2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
7 * Copyright (C) 2006 Qumranet, Inc.
8 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
11 * Avi Kivity <avi@qumranet.com>
12 * Yaniv Kamay <yaniv@qumranet.com>
14 * This work is licensed under the terms of the GNU GPL, version 2. See
15 * the COPYING file in the top-level directory.
21 #include <linux/kvm_host.h>
22 #include <linux/kvm.h>
23 #include <linux/module.h>
24 #include <linux/errno.h>
25 #include <linux/percpu.h>
27 #include <linux/miscdevice.h>
28 #include <linux/vmalloc.h>
29 #include <linux/reboot.h>
30 #include <linux/debugfs.h>
31 #include <linux/highmem.h>
32 #include <linux/file.h>
33 #include <linux/syscore_ops.h>
34 #include <linux/cpu.h>
35 #include <linux/sched.h>
36 #include <linux/cpumask.h>
37 #include <linux/smp.h>
38 #include <linux/anon_inodes.h>
39 #include <linux/profile.h>
40 #include <linux/kvm_para.h>
41 #include <linux/pagemap.h>
42 #include <linux/mman.h>
43 #include <linux/swap.h>
44 #include <linux/bitops.h>
45 #include <linux/spinlock.h>
46 #include <linux/compat.h>
47 #include <linux/srcu.h>
48 #include <linux/hugetlb.h>
49 #include <linux/slab.h>
50 #include <linux/sort.h>
51 #include <linux/bsearch.h>
53 #include <asm/processor.h>
55 #include <asm/ioctl.h>
56 #include <asm/uaccess.h>
57 #include <asm/pgtable.h>
59 #include "coalesced_mmio.h"
63 #define CREATE_TRACE_POINTS
64 #include <trace/events/kvm.h>
66 MODULE_AUTHOR("Qumranet");
67 MODULE_LICENSE("GPL");
69 unsigned int halt_poll_ns
= 0;
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
= 0;
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 void kvm_kvfree(const void *addr
)
544 if (is_vmalloc_addr(addr
))
550 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
552 if (!memslot
->dirty_bitmap
)
555 kvm_kvfree(memslot
->dirty_bitmap
);
556 memslot
->dirty_bitmap
= NULL
;
560 * Free any memory in @free but not in @dont.
562 static void kvm_free_physmem_slot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
563 struct kvm_memory_slot
*dont
)
565 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
566 kvm_destroy_dirty_bitmap(free
);
568 kvm_arch_free_memslot(kvm
, free
, dont
);
573 static void kvm_free_physmem(struct kvm
*kvm
)
575 struct kvm_memslots
*slots
= kvm
->memslots
;
576 struct kvm_memory_slot
*memslot
;
578 kvm_for_each_memslot(memslot
, slots
)
579 kvm_free_physmem_slot(kvm
, memslot
, NULL
);
581 kfree(kvm
->memslots
);
584 static void kvm_destroy_devices(struct kvm
*kvm
)
586 struct list_head
*node
, *tmp
;
588 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
589 struct kvm_device
*dev
=
590 list_entry(node
, struct kvm_device
, vm_node
);
593 dev
->ops
->destroy(dev
);
597 static void kvm_destroy_vm(struct kvm
*kvm
)
600 struct mm_struct
*mm
= kvm
->mm
;
602 kvm_arch_sync_events(kvm
);
603 spin_lock(&kvm_lock
);
604 list_del(&kvm
->vm_list
);
605 spin_unlock(&kvm_lock
);
606 kvm_free_irq_routing(kvm
);
607 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
608 kvm_io_bus_destroy(kvm
->buses
[i
]);
609 kvm_coalesced_mmio_free(kvm
);
610 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
611 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
613 kvm_arch_flush_shadow_all(kvm
);
615 kvm_arch_destroy_vm(kvm
);
616 kvm_destroy_devices(kvm
);
617 kvm_free_physmem(kvm
);
618 cleanup_srcu_struct(&kvm
->irq_srcu
);
619 cleanup_srcu_struct(&kvm
->srcu
);
620 kvm_arch_free_vm(kvm
);
621 hardware_disable_all();
625 void kvm_get_kvm(struct kvm
*kvm
)
627 atomic_inc(&kvm
->users_count
);
629 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
631 void kvm_put_kvm(struct kvm
*kvm
)
633 if (atomic_dec_and_test(&kvm
->users_count
))
636 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
639 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
641 struct kvm
*kvm
= filp
->private_data
;
643 kvm_irqfd_release(kvm
);
650 * Allocation size is twice as large as the actual dirty bitmap size.
651 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
653 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
655 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
657 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
658 if (!memslot
->dirty_bitmap
)
665 * Insert memslot and re-sort memslots based on their GFN,
666 * so binary search could be used to lookup GFN.
667 * Sorting algorithm takes advantage of having initially
668 * sorted array and known changed memslot position.
670 static void update_memslots(struct kvm_memslots
*slots
,
671 struct kvm_memory_slot
*new)
674 int i
= slots
->id_to_index
[id
];
675 struct kvm_memory_slot
*mslots
= slots
->memslots
;
677 WARN_ON(mslots
[i
].id
!= id
);
679 WARN_ON(!mslots
[i
].npages
);
682 if (mslots
[i
].npages
)
685 if (!mslots
[i
].npages
)
689 while (i
< KVM_MEM_SLOTS_NUM
- 1 &&
690 new->base_gfn
<= mslots
[i
+ 1].base_gfn
) {
691 if (!mslots
[i
+ 1].npages
)
693 mslots
[i
] = mslots
[i
+ 1];
694 slots
->id_to_index
[mslots
[i
].id
] = i
;
699 * The ">=" is needed when creating a slot with base_gfn == 0,
700 * so that it moves before all those with base_gfn == npages == 0.
702 * On the other hand, if new->npages is zero, the above loop has
703 * already left i pointing to the beginning of the empty part of
704 * mslots, and the ">=" would move the hole backwards in this
705 * case---which is wrong. So skip the loop when deleting a slot.
709 new->base_gfn
>= mslots
[i
- 1].base_gfn
) {
710 mslots
[i
] = mslots
[i
- 1];
711 slots
->id_to_index
[mslots
[i
].id
] = i
;
715 WARN_ON_ONCE(i
!= slots
->used_slots
);
718 slots
->id_to_index
[mslots
[i
].id
] = i
;
721 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
723 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
725 #ifdef __KVM_HAVE_READONLY_MEM
726 valid_flags
|= KVM_MEM_READONLY
;
729 if (mem
->flags
& ~valid_flags
)
735 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
736 struct kvm_memslots
*slots
)
738 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
741 * Set the low bit in the generation, which disables SPTE caching
742 * until the end of synchronize_srcu_expedited.
744 WARN_ON(old_memslots
->generation
& 1);
745 slots
->generation
= old_memslots
->generation
+ 1;
747 rcu_assign_pointer(kvm
->memslots
, slots
);
748 synchronize_srcu_expedited(&kvm
->srcu
);
751 * Increment the new memslot generation a second time. This prevents
752 * vm exits that race with memslot updates from caching a memslot
753 * generation that will (potentially) be valid forever.
