about for existing
910 * slots (size changes, userspace addr changes and read-only flag
911 * changes) is disallowed above, so any other attribute changes getting
912 * here can be skipped.
914 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
915 r
= kvm_iommu_map_pages(kvm
, &new);
924 kvm_free_physmem_slot(kvm
, &new, &old
);
928 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
930 int kvm_set_memory_region(struct kvm
*kvm
,
931 struct kvm_userspace_memory_region
*mem
)
935 mutex_lock(&kvm
->slots_lock
);
936 r
= __kvm_set_memory_region(kvm
, mem
);
937 mutex_unlock(&kvm
->slots_lock
);
940 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
942 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
943 struct kvm_userspace_memory_region
*mem
)
945 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
947 return kvm_set_memory_region(kvm
, mem
);
950 int kvm_get_dirty_log(struct kvm
*kvm
,
951 struct kvm_dirty_log
*log
, int *is_dirty
)
953 struct kvm_memory_slot
*memslot
;
956 unsigned long any
= 0;
959 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
962 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
964 if (!memslot
->dirty_bitmap
)
967 n
= kvm_dirty_bitmap_bytes(memslot
);
969 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
970 any
= memslot
->dirty_bitmap
[i
];
973 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
983 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
985 bool kvm_largepages_enabled(void)
987 return largepages_enabled
;
990 void kvm_disable_largepages(void)
992 largepages_enabled
= false;
994 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
996 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
998 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1000 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1002 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1004 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1006 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1007 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1012 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1014 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1016 struct vm_area_struct
*vma
;
1017 unsigned long addr
, size
;
1021 addr
= gfn_to_hva(kvm
, gfn
);
1022 if (kvm_is_error_hva(addr
))
1025 down_read(¤t
->mm
->mmap_sem
);
1026 vma
= find_vma(current
->mm
, addr
);
1030 size
= vma_kernel_pagesize(vma
);
1033 up_read(¤t
->mm
->mmap_sem
);
1038 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1040 return slot
->flags
& KVM_MEM_READONLY
;
1043 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1044 gfn_t
*nr_pages
, bool write
)
1046 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1047 return KVM_HVA_ERR_BAD
;
1049 if (memslot_is_readonly(slot
) && write
)
1050 return KVM_HVA_ERR_RO_BAD
;
1053 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1055 return __gfn_to_hva_memslot(slot
, gfn
);
1058 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1061 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1064 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1067 return gfn_to_hva_many(slot
, gfn
, NULL
);
1069 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1071 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1073 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1075 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1078 * If writable is set to false, the hva returned by this function is only
1079 * allowed to be read.
1081 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1082 gfn_t gfn
, bool *writable
)
1084 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1086 if (!kvm_is_error_hva(hva
) && writable
)
1087 *writable
= !memslot_is_readonly(slot
);
1092 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1094 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1096 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1099 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1101 return __copy_from_user(data
, hva
, len
);
1104 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1106 return __copy_from_user_inatomic(data
, hva
, len
);
1109 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1110 unsigned long start
, int write
, struct page
**page
)
1112 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1115 flags
|= FOLL_WRITE
;
1117 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1120 int kvm_get_user_page_io(struct task_struct
*tsk
, struct mm_struct
*mm
,
1121 unsigned long addr
, bool write_fault
,
1122 struct page
**pagep
)
1126 int flags
= FOLL_TOUCH
| FOLL_HWPOISON
|
1127 (pagep
? FOLL_GET
: 0) |
1128 (write_fault
? FOLL_WRITE
: 0);
1131 * If retrying the fault, we get here *not* having allowed the filemap
1132 * to wait on the page lock. We should now allow waiting on the IO with
1133 * the mmap semaphore released.
1135 down_read(&mm
->mmap_sem
);
1136 npages
= __get_user_pages(tsk
, mm
, addr
, 1, flags
, pagep
, NULL
,
1145 * The previous call has now waited on the IO. Now we can
1146 * retry and complete. Pass TRIED to ensure we do not re
1147 * schedule async IO (see e.g. filemap_fault).
1149 down_read(&mm
->mmap_sem
);
1150 npages
= __get_user_pages(tsk
, mm
, addr
, 1, flags
| FOLL_TRIED
,
1153 up_read(&mm
->mmap_sem
);
1157 static inline int check_user_page_hwpoison(unsigned long addr
)
1159 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1161 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1162 flags
, NULL
, NULL
, NULL
);
1163 return rc
== -EHWPOISON
;
1167 * The atomic path to get the writable pfn which will be stored in @pfn,
1168 * true indicates success, otherwise false is returned.
1170 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1171 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1173 struct page
*page
[1];
1176 if (!(async
|| atomic
))
1180 * Fast pin a writable pfn only if it is a write fault request
1181 * or the caller allows to map a writable pfn for a read fault
1184 if (!(write_fault
|| writable
))
1187 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1189 *pfn
= page_to_pfn(page
[0]);
1200 * The slow path to get the pfn of the specified host virtual address,
1201 * 1 indicates success, -errno is returned if error is detected.
