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TOMOYO Linux Cross Reference
Linux/virt/kvm/kvm_main.c

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  1 /*
  2  * Kernel-based Virtual Machine driver for Linux
  3  *
  4  * This module enables machines with Intel VT-x extensions to run virtual
  5  * machines without emulation or binary translation.
  6  *
  7  * Copyright (C) 2006 Qumranet, Inc.
  8  * Copyright 2010 Red Hat, Inc. and/or its affiliates.
  9  *
 10  * Authors:
 11  *   Avi Kivity   <avi@qumranet.com>
 12  *   Yaniv Kamay  <yaniv@qumranet.com>
 13  *
 14  * This work is licensed under the terms of the GNU GPL, version 2.  See
 15  * the COPYING file in the top-level directory.
 16  *
 17  */
 18 
 19 #include <kvm/iodev.h>
 20 
 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>
 26 #include <linux/mm.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>
 52 
 53 #include <asm/processor.h>
 54 #include <asm/io.h>
 55 #include <asm/ioctl.h>
 56 #include <asm/uaccess.h>
 57 #include <asm/pgtable.h>
 58 
 59 #include "coalesced_mmio.h"
 60 #include "async_pf.h"
 61 #include "vfio.h"
 62 
 63 #define CREATE_TRACE_POINTS
 64 #include <trace/events/kvm.h>
 65 
 66 /* Worst case buffer size needed for holding an integer. */
 67 #define ITOA_MAX_LEN 12
 68 
 69 MODULE_AUTHOR("Qumranet");
 70 MODULE_LICENSE("GPL");
 71 
 72 /* Architectures should define their poll value according to the halt latency */
 73 static unsigned int halt_poll_ns = KVM_HALT_POLL_NS_DEFAULT;
 74 module_param(halt_poll_ns, uint, S_IRUGO | S_IWUSR);
 75 
 76 /* Default doubles per-vcpu halt_poll_ns. */
 77 static unsigned int halt_poll_ns_grow = 2;
 78 module_param(halt_poll_ns_grow, uint, S_IRUGO | S_IWUSR);
 79 
 80 /* Default resets per-vcpu halt_poll_ns . */
 81 static unsigned int halt_poll_ns_shrink;
 82 module_param(halt_poll_ns_shrink, uint, S_IRUGO | S_IWUSR);
 83 
 84 /*
 85  * Ordering of locks:
 86  *
 87  *      kvm->lock --> kvm->slots_lock --> kvm->irq_lock
 88  */
 89 
 90 DEFINE_SPINLOCK(kvm_lock);
 91 static DEFINE_RAW_SPINLOCK(kvm_count_lock);
 92 LIST_HEAD(vm_list);
 93 
 94 static cpumask_var_t cpus_hardware_enabled;
 95 static int kvm_usage_count;
 96 static atomic_t hardware_enable_failed;
 97 
 98 struct kmem_cache *kvm_vcpu_cache;
 99 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
100 
101 static __read_mostly struct preempt_ops kvm_preempt_ops;
102 
103 struct dentry *kvm_debugfs_dir;
104 EXPORT_SYMBOL_GPL(kvm_debugfs_dir);
105 
106 static int kvm_debugfs_num_entries;
107 static const struct file_operations *stat_fops_per_vm[];
108 
109 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
110                            unsigned long arg);
111 #ifdef CONFIG_KVM_COMPAT
112 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
113                                   unsigned long arg);
114 #endif
115 static int hardware_enable_all(void);
116 static void hardware_disable_all(void);
117 
118 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
119 
120 static void kvm_release_pfn_dirty(kvm_pfn_t pfn);
121 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot, gfn_t gfn);
122 
123 __visible bool kvm_rebooting;
124 EXPORT_SYMBOL_GPL(kvm_rebooting);
125 
126 static bool largepages_enabled = true;
127 
128 bool kvm_is_reserved_pfn(kvm_pfn_t pfn)
129 {
130         if (pfn_valid(pfn))
131                 return PageReserved(pfn_to_page(pfn));
132 
133         return true;
134 }
135 
136 /*
137  * Switches to specified vcpu, until a matching vcpu_put()
138  */
139 int vcpu_load(struct kvm_vcpu *vcpu)
140 {
141         int cpu;
142 
143         if (mutex_lock_killable(&vcpu->mutex))
144                 return -EINTR;
145         cpu = get_cpu();
146         preempt_notifier_register(&vcpu->preempt_notifier);
147         kvm_arch_vcpu_load(vcpu, cpu);
148         put_cpu();
149         return 0;
150 }
151 EXPORT_SYMBOL_GPL(vcpu_load);
152 
153 void vcpu_put(struct kvm_vcpu *vcpu)
154 {
155         preempt_disable();
156         kvm_arch_vcpu_put(vcpu);
157         preempt_notifier_unregister(&vcpu->preempt_notifier);
158         preempt_enable();
159         mutex_unlock(&vcpu->mutex);
160 }
161 EXPORT_SYMBOL_GPL(vcpu_put);
162 
163 static void ack_flush(void *_completed)
164 {
165 }
166 
167 bool kvm_make_all_cpus_request(struct kvm *kvm, unsigned int req)
168 {
169         int i, cpu, me;
170         cpumask_var_t cpus;
171         bool called = true;
172         struct kvm_vcpu *vcpu;
173 
174         zalloc_cpumask_var(&cpus, GFP_ATOMIC);
175 
176         me = get_cpu();
177         kvm_for_each_vcpu(i, vcpu, kvm) {
178                 kvm_make_request(req, vcpu);
179                 cpu = vcpu->cpu;
180 
181                 /* Set ->requests bit before we read ->mode. */
182                 smp_mb__after_atomic();
183 
184                 if (cpus != NULL && cpu != -1 && cpu != me &&
185                       kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
186                         cpumask_set_cpu(cpu, cpus);
187         }
188         if (unlikely(cpus == NULL))
189                 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
190         else if (!cpumask_empty(cpus))
191                 smp_call_function_many(cpus, ack_flush, NULL, 1);
192         else
193                 called = false;
194         put_cpu();
195         free_cpumask_var(cpus);
196         return called;
197 }
198 
199 #ifndef CONFIG_HAVE_KVM_ARCH_TLB_FLUSH_ALL
200 void kvm_flush_remote_tlbs(struct kvm *kvm)
201 {
202         /*
203          * Read tlbs_dirty before setting KVM_REQ_TLB_FLUSH in
204          * kvm_make_all_cpus_request.
205          */
206         long dirty_count = smp_load_acquire(&kvm->tlbs_dirty);
207 
208         /*
209          * We want to publish modifications to the page tables before reading
210          * mode. Pairs with a memory barrier in arch-specific code.
211          * - x86: smp_mb__after_srcu_read_unlock in vcpu_enter_guest
212          * and smp_mb in walk_shadow_page_lockless_begin/end.
213          * - powerpc: smp_mb in kvmppc_prepare_to_enter.
214          *
215          * There is already an smp_mb__after_atomic() before
216          * kvm_make_all_cpus_request() reads vcpu->mode. We reuse that
217          * barrier here.
218          */
219         if (kvm_make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
220                 ++kvm->stat.remote_tlb_flush;
221         cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
222 }
223 EXPORT_SYMBOL_GPL(kvm_flush_remote_tlbs);
224 #endif
225 
226 void kvm_reload_remote_mmus(struct kvm *kvm)
227 {
228         kvm_make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
229 }
230 
231 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
232 {
233         struct page *page;
234         int r;
235 
236         mutex_init(&vcpu->mutex);
237         vcpu->cpu = -1;
238         vcpu->kvm = kvm;
239         vcpu->vcpu_id = id;
240         vcpu->pid = NULL;
241         init_swait_queue_head(&vcpu->wq);
242         kvm_async_pf_vcpu_init(vcpu);
243 
244         vcpu->pre_pcpu = -1;
245         INIT_LIST_HEAD(&vcpu->blocked_vcpu_list);
246 
247         page = alloc_page(GFP_KERNEL | __GFP_ZERO);
248         if (!page) {
249                 r = -ENOMEM;
250                 goto fail;
251         }
252         vcpu->run = page_address(page);
253 
254         kvm_vcpu_set_in_spin_loop(vcpu, false);
255         kvm_vcpu_set_dy_eligible(vcpu, false);
256         vcpu->preempted = false;
257 
258         r = kvm_arch_vcpu_init(vcpu);
259         if (r < 0)
260                 goto fail_free_run;
261         return 0;
262 
263 fail_free_run:
264         free_page((unsigned long)vcpu->run);
265 fail:
266         return r;
267 }
268 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
269 
270 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
271 {
272         put_pid(vcpu->pid);
273         kvm_arch_vcpu_uninit(vcpu);
274         free_page((unsigned long)vcpu->run);
275 }
276 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
277 
278 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
279 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
280 {
281         return container_of(mn, struct kvm, mmu_notifier);
282 }
283 
284 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
285                                              struct mm_struct *mm,
286                                              unsigned long address)
287 {
288         struct kvm *kvm = mmu_notifier_to_kvm(mn);
289         int need_tlb_flush, idx;
290 
291         /*
292          * When ->invalidate_page runs, the linux pte has been zapped
293          * already but the page is still allocated until
294          * ->invalidate_page returns. So if we increase the sequence
295          * here the kvm page fault will notice if the spte can't be
296          * established because the page is going to be freed. If
297          * instead the kvm page fault establishes the spte before
298          * ->invalidate_page runs, kvm_unmap_hva will release it
299          * before returning.
300          *
301          * The sequence increase only need to be seen at spin_unlock
302          * time, and not at spin_lock time.
303          *
304          * Increasing the sequence after the spin_unlock would be
305          * unsafe because the kvm page fault could then establish the
306          * pte after kvm_unmap_hva returned, without noticing the page
307          * is going to be freed.
