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/signal.h>
36 #include <linux/sched/mm.h>
37 #include <linux/sched/stat.h>
38 #include <linux/cpumask.h>
39 #include <linux/smp.h>
40 #include <linux/anon_inodes.h>
41 #include <linux/profile.h>
42 #include <linux/kvm_para.h>
43 #include <linux/pagemap.h>
44 #include <linux/mman.h>
45 #include <linux/swap.h>
46 #include <linux/bitops.h>
47 #include <linux/spinlock.h>
48 #include <linux/compat.h>
49 #include <linux/srcu.h>
50 #include <linux/hugetlb.h>
51 #include <linux/slab.h>
52 #include <linux/sort.h>
53 #include <linux/bsearch.h>
55 #include <asm/processor.h>
57 #include <asm/ioctl.h>
58 #include <linux/uaccess.h>
59 #include <asm/pgtable.h>
61 #include "coalesced_mmio.h"
65 #define CREATE_TRACE_POINTS
66 #include <trace/events/kvm.h>
68 /* Worst case buffer size needed for holding an integer. */
69 #define ITOA_MAX_LEN 12
71 MODULE_AUTHOR("Qumranet");
72 MODULE_LICENSE("GPL");
74 /* Architectures should define their poll value according to the halt latency */
75 unsigned int halt_poll_ns
= KVM_HALT_POLL_NS_DEFAULT
;
76 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
77 EXPORT_SYMBOL_GPL(halt_poll_ns
);
79 /* Default doubles per-vcpu halt_poll_ns. */
80 unsigned int halt_poll_ns_grow
= 2;
81 module_param(halt_poll_ns_grow
, uint
, S_IRUGO
| S_IWUSR
);
82 EXPORT_SYMBOL_GPL(halt_poll_ns_grow
);
84 /* Default resets per-vcpu halt_poll_ns . */
85 unsigned int halt_poll_ns_shrink
;
86 module_param(halt_poll_ns_shrink
, uint
, S_IRUGO
| S_IWUSR
);
87 EXPORT_SYMBOL_GPL(halt_poll_ns_shrink
);
92 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
95 DEFINE_SPINLOCK(kvm_lock
);
96 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
99 static cpumask_var_t cpus_hardware_enabled
;
100 static int kvm_usage_count
;
101 static atomic_t hardware_enable_failed
;
103 struct kmem_cache
*kvm_vcpu_cache
;
104 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
106 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
108 struct dentry
*kvm_debugfs_dir
;
109 EXPORT_SYMBOL_GPL(kvm_debugfs_dir
);
111 static int kvm_debugfs_num_entries
;
112 static const struct file_operations
*stat_fops_per_vm
[];
114 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
116 #ifdef CONFIG_KVM_COMPAT
117 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
120 static int hardware_enable_all(void);
121 static void hardware_disable_all(void);
123 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
125 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
);
126 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
, gfn_t gfn
);
128 __visible
bool kvm_rebooting
;
129 EXPORT_SYMBOL_GPL(kvm_rebooting
);
131 static bool largepages_enabled
= true;
133 bool kvm_is_reserved_pfn(kvm_pfn_t pfn
)
136 return PageReserved(pfn_to_page(pfn
));
142 * Switches to specified vcpu, until a matching vcpu_put()
144 int vcpu_load(struct kvm_vcpu
*vcpu
)
148 if (mutex_lock_killable(&vcpu
->mutex
))
151 preempt_notifier_register(&vcpu
->preempt_notifier
);
152 kvm_arch_vcpu_load(vcpu
, cpu
);
156 EXPORT_SYMBOL_GPL(vcpu_load
);
158 void vcpu_put(struct kvm_vcpu
*vcpu
)
161 kvm_arch_vcpu_put(vcpu
);
162 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
164 mutex_unlock(&vcpu
->mutex
);
166 EXPORT_SYMBOL_GPL(vcpu_put
);
168 static void ack_flush(void *_completed
)
172 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
177 struct kvm_vcpu
*vcpu
;
179 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
182 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
183 kvm_make_request(req
, vcpu
);
186 /* Set ->requests bit before we read ->mode. */
187 smp_mb__after_atomic();
189 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
190 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
191 cpumask_set_cpu(cpu
, cpus
);
193 if (unlikely(cpus
== NULL
))
194 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
195 else if (!cpumask_empty(cpus
))
196 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
200 free_cpumask_var(cpus
);
204 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
205 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
208 * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
209 * kvm_make_all_cpus_request.
211 long dirty_count
= smp_load_acquire(&kvm
->tlbs_dirty
);
214 * We want to publish modifications to the page tables before reading
215 * mode. Pairs with a memory barrier in arch-specific code.
216 * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
217 * and smp_mb in walk_shadow_page_lockless_begin/end.
218 * - powerpc: smp_mb in kvmppc_prepare_to_enter.
220 * There is already an smp_mb__after_atomic() before
221 * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
224 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
225 ++kvm
->stat
.remote_tlb_flush
;
226 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
228 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
231 void kvm_reload_remote_mmus(struct kvm
*kvm
)
233 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
236 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
241 mutex_init(&vcpu
->mutex
);
246 init_swait_queue_head(&vcpu
->wq
);
247 kvm_async_pf_vcpu_init(vcpu
);
250 INIT_LIST_HEAD(&vcpu
->blocked_vcpu_list
);
252 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
257 vcpu
->run
= page_address(page
);
259 kvm_vcpu_set_in_spin_loop(vcpu
, false);
260 kvm_vcpu_set_dy_eligible(vcpu
, false);
261 vcpu
->preempted
= false;
263 r
= kvm_arch_vcpu_init(vcpu
);
269 free_page((unsigned long)vcpu
->run
);
273 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
275 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
278 kvm_arch_vcpu_uninit(vcpu
);
279 free_page((unsigned long)vcpu
->run
);
281 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
283 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
284 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
286 return container_of(mn
, struct kvm
, mmu_notifier
);
289 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
290 struct mm_struct
*mm
,
291 unsigned long address
)
293 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
294 int need_tlb_flush
, idx
;
297 * When ->invalidate_page runs, the linux pte has been zapped
298 * already but the page is still allocated until
299 * ->invalidate_page returns. So if we increase the sequence
300 * here the kvm page fault will notice if the spte can't be
301 * established because the page is going to be freed. If
302 * instead the kvm page fault establishes the spte before
303 * ->invalidate_page runs, kvm_unmap_hva will release it
306 * The sequence increase only need to be seen at spin_unlock
307 * time, and not at spin_lock time.
309 * Increasing the sequence after the spin_unlock would be
310 * unsafe because the kvm page fault could then establish the
311 * pte after kvm_unmap_hva returned, without noticing the page
312 * is going to be freed.
314 idx
= srcu_read_lock(&kvm
->srcu
);
315 spin_lock(&kvm
->mmu_lock
);
317 kvm
->mmu_notifier_seq
++;
318 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
319 /* we've to flush the tlb before the pages can be freed */
321 kvm_flush_remote_tlbs(kvm
);
323 spin_unlock(&kvm
->mmu_lock
);
325 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
327 srcu_read_unlock(&kvm
->srcu
, idx
);
330 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
331 struct mm_struct
*mm
,
332 unsigned long address
,
335 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
338 idx
= srcu_read_lock(&kvm
->srcu
);
339 spin_lock(&kvm
->mmu_lock
);
340 kvm
->mmu_notifier_seq
++;
341 kvm_set_spte_hva(kvm
, address
, pte
);
342 spin_unlock(&kvm
->mmu_lock
);
343 srcu_read_unlock(&kvm
->srcu
, idx
);
346 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
347 struct mm_struct
*mm
,
351 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
352 int need_tlb_flush
= 0, idx
;
354 idx
= srcu_read_lock(&kvm
->srcu
);
355 spin_lock(&kvm
->mmu_lock
);
357 * The count increase must become visible at unlock time as no
358 * spte can be established without taking the mmu_lock and
359 * count is also read inside the mmu_lock critical section.
361 kvm
->mmu_notifier_count
++;
362 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
363 need_tlb_flush
|= kvm
->tlbs_dirty
;
364 /* we've to flush the tlb before the pages can be freed */
366 kvm_flush_remote_tlbs(kvm
);
368 spin_unlock(&kvm
->mmu_lock
);
369 srcu_read_unlock(&kvm
->srcu
, idx
);
372 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
373 struct mm_struct
*mm
,
377 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
379 spin_lock(&kvm
->mmu_lock
);
381 * This sequence increase will notify the kvm page fault that
382 * the page that is going to be mapped in the spte could have
385 kvm
->mmu_notifier_seq
++;
388 * The above sequence increase must be visible before the
389 * below count decrease, which is ensured by the smp_wmb above
390 * in conjunction with the smp_rmb in mmu_notifier_retry().
392 kvm
->mmu_notifier_count
--;
393 spin_unlock(&kvm
->mmu_lock
);
395 BUG_ON(kvm
->mmu_notifier_count
< 0);
398 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
399 struct mm_struct
*mm
,
403 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
406 idx
= srcu_read_lock(&kvm
->srcu
);
407 spin_lock(&kvm
->mmu_lock
);
409 young
= kvm_age_hva(kvm
, start
, end
);
411 kvm_flush_remote_tlbs(kvm
);
413 spin_unlock(&kvm
->mmu_lock
);
414 srcu_read_unlock(&kvm
->srcu
, idx
);
419 static int kvm_mmu_notifier_clear_young(struct mmu_notifier
*mn
,
420 struct mm_struct
*mm
,
424 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
427 idx
= srcu_read_lock(&kvm
->srcu
);
428 spin_lock(&kvm
->mmu_lock
);
430 * Even though we do not flush TLB, this will still adversely
431 * affect performance on pre-Haswell Intel EPT, where there is
432 * no EPT Access Bit to clear so that we have to tear down EPT
433 * tables instead. If we find this unacceptable, we can always
434 * add a parameter to kvm_age_hva so that it effectively doesn't
435 * do anything on clear_young.
437 * Also note that currently we never issue secondary TLB flushes
438 * from clear_young, leaving this job up to the regular system
439 * cadence. If we find this inaccurate, we might come up with a
440 * more sophisticated heuristic later.