1203 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1204 bool *writable
, pfn_t
*pfn
)
1206 struct page
*page
[1];
1212 *writable
= write_fault
;
1215 down_read(¤t
->mm
->mmap_sem
);
1216 npages
= get_user_page_nowait(current
, current
->mm
,
1217 addr
, write_fault
, page
);
1218 up_read(¤t
->mm
->mmap_sem
);
1221 * By now we have tried gup_fast, and possibly async_pf, and we
1222 * are certainly not atomic. Time to retry the gup, allowing
1223 * mmap semaphore to be relinquished in the case of IO.
1225 npages
= kvm_get_user_page_io(current
, current
->mm
, addr
,
1231 /* map read fault as writable if possible */
1232 if (unlikely(!write_fault
) && writable
) {
1233 struct page
*wpage
[1];
1235 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1244 *pfn
= page_to_pfn(page
[0]);
1248 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1250 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1253 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1260 * Pin guest page in memory and return its pfn.
1261 * @addr: host virtual address which maps memory to the guest
1262 * @atomic: whether this function can sleep
1263 * @async: whether this function need to wait IO complete if the
1264 * host page is not in the memory
1265 * @write_fault: whether we should get a writable host page
1266 * @writable: whether it allows to map a writable host page for !@write_fault
1268 * The function will map a writable host page for these two cases:
1269 * 1): @write_fault = true
1270 * 2): @write_fault = false && @writable, @writable will tell the caller
1271 * whether the mapping is writable.
1273 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1274 bool write_fault
, bool *writable
)
1276 struct vm_area_struct
*vma
;
1280 /* we can do it either atomically or asynchronously, not both */
1281 BUG_ON(atomic
&& async
);
1283 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1287 return KVM_PFN_ERR_FAULT
;
1289 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1293 down_read(¤t
->mm
->mmap_sem
);
1294 if (npages
== -EHWPOISON
||
1295 (!async
&& check_user_page_hwpoison(addr
))) {
1296 pfn
= KVM_PFN_ERR_HWPOISON
;
1300 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1303 pfn
= KVM_PFN_ERR_FAULT
;
1304 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1305 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1307 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1309 if (async
&& vma_is_valid(vma
, write_fault
))
1311 pfn
= KVM_PFN_ERR_FAULT
;
1314 up_read(¤t
->mm
->mmap_sem
);
1319 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1320 bool *async
, bool write_fault
, bool *writable
)
1322 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1324 if (addr
== KVM_HVA_ERR_RO_BAD
)
1325 return KVM_PFN_ERR_RO_FAULT
;
1327 if (kvm_is_error_hva(addr
))
1328 return KVM_PFN_NOSLOT
;
1330 /* Do not map writable pfn in the readonly memslot. */
1331 if (writable
&& memslot_is_readonly(slot
)) {
1336 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1340 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1341 bool write_fault
, bool *writable
)
1343 struct kvm_memory_slot
*slot
;
1348 slot
= gfn_to_memslot(kvm
, gfn
);
1350 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1354 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1356 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1358 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1360 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1361 bool write_fault
, bool *writable
)
1363 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1365 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1367 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1369 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1371 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1373 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1376 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1378 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1380 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1382 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1385 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1387 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1389 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1391 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1397 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1398 if (kvm_is_error_hva(addr
))
1401 if (entry
< nr_pages
)
1404 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1406 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1408 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1410 if (is_error_noslot_pfn(pfn
))
1411 return KVM_ERR_PTR_BAD_PAGE
;
1413 if (kvm_is_mmio_pfn(pfn
)) {
1415 return KVM_ERR_PTR_BAD_PAGE
;
1418 return pfn_to_page(pfn
);
1421 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1425 pfn
= gfn_to_pfn(kvm
, gfn
);
1427 return kvm_pfn_to_page(pfn
);
1430 EXPORT_SYMBOL_GPL(gfn_to_page
);
1432 void kvm_release_page_clean(struct page
*page
)
1434 WARN_ON(is_error_page(page
));
1436 kvm_release_pfn_clean(page_to_pfn(page
));
1438 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1440 void kvm_release_pfn_clean(pfn_t pfn
)
1442 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1443 put_page(pfn_to_page(pfn
));
1445 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1447 void kvm_release_page_dirty(struct page
*page
)
1449 WARN_ON(is_error_page(page
));
1451 kvm_release_pfn_dirty(page_to_pfn(page
));
1453 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1455 static void kvm_release_pfn_dirty(pfn_t pfn
)
1457 kvm_set_pfn_dirty(pfn
);
1458 kvm_release_pfn_clean(pfn
);
1461 void kvm_set_pfn_dirty(pfn_t pfn
)
1463 if (!kvm_is_mmio_pfn(pfn
)) {
1464 struct page
*page
= pfn_to_page(pfn
);
1465 if (!PageReserved(page
))
1469 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1471 void kvm_set_pfn_accessed(pfn_t pfn
)
1473 if (!kvm_is_mmio_pfn(pfn
))
1474 mark_page_accessed(pfn_to_page(pfn
));
1476 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1478 void kvm_get_pfn(pfn_t pfn
)
1480 if (!kvm_is_mmio_pfn(pfn
))
1481 get_page(pfn_to_page(pfn
));
1483 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1485 static int next_segment(unsigned long len
, int offset
)
1487 if (len
> PAGE_SIZE
- offset
)
1488 return PAGE_SIZE
- offset
;
1493 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1499 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1500 if (kvm_is_error_hva(addr
))
1502 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1507 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1509 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1511 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1513 int offset
= offset_in_page(gpa
);
1516 while ((seg
= next_segment(len
, offset
)) != 0) {
1517 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1527 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1529 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1534 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1535 int offset
= offset_in_page(gpa
);
1537 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1538 if (kvm_is_error_hva(addr
))
1540 pagefault_disable();
1541 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1547 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1549 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1550 int offset
, int len
)
1555 addr
= gfn_to_hva(kvm
, gfn
);
1556 if (kvm_is_error_hva(addr
))
1558 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1561 mark_page_dirty(kvm
, gfn
);
1564 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1566 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1569 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1571 int offset
= offset_in_page(gpa
);
1574 while ((seg
= next_segment(len
, offset
)) != 0) {
1575 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1586 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1587 gpa_t gpa
, unsigned long len
)
1589 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1590 int offset
= offset_in_page(gpa
);
1591 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1592 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1593 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1594 gfn_t nr_pages_avail
;
1597 ghc
->generation
= slots
->generation
;
1599 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1600 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1601 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1605 * If the requested region crosses two memslots, we still
1606 * verify that the entire region is valid here.
