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.
19 #include <kvm/iodev.h>
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 /* Worst case buffer size needed for holding an integer. */
67 #define ITOA_MAX_LEN 12
69 MODULE_AUTHOR("Qumranet");
70 MODULE_LICENSE("GPL");
72 /* Architectures should define their poll value according to the halt latency */
73 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
74 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
75 EXPORT_SYMBOL_GPL(halt_poll_ns
);
77 /* Default doubles per-vcpu halt_poll_ns. */
78 unsigned int halt_poll_ns_grow
= 2;
79 module_param(halt_poll_ns_grow
, uint
, S_IRUGO
| S_IWUSR
);
80 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
82 /* Default resets per-vcpu halt_poll_ns . */
83 unsigned int halt_poll_ns_shrink
;
84 module_param(halt_poll_ns_shrink
, uint
, S_IRUGO
| S_IWUSR
);
85 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
90 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
93 DEFINE_SPINLOCK(kvm_lock
);
94 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
97 static cpumask_var_t cpus_hardware_enabled
;
98 static int kvm_usage_count
;
99 static atomic_t hardware_enable_failed
;
101 struct kmem_cache
*kvm_vcpu_cache
;
102 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
104 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
106 struct dentry
*kvm_debugfs_dir
;
107 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
109 static int kvm_debugfs_num_entries
;
110 static const struct file_operations
*stat_fops_per_vm
[];
112 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
114 #ifdef CONFIG_KVM_COMPAT
115 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
118 static int hardware_enable_all(void);
119 static void hardware_disable_all(void);
121 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
123 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
);
124 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
126 __visible
bool kvm_rebooting
;
127 EXPORT_SYMBOL_GPL(kvm_rebooting
);
129 static bool largepages_enabled
= true;
131 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
134 return PageReserved(pfn_to_page(pfn
));
140 * Switches to specified vcpu, until a matching vcpu_put()
142 int vcpu_load(struct kvm_vcpu
*vcpu
)
146 if (mutex_lock_killable(&vcpu
->mutex
))
149 preempt_notifier_register(&vcpu
->preempt_notifier
);
150 kvm_arch_vcpu_load(vcpu
, cpu
);
154 EXPORT_SYMBOL_GPL(vcpu_load
);
156 void vcpu_put(struct kvm_vcpu
*vcpu
)
159 kvm_arch_vcpu_put(vcpu
);
160 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
162 mutex_unlock(&vcpu
->mutex
);
164 EXPORT_SYMBOL_GPL(vcpu_put
);
166 static void ack_flush(void *_completed
)
170 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
175 struct kvm_vcpu
*vcpu
;
177 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
180 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
181 kvm_make_request(req
, vcpu
);
184 /* Set ->requests bit before we read ->mode. */
185 smp_mb__after_atomic();
187 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
188 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
189 cpumask_set_cpu(cpu
, cpus
);
191 if (unlikely(cpus
== NULL
))
192 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
193 else if (!cpumask_empty(cpus
))
194 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
198 free_cpumask_var(cpus
);
202 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
203 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
206 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
207 * kvm_make_all_cpus_request.
209 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
212 * We want to publish modifications to the page tables before reading
213 * mode. Pairs with a memory barrier in arch-specific code.
214 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
215 * and smp_mb in walk_shadow_page_lockless_begin/end.
216 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
218 * There is already an smp_mb__after_atomic() before
219 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
222 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
223 ++kvm
->stat
.remote_tlb_flush
;
224 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
226 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
229 void kvm_reload_remote_mmus(struct kvm
*kvm
)
231 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
234 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
239 mutex_init(&vcpu
->mutex
);
244 init_swait_queue_head(&vcpu
->wq
);
245 kvm_async_pf_vcpu_init(vcpu
);
248 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
250 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
255 vcpu
->run
= page_address(page
);
257 kvm_vcpu_set_in_spin_loop(vcpu
, false);
258 kvm_vcpu_set_dy_eligible(vcpu
, false);
259 vcpu
->preempted
= false;
261 r
= kvm_arch_vcpu_init(vcpu
);
267 free_page((unsigned long)vcpu
->run
);
271 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
273 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
276 kvm_arch_vcpu_uninit(vcpu
);
277 free_page((unsigned long)vcpu
->run
);
279 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
281 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
282 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
284 return container_of(mn
, struct kvm
, mmu_notifier
);
287 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
288 struct mm_struct
*mm
,
289 unsigned long address
)
291 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
292 int need_tlb_flush
, idx
;
295 * When ->invalidate_page runs, the linux pte has been zapped
296 * already but the page is still allocated until
297 * ->invalidate_page returns. So if we increase the sequence
298 * here the kvm page fault will notice if the spte can't be
299 * established because the page is going to be freed. If
300 * instead the kvm page fault establishes the spte before
301 * ->invalidate_page runs, kvm_unmap_hva will release it
304 * The sequence increase only need to be seen at spin_unlock
305 * time, and not at spin_lock time.
307 * Increasing the sequence after the spin_unlock would be
308 * unsafe because the kvm page fault could then establish the
309 * pte after kvm_unmap_hva returned, without noticing the page
310 * is going to be freed.
312 idx
= srcu_read_lock(&kvm
->srcu
);
313 spin_lock(&kvm
->mmu_lock
);
315 kvm
->mmu_notifier_seq
++;
316 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
317 /* we've to flush the tlb before the pages can be freed */
319 kvm_flush_remote_tlbs(kvm
);
321 spin_unlock(&kvm
->mmu_lock
);
323 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
325 srcu_read_unlock(&kvm
->srcu
, idx
);
328 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
329 struct mm_struct
*mm
,
330 unsigned long address
,
333 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
336 idx
= srcu_read_lock(&kvm
->srcu
);
337 spin_lock(&kvm
->mmu_lock
);
338 kvm
->mmu_notifier_seq
++;
339 kvm_set_spte_hva(kvm
, address
, pte
);
340 spin_unlock(&kvm
->mmu_lock
);
341 srcu_read_unlock(&kvm
->srcu
, idx
);
344 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
345 struct mm_struct
*mm
,
349 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
350 int need_tlb_flush
= 0, idx
;
352 idx
= srcu_read_lock(&kvm
->srcu
);
353 spin_lock(&kvm
->mmu_lock
);
355 * The count increase must become visible at unlock time as no
356 * spte can be established without taking the mmu_lock and
357 * count is also read inside the mmu_lock critical section.
359 kvm
->mmu_notifier_count
++;
360 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
361 need_tlb_flush
|= kvm
->tlbs_dirty
;
362 /* we've to flush the tlb before the pages can be freed */
364 kvm_flush_remote_tlbs(kvm
);
366 spin_unlock(&kvm
->mmu_lock
);
367 srcu_read_unlock(&kvm
->srcu
, idx
);
370 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
371 struct mm_struct
*mm
,
375 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
377 spin_lock(&kvm
->mmu_lock
);
379 * This sequence increase will notify the kvm page fault that
380 * the page that is going to be mapped in the spte could have
383 kvm
->mmu_notifier_seq
++;
386 * The above sequence increase must be visible before the
387 * below count decrease, which is ensured by the smp_wmb above
388 * in conjunction with the smp_rmb in mmu_notifier_retry().
390 kvm
->mmu_notifier_count
--;
391 spin_unlock(&kvm
->mmu_lock
);
393 BUG_ON(kvm
->mmu_notifier_count
< 0);
396 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
397 struct mm_struct
*mm
,
401 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
404 idx
= srcu_read_lock(&kvm
->srcu
);
405 spin_lock(&kvm
->mmu_lock
);
407 young
= kvm_age_hva(kvm
, start
, end
);
409 kvm_flush_remote_tlbs(kvm
);
411 spin_unlock(&kvm
->mmu_lock
);
412 srcu_read_unlock(&kvm
->srcu
, idx
);
417 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
418 struct mm_struct
*mm
,
422 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
425 idx
= srcu_read_lock(&kvm
->srcu
);
426 spin_lock(&kvm
->mmu_lock
);
428 * Even though we do not flush TLB, this will still adversely
429 * affect performance on pre-Haswell Intel EPT, where there is
430 * no EPT Access Bit to clear so that we have to tear down EPT
431 * tables instead. If we find this unacceptable, we can always
432 * add a parameter to kvm_age_hva so that it effectively doesn't
433 * do anything on clear_young.
435 * Also note that currently we never issue secondary TLB flushes
436 * from clear_young, leaving this job up to the regular system
437 * cadence. If we find this inaccurate, we might come up with a
438 * more sophisticated heuristic later.