442 young
= kvm_age_hva(kvm
, start
, end
);
443 spin_unlock(&kvm
->mmu_lock
);
444 srcu_read_unlock(&kvm
->srcu
, idx
);
449 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
450 struct mm_struct
*mm
,
451 unsigned long address
)
453 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
456 idx
= srcu_read_lock(&kvm
->srcu
);
457 spin_lock(&kvm
->mmu_lock
);
458 young
= kvm_test_age_hva(kvm
, address
);
459 spin_unlock(&kvm
->mmu_lock
);
460 srcu_read_unlock(&kvm
->srcu
, idx
);
465 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
466 struct mm_struct
*mm
)
468 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
471 idx
= srcu_read_lock(&kvm
->srcu
);
472 kvm_arch_flush_shadow_all(kvm
);
473 srcu_read_unlock(&kvm
->srcu
, idx
);
476 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
477 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
478 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
479 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
480 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
481 .clear_young
= kvm_mmu_notifier_clear_young
,
482 .test_young
= kvm_mmu_notifier_test_young
,
483 .change_pte
= kvm_mmu_notifier_change_pte
,
484 .release
= kvm_mmu_notifier_release
,
487 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
489 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
490 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
493 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
495 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
500 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
502 static struct kvm_memslots
*kvm_alloc_memslots(void)
505 struct kvm_memslots
*slots
;
507 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
511 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
512 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
517 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
519 if (!memslot
->dirty_bitmap
)
522 kvfree(memslot
->dirty_bitmap
);
523 memslot
->dirty_bitmap
= NULL
;
527 * Free any memory in @free but not in @dont.
529 static void kvm_free_memslot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
530 struct kvm_memory_slot
*dont
)
532 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
533 kvm_destroy_dirty_bitmap(free
);
535 kvm_arch_free_memslot(kvm
, free
, dont
);
540 static void kvm_free_memslots(struct kvm
*kvm
, struct kvm_memslots
*slots
)
542 struct kvm_memory_slot
*memslot
;
547 kvm_for_each_memslot(memslot
, slots
)
548 kvm_free_memslot(kvm
, memslot
, NULL
);
553 static void kvm_destroy_vm_debugfs(struct kvm
*kvm
)
557 if (!kvm
->debugfs_dentry
)
560 debugfs_remove_recursive(kvm
->debugfs_dentry
);
562 if (kvm
->debugfs_stat_data
) {
563 for (i
= 0; i
< kvm_debugfs_num_entries
; i
++)
564 kfree(kvm
->debugfs_stat_data
[i
]);
565 kfree(kvm
->debugfs_stat_data
);
569 static int kvm_create_vm_debugfs(struct kvm
*kvm
, int fd
)
571 char dir_name
[ITOA_MAX_LEN
* 2];
572 struct kvm_stat_data
*stat_data
;
573 struct kvm_stats_debugfs_item
*p
;
575 if (!debugfs_initialized())
578 snprintf(dir_name
, sizeof(dir_name
), "%d-%d", task_pid_nr(current
), fd
);
579 kvm
->debugfs_dentry
= debugfs_create_dir(dir_name
,
581 if (!kvm
->debugfs_dentry
)
584 kvm
->debugfs_stat_data
= kcalloc(kvm_debugfs_num_entries
,
585 sizeof(*kvm
->debugfs_stat_data
),
587 if (!kvm
->debugfs_stat_data
)
590 for (p
= debugfs_entries
; p
->name
; p
++) {
591 stat_data
= kzalloc(sizeof(*stat_data
), GFP_KERNEL
);
595 stat_data
->kvm
= kvm
;
596 stat_data
->offset
= p
->offset
;
597 kvm
->debugfs_stat_data
[p
- debugfs_entries
] = stat_data
;
598 if (!debugfs_create_file(p
->name
, 0644,
601 stat_fops_per_vm
[p
->kind
]))
607 static struct kvm
*kvm_create_vm(unsigned long type
)
610 struct kvm
*kvm
= kvm_arch_alloc_vm();
613 return ERR_PTR(-ENOMEM
);
615 spin_lock_init(&kvm
->mmu_lock
);
617 kvm
->mm
= current
->mm
;
618 kvm_eventfd_init(kvm
);
619 mutex_init(&kvm
->lock
);
620 mutex_init(&kvm
->irq_lock
);
621 mutex_init(&kvm
->slots_lock
);
622 refcount_set(&kvm
->users_count
, 1);
623 INIT_LIST_HEAD(&kvm
->devices
);
625 r
= kvm_arch_init_vm(kvm
, type
);
627 goto out_err_no_disable
;
629 r
= hardware_enable_all();
631 goto out_err_no_disable
;
633 #ifdef CONFIG_HAVE_KVM_IRQFD
634 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
637 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
640 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++) {
641 struct kvm_memslots
*slots
= kvm_alloc_memslots();
643 goto out_err_no_srcu
;
645 * Generations must be different for each address space.
646 * Init kvm generation close to the maximum to easily test the
647 * code of handling generation number wrap-around.
649 slots
->generation
= i
* 2 - 150;
650 rcu_assign_pointer(kvm
->memslots
[i
], slots
);
653 if (init_srcu_struct(&kvm
->srcu
))
654 goto out_err_no_srcu
;
655 if (init_srcu_struct(&kvm
->irq_srcu
))
656 goto out_err_no_irq_srcu
;
657 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
658 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
664 r
= kvm_init_mmu_notifier(kvm
);
668 spin_lock(&kvm_lock
);
669 list_add(&kvm
->vm_list
, &vm_list
);
670 spin_unlock(&kvm_lock
);
672 preempt_notifier_inc();
677 cleanup_srcu_struct(&kvm
->irq_srcu
);
679 cleanup_srcu_struct(&kvm
->srcu
);
681 hardware_disable_all();
683 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
684 kfree(kvm
->buses
[i
]);
685 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
686 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
687 kvm_arch_free_vm(kvm
);
693 * Avoid using vmalloc for a small buffer.
694 * Should not be used when the size is statically known.
696 void *kvm_kvzalloc(unsigned long size
)
698 if (size
> PAGE_SIZE
)
699 return vzalloc(size
);
701 return kzalloc(size
, GFP_KERNEL
);
704 static void kvm_destroy_devices(struct kvm
*kvm
)
706 struct kvm_device
*dev
, *tmp
;
709 * We do not need to take the kvm->lock here, because nobody else
710 * has a reference to the struct kvm at this point and therefore
711 * cannot access the devices list anyhow.
713 list_for_each_entry_safe(dev
, tmp
, &kvm
->devices
, vm_node
) {
714 list_del(&dev
->vm_node
);
715 dev
->ops
->destroy(dev
);
719 static void kvm_destroy_vm(struct kvm
*kvm
)
722 struct mm_struct
*mm
= kvm
->mm
;
724 kvm_destroy_vm_debugfs(kvm
);
725 kvm_arch_sync_events(kvm
);
726 spin_lock(&kvm_lock
);
727 list_del(&kvm
->vm_list
);
728 spin_unlock(&kvm_lock
);
729 kvm_free_irq_routing(kvm
);
730 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
732 kvm_io_bus_destroy(kvm
->buses
[i
]);
733 kvm
->buses
[i
] = NULL
;
735 kvm_coalesced_mmio_free(kvm
);
736 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
737 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
739 kvm_arch_flush_shadow_all(kvm
);
741 kvm_arch_destroy_vm(kvm
);
742 kvm_destroy_devices(kvm
);
743 for (i
= 0; i
< KVM_ADDRESS_SPACE_NUM
; i
++)
744 kvm_free_memslots(kvm
, kvm
->memslots
[i
]);
745 cleanup_srcu_struct(&kvm
->irq_srcu
);
746 cleanup_srcu_struct(&kvm
->srcu
);
747 kvm_arch_free_vm(kvm
);
748 preempt_notifier_dec();
749 hardware_disable_all();
753 void kvm_get_kvm(struct kvm
*kvm
)
755 refcount_inc(&kvm
->users_count
);
757 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
759 void kvm_put_kvm(struct kvm
*kvm
)
761 if (refcount_dec_and_test(&kvm
->users_count
))
764 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
767 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
769 struct kvm
*kvm
= filp
->private_data
;
771 kvm_irqfd_release(kvm
);
778 * Allocation size is twice as large as the actual dirty bitmap size.
779 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
781 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
783 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
785 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
786 if (!memslot
->dirty_bitmap
)
793 * Insert memslot and re-sort memslots based on their GFN,
794 * so binary search could be used to lookup GFN.
795 * Sorting algorithm takes advantage of having initially
796 * sorted array and known changed memslot position.
798 static void update_memslots(struct kvm_memslots
*slots
,
799 struct kvm_memory_slot
*new)
802 int i
= slots
->id_to_index
[id
];
803 struct kvm_memory_slot
*mslots
= slots
->memslots
;
805 WARN_ON(mslots
[i
].id
!= id
);
807 WARN_ON(!mslots
[i
].npages
);
808 if (mslots
[i
].npages
)
811 if (!mslots
[i
].npages
)
815 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
816 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
817 if (!mslots
[i
+ 1].npages
)
819 mslots
[i
] = mslots
[i
+ 1];
820 slots
->id_to_index
[mslots
[i
].id
] = i
;
825 * The ">=" is needed when creating a slot with base_gfn == 0,
826 * so that it moves before all those with base_gfn == npages == 0.
828 * On the other hand, if new->npages is zero, the above loop has
829 * already left i pointing to the beginning of the empty part of
830 * mslots, and the ">=" would move the hole backwards in this
831 * case---which is wrong. So skip the loop when deleting a slot.
835 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
836 mslots
[i
] = mslots
[i
- 1];
837 slots
->id_to_index
[mslots
[i
].id
] = i
;
841 WARN_ON_ONCE(i
!= slots
->used_slots
);
844 slots
->id_to_index
[mslots
[i
].id
] = i
;
847 static int check_memory_region_flags(const struct kvm_userspace_memory_region
*mem
)
849 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
851 #ifdef __KVM_HAVE_READONLY_MEM
852 valid_flags
|= KVM_MEM_READONLY
;
855 if (mem
->flags
& ~valid_flags
)
861 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
862 int as_id
, struct kvm_memslots
*slots
)
864 struct kvm_memslots
*old_memslots
= __kvm_memslots(kvm
, as_id
);
867 * Set the low bit in the generation, which disables SPTE caching
868 * until the end of synchronize_srcu_expedited.
