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/uaccess.h>
56 #include <asm/pgtable.h>
58 #include "coalesced_mmio.h"
61 #define CREATE_TRACE_POINTS
62 #include <trace/events/kvm.h>
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
70 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
73 DEFINE_SPINLOCK(kvm_lock
);
74 static DEFINE_RAW_SPINLOCK(kvm_count_lock
);
77 static cpumask_var_t cpus_hardware_enabled
;
78 static int kvm_usage_count
= 0;
79 static atomic_t hardware_enable_failed
;
81 struct kmem_cache
*kvm_vcpu_cache
;
82 EXPORT_SYMBOL_GPL(kvm_vcpu_cache
);
84 static __read_mostly
struct preempt_ops kvm_preempt_ops
;
86 struct dentry
*kvm_debugfs_dir
;
88 static long kvm_vcpu_ioctl(struct file
*file
, unsigned int ioctl
,
91 static long kvm_vcpu_compat_ioctl(struct file
*file
, unsigned int ioctl
,
94 static int hardware_enable_all(void);
95 static void hardware_disable_all(void);
97 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
);
98 static void update_memslots(struct kvm_memslots
*slots
,
99 struct kvm_memory_slot
*new, u64 last_generation
);
101 static void kvm_release_pfn_dirty(pfn_t pfn
);
102 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
103 struct kvm_memory_slot
*memslot
, gfn_t gfn
);
105 __visible
bool kvm_rebooting
;
106 EXPORT_SYMBOL_GPL(kvm_rebooting
);
108 static bool largepages_enabled
= true;
110 bool kvm_is_mmio_pfn(pfn_t pfn
)
113 return PageReserved(pfn_to_page(pfn
));
119 * Switches to specified vcpu, until a matching vcpu_put()
121 int vcpu_load(struct kvm_vcpu
*vcpu
)
125 if (mutex_lock_killable(&vcpu
->mutex
))
127 if (unlikely(vcpu
->pid
!= current
->pids
[PIDTYPE_PID
].pid
)) {
128 /* The thread running this VCPU changed. */
129 struct pid
*oldpid
= vcpu
->pid
;
130 struct pid
*newpid
= get_task_pid(current
, PIDTYPE_PID
);
131 rcu_assign_pointer(vcpu
->pid
, newpid
);
136 preempt_notifier_register(&vcpu
->preempt_notifier
);
137 kvm_arch_vcpu_load(vcpu
, cpu
);
142 void vcpu_put(struct kvm_vcpu
*vcpu
)
145 kvm_arch_vcpu_put(vcpu
);
146 preempt_notifier_unregister(&vcpu
->preempt_notifier
);
148 mutex_unlock(&vcpu
->mutex
);
151 static void ack_flush(void *_completed
)
155 static bool make_all_cpus_request(struct kvm
*kvm
, unsigned int req
)
160 struct kvm_vcpu
*vcpu
;
162 zalloc_cpumask_var(&cpus
, GFP_ATOMIC
);
165 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
166 kvm_make_request(req
, vcpu
);
169 /* Set ->requests bit before we read ->mode */
172 if (cpus
!= NULL
&& cpu
!= -1 && cpu
!= me
&&
173 kvm_vcpu_exiting_guest_mode(vcpu
) != OUTSIDE_GUEST_MODE
)
174 cpumask_set_cpu(cpu
, cpus
);
176 if (unlikely(cpus
== NULL
))
177 smp_call_function_many(cpu_online_mask
, ack_flush
, NULL
, 1);
178 else if (!cpumask_empty(cpus
))
179 smp_call_function_many(cpus
, ack_flush
, NULL
, 1);
183 free_cpumask_var(cpus
);
187 void kvm_flush_remote_tlbs(struct kvm
*kvm
)
189 long dirty_count
= kvm
->tlbs_dirty
;
192 if (make_all_cpus_request(kvm
, KVM_REQ_TLB_FLUSH
))
193 ++kvm
->stat
.remote_tlb_flush
;
194 cmpxchg(&kvm
->tlbs_dirty
, dirty_count
, 0);
196 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs
);
198 void kvm_reload_remote_mmus(struct kvm
*kvm
)
200 make_all_cpus_request(kvm
, KVM_REQ_MMU_RELOAD
);
203 void kvm_make_mclock_inprogress_request(struct kvm
*kvm
)
205 make_all_cpus_request(kvm
, KVM_REQ_MCLOCK_INPROGRESS
);
208 void kvm_make_scan_ioapic_request(struct kvm
*kvm
)
210 make_all_cpus_request(kvm
, KVM_REQ_SCAN_IOAPIC
);
213 int kvm_vcpu_init(struct kvm_vcpu
*vcpu
, struct kvm
*kvm
, unsigned id
)
218 mutex_init(&vcpu
->mutex
);
223 init_waitqueue_head(&vcpu
->wq
);
224 kvm_async_pf_vcpu_init(vcpu
);
226 page
= alloc_page(GFP_KERNEL
| __GFP_ZERO
);
231 vcpu
->run
= page_address(page
);
233 kvm_vcpu_set_in_spin_loop(vcpu
, false);
234 kvm_vcpu_set_dy_eligible(vcpu
, false);
235 vcpu
->preempted
= false;
237 r
= kvm_arch_vcpu_init(vcpu
);
243 free_page((unsigned long)vcpu
->run
);
247 EXPORT_SYMBOL_GPL(kvm_vcpu_init
);
249 void kvm_vcpu_uninit(struct kvm_vcpu
*vcpu
)
252 kvm_arch_vcpu_uninit(vcpu
);
253 free_page((unsigned long)vcpu
->run
);
255 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit
);
257 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
258 static inline struct kvm
*mmu_notifier_to_kvm(struct mmu_notifier
*mn
)
260 return container_of(mn
, struct kvm
, mmu_notifier
);
263 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier
*mn
,
264 struct mm_struct
*mm
,
265 unsigned long address
)
267 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
268 int need_tlb_flush
, idx
;
271 * When ->invalidate_page runs, the linux pte has been zapped
272 * already but the page is still allocated until
273 * ->invalidate_page returns. So if we increase the sequence
274 * here the kvm page fault will notice if the spte can't be
275 * established because the page is going to be freed. If
276 * instead the kvm page fault establishes the spte before
277 * ->invalidate_page runs, kvm_unmap_hva will release it
280 * The sequence increase only need to be seen at spin_unlock
281 * time, and not at spin_lock time.
283 * Increasing the sequence after the spin_unlock would be
284 * unsafe because the kvm page fault could then establish the
285 * pte after kvm_unmap_hva returned, without noticing the page
286 * is going to be freed.
288 idx
= srcu_read_lock(&kvm
->srcu
);
289 spin_lock(&kvm
->mmu_lock
);
291 kvm
->mmu_notifier_seq
++;
292 need_tlb_flush
= kvm_unmap_hva(kvm
, address
) | kvm
->tlbs_dirty
;
293 /* we've to flush the tlb before the pages can be freed */
295 kvm_flush_remote_tlbs(kvm
);
297 spin_unlock(&kvm
->mmu_lock
);
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
,
371 unsigned long address
)
373 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
376 idx
= srcu_read_lock(&kvm
->srcu
);
377 spin_lock(&kvm
->mmu_lock
);
379 young
= kvm_age_hva(kvm
, address
);
381 kvm_flush_remote_tlbs(kvm
);
383 spin_unlock(&kvm
->mmu_lock
);
384 srcu_read_unlock(&kvm
->srcu
, idx
);
389 static int kvm_mmu_notifier_test_young(struct mmu_notifier
*mn
,
390 struct mm_struct
*mm
,
391 unsigned long address
)
393 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
396 idx
= srcu_read_lock(&kvm
->srcu
);
397 spin_lock(&kvm
->mmu_lock
);
398 young
= kvm_test_age_hva(kvm
, address
);
399 spin_unlock(&kvm
->mmu_lock
);
400 srcu_read_unlock(&kvm
->srcu
, idx
);
405 static void kvm_mmu_notifier_release(struct mmu_notifier
*mn
,
406 struct mm_struct
*mm
)
408 struct kvm
*kvm
= mmu_notifier_to_kvm(mn
);
411 idx
= srcu_read_lock(&kvm
->srcu
);
412 kvm_arch_flush_shadow_all(kvm
);
413 srcu_read_unlock(&kvm
->srcu
, idx
);
416 static const struct mmu_notifier_ops kvm_mmu_notifier_ops
= {
417 .invalidate_page
= kvm_mmu_notifier_invalidate_page
,
418 .invalidate_range_start
= kvm_mmu_notifier_invalidate_range_start
,
419 .invalidate_range_end
= kvm_mmu_notifier_invalidate_range_end
,
420 .clear_flush_young
= kvm_mmu_notifier_clear_flush_young
,
421 .test_young
= kvm_mmu_notifier_test_young
,
422 .change_pte
= kvm_mmu_notifier_change_pte
,
423 .release
= kvm_mmu_notifier_release
,
426 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
428 kvm
->mmu_notifier
.ops
= &kvm_mmu_notifier_ops
;
429 return mmu_notifier_register(&kvm
->mmu_notifier
, current
->mm
);
432 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
434 static int kvm_init_mmu_notifier(struct kvm
*kvm
)
439 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
441 static void kvm_init_memslots_id(struct kvm
*kvm
)
444 struct kvm_memslots
*slots
= kvm
->memslots
;
446 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
447 slots
->id_to_index
[i
] = slots
->memslots
[i
].id
= i
;
450 static struct kvm
*kvm_create_vm(unsigned long type
)
453 struct kvm
*kvm
= kvm_arch_alloc_vm();
456 return ERR_PTR(-ENOMEM
);
458 r
= kvm_arch_init_vm(kvm
, type
);
460 goto out_err_no_disable
;
462 r
= hardware_enable_all();
464 goto out_err_no_disable
;
466 #ifdef CONFIG_HAVE_KVM_IRQCHIP
467 INIT_HLIST_HEAD(&kvm
->mask_notifier_list
);
469 #ifdef CONFIG_HAVE_KVM_IRQFD
470 INIT_HLIST_HEAD(&kvm
->irq_ack_notifier_list
);
473 BUILD_BUG_ON(KVM_MEM_SLOTS_NUM
> SHRT_MAX
);
476 kvm
->memslots
= kzalloc(sizeof(struct kvm_memslots
), GFP_KERNEL
);
478 goto out_err_no_srcu
;
479 kvm_init_memslots_id(kvm
);
480 if (init_srcu_struct(&kvm
->srcu
))
481 goto out_err_no_srcu
;
482 if (init_srcu_struct(&kvm
->irq_srcu
))
483 goto out_err_no_irq_srcu
;
484 for (i
= 0; i
< KVM_NR_BUSES
; i
++) {
485 kvm
->buses
[i
] = kzalloc(sizeof(struct kvm_io_bus
),
491 spin_lock_init(&kvm
->mmu_lock
);
492 kvm
->mm
= current
->mm
;
493 atomic_inc(&kvm
->mm
->mm_count
);
494 kvm_eventfd_init(kvm
);
495 mutex_init(&kvm
->lock
);
496 mutex_init(&kvm
->irq_lock
);
497 mutex_init(&kvm
->slots_lock
);
498 atomic_set(&kvm
->users_count
, 1);
499 INIT_LIST_HEAD(&kvm
->devices
);
501 r
= kvm_init_mmu_notifier(kvm
);
505 spin_lock(&kvm_lock
);
506 list_add(&kvm
->vm_list
, &vm_list
);
507 spin_unlock(&kvm_lock
);
512 cleanup_srcu_struct(&kvm
->irq_srcu
);
514 cleanup_srcu_struct(&kvm
->srcu
);
516 hardware_disable_all();
518 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
519 kfree(kvm
->buses
[i
]);
520 kfree(kvm
->memslots
);
521 kvm_arch_free_vm(kvm
);
526 * Avoid using vmalloc for a small buffer.