1608 while (start_gfn
<= end_gfn
) {
1609 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1610 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1612 if (kvm_is_error_hva(ghc
->hva
))
1614 start_gfn
+= nr_pages_avail
;
1616 /* Use the slow path for cross page reads and writes. */
1617 ghc
->memslot
= NULL
;
1621 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1623 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1624 void *data
, unsigned long len
)
1626 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1629 BUG_ON(len
> ghc
->len
);
1631 if (slots
->generation
!= ghc
->generation
)
1632 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1634 if (unlikely(!ghc
->memslot
))
1635 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1637 if (kvm_is_error_hva(ghc
->hva
))
1640 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1643 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1647 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1649 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1650 void *data
, unsigned long len
)
1652 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1655 BUG_ON(len
> ghc
->len
);
1657 if (slots
->generation
!= ghc
->generation
)
1658 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1660 if (unlikely(!ghc
->memslot
))
1661 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1663 if (kvm_is_error_hva(ghc
->hva
))
1666 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1672 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1674 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1676 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1678 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1680 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1682 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1684 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1686 int offset
= offset_in_page(gpa
);
1689 while ((seg
= next_segment(len
, offset
)) != 0) {
1690 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1699 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1701 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
1702 struct kvm_memory_slot
*memslot
,
1705 if (memslot
&& memslot
->dirty_bitmap
) {
1706 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1708 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1712 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1714 struct kvm_memory_slot
*memslot
;
1716 memslot
= gfn_to_memslot(kvm
, gfn
);
1717 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1719 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1722 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1724 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1729 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1731 if (kvm_arch_vcpu_runnable(vcpu
)) {
1732 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1735 if (kvm_cpu_has_pending_timer(vcpu
))
1737 if (signal_pending(current
))
1743 finish_wait(&vcpu
->wq
, &wait
);
1745 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1749 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1751 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1754 int cpu
= vcpu
->cpu
;
1755 wait_queue_head_t
*wqp
;
1757 wqp
= kvm_arch_vcpu_wq(vcpu
);
1758 if (waitqueue_active(wqp
)) {
1759 wake_up_interruptible(wqp
);
1760 ++vcpu
->stat
.halt_wakeup
;
1764 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1765 if (kvm_arch_vcpu_should_kick(vcpu
))
1766 smp_send_reschedule(cpu
);
1769 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1770 #endif /* !CONFIG_S390 */
1772 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1775 struct task_struct
*task
= NULL
;
1779 pid
= rcu_dereference(target
->pid
);
1781 task
= get_pid_task(pid
, PIDTYPE_PID
);
1785 if (task
->flags
& PF_VCPU
) {
1786 put_task_struct(task
);
1789 ret
= yield_to(task
, 1);
1790 put_task_struct(task
);
1794 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1797 * Helper that checks whether a VCPU is eligible for directed yield.
1798 * Most eligible candidate to yield is decided by following heuristics:
1800 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1801 * (preempted lock holder), indicated by @in_spin_loop.
1802 * Set at the beiginning and cleared at the end of interception/PLE handler.
1804 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1805 * chance last time (mostly it has become eligible now since we have probably
1806 * yielded to lockholder in last iteration. This is done by toggling
1807 * @dy_eligible each time a VCPU checked for eligibility.)
1809 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1810 * to preempted lock-holder could result in wrong VCPU selection and CPU
1811 * burning. Giving priority for a potential lock-holder increases lock
1814 * Since algorithm is based on heuristics, accessing another VCPU data without
1815 * locking does not harm. It may result in trying to yield to same VCPU, fail
1816 * and continue with next VCPU and so on.
1818 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1820 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1823 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1824 vcpu
->spin_loop
.dy_eligible
;
1826 if (vcpu
->spin_loop
.in_spin_loop
)
1827 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1835 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1837 struct kvm
*kvm
= me
->kvm
;
1838 struct kvm_vcpu
*vcpu
;
1839 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1845 kvm_vcpu_set_in_spin_loop(me
, true);
1847 * We boost the priority of a VCPU that is runnable but not
1848 * currently running, because it got preempted by something
1849 * else and called schedule in __vcpu_run. Hopefully that
1850 * VCPU is holding the lock that we need and will release it.