870 WARN_ON(old_memslots
->generation
& 1);
871 slots
->generation
= old_memslots
->generation
+ 1;
873 rcu_assign_pointer(kvm
->memslots
[as_id
], slots
);
874 synchronize_srcu_expedited(&kvm
->srcu
);
877 * Increment the new memslot generation a second time. This prevents
878 * vm exits that race with memslot updates from caching a memslot
879 * generation that will (potentially) be valid forever.
881 * Generations must be unique even across address spaces. We do not need
882 * a global counter for that, instead the generation space is evenly split
883 * across address spaces. For example, with two address spaces, address
884 * space 0 will use generations 0, 4, 8, ... while * address space 1 will
885 * use generations 2, 6, 10, 14, ...
887 slots
->generation
+= KVM_ADDRESS_SPACE_NUM
* 2 - 1;
889 kvm_arch_memslots_updated(kvm
, slots
);
895 * Allocate some memory and give it an address in the guest physical address
898 * Discontiguous memory is allowed, mostly for framebuffers.
900 * Must be called holding kvm->slots_lock for write.
902 int __kvm_set_memory_region(struct kvm
*kvm
,
903 const struct kvm_userspace_memory_region
*mem
)
907 unsigned long npages
;
908 struct kvm_memory_slot
*slot
;
909 struct kvm_memory_slot old
, new;
910 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
912 enum kvm_mr_change change
;
914 r
= check_memory_region_flags(mem
);
919 as_id
= mem
->slot
>> 16;
922 /* General sanity checks */
923 if (mem
->memory_size
& (PAGE_SIZE
- 1))
925 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
927 /* We can read the guest memory with __xxx_user() later on. */
928 if ((id
< KVM_USER_MEM_SLOTS
) &&
929 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
930 !access_ok(VERIFY_WRITE
,
931 (void __user
*)(unsigned long)mem
->userspace_addr
,
934 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_MEM_SLOTS_NUM
)
936 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
939 slot
= id_to_memslot(__kvm_memslots(kvm
, as_id
), id
);
940 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
941 npages
= mem
->memory_size
>> PAGE_SHIFT
;
943 if (npages
> KVM_MEM_MAX_NR_PAGES
)
949 new.base_gfn
= base_gfn
;
951 new.flags
= mem
->flags
;
955 change
= KVM_MR_CREATE
;
956 else { /* Modify an existing slot. */
957 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
958 (npages
!= old
.npages
) ||
959 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
962 if (base_gfn
!= old
.base_gfn
)
963 change
= KVM_MR_MOVE
;
964 else if (new.flags
!= old
.flags
)
965 change
= KVM_MR_FLAGS_ONLY
;
966 else { /* Nothing to change. */
975 change
= KVM_MR_DELETE
;
980 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
981 /* Check for overlaps */
983 kvm_for_each_memslot(slot
, __kvm_memslots(kvm
, as_id
)) {
984 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
987 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
988 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
993 /* Free page dirty bitmap if unneeded */
994 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
995 new.dirty_bitmap
= NULL
;
998 if (change
== KVM_MR_CREATE
) {
999 new.userspace_addr
= mem
->userspace_addr
;
1001 if (kvm_arch_create_memslot(kvm
, &new, npages
))
1005 /* Allocate page dirty bitmap if needed */
1006 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
1007 if (kvm_create_dirty_bitmap(&new) < 0)
1011 slots
= kvm_kvzalloc(sizeof(struct kvm_memslots
));
1014 memcpy(slots
, __kvm_memslots(kvm
, as_id
), sizeof(struct kvm_memslots
));
1016 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
1017 slot
= id_to_memslot(slots
, id
);
1018 slot
->flags
|= KVM_MEMSLOT_INVALID
;
1020 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1022 /* slot was deleted or moved, clear iommu mapping */
1023 kvm_iommu_unmap_pages(kvm
, &old
);
1024 /* From this point no new shadow pages pointing to a deleted,
1025 * or moved, memslot will be created.
1027 * validation of sp->gfn happens in:
1028 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1029 * - kvm_is_visible_gfn (mmu_check_roots)
1031 kvm_arch_flush_shadow_memslot(kvm
, slot
);
1034 * We can re-use the old_memslots from above, the only difference
1035 * from the currently installed memslots is the invalid flag. This
1036 * will get overwritten by update_memslots anyway.
1038 slots
= old_memslots
;
1041 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
1045 /* actual memory is freed via old in kvm_free_memslot below */
1046 if (change
== KVM_MR_DELETE
) {
1047 new.dirty_bitmap
= NULL
;
1048 memset(&new.arch
, 0, sizeof(new.arch
));
1051 update_memslots(slots
, &new);
1052 old_memslots
= install_new_memslots(kvm
, as_id
, slots
);
1054 kvm_arch_commit_memory_region(kvm
, mem
, &old
, &new, change
);
1056 kvm_free_memslot(kvm
, &old
, &new);
1057 kvfree(old_memslots
);
1060 * IOMMU mapping: New slots need to be mapped. Old slots need to be
1061 * un-mapped and re-mapped if their base changes. Since base change
1062 * unmapping is handled above with slot deletion, mapping alone is
1063 * needed here. Anything else the iommu might care about for existing
1064 * slots (size changes, userspace addr changes and read-only flag
1065 * changes) is disallowed above, so any other attribute changes getting
1066 * here can be skipped.
1068 if (as_id
== 0 && (change
== KVM_MR_CREATE
|| change
== KVM_MR_MOVE
)) {
1069 r
= kvm_iommu_map_pages(kvm
, &new);
1078 kvm_free_memslot(kvm
, &new, &old
);
1082 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
1084 int kvm_set_memory_region(struct kvm
*kvm
,
1085 const struct kvm_userspace_memory_region
*mem
)
1089 mutex_lock(&kvm
->slots_lock
);
1090 r
= __kvm_set_memory_region(kvm
, mem
);
1091 mutex_unlock(&kvm
->slots_lock
);
1094 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
1096 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
1097 struct kvm_userspace_memory_region
*mem
)
1099 if ((u16
)mem
->slot
>= KVM_USER_MEM_SLOTS
)
1102 return kvm_set_memory_region(kvm
, mem
);
1105 int kvm_get_dirty_log(struct kvm
*kvm
,
1106 struct kvm_dirty_log
*log
, int *is_dirty
)
1108 struct kvm_memslots
*slots
;
1109 struct kvm_memory_slot
*memslot
;
1112 unsigned long any
= 0;
1114 as_id
= log
->slot
>> 16;
1115 id
= (u16
)log
->slot
;
1116 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1119 slots
= __kvm_memslots(kvm
, as_id
);
1120 memslot
= id_to_memslot(slots
, id
);
1121 if (!memslot
->dirty_bitmap
)
1124 n
= kvm_dirty_bitmap_bytes(memslot
);
1126 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
1127 any
= memslot
->dirty_bitmap
[i
];
1129 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1136 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1138 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1140 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1141 * are dirty write protect them for next write.
1142 * @kvm: pointer to kvm instance
1143 * @log: slot id and address to which we copy the log
1144 * @is_dirty: flag set if any page is dirty
1146 * We need to keep it in mind that VCPU threads can write to the bitmap
1147 * concurrently. So, to avoid losing track of dirty pages we keep the
1150 * 1. Take a snapshot of the bit and clear it if needed.
1151 * 2. Write protect the corresponding page.
1152 * 3. Copy the snapshot to the userspace.
1153 * 4. Upon return caller flushes TLB's if needed.
1155 * Between 2 and 4, the guest may write to the page using the remaining TLB
1156 * entry. This is not a problem because the page is reported dirty using
1157 * the snapshot taken before and step 4 ensures that writes done after
1158 * exiting to userspace will be logged for the next call.
1161 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1162 struct kvm_dirty_log
*log
, bool *is_dirty
)
1164 struct kvm_memslots
*slots
;
1165 struct kvm_memory_slot
*memslot
;
1168 unsigned long *dirty_bitmap
;
1169 unsigned long *dirty_bitmap_buffer
;
1171 as_id
= log
->slot
>> 16;
1172 id
= (u16
)log
->slot
;
1173 if (as_id
>= KVM_ADDRESS_SPACE_NUM
|| id
>= KVM_USER_MEM_SLOTS
)
1176 slots
= __kvm_memslots(kvm
, as_id
);
1177 memslot
= id_to_memslot(slots
, id
);
1179 dirty_bitmap
= memslot
->dirty_bitmap
;
1183 n
= kvm_dirty_bitmap_bytes(memslot
);
1185 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1186 memset(dirty_bitmap_buffer
, 0, n
);
1188 spin_lock(&kvm
->mmu_lock
);
1190 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1194 if (!dirty_bitmap
[i
])
1199 mask
= xchg(&dirty_bitmap
[i
], 0);
1200 dirty_bitmap_buffer
[i
] = mask
;
1203 offset
= i
* BITS_PER_LONG
;
1204 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1209 spin_unlock(&kvm
->mmu_lock
);
1210 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_HWPOISON
;
1424 flags
|= FOLL_WRITE
;
1426 npages
= get_user_pages_unlocked(addr
, 1, page
, flags
);
1431 /* map read fault as writable if possible */
1432 if (unlikely(!write_fault
) && writable
) {
1433 struct page
*wpage
[1];
1435 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1444 *pfn
= page_to_pfn(page
[0]);
1448 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1450 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1453 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1459 static int hva_to_pfn_remapped(struct vm_area_struct
*vma
,
1460 unsigned long addr
, bool *async
,
1461 bool write_fault
, kvm_pfn_t
*p_pfn
)
1466 r
= follow_pfn(vma
, addr
, &pfn
);
1469 * get_user_pages fails for VM_IO and VM_PFNMAP vmas and does
1470 * not call the fault handler, so do it here.
1472 bool unlocked
= false;
1473 r
= fixup_user_fault(current
, current
->mm
, addr
,
1474 (write_fault
? FAULT_FLAG_WRITE
: 0),
1481 r
= follow_pfn(vma
, addr
, &pfn
);
1489 * Get a reference here because callers of *hva_to_pfn* and
1490 * *gfn_to_pfn* ultimately call kvm_release_pfn_clean on the
1491 * returned pfn. This is only needed if the VMA has VM_MIXEDMAP
1492 * set, but the kvm_get_pfn/kvm_release_pfn_clean pair will
1493 * simply do nothing for reserved pfns.