308          */
309         idx = srcu_read_lock(&kvm->srcu);
310         spin_lock(&kvm->mmu_lock);
311 
312         kvm->mmu_notifier_seq++;
313         need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
314         /* we've to flush the tlb before the pages can be freed */
315         if (need_tlb_flush)
316                 kvm_flush_remote_tlbs(kvm);
317 
318         spin_unlock(&kvm->mmu_lock);
319 
320         kvm_arch_mmu_notifier_invalidate_page(kvm, address);
321 
322         srcu_read_unlock(&kvm->srcu, idx);
323 }
324 
325 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
326                                         struct mm_struct *mm,
327                                         unsigned long address,
328                                         pte_t pte)
329 {
330         struct kvm *kvm = mmu_notifier_to_kvm(mn);
331         int idx;
332 
333         idx = srcu_read_lock(&kvm->srcu);
334         spin_lock(&kvm->mmu_lock);
335         kvm->mmu_notifier_seq++;
336         kvm_set_spte_hva(kvm, address, pte);
337         spin_unlock(&kvm->mmu_lock);
338         srcu_read_unlock(&kvm->srcu, idx);
339 }
340 
341 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
342                                                     struct mm_struct *mm,
343                                                     unsigned long start,
344                                                     unsigned long end)
345 {
346         struct kvm *kvm = mmu_notifier_to_kvm(mn);
347         int need_tlb_flush = 0, idx;
348 
349         idx = srcu_read_lock(&kvm->srcu);
350         spin_lock(&kvm->mmu_lock);
351         /*
352          * The count increase must become visible at unlock time as no
353          * spte can be established without taking the mmu_lock and
354          * count is also read inside the mmu_lock critical section.
355          */
356         kvm->mmu_notifier_count++;
357         need_tlb_flush = kvm_unmap_hva_range(kvm, start, end);
358         need_tlb_flush |= kvm->tlbs_dirty;
359         /* we've to flush the tlb before the pages can be freed */
360         if (need_tlb_flush)
361                 kvm_flush_remote_tlbs(kvm);
362 
363         spin_unlock(&kvm->mmu_lock);
364         srcu_read_unlock(&kvm->srcu, idx);
365 }
366 
367 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
368                                                   struct mm_struct *mm,
369                                                   unsigned long start,
370                                                   unsigned long end)
371 {
372         struct kvm *kvm = mmu_notifier_to_kvm(mn);
373 
374         spin_lock(&kvm->mmu_lock);
375         /*
376          * This sequence increase will notify the kvm page fault that
377          * the page that is going to be mapped in the spte could have
378          * been freed.
379          */
380         kvm->mmu_notifier_seq++;
381         smp_wmb();
382         /*
383          * The above sequence increase must be visible before the
384          * below count decrease, which is ensured by the smp_wmb above
385          * in conjunction with the smp_rmb in mmu_notifier_retry().
386          */
387         kvm->mmu_notifier_count--;
388         spin_unlock(&kvm->mmu_lock);
389 
390         BUG_ON(kvm->mmu_notifier_count < 0);
391 }
392 
393 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
394                                               struct mm_struct *mm,
395                                               unsigned long start,
396                                               unsigned long end)
397 {
398         struct kvm *kvm = mmu_notifier_to_kvm(mn);
399         int young, idx;
400 
401         idx = srcu_read_lock(&kvm->srcu);
402         spin_lock(&kvm->mmu_lock);
403 
404         young = kvm_age_hva(kvm, start, end);
405         if (young)
406                 kvm_flush_remote_tlbs(kvm);
407 
408         spin_unlock(&kvm->mmu_lock);
409         srcu_read_unlock(&kvm->srcu, idx);
410 
411         return young;
412 }
413 
414 static int kvm_mmu_notifier_clear_young(struct mmu_notifier *mn,
415                                         struct mm_struct *mm,
416                                         unsigned long start,
417                                         unsigned long end)
418 {
419         struct kvm *kvm = mmu_notifier_to_kvm(mn);
420         int young, idx;
421 
422         idx = srcu_read_lock(&kvm->srcu);
423         spin_lock(&kvm->mmu_lock);
424         /*
425          * Even though we do not flush TLB, this will still adversely
426          * affect performance on pre-Haswell Intel EPT, where there is
427          * no EPT Access Bit to clear so that we have to tear down EPT
428          * tables instead. If we find this unacceptable, we can always
429          * add a parameter to kvm_age_hva so that it effectively doesn't
430          * do anything on clear_young.
431          *
432          * Also note that currently we never issue secondary TLB flushes
433          * from clear_young, leaving this job up to the regular system
434          * cadence. If we find this inaccurate, we might come up with a
435          * more sophisticated heuristic later.
436          */
437         young = kvm_age_hva(kvm, start, end);
438         spin_unlock(&kvm->mmu_lock);
439         srcu_read_unlock(&kvm->srcu, idx);
440 
441         return young;
442 }
443 
444 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
445                                        struct mm_struct *mm,
446                                        unsigned long address)
447 {
448         struct kvm *kvm = mmu_notifier_to_kvm(mn);
449         int young, idx;
450 
451         idx = srcu_read_lock(&kvm->srcu);
452         spin_lock(&kvm->mmu_lock);
453         young = kvm_test_age_hva(kvm, address);
454         spin_unlock(&kvm->mmu_lock);
455         srcu_read_unlock(&kvm->srcu, idx);
456 
457         return young;
458 }
459 
460 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
461                                      struct mm_struct *mm)
462 {
463         struct kvm *kvm = mmu_notifier_to_kvm(mn);
464         int idx;
465 
466         idx = srcu_read_lock(&kvm->srcu);
467         kvm_arch_flush_shadow_all(kvm);
468         srcu_read_unlock(&kvm->srcu, idx);
469 }
470 
471 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
472         .invalidate_page        = kvm_mmu_notifier_invalidate_page,
473         .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
474         .invalidate_range_end   = kvm_mmu_notifier_invalidate_range_end,
475         .clear_flush_young      = kvm_mmu_notifier_clear_flush_young,
476         .clear_young            = kvm_mmu_notifier_clear_young,
477         .test_young             = kvm_mmu_notifier_test_young,
478         .change_pte             = kvm_mmu_notifier_change_pte,
479         .release                = kvm_mmu_notifier_release,
480 };
481 
482 static int kvm_init_mmu_notifier(struct kvm *kvm)
483 {
484         kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
485         return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
486 }
487 
488 #else  /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
489 
490 static int kvm_init_mmu_notifier(struct kvm *kvm)
491 {
492         return 0;
493 }
494 
495 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
496 
497 static struct kvm_memslots *kvm_alloc_memslots(void)
498 {
499         int i;
500         struct kvm_memslots *slots;
501 
502         slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
503         if (!slots)
504                 return NULL;
505 
506         /*
507          * Init kvm generation close to the maximum to easily test the
508          * code of handling generation number wrap-around.
509          */
510         slots->generation = -150;
511         for (i = 0; i < KVM_MEM_SLOTS_NUM; i++)
512                 slots->id_to_index[i] = slots->memslots[i].id = i;
513 
514         return slots;
515 }
516 
517 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
518 {
519         if (!memslot->dirty_bitmap)
520                 return;
521 
522         kvfree(memslot->dirty_bitmap);
523         memslot->dirty_bitmap = NULL;
524 }
525 
526 /*
527  * Free any memory in @free but not in @dont.
528  */
529 static void kvm_free_memslot(struct kvm *kvm, struct kvm_memory_slot *free,
530                               struct kvm_memory_slot *dont)
531 {
532         if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
533                 kvm_destroy_dirty_bitmap(free);
534 
535         kvm_arch_free_memslot(kvm, free, dont);
536 
537         free->npages = 0;
538 }
539 
540 static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
541 {
542         struct kvm_memory_slot *memslot;
543 
544         if (!slots)
545                 return;
546 
547         kvm_for_each_memslot(memslot, slots)
548                 kvm_free_memslot(kvm, memslot, NULL);
549 
550         kvfree(slots);
551 }
552 
553 static void kvm_destroy_vm_debugfs(struct kvm *kvm)
554 {
555         int i;
556 
557         if (!kvm->debugfs_dentry)
558                 return;
559 
560         debugfs_remove_recursive(kvm->debugfs_dentry);
561 
562         for (i = 0; i < kvm_debugfs_num_entries; i++)
563                 kfree(kvm->debugfs_stat_data[i]);
564         kfree(kvm->debugfs_stat_data);
565 }
566 
567 static int kvm_create_vm_debugfs(struct kvm *kvm, int fd)
568 {
569         char dir_name[ITOA_MAX_LEN * 2];
570         struct kvm_stat_data *stat_data;
571         struct kvm_stats_debugfs_item *p;
572 
573         if (!debugfs_initialized())
574                 return 0;
575 
576         snprintf(dir_name, sizeof(dir_name), "%d-%d", task_pid_nr(current), fd);
577         kvm->debugfs_dentry = debugfs_create_dir(dir_name,
578                                                  kvm_debugfs_dir);
579         if (!kvm->debugfs_dentry)
580                 return -ENOMEM;
581 
582         kvm->debugfs_stat_data = kcalloc(kvm_debugfs_num_entries,
583                                          sizeof(*kvm->debugfs_stat_data),
584                                          GFP_KERNEL);
585         if (!kvm->debugfs_stat_data)
586                 return -ENOMEM;
587 
588         for (p = debugfs_entries; p->name; p++) {
589                 stat_data = kzalloc(sizeof(*stat_data), GFP_KERNEL);
590                 if (!stat_data)
591                         return -ENOMEM;
592 
593                 stat_data->kvm = kvm;
594                 stat_data->offset = p->offset;
595                 kvm->debugfs_stat_data[p - debugfs_entries] = stat_data;
596                 if (!debugfs_create_file(p->name, 0444,
597                                          kvm->debugfs_dentry,
598                                          stat_data,
599                                          stat_fops_per_vm[p->kind]))
600                         return -ENOMEM;
601         }
602         return 0;
603 }
604 
605 static struct kvm *kvm_create_vm(unsigned long type)
606 {
607         int r, i;
608         struct kvm *kvm = kvm_arch_alloc_vm();
609 
610         if (!kvm)
611                 return ERR_PTR(-ENOMEM);
612 
613         spin_lock_init(&kvm->mmu_lock);
614         atomic_inc(&current->mm->mm_count);
615         kvm->mm = current->mm;
616         kvm_eventfd_init(kvm);
617         mutex_init(&kvm->lock);
618         mutex_init(&kvm->irq_lock);
619         mutex_init(&kvm->slots_lock);
620         atomic_set(&kvm->users_count, 1);
621         INIT_LIST_HEAD(&kvm->devices);
622 
623         r = kvm_arch_init_vm(kvm, type);
624         if (r)
625                 goto out_err_no_disable;
626 
627         r = hardware_enable_all();
628         if (r)
629                 goto out_err_no_disable;
630 
631 #ifdef CONFIG_HAVE_KVM_IRQFD
632         INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
633 #endif
634 
635         BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
636 
637         r = -ENOMEM;
638         for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++) {
639                 kvm->memslots[i] = kvm_alloc_memslots();
640                 if (!kvm->memslots[i])
641                         goto out_err_no_srcu;
642         }
643 
644         if (init_srcu_struct(&kvm->srcu))
645                 goto out_err_no_srcu;
646         if (init_srcu_struct(&kvm->irq_srcu))
647                 goto out_err_no_irq_srcu;
648         for (i = 0; i < KVM_NR_BUSES; i++) {
649                 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
650                                         GFP_KERNEL);
651                 if (!kvm->buses[i])
652                         goto out_err;
653         }
654 
655         r = kvm_init_mmu_notifier(kvm);
656         if (r)
657                 goto out_err;
658 
659         spin_lock(&kvm_lock);
660         list_add(&kvm->vm_list, &vm_list);
661         spin_unlock(&kvm_lock);
662 
663         preempt_notifier_inc();
664 
665         return kvm;
666 
667 out_err:
668         cleanup_srcu_struct(&kvm->irq_srcu);
669 out_err_no_irq_srcu:
670         cleanup_srcu_struct(&kvm->srcu);
671 out_err_no_srcu:
672         hardware_disable_all();
673 out_err_no_disable:
674         for (i = 0; i < KVM_NR_BUSES; i++)
675                 kfree(kvm->buses[i]);
676         for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
677                 kvm_free_memslots(kvm, kvm->memslots[i]);
678         kvm_arch_free_vm(kvm);
679         mmdrop(current->mm);
680         return ERR_PTR(r);
681 }
682 
683 /*
684  * Avoid using vmalloc for a small buffer.
