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 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 static unsigned int halt_poll_ns
;
70 module_param(halt_poll_ns
, uint
, S_IRUGO
| S_IWUSR
);
75 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
78 DEFINE_SPINLOCK(kvm_lock
);
79 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
82 static cpumask_var_t cpus_hardware_enabled
;
83 static int kvm_usage_count
;
84 static atomic_t hardware_enable_failed
;
86 struct kmem_cache
*kvm_vcpu_cache
;
87 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
89 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
91 struct dentry
*kvm_debugfs_dir
;
93 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
95 #ifdef CONFIG_KVM_COMPAT
96 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
99 static int hardware_enable_all(void);
100 static void hardware_disable_all(void);
102 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
104 static void kvm_release_pfn_dirty(pfn_t pfn
);
105 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
106 struct kvm_memory_slot
*memslot
, gfn_t gfn
);
108 __visible
bool kvm_rebooting
;
109 EXPORT_SYMBOL_GPL(kvm_rebooting
);
111 static bool largepages_enabled
= true;
113 bool kvm_is_reserved_pfn(pfn_t pfn
)
116 return PageReserved(pfn_to_page(pfn
));
122 * Switches to specified vcpu, until a matching vcpu_put()
124 int vcpu_load(struct kvm_vcpu
*vcpu
)
128 if (mutex_lock_killable(&vcpu
->mutex
))
131 preempt_notifier_register(&vcpu
->preempt_notifier
);
132 kvm_arch_vcpu_load(vcpu
, cpu
);
137 void vcpu_put(struct kvm_vcpu
*vcpu
)
140 kvm_arch_vcpu_put(vcpu
);
141 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
143 mutex_unlock(&vcpu
->mutex
);
146 static void ack_flush(void *_completed
)
150 bool kvm_make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
155 struct kvm_vcpu
*vcpu
;
157 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
160 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
161 kvm_make_request(req
, vcpu
);
164 /* Set ->requests bit before we read ->mode */
167 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
168 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
169 cpumask_set_cpu(cpu
, cpus
);
171 if (unlikely(cpus
== NULL
))
172 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
173 else if (!cpumask_empty(cpus
))
174 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
178 free_cpumask_var(cpus
);
182 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
183 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
185 long dirty_count
= kvm
->tlbs_dirty
;
188 if (kvm_make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
189 ++kvm
->stat
.remote_tlb_flush
;
190 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
192 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
195 void kvm_reload_remote_mmus(struct kvm
*kvm
)
197 kvm_make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
200 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
202 kvm_make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
205 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
207 kvm_make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
210 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
215 mutex_init(&vcpu
->mutex
);
220 init_waitqueue_head(&vcpu
->wq
);
221 kvm_async_pf_vcpu_init(vcpu
);
223 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
228 vcpu
->run
= page_address(page
);
230 kvm_vcpu_set_in_spin_loop(vcpu
, false);
231 kvm_vcpu_set_dy_eligible(vcpu
, false);
232 vcpu
->preempted
= false;
234 r
= kvm_arch_vcpu_init(vcpu
);
240 free_page((unsigned long)vcpu
->run
);
244 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
246 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
249 kvm_arch_vcpu_uninit(vcpu
);
250 free_page((unsigned long)vcpu
->run
);
252 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
254 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
255 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
257 return container_of(mn
, struct kvm
, mmu_notifier
);
260 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
261 struct mm_struct
*mm
,
262 unsigned long address
)
264 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
265 int need_tlb_flush
, idx
;
268 * When ->invalidate_page runs, the linux pte has been zapped
269 * already but the page is still allocated until
270 * ->invalidate_page returns. So if we increase the sequence
271 * here the kvm page fault will notice if the spte can't be
272 * established because the page is going to be freed. If
273 * instead the kvm page fault establishes the spte before
274 * ->invalidate_page runs, kvm_unmap_hva will release it
277 * The sequence increase only need to be seen at spin_unlock
278 * time, and not at spin_lock time.
280 * Increasing the sequence after the spin_unlock would be
281 * unsafe because the kvm page fault could then establish the
282 * pte after kvm_unmap_hva returned, without noticing the page
283 * is going to be freed.
285 idx
= srcu_read_lock(&kvm
->srcu
);
286 spin_lock(&kvm
->mmu_lock
);
288 kvm
->mmu_notifier_seq
++;
289 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
290 /* we've to flush the tlb before the pages can be freed */
292 kvm_flush_remote_tlbs(kvm
);
294 spin_unlock(&kvm
->mmu_lock
);
296 kvm_arch_mmu_notifier_invalidate_page(kvm
, address
);
298 srcu_read_unlock(&kvm
->srcu
, idx
);
301 static void kvm_mmu_notifier_change_pte(struct mmu_notifier
*mn
,
302 struct mm_struct
*mm
,
303 unsigned long address
,
306 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
309 idx
= srcu_read_lock(&kvm
->srcu
);
310 spin_lock(&kvm
->mmu_lock
);
311 kvm
->mmu_notifier_seq
++;
312 kvm_set_spte_hva(kvm
, address
, pte
);
313 spin_unlock(&kvm
->mmu_lock
);
314 srcu_read_unlock(&kvm
->srcu
, idx
);
317 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier
*mn
,
318 struct mm_struct
*mm
,
322 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
323 int need_tlb_flush
= 0, idx
;
325 idx
= srcu_read_lock(&kvm
->srcu
);
326 spin_lock(&kvm
->mmu_lock
);
328 * The count increase must become visible at unlock time as no
329 * spte can be established without taking the mmu_lock and
330 * count is also read inside the mmu_lock critical section.
332 kvm
->mmu_notifier_count
++;
333 need_tlb_flush
= kvm_unmap_hva_range(kvm
, start
, end
);
334 need_tlb_flush
|= kvm
->tlbs_dirty
;
335 /* we've to flush the tlb before the pages can be freed */
337 kvm_flush_remote_tlbs(kvm
);
339 spin_unlock(&kvm
->mmu_lock
);
340 srcu_read_unlock(&kvm
->srcu
, idx
);
343 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier
*mn
,
344 struct mm_struct
*mm
,
348 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
350 spin_lock(&kvm
->mmu_lock
);
352 * This sequence increase will notify the kvm page fault that
353 * the page that is going to be mapped in the spte could have
356 kvm
->mmu_notifier_seq
++;
359 * The above sequence increase must be visible before the
360 * below count decrease, which is ensured by the smp_wmb above
361 * in conjunction with the smp_rmb in mmu_notifier_retry().
363 kvm
->mmu_notifier_count
--;
364 spin_unlock(&kvm
->mmu_lock
);
366 BUG_ON(kvm
->mmu_notifier_count
< 0);
369 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier
*mn
,
370 struct mm_struct
*mm
,
374 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
377 idx
= srcu_read_lock(&kvm
->srcu
);
378 spin_lock(&kvm
->mmu_lock
);
380 young
= kvm_age_hva(kvm
, start
, end
);
382 kvm_flush_remote_tlbs(kvm
);
384 spin_unlock(&kvm
->mmu_lock
);
385 srcu_read_unlock(&kvm
->srcu
, idx
);
390 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
391 struct mm_struct
*mm
,
392 unsigned long address
)
394 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
397 idx
= srcu_read_lock(&kvm
->srcu
);
398 spin_lock(&kvm
->mmu_lock
);
399 young
= kvm_test_age_hva(kvm
, address
);
400 spin_unlock(&kvm
->mmu_lock
);
401 srcu_read_unlock(&kvm
->srcu
, idx
);
406 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
407 struct mm_struct
*mm
)
409 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
412 idx
= srcu_read_lock(&kvm
->srcu
);
413 kvm_arch_flush_shadow_all(kvm
);
414 srcu_read_unlock(&kvm
->srcu
, idx
);
417 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
418 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
419 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
420 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
421 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
422 .test_young
= kvm_mmu_notifier_test_young
,
423 .change_pte
= kvm_mmu_notifier_change_pte
,
424 .release
= kvm_mmu_notifier_release
,
427 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
429 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
430 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
433 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
435 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
440 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
442 static void kvm_init_memslots_id(struct kvm
*kvm
)
445 struct kvm_memslots
*slots
= kvm
->memslots
;
447 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
448 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
451 static struct kvm
*kvm_create_vm(unsigned long type
)
454 struct kvm
*kvm
= kvm_arch_alloc_vm();
457 return ERR_PTR(-ENOMEM
);
459 r
= kvm_arch_init_vm(kvm
, type
);
461 goto out_err_no_disable
;
463 r
= hardware_enable_all();
465 goto out_err_no_disable
;
467 #ifdef CONFIG_HAVE_KVM_IRQFD
468 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
471 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
474 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
476 goto out_err_no_srcu
;
479 * Init kvm generation close to the maximum to easily test the
480 * code of handling generation number wrap-around.