1495 * Whoever called remap_pfn_range is also going to call e.g.
1496 * unmap_mapping_range before the underlying pages are freed,
1497 * causing a call to our MMU notifier.
1506 * Pin guest page in memory and return its pfn.
1507 * @addr: host virtual address which maps memory to the guest
1508 * @atomic: whether this function can sleep
1509 * @async: whether this function need to wait IO complete if the
1510 * host page is not in the memory
1511 * @write_fault: whether we should get a writable host page
1512 * @writable: whether it allows to map a writable host page for !@write_fault
1514 * The function will map a writable host page for these two cases:
1515 * 1): @write_fault = true
1516 * 2): @write_fault = false && @writable, @writable will tell the caller
1517 * whether the mapping is writable.
1519 static kvm_pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1520 bool write_fault
, bool *writable
)
1522 struct vm_area_struct
*vma
;
1526 /* we can do it either atomically or asynchronously, not both */
1527 BUG_ON(atomic
&& async
);
1529 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1533 return KVM_PFN_ERR_FAULT
;
1535 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1539 down_read(¤t
->mm
->mmap_sem
);
1540 if (npages
== -EHWPOISON
||
1541 (!async
&& check_user_page_hwpoison(addr
))) {
1542 pfn
= KVM_PFN_ERR_HWPOISON
;
1547 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1550 pfn
= KVM_PFN_ERR_FAULT
;
1551 else if (vma
->vm_flags
& (VM_IO
| VM_PFNMAP
)) {
1552 r
= hva_to_pfn_remapped(vma
, addr
, async
, write_fault
, &pfn
);
1556 pfn
= KVM_PFN_ERR_FAULT
;
1558 if (async
&& vma_is_valid(vma
, write_fault
))
1560 pfn
= KVM_PFN_ERR_FAULT
;
1563 up_read(¤t
->mm
->mmap_sem
);
1567 kvm_pfn_t
__gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1568 bool atomic
, bool *async
, bool write_fault
,
1571 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1573 if (addr
== KVM_HVA_ERR_RO_BAD
) {
1576 return KVM_PFN_ERR_RO_FAULT
;
1579 if (kvm_is_error_hva(addr
)) {
1582 return KVM_PFN_NOSLOT
;
1585 /* Do not map writable pfn in the readonly memslot. */
1586 if (writable
&& memslot_is_readonly(slot
)) {
1591 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1594 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot
);
1596 kvm_pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1599 return __gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
, false, NULL
,
1600 write_fault
, writable
);
1602 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1604 kvm_pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1606 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1608 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot
);
1610 kvm_pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1612 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1614 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1616 kvm_pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1618 return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm
, gfn
), gfn
);
1620 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1622 kvm_pfn_t
kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1624 return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1626 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic
);
1628 kvm_pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1630 return gfn_to_pfn_memslot(gfn_to_memslot(kvm
, gfn
), gfn
);
1632 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1634 kvm_pfn_t
kvm_vcpu_gfn_to_pfn(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1636 return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu
, gfn
), gfn
);
1638 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn
);
1640 int gfn_to_page_many_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1641 struct page
**pages
, int nr_pages
)
1646 addr
= gfn_to_hva_many(slot
, gfn
, &entry
);
1647 if (kvm_is_error_hva(addr
))
1650 if (entry
< nr_pages
)
1653 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1655 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1657 static struct page
*kvm_pfn_to_page(kvm_pfn_t pfn
)
1659 if (is_error_noslot_pfn(pfn
))
1660 return KVM_ERR_PTR_BAD_PAGE
;
1662 if (kvm_is_reserved_pfn(pfn
)) {
1664 return KVM_ERR_PTR_BAD_PAGE
;
1667 return pfn_to_page(pfn
);
1670 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1674 pfn
= gfn_to_pfn(kvm
, gfn
);
1676 return kvm_pfn_to_page(pfn
);
1678 EXPORT_SYMBOL_GPL(gfn_to_page
);
1680 struct page
*kvm_vcpu_gfn_to_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
1684 pfn
= kvm_vcpu_gfn_to_pfn(vcpu
, gfn
);
1686 return kvm_pfn_to_page(pfn
);
1688 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page
);
1690 void kvm_release_page_clean(struct page
*page
)
1692 WARN_ON(is_error_page(page
));
1694 kvm_release_pfn_clean(page_to_pfn(page
));
1696 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1698 void kvm_release_pfn_clean(kvm_pfn_t pfn
)
1700 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1701 put_page(pfn_to_page(pfn
));
1703 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1705 void kvm_release_page_dirty(struct page
*page
)
1707 WARN_ON(is_error_page(page
));
1709 kvm_release_pfn_dirty(page_to_pfn(page
));
1711 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1713 static void kvm_release_pfn_dirty(kvm_pfn_t pfn
)
1715 kvm_set_pfn_dirty(pfn
);
1716 kvm_release_pfn_clean(pfn
);
1719 void kvm_set_pfn_dirty(kvm_pfn_t pfn
)
1721 if (!kvm_is_reserved_pfn(pfn
)) {
1722 struct page
*page
= pfn_to_page(pfn
);
1724 if (!PageReserved(page
))
1728 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1730 void kvm_set_pfn_accessed(kvm_pfn_t pfn
)
1732 if (!kvm_is_reserved_pfn(pfn
))
1733 mark_page_accessed(pfn_to_page(pfn
));
1735 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1737 void kvm_get_pfn(kvm_pfn_t pfn
)
1739 if (!kvm_is_reserved_pfn(pfn
))
1740 get_page(pfn_to_page(pfn
));
1742 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1744 static int next_segment(unsigned long len
, int offset
)
1746 if (len
> PAGE_SIZE
- offset
)
1747 return PAGE_SIZE
- offset
;
1752 static int __kvm_read_guest_page(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1753 void *data
, int offset
, int len
)
1758 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1759 if (kvm_is_error_hva(addr
))
1761 r
= __copy_from_user(data
, (void __user
*)addr
+ offset
, len
);
1767 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1770 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1772 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1774 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1776 int kvm_vcpu_read_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
, void *data
,
1777 int offset
, int len
)
1779 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1781 return __kvm_read_guest_page(slot
, gfn
, data
, offset
, len
);
1783 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page
);
1785 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1787 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1789 int offset
= offset_in_page(gpa
);
1792 while ((seg
= next_segment(len
, offset
)) != 0) {
1793 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1803 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1805 int kvm_vcpu_read_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, void *data
, unsigned long len
)
1807 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1809 int offset
= offset_in_page(gpa
);
1812 while ((seg
= next_segment(len
, offset
)) != 0) {
1813 ret
= kvm_vcpu_read_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1823 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest
);
1825 static int __kvm_read_guest_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1826 void *data
, int offset
, unsigned long len
)
1831 addr
= gfn_to_hva_memslot_prot(slot
, gfn
, NULL
);
1832 if (kvm_is_error_hva(addr
))
1834 pagefault_disable();
1835 r
= __copy_from_user_inatomic(data
, (void __user
*)addr
+ offset
, len
);
1842 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1845 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1846 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1847 int offset
= offset_in_page(gpa
);
1849 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1851 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic
);
1853 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1854 void *data
, unsigned long len
)
1856 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1857 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1858 int offset
= offset_in_page(gpa
);
1860 return __kvm_read_guest_atomic(slot
, gfn
, data
, offset
, len
);
1862 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic
);
1864 static int __kvm_write_guest_page(struct kvm_memory_slot
*memslot
, gfn_t gfn
,
1865 const void *data
, int offset
, int len
)
1870 addr
= gfn_to_hva_memslot(memslot
, gfn
);
1871 if (kvm_is_error_hva(addr
))
1873 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1876 mark_page_dirty_in_slot(memslot
, gfn
);
1880 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
,
1881 const void *data
, int offset
, int len
)
1883 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1885 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1887 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1889 int kvm_vcpu_write_guest_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
,
1890 const void *data
, int offset
, int len
)
1892 struct kvm_memory_slot
*slot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
1894 return __kvm_write_guest_page(slot
, gfn
, data
, offset
, len
);
1896 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page
);
1898 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1901 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1903 int offset
= offset_in_page(gpa
);
1906 while ((seg
= next_segment(len
, offset
)) != 0) {
1907 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1917 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1919 int kvm_vcpu_write_guest(struct kvm_vcpu
*vcpu
, gpa_t gpa
, const void *data
,
1922 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1924 int offset
= offset_in_page(gpa
);
1927 while ((seg
= next_segment(len
, offset
)) != 0) {
1928 ret
= kvm_vcpu_write_guest_page(vcpu
, gfn
, data
, offset
, seg
);
1938 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest
);
1940 static int __kvm_gfn_to_hva_cache_init(struct kvm_memslots
*slots
,
1941 struct gfn_to_hva_cache
*ghc
,
1942 gpa_t gpa
, unsigned long len
)
1944 int offset
= offset_in_page(gpa
);
1945 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1946 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1947 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1948 gfn_t nr_pages_avail
;
1951 ghc
->generation
= slots
->generation
;
1953 ghc
->memslot
= __gfn_to_memslot(slots
, start_gfn
);
1954 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, NULL
);
1955 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_needed
<= 1) {
1959 * If the requested region crosses two memslots, we still
1960 * verify that the entire region is valid here.