757 kvm_arch_memslots_updated(kvm
);
763 * Allocate some memory and give it an address in the guest physical address
766 * Discontiguous memory is allowed, mostly for framebuffers.
768 * Must be called holding kvm->slots_lock for write.
770 int __kvm_set_memory_region(struct kvm
*kvm
,
771 struct kvm_userspace_memory_region
*mem
)
775 unsigned long npages
;
776 struct kvm_memory_slot
*slot
;
777 struct kvm_memory_slot old
, new;
778 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
779 enum kvm_mr_change change
;
781 r
= check_memory_region_flags(mem
);
786 /* General sanity checks */
787 if (mem
->memory_size
& (PAGE_SIZE
- 1))
789 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
791 /* We can read the guest memory with __xxx_user() later on. */
792 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
793 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
794 !access_ok(VERIFY_WRITE
,
795 (void __user
*)(unsigned long)mem
->userspace_addr
,
798 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
800 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
803 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
804 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
805 npages
= mem
->memory_size
>> PAGE_SHIFT
;
807 if (npages
> KVM_MEM_MAX_NR_PAGES
)
811 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
816 new.base_gfn
= base_gfn
;
818 new.flags
= mem
->flags
;
822 change
= KVM_MR_CREATE
;
823 else { /* Modify an existing slot. */
824 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
825 (npages
!= old
.npages
) ||
826 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
829 if (base_gfn
!= old
.base_gfn
)
830 change
= KVM_MR_MOVE
;
831 else if (new.flags
!= old
.flags
)
832 change
= KVM_MR_FLAGS_ONLY
;
833 else { /* Nothing to change. */
838 } else if (old
.npages
) {
839 change
= KVM_MR_DELETE
;
840 } else /* Modify a non-existent slot: disallowed. */
843 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
844 /* Check for overlaps */
846 kvm_for_each_memslot(slot
, kvm
->memslots
) {
847 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
848 (slot
->id
== mem
->slot
))
850 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
851 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
856 /* Free page dirty bitmap if unneeded */
857 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
858 new.dirty_bitmap
= NULL
;
861 if (change
== KVM_MR_CREATE
) {
862 new.userspace_addr
= mem
->userspace_addr
;
864 if (kvm_arch_create_memslot(kvm
, &new, npages
))
868 /* Allocate page dirty bitmap if needed */
869 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
870 if (kvm_create_dirty_bitmap(&new) < 0)
874 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
879 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
880 slot
= id_to_memslot(slots
, mem
->slot
);
881 slot
->flags
|= KVM_MEMSLOT_INVALID
;
883 old_memslots
= install_new_memslots(kvm
, slots
);
885 /* slot was deleted or moved, clear iommu mapping */
886 kvm_iommu_unmap_pages(kvm
, &old
);
887 /* From this point no new shadow pages pointing to a deleted,
888 * or moved, memslot will be created.
890 * validation of sp->gfn happens in:
891 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
892 * - kvm_is_visible_gfn (mmu_check_roots)
894 kvm_arch_flush_shadow_memslot(kvm
, slot
);
897 * We can re-use the old_memslots from above, the only difference
898 * from the currently installed memslots is the invalid flag. This
899 * will get overwritten by update_memslots anyway.
901 slots
= old_memslots
;
904 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
908 /* actual memory is freed via old in kvm_free_physmem_slot below */
909 if (change
== KVM_MR_DELETE
) {
910 new.dirty_bitmap
= NULL
;
911 memset(&new.arch
, 0, sizeof(new.arch
));
914 update_memslots(slots
, &new);
915 old_memslots
= install_new_memslots(kvm
, slots
);
917 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
919 kvm_free_physmem_slot(kvm
, &old
, &new);
923 * IOMMU mapping: New slots need to be mapped. Old slots need to be
924 * un-mapped and re-mapped if their base changes. Since base change
925 * unmapping is handled above with slot deletion, mapping alone is
926 * needed here. Anything else the iommu might care about for existing
927 * slots (size changes, userspace addr changes and read-only flag
928 * changes) is disallowed above, so any other attribute changes getting
929 * here can be skipped.
931 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
932 r
= kvm_iommu_map_pages(kvm
, &new);
941 kvm_free_physmem_slot(kvm
, &new, &old
);
945 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
947 int kvm_set_memory_region(struct kvm
*kvm
,
948 struct kvm_userspace_memory_region
*mem
)
952 mutex_lock(&kvm
->slots_lock
);
953 r
= __kvm_set_memory_region(kvm
, mem
);
954 mutex_unlock(&kvm
->slots_lock
);
957 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
959 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
960 struct kvm_userspace_memory_region
*mem
)
962 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
964 return kvm_set_memory_region(kvm
, mem
);
967 int kvm_get_dirty_log(struct kvm
*kvm
,
968 struct kvm_dirty_log
*log
, int *is_dirty
)
970 struct kvm_memory_slot
*memslot
;
973 unsigned long any
= 0;
976 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
979 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
981 if (!memslot
->dirty_bitmap
)
984 n
= kvm_dirty_bitmap_bytes(memslot
);
986 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
987 any
= memslot
->dirty_bitmap
[i
];
990 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
1000 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
1002 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1004 * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1005 * are dirty write protect them for next write.
1006 * @kvm: pointer to kvm instance
1007 * @log: slot id and address to which we copy the log
1008 * @is_dirty: flag set if any page is dirty
1010 * We need to keep it in mind that VCPU threads can write to the bitmap
1011 * concurrently. So, to avoid losing track of dirty pages we keep the
1014 * 1. Take a snapshot of the bit and clear it if needed.
1015 * 2. Write protect the corresponding page.
1016 * 3. Copy the snapshot to the userspace.
1017 * 4. Upon return caller flushes TLB's if needed.
1019 * Between 2 and 4, the guest may write to the page using the remaining TLB
1020 * entry. This is not a problem because the page is reported dirty using
1021 * the snapshot taken before and step 4 ensures that writes done after
1022 * exiting to userspace will be logged for the next call.