527 * Should not be used when the size is statically known.
529 void *kvm_kvzalloc(unsigned long size
)
531 if (size
> PAGE_SIZE
)
532 return vzalloc(size
);
534 return kzalloc(size
, GFP_KERNEL
);
537 void kvm_kvfree(const void *addr
)
539 if (is_vmalloc_addr(addr
))
545 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot
*memslot
)
547 if (!memslot
->dirty_bitmap
)
550 kvm_kvfree(memslot
->dirty_bitmap
);
551 memslot
->dirty_bitmap
= NULL
;
555 * Free any memory in @free but not in @dont.
557 static void kvm_free_physmem_slot(struct kvm
*kvm
, struct kvm_memory_slot
*free
,
558 struct kvm_memory_slot
*dont
)
560 if (!dont
|| free
->dirty_bitmap
!= dont
->dirty_bitmap
)
561 kvm_destroy_dirty_bitmap(free
);
563 kvm_arch_free_memslot(kvm
, free
, dont
);
568 static void kvm_free_physmem(struct kvm
*kvm
)
570 struct kvm_memslots
*slots
= kvm
->memslots
;
571 struct kvm_memory_slot
*memslot
;
573 kvm_for_each_memslot(memslot
, slots
)
574 kvm_free_physmem_slot(kvm
, memslot
, NULL
);
576 kfree(kvm
->memslots
);
579 static void kvm_destroy_devices(struct kvm
*kvm
)
581 struct list_head
*node
, *tmp
;
583 list_for_each_safe(node
, tmp
, &kvm
->devices
) {
584 struct kvm_device
*dev
=
585 list_entry(node
, struct kvm_device
, vm_node
);
588 dev
->ops
->destroy(dev
);
592 static void kvm_destroy_vm(struct kvm
*kvm
)
595 struct mm_struct
*mm
= kvm
->mm
;
597 kvm_arch_sync_events(kvm
);
598 spin_lock(&kvm_lock
);
599 list_del(&kvm
->vm_list
);
600 spin_unlock(&kvm_lock
);
601 kvm_free_irq_routing(kvm
);
602 for (i
= 0; i
< KVM_NR_BUSES
; i
++)
603 kvm_io_bus_destroy(kvm
->buses
[i
]);
604 kvm_coalesced_mmio_free(kvm
);
605 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
606 mmu_notifier_unregister(&kvm
->mmu_notifier
, kvm
->mm
);
608 kvm_arch_flush_shadow_all(kvm
);
610 kvm_arch_destroy_vm(kvm
);
611 kvm_destroy_devices(kvm
);
612 kvm_free_physmem(kvm
);
613 cleanup_srcu_struct(&kvm
->irq_srcu
);
614 cleanup_srcu_struct(&kvm
->srcu
);
615 kvm_arch_free_vm(kvm
);
616 hardware_disable_all();
620 void kvm_get_kvm(struct kvm
*kvm
)
622 atomic_inc(&kvm
->users_count
);
624 EXPORT_SYMBOL_GPL(kvm_get_kvm
);
626 void kvm_put_kvm(struct kvm
*kvm
)
628 if (atomic_dec_and_test(&kvm
->users_count
))
631 EXPORT_SYMBOL_GPL(kvm_put_kvm
);
634 static int kvm_vm_release(struct inode
*inode
, struct file
*filp
)
636 struct kvm
*kvm
= filp
->private_data
;
638 kvm_irqfd_release(kvm
);
645 * Allocation size is twice as large as the actual dirty bitmap size.
646 * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
648 static int kvm_create_dirty_bitmap(struct kvm_memory_slot
*memslot
)
650 unsigned long dirty_bytes
= 2 * kvm_dirty_bitmap_bytes(memslot
);
652 memslot
->dirty_bitmap
= kvm_kvzalloc(dirty_bytes
);
653 if (!memslot
->dirty_bitmap
)
659 static int cmp_memslot(const void *slot1
, const void *slot2
)
661 struct kvm_memory_slot
*s1
, *s2
;
663 s1
= (struct kvm_memory_slot
*)slot1
;
664 s2
= (struct kvm_memory_slot
*)slot2
;
666 if (s1
->npages
< s2
->npages
)
668 if (s1
->npages
> s2
->npages
)
675 * Sort the memslots base on its size, so the larger slots
676 * will get better fit.
678 static void sort_memslots(struct kvm_memslots
*slots
)
682 sort(slots
->memslots
, KVM_MEM_SLOTS_NUM
,
683 sizeof(struct kvm_memory_slot
), cmp_memslot
, NULL
);
685 for (i
= 0; i
< KVM_MEM_SLOTS_NUM
; i
++)
686 slots
->id_to_index
[slots
->memslots
[i
].id
] = i
;
689 static void update_memslots(struct kvm_memslots
*slots
,
690 struct kvm_memory_slot
*new,
695 struct kvm_memory_slot
*old
= id_to_memslot(slots
, id
);
696 unsigned long npages
= old
->npages
;
699 if (new->npages
!= npages
)
700 sort_memslots(slots
);
703 slots
->generation
= last_generation
+ 1;
706 static int check_memory_region_flags(struct kvm_userspace_memory_region
*mem
)
708 u32 valid_flags
= KVM_MEM_LOG_DIRTY_PAGES
;
710 #ifdef KVM_CAP_READONLY_MEM
711 valid_flags
|= KVM_MEM_READONLY
;
714 if (mem
->flags
& ~valid_flags
)
720 static struct kvm_memslots
*install_new_memslots(struct kvm
*kvm
,
721 struct kvm_memslots
*slots
, struct kvm_memory_slot
*new)
723 struct kvm_memslots
*old_memslots
= kvm
->memslots
;
725 update_memslots(slots
, new, kvm
->memslots
->generation
);
726 rcu_assign_pointer(kvm
->memslots
, slots
);
727 synchronize_srcu_expedited(&kvm
->srcu
);
729 kvm_arch_memslots_updated(kvm
);
735 * Allocate some memory and give it an address in the guest physical address
738 * Discontiguous memory is allowed, mostly for framebuffers.
740 * Must be called holding mmap_sem for write.
742 int __kvm_set_memory_region(struct kvm
*kvm
,
743 struct kvm_userspace_memory_region
*mem
)
747 unsigned long npages
;
748 struct kvm_memory_slot
*slot
;
749 struct kvm_memory_slot old
, new;
750 struct kvm_memslots
*slots
= NULL
, *old_memslots
;
751 enum kvm_mr_change change
;
753 r
= check_memory_region_flags(mem
);
758 /* General sanity checks */
759 if (mem
->memory_size
& (PAGE_SIZE
- 1))
761 if (mem
->guest_phys_addr
& (PAGE_SIZE
- 1))
763 /* We can read the guest memory with __xxx_user() later on. */
764 if ((mem
->slot
< KVM_USER_MEM_SLOTS
) &&
765 ((mem
->userspace_addr
& (PAGE_SIZE
- 1)) ||
766 !access_ok(VERIFY_WRITE
,
767 (void __user
*)(unsigned long)mem
->userspace_addr
,
770 if (mem
->slot
>= KVM_MEM_SLOTS_NUM
)
772 if (mem
->guest_phys_addr
+ mem
->memory_size
< mem
->guest_phys_addr
)
775 slot
= id_to_memslot(kvm
->memslots
, mem
->slot
);
776 base_gfn
= mem
->guest_phys_addr
>> PAGE_SHIFT
;
777 npages
= mem
->memory_size
>> PAGE_SHIFT
;
780 if (npages
> KVM_MEM_MAX_NR_PAGES
)
784 mem
->flags
&= ~KVM_MEM_LOG_DIRTY_PAGES
;
789 new.base_gfn
= base_gfn
;
791 new.flags
= mem
->flags
;
796 change
= KVM_MR_CREATE
;
797 else { /* Modify an existing slot. */
798 if ((mem
->userspace_addr
!= old
.userspace_addr
) ||
799 (npages
!= old
.npages
) ||
800 ((new.flags
^ old
.flags
) & KVM_MEM_READONLY
))
803 if (base_gfn
!= old
.base_gfn
)
804 change
= KVM_MR_MOVE
;
805 else if (new.flags
!= old
.flags
)
806 change
= KVM_MR_FLAGS_ONLY
;
807 else { /* Nothing to change. */
812 } else if (old
.npages
) {
813 change
= KVM_MR_DELETE
;
814 } else /* Modify a non-existent slot: disallowed. */
817 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
818 /* Check for overlaps */
820 kvm_for_each_memslot(slot
, kvm
->memslots
) {
821 if ((slot
->id
>= KVM_USER_MEM_SLOTS
) ||
822 (slot
->id
== mem
->slot
))
824 if (!((base_gfn
+ npages
<= slot
->base_gfn
) ||
825 (base_gfn
>= slot
->base_gfn
+ slot
->npages
)))
830 /* Free page dirty bitmap if unneeded */
831 if (!(new.flags
& KVM_MEM_LOG_DIRTY_PAGES
))
832 new.dirty_bitmap
= NULL
;
835 if (change
== KVM_MR_CREATE
) {
836 new.userspace_addr
= mem
->userspace_addr
;
838 if (kvm_arch_create_memslot(kvm
, &new, npages
))
842 /* Allocate page dirty bitmap if needed */
843 if ((new.flags
& KVM_MEM_LOG_DIRTY_PAGES
) && !new.dirty_bitmap
) {
844 if (kvm_create_dirty_bitmap(&new) < 0)
848 if ((change
== KVM_MR_DELETE
) || (change
== KVM_MR_MOVE
)) {
850 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
854 slot
= id_to_memslot(slots
, mem
->slot
);
855 slot
->flags
|= KVM_MEMSLOT_INVALID
;
857 old_memslots
= install_new_memslots(kvm
, slots
, NULL
);
859 /* slot was deleted or moved, clear iommu mapping */
860 kvm_iommu_unmap_pages(kvm
, &old
);
861 /* From this point no new shadow pages pointing to a deleted,
862 * or moved, memslot will be created.