685  * Should not be used when the size is statically known.
686  */
687 void *kvm_kvzalloc(unsigned long size)
688 {
689         if (size > PAGE_SIZE)
690                 return vzalloc(size);
691         else
692                 return kzalloc(size, GFP_KERNEL);
693 }
694 
695 static void kvm_destroy_devices(struct kvm *kvm)
696 {
697         struct kvm_device *dev, *tmp;
698 
699         list_for_each_entry_safe(dev, tmp, &kvm->devices, vm_node) {
700                 list_del(&dev->vm_node);
701                 dev->ops->destroy(dev);
702         }
703 }
704 
705 static void kvm_destroy_vm(struct kvm *kvm)
706 {
707         int i;
708         struct mm_struct *mm = kvm->mm;
709 
710         kvm_destroy_vm_debugfs(kvm);
711         kvm_arch_sync_events(kvm);
712         spin_lock(&kvm_lock);
713         list_del(&kvm->vm_list);
714         spin_unlock(&kvm_lock);
715         kvm_free_irq_routing(kvm);
716         for (i = 0; i < KVM_NR_BUSES; i++)
717                 kvm_io_bus_destroy(kvm->buses[i]);
718         kvm_coalesced_mmio_free(kvm);
719 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
720         mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
721 #else
722         kvm_arch_flush_shadow_all(kvm);
723 #endif
724         kvm_arch_destroy_vm(kvm);
725         kvm_destroy_devices(kvm);
726         for (i = 0; i < KVM_ADDRESS_SPACE_NUM; i++)
727                 kvm_free_memslots(kvm, kvm->memslots[i]);
728         cleanup_srcu_struct(&kvm->irq_srcu);
729         cleanup_srcu_struct(&kvm->srcu);
730         kvm_arch_free_vm(kvm);
731         preempt_notifier_dec();
732         hardware_disable_all();
733         mmdrop(mm);
734 }
735 
736 void kvm_get_kvm(struct kvm *kvm)
737 {
738         atomic_inc(&kvm->users_count);
739 }
740 EXPORT_SYMBOL_GPL(kvm_get_kvm);
741 
742 void kvm_put_kvm(struct kvm *kvm)
743 {
744         if (atomic_dec_and_test(&kvm->users_count))
745                 kvm_destroy_vm(kvm);
746 }
747 EXPORT_SYMBOL_GPL(kvm_put_kvm);
748 
749 
750 static int kvm_vm_release(struct inode *inode, struct file *filp)
751 {
752         struct kvm *kvm = filp->private_data;
753 
754         kvm_irqfd_release(kvm);
755 
756         kvm_put_kvm(kvm);
757         return 0;
758 }
759 
760 /*
761  * Allocation size is twice as large as the actual dirty bitmap size.
762  * See x86's kvm_vm_ioctl_get_dirty_log() why this is needed.
763  */
764 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
765 {
766         unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
767 
768         memslot->dirty_bitmap = kvm_kvzalloc(dirty_bytes);
769         if (!memslot->dirty_bitmap)
770                 return -ENOMEM;
771 
772         return 0;
773 }
774 
775 /*
776  * Insert memslot and re-sort memslots based on their GFN,
777  * so binary search could be used to lookup GFN.
778  * Sorting algorithm takes advantage of having initially
779  * sorted array and known changed memslot position.
780  */
781 static void update_memslots(struct kvm_memslots *slots,
782                             struct kvm_memory_slot *new)
783 {
784         int id = new->id;
785         int i = slots->id_to_index[id];
786         struct kvm_memory_slot *mslots = slots->memslots;
787 
788         WARN_ON(mslots[i].id != id);
789         if (!new->npages) {
790                 WARN_ON(!mslots[i].npages);
791                 if (mslots[i].npages)
792                         slots->used_slots--;
793         } else {
794                 if (!mslots[i].npages)
795                         slots->used_slots++;
796         }
797 
798         while (i < KVM_MEM_SLOTS_NUM - 1 &&
799                new->base_gfn <= mslots[i + 1].base_gfn) {
800                 if (!mslots[i + 1].npages)
801                         break;
802                 mslots[i] = mslots[i + 1];
803                 slots->id_to_index[mslots[i].id] = i;
804                 i++;
805         }
806 
807         /*
808          * The ">=" is needed when creating a slot with base_gfn == 0,
809          * so that it moves before all those with base_gfn == npages == 0.
810          *
811          * On the other hand, if new->npages is zero, the above loop has
812          * already left i pointing to the beginning of the empty part of
813          * mslots, and the ">=" would move the hole backwards in this
814          * case---which is wrong.  So skip the loop when deleting a slot.
815          */
816         if (new->npages) {
817                 while (i > 0 &&
818                        new->base_gfn >= mslots[i - 1].base_gfn) {
819                         mslots[i] = mslots[i - 1];
820                         slots->id_to_index[mslots[i].id] = i;
821                         i--;
822                 }
823         } else
824                 WARN_ON_ONCE(i != slots->used_slots);
825 
826         mslots[i] = *new;
827         slots->id_to_index[mslots[i].id] = i;
828 }
829 
830 static int check_memory_region_flags(const struct kvm_userspace_memory_region *mem)
831 {
832         u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
833 
834 #ifdef __KVM_HAVE_READONLY_MEM
835         valid_flags |= KVM_MEM_READONLY;
836 #endif
837 
838         if (mem->flags & ~valid_flags)
839                 return -EINVAL;
840 
841         return 0;
842 }
843 
844 static struct kvm_memslots *install_new_memslots(struct kvm *kvm,
845                 int as_id, struct kvm_memslots *slots)
846 {
847         struct kvm_memslots *old_memslots = __kvm_memslots(kvm, as_id);
848 
849         /*
850          * Set the low bit in the generation, which disables SPTE caching
851          * until the end of synchronize_srcu_expedited.
852          */
853         WARN_ON(old_memslots->generation & 1);
854         slots->generation = old_memslots->generation + 1;
855 
856         rcu_assign_pointer(kvm->memslots[as_id], slots);
857         synchronize_srcu_expedited(&kvm->srcu);
858 
859         /*
860          * Increment the new memslot generation a second time. This prevents
861          * vm exits that race with memslot updates from caching a memslot
862          * generation that will (potentially) be valid forever.
863          */
864         slots->generation++;
865 
866         kvm_arch_memslots_updated(kvm, slots);
867 
868         return old_memslots;
869 }
870 
871 /*
872  * Allocate some memory and give it an address in the guest physical address
873  * space.
874  *
875  * Discontiguous memory is allowed, mostly for framebuffers.
876  *
877  * Must be called holding kvm->slots_lock for write.