1851 * We approximate round-robin by starting at the last boosted VCPU.
1853 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1854 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1855 if (!pass
&& i
<= last_boosted_vcpu
) {
1856 i
= last_boosted_vcpu
;
1858 } else if (pass
&& i
> last_boosted_vcpu
)
1860 if (!ACCESS_ONCE(vcpu
->preempted
))
1864 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
1866 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1869 yielded
= kvm_vcpu_yield_to(vcpu
);
1871 kvm
->last_boosted_vcpu
= i
;
1873 } else if (yielded
< 0) {
1880 kvm_vcpu_set_in_spin_loop(me
, false);
1882 /* Ensure vcpu is not eligible during next spinloop */
1883 kvm_vcpu_set_dy_eligible(me
, false);
1885 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1887 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1889 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1892 if (vmf
->pgoff
== 0)
1893 page
= virt_to_page(vcpu
->run
);
1895 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1896 page
= virt_to_page(vcpu
->arch
.pio_data
);
1898 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1899 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1900 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1903 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1909 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1910 .fault
= kvm_vcpu_fault
,
1913 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1915 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1919 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1921 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1923 kvm_put_kvm(vcpu
->kvm
);
1927 static struct file_operations kvm_vcpu_fops
= {
1928 .release
= kvm_vcpu_release
,
1929 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1930 #ifdef CONFIG_COMPAT
1931 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1933 .mmap
= kvm_vcpu_mmap
,
1934 .llseek
= noop_llseek
,
1938 * Allocates an inode for the vcpu.
1940 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1942 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
1946 * Creates some virtual cpus. Good luck creating more than one.
1948 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1951 struct kvm_vcpu
*vcpu
, *v
;
1953 if (id
>= KVM_MAX_VCPUS
)
1956 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1958 return PTR_ERR(vcpu
);
1960 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1962 r
= kvm_arch_vcpu_setup(vcpu
);
1966 mutex_lock(&kvm
->lock
);
1967 if (!kvm_vcpu_compatible(vcpu
)) {
1969 goto unlock_vcpu_destroy
;
1971 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1973 goto unlock_vcpu_destroy
;
1976 kvm_for_each_vcpu(r
, v
, kvm
)
1977 if (v
->vcpu_id
== id
) {
1979 goto unlock_vcpu_destroy
;
1982 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1984 /* Now it's all set up, let userspace reach it */
1986 r
= create_vcpu_fd(vcpu
);
1989 goto unlock_vcpu_destroy
;
1992 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1994 atomic_inc(&kvm
->online_vcpus
);
1996 mutex_unlock(&kvm
->lock
);
1997 kvm_arch_vcpu_postcreate(vcpu
);
2000 unlock_vcpu_destroy
:
2001 mutex_unlock(&kvm
->lock
);
2003 kvm_arch_vcpu_destroy(vcpu
);
2007 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2010 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2011 vcpu
->sigset_active
= 1;
2012 vcpu
->sigset
= *sigset
;
2014 vcpu
->sigset_active
= 0;
2018 static long kvm_vcpu_ioctl(struct file
*filp
,
2019 unsigned int ioctl
, unsigned long arg
)
2021 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2022 void __user
*argp
= (void __user
*)arg
;
2024 struct kvm_fpu
*fpu
= NULL
;
2025 struct kvm_sregs
*kvm_sregs
= NULL
;
2027 if (vcpu
->kvm
->mm
!= current
->mm
)
2030 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2033 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2035 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2036 * so vcpu_load() would break it.