482 kvm
->memslots
->generation
= -150;
484 kvm_init_memslots_id(kvm
);
485 if (init_srcu_struct(&kvm
->srcu
))
486 goto out_err_no_srcu
;
487 if (init_srcu_struct(&kvm
->irq_srcu
))
488 goto out_err_no_irq_srcu
;
489 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
490 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
496 spin_lock_init(&kvm
->mmu_lock
);
497 kvm
->mm
= current
->mm
;
498 atomic_inc(&kvm
->mm
->mm_count
);
499 kvm_eventfd_init(kvm
);
500 mutex_init(&kvm
->lock
);
501 mutex_init(&kvm
->irq_lock
);
502 mutex_init(&kvm
->slots_lock
);
503 atomic_set(&kvm
->users_count
, 1);
504 INIT_LIST_HEAD(&kvm
->devices
);
506 r
= kvm_init_mmu_notifier(kvm
);
510 spin_lock(&kvm_lock
);
511 list_add(&kvm
->vm_list
, &vm_list
);
512 spin_unlock(&kvm_lock
);
517 cleanup_srcu_struct(&kvm
->irq_srcu
);
519 cleanup_srcu_struct(&kvm
->srcu
);
521 hardware_disable_all();
523 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
524 kfree(kvm
->buses
[i
]);
525 kfree(kvm
->memslots
);
526 kvm_arch_free_vm(kvm
);
531 * Avoid using vmalloc for a small buffer.
532 * Should not be used when the size is statically known.
534 void *kvm_kvzalloc(unsigned long size
)
536 if (size
> PAGE_SIZE
)
537 return vzalloc(size
);
539 return kzalloc(size
, GFP_KERNEL
);
542 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
544 if (!memslot
->dirty_bitmap
)
547 kvfree(memslot
->dirty_bitmap
);
548 memslot
->dirty_bitmap
= NULL
;
552 * Free any memory in @free but not in @dont.
554 static void kvm_free_physmem_slot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
555 struct kvm_memory_slot
*dont
)
557 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
558 kvm_destroy_dirty_bitmap(free
);
560 kvm_arch_free_memslot(kvm
, free
, dont
);
565 static void kvm_free_physmem(struct kvm
*kvm
)
567 struct kvm_memslots
*slots
= kvm
->memslots
;
568 struct kvm_memory_slot
*memslot
;
570 kvm_for_each_memslot(memslot
, slots
)
571 kvm_free_physmem_slot(kvm
, memslot
, NULL
);
573 kfree(kvm
->memslots
);
576 static void kvm_destroy_devices(struct kvm
*kvm
)
578 struct list_head
*node
, *tmp
;
580 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
581 struct kvm_device
*dev
=
582 list_entry(node
, struct kvm_device
, vm_node
);
585 dev
->ops
->destroy(dev
);
589 static void kvm_destroy_vm(struct kvm
*kvm
)
592 struct mm_struct
*mm
= kvm
->mm
;
594 kvm_arch_sync_events(kvm
);
595 spin_lock(&kvm_lock
);
596 list_del(&kvm
->vm_list
);
597 spin_unlock(&kvm_lock
);
598 kvm_free_irq_routing(kvm
);
599 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
600 kvm_io_bus_destroy(kvm
->buses
[i
]);
601 kvm_coalesced_mmio_free(kvm
);
602 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
603 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
605 kvm_arch_flush_shadow_all(kvm
);
607 kvm_arch_destroy_vm(kvm
);
608 kvm_destroy_devices(kvm
);
609 kvm_free_physmem(kvm
);
610 cleanup_srcu_struct(&kvm
->irq_srcu
);
611 cleanup_srcu_struct(&kvm
->srcu
);
612 kvm_arch_free_vm(kvm
);
613 hardware_disable_all();
617 void kvm_get_kvm(struct kvm
*kvm
)
619 atomic_inc(&kvm
->users_count
);
621 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
623 void kvm_put_kvm(struct kvm
*kvm
)
625 if (atomic_dec_and_test(&kvm
->users_count
))
628 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
631 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
633 struct kvm
*kvm
= filp
->private_data
;
635 kvm_irqfd_release(kvm
);
642 * Allocation size is twice as large as the actual dirty bitmap size.
643 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
645 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
647 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
649 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
650 if (!memslot
->dirty_bitmap
)
657 * Insert memslot and re-sort memslots based on their GFN,
658 * so binary search could be used to lookup GFN.
659 * Sorting algorithm takes advantage of having initially
660 * sorted array and known changed memslot position.
662 static void update_memslots(struct kvm_memslots
*slots
,
663 struct kvm_memory_slot
*new)
666 int i
= slots
->id_to_index
[id
];
667 struct kvm_memory_slot
*mslots
= slots
->memslots
;
669 WARN_ON(mslots
[i
].id
!= id
);
671 WARN_ON(!mslots
[i
].npages
);
674 if (mslots
[i
].npages
)
677 if (!mslots
[i
].npages
)
681 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
682 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
683 if (!mslots
[i
+ 1].npages
)
685 mslots
[i
] = mslots
[i
+ 1];
686 slots
->id_to_index
[mslots
[i
].id
] = i
;
691 * The ">=" is needed when creating a slot with base_gfn == 0,
692 * so that it moves before all those with base_gfn == npages == 0.
694 * On the other hand, if new->npages is zero, the above loop has
695 * already left i pointing to the beginning of the empty part of
696 * mslots, and the ">=" would move the hole backwards in this
697 * case---which is wrong. So skip the loop when deleting a slot.
701 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
702 mslots
[i
] = mslots
[i
- 1];
703 slots
->id_to_index
[mslots
[i
].id
] = i
;
707 WARN_ON_ONCE(i
!= slots
->used_slots
);
710 slots
->id_to_index
[mslots
[i
].id
] = i
;
713 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
715 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
717 #ifdef __KVM_HAVE_READONLY_MEM
718 valid_flags
|= KVM_MEM_READONLY
;
721 if (mem
->flags
& ~valid_flags
)
727 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
728 struct kvm_memslots
*slots
)
730 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
733 * Set the low bit in the generation, which disables SPTE caching
734 * until the end of synchronize_srcu_expedited.
736 WARN_ON(old_memslots
->generation
& 1);
737 slots
->generation
= old_memslots
->generation
+ 1;
739 rcu_assign_pointer(kvm
->memslots
, slots
);
740 synchronize_srcu_expedited(&kvm
->srcu
);
743 * Increment the new memslot generation a second time. This prevents
744 * vm exits that race with memslot updates from caching a memslot
745 * generation that will (potentially) be valid forever.