440 young
= kvm_age_hva(kvm
, start
, end
);
441 spin_unlock(&kvm
->mmu_lock
);
442 srcu_read_unlock(&kvm
->srcu
, idx
);
447 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
448 struct mm_struct
*mm
,
449 unsigned long address
)
451 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
454 idx
= srcu_read_lock(&kvm
->srcu
);
455 spin_lock(&kvm
->mmu_lock
);
456 young
= kvm_test_age_hva(kvm
, address
);
457 spin_unlock(&kvm
->mmu_lock
);
458 srcu_read_unlock(&kvm
->srcu
, idx
);
463 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
464 struct mm_struct
*mm
)
466 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
469 idx
= srcu_read_lock(&kvm
->srcu
);
470 kvm_arch_flush_shadow_all(kvm
);
471 srcu_read_unlock(&kvm
->srcu
, idx
);
474 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
475 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
476 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
477 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
478 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
479 .clear_young
= kvm_mmu_notifier_clear_young
,
480 .test_young
= kvm_mmu_notifier_test_young
,
481 .change_pte
= kvm_mmu_notifier_change_pte
,
482 .release
= kvm_mmu_notifier_release
,
485 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
487 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
488 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
491 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
493 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
498 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
500 static struct kvm_memslots
*kvm_alloc_memslots(void)
503 struct kvm_memslots
*slots
;
505 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
510 * Init kvm generation close to the maximum to easily test the
511 * code of handling generation number wrap-around.
513 slots
->generation
= -150;
514 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
515 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
520 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
522 if (!memslot
->dirty_bitmap
)
525 kvfree(memslot
->dirty_bitmap
);
526 memslot
->dirty_bitmap
= NULL
;
530 * Free any memory in @free but not in @dont.
532 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
533 struct kvm_memory_slot
*dont
)
535 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
536 kvm_destroy_dirty_bitmap(free
);
538 kvm_arch_free_memslot(kvm
, free
, dont
);
543 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
545 struct kvm_memory_slot
*memslot
;
550 kvm_for_each_memslot(memslot
, slots
)
551 kvm_free_memslot(kvm
, memslot
, NULL
);
556 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
560 if (!kvm
->debugfs_dentry
)
563 debugfs_remove_recursive(kvm
->debugfs_dentry
);
565 if (kvm
->debugfs_stat_data
) {
566 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
567 kfree(kvm
->debugfs_stat_data
[i
]);
568 kfree(kvm
->debugfs_stat_data
);
572 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
574 char dir_name
[ITOA_MAX_LEN
* 2];
575 struct kvm_stat_data
*stat_data
;
576 struct kvm_stats_debugfs_item
*p
;
578 if (!debugfs_initialized())
581 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
582 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
,
584 if (!kvm
->debugfs_dentry
)
587 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
588 sizeof(*kvm
->debugfs_stat_data
),
590 if (!kvm
->debugfs_stat_data
)
593 for (p
= debugfs_entries
; p
->name
; p
++) {
594 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL
);
598 stat_data
->kvm
= kvm
;
599 stat_data
->offset
= p
->offset
;
600 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
601 if (!debugfs_create_file(p
->name
, 0644,
604 stat_fops_per_vm
[p
->kind
]))
610 static struct kvm
*kvm_create_vm(unsigned long type
)
613 struct kvm
*kvm
= kvm_arch_alloc_vm();
616 return ERR_PTR(-ENOMEM
);
618 spin_lock_init(&kvm
->mmu_lock
);
619 atomic_inc(¤t
->mm
->mm_count
);
620 kvm
->mm
= current
->mm
;
621 kvm_eventfd_init(kvm
);
622 mutex_init(&kvm
->lock
);
623 mutex_init(&kvm
->irq_lock
);
624 mutex_init(&kvm
->slots_lock
);
625 atomic_set(&kvm
->users_count
, 1);
626 INIT_LIST_HEAD(&kvm
->devices
);
628 r
= kvm_arch_init_vm(kvm
, type
);
630 goto out_err_no_disable
;
632 r
= hardware_enable_all();
634 goto out_err_no_disable
;
636 #ifdef CONFIG_HAVE_KVM_IRQFD
637 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
640 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
643 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
644 kvm
->memslots
[i
] = kvm_alloc_memslots();
645 if (!kvm
->memslots
[i
])
646 goto out_err_no_srcu
;
649 if (init_srcu_struct(&kvm
->srcu
))
650 goto out_err_no_srcu
;
651 if (init_srcu_struct(&kvm
->irq_srcu
))
652 goto out_err_no_irq_srcu
;
653 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
654 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
660 r
= kvm_init_mmu_notifier(kvm
);
664 spin_lock(&kvm_lock
);
665 list_add(&kvm
->vm_list
, &vm_list
);
666 spin_unlock(&kvm_lock
);
668 preempt_notifier_inc();
673 cleanup_srcu_struct(&kvm
->irq_srcu
);
675 cleanup_srcu_struct(&kvm
->srcu
);
677 hardware_disable_all();
679 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
680 kfree(kvm
->buses
[i
]);
681 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
682 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
683 kvm_arch_free_vm(kvm
);
689 * Avoid using vmalloc for a small buffer.
690 * Should not be used when the size is statically known.
692 void *kvm_kvzalloc(unsigned long size
)
694 if (size
> PAGE_SIZE
)
695 return vzalloc(size
);
697 return kzalloc(size
, GFP_KERNEL
);
700 static void kvm_destroy_devices(struct kvm
*kvm
)
702 struct kvm_device
*dev
, *tmp
;
705 * We do not need to take the kvm->lock here, because nobody else
706 * has a reference to the struct kvm at this point and therefore
707 * cannot access the devices list anyhow.
709 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
710 list_del(&dev
->vm_node
);
711 dev
->ops
->destroy(dev
);
715 static void kvm_destroy_vm(struct kvm
*kvm
)
718 struct mm_struct
*mm
= kvm
->mm
;
720 kvm_destroy_vm_debugfs(kvm
);
721 kvm_arch_sync_events(kvm
);
722 spin_lock(&kvm_lock
);
723 list_del(&kvm
->vm_list
);
724 spin_unlock(&kvm_lock
);
725 kvm_free_irq_routing(kvm
);
726 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
727 kvm_io_bus_destroy(kvm
->buses
[i
]);
728 kvm_coalesced_mmio_free(kvm
);
729 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
730 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
732 kvm_arch_flush_shadow_all(kvm
);
734 kvm_arch_destroy_vm(kvm
);
735 kvm_destroy_devices(kvm
);
736 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
737 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
738 cleanup_srcu_struct(&kvm
->irq_srcu
);
739 cleanup_srcu_struct(&kvm
->srcu
);
740 kvm_arch_free_vm(kvm
);
741 preempt_notifier_dec();
742 hardware_disable_all();
746 void kvm_get_kvm(struct kvm
*kvm
)
748 atomic_inc(&kvm
->users_count
);
750 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
752 void kvm_put_kvm(struct kvm
*kvm
)
754 if (atomic_dec_and_test(&kvm
->users_count
))
757 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
760 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
762 struct kvm
*kvm
= filp
->private_data
;
764 kvm_irqfd_release(kvm
);
771 * Allocation size is twice as large as the actual dirty bitmap size.
772 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
774 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
776 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
778 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
779 if (!memslot
->dirty_bitmap
)
786 * Insert memslot and re-sort memslots based on their GFN,
787 * so binary search could be used to lookup GFN.
788 * Sorting algorithm takes advantage of having initially
789 * sorted array and known changed memslot position.
791 static void update_memslots(struct kvm_memslots
*slots
,
792 struct kvm_memory_slot
*new)
795 int i
= slots
->id_to_index
[id
];
796 struct kvm_memory_slot
*mslots
= slots
->memslots
;
798 WARN_ON(mslots
[i
].id
!= id
);
800 WARN_ON(!mslots
[i
].npages
);
801 if (mslots
[i
].npages
)
804 if (!mslots
[i
].npages
)
808 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
809 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
810 if (!mslots
[i
+ 1].npages
)
812 mslots
[i
] = mslots
[i
+ 1];
813 slots
->id_to_index
[mslots
[i
].id
] = i
;
818 * The ">=" is needed when creating a slot with base_gfn == 0,
819 * so that it moves before all those with base_gfn == npages == 0.
821 * On the other hand, if new->npages is zero, the above loop has
822 * already left i pointing to the beginning of the empty part of
823 * mslots, and the ">=" would move the hole backwards in this
824 * case---which is wrong. So skip the loop when deleting a slot.
828 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
829 mslots
[i
] = mslots
[i
- 1];
830 slots
->id_to_index
[mslots
[i
].id
] = i
;
834 WARN_ON_ONCE(i
!= slots
->used_slots
);
837 slots
->id_to_index
[mslots
[i
].id
] = i
;
840 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
842 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
844 #ifdef __KVM_HAVE_READONLY_MEM
845 valid_flags
|= KVM_MEM_READONLY
;
848 if (mem
->flags
& ~valid_flags
)
854 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
855 int as_id
, struct kvm_memslots
*slots
)
857 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
860 * Set the low bit in the generation, which disables SPTE caching
861 * until the end of synchronize_srcu_expedited.
863 WARN_ON(old_memslots
->generation
& 1);
864 slots
->generation
= old_memslots
->generation
+ 1;
866 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
867 synchronize_srcu_expedited(&kvm
->srcu
);
870 * Increment the new memslot generation a second time. This prevents
871 * vm exits that race with memslot updates from caching a memslot
872 * generation that will (potentially) be valid forever.