878  */
879 int __kvm_set_memory_region(struct kvm *kvm,
880                             const struct kvm_userspace_memory_region *mem)
881 {
882         int r;
883         gfn_t base_gfn;
884         unsigned long npages;
885         struct kvm_memory_slot *slot;
886         struct kvm_memory_slot old, new;
887         struct kvm_memslots *slots = NULL, *old_memslots;
888         int as_id, id;
889         enum kvm_mr_change change;
890 
891         r = check_memory_region_flags(mem);
892         if (r)
893                 goto out;
894 
895         r = -EINVAL;
896         as_id = mem->slot >> 16;
897         id = (u16)mem->slot;
898 
899         /* General sanity checks */
900         if (mem->memory_size & (PAGE_SIZE - 1))
901                 goto out;
902         if (mem->guest_phys_addr & (PAGE_SIZE - 1))
903                 goto out;
904         /* We can read the guest memory with __xxx_user() later on. */
905         if ((id < KVM_USER_MEM_SLOTS) &&
906             ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
907              !access_ok(VERIFY_WRITE,
908                         (void __user *)(unsigned long)mem->userspace_addr,
909                         mem->memory_size)))
910                 goto out;
911         if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_MEM_SLOTS_NUM)
912                 goto out;
913         if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
914                 goto out;
915 
916         slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
917         base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
918         npages = mem->memory_size >> PAGE_SHIFT;
919 
920         if (npages > KVM_MEM_MAX_NR_PAGES)
921                 goto out;
922 
923         new = old = *slot;
924 
925         new.id = id;
926         new.base_gfn = base_gfn;
927         new.npages = npages;
928         new.flags = mem->flags;
929 
930         if (npages) {
931                 if (!old.npages)
932                         change = KVM_MR_CREATE;
933                 else { /* Modify an existing slot. */
934                         if ((mem->userspace_addr != old.userspace_addr) ||
935                             (npages != old.npages) ||
936                             ((new.flags ^ old.flags) & KVM_MEM_READONLY))
937                                 goto out;
938 
939                         if (base_gfn != old.base_gfn)
940                                 change = KVM_MR_MOVE;
941                         else if (new.flags != old.flags)
942                                 change = KVM_MR_FLAGS_ONLY;
943                         else { /* Nothing to change. */
944                                 r = 0;
945                                 goto out;
946                         }
947                 }
948         } else {
949                 if (!old.npages)
950                         goto out;
951 
952                 change = KVM_MR_DELETE;
953                 new.base_gfn = 0;
954                 new.flags = 0;
955         }
956 
957         if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
958                 /* Check for overlaps */
959                 r = -EEXIST;
960                 kvm_for_each_memslot(slot, __kvm_memslots(kvm, as_id)) {
961                         if ((slot->id >= KVM_USER_MEM_SLOTS) ||
962                             (slot->id == id))
963                                 continue;
964                         if (!((base_gfn + npages <= slot->base_gfn) ||
965                               (base_gfn >= slot->base_gfn + slot->npages)))
966                                 goto out;
967                 }
968         }
969 
970         /* Free page dirty bitmap if unneeded */
971         if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
972                 new.dirty_bitmap = NULL;
973 
974         r = -ENOMEM;
975         if (change == KVM_MR_CREATE) {
976                 new.userspace_addr = mem->userspace_addr;
977 
978                 if (kvm_arch_create_memslot(kvm, &new, npages))
979                         goto out_free;
980         }
981 
982         /* Allocate page dirty bitmap if needed */
983         if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
984                 if (kvm_create_dirty_bitmap(&new) < 0)
985                         goto out_free;
986         }
987 
988         slots = kvm_kvzalloc(sizeof(struct kvm_memslots));
989         if (!slots)
990                 goto out_free;
991         memcpy(slots, __kvm_memslots(kvm, as_id), sizeof(struct kvm_memslots));
992 
993         if ((change == KVM_MR_DELETE) || (change == KVM_MR_MOVE)) {
994                 slot = id_to_memslot(slots, id);
995                 slot->flags |= KVM_MEMSLOT_INVALID;
996 
997                 old_memslots = install_new_memslots(kvm, as_id, slots);
998 
999                 /* slot was deleted or moved, clear iommu mapping */
1000                 kvm_iommu_unmap_pages(kvm, &old);
1001                 /* From this point no new shadow pages pointing to a deleted,
1002                  * or moved, memslot will be created.
1003                  *
1004                  * validation of sp->gfn happens in:
1005                  *      - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
1006                  *      - kvm_is_visible_gfn (mmu_check_roots)
1007                  */
1008                 kvm_arch_flush_shadow_memslot(kvm, slot);
1009 
1010                 /*
1011                  * We can re-use the old_memslots from above, the only difference
1012                  * from the currently installed memslots is the invalid flag.  This
1013                  * will get overwritten by update_memslots anyway.
1014                  */
1015                 slots = old_memslots;
1016         }
1017 
1018         r = kvm_arch_prepare_memory_region(kvm, &new, mem, change);
1019         if (r)
1020                 goto out_slots;
1021 
1022         /* actual memory is freed via old in kvm_free_memslot below */
1023         if (change == KVM_MR_DELETE) {
1024                 new.dirty_bitmap = NULL;
1025                 memset(&new.arch, 0, sizeof(new.arch));
1026         }
1027 
1028         update_memslots(slots, &new);
1029         old_memslots = install_new_memslots(kvm, as_id, slots);
1030 
1031         kvm_arch_commit_memory_region(kvm, mem, &old, &new, change);
1032 
1033         kvm_free_memslot(kvm, &old, &new);
1034         kvfree(old_memslots);
1035 
1036         /*
1037          * IOMMU mapping:  New slots need to be mapped.  Old slots need to be
1038          * un-mapped and re-mapped if their base changes.  Since base change
1039          * unmapping is handled above with slot deletion, mapping alone is
1040          * needed here.  Anything else the iommu might care about for existing
1041          * slots (size changes, userspace addr changes and read-only flag
1042          * changes) is disallowed above, so any other attribute changes getting
1043          * here can be skipped.
1044          */
1045         if ((change == KVM_MR_CREATE) || (change == KVM_MR_MOVE)) {
1046                 r = kvm_iommu_map_pages(kvm, &new);
1047                 return r;
1048         }
1049 
1050         return 0;
1051 
1052 out_slots:
1053         kvfree(slots);
1054 out_free:
1055         kvm_free_memslot(kvm, &new, &old);
1056 out:
1057         return r;
1058 }
1059 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1060 
1061 int kvm_set_memory_region(struct kvm *kvm,
1062                           const struct kvm_userspace_memory_region *mem)
1063 {
1064         int r;
1065 
1066         mutex_lock(&kvm->slots_lock);
1067         r = __kvm_set_memory_region(kvm, mem);
1068         mutex_unlock(&kvm->slots_lock);
1069         return r;
1070 }
1071 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1072 
1073 static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1074                                           struct kvm_userspace_memory_region *mem)
1075 {
1076         if ((u16)mem->slot >= KVM_USER_MEM_SLOTS)
1077                 return -EINVAL;
1078 
1079         return kvm_set_memory_region(kvm, mem);
1080 }
1081 
1082 int kvm_get_dirty_log(struct kvm *kvm,
1083                         struct kvm_dirty_log *log, int *is_dirty)
1084 {
1085         struct kvm_memslots *slots;
1086         struct kvm_memory_slot *memslot;
1087         int r, i, as_id, id;
1088         unsigned long n;
1089         unsigned long any = 0;
1090 
1091         r = -EINVAL;
1092         as_id = log->slot >> 16;
1093         id = (u16)log->slot;
1094         if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1095                 goto out;
1096 
1097         slots = __kvm_memslots(kvm, as_id);
1098         memslot = id_to_memslot(slots, id);
1099         r = -ENOENT;
1100         if (!memslot->dirty_bitmap)
1101                 goto out;
1102 
1103         n = kvm_dirty_bitmap_bytes(memslot);
1104 
1105         for (i = 0; !any && i < n/sizeof(long); ++i)
1106                 any = memslot->dirty_bitmap[i];
1107 
1108         r = -EFAULT;
1109         if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1110                 goto out;
1111 
1112         if (any)
1113                 *is_dirty = 1;
1114 
1115         r = 0;
1116 out:
1117         return r;
1118 }
1119 EXPORT_SYMBOL_GPL(kvm_get_dirty_log);
1120 
1121 #ifdef CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT
1122 /**
1123  * kvm_get_dirty_log_protect - get a snapshot of dirty pages, and if any pages
1124  *      are dirty write protect them for next write.
1125  * @kvm:        pointer to kvm instance
1126  * @log:        slot id and address to which we copy the log
1127  * @is_dirty:   flag set if any page is dirty
1128  *
1129  * We need to keep it in mind that VCPU threads can write to the bitmap
1130  * concurrently. So, to avoid losing track of dirty pages we keep the
1131  * following order:
1132  *
1133  *    1. Take a snapshot of the bit and clear it if needed.
1134  *    2. Write protect the corresponding page.
1135  *    3. Copy the snapshot to the userspace.
1136  *    4. Upon return caller flushes TLB's if needed.
1137  *
1138  * Between 2 and 4, the guest may write to the page using the remaining TLB
1139  * entry.  This is not a problem because the page is reported dirty using
1140  * the snapshot taken before and step 4 ensures that writes done after
1141  * exiting to userspace will be logged for the next call.