749 kvm_arch_memslots_updated(kvm
);
755 * Allocate some memory and give it an address in the guest physical address
758 * Discontiguous memory is allowed, mostly for framebuffers.
760 * Must be called holding kvm->slots_lock for write.
762 int __kvm_set_memory_region(struct kvm
*kvm
,
763 struct kvm_userspace_memory_region
*mem
)
767 unsigned long npages
;
768 struct kvm_memory_slot
*slot
;
769 struct kvm_memory_slot old
, new;
770 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
771 enum kvm_mr_change change
;
773 r
= check_memory_region_flags(mem
);
778 /* General sanity checks */
779 if (mem
->memory_size
& (PAGE_SIZE
- 1))
781 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
783 /* We can read the guest memory with __xxx_user() later on. */
784 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
785 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
786 !access_ok(VERIFY_WRITE
,
787 (void __user
*)(unsigned long)mem
->userspace_addr
,
790 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
792 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
795 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
796 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
797 npages
= mem
->memory_size
>> PAGE_SHIFT
;
799 if (npages
> KVM_MEM_MAX_NR_PAGES
)
803 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
808 new.base_gfn
= base_gfn
;
810 new.flags
= mem
->flags
;
814 change
= KVM_MR_CREATE
;
815 else { /* Modify an existing slot. */
816 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
817 (npages
!= old
.npages
) ||
818 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
821 if (base_gfn
!= old
.base_gfn
)
822 change
= KVM_MR_MOVE
;
823 else if (new.flags
!= old
.flags
)
824 change
= KVM_MR_FLAGS_ONLY
;
825 else { /* Nothing to change. */
830 } else if (old
.npages
) {
831 change
= KVM_MR_DELETE
;
832 } else /* Modify a non-existent slot: disallowed. */
835 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
836 /* Check for overlaps */
838 kvm_for_each_memslot(slot
, kvm
->memslots
) {
839 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
840 (slot
->id
== mem
->slot
))
842 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
843 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
848 /* Free page dirty bitmap if unneeded */
849 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
850 new.dirty_bitmap
= NULL
;
853 if (change
== KVM_MR_CREATE
) {
854 new.userspace_addr
= mem
->userspace_addr
;
856 if (kvm_arch_create_memslot(kvm
, &new, npages
))
860 /* Allocate page dirty bitmap if needed */
861 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
862 if (kvm_create_dirty_bitmap(&new) < 0)
866 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
871 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
872 slot
= id_to_memslot(slots
, mem
->slot
);
873 slot
->flags
|= KVM_MEMSLOT_INVALID
;
875 old_memslots
= install_new_memslots(kvm
, slots
);
877 /* slot was deleted or moved, clear iommu mapping */
878 kvm_iommu_unmap_pages(kvm
, &old
);
879 /* From this point no new shadow pages pointing to a deleted,
880 * or moved, memslot will be created.
882 * validation of sp->gfn happens in:
883 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
884 * - kvm_is_visible_gfn (mmu_check_roots)
886 kvm_arch_flush_shadow_memslot(kvm
, slot
);
889 * We can re-use the old_memslots from above, the only difference
890 * from the currently installed memslots is the invalid flag. This
891 * will get overwritten by update_memslots anyway.
893 slots
= old_memslots
;
896 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
900 /* actual memory is freed via old in kvm_free_physmem_slot below */
901 if (change
== KVM_MR_DELETE
) {
902 new.dirty_bitmap
= NULL
;
903 memset(&new.arch
, 0, sizeof(new.arch
));
906 update_memslots(slots
, &new);
907 old_memslots
= install_new_memslots(kvm
, slots
);
909 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
911 kvm_free_physmem_slot(kvm
, &old
, &new);
915 * IOMMU mapping: New slots need to be mapped. Old slots need to be
916 * un-mapped and re-mapped if their base changes. Since base change
917 * unmapping is handled above with slot deletion, mapping alone is
918 * needed here. Anything else the iommu might care about for existing
919 * slots (size changes, userspace addr changes and read-only flag
920 * changes) is disallowed above, so any other attribute changes getting
921 * here can be skipped.
923 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
924 r
= kvm_iommu_map_pages(kvm
, &new);
933 kvm_free_physmem_slot(kvm
, &new, &old
);
937 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
939 int kvm_set_memory_region(struct kvm
*kvm
,
940 struct kvm_userspace_memory_region
*mem
)
944 mutex_lock(&kvm
->slots_lock
);
945 r
= __kvm_set_memory_region(kvm
, mem
);
946 mutex_unlock(&kvm
->slots_lock
);
949 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
951 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
952 struct kvm_userspace_memory_region
*mem
)
954 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
956 return kvm_set_memory_region(kvm
, mem
);
959 int kvm_get_dirty_log(struct kvm
*kvm
,
960 struct kvm_dirty_log
*log
, int *is_dirty
)
962 struct kvm_memory_slot
*memslot
;
965 unsigned long any
= 0;
968 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
971 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
973 if (!memslot
->dirty_bitmap
)
976 n
= kvm_dirty_bitmap_bytes(memslot
);
978 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
979 any
= memslot
->dirty_bitmap
[i
];
982 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
992 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
994 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
996 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
997 * are dirty write protect them for next write.
998 * @kvm: pointer to kvm instance
999 * @log: slot id and address to which we copy the log
1000 * @is_dirty: flag set if any page is dirty
1002 * We need to keep it in mind that VCPU threads can write to the bitmap
1003 * concurrently. So, to avoid losing track of dirty pages we keep the
1006 * 1. Take a snapshot of the bit and clear it if needed.
1007 * 2. Write protect the corresponding page.
1008 * 3. Copy the snapshot to the userspace.
1009 * 4. Upon return caller flushes TLB's if needed.
1011 * Between 2 and 4, the guest may write to the page using the remaining TLB
1012 * entry. This is not a problem because the page is reported dirty using
1013 * the snapshot taken before and step 4 ensures that writes done after
1014 * exiting to userspace will be logged for the next call.
1017 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1018 struct kvm_dirty_log
*log
, bool *is_dirty
)
1020 struct kvm_memory_slot
*memslot
;
1023 unsigned long *dirty_bitmap
;
1024 unsigned long *dirty_bitmap_buffer
;
1027 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
1030 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
1032 dirty_bitmap
= memslot
->dirty_bitmap
;
1037 n
= kvm_dirty_bitmap_bytes(memslot
);
1039 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1040 memset(dirty_bitmap_buffer
, 0, n
);
1042 spin_lock(&kvm
->mmu_lock
);
1044 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1048 if (!dirty_bitmap
[i
])
1053 mask
= xchg(&dirty_bitmap
[i
], 0);
1054 dirty_bitmap_buffer
[i
] = mask
;
1057 offset
= i
* BITS_PER_LONG
;
1058 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
,
1063 spin_unlock(&kvm
->mmu_lock
);
1066 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1073 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1076 bool kvm_largepages_enabled(void)
1078 return largepages_enabled
;
1081 void kvm_disable_largepages(void)
1083 largepages_enabled
= false;
1085 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1087 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1089 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1091 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1093 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1095 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1097 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1098 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1103 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1105 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1107 struct vm_area_struct
*vma
;
1108 unsigned long addr
, size
;
1112 addr
= gfn_to_hva(kvm
, gfn
);
1113 if (kvm_is_error_hva(addr
))
1116 down_read(¤t
->mm
->mmap_sem
);
1117 vma
= find_vma(current
->mm
, addr
);
1121 size
= vma_kernel_pagesize(vma
);
1124 up_read(¤t
->mm
->mmap_sem
);
1129 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1131 return slot
->flags
& KVM_MEM_READONLY
;
1134 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1135 gfn_t
*nr_pages
, bool write
)
1137 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1138 return KVM_HVA_ERR_BAD
;
1140 if (memslot_is_readonly(slot
) && write
)
1141 return KVM_HVA_ERR_RO_BAD
;
1144 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1146 return __gfn_to_hva_memslot(slot
, gfn
);
1149 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1152 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1155 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1158 return gfn_to_hva_many(slot
, gfn
, NULL
);
1160 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1162 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1164 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1166 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1169 * If writable is set to false, the hva returned by this function is only
1170 * allowed to be read.