876 kvm_arch_memslots_updated(kvm
, slots
);
882 * Allocate some memory and give it an address in the guest physical address
885 * Discontiguous memory is allowed, mostly for framebuffers.
887 * Must be called holding kvm->slots_lock for write.
889 int __kvm_set_memory_region(struct kvm
*kvm
,
890 const struct kvm_userspace_memory_region
*mem
)
894 unsigned long npages
;
895 struct kvm_memory_slot
*slot
;
896 struct kvm_memory_slot old
, new;
897 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
899 enum kvm_mr_change change
;
901 r
= check_memory_region_flags(mem
);
906 as_id
= mem
->slot
>> 16;
909 /* General sanity checks */
910 if (mem
->memory_size
& (PAGE_SIZE
- 1))
912 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
914 /* We can read the guest memory with __xxx_user() later on. */
915 if ((id
< KVM_USER_MEM_SLOTS
) &&
916 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
917 !access_ok(VERIFY_WRITE
,
918 (void __user
*)(unsigned long)mem
->userspace_addr
,
921 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
923 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
926 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
927 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
928 npages
= mem
->memory_size
>> PAGE_SHIFT
;
930 if (npages
> KVM_MEM_MAX_NR_PAGES
)
936 new.base_gfn
= base_gfn
;
938 new.flags
= mem
->flags
;
942 change
= KVM_MR_CREATE
;
943 else { /* Modify an existing slot. */
944 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
945 (npages
!= old
.npages
) ||
946 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
949 if (base_gfn
!= old
.base_gfn
)
950 change
= KVM_MR_MOVE
;
951 else if (new.flags
!= old
.flags
)
952 change
= KVM_MR_FLAGS_ONLY
;
953 else { /* Nothing to change. */
962 change
= KVM_MR_DELETE
;
967 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
968 /* Check for overlaps */
970 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
971 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
974 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
975 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
980 /* Free page dirty bitmap if unneeded */
981 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
982 new.dirty_bitmap
= NULL
;
985 if (change
== KVM_MR_CREATE
) {
986 new.userspace_addr
= mem
->userspace_addr
;
988 if (kvm_arch_create_memslot(kvm
, &new, npages
))
992 /* Allocate page dirty bitmap if needed */
993 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
994 if (kvm_create_dirty_bitmap(&new) < 0)
998 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
1001 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
1003 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
1004 slot
= id_to_memslot(slots
, id
);
1005 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1007 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1009 /* slot was deleted or moved, clear iommu mapping */
1010 kvm_iommu_unmap_pages(kvm
, &old
);
1011 /* From this point no new shadow pages pointing to a deleted,
1012 * or moved, memslot will be created.
1014 * validation of sp->gfn happens in:
1015 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1016 * - kvm_is_visible_gfn (mmu_check_roots)
1018 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1021 * We can re-use the old_memslots from above, the only difference
1022 * from the currently installed memslots is the invalid flag. This
1023 * will get overwritten by update_memslots anyway.
1025 slots
= old_memslots
;
1028 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
1032 /* actual memory is freed via old in kvm_free_memslot below */
1033 if (change
== KVM_MR_DELETE
) {
1034 new.dirty_bitmap
= NULL
;
1035 memset(&new.arch
, 0, sizeof(new.arch
));
1038 update_memslots(slots
, &new);
1039 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1041 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
1043 kvm_free_memslot(kvm
, &old
, &new);
1044 kvfree(old_memslots
);
1047 * IOMMU mapping: New slots need to be mapped. Old slots need to be
1048 * un-mapped and re-mapped if their base changes. Since base change
1049 * unmapping is handled above with slot deletion, mapping alone is
1050 * needed here. Anything else the iommu might care about for existing
1051 * slots (size changes, userspace addr changes and read-only flag
1052 * changes) is disallowed above, so any other attribute changes getting
1053 * here can be skipped.
1055 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
1056 r
= kvm_iommu_map_pages(kvm
, &new);
1065 kvm_free_memslot(kvm
, &new, &old
);
1069 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1071 int kvm_set_memory_region(struct kvm
*kvm
,
1072 const struct kvm_userspace_memory_region
*mem
)
1076 mutex_lock(&kvm
->slots_lock
);
1077 r
= __kvm_set_memory_region(kvm
, mem
);
1078 mutex_unlock(&kvm
->slots_lock
);
1081 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1083 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1084 struct kvm_userspace_memory_region
*mem
)
1086 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1089 return kvm_set_memory_region(kvm
, mem
);
1092 int kvm_get_dirty_log(struct kvm
*kvm
,
1093 struct kvm_dirty_log
*log
, int *is_dirty
)
1095 struct kvm_memslots
*slots
;
1096 struct kvm_memory_slot
*memslot
;
1097 int r
, i
, as_id
, id
;
1099 unsigned long any
= 0;
1102 as_id
= log
->slot
>> 16;
1103 id
= (u16
)log
->slot
;
1104 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1107 slots
= __kvm_memslots(kvm
, as_id
);
1108 memslot
= id_to_memslot(slots
, id
);
1110 if (!memslot
->dirty_bitmap
)
1113 n
= kvm_dirty_bitmap_bytes(memslot
);
1115 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1116 any
= memslot
->dirty_bitmap
[i
];
1119 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1129 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1131 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1133 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1134 * are dirty write protect them for next write.
1135 * @kvm: pointer to kvm instance
1136 * @log: slot id and address to which we copy the log
1137 * @is_dirty: flag set if any page is dirty
1139 * We need to keep it in mind that VCPU threads can write to the bitmap
1140 * concurrently. So, to avoid losing track of dirty pages we keep the
1143 * 1. Take a snapshot of the bit and clear it if needed.
1144 * 2. Write protect the corresponding page.
1145 * 3. Copy the snapshot to the userspace.
1146 * 4. Upon return caller flushes TLB's if needed.
1148 * Between 2 and 4, the guest may write to the page using the remaining TLB
1149 * entry. This is not a problem because the page is reported dirty using
1150 * the snapshot taken before and step 4 ensures that writes done after
1151 * exiting to userspace will be logged for the next call.
1154 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1155 struct kvm_dirty_log
*log
, bool *is_dirty
)
1157 struct kvm_memslots
*slots
;
1158 struct kvm_memory_slot
*memslot
;
1159 int r
, i
, as_id
, id
;
1161 unsigned long *dirty_bitmap
;
1162 unsigned long *dirty_bitmap_buffer
;
1165 as_id
= log
->slot
>> 16;
1166 id
= (u16
)log
->slot
;
1167 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1170 slots
= __kvm_memslots(kvm
, as_id
);
1171 memslot
= id_to_memslot(slots
, id
);
1173 dirty_bitmap
= memslot
->dirty_bitmap
;
1178 n
= kvm_dirty_bitmap_bytes(memslot
);
1180 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1181 memset(dirty_bitmap_buffer
, 0, n
);
1183 spin_lock(&kvm
->mmu_lock
);
1185 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1189 if (!dirty_bitmap
[i
])
1194 mask
= xchg(&dirty_bitmap
[i
], 0);
1195 dirty_bitmap_buffer
[i
] = mask
;
1198 offset
= i
* BITS_PER_LONG
;
1199 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1204 spin_unlock(&kvm
->mmu_lock
);
1207 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1214 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1217 bool kvm_largepages_enabled(void)
1219 return largepages_enabled
;
1222 void kvm_disable_largepages(void)
1224 largepages_enabled
= false;
1226 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1228 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1230 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1232 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1234 struct kvm_memory_slot
*kvm_vcpu_gfn_to_memslot(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1236 return __gfn_to_memslot(kvm_vcpu_memslots(vcpu
), gfn
);
1239 bool kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1241 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1243 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1244 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1249 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1251 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1253 struct vm_area_struct
*vma
;
1254 unsigned long addr
, size
;
1258 addr
= gfn_to_hva(kvm
, gfn
);
1259 if (kvm_is_error_hva(addr
))
1262 down_read(¤t
->mm
->mmap_sem
);
1263 vma
= find_vma(current
->mm
, addr
);
1267 size
= vma_kernel_pagesize(vma
);
1270 up_read(¤t
->mm
->mmap_sem
);
1275 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1277 return slot
->flags
& KVM_MEM_READONLY
;
1280 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1281 gfn_t
*nr_pages
, bool write
)
1283 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1284 return KVM_HVA_ERR_BAD
;
1286 if (memslot_is_readonly(slot
) && write
)
1287 return KVM_HVA_ERR_RO_BAD
;
1290 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1292 return __gfn_to_hva_memslot(slot
, gfn
);
1295 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1298 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1301 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1304 return gfn_to_hva_many(slot
, gfn
, NULL
);
1306 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1308 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1310 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1312 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1314 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1316 return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
, NULL
);
1318 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva
);
1321 * If writable is set to false, the hva returned by this function is only
1322 * allowed to be read.