864 * validation of sp->gfn happens in:
865 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
866 * - kvm_is_visible_gfn (mmu_check_roots)
868 kvm_arch_flush_shadow_memslot(kvm
, slot
);
869 slots
= old_memslots
;
872 r
= kvm_arch_prepare_memory_region(kvm
, &new, mem
, change
);
878 * We can re-use the old_memslots from above, the only difference
879 * from the currently installed memslots is the invalid flag. This
880 * will get overwritten by update_memslots anyway.
883 slots
= kmemdup(kvm
->memslots
, sizeof(struct kvm_memslots
),
889 /* actual memory is freed via old in kvm_free_physmem_slot below */
890 if (change
== KVM_MR_DELETE
) {
891 new.dirty_bitmap
= NULL
;
892 memset(&new.arch
, 0, sizeof(new.arch
));
895 old_memslots
= install_new_memslots(kvm
, slots
, &new);
897 kvm_arch_commit_memory_region(kvm
, mem
, &old
, change
);
899 kvm_free_physmem_slot(kvm
, &old
, &new);
903 * IOMMU mapping: New slots need to be mapped. Old slots need to be
904 * un-mapped and re-mapped if their base changes. Since base change
905 * unmapping is handled above with slot deletion, mapping alone is
906 * needed here. Anything else the iommu might care about for existing
907 * slots (size changes, userspace addr changes and read-only flag
908 * changes) is disallowed above, so any other attribute changes getting
909 * here can be skipped.
911 if ((change
== KVM_MR_CREATE
) || (change
== KVM_MR_MOVE
)) {
912 r
= kvm_iommu_map_pages(kvm
, &new);
921 kvm_free_physmem_slot(kvm
, &new, &old
);
925 EXPORT_SYMBOL_GPL(__kvm_set_memory_region
);
927 int kvm_set_memory_region(struct kvm
*kvm
,
928 struct kvm_userspace_memory_region
*mem
)
932 mutex_lock(&kvm
->slots_lock
);
933 r
= __kvm_set_memory_region(kvm
, mem
);
934 mutex_unlock(&kvm
->slots_lock
);
937 EXPORT_SYMBOL_GPL(kvm_set_memory_region
);
939 static int kvm_vm_ioctl_set_memory_region(struct kvm
*kvm
,
940 struct kvm_userspace_memory_region
*mem
)
942 if (mem
->slot
>= KVM_USER_MEM_SLOTS
)
944 return kvm_set_memory_region(kvm
, mem
);
947 int kvm_get_dirty_log(struct kvm
*kvm
,
948 struct kvm_dirty_log
*log
, int *is_dirty
)
950 struct kvm_memory_slot
*memslot
;
953 unsigned long any
= 0;
956 if (log
->slot
>= KVM_USER_MEM_SLOTS
)
959 memslot
= id_to_memslot(kvm
->memslots
, log
->slot
);
961 if (!memslot
->dirty_bitmap
)
964 n
= kvm_dirty_bitmap_bytes(memslot
);
966 for (i
= 0; !any
&& i
< n
/sizeof(long); ++i
)
967 any
= memslot
->dirty_bitmap
[i
];
970 if (copy_to_user(log
->dirty_bitmap
, memslot
->dirty_bitmap
, n
))
980 EXPORT_SYMBOL_GPL(kvm_get_dirty_log
);
982 bool kvm_largepages_enabled(void)
984 return largepages_enabled
;
987 void kvm_disable_largepages(void)
989 largepages_enabled
= false;
991 EXPORT_SYMBOL_GPL(kvm_disable_largepages
);
993 struct kvm_memory_slot
*gfn_to_memslot(struct kvm
*kvm
, gfn_t gfn
)
995 return __gfn_to_memslot(kvm_memslots(kvm
), gfn
);
997 EXPORT_SYMBOL_GPL(gfn_to_memslot
);
999 int kvm_is_visible_gfn(struct kvm
*kvm
, gfn_t gfn
)
1001 struct kvm_memory_slot
*memslot
= gfn_to_memslot(kvm
, gfn
);
1003 if (!memslot
|| memslot
->id
>= KVM_USER_MEM_SLOTS
||
1004 memslot
->flags
& KVM_MEMSLOT_INVALID
)
1009 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn
);
1011 unsigned long kvm_host_page_size(struct kvm
*kvm
, gfn_t gfn
)
1013 struct vm_area_struct
*vma
;
1014 unsigned long addr
, size
;
1018 addr
= gfn_to_hva(kvm
, gfn
);
1019 if (kvm_is_error_hva(addr
))
1022 down_read(¤t
->mm
->mmap_sem
);
1023 vma
= find_vma(current
->mm
, addr
);
1027 size
= vma_kernel_pagesize(vma
);
1030 up_read(¤t
->mm
->mmap_sem
);
1035 static bool memslot_is_readonly(struct kvm_memory_slot
*slot
)
1037 return slot
->flags
& KVM_MEM_READONLY
;
1040 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1041 gfn_t
*nr_pages
, bool write
)
1043 if (!slot
|| slot
->flags
& KVM_MEMSLOT_INVALID
)
1044 return KVM_HVA_ERR_BAD
;
1046 if (memslot_is_readonly(slot
) && write
)
1047 return KVM_HVA_ERR_RO_BAD
;
1050 *nr_pages
= slot
->npages
- (gfn
- slot
->base_gfn
);
1052 return __gfn_to_hva_memslot(slot
, gfn
);
1055 static unsigned long gfn_to_hva_many(struct kvm_memory_slot
*slot
, gfn_t gfn
,
1058 return __gfn_to_hva_many(slot
, gfn
, nr_pages
, true);
1061 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot
*slot
,
1064 return gfn_to_hva_many(slot
, gfn
, NULL
);
1066 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot
);
1068 unsigned long gfn_to_hva(struct kvm
*kvm
, gfn_t gfn
)
1070 return gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, NULL
);
1072 EXPORT_SYMBOL_GPL(gfn_to_hva
);
1075 * If writable is set to false, the hva returned by this function is only
1076 * allowed to be read.
1078 unsigned long gfn_to_hva_prot(struct kvm
*kvm
, gfn_t gfn
, bool *writable
)
1080 struct kvm_memory_slot
*slot
= gfn_to_memslot(kvm
, gfn
);
1081 unsigned long hva
= __gfn_to_hva_many(slot
, gfn
, NULL
, false);
1083 if (!kvm_is_error_hva(hva
) && writable
)
1084 *writable
= !memslot_is_readonly(slot
);
1089 static int kvm_read_hva(void *data
, void __user
*hva
, int len
)
1091 return __copy_from_user(data
, hva
, len
);
1094 static int kvm_read_hva_atomic(void *data
, void __user
*hva
, int len
)
1096 return __copy_from_user_inatomic(data
, hva
, len
);
1099 static int get_user_page_nowait(struct task_struct
*tsk
, struct mm_struct
*mm
,
1100 unsigned long start
, int write
, struct page
**page
)
1102 int flags
= FOLL_TOUCH
| FOLL_NOWAIT
| FOLL_HWPOISON
| FOLL_GET
;
1105 flags
|= FOLL_WRITE
;
1107 return __get_user_pages(tsk
, mm
, start
, 1, flags
, page
, NULL
, NULL
);
1110 static inline int check_user_page_hwpoison(unsigned long addr
)
1112 int rc
, flags
= FOLL_TOUCH
| FOLL_HWPOISON
| FOLL_WRITE
;
1114 rc
= __get_user_pages(current
, current
->mm
, addr
, 1,
1115 flags
, NULL
, NULL
, NULL
);
1116 return rc
== -EHWPOISON
;
1120 * The atomic path to get the writable pfn which will be stored in @pfn,
1121 * true indicates success, otherwise false is returned.
1123 static bool hva_to_pfn_fast(unsigned long addr
, bool atomic
, bool *async
,
1124 bool write_fault
, bool *writable
, pfn_t
*pfn
)
1126 struct page
*page
[1];
1129 if (!(async
|| atomic
))
1133 * Fast pin a writable pfn only if it is a write fault request
1134 * or the caller allows to map a writable pfn for a read fault
1137 if (!(write_fault
|| writable
))
1140 npages
= __get_user_pages_fast(addr
, 1, 1, page
);
1142 *pfn
= page_to_pfn(page
[0]);
1153 * The slow path to get the pfn of the specified host virtual address,
1154 * 1 indicates success, -errno is returned if error is detected.
1156 static int hva_to_pfn_slow(unsigned long addr
, bool *async
, bool write_fault
,
1157 bool *writable
, pfn_t
*pfn
)
1159 struct page
*page
[1];
1165 *writable
= write_fault
;
1168 down_read(¤t
->mm
->mmap_sem
);
1169 npages
= get_user_page_nowait(current
, current
->mm
,
1170 addr
, write_fault
, page
);
1171 up_read(¤t
->mm
->mmap_sem
);
1173 npages
= get_user_pages_fast(addr
, 1, write_fault
,
1178 /* map read fault as writable if possible */
1179 if (unlikely(!write_fault
) && writable
) {
1180 struct page
*wpage
[1];
1182 npages
= __get_user_pages_fast(addr
, 1, 1, wpage
);
1191 *pfn
= page_to_pfn(page
[0]);
1195 static bool vma_is_valid(struct vm_area_struct
*vma
, bool write_fault
)
1197 if (unlikely(!(vma
->vm_flags
& VM_READ
)))
1200 if (write_fault
&& (unlikely(!(vma
->vm_flags
& VM_WRITE
))))
1207 * Pin guest page in memory and return its pfn.
1208 * @addr: host virtual address which maps memory to the guest
1209 * @atomic: whether this function can sleep
1210 * @async: whether this function need to wait IO complete if the
1211 * host page is not in the memory
1212 * @write_fault: whether we should get a writable host page
1213 * @writable: whether it allows to map a writable host page for !@write_fault
1215 * The function will map a writable host page for these two cases:
1216 * 1): @write_fault = true
1217 * 2): @write_fault = false && @writable, @writable will tell the caller
1218 * whether the mapping is writable.