1142  *
1143  */
1144 int kvm_get_dirty_log_protect(struct kvm *kvm,
1145                         struct kvm_dirty_log *log, bool *is_dirty)
1146 {
1147         struct kvm_memslots *slots;
1148         struct kvm_memory_slot *memslot;
1149         int r, i, as_id, id;
1150         unsigned long n;
1151         unsigned long *dirty_bitmap;
1152         unsigned long *dirty_bitmap_buffer;
1153 
1154         r = -EINVAL;
1155         as_id = log->slot >> 16;
1156         id = (u16)log->slot;
1157         if (as_id >= KVM_ADDRESS_SPACE_NUM || id >= KVM_USER_MEM_SLOTS)
1158                 goto out;
1159 
1160         slots = __kvm_memslots(kvm, as_id);
1161         memslot = id_to_memslot(slots, id);
1162 
1163         dirty_bitmap = memslot->dirty_bitmap;
1164         r = -ENOENT;
1165         if (!dirty_bitmap)
1166                 goto out;
1167 
1168         n = kvm_dirty_bitmap_bytes(memslot);
1169 
1170         dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
1171         memset(dirty_bitmap_buffer, 0, n);
1172 
1173         spin_lock(&kvm->mmu_lock);
1174         *is_dirty = false;
1175         for (i = 0; i < n / sizeof(long); i++) {
1176                 unsigned long mask;
1177                 gfn_t offset;
1178 
1179                 if (!dirty_bitmap[i])
1180                         continue;
1181 
1182                 *is_dirty = true;
1183 
1184                 mask = xchg(&dirty_bitmap[i], 0);
1185                 dirty_bitmap_buffer[i] = mask;
1186 
1187                 if (mask) {
1188                         offset = i * BITS_PER_LONG;
1189                         kvm_arch_mmu_enable_log_dirty_pt_masked(kvm, memslot,
1190                                                                 offset, mask);
1191                 }
1192         }
1193 
1194         spin_unlock(&kvm->mmu_lock);
1195 
1196         r = -EFAULT;
1197         if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
1198                 goto out;
1199 
1200         r = 0;
1201 out:
1202         return r;
1203 }
1204 EXPORT_SYMBOL_GPL(kvm_get_dirty_log_protect);
1205 #endif
1206 
1207 bool kvm_largepages_enabled(void)
1208 {
1209         return largepages_enabled;
1210 }
1211 
1212 void kvm_disable_largepages(void)
1213 {
1214         largepages_enabled = false;
1215 }
1216 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
1217 
1218 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1219 {
1220         return __gfn_to_memslot(kvm_memslots(kvm), gfn);
1221 }
1222 EXPORT_SYMBOL_GPL(gfn_to_memslot);
1223 
1224 struct kvm_memory_slot *kvm_vcpu_gfn_to_memslot(struct kvm_vcpu *vcpu, gfn_t gfn)
1225 {
1226         return __gfn_to_memslot(kvm_vcpu_memslots(vcpu), gfn);
1227 }
1228 
1229 bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1230 {
1231         struct kvm_memory_slot *memslot = gfn_to_memslot(kvm, gfn);
1232 
1233         if (!memslot || memslot->id >= KVM_USER_MEM_SLOTS ||
1234               memslot->flags & KVM_MEMSLOT_INVALID)
1235                 return false;
1236 
1237         return true;
1238 }
1239 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1240 
1241 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1242 {
1243         struct vm_area_struct *vma;
1244         unsigned long addr, size;
1245 
1246         size = PAGE_SIZE;
1247 
1248         addr = gfn_to_hva(kvm, gfn);
1249         if (kvm_is_error_hva(addr))
1250                 return PAGE_SIZE;
1251 
1252         down_read(&current->mm->mmap_sem);
1253         vma = find_vma(current->mm, addr);
1254         if (!vma)
1255                 goto out;
1256 
1257         size = vma_kernel_pagesize(vma);
1258 
1259 out:
1260         up_read(&current->mm->mmap_sem);
1261 
1262         return size;
1263 }
1264 
1265 static bool memslot_is_readonly(struct kvm_memory_slot *slot)
1266 {
1267         return slot->flags & KVM_MEM_READONLY;
1268 }
1269 
1270 static unsigned long __gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1271                                        gfn_t *nr_pages, bool write)
1272 {
1273         if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1274                 return KVM_HVA_ERR_BAD;
1275 
1276         if (memslot_is_readonly(slot) && write)
1277                 return KVM_HVA_ERR_RO_BAD;
1278 
1279         if (nr_pages)
1280                 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1281 
1282         return __gfn_to_hva_memslot(slot, gfn);
1283 }
1284 
1285 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1286                                      gfn_t *nr_pages)
1287 {
1288         return __gfn_to_hva_many(slot, gfn, nr_pages, true);
1289 }
1290 
1291 unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot,
1292                                         gfn_t gfn)
1293 {
1294         return gfn_to_hva_many(slot, gfn, NULL);
1295 }
1296 EXPORT_SYMBOL_GPL(gfn_to_hva_memslot);
1297 
1298 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1299 {
1300         return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1301 }
1302 EXPORT_SYMBOL_GPL(gfn_to_hva);
1303 
1304 unsigned long kvm_vcpu_gfn_to_hva(struct kvm_vcpu *vcpu, gfn_t gfn)
1305 {
1306         return gfn_to_hva_many(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn, NULL);
1307 }
1308 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_hva);
1309 
1310 /*
1311  * If writable is set to false, the hva returned by this function is only
1312  * allowed to be read.
1313  */
1314 unsigned long gfn_to_hva_memslot_prot(struct kvm_memory_slot *slot,
1315                                       gfn_t gfn, bool *writable)
1316 {
1317         unsigned long hva = __gfn_to_hva_many(slot, gfn, NULL, false);
1318 
1319         if (!kvm_is_error_hva(hva) && writable)
1320                 *writable = !memslot_is_readonly(slot);
1321 
1322         return hva;
1323 }
1324 
1325 unsigned long gfn_to_hva_prot(struct kvm *kvm, gfn_t gfn, bool *writable)
1326 {
1327         struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1328 
1329         return gfn_to_hva_memslot_prot(slot, gfn, writable);
1330 }
1331 
1332 unsigned long kvm_vcpu_gfn_to_hva_prot(struct kvm_vcpu *vcpu, gfn_t gfn, bool *writable)
1333 {
1334         struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1335 
1336         return gfn_to_hva_memslot_prot(slot, gfn, writable);
1337 }
1338 
1339 static int get_user_page_nowait(unsigned long start, int write,
1340                 struct page **page)
1341 {
1342         int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1343 
1344         if (write)
1345                 flags |= FOLL_WRITE;
1346 
1347         return __get_user_pages(current, current->mm, start, 1, flags, page,
1348                         NULL, NULL);
1349 }
1350 
1351 static inline int check_user_page_hwpoison(unsigned long addr)
1352 {
1353         int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1354 
1355         rc = __get_user_pages(current, current->mm, addr, 1,
1356                               flags, NULL, NULL, NULL);
1357         return rc == -EHWPOISON;
1358 }
1359 
1360 /*
1361  * The atomic path to get the writable pfn which will be stored in @pfn,
1362  * true indicates success, otherwise false is returned.
1363  */
1364 static bool hva_to_pfn_fast(unsigned long addr, bool atomic, bool *async,
1365                             bool write_fault, bool *writable, kvm_pfn_t *pfn)
1366 {
1367         struct page *page[1];
1368         int npages;
1369 
1370         if (!(async || atomic))
1371                 return false;
1372 
1373         /*
1374          * Fast pin a writable pfn only if it is a write fault request
1375          * or the caller allows to map a writable pfn for a read fault
1376          * request.
1377          */
1378         if (!(write_fault || writable))
1379                 return false;
1380 
1381         npages = __get_user_pages_fast(addr, 1, 1, page);
1382         if (npages == 1) {
1383                 *pfn = page_to_pfn(page[0]);
1384 
1385                 if (writable)
1386                         *writable = true;
1387                 return true;
1388         }
1389 
1390         return false;
1391 }
1392 
1393 /*
1394  * The slow path to get the pfn of the specified host virtual address,
1395  * 1 indicates success, -errno is returned if error is detected.
1396  */
1397 static int hva_to_pfn_slow(unsigned long addr, bool *async, bool write_fault,
1398                            bool *writable, kvm_pfn_t *pfn)
1399 {
1400         struct page *page[1];
1401         int npages = 0;
1402 
1403         might_sleep();
1404 
1405         if (writable)
1406                 *writable = write_fault;
1407 
1408         if (async) {
1409                 down_read(&current->mm->mmap_sem);
1410                 npages = get_user_page_nowait(addr, write_fault, page);
1411                 up_read(&current->mm->mmap_sem);
1412         } else
1413                 npages = __get_user_pages_unlocked(current, current->mm, addr, 1,
1414                                                    write_fault, 0, page,
1415                                                    FOLL_TOUCH|FOLL_HWPOISON);
1416         if (npages != 1)
1417                 return npages;
1418 
1419         /* map read fault as writable if possible */
1420         if (unlikely(!write_fault) && writable) {
1421                 struct page *wpage[1];
1422 
1423                 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1424                 if (npages == 1) {
1425                         *writable = true;
1426                         put_page(page[0]);
1427                         page[0] = wpage[0];
1428                 }
1429 
1430                 npages = 1;
1431         }
1432         *pfn = page_to_pfn(page[0]);
1433         return npages;
1434 }
1435 
1436 static bool vma_is_valid(struct vm_area_struct *vma, bool write_fault)
1437 {
1438         if (unlikely(!(vma->vm_flags & VM_READ)))
1439                 return false;
1440 
1441         if (write_fault && (unlikely(!(vma->vm_flags & VM_WRITE))))
1442                 return false;
1443 
1444         return true;
1445 }
1446 
1447 /*
1448  * Pin guest page in memory and return its pfn.
1449  * @addr: host virtual address which maps memory to the guest
1450  * @atomic: whether this function can sleep
1451  * @async: whether this function need to wait IO complete if the
1452  *         host page is not in the memory
1453  * @write_fault: whether we should get a writable host page
1454  * @writable: whether it allows to map a writable host page for !@write_fault
1455  *
1456  * The function will map a writable host page for these two cases:
1457  * 1): @write_fault = true
1458  * 2): @write_fault = false && @writable, @writable will tell the caller
1459  *     whether the mapping is writable.