1324 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1325 gfn_t gfn
, bool *writable
)
1327 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1329 if (!kvm_is_error_hva(hva
) && writable
)
1330 *writable
= !memslot_is_readonly(slot
);
1335 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1337 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1339 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1342 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu
*vcpu
, gfn_t gfn
, bool *writable
)
1344 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1346 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1349 static int get_user_page_nowait(unsigned long start
, int write
,
1352 int flags
= FOLL_NOWAIT
| FOLL_HWPOISON
;
1355 flags
|= FOLL_WRITE
;
1357 return get_user_pages(start
, 1, flags
, page
, NULL
);
1360 static inline int check_user_page_hwpoison(unsigned long addr
)
1362 int rc
, flags
= FOLL_HWPOISON
| FOLL_WRITE
;
1364 rc
= get_user_pages(addr
, 1, flags
, NULL
, NULL
);
1365 return rc
== -EHWPOISON
;
1369 * The atomic path to get the writable pfn which will be stored in @pfn,
1370 * true indicates success, otherwise false is returned.
1372 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1373 bool write_fault
, bool *writable
, kvm_pfn_t
*pfn
)
1375 struct page
*page
[1];
1378 if (!(async
|| atomic
))
1382 * Fast pin a writable pfn only if it is a write fault request
1383 * or the caller allows to map a writable pfn for a read fault
1386 if (!(write_fault
|| writable
))
1389 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1391 *pfn
= page_to_pfn(page
[0]);
1402 * The slow path to get the pfn of the specified host virtual address,
1403 * 1 indicates success, -errno is returned if error is detected.
1405 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1406 bool *writable
, kvm_pfn_t
*pfn
)
1408 struct page
*page
[1];
1414 *writable
= write_fault
;
1417 down_read(¤t
->mm
->mmap_sem
);
1418 npages
= get_user_page_nowait(addr
, write_fault
, page
);
1419 up_read(¤t
->mm
->mmap_sem
);
1421 unsigned int flags
= FOLL_TOUCH
| FOLL_HWPOISON
;
1424 flags
|= FOLL_WRITE
;
1426 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1432 /* map read fault as writable if possible */
1433 if (unlikely(!write_fault
) && writable
) {
1434 struct page
*wpage
[1];
1436 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1445 *pfn
= page_to_pfn(page
[0]);
1449 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1451 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1454 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1460 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1461 unsigned long addr
, bool *async
,
1462 bool write_fault
, kvm_pfn_t
*p_pfn
)
1467 r
= follow_pfn(vma
, addr
, &pfn
);
1470 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1471 * not call the fault handler, so do it here.
1473 bool unlocked
= false;
1474 r
= fixup_user_fault(current
, current
->mm
, addr
,
1475 (write_fault
? FAULT_FLAG_WRITE
: 0),
1482 r
= follow_pfn(vma
, addr
, &pfn
);
1490 * Get a reference here because callers of *hva_to_pfn* and
1491 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1492 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1493 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1494 * simply do nothing for reserved pfns.
1496 * Whoever called remap_pfn_range is also going to call e.g.
1497 * unmap_mapping_range before the underlying pages are freed,
1498 * causing a call to our MMU notifier.
1507 * Pin guest page in memory and return its pfn.
1508 * @addr: host virtual address which maps memory to the guest
1509 * @atomic: whether this function can sleep
1510 * @async: whether this function need to wait IO complete if the
1511 * host page is not in the memory
1512 * @write_fault: whether we should get a writable host page
1513 * @writable: whether it allows to map a writable host page for !@write_fault
1515 * The function will map a writable host page for these two cases:
1516 * 1): @write_fault = true
1517 * 2): @write_fault = false && @writable, @writable will tell the caller
1518 * whether the mapping is writable.
1520 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1521 bool write_fault
, bool *writable
)
1523 struct vm_area_struct
*vma
;
1527 /* we can do it either atomically or asynchronously, not both */
1528 BUG_ON(atomic
&& async
);
1530 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1534 return KVM_PFN_ERR_FAULT
;
1536 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1540 down_read(¤t
->mm
->mmap_sem
);
1541 if (npages
== -EHWPOISON
||
1542 (!async
&& check_user_page_hwpoison(addr
))) {
1543 pfn
= KVM_PFN_ERR_HWPOISON
;
1548 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1551 pfn
= KVM_PFN_ERR_FAULT
;
1552 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1553 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, &pfn
);
1557 pfn
= KVM_PFN_ERR_FAULT
;
1559 if (async
&& vma_is_valid(vma
, write_fault
))
1561 pfn
= KVM_PFN_ERR_FAULT
;
1564 up_read(¤t
->mm
->mmap_sem
);
1568 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1569 bool atomic
, bool *async
, bool write_fault
,
1572 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1574 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1577 return KVM_PFN_ERR_RO_FAULT
;
1580 if (kvm_is_error_hva(addr
)) {
1583 return KVM_PFN_NOSLOT
;
1586 /* Do not map writable pfn in the readonly memslot. */
1587 if (writable
&& memslot_is_readonly(slot
)) {
1592 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1595 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1597 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1600 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1601 write_fault
, writable
);
1603 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1605 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1607 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1609 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1611 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1613 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1615 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1617 kvm_pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1619 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1621 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1623 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1625 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1627 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1629 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1631 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1633 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1635 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1637 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1639 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1641 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1642 struct page
**pages
, int nr_pages
)
1647 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1648 if (kvm_is_error_hva(addr
))
1651 if (entry
< nr_pages
)
1654 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1656 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1658 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
1660 if (is_error_noslot_pfn(pfn
))
1661 return KVM_ERR_PTR_BAD_PAGE
;
1663 if (kvm_is_reserved_pfn(pfn
)) {
1665 return KVM_ERR_PTR_BAD_PAGE
;
1668 return pfn_to_page(pfn
);
1671 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1675 pfn
= gfn_to_pfn(kvm
, gfn
);
1677 return kvm_pfn_to_page(pfn
);
1679 EXPORT_SYMBOL_GPL(gfn_to_page
);
1681 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1685 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1687 return kvm_pfn_to_page(pfn
);
1689 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1691 void kvm_release_page_clean(struct page
*page
)
1693 WARN_ON(is_error_page(page
));
1695 kvm_release_pfn_clean(page_to_pfn(page
));
1697 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1699 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
1701 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1702 put_page(pfn_to_page(pfn
));
1704 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1706 void kvm_release_page_dirty(struct page
*page
)
1708 WARN_ON(is_error_page(page
));
1710 kvm_release_pfn_dirty(page_to_pfn(page
));
1712 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1714 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
1716 kvm_set_pfn_dirty(pfn
);
1717 kvm_release_pfn_clean(pfn
);
1720 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
1722 if (!kvm_is_reserved_pfn(pfn
)) {
1723 struct page
*page
= pfn_to_page(pfn
);
1725 if (!PageReserved(page
))
1729 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1731 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
1733 if (!kvm_is_reserved_pfn(pfn
))
1734 mark_page_accessed(pfn_to_page(pfn
));
1736 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1738 void kvm_get_pfn(kvm_pfn_t pfn
)
1740 if (!kvm_is_reserved_pfn(pfn
))
1741 get_page(pfn_to_page(pfn
));
1743 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1745 static int next_segment(unsigned long len
, int offset
)
1747 if (len
> PAGE_SIZE
- offset
)
1748 return PAGE_SIZE
- offset
;
1753 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1754 void *data
, int offset
, int len
)
1759 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1760 if (kvm_is_error_hva(addr
))
1762 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1768 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1771 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1773 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1775 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1777 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1778 int offset
, int len
)
1780 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1782 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1784 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1786 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1788 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1790 int offset
= offset_in_page(gpa
);
1793 while ((seg
= next_segment(len
, offset
)) != 0) {
1794 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1804 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1806 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1808 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1810 int offset
= offset_in_page(gpa
);
1813 while ((seg
= next_segment(len
, offset
)) != 0) {
1814 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1824 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1826 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1827 void *data
, int offset
, unsigned long len
)
1832 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1833 if (kvm_is_error_hva(addr
))
1835 pagefault_disable();
1836 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1843 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1846 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1847 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1848 int offset
= offset_in_page(gpa
);
1850 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1852 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1854 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1855 void *data
, unsigned long len
)
1857 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1858 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1859 int offset
= offset_in_page(gpa
);
1861 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1863 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1865 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1866 const void *data
, int offset
, int len
)
1871 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1872 if (kvm_is_error_hva(addr
))
1874 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1877 mark_page_dirty_in_slot(memslot
, gfn
);
1881 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1882 const void *data
, int offset
, int len
)
1884 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1886 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1888 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1890 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1891 const void *data
, int offset
, int len
)
1893 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1895 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1897 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1899 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1902 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1904 int offset
= offset_in_page(gpa
);
1907 while ((seg
= next_segment(len
, offset
)) != 0) {
1908 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1918 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1920 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1923 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1925 int offset
= offset_in_page(gpa
);
1928 while ((seg
= next_segment(len
, offset
)) != 0) {
1929 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1939 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1941 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1942 gpa_t gpa
, unsigned long len
)
1944 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1945 int offset
= offset_in_page(gpa
);
1946 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1947 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1948 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1949 gfn_t nr_pages_avail
;
1952 ghc
->generation
= slots
->generation
;
1954 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1955 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1956 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1960 * If the requested region crosses two memslots, we still
1961 * verify that the entire region is valid here.