2038 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
2039 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2043 r
= vcpu_load(vcpu
);
2051 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2052 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2054 case KVM_GET_REGS
: {
2055 struct kvm_regs
*kvm_regs
;
2058 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2061 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2065 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2072 case KVM_SET_REGS
: {
2073 struct kvm_regs
*kvm_regs
;
2076 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2077 if (IS_ERR(kvm_regs
)) {
2078 r
= PTR_ERR(kvm_regs
);
2081 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2085 case KVM_GET_SREGS
: {
2086 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2090 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2094 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2099 case KVM_SET_SREGS
: {
2100 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2101 if (IS_ERR(kvm_sregs
)) {
2102 r
= PTR_ERR(kvm_sregs
);
2106 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2109 case KVM_GET_MP_STATE
: {
2110 struct kvm_mp_state mp_state
;
2112 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2116 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2121 case KVM_SET_MP_STATE
: {
2122 struct kvm_mp_state mp_state
;
2125 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2127 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2130 case KVM_TRANSLATE
: {
2131 struct kvm_translation tr
;
2134 if (copy_from_user(&tr
, argp
, sizeof tr
))
2136 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2140 if (copy_to_user(argp
, &tr
, sizeof tr
))
2145 case KVM_SET_GUEST_DEBUG
: {
2146 struct kvm_guest_debug dbg
;
2149 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2151 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2154 case KVM_SET_SIGNAL_MASK
: {
2155 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2156 struct kvm_signal_mask kvm_sigmask
;
2157 sigset_t sigset
, *p
;
2162 if (copy_from_user(&kvm_sigmask
, argp
,
2163 sizeof kvm_sigmask
))
2166 if (kvm_sigmask
.len
!= sizeof sigset
)
2169 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2174 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2178 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2182 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2186 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2192 fpu
= memdup_user(argp
, sizeof(*fpu
));
2198 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2202 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2211 #ifdef CONFIG_COMPAT
2212 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2213 unsigned int ioctl
, unsigned long arg
)
2215 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2216 void __user
*argp
= compat_ptr(arg
);
2219 if (vcpu
->kvm
->mm
!= current
->mm
)
2223 case KVM_SET_SIGNAL_MASK
: {
2224 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2225 struct kvm_signal_mask kvm_sigmask
;
2226 compat_sigset_t csigset
;
2231 if (copy_from_user(&kvm_sigmask
, argp
,
2232 sizeof kvm_sigmask
))
2235 if (kvm_sigmask
.len
!= sizeof csigset
)
2238 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2241 sigset_from_compat(&sigset
, &csigset
);
2242 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2244 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2248 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2256 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2257 int (*accessor
)(struct kvm_device
*dev
,
2258 struct kvm_device_attr
*attr
),
2261 struct kvm_device_attr attr
;
2266 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2269 return accessor(dev
, &attr
);
2272 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2275 struct kvm_device
*dev
= filp
->private_data
;
2278 case KVM_SET_DEVICE_ATTR
:
2279 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2280 case KVM_GET_DEVICE_ATTR
:
2281 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2282 case KVM_HAS_DEVICE_ATTR
:
2283 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2285 if (dev
->ops
->ioctl
)
2286 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2292 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2294 struct kvm_device
*dev
= filp
->private_data
;
2295 struct kvm
*kvm
= dev
->kvm
;
2301 static const struct file_operations kvm_device_fops
= {
2302 .unlocked_ioctl
= kvm_device_ioctl
,
2303 #ifdef CONFIG_COMPAT
2304 .compat_ioctl
= kvm_device_ioctl
,
2306 .release
= kvm_device_release
,
2309 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2311 if (filp
->f_op
!= &kvm_device_fops
)
2314 return filp
->private_data
;
2317 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2318 #ifdef CONFIG_KVM_MPIC
2319 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2320 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2323 #ifdef CONFIG_KVM_XICS
2324 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2328 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2330 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2333 if (kvm_device_ops_table
[type
] != NULL
)
2336 kvm_device_ops_table
[type
] = ops
;
2340 void kvm_unregister_device_ops(u32 type
)
2342 if (kvm_device_ops_table
[type
] != NULL
)
2343 kvm_device_ops_table
[type
] = NULL
;
2346 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2347 struct kvm_create_device
*cd
)
2349 struct kvm_device_ops
*ops
= NULL
;
2350 struct kvm_device
*dev
;
2351 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2354 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2357 ops
= kvm_device_ops_table
[cd
->type
];
2364 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2371 ret
= ops
->create(dev
, cd
->type
);
2377 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2383 list_add(&dev
->vm_node
, &kvm
->devices
);
2389 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2392 case KVM_CAP_USER_MEMORY
:
2393 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2394 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2395 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2396 case KVM_CAP_SET_BOOT_CPU_ID
:
2398 case KVM_CAP_INTERNAL_ERROR_DATA
:
2399 #ifdef CONFIG_HAVE_KVM_MSI
2400 case KVM_CAP_SIGNAL_MSI
:
2402 #ifdef CONFIG_HAVE_KVM_IRQFD
2403 case KVM_CAP_IRQFD_RESAMPLE
:
2405 case KVM_CAP_CHECK_EXTENSION_VM
:
2407 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2408 case KVM_CAP_IRQ_ROUTING
:
2409 return KVM_MAX_IRQ_ROUTES
;
2414 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2417 static long kvm_vm_ioctl(struct file
*filp
,
2418 unsigned int ioctl
, unsigned long arg
)
2420 struct kvm
*kvm
= filp
->private_data
;
2421 void __user
*argp
= (void __user
*)arg
;
2424 if (kvm
->mm
!= current
->mm
)
2427 case KVM_CREATE_VCPU
:
2428 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2430 case KVM_SET_USER_MEMORY_REGION
: {
2431 struct kvm_userspace_memory_region kvm_userspace_mem
;
2434 if (copy_from_user(&kvm_userspace_mem
, argp
,
2435 sizeof kvm_userspace_mem
))