1025 int kvm_get_dirty_log_protect(struct kvm
*kvm
,
1026 struct kvm_dirty_log
*log
, bool *is_dirty
)
1028 struct kvm_memory_slot
*memslot
;
1031 unsigned long *dirty_bitmap
;
1032 unsigned long *dirty_bitmap_buffer
;
1035 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
1038 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
1040 dirty_bitmap
= memslot
->dirty_bitmap
;
1045 n
= kvm_dirty_bitmap_bytes(memslot
);
1047 dirty_bitmap_buffer
= dirty_bitmap
+ n
/ sizeof(long);
1048 memset(dirty_bitmap_buffer
, 0, n
);
1050 spin_lock(&kvm
->mmu_lock
);
1052 for (i
= 0; i
< n
/ sizeof(long); i
++) {
1056 if (!dirty_bitmap
[i
])
1061 mask
= xchg(&dirty_bitmap
[i
], 0);
1062 dirty_bitmap_buffer
[i
] = mask
;
1064 offset
= i
* BITS_PER_LONG
;
1065 kvm_arch_mmu_enable_log_dirty_pt_masked(kvm
, memslot
, offset
,
1069 spin_unlock(&kvm
->mmu_lock
);
1072 if (copy_to_user(log
->dirty_bitmap
, dirty_bitmap_buffer
, n
))
1079 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect
);
1082 bool kvm_largepages_enabled(void)
1084 return largepages_enabled
;
1087 void kvm_disable_largepages(void)
1089 largepages_enabled
= false;
1091 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
1093 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
1095 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
1097 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
1099 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1101 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1103 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1104 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1109 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1111 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1113 struct vm_area_struct
*vma
;
1114 unsigned long addr
, size
;
1118 addr
= gfn_to_hva(kvm
, gfn
);
1119 if (kvm_is_error_hva(addr
))
1122 down_read(¤t
->mm
->mmap_sem
);
1123 vma
= find_vma(current
->mm
, addr
);
1127 size
= vma_kernel_pagesize(vma
);
1130 up_read(¤t
->mm
->mmap_sem
);
1135 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1137 return slot
->flags
& KVM_MEM_READONLY
;
1140 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1141 gfn_t
*nr_pages
, bool write
)
1143 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1144 return KVM_HVA_ERR_BAD
;
1146 if (memslot_is_readonly(slot
) && write
)
1147 return KVM_HVA_ERR_RO_BAD
;
1150 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1152 return __gfn_to_hva_memslot(slot
, gfn
);
1155 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1158 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1161 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1164 return gfn_to_hva_many(slot
, gfn
, NULL
);
1166 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1168 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1170 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1172 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1175 * If writable is set to false, the hva returned by this function is only
1176 * allowed to be read.
1178 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot
*slot
,
1179 gfn_t gfn
, bool *writable
)
1181 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1183 if (!kvm_is_error_hva(hva
) && writable
)
1184 *writable
= !memslot_is_readonly(slot
);
1189 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1191 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1193 return gfn_to_hva_memslot_prot(slot
, gfn
, writable
);
1196 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1198 return __copy_from_user(data
, hva
, len
);
1201 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1203 return __copy_from_user_inatomic(data
, hva
, len
);
1206 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1207 unsigned long start
, int write
, struct page
**page
)
1209 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1212 flags
|= FOLL_WRITE
;
1214 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1217 static inline int check_user_page_hwpoison(unsigned long addr
)
1219 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1221 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1222 flags
, NULL
, NULL
, NULL
);
1223 return rc
== -EHWPOISON
;
1227 * The atomic path to get the writable pfn which will be stored in @pfn,
1228 * true indicates success, otherwise false is returned.
1230 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1231 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1233 struct page
*page
[1];
1236 if (!(async
|| atomic
))
1240 * Fast pin a writable pfn only if it is a write fault request
1241 * or the caller allows to map a writable pfn for a read fault
1244 if (!(write_fault
|| writable
))
1247 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1249 *pfn
= page_to_pfn(page
[0]);
1260 * The slow path to get the pfn of the specified host virtual address,
1261 * 1 indicates success, -errno is returned if error is detected.
1263 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1264 bool *writable
, pfn_t
*pfn
)
1266 struct page
*page
[1];
1272 *writable
= write_fault
;
1275 down_read(¤t
->mm
->mmap_sem
);
1276 npages
= get_user_page_nowait(current
, current
->mm
,
1277 addr
, write_fault
, page
);
1278 up_read(¤t
->mm
->mmap_sem
);
1280 npages
= __get_user_pages_unlocked(current
, current
->mm
, addr
, 1,
1281 write_fault
, 0, page
,
1282 FOLL_TOUCH
|FOLL_HWPOISON
);
1286 /* map read fault as writable if possible */
1287 if (unlikely(!write_fault
) && writable
) {
1288 struct page
*wpage
[1];
1290 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1299 *pfn
= page_to_pfn(page
[0]);
1303 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1305 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1308 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1315 * Pin guest page in memory and return its pfn.
1316 * @addr: host virtual address which maps memory to the guest
1317 * @atomic: whether this function can sleep
1318 * @async: whether this function need to wait IO complete if the
1319 * host page is not in the memory
1320 * @write_fault: whether we should get a writable host page
1321 * @writable: whether it allows to map a writable host page for !@write_fault
1323 * The function will map a writable host page for these two cases:
1324 * 1): @write_fault = true
1325 * 2): @write_fault = false && @writable, @writable will tell the caller
1326 * whether the mapping is writable.
1328 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1329 bool write_fault
, bool *writable
)
1331 struct vm_area_struct
*vma
;
1335 /* we can do it either atomically or asynchronously, not both */
1336 BUG_ON(atomic
&& async
);
1338 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1342 return KVM_PFN_ERR_FAULT
;
1344 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1348 down_read(¤t
->mm
->mmap_sem
);
1349 if (npages
== -EHWPOISON
||
1350 (!async
&& check_user_page_hwpoison(addr
))) {
1351 pfn
= KVM_PFN_ERR_HWPOISON
;
1355 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1358 pfn
= KVM_PFN_ERR_FAULT
;
1359 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1360 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1362 BUG_ON(!kvm_is_reserved_pfn(pfn
));
1364 if (async
&& vma_is_valid(vma
, write_fault
))
1366 pfn
= KVM_PFN_ERR_FAULT
;
1369 up_read(¤t
->mm
->mmap_sem
);
1374 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1375 bool *async
, bool write_fault
, bool *writable
)
1377 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1379 if (addr
== KVM_HVA_ERR_RO_BAD
)
1380 return KVM_PFN_ERR_RO_FAULT
;
1382 if (kvm_is_error_hva(addr
))
1383 return KVM_PFN_NOSLOT
;
1385 /* Do not map writable pfn in the readonly memslot. */
1386 if (writable
&& memslot_is_readonly(slot
)) {
1391 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1395 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1396 bool write_fault
, bool *writable
)
1398 struct kvm_memory_slot
*slot
;
1403 slot
= gfn_to_memslot(kvm
, gfn
);
1405 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1409 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1411 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1413 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1415 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1416 bool write_fault
, bool *writable
)
1418 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1420 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1422 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1424 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1426 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1428 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1431 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1433 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1435 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1437 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1440 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1442 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1444 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1446 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1452 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1453 if (kvm_is_error_hva(addr
))
1456 if (entry
< nr_pages
)