1963 while (start_gfn
<= end_gfn
) {
1964 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1965 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1967 if (kvm_is_error_hva(ghc
->hva
))
1969 start_gfn
+= nr_pages_avail
;
1971 /* Use the slow path for cross page reads and writes. */
1972 ghc
->memslot
= NULL
;
1976 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1978 int kvm_write_guest_offset_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1979 void *data
, int offset
, unsigned long len
)
1981 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1983 gpa_t gpa
= ghc
->gpa
+ offset
;
1985 BUG_ON(len
+ offset
> ghc
->len
);
1987 if (slots
->generation
!= ghc
->generation
)
1988 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1990 if (unlikely(!ghc
->memslot
))
1991 return kvm_write_guest(kvm
, gpa
, data
, len
);
1993 if (kvm_is_error_hva(ghc
->hva
))
1996 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
1999 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2003 EXPORT_SYMBOL_GPL(kvm_write_guest_offset_cached
);
2005 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2006 void *data
, unsigned long len
)
2008 return kvm_write_guest_offset_cached(kvm
, ghc
, data
, 0, len
);
2010 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
2012 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
2013 void *data
, unsigned long len
)
2015 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
2018 BUG_ON(len
> ghc
->len
);
2020 if (slots
->generation
!= ghc
->generation
)
2021 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
2023 if (unlikely(!ghc
->memslot
))
2024 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
2026 if (kvm_is_error_hva(ghc
->hva
))
2029 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
2035 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
2037 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2039 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2041 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2043 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2045 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2047 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2049 int offset
= offset_in_page(gpa
);
2052 while ((seg
= next_segment(len
, offset
)) != 0) {
2053 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2062 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2064 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2067 if (memslot
&& memslot
->dirty_bitmap
) {
2068 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2070 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2074 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2076 struct kvm_memory_slot
*memslot
;
2078 memslot
= gfn_to_memslot(kvm
, gfn
);
2079 mark_page_dirty_in_slot(memslot
, gfn
);
2081 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2083 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2085 struct kvm_memory_slot
*memslot
;
2087 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2088 mark_page_dirty_in_slot(memslot
, gfn
);
2090 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2092 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2094 unsigned int old
, val
, grow
;
2096 old
= val
= vcpu
->halt_poll_ns
;
2097 grow
= READ_ONCE(halt_poll_ns_grow
);
2099 if (val
== 0 && grow
)
2104 if (val
> halt_poll_ns
)
2107 vcpu
->halt_poll_ns
= val
;
2108 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2111 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2113 unsigned int old
, val
, shrink
;
2115 old
= val
= vcpu
->halt_poll_ns
;
2116 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2122 vcpu
->halt_poll_ns
= val
;
2123 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2126 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2128 if (kvm_arch_vcpu_runnable(vcpu
)) {
2129 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2132 if (kvm_cpu_has_pending_timer(vcpu
))
2134 if (signal_pending(current
))
2141 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2143 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2146 DECLARE_SWAITQUEUE(wait
);
2147 bool waited
= false;
2150 start
= cur
= ktime_get();
2151 if (vcpu
->halt_poll_ns
) {
2152 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2154 ++vcpu
->stat
.halt_attempted_poll
;
2157 * This sets KVM_REQ_UNHALT if an interrupt
2160 if (kvm_vcpu_check_block(vcpu
) < 0) {
2161 ++vcpu
->stat
.halt_successful_poll
;
2162 if (!vcpu_valid_wakeup(vcpu
))
2163 ++vcpu
->stat
.halt_poll_invalid
;
2167 } while (single_task_running() && ktime_before(cur
, stop
));
2170 kvm_arch_vcpu_blocking(vcpu
);
2173 prepare_to_swait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2175 if (kvm_vcpu_check_block(vcpu
) < 0)
2182 finish_swait(&vcpu
->wq
, &wait
);
2185 kvm_arch_vcpu_unblocking(vcpu
);
2187 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2189 if (!vcpu_valid_wakeup(vcpu
))
2190 shrink_halt_poll_ns(vcpu
);
2191 else if (halt_poll_ns
) {
2192 if (block_ns
<= vcpu
->halt_poll_ns
)
2194 /* we had a long block, shrink polling */
2195 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2196 shrink_halt_poll_ns(vcpu
);
2197 /* we had a short halt and our poll time is too small */
2198 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2199 block_ns
< halt_poll_ns
)
2200 grow_halt_poll_ns(vcpu
);
2202 vcpu
->halt_poll_ns
= 0;
2204 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2205 kvm_arch_vcpu_block_finish(vcpu
);
2207 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2210 void kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2212 struct swait_queue_head
*wqp
;
2214 wqp
= kvm_arch_vcpu_wq(vcpu
);
2215 if (swait_active(wqp
)) {
2217 ++vcpu
->stat
.halt_wakeup
;
2221 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2224 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2226 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2229 int cpu
= vcpu
->cpu
;
2231 kvm_vcpu_wake_up(vcpu
);
2233 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2234 if (kvm_arch_vcpu_should_kick(vcpu
))
2235 smp_send_reschedule(cpu
);
2238 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2239 #endif /* !CONFIG_S390 */
2241 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2244 struct task_struct
*task
= NULL
;
2248 pid
= rcu_dereference(target
->pid
);
2250 task
= get_pid_task(pid
, PIDTYPE_PID
);
2254 ret
= yield_to(task
, 1);
2255 put_task_struct(task
);
2259 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2262 * Helper that checks whether a VCPU is eligible for directed yield.
2263 * Most eligible candidate to yield is decided by following heuristics:
2265 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2266 * (preempted lock holder), indicated by @in_spin_loop.
2267 * Set at the beiginning and cleared at the end of interception/PLE handler.
2269 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2270 * chance last time (mostly it has become eligible now since we have probably
2271 * yielded to lockholder in last iteration. This is done by toggling
2272 * @dy_eligible each time a VCPU checked for eligibility.)
2274 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2275 * to preempted lock-holder could result in wrong VCPU selection and CPU
2276 * burning. Giving priority for a potential lock-holder increases lock
2279 * Since algorithm is based on heuristics, accessing another VCPU data without
2280 * locking does not harm. It may result in trying to yield to same VCPU, fail
2281 * and continue with next VCPU and so on.
2283 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2285 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2288 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2289 vcpu
->spin_loop
.dy_eligible
;
2291 if (vcpu
->spin_loop
.in_spin_loop
)
2292 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2300 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2302 struct kvm
*kvm
= me
->kvm
;
2303 struct kvm_vcpu
*vcpu
;
2304 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2310 kvm_vcpu_set_in_spin_loop(me
, true);
2312 * We boost the priority of a VCPU that is runnable but not
2313 * currently running, because it got preempted by something
2314 * else and called schedule in __vcpu_run. Hopefully that
2315 * VCPU is holding the lock that we need and will release it.
2316 * We approximate round-robin by starting at the last boosted VCPU.
2318 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2319 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2320 if (!pass
&& i
<= last_boosted_vcpu
) {
2321 i
= last_boosted_vcpu
;
2323 } else if (pass
&& i
> last_boosted_vcpu
)
2325 if (!ACCESS_ONCE(vcpu
->preempted
))
2329 if (swait_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2331 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2334 yielded
= kvm_vcpu_yield_to(vcpu
);
2336 kvm
->last_boosted_vcpu
= i
;
2338 } else if (yielded
< 0) {
2345 kvm_vcpu_set_in_spin_loop(me
, false);
2347 /* Ensure vcpu is not eligible during next spinloop */
2348 kvm_vcpu_set_dy_eligible(me
, false);
2350 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2352 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
2354 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
2357 if (vmf
->pgoff
== 0)
2358 page
= virt_to_page(vcpu
->run
);
2360 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2361 page
= virt_to_page(vcpu
->arch
.pio_data
);
2363 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2364 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2365 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2368 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2374 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2375 .fault
= kvm_vcpu_fault
,
2378 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2380 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2384 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2386 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2388 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2389 kvm_put_kvm(vcpu
->kvm
);
2393 static struct file_operations kvm_vcpu_fops
= {
2394 .release
= kvm_vcpu_release
,
2395 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2396 #ifdef CONFIG_KVM_COMPAT
2397 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2399 .mmap
= kvm_vcpu_mmap
,
2400 .llseek
= noop_llseek
,
2404 * Allocates an inode for the vcpu.
2406 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2408 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2411 static int kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2413 char dir_name
[ITOA_MAX_LEN
* 2];
2416 if (!kvm_arch_has_vcpu_debugfs())
2419 if (!debugfs_initialized())
2422 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
2423 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
2424 vcpu
->kvm
->debugfs_dentry
);
2425 if (!vcpu
->debugfs_dentry
)
2428 ret
= kvm_arch_create_vcpu_debugfs(vcpu
);
2430 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2438 * Creates some virtual cpus. Good luck creating more than one.