1172 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1173 gfn_t gfn
, bool *writable
)
1175 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1177 if (!kvm_is_error_hva(hva
) && writable
)
1178 *writable
= !memslot_is_readonly(slot
);
1183 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1185 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1187 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1190 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1192 return __copy_from_user(data
, hva
, len
);
1195 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1197 return __copy_from_user_inatomic(data
, hva
, len
);
1200 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1201 unsigned long start
, int write
, struct page
**page
)
1203 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1206 flags
|= FOLL_WRITE
;
1208 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1211 static inline int check_user_page_hwpoison(unsigned long addr
)
1213 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1215 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1216 flags
, NULL
, NULL
, NULL
);
1217 return rc
== -EHWPOISON
;
1221 * The atomic path to get the writable pfn which will be stored in @pfn,
1222 * true indicates success, otherwise false is returned.
1224 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1225 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1227 struct page
*page
[1];
1230 if (!(async
|| atomic
))
1234 * Fast pin a writable pfn only if it is a write fault request
1235 * or the caller allows to map a writable pfn for a read fault
1238 if (!(write_fault
|| writable
))
1241 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1243 *pfn
= page_to_pfn(page
[0]);
1254 * The slow path to get the pfn of the specified host virtual address,
1255 * 1 indicates success, -errno is returned if error is detected.
1257 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1258 bool *writable
, pfn_t
*pfn
)
1260 struct page
*page
[1];
1266 *writable
= write_fault
;
1269 down_read(¤t
->mm
->mmap_sem
);
1270 npages
= get_user_page_nowait(current
, current
->mm
,
1271 addr
, write_fault
, page
);
1272 up_read(¤t
->mm
->mmap_sem
);
1274 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1275 write_fault
, 0, page
,
1276 FOLL_TOUCH
|FOLL_HWPOISON
);
1280 /* map read fault as writable if possible */
1281 if (unlikely(!write_fault
) && writable
) {
1282 struct page
*wpage
[1];
1284 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1293 *pfn
= page_to_pfn(page
[0]);
1297 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1299 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1302 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1309 * Pin guest page in memory and return its pfn.
1310 * @addr: host virtual address which maps memory to the guest
1311 * @atomic: whether this function can sleep
1312 * @async: whether this function need to wait IO complete if the
1313 * host page is not in the memory
1314 * @write_fault: whether we should get a writable host page
1315 * @writable: whether it allows to map a writable host page for !@write_fault
1317 * The function will map a writable host page for these two cases:
1318 * 1): @write_fault = true
1319 * 2): @write_fault = false && @writable, @writable will tell the caller
1320 * whether the mapping is writable.
1322 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1323 bool write_fault
, bool *writable
)
1325 struct vm_area_struct
*vma
;
1329 /* we can do it either atomically or asynchronously, not both */
1330 BUG_ON(atomic
&& async
);
1332 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1336 return KVM_PFN_ERR_FAULT
;
1338 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1342 down_read(¤t
->mm
->mmap_sem
);
1343 if (npages
== -EHWPOISON
||
1344 (!async
&& check_user_page_hwpoison(addr
))) {
1345 pfn
= KVM_PFN_ERR_HWPOISON
;
1349 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1352 pfn
= KVM_PFN_ERR_FAULT
;
1353 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1354 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1356 BUG_ON(!kvm_is_reserved_pfn(pfn
));
1358 if (async
&& vma_is_valid(vma
, write_fault
))
1360 pfn
= KVM_PFN_ERR_FAULT
;
1363 up_read(¤t
->mm
->mmap_sem
);
1368 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1369 bool *async
, bool write_fault
, bool *writable
)
1371 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1373 if (addr
== KVM_HVA_ERR_RO_BAD
)
1374 return KVM_PFN_ERR_RO_FAULT
;
1376 if (kvm_is_error_hva(addr
))
1377 return KVM_PFN_NOSLOT
;
1379 /* Do not map writable pfn in the readonly memslot. */
1380 if (writable
&& memslot_is_readonly(slot
)) {
1385 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1389 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1390 bool write_fault
, bool *writable
)
1392 struct kvm_memory_slot
*slot
;
1397 slot
= gfn_to_memslot(kvm
, gfn
);
1399 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1403 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1405 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1407 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1409 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1410 bool write_fault
, bool *writable
)
1412 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1414 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1416 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1418 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1420 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1422 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1425 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1427 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1429 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1431 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1434 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1436 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1438 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1440 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1446 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1447 if (kvm_is_error_hva(addr
))
1450 if (entry
< nr_pages
)
1453 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1455 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1457 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1459 if (is_error_noslot_pfn(pfn
))
1460 return KVM_ERR_PTR_BAD_PAGE
;
1462 if (kvm_is_reserved_pfn(pfn
)) {
1464 return KVM_ERR_PTR_BAD_PAGE
;
1467 return pfn_to_page(pfn
);
1470 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1474 pfn
= gfn_to_pfn(kvm
, gfn
);
1476 return kvm_pfn_to_page(pfn
);
1478 EXPORT_SYMBOL_GPL(gfn_to_page
);
1480 void kvm_release_page_clean(struct page
*page
)
1482 WARN_ON(is_error_page(page
));
1484 kvm_release_pfn_clean(page_to_pfn(page
));
1486 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1488 void kvm_release_pfn_clean(pfn_t pfn
)
1490 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1491 put_page(pfn_to_page(pfn
));
1493 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1495 void kvm_release_page_dirty(struct page
*page
)
1497 WARN_ON(is_error_page(page
));
1499 kvm_release_pfn_dirty(page_to_pfn(page
));
1501 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1503 static void kvm_release_pfn_dirty(pfn_t pfn
)
1505 kvm_set_pfn_dirty(pfn
);
1506 kvm_release_pfn_clean(pfn
);
1509 void kvm_set_pfn_dirty(pfn_t pfn
)
1511 if (!kvm_is_reserved_pfn(pfn
)) {
1512 struct page
*page
= pfn_to_page(pfn
);
1514 if (!PageReserved(page
))
1518 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1520 void kvm_set_pfn_accessed(pfn_t pfn
)
1522 if (!kvm_is_reserved_pfn(pfn
))
1523 mark_page_accessed(pfn_to_page(pfn
));
1525 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1527 void kvm_get_pfn(pfn_t pfn
)
1529 if (!kvm_is_reserved_pfn(pfn
))
1530 get_page(pfn_to_page(pfn
));
1532 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1534 static int next_segment(unsigned long len
, int offset
)
1536 if (len
> PAGE_SIZE
- offset
)
1537 return PAGE_SIZE
- offset
;
1542 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1548 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1549 if (kvm_is_error_hva(addr
))
1551 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1556 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1558 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1560 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1562 int offset
= offset_in_page(gpa
);
1565 while ((seg
= next_segment(len
, offset
)) != 0) {
1566 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1576 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1578 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1583 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1584 int offset
= offset_in_page(gpa
);
1586 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1587 if (kvm_is_error_hva(addr
))
1589 pagefault_disable();
1590 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1596 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1598 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1599 int offset
, int len
)
1604 addr
= gfn_to_hva(kvm
, gfn
);
1605 if (kvm_is_error_hva(addr
))
1607 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1610 mark_page_dirty(kvm
, gfn
);
1613 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1615 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1618 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1620 int offset
= offset_in_page(gpa
);
1623 while ((seg
= next_segment(len
, offset
)) != 0) {
1624 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1634 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1636 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1637 gpa_t gpa
, unsigned long len
)
1639 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1640 int offset
= offset_in_page(gpa
);
1641 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1642 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1643 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1644 gfn_t nr_pages_avail
;
1647 ghc
->generation
= slots
->generation
;
1649 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1650 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1651 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1655 * If the requested region crosses two memslots, we still
1656 * verify that the entire region is valid here.