1962 while (start_gfn
<= end_gfn
) {
1963 ghc
->memslot
= __gfn_to_memslot(slots
, start_gfn
);
1964 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1966 if (kvm_is_error_hva(ghc
->hva
))
1968 start_gfn
+= nr_pages_avail
;
1970 /* Use the slow path for cross page reads and writes. */
1971 ghc
->memslot
= NULL
;
1976 int kvm_vcpu_gfn_to_hva_cache_init(struct kvm_vcpu
*vcpu
, struct gfn_to_hva_cache
*ghc
,
1977 gpa_t gpa
, unsigned long len
)
1979 struct kvm_memslots
*slots
= kvm_vcpu_memslots(vcpu
);
1980 return __kvm_gfn_to_hva_cache_init(slots
, ghc
, gpa
, len
);
1982 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva_cache_init
);
1984 int kvm_vcpu_write_guest_offset_cached(struct kvm_vcpu
*vcpu
, struct gfn_to_hva_cache
*ghc
,
1985 void *data
, int offset
, unsigned long len
)
1987 struct kvm_memslots
*slots
= kvm_vcpu_memslots(vcpu
);
1989 gpa_t gpa
= ghc
->gpa
+ offset
;
1991 BUG_ON(len
+ offset
> ghc
->len
);
1993 if (slots
->generation
!= ghc
->generation
)
1994 __kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
);
1996 if (unlikely(!ghc
->memslot
))
1997 return kvm_vcpu_write_guest(vcpu
, gpa
, data
, len
);
1999 if (kvm_is_error_hva(ghc
->hva
))
2002 r
= __copy_to_user((void __user
*)ghc
->hva
+ offset
, data
, len
);
2005 mark_page_dirty_in_slot(ghc
->memslot
, gpa
>> PAGE_SHIFT
);
2009 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_offset_cached
);
2011 int kvm_vcpu_write_guest_cached(struct kvm_vcpu
*vcpu
, struct gfn_to_hva_cache
*ghc
,
2012 void *data
, unsigned long len
)
2014 return kvm_vcpu_write_guest_offset_cached(vcpu
, ghc
, data
, 0, len
);
2016 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_cached
);
2018 int kvm_vcpu_read_guest_cached(struct kvm_vcpu
*vcpu
, struct gfn_to_hva_cache
*ghc
,
2019 void *data
, unsigned long len
)
2021 struct kvm_memslots
*slots
= kvm_vcpu_memslots(vcpu
);
2024 BUG_ON(len
> ghc
->len
);
2026 if (slots
->generation
!= ghc
->generation
)
2027 __kvm_gfn_to_hva_cache_init(slots
, ghc
, ghc
->gpa
, ghc
->len
);
2029 if (unlikely(!ghc
->memslot
))
2030 return kvm_vcpu_read_guest(vcpu
, ghc
->gpa
, data
, len
);
2032 if (kvm_is_error_hva(ghc
->hva
))
2035 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
2041 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_cached
);
2043 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
2045 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
2047 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
2049 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
2051 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
2053 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
2055 int offset
= offset_in_page(gpa
);
2058 while ((seg
= next_segment(len
, offset
)) != 0) {
2059 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
2068 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
2070 static void mark_page_dirty_in_slot(struct kvm_memory_slot
*memslot
,
2073 if (memslot
&& memslot
->dirty_bitmap
) {
2074 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
2076 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
2080 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
2082 struct kvm_memory_slot
*memslot
;
2084 memslot
= gfn_to_memslot(kvm
, gfn
);
2085 mark_page_dirty_in_slot(memslot
, gfn
);
2087 EXPORT_SYMBOL_GPL(mark_page_dirty
);
2089 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
2091 struct kvm_memory_slot
*memslot
;
2093 memslot
= kvm_vcpu_gfn_to_memslot(vcpu
, gfn
);
2094 mark_page_dirty_in_slot(memslot
, gfn
);
2096 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty
);
2098 static void grow_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2100 unsigned int old
, val
, grow
;
2102 old
= val
= vcpu
->halt_poll_ns
;
2103 grow
= READ_ONCE(halt_poll_ns_grow
);
2105 if (val
== 0 && grow
)
2110 if (val
> halt_poll_ns
)
2113 vcpu
->halt_poll_ns
= val
;
2114 trace_kvm_halt_poll_ns_grow(vcpu
->vcpu_id
, val
, old
);
2117 static void shrink_halt_poll_ns(struct kvm_vcpu
*vcpu
)
2119 unsigned int old
, val
, shrink
;
2121 old
= val
= vcpu
->halt_poll_ns
;
2122 shrink
= READ_ONCE(halt_poll_ns_shrink
);
2128 vcpu
->halt_poll_ns
= val
;
2129 trace_kvm_halt_poll_ns_shrink(vcpu
->vcpu_id
, val
, old
);
2132 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
2134 if (kvm_arch_vcpu_runnable(vcpu
)) {
2135 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
2138 if (kvm_cpu_has_pending_timer(vcpu
))
2140 if (signal_pending(current
))
2147 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2149 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
2152 DECLARE_SWAITQUEUE(wait
);
2153 bool waited
= false;
2156 start
= cur
= ktime_get();
2157 if (vcpu
->halt_poll_ns
) {
2158 ktime_t stop
= ktime_add_ns(ktime_get(), vcpu
->halt_poll_ns
);
2160 ++vcpu
->stat
.halt_attempted_poll
;
2163 * This sets KVM_REQ_UNHALT if an interrupt
2166 if (kvm_vcpu_check_block(vcpu
) < 0) {
2167 ++vcpu
->stat
.halt_successful_poll
;
2168 if (!vcpu_valid_wakeup(vcpu
))
2169 ++vcpu
->stat
.halt_poll_invalid
;
2173 } while (single_task_running() && ktime_before(cur
, stop
));
2176 kvm_arch_vcpu_blocking(vcpu
);
2179 prepare_to_swait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
2181 if (kvm_vcpu_check_block(vcpu
) < 0)
2188 finish_swait(&vcpu
->wq
, &wait
);
2191 kvm_arch_vcpu_unblocking(vcpu
);
2193 block_ns
= ktime_to_ns(cur
) - ktime_to_ns(start
);
2195 if (!vcpu_valid_wakeup(vcpu
))
2196 shrink_halt_poll_ns(vcpu
);
2197 else if (halt_poll_ns
) {
2198 if (block_ns
<= vcpu
->halt_poll_ns
)
2200 /* we had a long block, shrink polling */
2201 else if (vcpu
->halt_poll_ns
&& block_ns
> halt_poll_ns
)
2202 shrink_halt_poll_ns(vcpu
);
2203 /* we had a short halt and our poll time is too small */
2204 else if (vcpu
->halt_poll_ns
< halt_poll_ns
&&
2205 block_ns
< halt_poll_ns
)
2206 grow_halt_poll_ns(vcpu
);
2208 vcpu
->halt_poll_ns
= 0;
2210 trace_kvm_vcpu_wakeup(block_ns
, waited
, vcpu_valid_wakeup(vcpu
));
2211 kvm_arch_vcpu_block_finish(vcpu
);
2213 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
2216 void kvm_vcpu_wake_up(struct kvm_vcpu
*vcpu
)
2218 struct swait_queue_head
*wqp
;
2220 wqp
= kvm_arch_vcpu_wq(vcpu
);
2221 if (swait_active(wqp
)) {
2223 ++vcpu
->stat
.halt_wakeup
;
2227 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up
);
2230 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2232 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
2235 int cpu
= vcpu
->cpu
;
2237 kvm_vcpu_wake_up(vcpu
);
2239 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
2240 if (kvm_arch_vcpu_should_kick(vcpu
))
2241 smp_send_reschedule(cpu
);
2244 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
2245 #endif /* !CONFIG_S390 */
2247 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
2250 struct task_struct
*task
= NULL
;
2254 pid
= rcu_dereference(target
->pid
);
2256 task
= get_pid_task(pid
, PIDTYPE_PID
);
2260 ret
= yield_to(task
, 1);
2261 put_task_struct(task
);
2265 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
2268 * Helper that checks whether a VCPU is eligible for directed yield.
2269 * Most eligible candidate to yield is decided by following heuristics:
2271 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2272 * (preempted lock holder), indicated by @in_spin_loop.
2273 * Set at the beiginning and cleared at the end of interception/PLE handler.
2275 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2276 * chance last time (mostly it has become eligible now since we have probably
2277 * yielded to lockholder in last iteration. This is done by toggling
2278 * @dy_eligible each time a VCPU checked for eligibility.)
2280 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2281 * to preempted lock-holder could result in wrong VCPU selection and CPU
2282 * burning. Giving priority for a potential lock-holder increases lock
2285 * Since algorithm is based on heuristics, accessing another VCPU data without
2286 * locking does not harm. It may result in trying to yield to same VCPU, fail
2287 * and continue with next VCPU and so on.
2289 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
2291 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2294 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
2295 vcpu
->spin_loop
.dy_eligible
;
2297 if (vcpu
->spin_loop
.in_spin_loop
)
2298 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
2306 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
2308 struct kvm
*kvm
= me
->kvm
;
2309 struct kvm_vcpu
*vcpu
;
2310 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
2316 kvm_vcpu_set_in_spin_loop(me
, true);
2318 * We boost the priority of a VCPU that is runnable but not
2319 * currently running, because it got preempted by something
2320 * else and called schedule in __vcpu_run. Hopefully that
2321 * VCPU is holding the lock that we need and will release it.
2322 * We approximate round-robin by starting at the last boosted VCPU.
2324 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
2325 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
2326 if (!pass
&& i
<= last_boosted_vcpu
) {
2327 i
= last_boosted_vcpu
;
2329 } else if (pass
&& i
> last_boosted_vcpu
)
2331 if (!ACCESS_ONCE(vcpu
->preempted
))
2335 if (swait_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
2337 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
2340 yielded
= kvm_vcpu_yield_to(vcpu
);
2342 kvm
->last_boosted_vcpu
= i
;
2344 } else if (yielded
< 0) {
2351 kvm_vcpu_set_in_spin_loop(me
, false);
2353 /* Ensure vcpu is not eligible during next spinloop */
2354 kvm_vcpu_set_dy_eligible(me
, false);
2356 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
2358 static int kvm_vcpu_fault(struct vm_fault
*vmf
)
2360 struct kvm_vcpu
*vcpu
= vmf
->vma
->vm_file
->private_data
;
2363 if (vmf
->pgoff
== 0)
2364 page
= virt_to_page(vcpu
->run
);
2366 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
2367 page
= virt_to_page(vcpu
->arch
.pio_data
);
2369 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2370 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
2371 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
2374 return kvm_arch_vcpu_fault(vcpu
, vmf
);
2380 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
2381 .fault
= kvm_vcpu_fault
,
2384 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
2386 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2390 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2392 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2394 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2395 kvm_put_kvm(vcpu
->kvm
);
2399 static struct file_operations kvm_vcpu_fops
= {
2400 .release
= kvm_vcpu_release
,
2401 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2402 #ifdef CONFIG_KVM_COMPAT
2403 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2405 .mmap
= kvm_vcpu_mmap
,
2406 .llseek
= noop_llseek
,
2410 * Allocates an inode for the vcpu.