1460  */
1461 static kvm_pfn_t hva_to_pfn(unsigned long addr, bool atomic, bool *async,
1462                         bool write_fault, bool *writable)
1463 {
1464         struct vm_area_struct *vma;
1465         kvm_pfn_t pfn = 0;
1466         int npages;
1467 
1468         /* we can do it either atomically or asynchronously, not both */
1469         BUG_ON(atomic && async);
1470 
1471         if (hva_to_pfn_fast(addr, atomic, async, write_fault, writable, &pfn))
1472                 return pfn;
1473 
1474         if (atomic)
1475                 return KVM_PFN_ERR_FAULT;
1476 
1477         npages = hva_to_pfn_slow(addr, async, write_fault, writable, &pfn);
1478         if (npages == 1)
1479                 return pfn;
1480 
1481         down_read(&current->mm->mmap_sem);
1482         if (npages == -EHWPOISON ||
1483               (!async && check_user_page_hwpoison(addr))) {
1484                 pfn = KVM_PFN_ERR_HWPOISON;
1485                 goto exit;
1486         }
1487 
1488         vma = find_vma_intersection(current->mm, addr, addr + 1);
1489 
1490         if (vma == NULL)
1491                 pfn = KVM_PFN_ERR_FAULT;
1492         else if ((vma->vm_flags & VM_PFNMAP)) {
1493                 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1494                         vma->vm_pgoff;
1495                 BUG_ON(!kvm_is_reserved_pfn(pfn));
1496         } else {
1497                 if (async && vma_is_valid(vma, write_fault))
1498                         *async = true;
1499                 pfn = KVM_PFN_ERR_FAULT;
1500         }
1501 exit:
1502         up_read(&current->mm->mmap_sem);
1503         return pfn;
1504 }
1505 
1506 kvm_pfn_t __gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn,
1507                                bool atomic, bool *async, bool write_fault,
1508                                bool *writable)
1509 {
1510         unsigned long addr = __gfn_to_hva_many(slot, gfn, NULL, write_fault);
1511 
1512         if (addr == KVM_HVA_ERR_RO_BAD) {
1513                 if (writable)
1514                         *writable = false;
1515                 return KVM_PFN_ERR_RO_FAULT;
1516         }
1517 
1518         if (kvm_is_error_hva(addr)) {
1519                 if (writable)
1520                         *writable = false;
1521                 return KVM_PFN_NOSLOT;
1522         }
1523 
1524         /* Do not map writable pfn in the readonly memslot. */
1525         if (writable && memslot_is_readonly(slot)) {
1526                 *writable = false;
1527                 writable = NULL;
1528         }
1529 
1530         return hva_to_pfn(addr, atomic, async, write_fault,
1531                           writable);
1532 }
1533 EXPORT_SYMBOL_GPL(__gfn_to_pfn_memslot);
1534 
1535 kvm_pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1536                       bool *writable)
1537 {
1538         return __gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn, false, NULL,
1539                                     write_fault, writable);
1540 }
1541 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1542 
1543 kvm_pfn_t gfn_to_pfn_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
1544 {
1545         return __gfn_to_pfn_memslot(slot, gfn, false, NULL, true, NULL);
1546 }
1547 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot);
1548 
1549 kvm_pfn_t gfn_to_pfn_memslot_atomic(struct kvm_memory_slot *slot, gfn_t gfn)
1550 {
1551         return __gfn_to_pfn_memslot(slot, gfn, true, NULL, true, NULL);
1552 }
1553 EXPORT_SYMBOL_GPL(gfn_to_pfn_memslot_atomic);
1554 
1555 kvm_pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1556 {
1557         return gfn_to_pfn_memslot_atomic(gfn_to_memslot(kvm, gfn), gfn);
1558 }
1559 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1560 
1561 kvm_pfn_t kvm_vcpu_gfn_to_pfn_atomic(struct kvm_vcpu *vcpu, gfn_t gfn)
1562 {
1563         return gfn_to_pfn_memslot_atomic(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1564 }
1565 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn_atomic);
1566 
1567 kvm_pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1568 {
1569         return gfn_to_pfn_memslot(gfn_to_memslot(kvm, gfn), gfn);
1570 }
1571 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1572 
1573 kvm_pfn_t kvm_vcpu_gfn_to_pfn(struct kvm_vcpu *vcpu, gfn_t gfn)
1574 {
1575         return gfn_to_pfn_memslot(kvm_vcpu_gfn_to_memslot(vcpu, gfn), gfn);
1576 }
1577 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_pfn);
1578 
1579 int gfn_to_page_many_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1580                             struct page **pages, int nr_pages)
1581 {
1582         unsigned long addr;
1583         gfn_t entry;
1584 
1585         addr = gfn_to_hva_many(slot, gfn, &entry);
1586         if (kvm_is_error_hva(addr))
1587                 return -1;
1588 
1589         if (entry < nr_pages)
1590                 return 0;
1591 
1592         return __get_user_pages_fast(addr, nr_pages, 1, pages);
1593 }
1594 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1595 
1596 static struct page *kvm_pfn_to_page(kvm_pfn_t pfn)
1597 {
1598         if (is_error_noslot_pfn(pfn))
1599                 return KVM_ERR_PTR_BAD_PAGE;
1600 
1601         if (kvm_is_reserved_pfn(pfn)) {
1602                 WARN_ON(1);
1603                 return KVM_ERR_PTR_BAD_PAGE;
1604         }
1605 
1606         return pfn_to_page(pfn);
1607 }
1608 
1609 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1610 {
1611         kvm_pfn_t pfn;
1612 
1613         pfn = gfn_to_pfn(kvm, gfn);
1614 
1615         return kvm_pfn_to_page(pfn);
1616 }
1617 EXPORT_SYMBOL_GPL(gfn_to_page);
1618 
1619 struct page *kvm_vcpu_gfn_to_page(struct kvm_vcpu *vcpu, gfn_t gfn)
1620 {
1621         kvm_pfn_t pfn;
1622 
1623         pfn = kvm_vcpu_gfn_to_pfn(vcpu, gfn);
1624 
1625         return kvm_pfn_to_page(pfn);
1626 }
1627 EXPORT_SYMBOL_GPL(kvm_vcpu_gfn_to_page);
1628 
1629 void kvm_release_page_clean(struct page *page)
1630 {
1631         WARN_ON(is_error_page(page));
1632 
1633         kvm_release_pfn_clean(page_to_pfn(page));
1634 }
1635 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1636 
1637 void kvm_release_pfn_clean(kvm_pfn_t pfn)
1638 {
1639         if (!is_error_noslot_pfn(pfn) && !kvm_is_reserved_pfn(pfn))
1640                 put_page(pfn_to_page(pfn));
1641 }
1642 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1643 
1644 void kvm_release_page_dirty(struct page *page)
1645 {
1646         WARN_ON(is_error_page(page));
1647 
1648         kvm_release_pfn_dirty(page_to_pfn(page));
1649 }
1650 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1651 
1652 static void kvm_release_pfn_dirty(kvm_pfn_t pfn)
1653 {
1654         kvm_set_pfn_dirty(pfn);
1655         kvm_release_pfn_clean(pfn);
1656 }
1657 
1658 void kvm_set_pfn_dirty(kvm_pfn_t pfn)
1659 {
1660         if (!kvm_is_reserved_pfn(pfn)) {
1661                 struct page *page = pfn_to_page(pfn);
1662 
1663                 if (!PageReserved(page))
1664                         SetPageDirty(page);
1665         }
1666 }
1667 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1668 
1669 void kvm_set_pfn_accessed(kvm_pfn_t pfn)
1670 {
1671         if (!kvm_is_reserved_pfn(pfn))
1672                 mark_page_accessed(pfn_to_page(pfn));
1673 }
1674 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1675 
1676 void kvm_get_pfn(kvm_pfn_t pfn)
1677 {
1678         if (!kvm_is_reserved_pfn(pfn))
1679                 get_page(pfn_to_page(pfn));
1680 }
1681 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1682 
1683 static int next_segment(unsigned long len, int offset)
1684 {
1685         if (len > PAGE_SIZE - offset)
1686                 return PAGE_SIZE - offset;
1687         else
1688                 return len;
1689 }
1690 
1691 static int __kvm_read_guest_page(struct kvm_memory_slot *slot, gfn_t gfn,
1692                                  void *data, int offset, int len)
1693 {
1694         int r;
1695         unsigned long addr;
1696 
1697         addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1698         if (kvm_is_error_hva(addr))
1699                 return -EFAULT;
1700         r = __copy_from_user(data, (void __user *)addr + offset, len);
1701         if (r)
1702                 return -EFAULT;
1703         return 0;
1704 }
1705 
1706 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1707                         int len)
1708 {
1709         struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1710 
1711         return __kvm_read_guest_page(slot, gfn, data, offset, len);
1712 }
1713 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1714 
1715 int kvm_vcpu_read_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn, void *data,
1716                              int offset, int len)
1717 {
1718         struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1719 
1720         return __kvm_read_guest_page(slot, gfn, data, offset, len);
1721 }
1722 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_page);
1723 
1724 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1725 {
1726         gfn_t gfn = gpa >> PAGE_SHIFT;
1727         int seg;
1728         int offset = offset_in_page(gpa);
1729         int ret;
1730 
1731         while ((seg = next_segment(len, offset)) != 0) {
1732                 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1733                 if (ret < 0)
1734                         return ret;
1735                 offset = 0;
1736                 len -= seg;
1737                 data += seg;
1738                 ++gfn;
1739         }
1740         return 0;
1741 }
1742 EXPORT_SYMBOL_GPL(kvm_read_guest);
1743 
1744 int kvm_vcpu_read_guest(struct kvm_vcpu *vcpu, gpa_t gpa, void *data, unsigned long len)
1745 {
1746         gfn_t gfn = gpa >> PAGE_SHIFT;
1747         int seg;
1748         int offset = offset_in_page(gpa);
1749         int ret;
1750 
1751         while ((seg = next_segment(len, offset)) != 0) {
1752                 ret = kvm_vcpu_read_guest_page(vcpu, gfn, data, offset, seg);
1753                 if (ret < 0)
1754                         return ret;
1755                 offset = 0;
1756                 len -= seg;
1757                 data += seg;
1758                 ++gfn;
1759         }
1760         return 0;
1761 }
1762 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest);
1763 
1764 static int __kvm_read_guest_atomic(struct kvm_memory_slot *slot, gfn_t gfn,
1765                                    void *data, int offset, unsigned long len)
1766 {
1767         int r;
1768         unsigned long addr;
1769 
1770         addr = gfn_to_hva_memslot_prot(slot, gfn, NULL);
1771         if (kvm_is_error_hva(addr))
1772                 return -EFAULT;
1773         pagefault_disable();
1774         r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1775         pagefault_enable();
1776         if (r)
1777                 return -EFAULT;
1778         return 0;
1779 }
1780 
1781 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1782                           unsigned long len)