2440 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2443 struct kvm_vcpu
*vcpu
;
2445 if (id
>= KVM_MAX_VCPU_ID
)
2448 mutex_lock(&kvm
->lock
);
2449 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
2450 mutex_unlock(&kvm
->lock
);
2454 kvm
->created_vcpus
++;
2455 mutex_unlock(&kvm
->lock
);
2457 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2460 goto vcpu_decrement
;
2463 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2465 r
= kvm_arch_vcpu_setup(vcpu
);
2469 r
= kvm_create_vcpu_debugfs(vcpu
);
2473 mutex_lock(&kvm
->lock
);
2474 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2476 goto unlock_vcpu_destroy
;
2479 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2481 /* Now it's all set up, let userspace reach it */
2483 r
= create_vcpu_fd(vcpu
);
2486 goto unlock_vcpu_destroy
;
2489 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2492 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2493 * before kvm->online_vcpu's incremented value.
2496 atomic_inc(&kvm
->online_vcpus
);
2498 mutex_unlock(&kvm
->lock
);
2499 kvm_arch_vcpu_postcreate(vcpu
);
2502 unlock_vcpu_destroy
:
2503 mutex_unlock(&kvm
->lock
);
2504 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2506 kvm_arch_vcpu_destroy(vcpu
);
2508 mutex_lock(&kvm
->lock
);
2509 kvm
->created_vcpus
--;
2510 mutex_unlock(&kvm
->lock
);
2514 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2517 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2518 vcpu
->sigset_active
= 1;
2519 vcpu
->sigset
= *sigset
;
2521 vcpu
->sigset_active
= 0;
2525 static long kvm_vcpu_ioctl(struct file
*filp
,
2526 unsigned int ioctl
, unsigned long arg
)
2528 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2529 void __user
*argp
= (void __user
*)arg
;
2531 struct kvm_fpu
*fpu
= NULL
;
2532 struct kvm_sregs
*kvm_sregs
= NULL
;
2534 if (vcpu
->kvm
->mm
!= current
->mm
)
2537 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2540 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2542 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2543 * so vcpu_load() would break it.
2545 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2546 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2550 r
= vcpu_load(vcpu
);
2558 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2559 /* The thread running this VCPU changed. */
2560 struct pid
*oldpid
= vcpu
->pid
;
2561 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2563 rcu_assign_pointer(vcpu
->pid
, newpid
);
2568 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2569 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2571 case KVM_GET_REGS
: {
2572 struct kvm_regs
*kvm_regs
;
2575 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2578 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2582 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2589 case KVM_SET_REGS
: {
2590 struct kvm_regs
*kvm_regs
;
2593 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2594 if (IS_ERR(kvm_regs
)) {
2595 r
= PTR_ERR(kvm_regs
);
2598 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2602 case KVM_GET_SREGS
: {
2603 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2607 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2611 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2616 case KVM_SET_SREGS
: {
2617 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2618 if (IS_ERR(kvm_sregs
)) {
2619 r
= PTR_ERR(kvm_sregs
);
2623 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2626 case KVM_GET_MP_STATE
: {
2627 struct kvm_mp_state mp_state
;
2629 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2633 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2638 case KVM_SET_MP_STATE
: {
2639 struct kvm_mp_state mp_state
;
2642 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2644 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2647 case KVM_TRANSLATE
: {
2648 struct kvm_translation tr
;
2651 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2653 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2657 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2662 case KVM_SET_GUEST_DEBUG
: {
2663 struct kvm_guest_debug dbg
;
2666 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2668 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2671 case KVM_SET_SIGNAL_MASK
: {
2672 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2673 struct kvm_signal_mask kvm_sigmask
;
2674 sigset_t sigset
, *p
;
2679 if (copy_from_user(&kvm_sigmask
, argp
,
2680 sizeof(kvm_sigmask
)))
2683 if (kvm_sigmask
.len
!= sizeof(sigset
))
2686 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2691 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2695 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2699 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2703 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2709 fpu
= memdup_user(argp
, sizeof(*fpu
));
2715 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2719 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2728 #ifdef CONFIG_KVM_COMPAT
2729 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2730 unsigned int ioctl
, unsigned long arg
)
2732 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2733 void __user
*argp
= compat_ptr(arg
);
2736 if (vcpu
->kvm
->mm
!= current
->mm
)
2740 case KVM_SET_SIGNAL_MASK
: {
2741 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2742 struct kvm_signal_mask kvm_sigmask
;
2743 compat_sigset_t csigset
;
2748 if (copy_from_user(&kvm_sigmask
, argp
,
2749 sizeof(kvm_sigmask
)))
2752 if (kvm_sigmask
.len
!= sizeof(csigset
))
2755 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2758 sigset_from_compat(&sigset
, &csigset
);
2759 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2761 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2765 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2773 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2774 int (*accessor
)(struct kvm_device
*dev
,
2775 struct kvm_device_attr
*attr
),
2778 struct kvm_device_attr attr
;
2783 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2786 return accessor(dev
, &attr
);
2789 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2792 struct kvm_device
*dev
= filp
->private_data
;
2795 case KVM_SET_DEVICE_ATTR
:
2796 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2797 case KVM_GET_DEVICE_ATTR
:
2798 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2799 case KVM_HAS_DEVICE_ATTR
:
2800 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2802 if (dev
->ops
->ioctl
)
2803 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2809 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2811 struct kvm_device
*dev
= filp
->private_data
;
2812 struct kvm
*kvm
= dev
->kvm
;
2818 static const struct file_operations kvm_device_fops
= {
2819 .unlocked_ioctl
= kvm_device_ioctl
,
2820 #ifdef CONFIG_KVM_COMPAT
2821 .compat_ioctl
= kvm_device_ioctl
,
2823 .release
= kvm_device_release
,
2826 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2828 if (filp
->f_op
!= &kvm_device_fops
)
2831 return filp
->private_data
;
2834 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2835 #ifdef CONFIG_KVM_MPIC
2836 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2837 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2840 #ifdef CONFIG_KVM_XICS
2841 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2845 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2847 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2850 if (kvm_device_ops_table
[type
] != NULL
)
2853 kvm_device_ops_table
[type
] = ops
;
2857 void kvm_unregister_device_ops(u32 type
)
2859 if (kvm_device_ops_table
[type
] != NULL
)
2860 kvm_device_ops_table
[type
] = NULL
;
2863 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2864 struct kvm_create_device
*cd
)
2866 struct kvm_device_ops
*ops
= NULL
;
2867 struct kvm_device
*dev
;
2868 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2871 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2874 ops
= kvm_device_ops_table
[cd
->type
];
2881 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2888 mutex_lock(&kvm
->lock
);
2889 ret
= ops
->create(dev
, cd
->type
);
2891 mutex_unlock(&kvm
->lock
);
2895 list_add(&dev
->vm_node
, &kvm
->devices
);
2896 mutex_unlock(&kvm
->lock
);
2901 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2903 mutex_lock(&kvm
->lock
);
2904 list_del(&dev
->vm_node
);
2905 mutex_unlock(&kvm
->lock
);
2915 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2918 case KVM_CAP_USER_MEMORY
:
2919 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2920 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2921 case KVM_CAP_INTERNAL_ERROR_DATA
:
2922 #ifdef CONFIG_HAVE_KVM_MSI
2923 case KVM_CAP_SIGNAL_MSI
:
2925 #ifdef CONFIG_HAVE_KVM_IRQFD
2927 case KVM_CAP_IRQFD_RESAMPLE
:
2929 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
2930 case KVM_CAP_CHECK_EXTENSION_VM
:
2932 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2933 case KVM_CAP_IRQ_ROUTING
:
2934 return KVM_MAX_IRQ_ROUTES
;
2936 #if KVM_ADDRESS_SPACE_NUM > 1
2937 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2938 return KVM_ADDRESS_SPACE_NUM
;
2940 case KVM_CAP_MAX_VCPU_ID
:
2941 return KVM_MAX_VCPU_ID
;
2945 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2948 static long kvm_vm_ioctl(struct file
*filp
,
2949 unsigned int ioctl
, unsigned long arg
)
2951 struct kvm
*kvm
= filp
->private_data
;
2952 void __user
*argp
= (void __user
*)arg
;
2955 if (kvm
->mm
!= current
->mm
)
2958 case KVM_CREATE_VCPU
:
2959 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2961 case KVM_SET_USER_MEMORY_REGION
: {
2962 struct kvm_userspace_memory_region kvm_userspace_mem
;
2965 if (copy_from_user(&kvm_userspace_mem