1220 static pfn_t
hva_to_pfn(unsigned long addr
, bool atomic
, bool *async
,
1221 bool write_fault
, bool *writable
)
1223 struct vm_area_struct
*vma
;
1227 /* we can do it either atomically or asynchronously, not both */
1228 BUG_ON(atomic
&& async
);
1230 if (hva_to_pfn_fast(addr
, atomic
, async
, write_fault
, writable
, &pfn
))
1234 return KVM_PFN_ERR_FAULT
;
1236 npages
= hva_to_pfn_slow(addr
, async
, write_fault
, writable
, &pfn
);
1240 down_read(¤t
->mm
->mmap_sem
);
1241 if (npages
== -EHWPOISON
||
1242 (!async
&& check_user_page_hwpoison(addr
))) {
1243 pfn
= KVM_PFN_ERR_HWPOISON
;
1247 vma
= find_vma_intersection(current
->mm
, addr
, addr
+ 1);
1250 pfn
= KVM_PFN_ERR_FAULT
;
1251 else if ((vma
->vm_flags
& VM_PFNMAP
)) {
1252 pfn
= ((addr
- vma
->vm_start
) >> PAGE_SHIFT
) +
1254 BUG_ON(!kvm_is_mmio_pfn(pfn
));
1256 if (async
&& vma_is_valid(vma
, write_fault
))
1258 pfn
= KVM_PFN_ERR_FAULT
;
1261 up_read(¤t
->mm
->mmap_sem
);
1266 __gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
, bool atomic
,
1267 bool *async
, bool write_fault
, bool *writable
)
1269 unsigned long addr
= __gfn_to_hva_many(slot
, gfn
, NULL
, write_fault
);
1271 if (addr
== KVM_HVA_ERR_RO_BAD
)
1272 return KVM_PFN_ERR_RO_FAULT
;
1274 if (kvm_is_error_hva(addr
))
1275 return KVM_PFN_NOSLOT
;
1277 /* Do not map writable pfn in the readonly memslot. */
1278 if (writable
&& memslot_is_readonly(slot
)) {
1283 return hva_to_pfn(addr
, atomic
, async
, write_fault
,
1287 static pfn_t
__gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
, bool atomic
, bool *async
,
1288 bool write_fault
, bool *writable
)
1290 struct kvm_memory_slot
*slot
;
1295 slot
= gfn_to_memslot(kvm
, gfn
);
1297 return __gfn_to_pfn_memslot(slot
, gfn
, atomic
, async
, write_fault
,
1301 pfn_t
gfn_to_pfn_atomic(struct kvm
*kvm
, gfn_t gfn
)
1303 return __gfn_to_pfn(kvm
, gfn
, true, NULL
, true, NULL
);
1305 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic
);
1307 pfn_t
gfn_to_pfn_async(struct kvm
*kvm
, gfn_t gfn
, bool *async
,
1308 bool write_fault
, bool *writable
)
1310 return __gfn_to_pfn(kvm
, gfn
, false, async
, write_fault
, writable
);
1312 EXPORT_SYMBOL_GPL(gfn_to_pfn_async
);
1314 pfn_t
gfn_to_pfn(struct kvm
*kvm
, gfn_t gfn
)
1316 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, true, NULL
);
1318 EXPORT_SYMBOL_GPL(gfn_to_pfn
);
1320 pfn_t
gfn_to_pfn_prot(struct kvm
*kvm
, gfn_t gfn
, bool write_fault
,
1323 return __gfn_to_pfn(kvm
, gfn
, false, NULL
, write_fault
, writable
);
1325 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot
);
1327 pfn_t
gfn_to_pfn_memslot(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1329 return __gfn_to_pfn_memslot(slot
, gfn
, false, NULL
, true, NULL
);
1332 pfn_t
gfn_to_pfn_memslot_atomic(struct kvm_memory_slot
*slot
, gfn_t gfn
)
1334 return __gfn_to_pfn_memslot(slot
, gfn
, true, NULL
, true, NULL
);
1336 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic
);
1338 int gfn_to_page_many_atomic(struct kvm
*kvm
, gfn_t gfn
, struct page
**pages
,
1344 addr
= gfn_to_hva_many(gfn_to_memslot(kvm
, gfn
), gfn
, &entry
);
1345 if (kvm_is_error_hva(addr
))
1348 if (entry
< nr_pages
)
1351 return __get_user_pages_fast(addr
, nr_pages
, 1, pages
);
1353 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic
);
1355 static struct page
*kvm_pfn_to_page(pfn_t pfn
)
1357 if (is_error_noslot_pfn(pfn
))
1358 return KVM_ERR_PTR_BAD_PAGE
;
1360 if (kvm_is_mmio_pfn(pfn
)) {
1362 return KVM_ERR_PTR_BAD_PAGE
;
1365 return pfn_to_page(pfn
);
1368 struct page
*gfn_to_page(struct kvm
*kvm
, gfn_t gfn
)
1372 pfn
= gfn_to_pfn(kvm
, gfn
);
1374 return kvm_pfn_to_page(pfn
);
1377 EXPORT_SYMBOL_GPL(gfn_to_page
);
1379 void kvm_release_page_clean(struct page
*page
)
1381 WARN_ON(is_error_page(page
));
1383 kvm_release_pfn_clean(page_to_pfn(page
));
1385 EXPORT_SYMBOL_GPL(kvm_release_page_clean
);
1387 void kvm_release_pfn_clean(pfn_t pfn
)
1389 if (!is_error_noslot_pfn(pfn
) && !kvm_is_mmio_pfn(pfn
))
1390 put_page(pfn_to_page(pfn
));
1392 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean
);
1394 void kvm_release_page_dirty(struct page
*page
)
1396 WARN_ON(is_error_page(page
));
1398 kvm_release_pfn_dirty(page_to_pfn(page
));
1400 EXPORT_SYMBOL_GPL(kvm_release_page_dirty
);
1402 static void kvm_release_pfn_dirty(pfn_t pfn
)
1404 kvm_set_pfn_dirty(pfn
);
1405 kvm_release_pfn_clean(pfn
);
1408 void kvm_set_pfn_dirty(pfn_t pfn
)
1410 if (!kvm_is_mmio_pfn(pfn
)) {
1411 struct page
*page
= pfn_to_page(pfn
);
1412 if (!PageReserved(page
))
1416 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty
);
1418 void kvm_set_pfn_accessed(pfn_t pfn
)
1420 if (!kvm_is_mmio_pfn(pfn
))
1421 mark_page_accessed(pfn_to_page(pfn
));
1423 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed
);
1425 void kvm_get_pfn(pfn_t pfn
)
1427 if (!kvm_is_mmio_pfn(pfn
))
1428 get_page(pfn_to_page(pfn
));
1430 EXPORT_SYMBOL_GPL(kvm_get_pfn
);
1432 static int next_segment(unsigned long len
, int offset
)
1434 if (len
> PAGE_SIZE
- offset
)
1435 return PAGE_SIZE
- offset
;
1440 int kvm_read_guest_page(struct kvm
*kvm
, gfn_t gfn
, void *data
, int offset
,
1446 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1447 if (kvm_is_error_hva(addr
))
1449 r
= kvm_read_hva(data
, (void __user
*)addr
+ offset
, len
);
1454 EXPORT_SYMBOL_GPL(kvm_read_guest_page
);
1456 int kvm_read_guest(struct kvm
*kvm
, gpa_t gpa
, void *data
, unsigned long len
)
1458 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1460 int offset
= offset_in_page(gpa
);
1463 while ((seg
= next_segment(len
, offset
)) != 0) {
1464 ret
= kvm_read_guest_page(kvm
, gfn
, data
, offset
, seg
);
1474 EXPORT_SYMBOL_GPL(kvm_read_guest
);
1476 int kvm_read_guest_atomic(struct kvm
*kvm
, gpa_t gpa
, void *data
,
1481 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1482 int offset
= offset_in_page(gpa
);
1484 addr
= gfn_to_hva_prot(kvm
, gfn
, NULL
);
1485 if (kvm_is_error_hva(addr
))
1487 pagefault_disable();
1488 r
= kvm_read_hva_atomic(data
, (void __user
*)addr
+ offset
, len
);
1494 EXPORT_SYMBOL(kvm_read_guest_atomic
);
1496 int kvm_write_guest_page(struct kvm
*kvm
, gfn_t gfn
, const void *data
,
1497 int offset
, int len
)
1502 addr
= gfn_to_hva(kvm
, gfn
);
1503 if (kvm_is_error_hva(addr
))
1505 r
= __copy_to_user((void __user
*)addr
+ offset
, data
, len
);
1508 mark_page_dirty(kvm
, gfn
);
1511 EXPORT_SYMBOL_GPL(kvm_write_guest_page
);
1513 int kvm_write_guest(struct kvm
*kvm
, gpa_t gpa
, const void *data
,
1516 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1518 int offset
= offset_in_page(gpa
);
1521 while ((seg
= next_segment(len
, offset
)) != 0) {
1522 ret
= kvm_write_guest_page(kvm
, gfn
, data
, offset
, seg
);
1533 int kvm_gfn_to_hva_cache_init(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1534 gpa_t gpa
, unsigned long len
)
1536 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1537 int offset
= offset_in_page(gpa
);
1538 gfn_t start_gfn
= gpa
>> PAGE_SHIFT
;
1539 gfn_t end_gfn
= (gpa
+ len
- 1) >> PAGE_SHIFT
;
1540 gfn_t nr_pages_needed
= end_gfn
- start_gfn
+ 1;
1541 gfn_t nr_pages_avail
;
1544 ghc
->generation
= slots
->generation
;
1546 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1547 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
, &nr_pages_avail
);
1548 if (!kvm_is_error_hva(ghc
->hva
) && nr_pages_avail
>= nr_pages_needed
) {
1552 * If the requested region crosses two memslots, we still
1553 * verify that the entire region is valid here.