1459 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1461 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1463 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1465 if (is_error_noslot_pfn(pfn
))
1466 return KVM_ERR_PTR_BAD_PAGE
;
1468 if (kvm_is_reserved_pfn(pfn
)) {
1470 return KVM_ERR_PTR_BAD_PAGE
;
1473 return pfn_to_page(pfn
);
1476 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1480 pfn
= gfn_to_pfn(kvm
, gfn
);
1482 return kvm_pfn_to_page(pfn
);
1485 EXPORT_SYMBOL_GPL(gfn_to_page
);
1487 void kvm_release_page_clean(struct page
*page
)
1489 WARN_ON(is_error_page(page
));
1491 kvm_release_pfn_clean(page_to_pfn(page
));
1493 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1495 void kvm_release_pfn_clean(pfn_t pfn
)
1497 if (!is_error_noslot_pfn(pfn
) && !kvm_is_reserved_pfn(pfn
))
1498 put_page(pfn_to_page(pfn
));
1500 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1502 void kvm_release_page_dirty(struct page
*page
)
1504 WARN_ON(is_error_page(page
));
1506 kvm_release_pfn_dirty(page_to_pfn(page
));
1508 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1510 static void kvm_release_pfn_dirty(pfn_t pfn
)
1512 kvm_set_pfn_dirty(pfn
);
1513 kvm_release_pfn_clean(pfn
);
1516 void kvm_set_pfn_dirty(pfn_t pfn
)
1518 if (!kvm_is_reserved_pfn(pfn
)) {
1519 struct page
*page
= pfn_to_page(pfn
);
1520 if (!PageReserved(page
))
1524 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1526 void kvm_set_pfn_accessed(pfn_t pfn
)
1528 if (!kvm_is_reserved_pfn(pfn
))
1529 mark_page_accessed(pfn_to_page(pfn
));
1531 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1533 void kvm_get_pfn(pfn_t pfn
)
1535 if (!kvm_is_reserved_pfn(pfn
))
1536 get_page(pfn_to_page(pfn
));
1538 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1540 static int next_segment(unsigned long len
, int offset
)
1542 if (len
> PAGE_SIZE
- offset
)
1543 return PAGE_SIZE
- offset
;
1548 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1554 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1555 if (kvm_is_error_hva(addr
))
1557 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1562 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1564 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1566 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1568 int offset
= offset_in_page(gpa
);
1571 while ((seg
= next_segment(len
, offset
)) != 0) {
1572 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1582 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1584 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1589 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1590 int offset
= offset_in_page(gpa
);
1592 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1593 if (kvm_is_error_hva(addr
))
1595 pagefault_disable();
1596 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1602 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1604 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1605 int offset
, int len
)
1610 addr
= gfn_to_hva(kvm
, gfn
);
1611 if (kvm_is_error_hva(addr
))
1613 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1616 mark_page_dirty(kvm
, gfn
);
1619 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1621 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1624 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1626 int offset
= offset_in_page(gpa
);
1629 while ((seg
= next_segment(len
, offset
)) != 0) {
1630 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1640 EXPORT_SYMBOL_GPL(kvm_write_guest
);
1642 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1643 gpa_t gpa
, unsigned long len
)
1645 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1646 int offset
= offset_in_page(gpa
);
1647 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1648 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1649 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1650 gfn_t nr_pages_avail
;
1653 ghc
->generation
= slots
->generation
;
1655 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1656 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1657 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1661 * If the requested region crosses two memslots, we still
1662 * verify that the entire region is valid here.
1664 while (start_gfn
<= end_gfn
) {
1665 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1666 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1668 if (kvm_is_error_hva(ghc
->hva
))
1670 start_gfn
+= nr_pages_avail
;
1672 /* Use the slow path for cross page reads and writes. */
1673 ghc
->memslot
= NULL
;
1677 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1679 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1680 void *data
, unsigned long len
)
1682 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1685 BUG_ON(len
> ghc
->len
);
1687 if (slots
->generation
!= ghc
->generation
)
1688 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1690 if (unlikely(!ghc
->memslot
))
1691 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1693 if (kvm_is_error_hva(ghc
->hva
))
1696 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1699 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1703 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1705 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1706 void *data
, unsigned long len
)
1708 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1711 BUG_ON(len
> ghc
->len
);
1713 if (slots
->generation
!= ghc
->generation
)
1714 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1716 if (unlikely(!ghc
->memslot
))
1717 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1719 if (kvm_is_error_hva(ghc
->hva
))
1722 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1728 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1730 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1732 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1734 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1736 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1738 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1740 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1742 int offset
= offset_in_page(gpa
);
1745 while ((seg
= next_segment(len
, offset
)) != 0) {
1746 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1755 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1757 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
1758 struct kvm_memory_slot
*memslot
,
1761 if (memslot
&& memslot
->dirty_bitmap
) {
1762 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1764 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1768 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1770 struct kvm_memory_slot
*memslot
;
1772 memslot
= gfn_to_memslot(kvm
, gfn
);
1773 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1775 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1777 static int kvm_vcpu_check_block(struct kvm_vcpu
*vcpu
)
1779 if (kvm_arch_vcpu_runnable(vcpu
)) {
1780 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1783 if (kvm_cpu_has_pending_timer(vcpu
))
1785 if (signal_pending(current
))
1792 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1794 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1798 bool waited
= false;
1800 start
= cur
= ktime_get();
1802 ktime_t stop
= ktime_add_ns(ktime_get(), halt_poll_ns
);
1805 * This sets KVM_REQ_UNHALT if an interrupt
1808 if (kvm_vcpu_check_block(vcpu
) < 0) {
1809 ++vcpu
->stat
.halt_successful_poll
;
1813 } while (single_task_running() && ktime_before(cur
, stop
));
1817 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1819 if (kvm_vcpu_check_block(vcpu
) < 0)
1826 finish_wait(&vcpu
->wq
, &wait
);
1830 trace_kvm_vcpu_wakeup(ktime_to_ns(cur
) - ktime_to_ns(start
), waited
);
1832 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1836 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1838 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1841 int cpu
= vcpu
->cpu
;
1842 wait_queue_head_t
*wqp
;
1844 wqp
= kvm_arch_vcpu_wq(vcpu
);
1845 if (waitqueue_active(wqp
)) {
1846 wake_up_interruptible(wqp
);
1847 ++vcpu
->stat
.halt_wakeup
;
1851 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1852 if (kvm_arch_vcpu_should_kick(vcpu
))
1853 smp_send_reschedule(cpu
);
1856 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1857 #endif /* !CONFIG_S390 */
1859 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1862 struct task_struct
*task
= NULL
;
1866 pid
= rcu_dereference(target
->pid
);
1868 task
= get_pid_task(pid
, PIDTYPE_PID
);
1872 ret
= yield_to(task
, 1);
1873 put_task_struct(task
);
1877 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1880 * Helper that checks whether a VCPU is eligible for directed yield.
1881 * Most eligible candidate to yield is decided by following heuristics:
1883 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1884 * (preempted lock holder), indicated by @in_spin_loop.
1885 * Set at the beiginning and cleared at the end of interception/PLE handler.
1887 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1888 * chance last time (mostly it has become eligible now since we have probably
1889 * yielded to lockholder in last iteration. This is done by toggling
1890 * @dy_eligible each time a VCPU checked for eligibility.)