2438 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2441 case KVM_GET_DIRTY_LOG
: {
2442 struct kvm_dirty_log log
;
2445 if (copy_from_user(&log
, argp
, sizeof log
))
2447 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2450 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2451 case KVM_REGISTER_COALESCED_MMIO
: {
2452 struct kvm_coalesced_mmio_zone zone
;
2454 if (copy_from_user(&zone
, argp
, sizeof zone
))
2456 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2459 case KVM_UNREGISTER_COALESCED_MMIO
: {
2460 struct kvm_coalesced_mmio_zone zone
;
2462 if (copy_from_user(&zone
, argp
, sizeof zone
))
2464 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2469 struct kvm_irqfd data
;
2472 if (copy_from_user(&data
, argp
, sizeof data
))
2474 r
= kvm_irqfd(kvm
, &data
);
2477 case KVM_IOEVENTFD
: {
2478 struct kvm_ioeventfd data
;
2481 if (copy_from_user(&data
, argp
, sizeof data
))
2483 r
= kvm_ioeventfd(kvm
, &data
);
2486 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2487 case KVM_SET_BOOT_CPU_ID
:
2489 mutex_lock(&kvm
->lock
);
2490 if (atomic_read(&kvm
->online_vcpus
) != 0)
2493 kvm
->bsp_vcpu_id
= arg
;
2494 mutex_unlock(&kvm
->lock
);
2497 #ifdef CONFIG_HAVE_KVM_MSI
2498 case KVM_SIGNAL_MSI
: {
2502 if (copy_from_user(&msi
, argp
, sizeof msi
))
2504 r
= kvm_send_userspace_msi(kvm
, &msi
);
2508 #ifdef __KVM_HAVE_IRQ_LINE
2509 case KVM_IRQ_LINE_STATUS
:
2510 case KVM_IRQ_LINE
: {
2511 struct kvm_irq_level irq_event
;
2514 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2517 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2518 ioctl
== KVM_IRQ_LINE_STATUS
);
2523 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2524 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2532 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2533 case KVM_SET_GSI_ROUTING
: {
2534 struct kvm_irq_routing routing
;
2535 struct kvm_irq_routing __user
*urouting
;
2536 struct kvm_irq_routing_entry
*entries
;
2539 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2542 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2547 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2552 if (copy_from_user(entries
, urouting
->entries
,
2553 routing
.nr
* sizeof(*entries
)))
2554 goto out_free_irq_routing
;
2555 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2557 out_free_irq_routing
:
2561 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2562 case KVM_CREATE_DEVICE
: {
2563 struct kvm_create_device cd
;
2566 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2569 r
= kvm_ioctl_create_device(kvm
, &cd
);
2574 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2580 case KVM_CHECK_EXTENSION
:
2581 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2584 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2590 #ifdef CONFIG_COMPAT
2591 struct compat_kvm_dirty_log
{
2595 compat_uptr_t dirty_bitmap
; /* one bit per page */
2600 static long kvm_vm_compat_ioctl(struct file
*filp
,
2601 unsigned int ioctl
, unsigned long arg
)
2603 struct kvm
*kvm
= filp
->private_data
;
2606 if (kvm
->mm
!= current
->mm
)
2609 case KVM_GET_DIRTY_LOG
: {
2610 struct compat_kvm_dirty_log compat_log
;
2611 struct kvm_dirty_log log
;
2614 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2615 sizeof(compat_log
)))
2617 log
.slot
= compat_log
.slot
;
2618 log
.padding1
= compat_log
.padding1
;
2619 log
.padding2
= compat_log
.padding2
;
2620 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2622 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2626 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2634 static struct file_operations kvm_vm_fops
= {
2635 .release
= kvm_vm_release
,
2636 .unlocked_ioctl
= kvm_vm_ioctl
,
2637 #ifdef CONFIG_COMPAT
2638 .compat_ioctl
= kvm_vm_compat_ioctl
,
2640 .llseek
= noop_llseek
,
2643 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2648 kvm
= kvm_create_vm(type
);
2650 return PTR_ERR(kvm
);
2651 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2652 r
= kvm_coalesced_mmio_init(kvm
);
2658 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2665 static long kvm_dev_ioctl(struct file
*filp
,
2666 unsigned int ioctl
, unsigned long arg
)
2671 case KVM_GET_API_VERSION
:
2674 r
= KVM_API_VERSION
;
2677 r
= kvm_dev_ioctl_create_vm(arg
);
2679 case KVM_CHECK_EXTENSION
:
2680 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2682 case KVM_GET_VCPU_MMAP_SIZE
:
2685 r
= PAGE_SIZE
; /* struct kvm_run */
2687 r
+= PAGE_SIZE
; /* pio data page */
2689 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2690 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2693 case KVM_TRACE_ENABLE
:
2694 case KVM_TRACE_PAUSE
:
2695 case KVM_TRACE_DISABLE
:
2699 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2705 static struct file_operations kvm_chardev_ops
= {
2706 .unlocked_ioctl
= kvm_dev_ioctl
,
2707 .compat_ioctl
= kvm_dev_ioctl
,
2708 .llseek
= noop_llseek
,
2711 static struct miscdevice kvm_dev
= {
2717 static void hardware_enable_nolock(void *junk
)
2719 int cpu
= raw_smp_processor_id();
2722 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2725 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2727 r
= kvm_arch_hardware_enable();
2730 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2731 atomic_inc(&hardware_enable_failed
);
2732 printk(KERN_INFO
"kvm: enabling virtualization on "
2733 "CPU%d failed\n", cpu
);
2737 static void hardware_enable(void)
2739 raw_spin_lock(&kvm_count_lock
);
2740 if (kvm_usage_count
)
2741 hardware_enable_nolock(NULL
);
2742 raw_spin_unlock(&kvm_count_lock
);
2745 static void hardware_disable_nolock(void *junk
)
2747 int cpu
= raw_smp_processor_id();
2749 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2751 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2752 kvm_arch_hardware_disable();
2755 static void hardware_disable(void)
2757 raw_spin_lock(&kvm_count_lock
);
2758 if (kvm_usage_count
)
2759 hardware_disable_nolock(NULL
);
2760 raw_spin_unlock(&kvm_count_lock
);
2763 static void hardware_disable_all_nolock(void)
2765 BUG_ON(!kvm_usage_count
);
2768 if (!kvm_usage_count
)
2769 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2772 static void hardware_disable_all(void)
2774 raw_spin_lock(&kvm_count_lock
);
2775 hardware_disable_all_nolock();
2776 raw_spin_unlock(&kvm_count_lock
);
2779 static int hardware_enable_all(void)
2783 raw_spin_lock(&kvm_count_lock
);
2786 if (kvm_usage_count
== 1) {
2787 atomic_set(&hardware_enable_failed
, 0);
2788 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2790 if (atomic_read(&hardware_enable_failed
)) {
2791 hardware_disable_all_nolock();
2796 raw_spin_unlock(&kvm_count_lock
);
2801 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2806 val
&= ~CPU_TASKS_FROZEN
;
2809 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2814 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2822 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2826 * Some (well, at least mine) BIOSes hang on reboot if
2829 * And Intel TXT required VMX off for all cpu when system shutdown.