1555 while (start_gfn
<= end_gfn
) {
1556 ghc
->memslot
= gfn_to_memslot(kvm
, start_gfn
);
1557 ghc
->hva
= gfn_to_hva_many(ghc
->memslot
, start_gfn
,
1559 if (kvm_is_error_hva(ghc
->hva
))
1561 start_gfn
+= nr_pages_avail
;
1563 /* Use the slow path for cross page reads and writes. */
1564 ghc
->memslot
= NULL
;
1568 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init
);
1570 int kvm_write_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1571 void *data
, unsigned long len
)
1573 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1576 BUG_ON(len
> ghc
->len
);
1578 if (slots
->generation
!= ghc
->generation
)
1579 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1581 if (unlikely(!ghc
->memslot
))
1582 return kvm_write_guest(kvm
, ghc
->gpa
, data
, len
);
1584 if (kvm_is_error_hva(ghc
->hva
))
1587 r
= __copy_to_user((void __user
*)ghc
->hva
, data
, len
);
1590 mark_page_dirty_in_slot(kvm
, ghc
->memslot
, ghc
->gpa
>> PAGE_SHIFT
);
1594 EXPORT_SYMBOL_GPL(kvm_write_guest_cached
);
1596 int kvm_read_guest_cached(struct kvm
*kvm
, struct gfn_to_hva_cache
*ghc
,
1597 void *data
, unsigned long len
)
1599 struct kvm_memslots
*slots
= kvm_memslots(kvm
);
1602 BUG_ON(len
> ghc
->len
);
1604 if (slots
->generation
!= ghc
->generation
)
1605 kvm_gfn_to_hva_cache_init(kvm
, ghc
, ghc
->gpa
, ghc
->len
);
1607 if (unlikely(!ghc
->memslot
))
1608 return kvm_read_guest(kvm
, ghc
->gpa
, data
, len
);
1610 if (kvm_is_error_hva(ghc
->hva
))
1613 r
= __copy_from_user(data
, (void __user
*)ghc
->hva
, len
);
1619 EXPORT_SYMBOL_GPL(kvm_read_guest_cached
);
1621 int kvm_clear_guest_page(struct kvm
*kvm
, gfn_t gfn
, int offset
, int len
)
1623 const void *zero_page
= (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1625 return kvm_write_guest_page(kvm
, gfn
, zero_page
, offset
, len
);
1627 EXPORT_SYMBOL_GPL(kvm_clear_guest_page
);
1629 int kvm_clear_guest(struct kvm
*kvm
, gpa_t gpa
, unsigned long len
)
1631 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1633 int offset
= offset_in_page(gpa
);
1636 while ((seg
= next_segment(len
, offset
)) != 0) {
1637 ret
= kvm_clear_guest_page(kvm
, gfn
, offset
, seg
);
1646 EXPORT_SYMBOL_GPL(kvm_clear_guest
);
1648 static void mark_page_dirty_in_slot(struct kvm
*kvm
,
1649 struct kvm_memory_slot
*memslot
,
1652 if (memslot
&& memslot
->dirty_bitmap
) {
1653 unsigned long rel_gfn
= gfn
- memslot
->base_gfn
;
1655 set_bit_le(rel_gfn
, memslot
->dirty_bitmap
);
1659 void mark_page_dirty(struct kvm
*kvm
, gfn_t gfn
)
1661 struct kvm_memory_slot
*memslot
;
1663 memslot
= gfn_to_memslot(kvm
, gfn
);
1664 mark_page_dirty_in_slot(kvm
, memslot
, gfn
);
1666 EXPORT_SYMBOL_GPL(mark_page_dirty
);
1669 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1671 void kvm_vcpu_block(struct kvm_vcpu
*vcpu
)
1676 prepare_to_wait(&vcpu
->wq
, &wait
, TASK_INTERRUPTIBLE
);
1678 if (kvm_arch_vcpu_runnable(vcpu
)) {
1679 kvm_make_request(KVM_REQ_UNHALT
, vcpu
);
1682 if (kvm_cpu_has_pending_timer(vcpu
))
1684 if (signal_pending(current
))
1690 finish_wait(&vcpu
->wq
, &wait
);
1692 EXPORT_SYMBOL_GPL(kvm_vcpu_block
);
1696 * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
1698 void kvm_vcpu_kick(struct kvm_vcpu
*vcpu
)
1701 int cpu
= vcpu
->cpu
;
1702 wait_queue_head_t
*wqp
;
1704 wqp
= kvm_arch_vcpu_wq(vcpu
);
1705 if (waitqueue_active(wqp
)) {
1706 wake_up_interruptible(wqp
);
1707 ++vcpu
->stat
.halt_wakeup
;
1711 if (cpu
!= me
&& (unsigned)cpu
< nr_cpu_ids
&& cpu_online(cpu
))
1712 if (kvm_arch_vcpu_should_kick(vcpu
))
1713 smp_send_reschedule(cpu
);
1716 EXPORT_SYMBOL_GPL(kvm_vcpu_kick
);
1717 #endif /* !CONFIG_S390 */
1719 int kvm_vcpu_yield_to(struct kvm_vcpu
*target
)
1722 struct task_struct
*task
= NULL
;
1726 pid
= rcu_dereference(target
->pid
);
1728 task
= get_pid_task(target
->pid
, PIDTYPE_PID
);
1732 if (task
->flags
& PF_VCPU
) {
1733 put_task_struct(task
);
1736 ret
= yield_to(task
, 1);
1737 put_task_struct(task
);
1741 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to
);
1744 * Helper that checks whether a VCPU is eligible for directed yield.
1745 * Most eligible candidate to yield is decided by following heuristics:
1747 * (a) VCPU which has not done pl-exit or cpu relax intercepted recently
1748 * (preempted lock holder), indicated by @in_spin_loop.
1749 * Set at the beiginning and cleared at the end of interception/PLE handler.
1751 * (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
1752 * chance last time (mostly it has become eligible now since we have probably
1753 * yielded to lockholder in last iteration. This is done by toggling
1754 * @dy_eligible each time a VCPU checked for eligibility.)
1756 * Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
1757 * to preempted lock-holder could result in wrong VCPU selection and CPU
1758 * burning. Giving priority for a potential lock-holder increases lock
1761 * Since algorithm is based on heuristics, accessing another VCPU data without
1762 * locking does not harm. It may result in trying to yield to same VCPU, fail
1763 * and continue with next VCPU and so on.
1765 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu
*vcpu
)
1767 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
1770 eligible
= !vcpu
->spin_loop
.in_spin_loop
||
1771 (vcpu
->spin_loop
.in_spin_loop
&&
1772 vcpu
->spin_loop
.dy_eligible
);
1774 if (vcpu
->spin_loop
.in_spin_loop
)
1775 kvm_vcpu_set_dy_eligible(vcpu
, !vcpu
->spin_loop
.dy_eligible
);
1783 void kvm_vcpu_on_spin(struct kvm_vcpu
*me
)
1785 struct kvm
*kvm
= me
->kvm
;
1786 struct kvm_vcpu
*vcpu
;
1787 int last_boosted_vcpu
= me
->kvm
->last_boosted_vcpu
;
1793 kvm_vcpu_set_in_spin_loop(me
, true);
1795 * We boost the priority of a VCPU that is runnable but not
1796 * currently running, because it got preempted by something
1797 * else and called schedule in __vcpu_run. Hopefully that
1798 * VCPU is holding the lock that we need and will release it.
1799 * We approximate round-robin by starting at the last boosted VCPU.
1801 for (pass
= 0; pass
< 2 && !yielded
&& try; pass
++) {
1802 kvm_for_each_vcpu(i
, vcpu
, kvm
) {
1803 if (!pass
&& i
<= last_boosted_vcpu
) {
1804 i
= last_boosted_vcpu
;
1806 } else if (pass
&& i
> last_boosted_vcpu
)
1808 if (!ACCESS_ONCE(vcpu
->preempted
))
1812 if (waitqueue_active(&vcpu
->wq
) && !kvm_arch_vcpu_runnable(vcpu
))
1814 if (!kvm_vcpu_eligible_for_directed_yield(vcpu
))
1817 yielded
= kvm_vcpu_yield_to(vcpu
);
1819 kvm
->last_boosted_vcpu
= i
;
1821 } else if (yielded
< 0) {
1828 kvm_vcpu_set_in_spin_loop(me
, false);
1830 /* Ensure vcpu is not eligible during next spinloop */
1831 kvm_vcpu_set_dy_eligible(me
, false);
1833 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin
);
1835 static int kvm_vcpu_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
)
1837 struct kvm_vcpu
*vcpu
= vma
->vm_file
->private_data
;
1840 if (vmf
->pgoff
== 0)
1841 page
= virt_to_page(vcpu
->run
);
1843 else if (vmf
->pgoff
== KVM_PIO_PAGE_OFFSET
)
1844 page
= virt_to_page(vcpu
->arch
.pio_data
);
1846 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1847 else if (vmf
->pgoff
== KVM_COALESCED_MMIO_PAGE_OFFSET
)
1848 page
= virt_to_page(vcpu
->kvm
->coalesced_mmio_ring
);
1851 return kvm_arch_vcpu_fault(vcpu
, vmf
);
1857 static const struct vm_operations_struct kvm_vcpu_vm_ops
= {
1858 .fault
= kvm_vcpu_fault
,
1861 static int kvm_vcpu_mmap(struct file
*file
, struct vm_area_struct
*vma
)
1863 vma
->vm_ops
= &kvm_vcpu_vm_ops
;
1867 static int kvm_vcpu_release(struct inode
*inode
, struct file
*filp
)
1869 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1871 kvm_put_kvm(vcpu
->kvm
);
1875 static struct file_operations kvm_vcpu_fops
= {
1876 .release
= kvm_vcpu_release
,
1877 .unlocked_ioctl
= kvm_vcpu_ioctl
,
1878 #ifdef CONFIG_COMPAT
1879 .compat_ioctl
= kvm_vcpu_compat_ioctl
,
1881 .mmap
= kvm_vcpu_mmap
,
1882 .llseek
= noop_llseek
,
1886 * Allocates an inode for the vcpu.
1888 static int create_vcpu_fd(struct kvm_vcpu
*vcpu
)
1890 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops
, vcpu
, O_RDWR
| O_CLOEXEC
);
1894 * Creates some virtual cpus. Good luck creating more than one.
1896 static int kvm_vm_ioctl_create_vcpu(struct kvm
*kvm
, u32 id
)
1899 struct kvm_vcpu
*vcpu
, *v
;
1901 if (id
>= KVM_MAX_VCPUS
)
1904 vcpu
= kvm_arch_vcpu_create(kvm
, id
);
1906 return PTR_ERR(vcpu
);
1908 preempt_notifier_init(&vcpu
->preempt_notifier
, &kvm_preempt_ops
);
1910 r
= kvm_arch_vcpu_setup(vcpu
);
1914 mutex_lock(&kvm
->lock
);
1915 if (!kvm_vcpu_compatible(vcpu
)) {
1917 goto unlock_vcpu_destroy
;
1919 if (atomic_read(&kvm
->online_vcpus
) == KVM_MAX_VCPUS
) {
1921 goto unlock_vcpu_destroy
;
1924 kvm_for_each_vcpu(r
, v
, kvm
)
1925 if (v
->vcpu_id
== id
) {
1927 goto unlock_vcpu_destroy
;
1930 BUG_ON(kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)]);
1932 /* Now it's all set up, let userspace reach it */
1934 r
= create_vcpu_fd(vcpu
);
1937 goto unlock_vcpu_destroy
;
1940 kvm
->vcpus
[atomic_read(&kvm
->online_vcpus
)] = vcpu
;
1942 atomic_inc(&kvm
->online_vcpus
);
1944 mutex_unlock(&kvm
->lock
);
1945 kvm_arch_vcpu_postcreate(vcpu
);
1948 unlock_vcpu_destroy
:
1949 mutex_unlock(&kvm
->lock
);
1951 kvm_arch_vcpu_destroy(vcpu
);
1955 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu
*vcpu
, sigset_t
*sigset
)
1958 sigdelsetmask(sigset
, sigmask(SIGKILL
)|sigmask(SIGSTOP
));
1959 vcpu
->sigset_active
= 1;
1960 vcpu
->sigset
= *sigset
;
1962 vcpu
->sigset_active
= 0;
1966 static long kvm_vcpu_ioctl(struct file
*filp
,
1967 unsigned int ioctl
, unsigned long arg
)
1969 struct kvm_vcpu
*vcpu
= filp
->private_data
;
1970 void __user
*argp
= (void __user
*)arg
;
1972 struct kvm_fpu
*fpu
= NULL
;
1973 struct kvm_sregs
*kvm_sregs
= NULL
;
1975 if (vcpu
->kvm
->mm
!= current
->mm
)
1978 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
1980 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1981 * so vcpu_load() would break it.