1892 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1893 * to preempted lock-holder could result in wrong VCPU selection and CPU
1894 * burning. Giving priority for a potential lock-holder increases lock
1897 * Since algorithm is based on heuristics, accessing another VCPU data without
1898 * locking does not harm. It may result in trying to yield to same VCPU, fail
1899 * and continue with next VCPU and so on.
1901 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1903 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1906 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1907 vcpu
->spin_loop
.dy_eligible
;
1909 if (vcpu
->spin_loop
.in_spin_loop
)
1910 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1918 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1920 struct kvm
*kvm
= me
->kvm
;
1921 struct kvm_vcpu
*vcpu
;
1922 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1928 kvm_vcpu_set_in_spin_loop(me
, true);
1930 * We boost the priority of a VCPU that is runnable but not
1931 * currently running, because it got preempted by something
1932 * else and called schedule in __vcpu_run. Hopefully that
1933 * VCPU is holding the lock that we need and will release it.
1934 * We approximate round-robin by starting at the last boosted VCPU.
1936 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1937 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1938 if (!pass
&& i
<= last_boosted_vcpu
) {
1939 i
= last_boosted_vcpu
;
1941 } else if (pass
&& i
> last_boosted_vcpu
)
1943 if (!ACCESS_ONCE(vcpu
->preempted
))
1947 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
1949 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1952 yielded
= kvm_vcpu_yield_to(vcpu
);
1954 kvm
->last_boosted_vcpu
= i
;
1956 } else if (yielded
< 0) {
1963 kvm_vcpu_set_in_spin_loop(me
, false);
1965 /* Ensure vcpu is not eligible during next spinloop */
1966 kvm_vcpu_set_dy_eligible(me
, false);
1968 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1970 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1972 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1975 if (vmf
->pgoff
== 0)
1976 page
= virt_to_page(vcpu
->run
);
1978 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1979 page
= virt_to_page(vcpu
->arch
.pio_data
);
1981 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1982 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1983 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1986 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1992 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1993 .fault
= kvm_vcpu_fault
,
1996 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1998 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
2002 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
2004 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2006 kvm_put_kvm(vcpu
->kvm
);
2010 static struct file_operations kvm_vcpu_fops
= {
2011 .release
= kvm_vcpu_release
,
2012 .unlocked_ioctl
= kvm_vcpu_ioctl
,
2013 #ifdef CONFIG_KVM_COMPAT
2014 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
2016 .mmap
= kvm_vcpu_mmap
,
2017 .llseek
= noop_llseek
,
2021 * Allocates an inode for the vcpu.
2023 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
2025 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
2029 * Creates some virtual cpus. Good luck creating more than one.
2031 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
2034 struct kvm_vcpu
*vcpu
, *v
;
2036 if (id
>= KVM_MAX_VCPUS
)
2039 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
2041 return PTR_ERR(vcpu
);
2043 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
2045 r
= kvm_arch_vcpu_setup(vcpu
);
2049 mutex_lock(&kvm
->lock
);
2050 if (!kvm_vcpu_compatible(vcpu
)) {
2052 goto unlock_vcpu_destroy
;
2054 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
2056 goto unlock_vcpu_destroy
;
2059 kvm_for_each_vcpu(r
, v
, kvm
)
2060 if (v
->vcpu_id
== id
) {
2062 goto unlock_vcpu_destroy
;
2065 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
2067 /* Now it's all set up, let userspace reach it */
2069 r
= create_vcpu_fd(vcpu
);
2072 goto unlock_vcpu_destroy
;
2075 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
2077 atomic_inc(&kvm
->online_vcpus
);
2079 mutex_unlock(&kvm
->lock
);
2080 kvm_arch_vcpu_postcreate(vcpu
);
2083 unlock_vcpu_destroy
:
2084 mutex_unlock(&kvm
->lock
);
2086 kvm_arch_vcpu_destroy(vcpu
);
2090 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
2093 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
2094 vcpu
->sigset_active
= 1;
2095 vcpu
->sigset
= *sigset
;
2097 vcpu
->sigset_active
= 0;
2101 static long kvm_vcpu_ioctl(struct file
*filp
,
2102 unsigned int ioctl
, unsigned long arg
)
2104 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2105 void __user
*argp
= (void __user
*)arg
;
2107 struct kvm_fpu
*fpu
= NULL
;
2108 struct kvm_sregs
*kvm_sregs
= NULL
;
2110 if (vcpu
->kvm
->mm
!= current
->mm
)
2113 if (unlikely(_IOC_TYPE(ioctl
) != KVMIO
))
2116 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2118 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2119 * so vcpu_load() would break it.
2121 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
2122 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2126 r
= vcpu_load(vcpu
);
2134 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
2135 /* The thread running this VCPU changed. */
2136 struct pid
*oldpid
= vcpu
->pid
;
2137 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
2138 rcu_assign_pointer(vcpu
->pid
, newpid
);
2143 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
2144 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
2146 case KVM_GET_REGS
: {
2147 struct kvm_regs
*kvm_regs
;
2150 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2153 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2157 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2164 case KVM_SET_REGS
: {
2165 struct kvm_regs
*kvm_regs
;
2168 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2169 if (IS_ERR(kvm_regs
)) {
2170 r
= PTR_ERR(kvm_regs
);
2173 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2177 case KVM_GET_SREGS
: {
2178 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2182 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2186 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2191 case KVM_SET_SREGS
: {
2192 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2193 if (IS_ERR(kvm_sregs
)) {
2194 r
= PTR_ERR(kvm_sregs
);
2198 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2201 case KVM_GET_MP_STATE
: {
2202 struct kvm_mp_state mp_state
;
2204 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2208 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2213 case KVM_SET_MP_STATE
: {
2214 struct kvm_mp_state mp_state
;
2217 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2219 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2222 case KVM_TRANSLATE
: {
2223 struct kvm_translation tr
;
2226 if (copy_from_user(&tr
, argp
, sizeof tr
))
2228 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2232 if (copy_to_user(argp
, &tr
, sizeof tr
))
2237 case KVM_SET_GUEST_DEBUG
: {
2238 struct kvm_guest_debug dbg
;
2241 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2243 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2246 case KVM_SET_SIGNAL_MASK
: {
2247 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2248 struct kvm_signal_mask kvm_sigmask
;
2249 sigset_t sigset