1658 while (start_gfn
<= end_gfn
) {
1659 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1660 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1662 if (kvm_is_error_hva(ghc
->hva
))
1664 start_gfn
+= nr_pages_avail
;
1666 /* Use the slow path for cross page reads and writes. */
1667 ghc
->memslot
= NULL
;
1671 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1673 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1674 void *data
, unsigned long len
)
1676 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1679 BUG_ON(len
> ghc
->len
);
1681 if (slots
->generation
!= ghc
->generation
)
1682 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1684 if (unlikely(!ghc
->memslot
))
1685 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1687 if (kvm_is_error_hva(ghc
->hva
))
1690 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1693 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1697 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1699 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1700 void *data
, unsigned long len
)
1702 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1705 BUG_ON(len
> ghc
->len
);
1707 if (slots
->generation
!= ghc
->generation
)
1708 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1710 if (unlikely(!ghc
->memslot
))
1711 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1713 if (kvm_is_error_hva(ghc
->hva
))
1716 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1722 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1724 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1726 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1728 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1730 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1732 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1734 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1736 int offset
= offset_in_page(gpa
);
1739 while ((seg
= next_segment(len
, offset
)) != 0) {
1740 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1749 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1751 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
1752 struct kvm_memory_slot
*memslot
,
1755 if (memslot
&& memslot
->dirty_bitmap
) {
1756 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1758 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1762 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1764 struct kvm_memory_slot
*memslot
;
1766 memslot
= gfn_to_memslot(kvm
, gfn
);
1767 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1769 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1771 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
1773 if (kvm_arch_vcpu_runnable(vcpu
)) {
1774 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1777 if (kvm_cpu_has_pending_timer(vcpu
))
1779 if (signal_pending(current
))
1786 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1788 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1792 bool waited
= false;
1794 start
= cur
= ktime_get();
1796 ktime_t stop
= ktime_add_ns(ktime_get(), halt_poll_ns
);
1800 * This sets KVM_REQ_UNHALT if an interrupt
1803 if (kvm_vcpu_check_block(vcpu
) < 0) {
1804 ++vcpu
->stat
.halt_successful_poll
;
1808 } while (single_task_running() && ktime_before(cur
, stop
));
1812 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1814 if (kvm_vcpu_check_block(vcpu
) < 0)
1821 finish_wait(&vcpu
->wq
, &wait
);
1825 trace_kvm_vcpu_wakeup(ktime_to_ns(cur
) - ktime_to_ns(start
), waited
);
1827 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1831 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1833 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1836 int cpu
= vcpu
->cpu
;
1837 wait_queue_head_t
*wqp
;
1839 wqp
= kvm_arch_vcpu_wq(vcpu
);
1840 if (waitqueue_active(wqp
)) {
1841 wake_up_interruptible(wqp
);
1842 ++vcpu
->stat
.halt_wakeup
;
1846 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1847 if (kvm_arch_vcpu_should_kick(vcpu
))
1848 smp_send_reschedule(cpu
);
1851 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1852 #endif /* !CONFIG_S390 */
1854 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1857 struct task_struct
*task
= NULL
;
1861 pid
= rcu_dereference(target
->pid
);
1863 task
= get_pid_task(pid
, PIDTYPE_PID
);
1867 ret
= yield_to(task
, 1);
1868 put_task_struct(task
);
1872 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1875 * Helper that checks whether a VCPU is eligible for directed yield.
1876 * Most eligible candidate to yield is decided by following heuristics:
1878 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1879 * (preempted lock holder), indicated by @in_spin_loop.
1880 * Set at the beiginning and cleared at the end of interception/PLE handler.
1882 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1883 * chance last time (mostly it has become eligible now since we have probably
1884 * yielded to lockholder in last iteration. This is done by toggling
1885 * @dy_eligible each time a VCPU checked for eligibility.)
1887 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1888 * to preempted lock-holder could result in wrong VCPU selection and CPU
1889 * burning. Giving priority for a potential lock-holder increases lock
1892 * Since algorithm is based on heuristics, accessing another VCPU data without
1893 * locking does not harm. It may result in trying to yield to same VCPU, fail
1894 * and continue with next VCPU and so on.
1896 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1898 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1901 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1902 vcpu
->spin_loop
.dy_eligible
;
1904 if (vcpu
->spin_loop
.in_spin_loop
)
1905 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1913 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1915 struct kvm
*kvm
= me
->kvm
;
1916 struct kvm_vcpu
*vcpu
;
1917 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1923 kvm_vcpu_set_in_spin_loop(me
, true);
1925 * We boost the priority of a VCPU that is runnable but not
1926 * currently running, because it got preempted by something
1927 * else and called schedule in __vcpu_run. Hopefully that
1928 * VCPU is holding the lock that we need and will release it.
1929 * We approximate round-robin by starting at the last boosted VCPU.
1931 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1932 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1933 if (!pass
&& i
<= last_boosted_vcpu
) {
1934 i
= last_boosted_vcpu
;
1936 } else if (pass
&& i
> last_boosted_vcpu
)
1938 if (!ACCESS_ONCE(vcpu
->preempted
))
1942 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
1944 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1947 yielded
= kvm_vcpu_yield_to(vcpu
);
1949 kvm
->last_boosted_vcpu
= i
;
1951 } else if (yielded
< 0) {
1958 kvm_vcpu_set_in_spin_loop(me
, false);
1960 /* Ensure vcpu is not eligible during next spinloop */
1961 kvm_vcpu_set_dy_eligible(me
, false);
1963 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1965 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1967 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1970 if (vmf
->pgoff
== 0)
1971 page
= virt_to_page(vcpu
->run
);
1973 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1974 page
= virt_to_page(vcpu
->arch
.pio_data
);
1976 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1977 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1978 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1981 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1987 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1988 .fault
= kvm_vcpu_fault
,
1991 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1993 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1997 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1999 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2001 kvm_put_kvm(vcpu
->kvm
);
2005 static struct file_operations kvm_vcpu_fops
= {
2006 .release
= kvm_vcpu_release
,
2007 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2008 #ifdef CONFIG_KVM_COMPAT
2009 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2011 .mmap
= kvm_vcpu_mmap
,
2012 .llseek
= noop_llseek
,
2016 * Allocates an inode for the vcpu.
2018 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2020 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2024 * Creates some virtual cpus. Good luck creating more than one.
2026 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2029 struct kvm_vcpu
*vcpu
, *v
;
2031 if (id
>= KVM_MAX_VCPUS
)
2034 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2036 return PTR_ERR(vcpu
);
2038 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2040 r
= kvm_arch_vcpu_setup(vcpu
);
2044 mutex_lock(&kvm
->lock
);
2045 if (!kvm_vcpu_compatible(vcpu
)) {
2047 goto unlock_vcpu_destroy
;
2049 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
2051 goto unlock_vcpu_destroy
;
2054 kvm_for_each_vcpu(r
, v
, kvm
)
2055 if (v
->vcpu_id
== id
) {
2057 goto unlock_vcpu_destroy
;
2060 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2062 /* Now it's all set up, let userspace reach it */
2064 r
= create_vcpu_fd(vcpu
);
2067 goto unlock_vcpu_destroy
;
2070 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2072 atomic_inc(&kvm
->online_vcpus
);
2074 mutex_unlock(&kvm
->lock
);
2075 kvm_arch_vcpu_postcreate(vcpu
);
2078 unlock_vcpu_destroy
:
2079 mutex_unlock(&kvm
->lock
);
2081 kvm_arch_vcpu_destroy(vcpu
);
2085 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2088 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2089 vcpu
->sigset_active
= 1;
2090 vcpu
->sigset
= *sigset
;
2092 vcpu
->sigset_active
= 0;
2096 static long kvm_vcpu_ioctl(struct file
*filp
,
2097 unsigned int ioctl
, unsigned long arg
)
2099 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2100 void __user
*argp
= (void __user
*)arg
;
2102 struct kvm_fpu
*fpu
= NULL
;
2103 struct kvm_sregs
*kvm_sregs
= NULL
;
2105 if (vcpu
->kvm
->mm
!= current
->mm
)
2108 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2111 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2113 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2114 * so vcpu_load() would break it.