1983 if (ioctl
== KVM_S390_INTERRUPT
|| ioctl
== KVM_INTERRUPT
)
1984 return kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
1988 r
= vcpu_load(vcpu
);
1996 r
= kvm_arch_vcpu_ioctl_run(vcpu
, vcpu
->run
);
1997 trace_kvm_userspace_exit(vcpu
->run
->exit_reason
, r
);
1999 case KVM_GET_REGS
: {
2000 struct kvm_regs
*kvm_regs
;
2003 kvm_regs
= kzalloc(sizeof(struct kvm_regs
), GFP_KERNEL
);
2006 r
= kvm_arch_vcpu_ioctl_get_regs(vcpu
, kvm_regs
);
2010 if (copy_to_user(argp
, kvm_regs
, sizeof(struct kvm_regs
)))
2017 case KVM_SET_REGS
: {
2018 struct kvm_regs
*kvm_regs
;
2021 kvm_regs
= memdup_user(argp
, sizeof(*kvm_regs
));
2022 if (IS_ERR(kvm_regs
)) {
2023 r
= PTR_ERR(kvm_regs
);
2026 r
= kvm_arch_vcpu_ioctl_set_regs(vcpu
, kvm_regs
);
2030 case KVM_GET_SREGS
: {
2031 kvm_sregs
= kzalloc(sizeof(struct kvm_sregs
), GFP_KERNEL
);
2035 r
= kvm_arch_vcpu_ioctl_get_sregs(vcpu
, kvm_sregs
);
2039 if (copy_to_user(argp
, kvm_sregs
, sizeof(struct kvm_sregs
)))
2044 case KVM_SET_SREGS
: {
2045 kvm_sregs
= memdup_user(argp
, sizeof(*kvm_sregs
));
2046 if (IS_ERR(kvm_sregs
)) {
2047 r
= PTR_ERR(kvm_sregs
);
2051 r
= kvm_arch_vcpu_ioctl_set_sregs(vcpu
, kvm_sregs
);
2054 case KVM_GET_MP_STATE
: {
2055 struct kvm_mp_state mp_state
;
2057 r
= kvm_arch_vcpu_ioctl_get_mpstate(vcpu
, &mp_state
);
2061 if (copy_to_user(argp
, &mp_state
, sizeof mp_state
))
2066 case KVM_SET_MP_STATE
: {
2067 struct kvm_mp_state mp_state
;
2070 if (copy_from_user(&mp_state
, argp
, sizeof mp_state
))
2072 r
= kvm_arch_vcpu_ioctl_set_mpstate(vcpu
, &mp_state
);
2075 case KVM_TRANSLATE
: {
2076 struct kvm_translation tr
;
2079 if (copy_from_user(&tr
, argp
, sizeof tr
))
2081 r
= kvm_arch_vcpu_ioctl_translate(vcpu
, &tr
);
2085 if (copy_to_user(argp
, &tr
, sizeof tr
))
2090 case KVM_SET_GUEST_DEBUG
: {
2091 struct kvm_guest_debug dbg
;
2094 if (copy_from_user(&dbg
, argp
, sizeof dbg
))
2096 r
= kvm_arch_vcpu_ioctl_set_guest_debug(vcpu
, &dbg
);
2099 case KVM_SET_SIGNAL_MASK
: {
2100 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2101 struct kvm_signal_mask kvm_sigmask
;
2102 sigset_t sigset
, *p
;
2107 if (copy_from_user(&kvm_sigmask
, argp
,
2108 sizeof kvm_sigmask
))
2111 if (kvm_sigmask
.len
!= sizeof sigset
)
2114 if (copy_from_user(&sigset
, sigmask_arg
->sigset
,
2119 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, p
);
2123 fpu
= kzalloc(sizeof(struct kvm_fpu
), GFP_KERNEL
);
2127 r
= kvm_arch_vcpu_ioctl_get_fpu(vcpu
, fpu
);
2131 if (copy_to_user(argp
, fpu
, sizeof(struct kvm_fpu
)))
2137 fpu
= memdup_user(argp
, sizeof(*fpu
));
2143 r
= kvm_arch_vcpu_ioctl_set_fpu(vcpu
, fpu
);
2147 r
= kvm_arch_vcpu_ioctl(filp
, ioctl
, arg
);
2156 #ifdef CONFIG_COMPAT
2157 static long kvm_vcpu_compat_ioctl(struct file
*filp
,
2158 unsigned int ioctl
, unsigned long arg
)
2160 struct kvm_vcpu
*vcpu
= filp
->private_data
;
2161 void __user
*argp
= compat_ptr(arg
);
2164 if (vcpu
->kvm
->mm
!= current
->mm
)
2168 case KVM_SET_SIGNAL_MASK
: {
2169 struct kvm_signal_mask __user
*sigmask_arg
= argp
;
2170 struct kvm_signal_mask kvm_sigmask
;
2171 compat_sigset_t csigset
;
2176 if (copy_from_user(&kvm_sigmask
, argp
,
2177 sizeof kvm_sigmask
))
2180 if (kvm_sigmask
.len
!= sizeof csigset
)
2183 if (copy_from_user(&csigset
, sigmask_arg
->sigset
,
2186 sigset_from_compat(&sigset
, &csigset
);
2187 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, &sigset
);
2189 r
= kvm_vcpu_ioctl_set_sigmask(vcpu
, NULL
);
2193 r
= kvm_vcpu_ioctl(filp
, ioctl
, arg
);
2201 static int kvm_device_ioctl_attr(struct kvm_device
*dev
,
2202 int (*accessor
)(struct kvm_device
*dev
,
2203 struct kvm_device_attr
*attr
),
2206 struct kvm_device_attr attr
;
2211 if (copy_from_user(&attr
, (void __user
*)arg
, sizeof(attr
)))
2214 return accessor(dev
, &attr
);
2217 static long kvm_device_ioctl(struct file
*filp
, unsigned int ioctl
,
2220 struct kvm_device
*dev
= filp
->private_data
;
2223 case KVM_SET_DEVICE_ATTR
:
2224 return kvm_device_ioctl_attr(dev
, dev
->ops
->set_attr
, arg
);
2225 case KVM_GET_DEVICE_ATTR
:
2226 return kvm_device_ioctl_attr(dev
, dev
->ops
->get_attr
, arg
);
2227 case KVM_HAS_DEVICE_ATTR
:
2228 return kvm_device_ioctl_attr(dev
, dev
->ops
->has_attr
, arg
);
2230 if (dev
->ops
->ioctl
)
2231 return dev
->ops
->ioctl(dev
, ioctl
, arg
);
2237 static int kvm_device_release(struct inode
*inode
, struct file
*filp
)
2239 struct kvm_device
*dev
= filp
->private_data
;
2240 struct kvm
*kvm
= dev
->kvm
;
2246 static const struct file_operations kvm_device_fops
= {
2247 .unlocked_ioctl
= kvm_device_ioctl
,
2248 #ifdef CONFIG_COMPAT
2249 .compat_ioctl
= kvm_device_ioctl
,
2251 .release
= kvm_device_release
,
2254 struct kvm_device
*kvm_device_from_filp(struct file
*filp
)
2256 if (filp
->f_op
!= &kvm_device_fops
)
2259 return filp
->private_data
;
2262 static int kvm_ioctl_create_device(struct kvm
*kvm
,
2263 struct kvm_create_device
*cd
)
2265 struct kvm_device_ops
*ops
= NULL
;
2266 struct kvm_device
*dev
;
2267 bool test
= cd
->flags
& KVM_CREATE_DEVICE_TEST
;
2271 #ifdef CONFIG_KVM_MPIC
2272 case KVM_DEV_TYPE_FSL_MPIC_20
:
2273 case KVM_DEV_TYPE_FSL_MPIC_42
:
2274 ops
= &kvm_mpic_ops
;
2277 #ifdef CONFIG_KVM_XICS
2278 case KVM_DEV_TYPE_XICS
:
2279 ops
= &kvm_xics_ops
;
2282 #ifdef CONFIG_KVM_VFIO
2283 case KVM_DEV_TYPE_VFIO
:
2284 ops
= &kvm_vfio_ops
;
2287 #ifdef CONFIG_KVM_ARM_VGIC
2288 case KVM_DEV_TYPE_ARM_VGIC_V2
:
2289 ops
= &kvm_arm_vgic_v2_ops
;
2293 case KVM_DEV_TYPE_FLIC
:
2294 ops
= &kvm_flic_ops
;
2304 dev
= kzalloc(sizeof(*dev
), GFP_KERNEL
);
2311 ret
= ops
->create(dev
, cd
->type
);
2317 ret
= anon_inode_getfd(ops
->name
, &kvm_device_fops
, dev
, O_RDWR
| O_CLOEXEC
);
2323 list_add(&dev
->vm_node
, &kvm
->devices
);
2329 static long kvm_vm_ioctl_check_extension_generic(struct kvm
*kvm
, long arg
)
2332 case KVM_CAP_USER_MEMORY
:
2333 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS
:
2334 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS
:
2335 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2336 case KVM_CAP_SET_BOOT_CPU_ID
:
2338 case KVM_CAP_INTERNAL_ERROR_DATA
:
2339 #ifdef CONFIG_HAVE_KVM_MSI
2340 case KVM_CAP_SIGNAL_MSI
:
2342 #ifdef CONFIG_HAVE_KVM_IRQFD
2343 case KVM_CAP_IRQFD_RESAMPLE
:
2345 case KVM_CAP_CHECK_EXTENSION_VM
:
2347 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2348 case KVM_CAP_IRQ_ROUTING
:
2349 return KVM_MAX_IRQ_ROUTES
;
2354 return kvm_vm_ioctl_check_extension(kvm
, arg
);
2357 static long kvm_vm_ioctl(struct file
*filp
,
2358 unsigned int ioctl
, unsigned long arg
)
2360 struct kvm
*kvm
= filp
->private_data
;
2361 void __user
*argp
= (void __user
*)arg
;
2364 if (kvm
->mm
!= current
->mm
)
2367 case KVM_CREATE_VCPU
:
2368 r
= kvm_vm_ioctl_create_vcpu(kvm
, arg
);
2370 case KVM_SET_USER_MEMORY_REGION
: {
2371 struct kvm_userspace_memory_region kvm_userspace_mem
;
2374 if (copy_from_user(&kvm_userspace_mem
, argp
,
2375 sizeof kvm_userspace_mem
))
2378 r
= kvm_vm_ioctl_set_memory_region(kvm
, &kvm_userspace_mem
);
2381 case KVM_GET_DIRTY_LOG
: {
2382 struct kvm_dirty_log log
;
2385 if (copy_from_user(&log
, argp
, sizeof log
))
2387 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2390 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2391 case KVM_REGISTER_COALESCED_MMIO
: {
2392 struct kvm_coalesced_mmio_zone zone
;
2394 if (copy_from_user(&zone
, argp
, sizeof zone
))
2396 r
= kvm_vm_ioctl_register_coalesced_mmio(kvm
, &zone
);
2399 case KVM_UNREGISTER_COALESCED_MMIO
: {
2400 struct kvm_coalesced_mmio_zone zone
;
2402 if (copy_from_user(&zone
, argp
, sizeof zone
))
2404 r
= kvm_vm_ioctl_unregister_coalesced_mmio(kvm
, &zone
);
2409 struct kvm_irqfd data
;
2412 if (copy_from_user(&data
, argp
, sizeof data
))
2414 r
= kvm_irqfd(kvm
, &data
);
2417 case KVM_IOEVENTFD
: {
2418 struct kvm_ioeventfd data
;
2421 if (copy_from_user(&data
, argp
, sizeof data
))
2423 r
= kvm_ioeventfd(kvm
, &data
);
2426 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2427 case KVM_SET_BOOT_CPU_ID
:
2429 mutex_lock(&kvm
->lock
);
2430 if (atomic_read(&kvm
->online_vcpus
) != 0)
2433 kvm
->bsp_vcpu_id
= arg
;
2434 mutex_unlock(&kvm
->lock
);
2437 #ifdef CONFIG_HAVE_KVM_MSI
2438 case KVM_SIGNAL_MSI
: {
2442 if (copy_from_user(&msi
, argp
, sizeof msi
))
2444 r
= kvm_send_userspace_msi(kvm
, &msi
);
2448 #ifdef __KVM_HAVE_IRQ_LINE
2449 case KVM_IRQ_LINE_STATUS
:
2450 case KVM_IRQ_LINE
: {
2451 struct kvm_irq_level irq_event
;
2454 if (copy_from_user(&irq_event
, argp