, *p
;
2254 if (copy_from_user(&kvm_sigmask
, argp
,
2255 sizeof kvm_sigmask
))
2258 if (kvm_sigmask
.len
!= sizeof sigset
)
2261 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2266 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2270 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2274 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2278 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2284 fpu
= memdup_user(argp
, sizeof(*fpu
));
2290 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2294 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2303 #ifdef CONFIG_KVM_COMPAT
2304 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2305 unsigned int ioctl
, unsigned long arg
)
2307 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2308 void __user
*argp
= compat_ptr(arg
);
2311 if (vcpu
->kvm
->mm
!= current
->mm
)
2315 case KVM_SET_SIGNAL_MASK
: {
2316 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2317 struct kvm_signal_mask kvm_sigmask
;
2318 compat_sigset_t csigset
;
2323 if (copy_from_user(&kvm_sigmask
, argp
,
2324 sizeof kvm_sigmask
))
2327 if (kvm_sigmask
.len
!= sizeof csigset
)
2330 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2333 sigset_from_compat(&sigset
, &csigset
);
2334 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2336 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2340 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2348 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2349 int (*accessor
)(struct kvm_device
*dev
,
2350 struct kvm_device_attr
*attr
),
2353 struct kvm_device_attr attr
;
2358 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2361 return accessor(dev
, &attr
);
2364 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2367 struct kvm_device
*dev
= filp
->private_data
;
2370 case KVM_SET_DEVICE_ATTR
:
2371 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2372 case KVM_GET_DEVICE_ATTR
:
2373 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2374 case KVM_HAS_DEVICE_ATTR
:
2375 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2377 if (dev
->ops
->ioctl
)
2378 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2384 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2386 struct kvm_device
*dev
= filp
->private_data
;
2387 struct kvm
*kvm
= dev
->kvm
;
2393 static const struct file_operations kvm_device_fops
= {
2394 .unlocked_ioctl
= kvm_device_ioctl
,
2395 #ifdef CONFIG_KVM_COMPAT
2396 .compat_ioctl
= kvm_device_ioctl
,
2398 .release
= kvm_device_release
,
2401 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2403 if (filp
->f_op
!= &kvm_device_fops
)
2406 return filp
->private_data
;
2409 static struct kvm_device_ops
*kvm_device_ops_table
[KVM_DEV_TYPE_MAX
] = {
2410 #ifdef CONFIG_KVM_MPIC
2411 [KVM_DEV_TYPE_FSL_MPIC_20
] = &kvm_mpic_ops
,
2412 [KVM_DEV_TYPE_FSL_MPIC_42
] = &kvm_mpic_ops
,
2415 #ifdef CONFIG_KVM_XICS
2416 [KVM_DEV_TYPE_XICS
] = &kvm_xics_ops
,
2420 int kvm_register_device_ops(struct kvm_device_ops
*ops
, u32 type
)
2422 if (type
>= ARRAY_SIZE(kvm_device_ops_table
))
2425 if (kvm_device_ops_table
[type
] != NULL
)
2428 kvm_device_ops_table
[type
] = ops
;
2432 void kvm_unregister_device_ops(u32 type
)
2434 if (kvm_device_ops_table
[type
] != NULL
)
2435 kvm_device_ops_table
[type
] = NULL
;
2438 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2439 struct kvm_create_device
*cd
)
2441 struct kvm_device_ops
*ops
= NULL
;
2442 struct kvm_device
*dev
;
2443 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2446 if (cd
->type
>= ARRAY_SIZE(kvm_device_ops_table
))
2449 ops
= kvm_device_ops_table
[cd
->type
];
2456 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2463 ret
= ops
->create(dev
, cd
->type
);
2469 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2475 list_add(&dev
->vm_node
, &kvm
->devices
);
2481 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2484 case KVM_CAP_USER_MEMORY
:
2485 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2486 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2487 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2488 case KVM_CAP_SET_BOOT_CPU_ID
:
2490 case KVM_CAP_INTERNAL_ERROR_DATA
:
2491 #ifdef CONFIG_HAVE_KVM_MSI
2492 case KVM_CAP_SIGNAL_MSI
:
2494 #ifdef CONFIG_HAVE_KVM_IRQFD
2495 case KVM_CAP_IRQFD_RESAMPLE
:
2497 case KVM_CAP_CHECK_EXTENSION_VM
:
2499 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2500 case KVM_CAP_IRQ_ROUTING
:
2501 return KVM_MAX_IRQ_ROUTES
;
2506 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2509 static long kvm_vm_ioctl(struct file
*filp
,
2510 unsigned int ioctl
, unsigned long arg
)
2512 struct kvm
*kvm
= filp
->private_data
;
2513 void __user
*argp
= (void __user
*)arg
;
2516 if (kvm
->mm
!= current
->mm
)
2519 case KVM_CREATE_VCPU
:
2520 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2522 case KVM_SET_USER_MEMORY_REGION
: {
2523 struct kvm_userspace_memory_region kvm_userspace_mem
;
2526 if (copy_from_user(&kvm_userspace_mem
, argp
,
2527 sizeof kvm_userspace_mem
))
2530 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2533 case KVM_GET_DIRTY_LOG
: {
2534 struct kvm_dirty_log log
;
2537 if (copy_from_user(&log
, argp
, sizeof log
))
2539 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2542 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2543 case KVM_REGISTER_COALESCED_MMIO
: {
2544 struct kvm_coalesced_mmio_zone zone
;
2546 if (copy_from_user(&zone
, argp
, sizeof zone
))
2548 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2551 case KVM_UNREGISTER_COALESCED_MMIO
: {
2552 struct kvm_coalesced_mmio_zone zone
;
2554 if (copy_from_user(&zone
, argp
, sizeof zone
))
2556 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2561 struct kvm_irqfd data
;
2564 if (copy_from_user(&data
, argp
, sizeof data
))
2566 r
= kvm_irqfd(kvm
, &data
);
2569 case KVM_IOEVENTFD
: {
2570 struct kvm_ioeventfd data
;
2573 if (copy_from_user(&data
, argp
, sizeof data
))
2575 r
= kvm_ioeventfd(kvm
, &data
);
2578 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2579 case KVM_SET_BOOT_CPU_ID
:
2581 mutex_lock(&kvm
->lock
);
2582 if (atomic_read(&kvm
->online_vcpus
) != 0)
2585 kvm
->bsp_vcpu_id
= arg
;
2586 mutex_unlock(&kvm
->lock
);
2589 #ifdef CONFIG_HAVE_KVM_MSI
2590 case KVM_SIGNAL_MSI
: {
2594 if (copy_from_user(&msi
, argp
, sizeof msi
))
2596 r
= kvm_send_userspace_msi(kvm
, &msi
);
2600 #ifdef __KVM_HAVE_IRQ_LINE
2601 case KVM_IRQ_LINE_STATUS
:
2602 case KVM_IRQ_LINE
: {
2603 struct kvm_irq_level irq_event
;
2606 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2609 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2610 ioctl
== KVM_IRQ_LINE_STATUS
);
2615 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2616 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2624 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2625 case KVM_SET_GSI_ROUTING
: {
2626 struct kvm_irq_routing routing
;
2627 struct kvm_irq_routing __user
*urouting
;
2628 struct kvm_irq_routing_entry
*entries
;
2631 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2634 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2639 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2644 if (copy_from_user(entries
, urouting
->entries
,
2645 routing
.nr
* sizeof(*entries
)))
2646 goto out_free_irq_routing
;
2647 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2649 out_free_irq_routing
:
2653 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2654 case KVM_CREATE_DEVICE