1783 {
1784         gfn_t gfn = gpa >> PAGE_SHIFT;
1785         struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1786         int offset = offset_in_page(gpa);
1787 
1788         return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1789 }
1790 EXPORT_SYMBOL_GPL(kvm_read_guest_atomic);
1791 
1792 int kvm_vcpu_read_guest_atomic(struct kvm_vcpu *vcpu, gpa_t gpa,
1793                                void *data, unsigned long len)
1794 {
1795         gfn_t gfn = gpa >> PAGE_SHIFT;
1796         struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1797         int offset = offset_in_page(gpa);
1798 
1799         return __kvm_read_guest_atomic(slot, gfn, data, offset, len);
1800 }
1801 EXPORT_SYMBOL_GPL(kvm_vcpu_read_guest_atomic);
1802 
1803 static int __kvm_write_guest_page(struct kvm_memory_slot *memslot, gfn_t gfn,
1804                                   const void *data, int offset, int len)
1805 {
1806         int r;
1807         unsigned long addr;
1808 
1809         addr = gfn_to_hva_memslot(memslot, gfn);
1810         if (kvm_is_error_hva(addr))
1811                 return -EFAULT;
1812         r = __copy_to_user((void __user *)addr + offset, data, len);
1813         if (r)
1814                 return -EFAULT;
1815         mark_page_dirty_in_slot(memslot, gfn);
1816         return 0;
1817 }
1818 
1819 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn,
1820                          const void *data, int offset, int len)
1821 {
1822         struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
1823 
1824         return __kvm_write_guest_page(slot, gfn, data, offset, len);
1825 }
1826 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1827 
1828 int kvm_vcpu_write_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
1829                               const void *data, int offset, int len)
1830 {
1831         struct kvm_memory_slot *slot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
1832 
1833         return __kvm_write_guest_page(slot, gfn, data, offset, len);
1834 }
1835 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest_page);
1836 
1837 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1838                     unsigned long len)
1839 {
1840         gfn_t gfn = gpa >> PAGE_SHIFT;
1841         int seg;
1842         int offset = offset_in_page(gpa);
1843         int ret;
1844 
1845         while ((seg = next_segment(len, offset)) != 0) {
1846                 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1847                 if (ret < 0)
1848                         return ret;
1849                 offset = 0;
1850                 len -= seg;
1851                 data += seg;
1852                 ++gfn;
1853         }
1854         return 0;
1855 }
1856 EXPORT_SYMBOL_GPL(kvm_write_guest);
1857 
1858 int kvm_vcpu_write_guest(struct kvm_vcpu *vcpu, gpa_t gpa, const void *data,
1859                          unsigned long len)
1860 {
1861         gfn_t gfn = gpa >> PAGE_SHIFT;
1862         int seg;
1863         int offset = offset_in_page(gpa);
1864         int ret;
1865 
1866         while ((seg = next_segment(len, offset)) != 0) {
1867                 ret = kvm_vcpu_write_guest_page(vcpu, gfn, data, offset, seg);
1868                 if (ret < 0)
1869                         return ret;
1870                 offset = 0;
1871                 len -= seg;
1872                 data += seg;
1873                 ++gfn;
1874         }
1875         return 0;
1876 }
1877 EXPORT_SYMBOL_GPL(kvm_vcpu_write_guest);
1878 
1879 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1880                               gpa_t gpa, unsigned long len)
1881 {
1882         struct kvm_memslots *slots = kvm_memslots(kvm);
1883         int offset = offset_in_page(gpa);
1884         gfn_t start_gfn = gpa >> PAGE_SHIFT;
1885         gfn_t end_gfn = (gpa + len - 1) >> PAGE_SHIFT;
1886         gfn_t nr_pages_needed = end_gfn - start_gfn + 1;
1887         gfn_t nr_pages_avail;
1888 
1889         ghc->gpa = gpa;
1890         ghc->generation = slots->generation;
1891         ghc->len = len;
1892         ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1893         ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn, NULL);
1894         if (!kvm_is_error_hva(ghc->hva) && nr_pages_needed <= 1) {
1895                 ghc->hva += offset;
1896         } else {
1897                 /*
1898                  * If the requested region crosses two memslots, we still
1899                  * verify that the entire region is valid here.
1900                  */
1901                 while (start_gfn <= end_gfn) {
1902                         ghc->memslot = gfn_to_memslot(kvm, start_gfn);
1903                         ghc->hva = gfn_to_hva_many(ghc->memslot, start_gfn,
1904                                                    &nr_pages_avail);
1905                         if (kvm_is_error_hva(ghc->hva))
1906                                 return -EFAULT;
1907                         start_gfn += nr_pages_avail;
1908                 }
1909                 /* Use the slow path for cross page reads and writes. */
1910                 ghc->memslot = NULL;
1911         }
1912         return 0;
1913 }
1914 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1915 
1916 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1917                            void *data, unsigned long len)
1918 {
1919         struct kvm_memslots *slots = kvm_memslots(kvm);
1920         int r;
1921 
1922         BUG_ON(len > ghc->len);
1923 
1924         if (slots->generation != ghc->generation)
1925                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1926 
1927         if (unlikely(!ghc->memslot))
1928                 return kvm_write_guest(kvm, ghc->gpa, data, len);
1929 
1930         if (kvm_is_error_hva(ghc->hva))
1931                 return -EFAULT;
1932 
1933         r = __copy_to_user((void __user *)ghc->hva, data, len);
1934         if (r)
1935                 return -EFAULT;
1936         mark_page_dirty_in_slot(ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1937 
1938         return 0;
1939 }
1940 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1941 
1942 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1943                            void *data, unsigned long len)
1944 {
1945         struct kvm_memslots *slots = kvm_memslots(kvm);
1946         int r;
1947 
1948         BUG_ON(len > ghc->len);
1949 
1950         if (slots->generation != ghc->generation)
1951                 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa, ghc->len);
1952 
1953         if (unlikely(!ghc->memslot))
1954                 return kvm_read_guest(kvm, ghc->gpa, data, len);
1955 
1956         if (kvm_is_error_hva(ghc->hva))
1957                 return -EFAULT;
1958 
1959         r = __copy_from_user(data, (void __user *)ghc->hva, len);
1960         if (r)
1961                 return -EFAULT;
1962 
1963         return 0;
1964 }
1965 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1966 
1967 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1968 {
1969         const void *zero_page = (const void *) __va(page_to_phys(ZERO_PAGE(0)));
1970 
1971         return kvm_write_guest_page(kvm, gfn, zero_page, offset, len);
1972 }
1973 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1974 
1975 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1976 {
1977         gfn_t gfn = gpa >> PAGE_SHIFT;
1978         int seg;
1979         int offset = offset_in_page(gpa);
1980         int ret;
1981 
1982         while ((seg = next_segment(len, offset)) != 0) {
1983                 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1984                 if (ret < 0)
1985                         return ret;
1986                 offset = 0;
1987                 len -= seg;
1988                 ++gfn;
1989         }
1990         return 0;
1991 }
1992 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1993 
1994 static void mark_page_dirty_in_slot(struct kvm_memory_slot *memslot,
1995                                     gfn_t gfn)
1996 {
1997         if (memslot && memslot->dirty_bitmap) {
1998                 unsigned long rel_gfn = gfn - memslot->base_gfn;
1999 
2000                 set_bit_le(rel_gfn, memslot->dirty_bitmap);
2001         }
2002 }
2003 
2004 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
2005 {
2006         struct kvm_memory_slot *memslot;
2007 
2008         memslot = gfn_to_memslot(kvm, gfn);
2009         mark_page_dirty_in_slot(memslot, gfn);
2010 }
2011 EXPORT_SYMBOL_GPL(mark_page_dirty);
2012 
2013 void kvm_vcpu_mark_page_dirty(struct kvm_vcpu *vcpu, gfn_t gfn)
2014 {
2015         struct kvm_memory_slot *memslot;
2016 
2017         memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn);
2018         mark_page_dirty_in_slot(memslot, gfn);
2019 }
2020 EXPORT_SYMBOL_GPL(kvm_vcpu_mark_page_dirty);
2021 
2022 static void grow_halt_poll_ns(struct kvm_vcpu *vcpu)
2023 {
2024         unsigned int old, val, grow;
2025 
2026         old = val = vcpu->halt_poll_ns;
2027         grow = READ_ONCE(halt_poll_ns_grow);
2028         /* 10us base */
2029         if (val == 0 && grow)
2030                 val = 10000;
2031         else
2032                 val *= grow;
2033 
2034         if (val > halt_poll_ns)
2035                 val = halt_poll_ns;
2036 
2037         vcpu->halt_poll_ns = val;
2038         trace_kvm_halt_poll_ns_grow(vcpu->vcpu_id, val, old);
2039 }
2040 
2041 static void shrink_halt_poll_ns(struct kvm_vcpu *vcpu)
2042 {
2043         unsigned int old, val, shrink;
2044 
2045         old = val = vcpu->halt_poll_ns;
2046         shrink = READ_ONCE(halt_poll_ns_shrink);
2047         if (shrink == 0)
2048                 val = 0;
2049         else
2050                 val /= shrink;
2051 
2052         vcpu->halt_poll_ns = val;
2053         trace_kvm_halt_poll_ns_shrink(vcpu->vcpu_id, val, old);
2054 }
2055 
2056 static int kvm_vcpu_check_block(struct kvm_vcpu *vcpu)
2057 {
2058         if (kvm_arch_vcpu_runnable(vcpu)) {
2059                 kvm_make_request(KVM_REQ_UNHALT, vcpu);
2060                 return -EINTR;
2061         }
2062         if (kvm_cpu_has_pending_timer(vcpu))
2063                 return -EINTR;
2064         if (signal_pending(current))
2065                 return -EINTR;
2066 
2067         return 0;
2068 }
2069 
2070 /*
2071  * The vCPU has executed a HLT instruction with in-kernel mode enabled.
2072  */
2073 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
2074 {
2075         ktime_t start, cur;
2076         DECLARE_SWAITQUEUE(wait);
2077         bool waited = false;
2078         u64 block_ns;
2079 
2080         start = cur = ktime_get();
2081         if (vcpu->halt_poll_ns) {
2082                 ktime_t stop = ktime_add_ns(ktime_get(), vcpu->halt_poll_ns);
2083 
2084                 ++vcpu->stat.halt_attempted_poll;
2085                 do {
2086                         /*
2087                          * This sets KVM_REQ_UNHALT if an interrupt
2088                          * arrives.