, sizeof irq_event
))
2457 r
= kvm_vm_ioctl_irq_line(kvm
, &irq_event
,
2458 ioctl
== KVM_IRQ_LINE_STATUS
);
2463 if (ioctl
== KVM_IRQ_LINE_STATUS
) {
2464 if (copy_to_user(argp
, &irq_event
, sizeof irq_event
))
2472 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2473 case KVM_SET_GSI_ROUTING
: {
2474 struct kvm_irq_routing routing
;
2475 struct kvm_irq_routing __user
*urouting
;
2476 struct kvm_irq_routing_entry
*entries
;
2479 if (copy_from_user(&routing
, argp
, sizeof(routing
)))
2482 if (routing
.nr
>= KVM_MAX_IRQ_ROUTES
)
2487 entries
= vmalloc(routing
.nr
* sizeof(*entries
));
2492 if (copy_from_user(entries
, urouting
->entries
,
2493 routing
.nr
* sizeof(*entries
)))
2494 goto out_free_irq_routing
;
2495 r
= kvm_set_irq_routing(kvm
, entries
, routing
.nr
,
2497 out_free_irq_routing
:
2501 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2502 case KVM_CREATE_DEVICE
: {
2503 struct kvm_create_device cd
;
2506 if (copy_from_user(&cd
, argp
, sizeof(cd
)))
2509 r
= kvm_ioctl_create_device(kvm
, &cd
);
2514 if (copy_to_user(argp
, &cd
, sizeof(cd
)))
2520 case KVM_CHECK_EXTENSION
:
2521 r
= kvm_vm_ioctl_check_extension_generic(kvm
, arg
);
2524 r
= kvm_arch_vm_ioctl(filp
, ioctl
, arg
);
2526 r
= kvm_vm_ioctl_assigned_device(kvm
, ioctl
, arg
);
2532 #ifdef CONFIG_COMPAT
2533 struct compat_kvm_dirty_log
{
2537 compat_uptr_t dirty_bitmap
; /* one bit per page */
2542 static long kvm_vm_compat_ioctl(struct file
*filp
,
2543 unsigned int ioctl
, unsigned long arg
)
2545 struct kvm
*kvm
= filp
->private_data
;
2548 if (kvm
->mm
!= current
->mm
)
2551 case KVM_GET_DIRTY_LOG
: {
2552 struct compat_kvm_dirty_log compat_log
;
2553 struct kvm_dirty_log log
;
2556 if (copy_from_user(&compat_log
, (void __user
*)arg
,
2557 sizeof(compat_log
)))
2559 log
.slot
= compat_log
.slot
;
2560 log
.padding1
= compat_log
.padding1
;
2561 log
.padding2
= compat_log
.padding2
;
2562 log
.dirty_bitmap
= compat_ptr(compat_log
.dirty_bitmap
);
2564 r
= kvm_vm_ioctl_get_dirty_log(kvm
, &log
);
2568 r
= kvm_vm_ioctl(filp
, ioctl
, arg
);
2576 static struct file_operations kvm_vm_fops
= {
2577 .release
= kvm_vm_release
,
2578 .unlocked_ioctl
= kvm_vm_ioctl
,
2579 #ifdef CONFIG_COMPAT
2580 .compat_ioctl
= kvm_vm_compat_ioctl
,
2582 .llseek
= noop_llseek
,
2585 static int kvm_dev_ioctl_create_vm(unsigned long type
)
2590 kvm
= kvm_create_vm(type
);
2592 return PTR_ERR(kvm
);
2593 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2594 r
= kvm_coalesced_mmio_init(kvm
);
2600 r
= anon_inode_getfd("kvm-vm", &kvm_vm_fops
, kvm
, O_RDWR
| O_CLOEXEC
);
2607 static long kvm_dev_ioctl(struct file
*filp
,
2608 unsigned int ioctl
, unsigned long arg
)
2613 case KVM_GET_API_VERSION
:
2617 r
= KVM_API_VERSION
;
2620 r
= kvm_dev_ioctl_create_vm(arg
);
2622 case KVM_CHECK_EXTENSION
:
2623 r
= kvm_vm_ioctl_check_extension_generic(NULL
, arg
);
2625 case KVM_GET_VCPU_MMAP_SIZE
:
2629 r
= PAGE_SIZE
; /* struct kvm_run */
2631 r
+= PAGE_SIZE
; /* pio data page */
2633 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2634 r
+= PAGE_SIZE
; /* coalesced mmio ring page */
2637 case KVM_TRACE_ENABLE
:
2638 case KVM_TRACE_PAUSE
:
2639 case KVM_TRACE_DISABLE
:
2643 return kvm_arch_dev_ioctl(filp
, ioctl
, arg
);
2649 static struct file_operations kvm_chardev_ops
= {
2650 .unlocked_ioctl
= kvm_dev_ioctl
,
2651 .compat_ioctl
= kvm_dev_ioctl
,
2652 .llseek
= noop_llseek
,
2655 static struct miscdevice kvm_dev
= {
2661 static void hardware_enable_nolock(void *junk
)
2663 int cpu
= raw_smp_processor_id();
2666 if (cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2669 cpumask_set_cpu(cpu
, cpus_hardware_enabled
);
2671 r
= kvm_arch_hardware_enable(NULL
);
2674 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2675 atomic_inc(&hardware_enable_failed
);
2676 printk(KERN_INFO
"kvm: enabling virtualization on "
2677 "CPU%d failed\n", cpu
);
2681 static void hardware_enable(void)
2683 raw_spin_lock(&kvm_count_lock
);
2684 if (kvm_usage_count
)
2685 hardware_enable_nolock(NULL
);
2686 raw_spin_unlock(&kvm_count_lock
);
2689 static void hardware_disable_nolock(void *junk
)
2691 int cpu
= raw_smp_processor_id();
2693 if (!cpumask_test_cpu(cpu
, cpus_hardware_enabled
))
2695 cpumask_clear_cpu(cpu
, cpus_hardware_enabled
);
2696 kvm_arch_hardware_disable(NULL
);
2699 static void hardware_disable(void)
2701 raw_spin_lock(&kvm_count_lock
);
2702 if (kvm_usage_count
)
2703 hardware_disable_nolock(NULL
);
2704 raw_spin_unlock(&kvm_count_lock
);
2707 static void hardware_disable_all_nolock(void)
2709 BUG_ON(!kvm_usage_count
);
2712 if (!kvm_usage_count
)
2713 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2716 static void hardware_disable_all(void)
2718 raw_spin_lock(&kvm_count_lock
);
2719 hardware_disable_all_nolock();
2720 raw_spin_unlock(&kvm_count_lock
);
2723 static int hardware_enable_all(void)
2727 raw_spin_lock(&kvm_count_lock
);
2730 if (kvm_usage_count
== 1) {
2731 atomic_set(&hardware_enable_failed
, 0);
2732 on_each_cpu(hardware_enable_nolock
, NULL
, 1);
2734 if (atomic_read(&hardware_enable_failed
)) {
2735 hardware_disable_all_nolock();
2740 raw_spin_unlock(&kvm_count_lock
);
2745 static int kvm_cpu_hotplug(struct notifier_block
*notifier
, unsigned long val
,
2750 val
&= ~CPU_TASKS_FROZEN
;
2753 printk(KERN_INFO
"kvm: disabling virtualization on CPU%d\n",
2758 printk(KERN_INFO
"kvm: enabling virtualization on CPU%d\n",
2766 static int kvm_reboot(struct notifier_block
*notifier
, unsigned long val
,
2770 * Some (well, at least mine) BIOSes hang on reboot if
2773 * And Intel TXT required VMX off for all cpu when system shutdown.
2775 printk(KERN_INFO
"kvm: exiting hardware virtualization\n");
2776 kvm_rebooting
= true;
2777 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
2781 static struct notifier_block kvm_reboot_notifier
= {
2782 .notifier_call
= kvm_reboot
,
2786 static void kvm_io_bus_destroy(struct kvm_io_bus
*bus
)
2790 for (i
= 0; i
< bus
->dev_count
; i
++) {
2791 struct kvm_io_device
*pos
= bus
->range
[i
].dev
;
2793 kvm_iodevice_destructor(pos
);
2798 static inline int kvm_io_bus_cmp(const struct kvm_io_range
*r1
,
2799 const struct kvm_io_range
*r2
)
2801 if (r1
->addr
< r2
->addr
)
2803 if (r1
->addr
+ r1
->len
> r2
->addr
+ r2
->len
)
2808 static int kvm_io_bus_sort_cmp(const void *p1
, const void *p2
)
2810 return kvm_io_bus_cmp(p1
, p2
);
2813 static int kvm_io_bus_insert_dev(struct kvm_io_bus
*bus
, struct kvm_io_device
*dev
,
2814 gpa_t addr
, int len
)
2816 bus
->range
[bus
->dev_count
++] = (struct kvm_io_range
) {
2822 sort(bus
->range
, bus
->dev_count
, sizeof(struct kvm_io_range
),
2823 kvm_io_bus_sort_cmp
, NULL
);
2828 static int kvm_io_bus_get_first_dev(struct kvm_io_bus
*bus
,
2829 gpa_t addr
, int len
)
2831 struct kvm_io_range
*range
, key
;
2834 key
= (struct kvm_io_range
) {
2839 range
= bsearch(&key
, bus
->range
, bus
->dev_count
,
2840 sizeof(struct kvm_io_range
), kvm_io_bus_sort_cmp
);
2844 off
= range
- bus
->range
;
2846 while (off
> 0 && kvm_io_bus_cmp(&key
, &bus
->range
[off
-1]) == 0)
2852 static int __kvm_io_bus_write(struct kvm_io_bus
*bus
,
2853 struct kvm_io_range
*range
, const void *val
)
2857 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2861 while (idx
< bus
->dev_count
&&
2862 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2863 if (!kvm_iodevice_write(bus
->range
[idx
].dev
, range
->addr
,
2872 /* kvm_io_bus_write - called under kvm->slots_lock */
2873 int kvm_io_bus_write(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2874 int len
, const void *val
)
2876 struct kvm_io_bus
*bus
;
2877 struct kvm_io_range range
;
2880 range
= (struct kvm_io_range
) {
2885 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2886 r
= __kvm_io_bus_write(bus
, &range
, val
);
2887 return r
< 0 ? r
: 0;
2890 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
2891 int kvm_io_bus_write_cookie(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2892 int len
, const void *val
, long cookie
)
2894 struct kvm_io_bus
*bus
;
2895 struct kvm_io_range range
;
2897 range
= (struct kvm_io_range
) {
2902 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2904 /* First try the device referenced by cookie. */
2905 if ((cookie
>= 0) && (cookie
< bus
->dev_count
) &&
2906 (kvm_io_bus_cmp(&range
, &bus
->range
[cookie
]) == 0))
2907 if (!kvm_iodevice_write(bus
->range
[cookie
].dev
, addr
, len
,
2912 * cookie contained garbage; fall back to search and return the
2913 * correct cookie value.