: {
2655 struct kvm_create_device cd
;
2658 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2661 r
= kvm_ioctl_create_device(kvm
, &cd
);
2666 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2672 case KVM_CHECK_EXTENSION
:
2673 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2676 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2682 #ifdef CONFIG_KVM_COMPAT
2683 struct compat_kvm_dirty_log
{
2687 compat_uptr_t dirty_bitmap
; /* one bit per page */
2692 static long kvm_vm_compat_ioctl(struct file
*filp
,
2693 unsigned int ioctl
, unsigned long arg
)
2695 struct kvm
*kvm
= filp
->private_data
;
2698 if (kvm
->mm
!= current
->mm
)
2701 case KVM_GET_DIRTY_LOG
: {
2702 struct compat_kvm_dirty_log compat_log
;
2703 struct kvm_dirty_log log
;
2706 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2707 sizeof(compat_log
)))
2709 log
.slot
= compat_log
.slot
;
2710 log
.padding1
= compat_log
.padding1
;
2711 log
.padding2
= compat_log
.padding2
;
2712 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2714 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2718 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2726 static struct file_operations kvm_vm_fops
= {
2727 .release
= kvm_vm_release
,
2728 .unlocked_ioctl
= kvm_vm_ioctl
,
2729 #ifdef CONFIG_KVM_COMPAT
2730 .compat_ioctl
= kvm_vm_compat_ioctl
,
2732 .llseek
= noop_llseek
,
2735 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2740 kvm
= kvm_create_vm(type
);
2742 return PTR_ERR(kvm
);
2743 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2744 r
= kvm_coalesced_mmio_init(kvm
);
2750 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2757 static long kvm_dev_ioctl(struct file
*filp
,
2758 unsigned int ioctl
, unsigned long arg
)
2763 case KVM_GET_API_VERSION
:
2766 r
= KVM_API_VERSION
;
2769 r
= kvm_dev_ioctl_create_vm(arg
);
2771 case KVM_CHECK_EXTENSION
:
2772 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2774 case KVM_GET_VCPU_MMAP_SIZE
:
2777 r
= PAGE_SIZE
; /* struct kvm_run */
2779 r
+= PAGE_SIZE
; /* pio data page */
2781 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2782 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2785 case KVM_TRACE_ENABLE
:
2786 case KVM_TRACE_PAUSE
:
2787 case KVM_TRACE_DISABLE
:
2791 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2797 static struct file_operations kvm_chardev_ops
= {
2798 .unlocked_ioctl
= kvm_dev_ioctl
,
2799 .compat_ioctl
= kvm_dev_ioctl
,
2800 .llseek
= noop_llseek
,
2803 static struct miscdevice kvm_dev
= {
2809 static void hardware_enable_nolock(void *junk
)
2811 int cpu
= raw_smp_processor_id();
2814 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2817 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2819 r
= kvm_arch_hardware_enable();
2822 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2823 atomic_inc(&hardware_enable_failed
);
2824 printk(KERN_INFO
"kvm: enabling virtualization on "
2825 "CPU%d failed\n", cpu
);
2829 static void hardware_enable(void)
2831 raw_spin_lock(&kvm_count_lock
);
2832 if (kvm_usage_count
)
2833 hardware_enable_nolock(NULL
);
2834 raw_spin_unlock(&kvm_count_lock
);
2837 static void hardware_disable_nolock(void *junk
)
2839 int cpu
= raw_smp_processor_id();
2841 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2843 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2844 kvm_arch_hardware_disable();
2847 static void hardware_disable(void)
2849 raw_spin_lock(&kvm_count_lock
);
2850 if (kvm_usage_count
)
2851 hardware_disable_nolock(NULL
);
2852 raw_spin_unlock(&kvm_count_lock
);
2855 static void hardware_disable_all_nolock(void)
2857 BUG_ON(!kvm_usage_count
);
2860 if (!kvm_usage_count
)
2861 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2864 static void hardware_disable_all(void)
2866 raw_spin_lock(&kvm_count_lock
);
2867 hardware_disable_all_nolock();
2868 raw_spin_unlock(&kvm_count_lock
);
2871 static int hardware_enable_all(void)
2875 raw_spin_lock(&kvm_count_lock
);
2878 if (kvm_usage_count
== 1) {
2879 atomic_set(&hardware_enable_failed
, 0);
2880 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2882 if (atomic_read(&hardware_enable_failed
)) {
2883 hardware_disable_all_nolock();
2888 raw_spin_unlock(&kvm_count_lock
);
2893 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2898 val
&= ~CPU_TASKS_FROZEN
;
2901 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2906 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2914 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2918 * Some (well, at least mine) BIOSes hang on reboot if
2921 * And Intel TXT required VMX off for all cpu when system shutdown.
2923 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2924 kvm_rebooting
= true;
2925 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2929 static struct notifier_block kvm_reboot_notifier
= {
2930 .notifier_call
= kvm_reboot
,
2934 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2938 for (i
= 0; i
< bus
->dev_count
; i
++) {
2939 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2941 kvm_iodevice_destructor(pos
);
2946 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
2947 const struct kvm_io_range
*r2
)
2949 if (r1
->addr
< r2
->addr
)
2951 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2956 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2958 return kvm_io_bus_cmp(p1
, p2
);
2961 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2962 gpa_t addr
, int len
)
2964 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2970 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2971 kvm_io_bus_sort_cmp
, NULL
);
2976 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2977 gpa_t addr
, int len
)
2979 struct kvm_io_range
*range
, key
;
2982 key
= (struct kvm_io_range
) {
2987 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2988 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2992 off
= range
- bus
->range
;
2994 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
3000 static int __kvm_io_bus_write(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3001 struct kvm_io_range
*range
, const void *val
)
3005 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3009 while (idx
< bus
->dev_count
&&
3010 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3011 if (!kvm_iodevice_write(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3020 /* kvm_io_bus_write - called under kvm->slots_lock */
3021 int kvm_io_bus_write(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3022 int len
, const void *val
)
3024 struct kvm_io_bus
*bus
;
3025 struct kvm_io_range range
;
3028 range
= (struct kvm_io_range
) {
3033 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3034 r
= __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3035 return r
< 0 ? r
: 0;
3038 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3039 int kvm_io_bus_write_cookie(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
,
3040 gpa_t addr
, int len
, const void *val
, long cookie
)
3042 struct kvm_io_bus
*bus
;
3043 struct kvm_io_range range
;
3045 range
= (struct kvm_io_range
) {
3050 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3052 /* First try the device referenced by cookie. */
3053 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
3054 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
3055 if (!kvm_iodevice_write(vcpu
, bus
->range
[cookie
].dev
, addr
, len
,
3060 * cookie contained garbage; fall back to search and return the
3061 * correct cookie value.