, argp
,
2966 sizeof(kvm_userspace_mem
)))
2969 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2972 case KVM_GET_DIRTY_LOG
: {
2973 struct kvm_dirty_log log
;
2976 if (copy_from_user(&log
, argp
, sizeof(log
)))
2978 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2981 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2982 case KVM_REGISTER_COALESCED_MMIO
: {
2983 struct kvm_coalesced_mmio_zone zone
;
2986 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2988 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2991 case KVM_UNREGISTER_COALESCED_MMIO
: {
2992 struct kvm_coalesced_mmio_zone zone
;
2995 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2997 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3002 struct kvm_irqfd data
;
3005 if (copy_from_user(&data
, argp
, sizeof(data
)))
3007 r
= kvm_irqfd(kvm
, &data
);
3010 case KVM_IOEVENTFD
: {
3011 struct kvm_ioeventfd data
;
3014 if (copy_from_user(&data
, argp
, sizeof(data
)))
3016 r
= kvm_ioeventfd(kvm
, &data
);
3019 #ifdef CONFIG_HAVE_KVM_MSI
3020 case KVM_SIGNAL_MSI
: {
3024 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3026 r
= kvm_send_userspace_msi(kvm
, &msi
);
3030 #ifdef __KVM_HAVE_IRQ_LINE
3031 case KVM_IRQ_LINE_STATUS
:
3032 case KVM_IRQ_LINE
: {
3033 struct kvm_irq_level irq_event
;
3036 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3039 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3040 ioctl
== KVM_IRQ_LINE_STATUS
);
3045 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3046 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3054 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3055 case KVM_SET_GSI_ROUTING
: {
3056 struct kvm_irq_routing routing
;
3057 struct kvm_irq_routing __user
*urouting
;
3058 struct kvm_irq_routing_entry
*entries
= NULL
;
3061 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3064 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3070 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
3075 if (copy_from_user(entries
, urouting
->entries
,
3076 routing
.nr
* sizeof(*entries
)))
3077 goto out_free_irq_routing
;
3079 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3081 out_free_irq_routing
:
3085 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3086 case KVM_CREATE_DEVICE
: {
3087 struct kvm_create_device cd
;
3090 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3093 r
= kvm_ioctl_create_device(kvm
, &cd
);
3098 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3104 case KVM_CHECK_EXTENSION
:
3105 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3108 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3114 #ifdef CONFIG_KVM_COMPAT
3115 struct compat_kvm_dirty_log
{
3119 compat_uptr_t dirty_bitmap
; /* one bit per page */
3124 static long kvm_vm_compat_ioctl(struct file
*filp
,
3125 unsigned int ioctl
, unsigned long arg
)
3127 struct kvm
*kvm
= filp
->private_data
;
3130 if (kvm
->mm
!= current
->mm
)
3133 case KVM_GET_DIRTY_LOG
: {
3134 struct compat_kvm_dirty_log compat_log
;
3135 struct kvm_dirty_log log
;
3138 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3139 sizeof(compat_log
)))
3141 log
.slot
= compat_log
.slot
;
3142 log
.padding1
= compat_log
.padding1
;
3143 log
.padding2
= compat_log
.padding2
;
3144 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3146 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3150 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3158 static struct file_operations kvm_vm_fops
= {
3159 .release
= kvm_vm_release
,
3160 .unlocked_ioctl
= kvm_vm_ioctl
,
3161 #ifdef CONFIG_KVM_COMPAT
3162 .compat_ioctl
= kvm_vm_compat_ioctl
,
3164 .llseek
= noop_llseek
,
3167 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3173 kvm
= kvm_create_vm(type
);
3175 return PTR_ERR(kvm
);
3176 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3177 r
= kvm_coalesced_mmio_init(kvm
);
3183 r
= get_unused_fd_flags(O_CLOEXEC
);
3188 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3192 return PTR_ERR(file
);
3195 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3201 fd_install(r
, file
);
3205 static long kvm_dev_ioctl(struct file
*filp
,
3206 unsigned int ioctl
, unsigned long arg
)
3211 case KVM_GET_API_VERSION
:
3214 r
= KVM_API_VERSION
;
3217 r
= kvm_dev_ioctl_create_vm(arg
);
3219 case KVM_CHECK_EXTENSION
:
3220 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3222 case KVM_GET_VCPU_MMAP_SIZE
:
3225 r
= PAGE_SIZE
; /* struct kvm_run */
3227 r
+= PAGE_SIZE
; /* pio data page */
3229 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3230 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3233 case KVM_TRACE_ENABLE
:
3234 case KVM_TRACE_PAUSE
:
3235 case KVM_TRACE_DISABLE
:
3239 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3245 static struct file_operations kvm_chardev_ops
= {
3246 .unlocked_ioctl
= kvm_dev_ioctl
,
3247 .compat_ioctl
= kvm_dev_ioctl
,
3248 .llseek
= noop_llseek
,
3251 static struct miscdevice kvm_dev
= {
3257 static void hardware_enable_nolock(void *junk
)
3259 int cpu
= raw_smp_processor_id();
3262 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3265 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3267 r
= kvm_arch_hardware_enable();
3270 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3271 atomic_inc(&hardware_enable_failed
);
3272 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3276 static int kvm_starting_cpu(unsigned int cpu
)
3278 raw_spin_lock(&kvm_count_lock
);
3279 if (kvm_usage_count
)
3280 hardware_enable_nolock(NULL
);
3281 raw_spin_unlock(&kvm_count_lock
);
3285 static void hardware_disable_nolock(void *junk
)
3287 int cpu
= raw_smp_processor_id();
3289 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3291 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3292 kvm_arch_hardware_disable();
3295 static int kvm_dying_cpu(unsigned int cpu
)
3297 raw_spin_lock(&kvm_count_lock
);
3298 if (kvm_usage_count
)
3299 hardware_disable_nolock(NULL
);
3300 raw_spin_unlock(&kvm_count_lock
);
3304 static void hardware_disable_all_nolock(void)
3306 BUG_ON(!kvm_usage_count
);
3309 if (!kvm_usage_count
)
3310 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3313 static void hardware_disable_all(void)
3315 raw_spin_lock(&kvm_count_lock
);
3316 hardware_disable_all_nolock();
3317 raw_spin_unlock(&kvm_count_lock
);
3320 static int hardware_enable_all(void)
3324 raw_spin_lock(&kvm_count_lock
);
3327 if (kvm_usage_count
== 1) {
3328 atomic_set(&hardware_enable_failed
, 0);
3329 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3331 if (atomic_read(&hardware_enable_failed
)) {
3332 hardware_disable_all_nolock();
3337 raw_spin_unlock(&kvm_count_lock
);
3342 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3346 * Some (well, at least mine) BIOSes hang on reboot if
3349 * And Intel TXT required VMX off for all cpu when system shutdown.
3351 pr_info("kvm: exiting hardware virtualization\n");
3352 kvm_rebooting
= true;
3353 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3357 static struct notifier_block kvm_reboot_notifier
= {
3358 .notifier_call
= kvm_reboot
,
3362 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3366 for (i
= 0; i
< bus
->dev_count
; i
++) {
3367 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3369 kvm_iodevice_destructor(pos
);
3374 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3375 const struct kvm_io_range
*r2
)
3377 gpa_t addr1
= r1
->addr
;
3378 gpa_t addr2
= r2
->addr
;
3383 /* If r2->len == 0, match the exact address. If r2->len != 0,
3384 * accept any overlapping write. Any order is acceptable for
3385 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3386 * we process all of them.
3399 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3401 return kvm_io_bus_cmp(p1
, p2
);
3404 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3405 gpa_t addr
, int len
)
3407 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3413 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3414 kvm_io_bus_sort_cmp
, NULL
);
3419 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3420 gpa_t addr
, int len
)
3422 struct kvm_io_range
*range
, key
;
3425 key
= (struct kvm_io_range
) {
3430 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3431 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3435 off
= range
- bus
->range
;
3437 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3443 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3444 struct kvm_io_range
*range
, const void *val
)
3448 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3452 while (idx
< bus
->dev_count
&&
3453 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3454 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3463 /* kvm_io_bus_write - called under kvm->slots_lock */
3464 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3465 int len
, const void *val
)
3467 struct kvm_io_bus
*bus
;
3468 struct kvm_io_range range
;
3471 range
= (struct kvm_io_range
) {
3476 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3477 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3478 return r
< 0 ? r
: 0;
3481 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3482 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3483 gpa_t addr
, int len
, const void *val
, long cookie
)
3485 struct kvm_io_bus
*bus
;
3486 struct kvm_io_range range
;
3488 range
= (struct kvm_io_range
) {
3493 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3495 /* First try the device referenced by cookie. */
3496 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3497 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3498 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3503 * cookie contained garbage; fall back to search and return the
3504 * correct cookie value.