2116 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_S390_IRQ
|| ioctl
== KVM_INTERRUPT
)
2117 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2121 r
= vcpu_load(vcpu
);
2129 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2130 /* The thread running this VCPU changed. */
2131 struct pid
*oldpid
= vcpu
->pid
;
2132 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2134 rcu_assign_pointer(vcpu
->pid
, newpid
);
2139 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2140 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2142 case KVM_GET_REGS
: {
2143 struct kvm_regs
*kvm_regs
;
2146 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2149 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2153 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2160 case KVM_SET_REGS
: {
2161 struct kvm_regs
*kvm_regs
;
2164 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2165 if (IS_ERR(kvm_regs
)) {
2166 r
= PTR_ERR(kvm_regs
);
2169 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2173 case KVM_GET_SREGS
: {
2174 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2178 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2182 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2187 case KVM_SET_SREGS
: {
2188 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2189 if (IS_ERR(kvm_sregs
)) {
2190 r
= PTR_ERR(kvm_sregs
);
2194 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2197 case KVM_GET_MP_STATE
: {
2198 struct kvm_mp_state mp_state
;
2200 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2204 if (copy_to_user(argp
, &mp_state
, sizeof(mp_state
)))
2209 case KVM_SET_MP_STATE
: {
2210 struct kvm_mp_state mp_state
;
2213 if (copy_from_user(&mp_state
, argp
, sizeof(mp_state
)))
2215 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2218 case KVM_TRANSLATE
: {
2219 struct kvm_translation tr
;
2222 if (copy_from_user(&tr
, argp
, sizeof(tr
)))
2224 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2228 if (copy_to_user(argp
, &tr
, sizeof(tr
)))
2233 case KVM_SET_GUEST_DEBUG
: {
2234 struct kvm_guest_debug dbg
;
2237 if (copy_from_user(&dbg
, argp
, sizeof(dbg
)))
2239 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2242 case KVM_SET_SIGNAL_MASK
: {
2243 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2244 struct kvm_signal_mask kvm_sigmask
;
2245 sigset_t sigset
, *p
;
2250 if (copy_from_user(&kvm_sigmask
, argp
,
2251 sizeof(kvm_sigmask
)))
2254 if (kvm_sigmask
.len
!= sizeof(sigset
))
2257 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2262 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2266 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2270 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2274 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2280 fpu
= memdup_user(argp
, sizeof(*fpu
));
2286 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2290 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2299 #ifdef CONFIG_KVM_COMPAT
2300 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2301 unsigned int ioctl
, unsigned long arg
)
2303 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2304 void __user
*argp
= compat_ptr(arg
);
2307 if (vcpu
->kvm
->mm
!= current
->mm
)
2311 case KVM_SET_SIGNAL_MASK
: {
2312 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2313 struct kvm_signal_mask kvm_sigmask
;
2314 compat_sigset_t csigset
;
2319 if (copy_from_user(&kvm_sigmask
, argp
,
2320 sizeof(kvm_sigmask
)))
2323 if (kvm_sigmask
.len
!= sizeof(csigset
))
2326 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2329 sigset_from_compat(&sigset
, &csigset
);
2330 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2332 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2336 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2344 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2345 int (*accessor
)(struct kvm_device
*dev
,
2346 struct kvm_device_attr
*attr
),
2349 struct kvm_device_attr attr
;
2354 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2357 return accessor(dev
, &attr
);
2360 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2363 struct kvm_device
*dev
= filp
->private_data
;
2366 case KVM_SET_DEVICE_ATTR
:
2367 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2368 case KVM_GET_DEVICE_ATTR
:
2369 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2370 case KVM_HAS_DEVICE_ATTR
:
2371 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2373 if (dev
->ops
->ioctl
)
2374 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2380 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2382 struct kvm_device
*dev
= filp
->private_data
;
2383 struct kvm
*kvm
= dev
->kvm
;
2389 static const struct file_operations kvm_device_fops
= {
2390 .unlocked_ioctl
= kvm_device_ioctl
,
2391 #ifdef CONFIG_KVM_COMPAT
2392 .compat_ioctl
= kvm_device_ioctl
,
2394 .release
= kvm_device_release
,
2397 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2399 if (filp
->f_op
!= &kvm_device_fops
)
2402 return filp
->private_data
;
2405 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2406 #ifdef CONFIG_KVM_MPIC
2407 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2408 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2411 #ifdef CONFIG_KVM_XICS
2412 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2416 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2418 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2421 if (kvm_device_ops_table
[type
] != NULL
)
2424 kvm_device_ops_table
[type
] = ops
;
2428 void kvm_unregister_device_ops(u32 type
)
2430 if (kvm_device_ops_table
[type
] != NULL
)
2431 kvm_device_ops_table
[type
] = NULL
;
2434 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2435 struct kvm_create_device
*cd
)
2437 struct kvm_device_ops
*ops
= NULL
;
2438 struct kvm_device
*dev
;
2439 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2442 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2445 ops
= kvm_device_ops_table
[cd
->type
];
2452 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2459 ret
= ops
->create(dev
, cd
->type
);
2465 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2471 list_add(&dev
->vm_node
, &kvm
->devices
);
2477 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2480 case KVM_CAP_USER_MEMORY
:
2481 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2482 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2483 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2484 case KVM_CAP_SET_BOOT_CPU_ID
:
2486 case KVM_CAP_INTERNAL_ERROR_DATA
:
2487 #ifdef CONFIG_HAVE_KVM_MSI
2488 case KVM_CAP_SIGNAL_MSI
:
2490 #ifdef CONFIG_HAVE_KVM_IRQFD
2491 case KVM_CAP_IRQFD_RESAMPLE
:
2493 case KVM_CAP_CHECK_EXTENSION_VM
:
2495 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2496 case KVM_CAP_IRQ_ROUTING
:
2497 return KVM_MAX_IRQ_ROUTES
;
2502 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2505 static long kvm_vm_ioctl(struct file
*filp
,
2506 unsigned int ioctl
, unsigned long arg
)
2508 struct kvm
*kvm
= filp
->private_data
;
2509 void __user
*argp
= (void __user
*)arg
;
2512 if (kvm
->mm
!= current
->mm
)
2515 case KVM_CREATE_VCPU
:
2516 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2518 case KVM_SET_USER_MEMORY_REGION