3063 return __kvm_io_bus_write(vcpu
, bus
, &range
, val
);
3066 static int __kvm_io_bus_read(struct kvm_vcpu
*vcpu
, struct kvm_io_bus
*bus
,
3067 struct kvm_io_range
*range
, void *val
)
3071 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
3075 while (idx
< bus
->dev_count
&&
3076 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
3077 if (!kvm_iodevice_read(vcpu
, bus
->range
[idx
].dev
, range
->addr
,
3085 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
3087 /* kvm_io_bus_read - called under kvm->slots_lock */
3088 int kvm_io_bus_read(struct kvm_vcpu
*vcpu
, enum kvm_bus bus_idx
, gpa_t addr
,
3091 struct kvm_io_bus
*bus
;
3092 struct kvm_io_range range
;
3095 range
= (struct kvm_io_range
) {
3100 bus
= srcu_dereference(vcpu
->kvm
->buses
[bus_idx
], &vcpu
->kvm
->srcu
);
3101 r
= __kvm_io_bus_read(vcpu
, bus
, &range
, val
);
3102 return r
< 0 ? r
: 0;
3106 /* Caller must hold slots_lock. */
3107 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
3108 int len
, struct kvm_io_device
*dev
)
3110 struct kvm_io_bus
*new_bus
, *bus
;
3112 bus
= kvm
->buses
[bus_idx
];
3113 /* exclude ioeventfd which is limited by maximum fd */
3114 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
3117 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
3118 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3121 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
3122 sizeof(struct kvm_io_range
)));
3123 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
3124 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3125 synchronize_srcu_expedited(&kvm
->srcu
);
3131 /* Caller must hold slots_lock. */
3132 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
3133 struct kvm_io_device
*dev
)
3136 struct kvm_io_bus
*new_bus
, *bus
;
3138 bus
= kvm
->buses
[bus_idx
];
3140 for (i
= 0; i
< bus
->dev_count
; i
++)
3141 if (bus
->range
[i
].dev
== dev
) {
3149 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3150 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3154 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3155 new_bus
->dev_count
--;
3156 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3157 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3159 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3160 synchronize_srcu_expedited(&kvm
->srcu
);
3165 static struct notifier_block kvm_cpu_notifier
= {
3166 .notifier_call
= kvm_cpu_hotplug
,
3169 static int vm_stat_get(void *_offset
, u64
*val
)
3171 unsigned offset
= (long)_offset
;
3175 spin_lock(&kvm_lock
);
3176 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3177 *val
+= *(u32
*)((void *)kvm
+ offset
);
3178 spin_unlock(&kvm_lock
);
3182 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3184 static int vcpu_stat_get(void *_offset
, u64
*val
)
3186 unsigned offset
= (long)_offset
;
3188 struct kvm_vcpu
*vcpu
;
3192 spin_lock(&kvm_lock
);
3193 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3194 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3195 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3197 spin_unlock(&kvm_lock
);
3201 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3203 static const struct file_operations
*stat_fops
[] = {
3204 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3205 [KVM_STAT_VM
] = &vm_stat_fops
,
3208 static int kvm_init_debug(void)
3211 struct kvm_stats_debugfs_item
*p
;
3213 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3214 if (kvm_debugfs_dir
== NULL
)
3217 for (p
= debugfs_entries
; p
->name
; ++p
) {
3218 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3219 (void *)(long)p
->offset
,
3220 stat_fops
[p
->kind
]);
3221 if (p
->dentry
== NULL
)
3228 debugfs_remove_recursive(kvm_debugfs_dir
);
3233 static void kvm_exit_debug(void)
3235 struct kvm_stats_debugfs_item
*p
;
3237 for (p
= debugfs_entries
; p
->name
; ++p
)
3238 debugfs_remove(p
->dentry
);
3239 debugfs_remove(kvm_debugfs_dir
);
3242 static int kvm_suspend(void)
3244 if (kvm_usage_count
)
3245 hardware_disable_nolock(NULL
);
3249 static void kvm_resume(void)
3251 if (kvm_usage_count
) {
3252 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3253 hardware_enable_nolock(NULL
);
3257 static struct syscore_ops kvm_syscore_ops
= {
3258 .suspend
= kvm_suspend
,
3259 .resume
= kvm_resume
,
3263 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3265 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3268 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3270 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3271 if (vcpu
->preempted
)
3272 vcpu
->preempted
= false;
3274 kvm_arch_sched_in(vcpu
, cpu
);
3276 kvm_arch_vcpu_load(vcpu
, cpu
);
3279 static void kvm_sched_out(struct preempt_notifier
*pn
,
3280 struct task_struct
*next
)
3282 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3284 if (current
->state
== TASK_RUNNING
)
3285 vcpu
->preempted
= true;
3286 kvm_arch_vcpu_put(vcpu
);
3289 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3290 struct module
*module
)
3295 r
= kvm_arch_init(opaque
);
3300 * kvm_arch_init makes sure there's at most one caller
3301 * for architectures that support multiple implementations,
3302 * like intel and amd on x86.
3303 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3304 * conflicts in case kvm is already setup for another implementation.
3306 r
= kvm_irqfd_init();
3310 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3315 r
= kvm_arch_hardware_setup();
3319 for_each_online_cpu(cpu
) {
3320 smp_call_function_single(cpu
,
3321 kvm_arch_check_processor_compat
,
3327 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3330 register_reboot_notifier(&kvm_reboot_notifier
);
3332 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3334 vcpu_align
= __alignof__(struct kvm_vcpu
);
3335 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3337 if (!kvm_vcpu_cache
) {
3342 r
= kvm_async_pf_init();
3346 kvm_chardev_ops
.owner
= module
;
3347 kvm_vm_fops
.owner
= module
;
3348 kvm_vcpu_fops
.owner
= module
;
3350 r
= misc_register(&kvm_dev
);
3352 printk(KERN_ERR
"kvm: misc device register failed\n");
3356 register_syscore_ops(&kvm_syscore_ops
);
3358 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3359 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3361 r
= kvm_init_debug();
3363 printk(KERN_ERR
"kvm: create debugfs files failed\n");
3367 r
= kvm_vfio_ops_init();
3373 unregister_syscore_ops(&kvm_syscore_ops
);
3374 misc_deregister(&kvm_dev
);
3376 kvm_async_pf_deinit();
3378 kmem_cache_destroy(kvm_vcpu_cache
);
3380 unregister_reboot_notifier(&kvm_reboot_notifier
);
3381 unregister_cpu_notifier(&kvm_cpu_notifier
);
3384 kvm_arch_hardware_unsetup();
3386 free_cpumask_var(cpus_hardware_enabled
);
3394 EXPORT_SYMBOL_GPL(kvm_init
);
3399 misc_deregister(&kvm_dev
);
3400 kmem_cache_destroy(kvm_vcpu_cache
);
3401 kvm_async_pf_deinit();
3402 unregister_syscore_ops(&kvm_syscore_ops
);
3403 unregister_reboot_notifier(&kvm_reboot_notifier
);
3404 unregister_cpu_notifier(&kvm_cpu_notifier
);
3405 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3406 kvm_arch_hardware_unsetup();
3409 free_cpumask_var(cpus_hardware_enabled
);
3410 kvm_vfio_ops_exit();
3412 EXPORT_SYMBOL_GPL(kvm_exit
);