2915 return __kvm_io_bus_write(bus
, &range
, val
);
2918 static int __kvm_io_bus_read(struct kvm_io_bus
*bus
, struct kvm_io_range
*range
,
2923 idx
= kvm_io_bus_get_first_dev(bus
, range
->addr
, range
->len
);
2927 while (idx
< bus
->dev_count
&&
2928 kvm_io_bus_cmp(range
, &bus
->range
[idx
]) == 0) {
2929 if (!kvm_iodevice_read(bus
->range
[idx
].dev
, range
->addr
,
2937 EXPORT_SYMBOL_GPL(kvm_io_bus_write
);
2939 /* kvm_io_bus_read - called under kvm->slots_lock */
2940 int kvm_io_bus_read(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2943 struct kvm_io_bus
*bus
;
2944 struct kvm_io_range range
;
2947 range
= (struct kvm_io_range
) {
2952 bus
= srcu_dereference(kvm
->buses
[bus_idx
], &kvm
->srcu
);
2953 r
= __kvm_io_bus_read(bus
, &range
, val
);
2954 return r
< 0 ? r
: 0;
2958 /* Caller must hold slots_lock. */
2959 int kvm_io_bus_register_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
, gpa_t addr
,
2960 int len
, struct kvm_io_device
*dev
)
2962 struct kvm_io_bus
*new_bus
, *bus
;
2964 bus
= kvm
->buses
[bus_idx
];
2965 /* exclude ioeventfd which is limited by maximum fd */
2966 if (bus
->dev_count
- bus
->ioeventfd_count
> NR_IOBUS_DEVS
- 1)
2969 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
+ 1) *
2970 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
2973 memcpy(new_bus
, bus
, sizeof(*bus
) + (bus
->dev_count
*
2974 sizeof(struct kvm_io_range
)));
2975 kvm_io_bus_insert_dev(new_bus
, dev
, addr
, len
);
2976 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
2977 synchronize_srcu_expedited(&kvm
->srcu
);
2983 /* Caller must hold slots_lock. */
2984 int kvm_io_bus_unregister_dev(struct kvm
*kvm
, enum kvm_bus bus_idx
,
2985 struct kvm_io_device
*dev
)
2988 struct kvm_io_bus
*new_bus
, *bus
;
2990 bus
= kvm
->buses
[bus_idx
];
2992 for (i
= 0; i
< bus
->dev_count
; i
++)
2993 if (bus
->range
[i
].dev
== dev
) {
3001 new_bus
= kzalloc(sizeof(*bus
) + ((bus
->dev_count
- 1) *
3002 sizeof(struct kvm_io_range
)), GFP_KERNEL
);
3006 memcpy(new_bus
, bus
, sizeof(*bus
) + i
* sizeof(struct kvm_io_range
));
3007 new_bus
->dev_count
--;
3008 memcpy(new_bus
->range
+ i
, bus
->range
+ i
+ 1,
3009 (new_bus
->dev_count
- i
) * sizeof(struct kvm_io_range
));
3011 rcu_assign_pointer(kvm
->buses
[bus_idx
], new_bus
);
3012 synchronize_srcu_expedited(&kvm
->srcu
);
3017 static struct notifier_block kvm_cpu_notifier
= {
3018 .notifier_call
= kvm_cpu_hotplug
,
3021 static int vm_stat_get(void *_offset
, u64
*val
)
3023 unsigned offset
= (long)_offset
;
3027 spin_lock(&kvm_lock
);
3028 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3029 *val
+= *(u32
*)((void *)kvm
+ offset
);
3030 spin_unlock(&kvm_lock
);
3034 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops
, vm_stat_get
, NULL
, "%llu\n");
3036 static int vcpu_stat_get(void *_offset
, u64
*val
)
3038 unsigned offset
= (long)_offset
;
3040 struct kvm_vcpu
*vcpu
;
3044 spin_lock(&kvm_lock
);
3045 list_for_each_entry(kvm
, &vm_list
, vm_list
)
3046 kvm_for_each_vcpu(i
, vcpu
, kvm
)
3047 *val
+= *(u32
*)((void *)vcpu
+ offset
);
3049 spin_unlock(&kvm_lock
);
3053 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops
, vcpu_stat_get
, NULL
, "%llu\n");
3055 static const struct file_operations
*stat_fops
[] = {
3056 [KVM_STAT_VCPU
] = &vcpu_stat_fops
,
3057 [KVM_STAT_VM
] = &vm_stat_fops
,
3060 static int kvm_init_debug(void)
3063 struct kvm_stats_debugfs_item
*p
;
3065 kvm_debugfs_dir
= debugfs_create_dir("kvm", NULL
);
3066 if (kvm_debugfs_dir
== NULL
)
3069 for (p
= debugfs_entries
; p
->name
; ++p
) {
3070 p
->dentry
= debugfs_create_file(p
->name
, 0444, kvm_debugfs_dir
,
3071 (void *)(long)p
->offset
,
3072 stat_fops
[p
->kind
]);
3073 if (p
->dentry
== NULL
)
3080 debugfs_remove_recursive(kvm_debugfs_dir
);
3085 static void kvm_exit_debug(void)
3087 struct kvm_stats_debugfs_item
*p
;
3089 for (p
= debugfs_entries
; p
->name
; ++p
)
3090 debugfs_remove(p
->dentry
);
3091 debugfs_remove(kvm_debugfs_dir
);
3094 static int kvm_suspend(void)
3096 if (kvm_usage_count
)
3097 hardware_disable_nolock(NULL
);
3101 static void kvm_resume(void)
3103 if (kvm_usage_count
) {
3104 WARN_ON(raw_spin_is_locked(&kvm_count_lock
));
3105 hardware_enable_nolock(NULL
);
3109 static struct syscore_ops kvm_syscore_ops
= {
3110 .suspend
= kvm_suspend
,
3111 .resume
= kvm_resume
,
3115 struct kvm_vcpu
*preempt_notifier_to_vcpu(struct preempt_notifier
*pn
)
3117 return container_of(pn
, struct kvm_vcpu
, preempt_notifier
);
3120 static void kvm_sched_in(struct preempt_notifier
*pn
, int cpu
)
3122 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3123 if (vcpu
->preempted
)
3124 vcpu
->preempted
= false;
3126 kvm_arch_vcpu_load(vcpu
, cpu
);
3129 static void kvm_sched_out(struct preempt_notifier
*pn
,
3130 struct task_struct
*next
)
3132 struct kvm_vcpu
*vcpu
= preempt_notifier_to_vcpu(pn
);
3134 if (current
->state
== TASK_RUNNING
)
3135 vcpu
->preempted
= true;
3136 kvm_arch_vcpu_put(vcpu
);
3139 int kvm_init(void *opaque
, unsigned vcpu_size
, unsigned vcpu_align
,
3140 struct module
*module
)
3145 r
= kvm_arch_init(opaque
);
3150 * kvm_arch_init makes sure there's at most one caller
3151 * for architectures that support multiple implementations,
3152 * like intel and amd on x86.
3153 * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3154 * conflicts in case kvm is already setup for another implementation.
3156 r
= kvm_irqfd_init();
3160 if (!zalloc_cpumask_var(&cpus_hardware_enabled
, GFP_KERNEL
)) {
3165 r
= kvm_arch_hardware_setup();
3169 for_each_online_cpu(cpu
) {
3170 smp_call_function_single(cpu
,
3171 kvm_arch_check_processor_compat
,
3177 r
= register_cpu_notifier(&kvm_cpu_notifier
);
3180 register_reboot_notifier(&kvm_reboot_notifier
);
3182 /* A kmem cache lets us meet the alignment requirements of fx_save. */
3184 vcpu_align
= __alignof__(struct kvm_vcpu
);
3185 kvm_vcpu_cache
= kmem_cache_create("kvm_vcpu", vcpu_size
, vcpu_align
,
3187 if (!kvm_vcpu_cache
) {
3192 r
= kvm_async_pf_init();
3196 kvm_chardev_ops
.owner
= module
;
3197 kvm_vm_fops
.owner
= module
;
3198 kvm_vcpu_fops
.owner
= module
;
3200 r
= misc_register(&kvm_dev
);
3202 printk(KERN_ERR
"kvm: misc device register failed\n");
3206 register_syscore_ops(&kvm_syscore_ops
);
3208 kvm_preempt_ops
.sched_in
= kvm_sched_in
;
3209 kvm_preempt_ops
.sched_out
= kvm_sched_out
;
3211 r
= kvm_init_debug();
3213 printk(KERN_ERR
"kvm: create debugfs files failed\n");
3220 unregister_syscore_ops(&kvm_syscore_ops
);
3221 misc_deregister(&kvm_dev
);
3223 kvm_async_pf_deinit();
3225 kmem_cache_destroy(kvm_vcpu_cache
);
3227 unregister_reboot_notifier(&kvm_reboot_notifier
);
3228 unregister_cpu_notifier(&kvm_cpu_notifier
);
3231 kvm_arch_hardware_unsetup();
3233 free_cpumask_var(cpus_hardware_enabled
);
3241 EXPORT_SYMBOL_GPL(kvm_init
);
3246 misc_deregister(&kvm_dev
);
3247 kmem_cache_destroy(kvm_vcpu_cache
);
3248 kvm_async_pf_deinit();
3249 unregister_syscore_ops(&kvm_syscore_ops
);
3250 unregister_reboot_notifier(&kvm_reboot_notifier
);
3251 unregister_cpu_notifier(&kvm_cpu_notifier
);
3252 on_each_cpu(hardware_disable_nolock
, NULL
, 1);
3253 kvm_arch_hardware_unsetup();
3256 free_cpumask_var(cpus_hardware_enabled
);
3258 EXPORT_SYMBOL_GPL(kvm_exit
);