: {
2519 struct kvm_userspace_memory_region kvm_userspace_mem
;
2522 if (copy_from_user(&kvm_userspace_mem
, argp
,
2523 sizeof(kvm_userspace_mem
)))
2526 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2529 case KVM_GET_DIRTY_LOG
: {
2530 struct kvm_dirty_log log
;
2533 if (copy_from_user(&log
, argp
, sizeof(log
)))
2535 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2538 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2539 case KVM_REGISTER_COALESCED_MMIO
: {
2540 struct kvm_coalesced_mmio_zone zone
;
2543 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2545 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2548 case KVM_UNREGISTER_COALESCED_MMIO
: {
2549 struct kvm_coalesced_mmio_zone zone
;
2552 if (copy_from_user(&zone
, argp
, sizeof(zone
)))
2554 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2559 struct kvm_irqfd data
;
2562 if (copy_from_user(&data
, argp
, sizeof(data
)))
2564 r
= kvm_irqfd(kvm
, &data
);
2567 case KVM_IOEVENTFD
: {
2568 struct kvm_ioeventfd data
;
2571 if (copy_from_user(&data
, argp
, sizeof(data
)))
2573 r
= kvm_ioeventfd(kvm
, &data
);
2576 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2577 case KVM_SET_BOOT_CPU_ID
:
2579 mutex_lock(&kvm
->lock
);
2580 if (atomic_read(&kvm
->online_vcpus
) != 0)
2583 kvm
->bsp_vcpu_id
= arg
;
2584 mutex_unlock(&kvm
->lock
);
2587 #ifdef CONFIG_HAVE_KVM_MSI
2588 case KVM_SIGNAL_MSI
: {
2592 if (copy_from_user(&msi
, argp
, sizeof(msi
)))
2594 r
= kvm_send_userspace_msi(kvm
, &msi
);
2598 #ifdef __KVM_HAVE_IRQ_LINE
2599 case KVM_IRQ_LINE_STATUS
:
2600 case KVM_IRQ_LINE
: {
2601 struct kvm_irq_level irq_event
;
2604 if (copy_from_user(&irq_event
, argp
, sizeof(irq_event
)))
2607 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2608 ioctl
== KVM_IRQ_LINE_STATUS
);
2613 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2614 if (copy_to_user(argp
, &irq_event
, sizeof(irq_event
)))
2622 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2623 case KVM_SET_GSI_ROUTING
: {
2624 struct kvm_irq_routing routing
;
2625 struct kvm_irq_routing __user
*urouting
;
2626 struct kvm_irq_routing_entry
*entries
;
2629 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2632 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2637 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2642 if (copy_from_user(entries
, urouting
->entries
,
2643 routing
.nr
* sizeof(*entries
)))
2644 goto out_free_irq_routing
;
2645 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2647 out_free_irq_routing
:
2651 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2652 case KVM_CREATE_DEVICE
: {
2653 struct kvm_create_device cd
;
2656 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2659 r
= kvm_ioctl_create_device(kvm
, &cd
);
2664 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2670 case KVM_CHECK_EXTENSION
:
2671 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2674 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2680 #ifdef CONFIG_KVM_COMPAT
2681 struct compat_kvm_dirty_log
{
2685 compat_uptr_t dirty_bitmap
; /* one bit per page */
2690 static long kvm_vm_compat_ioctl(struct file
*filp
,
2691 unsigned int ioctl
, unsigned long arg
)
2693 struct kvm
*kvm
= filp
->private_data
;
2696 if (kvm
->mm
!= current
->mm
)
2699 case KVM_GET_DIRTY_LOG
: {
2700 struct compat_kvm_dirty_log compat_log
;
2701 struct kvm_dirty_log log
;
2704 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2705 sizeof(compat_log
)))
2707 log
.slot
= compat_log
.slot
;
2708 log
.padding1
= compat_log
.padding1
;
2709 log
.padding2
= compat_log
.padding2
;
2710 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2712 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2716 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2724 static struct file_operations kvm_vm_fops
= {
2725 .release
= kvm_vm_release
,
2726 .unlocked_ioctl
= kvm_vm_ioctl
,
2727 #ifdef CONFIG_KVM_COMPAT
2728 .compat_ioctl
= kvm_vm_compat_ioctl
,
2730 .llseek
= noop_llseek
,
2733 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2738 kvm
= kvm_create_vm(type
);
2740 return PTR_ERR(kvm
);
2741 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2742 r
= kvm_coalesced_mmio_init(kvm
);
2748 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2755 static long kvm_dev_ioctl(struct file
*filp
,
2756 unsigned int ioctl
, unsigned long arg
)
2761 case KVM_GET_API_VERSION
:
2764 r
= KVM_API_VERSION
;
2767 r
= kvm_dev_ioctl_create_vm(arg
);
2769 case KVM_CHECK_EXTENSION
:
2770 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2772 case KVM_GET_VCPU_MMAP_SIZE
:
2775 r
= PAGE_SIZE
; /* struct kvm_run */
2777 r
+= PAGE_SIZE
; /* pio data page */
2779 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2780 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2783 case KVM_TRACE_ENABLE
:
2784 case KVM_TRACE_PAUSE
:
2785 case KVM_TRACE_DISABLE
:
2789 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2795 static struct file_operations kvm_chardev_ops
= {
2796 .unlocked_ioctl
= kvm_dev_ioctl
,
2797 .compat_ioctl
= kvm_dev_ioctl
,
2798 .llseek
= noop_llseek
,
2801 static struct miscdevice kvm_dev
= {
2807 static void hardware_enable_nolock(void *junk
)
2809 int cpu
= raw_smp_processor_id();
2812 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2815 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2817 r
= kvm_arch_hardware_enable();
2820 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2821 atomic_inc(&hardware_enable_failed
);
2822 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu
);
2826 static void hardware_enable(void)
2828 raw_spin_lock(&kvm_count_lock
);
2829 if (kvm_usage_count
)
2830 hardware_enable_nolock(NULL
);
2831 raw_spin_unlock(&kvm_count_lock
);
2834 static void hardware_disable_nolock(void *junk
)
2836 int cpu
= raw_smp_processor_id();
2838 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2840 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2841 kvm_arch_hardware_disable();
2844 static void hardware_disable(void)
2846 raw_spin_lock(&kvm_count_lock
);
2847 if (kvm_usage_count
)
2848 hardware_disable_nolock(NULL
);
2849 raw_spin_unlock(&kvm_count_lock
);
2852 static void hardware_disable_all_nolock(void)
2854 BUG_ON(!kvm_usage_count
);
2857 if (!kvm_usage_count
)
2858 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2861 static void hardware_disable_all(void)
2863 raw_spin_lock(&kvm_count_lock
);
2864 hardware_disable_all_nolock();
2865 raw_spin_unlock(&kvm_count_lock
);
2868 static int hardware_enable_all(void)
2872 raw_spin_lock(&kvm_count_lock
);
2875 if (kvm_usage_count
== 1) {
2876 atomic_set(&hardware_enable_failed
, 0);
2877 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2879 if (atomic_read(&hardware_enable_failed
)) {
2880 hardware_disable_all_nolock();
2885 raw_spin_unlock(&kvm_count_lock
);
2890 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2895 val
&= ~CPU_TASKS_FROZEN
;
2898 pr_info("kvm: disabling virtualization on CPU%d\n",
2903 pr_info("kvm: enabling virtualization on CPU%d\n",
2911 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2915 * Some (well, at least mine) BIOSes hang on reboot if
2918 * And Intel TXT required VMX off for all cpu when system shutdown.