2831 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2832 kvm_rebooting
= true;
2833 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2837 static struct notifier_block kvm_reboot_notifier
= {
2838 .notifier_call
= kvm_reboot
,
2842 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2846 for (i
= 0; i
< bus
->dev_count
; i
++) {
2847 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2849 kvm_iodevice_destructor(pos
);
2854 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
2855 const struct kvm_io_range
*r2
)
2857 if (r1
->addr
< r2
->addr
)
2859 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2864 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2866 return kvm_io_bus_cmp(p1
, p2
);
2869 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2870 gpa_t addr
, int len
)
2872 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2878 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2879 kvm_io_bus_sort_cmp
, NULL
);
2884 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2885 gpa_t addr
, int len
)
2887 struct kvm_io_range
*range
, key
;
2890 key
= (struct kvm_io_range
) {
2895 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2896 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2900 off
= range
- bus
->range
;
2902 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
2908 static int __kvm_io_bus_write(struct kvm_io_bus
*bus
,
2909 struct kvm_io_range
*range
, const void *val
)
2913 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2917 while (idx
< bus
->dev_count
&&
2918 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2919 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, range
->addr
,
2928 /* kvm_io_bus_write - called under kvm->slots_lock */
2929 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2930 int len
, const void *val
)
2932 struct kvm_io_bus
*bus
;
2933 struct kvm_io_range range
;
2936 range
= (struct kvm_io_range
) {
2941 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2942 r
= __kvm_io_bus_write(bus
, &range
, val
);
2943 return r
< 0 ? r
: 0;
2946 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
2947 int kvm_io_bus_write_cookie(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2948 int len
, const void *val
, long cookie
)
2950 struct kvm_io_bus
*bus
;
2951 struct kvm_io_range range
;
2953 range
= (struct kvm_io_range
) {
2958 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2960 /* First try the device referenced by cookie. */
2961 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
2962 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
2963 if (!kvm_iodevice_write(bus
->range
[cookie
].dev
, addr
, len
,
2968 * cookie contained garbage; fall back to search and return the
2969 * correct cookie value.
2971 return __kvm_io_bus_write(bus
, &range
, val
);
2974 static int __kvm_io_bus_read(struct kvm_io_bus
*bus
, struct kvm_io_range
*range
,
2979 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2983 while (idx
< bus
->dev_count
&&
2984 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2985 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, range
->addr
,
2993 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
2995 /* kvm_io_bus_read - called under kvm->slots_lock */
2996 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2999 struct kvm_io_bus
*bus
;
3000 struct kvm_io_range range
;
3003 range
= (struct kvm_io_range
) {
3008 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3009 r
= __kvm_io_bus_read(bus
, &range
, val
);
3010 return r
< 0 ? r
: 0;
3014 /* Caller must hold slots_lock. */
3015 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3016 int len
, struct kvm_io_device
*dev
)
3018 struct kvm_io_bus
*new_bus
, *bus
;
3020 bus
= kvm
->buses
[bus_idx
];
3021 /* exclude ioeventfd which is limited by maximum fd */
3022 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3025 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3026 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3029 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3030 sizeof(struct kvm_io_range
)));
3031 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3032 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3033 synchronize_srcu_expedited(&kvm
->srcu
);
3039 /* Caller must hold slots_lock. */
3040 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3041 struct kvm_io_device
*dev
)
3044 struct kvm_io_bus
*new_bus
, *bus
;
3046 bus
= kvm
->buses
[bus_idx
];
3048 for (i
= 0; i
< bus
->dev_count
; i
++)
3049 if (bus
->range
[i
].dev
== dev
) {
3057 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3058 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3062 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3063 new_bus
->dev_count
--;
3064 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3065 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3067 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3068 synchronize_srcu_expedited(&kvm