3506 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3509 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3510 struct kvm_io_range
*range
, void *val
)
3514 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3518 while (idx
< bus
->dev_count
&&
3519 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3520 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3528 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3530 /* kvm_io_bus_read - called under kvm->slots_lock */
3531 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3534 struct kvm_io_bus
*bus
;
3535 struct kvm_io_range range
;
3538 range
= (struct kvm_io_range
) {
3543 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3544 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3545 return r
< 0 ? r
: 0;
3549 /* Caller must hold slots_lock. */
3550 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3551 int len
, struct kvm_io_device
*dev
)
3553 struct kvm_io_bus
*new_bus
, *bus
;
3555 bus
= kvm
->buses
[bus_idx
];
3556 /* exclude ioeventfd which is limited by maximum fd */
3557 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3560 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3561 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3564 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3565 sizeof(struct kvm_io_range
)));
3566 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3567 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3568 synchronize_srcu_expedited(&kvm
->srcu
);
3574 /* Caller must hold slots_lock. */
3575 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3576 struct kvm_io_device
*dev
)
3579 struct kvm_io_bus
*new_bus
, *bus
;
3581 bus
= kvm
->buses
[bus_idx
];
3583 for (i
= 0; i
< bus
->dev_count
; i
++)
3584 if (bus
->range
[i
].dev
== dev
) {
3592 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3593 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3597 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3598 new_bus
->dev_count
--;
3599 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3600 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3602 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3603 synchronize_srcu_expedited(&kvm
->srcu
);
3608 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3611 struct kvm_io_bus
*bus
;
3612 int dev_idx
, srcu_idx
;
3613 struct kvm_io_device
*iodev
= NULL
;
3615 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
3617 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3619 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
3623 iodev
= bus
->range
[dev_idx
].dev
;
3626 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
3630 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
3632 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
3633 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
3636 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3639 /* The debugfs files are a reference to the kvm struct which
3640 * is still valid when kvm_destroy_vm is called.
3641 * To avoid the race between open and the removal of the debugfs
3642 * directory we test against the users count.
3644 if (!atomic_add_unless(&stat_data
->kvm
->users_count
, 1, 0))
3647 if (simple_attr_open(inode
, file
, get
, set
, fmt
)) {
3648 kvm_put_kvm(stat_data
->kvm
);
3655 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
3657 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3660 simple_attr_release(inode
, file
);
3661 kvm_put_kvm(stat_data
->kvm
);
3666 static int vm_stat_get_per_vm(void *data
, u64
*val
)
3668 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3670 *val
= *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
);
3675 static int vm_stat_clear_per_vm(void *data
, u64 val
)
3677 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3682 *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
) = 0;
3687 static int vm_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3689 __simple_attr_check_format("%llu\n", 0ull);
3690 return kvm_debugfs_open(inode
, file
, vm_stat_get_per_vm
,
3691 vm_stat_clear_per_vm
, "%llu\n");
3694 static const struct file_operations vm_stat_get_per_vm_fops
= {
3695 .owner
= THIS_MODULE
,
3696 .open
= vm_stat_get_per_vm_open
,
3697 .release
= kvm_debugfs_release
,
3698 .read
= simple_attr_read
,
3699 .write
= simple_attr_write
,
3700 .llseek
= generic_file_llseek
,
3703 static int vcpu_stat_get_per_vm(void *data
, u64
*val
)
3706 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3707 struct kvm_vcpu
*vcpu
;
3711 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3712 *val
+= *(u64
*)((void *)vcpu
+ stat_data
->offset
);
3717 static int vcpu_stat_clear_per_vm(void *data
, u64 val
)
3720 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3721 struct kvm_vcpu
*vcpu
;
3726 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3727 *(u64
*)((void *)vcpu
+ stat_data
->offset
) = 0;
3732 static int vcpu_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3734 __simple_attr_check_format("%llu\n", 0ull);
3735 return kvm_debugfs_open(inode
, file
, vcpu_stat_get_per_vm
,
3736 vcpu_stat_clear_per_vm
, "%llu\n");
3739 static const struct file_operations vcpu_stat_get_per_vm_fops
= {
3740 .owner
= THIS_MODULE
,
3741 .open
= vcpu_stat_get_per_vm_open
,
3742 .release
= kvm_debugfs_release
,
3743 .read
= simple_attr_read
,
3744 .write
= simple_attr_write
,
3745 .llseek
= generic_file_llseek
,
3748 static const struct file_operations
*stat_fops_per_vm
[] = {
3749 [KVM_STAT_VCPU
] = &vcpu_stat_get_per_vm_fops
,
3750 [KVM_STAT_VM
] = &vm_stat_get_per_vm_fops
,
3753 static int vm_stat_get(void *_offset
, u64
*val
)
3755 unsigned offset
= (long)_offset
;
3757 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3761 spin_lock(&kvm_lock
);
3762 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3764 vm_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
3767 spin_unlock(&kvm_lock
);
3771 static int vm_stat_clear(void *_offset
, u64 val
)
3773 unsigned offset
= (long)_offset
;
3775 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3780 spin_lock(&kvm_lock
);
3781 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3783 vm_stat_clear_per_vm((void *)&stat_tmp
, 0);
3785 spin_unlock(&kvm_lock
);
3790 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
3792 static int vcpu_stat_get(void *_offset
, u64
*val
)
3794 unsigned offset
= (long)_offset
;
3796 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3800 spin_lock(&kvm_lock
);
3801 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3803 vcpu_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
3806 spin_unlock(&kvm_lock
);
3810 static int vcpu_stat_clear(void *_offset
, u64 val
)
3812 unsigned offset
= (long)_offset
;
3814 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3819 spin_lock(&kvm_lock
);
3820 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3822 vcpu_stat_clear_per_vm((void *)&stat_tmp
, 0);
3824 spin_unlock(&kvm_lock
);
3829 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
3832 static const struct file_operations
*stat_fops
[] = {
3833 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3834 [KVM_STAT_VM
] = &vm_stat_fops
,
3837 static int kvm_init_debug(void)
3840 struct kvm_stats_debugfs_item
*p
;
3842 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3843 if (kvm_debugfs_dir
== NULL
)
3846 kvm_debugfs_num_entries
= 0;
3847 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
3848 if (!debugfs_create_file(p
->name
, 0644, kvm_debugfs_dir
,
3849 (void *)(long)p
->offset
,
3850 stat_fops
[p
->kind
]))
3857 debugfs_remove_recursive(kvm_debugfs_dir
);
3862 static int kvm_suspend(void)
3864 if (kvm_usage_count
)
3865 hardware_disable_nolock(NULL
);
3869 static void kvm_resume(void)
3871 if (kvm_usage_count
) {
3872 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3873 hardware_enable_nolock(NULL
);
3877 static struct syscore_ops kvm_syscore_ops
= {
3878 .suspend
= kvm_suspend
,
3879 .resume
= kvm_resume
,
3883 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3885 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3888 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3890 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3892 if (vcpu
->preempted
)
3893 vcpu
->preempted
= false;
3895 kvm_arch_sched_in(vcpu
, cpu
);
3897 kvm_arch_vcpu_load(vcpu
, cpu
);
3900 static void kvm_sched_out(struct preempt_notifier
*pn
,
3901 struct task_struct
*next
)
3903 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3905 if (current
->state
== TASK_RUNNING
)
3906 vcpu
->preempted
= true;
3907 kvm_arch_vcpu_put(vcpu
);
3910 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3911 struct module
*module
)
3916 r
= kvm_arch_init(opaque
);
3921 * kvm_arch_init makes sure there's at most one caller
3922 * for architectures that support multiple implementations,
3923 * like intel and amd on x86.
3924 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3925 * conflicts in case kvm is already setup for another implementation.
3927 r
= kvm_irqfd_init();
3931 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3936 r
= kvm_arch_hardware_setup();
3940 for_each_online_cpu(cpu
) {
3941 smp_call_function_single(cpu
,
3942 kvm_arch_check_processor_compat
,
3948 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "AP_KVM_STARTING",
3949 kvm_starting_cpu
, kvm_dying_cpu
);
3952 register_reboot_notifier(&kvm_reboot_notifier
);
3954 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3956 vcpu_align
= __alignof__(struct kvm_vcpu
);
3957 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3959 if (!kvm_vcpu_cache
) {
3964 r
= kvm_async_pf_init();
3968 kvm_chardev_ops
.owner
= module
;
3969 kvm_vm_fops
.owner
= module
;
3970 kvm_vcpu_fops
.owner
= module
;
3972 r
= misc_register(&kvm_dev
);
3974 pr_err("kvm: misc device register failed\n");
3978 register_syscore_ops(&kvm_syscore_ops
);
3980 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3981 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3983 r
= kvm_init_debug();
3985 pr_err("kvm: create debugfs files failed\n");
3989 r
= kvm_vfio_ops_init();
3995 unregister_syscore_ops(&kvm_syscore_ops
);
3996 misc_deregister(&kvm_dev
);
3998 kvm_async_pf_deinit();
4000 kmem_cache_destroy(kvm_vcpu_cache
);
4002 unregister_reboot_notifier(&kvm_reboot_notifier
);
4003 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4006 kvm_arch_hardware_unsetup();
4008 free_cpumask_var(cpus_hardware_enabled
);
4016 EXPORT_SYMBOL_GPL(kvm_init
);
4020 debugfs_remove_recursive(kvm_debugfs_dir
);
4021 misc_deregister(&kvm_dev
);
4022 kmem_cache_destroy(kvm_vcpu_cache
);
4023 kvm_async_pf_deinit();
4024 unregister_syscore_ops(&kvm_syscore_ops
);
4025 unregister_reboot_notifier(&kvm_reboot_notifier
);
4026 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4027 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4028 kvm_arch_hardware_unsetup();
4031 free_cpumask_var(cpus_hardware_enabled
);
4032 kvm_vfio_ops_exit();
4034 EXPORT_SYMBOL_GPL(kvm_exit
);