2412 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2414 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2417 static int kvm_create_vcpu_debugfs(struct kvm_vcpu
*vcpu
)
2419 char dir_name
[ITOA_MAX_LEN
* 2];
2422 if (!kvm_arch_has_vcpu_debugfs())
2425 if (!debugfs_initialized())
2428 snprintf(dir_name
, sizeof(dir_name
), "vcpu%d", vcpu
->vcpu_id
);
2429 vcpu
->debugfs_dentry
= debugfs_create_dir(dir_name
,
2430 vcpu
->kvm
->debugfs_dentry
);
2431 if (!vcpu
->debugfs_dentry
)
2434 ret
= kvm_arch_create_vcpu_debugfs(vcpu
);
2436 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2444 * Creates some virtual cpus. Good luck creating more than one.
2446 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2449 struct kvm_vcpu
*vcpu
;
2451 if (id
>= KVM_MAX_VCPU_ID
)
2454 mutex_lock(&kvm
->lock
);
2455 if (kvm
->created_vcpus
== KVM_MAX_VCPUS
) {
2456 mutex_unlock(&kvm
->lock
);
2460 kvm
->created_vcpus
++;
2461 mutex_unlock(&kvm
->lock
);
2463 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2466 goto vcpu_decrement
;
2469 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2471 r
= kvm_arch_vcpu_setup(vcpu
);
2475 r
= kvm_create_vcpu_debugfs(vcpu
);
2479 mutex_lock(&kvm
->lock
);
2480 if (kvm_get_vcpu_by_id(kvm
, id
)) {
2482 goto unlock_vcpu_destroy
;
2485 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2487 /* Now it's all set up, let userspace reach it */
2489 r
= create_vcpu_fd(vcpu
);
2492 goto unlock_vcpu_destroy
;
2495 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2498 * Pairs with smp_rmb() in kvm_get_vcpu. Write kvm->vcpus
2499 * before kvm->online_vcpu's incremented value.
2502 atomic_inc(&kvm
->online_vcpus
);
2504 mutex_unlock(&kvm
->lock
);
2505 kvm_arch_vcpu_postcreate(vcpu
);
2508 unlock_vcpu_destroy
:
2509 mutex_unlock(&kvm
->lock
);
2510 debugfs_remove_recursive(vcpu
->debugfs_dentry
);
2512 kvm_arch_vcpu_destroy(vcpu
);
2514 mutex_lock(&kvm
->lock
);
2515 kvm
->created_vcpus
--;
2516 mutex_unlock(&kvm
->lock
);
2520 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2523 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2524 vcpu
->sigset_active
= 1;
2525 vcpu
->sigset
= *sigset
;
2527 vcpu
->sigset_active
= 0;
2531 static long kvm_vcpu_ioctl(struct file
*filp
,
2532 unsigned int ioctl
, unsigned long arg
)
2534 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2535 void __user
*argp
= (void __user
*)arg
;
2537 struct kvm_fpu
*fpu
= NULL
;
2538 struct kvm_sregs
*kvm_sregs
= NULL
;
2540 if (vcpu
->kvm
->mm
!= current
->mm
)
2543 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2546 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2548 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2549 * so vcpu_load() would break it.
2551 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2552 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2556 r
= vcpu_load(vcpu
);
2564 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2565 /* The thread running this VCPU changed. */
2566 struct pid
*oldpid
= vcpu
->pid
;
2567 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2569 rcu_assign_pointer(vcpu
->pid
, newpid
);
2574 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2575 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2577 case KVM_GET_REGS
: {
2578 struct kvm_regs
*kvm_regs
;
2581 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2584 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2588 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2595 case KVM_SET_REGS
: {
2596 struct kvm_regs
*kvm_regs
;
2599 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2600 if (IS_ERR(kvm_regs
)) {
2601 r
= PTR_ERR(kvm_regs
);
2604 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2608 case KVM_GET_SREGS
: {
2609 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2613 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2617 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2622 case KVM_SET_SREGS
: {
2623 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2624 if (IS_ERR(kvm_sregs
)) {
2625 r
= PTR_ERR(kvm_sregs
);
2629 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2632 case KVM_GET_MP_STATE
: {
2633 struct kvm_mp_state mp_state
;
2635 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2639 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2644 case KVM_SET_MP_STATE
: {
2645 struct kvm_mp_state mp_state
;
2648 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2650 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2653 case KVM_TRANSLATE
: {
2654 struct kvm_translation tr
;
2657 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2659 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2663 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2668 case KVM_SET_GUEST_DEBUG
: {
2669 struct kvm_guest_debug dbg
;
2672 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2674 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2677 case KVM_SET_SIGNAL_MASK
: {
2678 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2679 struct kvm_signal_mask kvm_sigmask
;
2680 sigset_t sigset
, *p
;
2685 if (copy_from_user(&kvm_sigmask
, argp
,
2686 sizeof(kvm_sigmask
)))
2689 if (kvm_sigmask
.len
!= sizeof(sigset
))
2692 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2697 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2701 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2705 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2709 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2715 fpu
= memdup_user(argp
, sizeof(*fpu
));
2721 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2725 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2734 #ifdef CONFIG_KVM_COMPAT
2735 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2736 unsigned int ioctl
, unsigned long arg
)
2738 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2739 void __user
*argp
= compat_ptr(arg
);
2742 if (vcpu
->kvm
->mm
!= current
->mm
)
2746 case KVM_SET_SIGNAL_MASK
: {
2747 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2748 struct kvm_signal_mask kvm_sigmask
;
2749 compat_sigset_t csigset
;
2754 if (copy_from_user(&kvm_sigmask
, argp
,
2755 sizeof(kvm_sigmask
)))
2758 if (kvm_sigmask
.len
!= sizeof(csigset
))
2761 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2764 sigset_from_compat(&sigset
, &csigset
);
2765 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2767 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2771 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2779 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2780 int (*accessor
)(struct kvm_device
*dev
,
2781 struct kvm_device_attr
*attr
),
2784 struct kvm_device_attr attr
;
2789 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2792 return accessor(dev
, &attr
);
2795 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2798 struct kvm_device
*dev
= filp
->private_data
;
2801 case KVM_SET_DEVICE_ATTR
:
2802 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2803 case KVM_GET_DEVICE_ATTR
:
2804 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2805 case KVM_HAS_DEVICE_ATTR
:
2806 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2808 if (dev
->ops
->ioctl
)
2809 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2815 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2817 struct kvm_device
*dev
= filp
->private_data
;
2818 struct kvm
*kvm
= dev
->kvm
;
2824 static const struct file_operations kvm_device_fops
= {
2825 .unlocked_ioctl
= kvm_device_ioctl
,
2826 #ifdef CONFIG_KVM_COMPAT
2827 .compat_ioctl
= kvm_device_ioctl
,
2829 .release
= kvm_device_release
,
2832 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2834 if (filp
->f_op
!= &kvm_device_fops
)
2837 return filp
->private_data
;
2840 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2841 #ifdef CONFIG_KVM_MPIC
2842 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2843 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2846 #ifdef CONFIG_KVM_XICS
2847 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2851 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2853 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2856 if (kvm_device_ops_table
[type
] != NULL
)
2859 kvm_device_ops_table
[type
] = ops
;
2863 void kvm_unregister_device_ops(u32 type
)
2865 if (kvm_device_ops_table
[type
] != NULL
)
2866 kvm_device_ops_table
[type
] = NULL
;
2869 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2870 struct kvm_create_device
*cd
)
2872 struct kvm_device_ops
*ops
= NULL
;
2873 struct kvm_device
*dev
;
2874 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2877 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2880 ops
= kvm_device_ops_table
[cd
->type
];
2887 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2894 mutex_lock(&kvm
->lock
);
2895 ret
= ops
->create(dev
, cd
->type
);
2897 mutex_unlock(&kvm
->lock
);
2901 list_add(&dev
->vm_node
, &kvm
->devices
);
2902 mutex_unlock(&kvm
->lock
);
2907 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2909 mutex_lock(&kvm
->lock
);
2910 list_del(&dev
->vm_node
);
2911 mutex_unlock(&kvm
->lock
);
2921 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2924 case KVM_CAP_USER_MEMORY
:
2925 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2926 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2927 case KVM_CAP_INTERNAL_ERROR_DATA
:
2928 #ifdef CONFIG_HAVE_KVM_MSI
2929 case KVM_CAP_SIGNAL_MSI
:
2931 #ifdef CONFIG_HAVE_KVM_IRQFD
2933 case KVM_CAP_IRQFD_RESAMPLE
:
2935 case KVM_CAP_IOEVENTFD_ANY_LENGTH
:
2936 case KVM_CAP_CHECK_EXTENSION_VM
:
2938 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2939 case KVM_CAP_IRQ_ROUTING
:
2940 return KVM_MAX_IRQ_ROUTES
;
2942 #if KVM_ADDRESS_SPACE_NUM > 1
2943 case KVM_CAP_MULTI_ADDRESS_SPACE
:
2944 return KVM_ADDRESS_SPACE_NUM
;
2946 case KVM_CAP_MAX_VCPU_ID
:
2947 return KVM_MAX_VCPU_ID
;
2951 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2954 static long kvm_vm_ioctl(struct file
*filp
,
2955 unsigned int ioctl
, unsigned long arg
)
2957 struct kvm
*kvm
= filp
->private_data
;
2958 void __user
*argp
= (void __user