->srcu
);
3073 static struct notifier_block kvm_cpu_notifier
= {
3074 .notifier_call
= kvm_cpu_hotplug
,
3077 static int vm_stat_get(void *_offset
, u64
*val
)
3079 unsigned offset
= (long)_offset
;
3083 spin_lock(&kvm_lock
);
3084 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3085 *val
+= *(u32
*)((void *)kvm
+ offset
);
3086 spin_unlock(&kvm_lock
);
3090 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3092 static int vcpu_stat_get(void *_offset
, u64
*val
)
3094 unsigned offset
= (long)_offset
;
3096 struct kvm_vcpu
*vcpu
;
3100 spin_lock(&kvm_lock
);
3101 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3102 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3103 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3105 spin_unlock(&kvm_lock
);
3109 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3111 static const struct file_operations
*stat_fops
[] = {
3112 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3113 [KVM_STAT_VM
] = &vm_stat_fops
,
3116 static int kvm_init_debug(void)
3119 struct kvm_stats_debugfs_item
*p
;
3121 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3122 if (kvm_debugfs_dir
== NULL
)
3125 for (p
= debugfs_entries
; p
->name
; ++p
) {
3126 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3127 (void *)(long)p
->offset
,
3128 stat_fops
[p
->kind
]);
3129 if (p
->dentry
== NULL
)
3136 debugfs_remove_recursive(kvm_debugfs_dir
);
3141 static void kvm_exit_debug(void)
3143 struct kvm_stats_debugfs_item
*p
;
3145 for (p
= debugfs_entries
; p
->name
; ++p
)
3146 debugfs_remove(p
->dentry
);
3147 debugfs_remove(kvm_debugfs_dir
);
3150 static int kvm_suspend(void)
3152 if (kvm_usage_count
)
3153 hardware_disable_nolock(NULL
);
3157 static void kvm_resume(void)
3159 if (kvm_usage_count
) {
3160 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3161 hardware_enable_nolock(NULL
);
3165 static struct syscore_ops kvm_syscore_ops
= {
3166 .suspend
= kvm_suspend
,
3167 .resume
= kvm_resume
,
3171 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3173 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3176 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3178 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3179 if (vcpu
->preempted
)
3180 vcpu
->preempted
= false;
3182 kvm_arch_sched_in(vcpu
, cpu
);
3184 kvm_arch_vcpu_load(vcpu
, cpu
);
3187 static void kvm_sched_out(struct preempt_notifier
*pn
,
3188 struct task_struct
*next
)
3190 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3192 if (current
->state
== TASK_RUNNING
)
3193 vcpu
->preempted
= true;
3194 kvm_arch_vcpu_put(vcpu
);
3197 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3198 struct module
*module
)
3203 r
= kvm_arch_init(opaque
);
3208 * kvm_arch_init makes sure there's at most one caller
3209 * for architectures that support multiple implementations,
3210 * like intel and amd on x86.
3211 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3212 * conflicts in case kvm is already setup for another implementation.
3214 r
= kvm_irqfd_init();
3218 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3223 r
= kvm_arch_hardware_setup();
3227 for_each_online_cpu(cpu
) {
3228 smp_call_function_single(cpu
,
3229 kvm_arch_check_processor_compat
,
3235 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3238 register_reboot_notifier(&kvm_reboot_notifier
);
3240 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3242 vcpu_align
= __alignof__(struct kvm_vcpu
);
3243 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3245 if (!kvm_vcpu_cache
) {
3250 r
= kvm_async_pf_init();
3254 kvm_chardev_ops
.owner
= module
;
3255 kvm_vm_fops
.owner
= module
;
3256 kvm_vcpu_fops
.owner
= module
;
3258 r
= misc_register(&kvm_dev
);
3260 printk(KERN_ERR
"kvm: misc device register failed\n");
3264 register_syscore_ops(&kvm_syscore_ops
);
3266 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3267 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3269 r
= kvm_init_debug();
3271 printk(KERN_ERR
"kvm: create debugfs files failed\n");
3275 r
= kvm_vfio_ops_init();
3281 unregister_syscore_ops(&kvm_syscore_ops
);
3282 misc_deregister(&kvm_dev
);
3284 kvm_async_pf_deinit();
3286 kmem_cache_destroy(kvm_vcpu_cache
);
3288 unregister_reboot_notifier(&kvm_reboot_notifier
);
3289 unregister_cpu_notifier(&kvm_cpu_notifier
);
3292 kvm_arch_hardware_unsetup();
3294 free_cpumask_var(cpus_hardware_enabled
);
3302 EXPORT_SYMBOL_GPL(kvm_init
);
3307 misc_deregister(&kvm_dev
);
3308 kmem_cache_destroy(kvm_vcpu_cache
);
3309 kvm_async_pf_deinit();
3310 unregister_syscore_ops(&kvm_syscore_ops
);
3311 unregister_reboot_notifier(&kvm_reboot_notifier
);
3312 unregister_cpu_notifier(&kvm_cpu_notifier
);
3313 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3314 kvm_arch_hardware_unsetup();
3317 free_cpumask_var(cpus_hardware_enabled
);
3318 kvm_vfio_ops_exit();
3320 EXPORT_SYMBOL_GPL(kvm_exit
);