2920 pr_info("kvm: exiting hardware virtualization\n");
2921 kvm_rebooting
= true;
2922 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2926 static struct notifier_block kvm_reboot_notifier
= {
2927 .notifier_call
= kvm_reboot
,
2931 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2935 for (i
= 0; i
< bus
->dev_count
; i
++) {
2936 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2938 kvm_iodevice_destructor(pos
);
2943 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
2944 const struct kvm_io_range
*r2
)
2946 if (r1
->addr
< r2
->addr
)
2948 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2953 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2955 return kvm_io_bus_cmp(p1
, p2
);
2958 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2959 gpa_t addr
, int len
)
2961 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2967 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2968 kvm_io_bus_sort_cmp
, NULL
);
2973 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2974 gpa_t addr
, int len
)
2976 struct kvm_io_range
*range
, key
;
2979 key
= (struct kvm_io_range
) {
2984 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2985 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2989 off
= range
- bus
->range
;
2991 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
2997 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
2998 struct kvm_io_range
*range
, const void *val
)
3002 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3006 while (idx
< bus
->dev_count
&&
3007 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3008 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3017 /* kvm_io_bus_write - called under kvm->slots_lock */
3018 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3019 int len
, const void *val
)
3021 struct kvm_io_bus
*bus
;
3022 struct kvm_io_range range
;
3025 range
= (struct kvm_io_range
) {
3030 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3031 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3032 return r
< 0 ? r
: 0;
3035 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3036 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3037 gpa_t addr
, int len
, const void *val
, long cookie
)
3039 struct kvm_io_bus
*bus
;
3040 struct kvm_io_range range
;
3042 range
= (struct kvm_io_range
) {
3047 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3049 /* First try the device referenced by cookie. */
3050 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3051 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3052 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3057 * cookie contained garbage; fall back to search and return the
3058 * correct cookie value.
3060 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3063 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3064 struct kvm_io_range
*range
, void *val
)
3068 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3072 while (idx
< bus
->dev_count
&&
3073 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3074 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3082 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3084 /* kvm_io_bus_read - called under kvm->slots_lock */
3085 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3088 struct kvm_io_bus
*bus
;
3089 struct kvm_io_range range
;
3092 range
= (struct kvm_io_range
) {
3097 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3098 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3099 return r
< 0 ? r
: 0;
3103 /* Caller must hold slots_lock. */
3104 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3105 int len
, struct kvm_io_device
*dev
)
3107 struct kvm_io_bus
*new_bus
, *bus
;
3109 bus
= kvm
->buses
[bus_idx
];
3110 /* exclude ioeventfd which is limited by maximum fd */
3111 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3114 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3115 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3118 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3119 sizeof(struct kvm_io_range
)));
3120 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3121 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3122 synchronize_srcu_expedited(&kvm
->srcu
);
3128 /* Caller must hold slots_lock. */
3129 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3130 struct kvm_io_device
*dev
)
3133 struct kvm_io_bus
*new_bus
, *bus
;
3135 bus
= kvm
->buses
[bus_idx
];
3137 for (i
= 0; i
< bus
->dev_count
; i
++)
3138 if (bus
->range
[i
].dev
== dev
) {
3146 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3147 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3151 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3152 new_bus
->dev_count
--;
3153 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3154 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3156 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3157 synchronize_srcu_expedited(&kvm
->srcu
);
3162 static struct notifier_block kvm_cpu_notifier
= {
3163 .notifier_call
= kvm_cpu_hotplug
,
3166 static int vm_stat_get(void *_offset
, u64
*val
)
3168 unsigned offset
= (long)_offset
;
3172 spin_lock(&kvm_lock
);
3173 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3174 *val
+= *(u32
*)((void *)kvm
+ offset
);
3175 spin_unlock(&kvm_lock
);
3179 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3181 static int vcpu_stat_get(void *_offset
, u64
*val
)
3183 unsigned offset
= (long)_offset
;
3185 struct kvm_vcpu
*vcpu
;
3189 spin_lock(&kvm_lock
);
3190 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3191 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3192 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3194 spin_unlock(&kvm_lock
);
3198 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3200 static const struct file_operations
*stat_fops
[] = {
3201 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3202 [KVM_STAT_VM
] = &vm_stat_fops
,
3205 static int kvm_init_debug(void)
3208 struct kvm_stats_debugfs_item
*p
;
3210 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3211 if (kvm_debugfs_dir
== NULL
)
3214 for (p
= debugfs_entries
; p
->name
; ++p
) {
3215 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3216 (void *)(long)p
->offset
,
3217 stat_fops
[p
->kind
]);
3218 if (p
->dentry
== NULL
)
3225 debugfs_remove_recursive(kvm_debugfs_dir
);
3230 static void kvm_exit_debug(void)
3232 struct kvm_stats_debugfs_item
*p
;
3234 for (p
= debugfs_entries
; p
->name
; ++p
)
3235 debugfs_remove(p
->dentry
);
3236 debugfs_remove(kvm_debugfs_dir
);
3239 static int kvm_suspend(void)
3241 if (kvm_usage_count
)
3242 hardware_disable_nolock(NULL
);
3246 static void kvm_resume(void)
3248 if (kvm_usage_count
) {
3249 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3250 hardware_enable_nolock(NULL
);
3254 static struct syscore_ops kvm_syscore_ops
= {
3255 .suspend
= kvm_suspend
,
3256 .resume
= kvm_resume
,
3260 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3262 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3265 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3267 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3269 if (vcpu
->preempted
)
3270 vcpu
->preempted
= false;
3272 kvm_arch_sched_in(vcpu
, cpu
);
3274 kvm_arch_vcpu_load(vcpu
, cpu
);
3277 static void kvm_sched_out(struct preempt_notifier
*pn
,
3278 struct task_struct
*next
)
3280 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3282 if (current
->state
== TASK_RUNNING
)
3283 vcpu
->preempted
= true;
3284 kvm_arch_vcpu_put(vcpu
);
3287 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3288 struct module
*module
)
3293 r
= kvm_arch_init(opaque
);
3298 * kvm_arch_init makes sure there's at most one caller
3299 * for architectures that support multiple implementations,
3300 * like intel and amd on x86.
3301 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3302 * conflicts in case kvm is already setup for another implementation.
3304 r
= kvm_irqfd_init();
3308 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3313 r
= kvm_arch_hardware_setup();
3317 for_each_online_cpu(cpu
) {
3318 smp_call_function_single(cpu
,
3319 kvm_arch_check_processor_compat
,
3325 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3328 register_reboot_notifier(&kvm_reboot_notifier
);
3330 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3332 vcpu_align
= __alignof__(struct kvm_vcpu
);
3333 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3335 if (!kvm_vcpu_cache
) {
3340 r
= kvm_async_pf_init();
3344 kvm_chardev_ops
.owner
= module
;
3345 kvm_vm_fops
.owner
= module
;
3346 kvm_vcpu_fops
.owner
= module
;
3348 r
= misc_register(&kvm_dev
);
3350 pr_err("kvm: misc device register failed\n");
3354 register_syscore_ops(&kvm_syscore_ops
);
3356 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3357 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3359 r
= kvm_init_debug();
3361 pr_err("kvm: create debugfs files failed\n");
3365 r
= kvm_vfio_ops_init();
3371 unregister_syscore_ops(&kvm_syscore_ops
);
3372 misc_deregister(&kvm_dev
);
3374 kvm_async_pf_deinit();
3376 kmem_cache_destroy(kvm_vcpu_cache
);
3378 unregister_reboot_notifier(&kvm_reboot_notifier
);
3379 unregister_cpu_notifier(&kvm_cpu_notifier
);
3382 kvm_arch_hardware_unsetup();
3384 free_cpumask_var(cpus_hardware_enabled
);
3392 EXPORT_SYMBOL_GPL(kvm_init
);
3397 misc_deregister(&kvm_dev
);
3398 kmem_cache_destroy(kvm_vcpu_cache
);
3399 kvm_async_pf_deinit();
3400 unregister_syscore_ops(&kvm_syscore_ops
);
3401 unregister_reboot_notifier(&kvm_reboot_notifier
);
3402 unregister_cpu_notifier(&kvm_cpu_notifier
);
3403 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3404 kvm_arch_hardware_unsetup();
3407 free_cpumask_var(cpus_hardware_enabled
);
3408 kvm_vfio_ops_exit();
3410 EXPORT_SYMBOL_GPL(kvm_exit
);