*)arg
;
2961 if (kvm
->mm
!= current
->mm
)
2964 case KVM_CREATE_VCPU
:
2965 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2967 case KVM_SET_USER_MEMORY_REGION
: {
2968 struct kvm_userspace_memory_region kvm_userspace_mem
;
2971 if (copy_from_user(&kvm_userspace_mem
, argp
,
2972 sizeof(kvm_userspace_mem
)))
2975 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2978 case KVM_GET_DIRTY_LOG
: {
2979 struct kvm_dirty_log log
;
2982 if (copy_from_user(&log
, argp
, sizeof(log
)))
2984 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2987 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2988 case KVM_REGISTER_COALESCED_MMIO
: {
2989 struct kvm_coalesced_mmio_zone zone
;
2992 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2994 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2997 case KVM_UNREGISTER_COALESCED_MMIO
: {
2998 struct kvm_coalesced_mmio_zone zone
;
3001 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
3003 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
3008 struct kvm_irqfd data
;
3011 if (copy_from_user(&data
, argp
, sizeof(data
)))
3013 r
= kvm_irqfd(kvm
, &data
);
3016 case KVM_IOEVENTFD
: {
3017 struct kvm_ioeventfd data
;
3020 if (copy_from_user(&data
, argp
, sizeof(data
)))
3022 r
= kvm_ioeventfd(kvm
, &data
);
3025 #ifdef CONFIG_HAVE_KVM_MSI
3026 case KVM_SIGNAL_MSI
: {
3030 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
3032 r
= kvm_send_userspace_msi(kvm
, &msi
);
3036 #ifdef __KVM_HAVE_IRQ_LINE
3037 case KVM_IRQ_LINE_STATUS
:
3038 case KVM_IRQ_LINE
: {
3039 struct kvm_irq_level irq_event
;
3042 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
3045 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
3046 ioctl
== KVM_IRQ_LINE_STATUS
);
3051 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
3052 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
3060 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
3061 case KVM_SET_GSI_ROUTING
: {
3062 struct kvm_irq_routing routing
;
3063 struct kvm_irq_routing __user
*urouting
;
3064 struct kvm_irq_routing_entry
*entries
= NULL
;
3067 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
3070 if (routing
.nr
> KVM_MAX_IRQ_ROUTES
)
3076 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
3081 if (copy_from_user(entries
, urouting
->entries
,
3082 routing
.nr
* sizeof(*entries
)))
3083 goto out_free_irq_routing
;
3085 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
3087 out_free_irq_routing
:
3091 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
3092 case KVM_CREATE_DEVICE
: {
3093 struct kvm_create_device cd
;
3096 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
3099 r
= kvm_ioctl_create_device(kvm
, &cd
);
3104 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
3110 case KVM_CHECK_EXTENSION
:
3111 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
3114 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
3120 #ifdef CONFIG_KVM_COMPAT
3121 struct compat_kvm_dirty_log
{
3125 compat_uptr_t dirty_bitmap
; /* one bit per page */
3130 static long kvm_vm_compat_ioctl(struct file
*filp
,
3131 unsigned int ioctl
, unsigned long arg
)
3133 struct kvm
*kvm
= filp
->private_data
;
3136 if (kvm
->mm
!= current
->mm
)
3139 case KVM_GET_DIRTY_LOG
: {
3140 struct compat_kvm_dirty_log compat_log
;
3141 struct kvm_dirty_log log
;
3143 if (copy_from_user(&compat_log
, (void __user
*)arg
,
3144 sizeof(compat_log
)))
3146 log
.slot
= compat_log
.slot
;
3147 log
.padding1
= compat_log
.padding1
;
3148 log
.padding2
= compat_log
.padding2
;
3149 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
3151 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
3155 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
3161 static struct file_operations kvm_vm_fops
= {
3162 .release
= kvm_vm_release
,
3163 .unlocked_ioctl
= kvm_vm_ioctl
,
3164 #ifdef CONFIG_KVM_COMPAT
3165 .compat_ioctl
= kvm_vm_compat_ioctl
,
3167 .llseek
= noop_llseek
,
3170 static int kvm_dev_ioctl_create_vm(unsigned long type
)
3176 kvm
= kvm_create_vm(type
);
3178 return PTR_ERR(kvm
);
3179 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3180 r
= kvm_coalesced_mmio_init(kvm
);
3186 r
= get_unused_fd_flags(O_CLOEXEC
);
3191 file
= anon_inode_getfile("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
);
3195 return PTR_ERR(file
);
3198 if (kvm_create_vm_debugfs(kvm
, r
) < 0) {
3204 fd_install(r
, file
);
3208 static long kvm_dev_ioctl(struct file
*filp
,
3209 unsigned int ioctl
, unsigned long arg
)
3214 case KVM_GET_API_VERSION
:
3217 r
= KVM_API_VERSION
;
3220 r
= kvm_dev_ioctl_create_vm(arg
);
3222 case KVM_CHECK_EXTENSION
:
3223 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
3225 case KVM_GET_VCPU_MMAP_SIZE
:
3228 r
= PAGE_SIZE
; /* struct kvm_run */
3230 r
+= PAGE_SIZE
; /* pio data page */
3232 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3233 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
3236 case KVM_TRACE_ENABLE
:
3237 case KVM_TRACE_PAUSE
:
3238 case KVM_TRACE_DISABLE
:
3242 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
3248 static struct file_operations kvm_chardev_ops
= {
3249 .unlocked_ioctl
= kvm_dev_ioctl
,
3250 .compat_ioctl
= kvm_dev_ioctl
,
3251 .llseek
= noop_llseek
,
3254 static struct miscdevice kvm_dev
= {
3260 static void hardware_enable_nolock(void *junk
)
3262 int cpu
= raw_smp_processor_id();
3265 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3268 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
3270 r
= kvm_arch_hardware_enable();
3273 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3274 atomic_inc(&hardware_enable_failed
);
3275 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
3279 static int kvm_starting_cpu(unsigned int cpu
)
3281 raw_spin_lock(&kvm_count_lock
);
3282 if (kvm_usage_count
)
3283 hardware_enable_nolock(NULL
);
3284 raw_spin_unlock(&kvm_count_lock
);
3288 static void hardware_disable_nolock(void *junk
)
3290 int cpu
= raw_smp_processor_id();
3292 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
3294 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
3295 kvm_arch_hardware_disable();
3298 static int kvm_dying_cpu(unsigned int cpu
)
3300 raw_spin_lock(&kvm_count_lock
);
3301 if (kvm_usage_count
)
3302 hardware_disable_nolock(NULL
);
3303 raw_spin_unlock(&kvm_count_lock
);
3307 static void hardware_disable_all_nolock(void)
3309 BUG_ON(!kvm_usage_count
);
3312 if (!kvm_usage_count
)
3313 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3316 static void hardware_disable_all(void)
3318 raw_spin_lock(&kvm_count_lock
);
3319 hardware_disable_all_nolock();
3320 raw_spin_unlock(&kvm_count_lock
);
3323 static int hardware_enable_all(void)
3327 raw_spin_lock(&kvm_count_lock
);
3330 if (kvm_usage_count
== 1) {
3331 atomic_set(&hardware_enable_failed
, 0);
3332 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
3334 if (atomic_read(&hardware_enable_failed
)) {
3335 hardware_disable_all_nolock();
3340 raw_spin_unlock(&kvm_count_lock
);
3345 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
3349 * Some (well, at least mine) BIOSes hang on reboot if
3352 * And Intel TXT required VMX off for all cpu when system shutdown.
3354 pr_info("kvm: exiting hardware virtualization\n");
3355 kvm_rebooting
= true;
3356 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3360 static struct notifier_block kvm_reboot_notifier
= {
3361 .notifier_call
= kvm_reboot
,
3365 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
3369 for (i
= 0; i
< bus
->dev_count
; i
++) {
3370 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
3372 kvm_iodevice_destructor(pos
);
3377 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
3378 const struct kvm_io_range
*r2
)
3380 gpa_t addr1
= r1
->addr
;
3381 gpa_t addr2
= r2
->addr
;
3386 /* If r2->len == 0, match the exact address. If r2->len != 0,
3387 * accept any overlapping write. Any order is acceptable for
3388 * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3389 * we process all of them.
3402 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
3404 return kvm_io_bus_cmp(p1
, p2
);
3407 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
3408 gpa_t addr
, int len
)
3410 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
3416 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
3417 kvm_io_bus_sort_cmp
, NULL
);
3422 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
3423 gpa_t addr
, int len
)
3425 struct kvm_io_range
*range
, key
;
3428 key
= (struct kvm_io_range
) {
3433 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
3434 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
3438 off
= range
- bus
->range
;
3440 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3446 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3447 struct kvm_io_range
*range
, const void *val
)
3451 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3455 while (idx
< bus
->dev_count
&&
3456 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3457 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3466 /* kvm_io_bus_write - called under kvm->slots_lock */
3467 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3468 int len
, const void *val
)
3470 struct kvm_io_bus
*bus
;
3471 struct kvm_io_range range
;
3474 range
= (struct kvm_io_range
) {
3479 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3482 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3483 return r
< 0 ? r
: 0;
3486 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3487 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3488 gpa_t addr
, int len
, const void *val
, long cookie
)
3490 struct kvm_io_bus
*bus
;
3491 struct kvm_io_range range
;
3493 range
= (struct kvm_io_range
) {
3498 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3502 /* First try the device referenced by cookie. */
3503 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3504 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3505 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3510 * cookie contained garbage; fall back to search and return the
3511 * correct cookie value.
3513 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3516 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3517 struct kvm_io_range
*range
, void *val
)
3521 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3525 while (idx
< bus
->dev_count
&&
3526 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3527 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3535 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3537 /* kvm_io_bus_read - called under kvm->slots_lock */
3538 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3541 struct kvm_io_bus
*bus
;
3542 struct kvm_io_range range
;
3545 range
= (struct kvm_io_range
) {
3550 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3553 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3554 return r
< 0 ? r
: 0;
3558 /* Caller must hold slots_lock. */
3559 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3560 int len
, struct kvm_io_device
*dev
)
3562 struct kvm_io_bus
*new_bus
, *bus
;
3564 bus
= kvm
->buses
[bus_idx
];
3568 /* exclude ioeventfd which is limited by maximum fd */
3569 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3572 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3573 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3576 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3577 sizeof(struct kvm_io_range
)));
3578 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3579 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3580 synchronize_srcu_expedited(&kvm
->srcu
);
3586 /* Caller must hold slots_lock. */
3587 void kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3588 struct kvm_io_device
*dev
)
3591 struct kvm_io_bus
*new_bus
, *bus
;
3593 bus
= kvm
->buses
[bus_idx
];
3597 for (i
= 0; i
< bus
->dev_count
; i
++)
3598 if (bus
->range
[i
].dev
== dev
) {
3602 if (i
== bus
->dev_count
)
3605 new_bus
= kmalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3606 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3608 pr_err("kvm: failed to shrink bus, removing it completely\n");
3612 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3613 new_bus
->dev_count
--;
3614 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3615 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3618 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3619 synchronize_srcu_expedited(&kvm
->srcu
);
3624 struct kvm_io_device
*kvm_io_bus_get_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3627 struct kvm_io_bus
*bus
;
3628 int dev_idx
, srcu_idx
;
3629 struct kvm_io_device
*iodev
= NULL
;
3631 srcu_idx
= srcu_read_lock(&kvm
->srcu
);
3633 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
3637 dev_idx
= kvm_io_bus_get_first_dev(bus
, addr
, 1);
3641 iodev
= bus
->range
[dev_idx
].dev
;
3644 srcu_read_unlock(&kvm
->srcu
, srcu_idx
);
3648 EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev
);
3650 static int kvm_debugfs_open(struct inode
*inode
, struct file
*file
,
3651 int (*get
)(void *, u64
*), int (*set
)(void *, u64
),
3654 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3657 /* The debugfs files are a reference to the kvm struct which
3658 * is still valid when kvm_destroy_vm is called.
3659 * To avoid the race between open and the removal of the debugfs
3660 * directory we test against the users count.
3662 if (!refcount_inc_not_zero(&stat_data
->kvm
->users_count
))
3665 if (simple_attr_open(inode
, file
, get
, set
, fmt
)) {
3666 kvm_put_kvm(stat_data
->kvm
);
3673 static int kvm_debugfs_release(struct inode
*inode
, struct file
*file
)
3675 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)
3678 simple_attr_release(inode
, file
);
3679 kvm_put_kvm(stat_data
->kvm
);
3684 static int vm_stat_get_per_vm(void *data
, u64
*val
)
3686 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3688 *val
= *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
);
3693 static int vm_stat_clear_per_vm(void *data
, u64 val
)
3695 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3700 *(ulong
*)((void *)stat_data
->kvm
+ stat_data
->offset
) = 0;
3705 static int vm_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3707 __simple_attr_check_format("%llu\n", 0ull);
3708 return kvm_debugfs_open(inode
, file
, vm_stat_get_per_vm
,
3709 vm_stat_clear_per_vm
, "%llu\n");
3712 static const struct file_operations vm_stat_get_per_vm_fops
= {
3713 .owner
= THIS_MODULE
,
3714 .open
= vm_stat_get_per_vm_open
,
3715 .release
= kvm_debugfs_release
,
3716 .read
= simple_attr_read
,
3717 .write
= simple_attr_write
,
3718 .llseek
= generic_file_llseek
,
3721 static int vcpu_stat_get_per_vm(void *data
, u64
*val
)
3724 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3725 struct kvm_vcpu
*vcpu
;
3729 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3730 *val
+= *(u64
*)((void *)vcpu
+ stat_data
->offset
);
3735 static int vcpu_stat_clear_per_vm(void *data
, u64 val
)
3738 struct kvm_stat_data
*stat_data
= (struct kvm_stat_data
*)data
;
3739 struct kvm_vcpu
*vcpu
;
3744 kvm_for_each_vcpu(i
, vcpu
, stat_data
->kvm
)
3745 *(u64
*)((void *)vcpu
+ stat_data
->offset
) = 0;
3750 static int vcpu_stat_get_per_vm_open(struct inode
*inode
, struct file
*file
)
3752 __simple_attr_check_format("%llu\n", 0ull);
3753 return kvm_debugfs_open(inode
, file
, vcpu_stat_get_per_vm
,
3754 vcpu_stat_clear_per_vm
, "%llu\n");
3757 static const struct file_operations vcpu_stat_get_per_vm_fops
= {
3758 .owner
= THIS_MODULE
,
3759 .open
= vcpu_stat_get_per_vm_open
,
3760 .release
= kvm_debugfs_release
,
3761 .read
= simple_attr_read
,
3762 .write
= simple_attr_write
,
3763 .llseek
= generic_file_llseek
,
3766 static const struct file_operations
*stat_fops_per_vm
[] = {
3767 [KVM_STAT_VCPU
] = &vcpu_stat_get_per_vm_fops
,
3768 [KVM_STAT_VM
] = &vm_stat_get_per_vm_fops
,
3771 static int vm_stat_get(void *_offset
, u64
*val
)
3773 unsigned offset
= (long)_offset
;
3775 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3779 spin_lock(&kvm_lock
);
3780 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3782 vm_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
3785 spin_unlock(&kvm_lock
);
3789 static int vm_stat_clear(void *_offset
, u64 val
)
3791 unsigned offset
= (long)_offset
;
3793 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3798 spin_lock(&kvm_lock
);
3799 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3801 vm_stat_clear_per_vm((void *)&stat_tmp
, 0);
3803 spin_unlock(&kvm_lock
);
3808 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, vm_stat_clear
, "%llu\n");
3810 static int vcpu_stat_get(void *_offset
, u64
*val
)
3812 unsigned offset
= (long)_offset
;
3814 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3818 spin_lock(&kvm_lock
);
3819 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3821 vcpu_stat_get_per_vm((void *)&stat_tmp
, &tmp_val
);
3824 spin_unlock(&kvm_lock
);
3828 static int vcpu_stat_clear(void *_offset
, u64 val
)
3830 unsigned offset
= (long)_offset
;
3832 struct kvm_stat_data stat_tmp
= {.offset
= offset
};
3837 spin_lock(&kvm_lock
);
3838 list_for_each_entry(kvm
, &vm_list
, vm_list
) {
3840 vcpu_stat_clear_per_vm((void *)&stat_tmp
, 0);
3842 spin_unlock(&kvm_lock
);
3847 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, vcpu_stat_clear
,
3850 static const struct file_operations
*stat_fops
[] = {
3851 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3852 [KVM_STAT_VM
] = &vm_stat_fops
,
3855 static int kvm_init_debug(void)
3858 struct kvm_stats_debugfs_item
*p
;
3860 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3861 if (kvm_debugfs_dir
== NULL
)
3864 kvm_debugfs_num_entries
= 0;
3865 for (p
= debugfs_entries
; p
->name
; ++p
, kvm_debugfs_num_entries
++) {
3866 if (!debugfs_create_file(p
->name
, 0644, kvm_debugfs_dir
,
3867 (void *)(long)p
->offset
,
3868 stat_fops
[p
->kind
]))
3875 debugfs_remove_recursive(kvm_debugfs_dir
);
3880 static int kvm_suspend(void)
3882 if (kvm_usage_count
)
3883 hardware_disable_nolock(NULL
);
3887 static void kvm_resume(void)
3889 if (kvm_usage_count
) {
3890 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3891 hardware_enable_nolock(NULL
);
3895 static struct syscore_ops kvm_syscore_ops
= {
3896 .suspend
= kvm_suspend
,
3897 .resume
= kvm_resume
,
3901 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3903 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3906 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3908 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3910 if (vcpu
->preempted
)
3911 vcpu
->preempted
= false;
3913 kvm_arch_sched_in(vcpu
, cpu
);
3915 kvm_arch_vcpu_load(vcpu
, cpu
);
3918 static void kvm_sched_out(struct preempt_notifier
*pn
,
3919 struct task_struct
*next
)
3921 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3923 if (current
->state
== TASK_RUNNING
)
3924 vcpu
->preempted
= true;
3925 kvm_arch_vcpu_put(vcpu
);
3928 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3929 struct module
*module
)
3934 r
= kvm_arch_init(opaque
);
3939 * kvm_arch_init makes sure there's at most one caller
3940 * for architectures that support multiple implementations,
3941 * like intel and amd on x86.
3942 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3943 * conflicts in case kvm is already setup for another implementation.
3945 r
= kvm_irqfd_init();
3949 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3954 r
= kvm_arch_hardware_setup();
3958 for_each_online_cpu(cpu
) {
3959 smp_call_function_single(cpu
,
3960 kvm_arch_check_processor_compat
,
3966 r
= cpuhp_setup_state_nocalls(CPUHP_AP_KVM_STARTING
, "kvm/cpu:starting",
3967 kvm_starting_cpu
, kvm_dying_cpu
);
3970 register_reboot_notifier(&kvm_reboot_notifier
);
3972 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3974 vcpu_align
= __alignof__(struct kvm_vcpu
);
3975 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3977 if (!kvm_vcpu_cache
) {
3982 r
= kvm_async_pf_init();
3986 kvm_chardev_ops
.owner
= module
;
3987 kvm_vm_fops
.owner
= module
;
3988 kvm_vcpu_fops
.owner
= module
;
3990 r
= misc_register(&kvm_dev
);
3992 pr_err("kvm: misc device register failed\n");
3996 register_syscore_ops(&kvm_syscore_ops
);
3998 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3999 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
4001 r
= kvm_init_debug();
4003 pr_err("kvm: create debugfs files failed\n");
4007 r
= kvm_vfio_ops_init();
4013 unregister_syscore_ops(&kvm_syscore_ops
);
4014 misc_deregister(&kvm_dev
);
4016 kvm_async_pf_deinit();
4018 kmem_cache_destroy(kvm_vcpu_cache
);
4020 unregister_reboot_notifier(&kvm_reboot_notifier
);
4021 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4024 kvm_arch_hardware_unsetup();
4026 free_cpumask_var(cpus_hardware_enabled
);
4034 EXPORT_SYMBOL_GPL(kvm_init
);
4038 debugfs_remove_recursive(kvm_debugfs_dir
);
4039 misc_deregister(&kvm_dev
);
4040 kmem_cache_destroy(kvm_vcpu_cache
);
4041 kvm_async_pf_deinit();
4042 unregister_syscore_ops(&kvm_syscore_ops
);
4043 unregister_reboot_notifier(&kvm_reboot_notifier
);
4044 cpuhp_remove_state_nocalls(CPUHP_AP_KVM_STARTING
);
4045 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
4046 kvm_arch_hardware_unsetup();
4049 free_cpumask_var(cpus_hardware_enabled
);
4050 kvm_vfio_ops_exit();
4052 EXPORT_SYMBOL_GPL(kvm_exit
);