2089                          */
2090                         if (kvm_vcpu_check_block(vcpu) < 0) {
2091                                 ++vcpu->stat.halt_successful_poll;
2092                                 if (!vcpu_valid_wakeup(vcpu))
2093                                         ++vcpu->stat.halt_poll_invalid;
2094                                 goto out;
2095                         }
2096                         cur = ktime_get();
2097                 } while (single_task_running() && ktime_before(cur, stop));
2098         }
2099 
2100         kvm_arch_vcpu_blocking(vcpu);
2101 
2102         for (;;) {
2103                 prepare_to_swait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
2104 
2105                 if (kvm_vcpu_check_block(vcpu) < 0)
2106                         break;
2107 
2108                 waited = true;
2109                 schedule();
2110         }
2111 
2112         finish_swait(&vcpu->wq, &wait);
2113         cur = ktime_get();
2114 
2115         kvm_arch_vcpu_unblocking(vcpu);
2116 out:
2117         block_ns = ktime_to_ns(cur) - ktime_to_ns(start);
2118 
2119         if (!vcpu_valid_wakeup(vcpu))
2120                 shrink_halt_poll_ns(vcpu);
2121         else if (halt_poll_ns) {
2122                 if (block_ns <= vcpu->halt_poll_ns)
2123                         ;
2124                 /* we had a long block, shrink polling */
2125                 else if (vcpu->halt_poll_ns && block_ns > halt_poll_ns)
2126                         shrink_halt_poll_ns(vcpu);
2127                 /* we had a short halt and our poll time is too small */
2128                 else if (vcpu->halt_poll_ns < halt_poll_ns &&
2129                         block_ns < halt_poll_ns)
2130                         grow_halt_poll_ns(vcpu);
2131         } else
2132                 vcpu->halt_poll_ns = 0;
2133 
2134         trace_kvm_vcpu_wakeup(block_ns, waited, vcpu_valid_wakeup(vcpu));
2135         kvm_arch_vcpu_block_finish(vcpu);
2136 }
2137 EXPORT_SYMBOL_GPL(kvm_vcpu_block);
2138 
2139 #ifndef CONFIG_S390
2140 void kvm_vcpu_wake_up(struct kvm_vcpu *vcpu)
2141 {
2142         struct swait_queue_head *wqp;
2143 
2144         wqp = kvm_arch_vcpu_wq(vcpu);
2145         if (swait_active(wqp)) {
2146                 swake_up(wqp);
2147                 ++vcpu->stat.halt_wakeup;
2148         }
2149 
2150 }
2151 EXPORT_SYMBOL_GPL(kvm_vcpu_wake_up);
2152 
2153 /*
2154  * Kick a sleeping VCPU, or a guest VCPU in guest mode, into host kernel mode.
2155  */
2156 void kvm_vcpu_kick(struct kvm_vcpu *vcpu)
2157 {
2158         int me;
2159         int cpu = vcpu->cpu;
2160 
2161         kvm_vcpu_wake_up(vcpu);
2162         me = get_cpu();
2163         if (cpu != me && (unsigned)cpu < nr_cpu_ids && cpu_online(cpu))
2164                 if (kvm_arch_vcpu_should_kick(vcpu))
2165                         smp_send_reschedule(cpu);
2166         put_cpu();
2167 }
2168 EXPORT_SYMBOL_GPL(kvm_vcpu_kick);
2169 #endif /* !CONFIG_S390 */
2170 
2171 int kvm_vcpu_yield_to(struct kvm_vcpu *target)
2172 {
2173         struct pid *pid;
2174         struct task_struct *task = NULL;
2175         int ret = 0;
2176 
2177         rcu_read_lock();
2178         pid = rcu_dereference(target->pid);
2179         if (pid)
2180                 task = get_pid_task(pid, PIDTYPE_PID);
2181         rcu_read_unlock();
2182         if (!task)
2183                 return ret;
2184         ret = yield_to(task, 1);
2185         put_task_struct(task);
2186 
2187         return ret;
2188 }
2189 EXPORT_SYMBOL_GPL(kvm_vcpu_yield_to);
2190 
2191 /*
2192  * Helper that checks whether a VCPU is eligible for directed yield.
2193  * Most eligible candidate to yield is decided by following heuristics:
2194  *
2195  *  (a) VCPU which has not done pl-exit or cpu relax intercepted recently
2196  *  (preempted lock holder), indicated by @in_spin_loop.
2197  *  Set at the beiginning and cleared at the end of interception/PLE handler.
2198  *
2199  *  (b) VCPU which has done pl-exit/ cpu relax intercepted but did not get
2200  *  chance last time (mostly it has become eligible now since we have probably
2201  *  yielded to lockholder in last iteration. This is done by toggling
2202  *  @dy_eligible each time a VCPU checked for eligibility.)
2203  *
2204  *  Yielding to a recently pl-exited/cpu relax intercepted VCPU before yielding
2205  *  to preempted lock-holder could result in wrong VCPU selection and CPU
2206  *  burning. Giving priority for a potential lock-holder increases lock
2207  *  progress.
2208  *
2209  *  Since algorithm is based on heuristics, accessing another VCPU data without
2210  *  locking does not harm. It may result in trying to yield to  same VCPU, fail
2211  *  and continue with next VCPU and so on.
2212  */
2213 static bool kvm_vcpu_eligible_for_directed_yield(struct kvm_vcpu *vcpu)
2214 {
2215 #ifdef CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT
2216         bool eligible;
2217 
2218         eligible = !vcpu->spin_loop.in_spin_loop ||
2219                     vcpu->spin_loop.dy_eligible;
2220 
2221         if (vcpu->spin_loop.in_spin_loop)
2222                 kvm_vcpu_set_dy_eligible(vcpu, !vcpu->spin_loop.dy_eligible);
2223 
2224         return eligible;
2225 #else
2226         return true;
2227 #endif
2228 }
2229 
2230 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
2231 {
2232         struct kvm *kvm = me->kvm;
2233         struct kvm_vcpu *vcpu;
2234         int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
2235         int yielded = 0;
2236         int try = 3;
2237         int pass;
2238         int i;
2239 
2240         kvm_vcpu_set_in_spin_loop(me, true);
2241         /*
2242          * We boost the priority of a VCPU that is runnable but not
2243          * currently running, because it got preempted by something
2244          * else and called schedule in __vcpu_run.  Hopefully that
2245          * VCPU is holding the lock that we need and will release it.
2246          * We approximate round-robin by starting at the last boosted VCPU.
2247          */
2248         for (pass = 0; pass < 2 && !yielded && try; pass++) {
2249                 kvm_for_each_vcpu(i, vcpu, kvm) {
2250                         if (!pass && i <= last_boosted_vcpu) {
2251                                 i = last_boosted_vcpu;
2252                                 continue;
2253                         } else if (pass && i > last_boosted_vcpu)
2254                                 break;
2255                         if (!ACCESS_ONCE(vcpu->preempted))
2256                                 continue;
2257                         if (vcpu == me)
2258                                 continue;
2259                         if (swait_active(&vcpu->wq) && !kvm_arch_vcpu_runnable(vcpu))
2260                                 continue;
2261                         if (!kvm_vcpu_eligible_for_directed_yield(vcpu))
2262                                 continue;
2263 
2264                         yielded = kvm_vcpu_yield_to(vcpu);
2265                         if (yielded > 0) {
2266                                 kvm->last_boosted_vcpu = i;
2267                                 break;
2268                         } else if (yielded < 0) {
2269                                 try--;
2270                                 if (!try)
2271                                         break;
2272                         }
2273                 }
2274         }
2275         kvm_vcpu_set_in_spin_loop(me, false);
2276 
2277         /* Ensure vcpu is not eligible during next spinloop */
2278         kvm_vcpu_set_dy_eligible(me, false);
2279 }
2280 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
2281 
2282 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2283 {
2284         struct kvm_vcpu *vcpu = vma->vm_file->private_data;
2285         struct page *page;
2286 
2287         if (vmf->pgoff == 0)
2288                 page = virt_to_page(vcpu->run);
2289 #ifdef CONFIG_X86
2290         else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
2291                 page = virt_to_page(vcpu->arch.pio_data);
2292 #endif
2293 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2294         else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
2295                 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
2296 #endif
2297         else
2298                 return kvm_arch_vcpu_fault(vcpu, vmf);
2299         get_page(page);
2300         vmf->page = page;
2301         return 0;
2302 }
2303 
2304 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
2305         .fault = kvm_vcpu_fault,
2306 };
2307 
2308 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
2309 {
2310         vma->vm_ops = &kvm_vcpu_vm_ops;
2311         return 0;
2312 }
2313 
2314 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
2315 {
2316         struct kvm_vcpu *vcpu = filp->private_data;
2317 
2318         kvm_put_kvm(vcpu->kvm);
2319         return 0;
2320 }
2321 
2322 static struct file_operations kvm_vcpu_fops = {
2323         .release        = kvm_vcpu_release,
2324         .unlocked_ioctl = kvm_vcpu_ioctl,
2325 #ifdef CONFIG_KVM_COMPAT
2326         .compat_ioctl   = kvm_vcpu_compat_ioctl,
2327 #endif
2328         .mmap           = kvm_vcpu_mmap,
2329         .llseek         = noop_llseek,
2330 };
2331 
2332 /*
2333  * Allocates an inode for the vcpu.
2334  */
2335 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
2336 {
2337         return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR | O_CLOEXEC);
2338 }
2339 
2340 /*
2341  * Creates some virtual cpus.  Good luck creating more than one.
2342  */
2343 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
2344 {
2345         int r;
2346         struct kvm_vcpu *vcpu;
2347 
2348         if (id >= KVM_MAX_VCPU_ID)
2349                 return -EINVAL;
2350 
2351         vcpu = kvm_arch_vcpu_create(kvm, id);
2352         if (IS_ERR(vcpu))
2353                 return PTR_ERR(vcpu);
2354 
2355         preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
2356 
2357         r = kvm_arch_vcpu_setup(vcpu);
2358         if (r)
2359                 goto vcpu_destroy;
2360 
2361         mutex_lock(&kvm->lock);
2362         if (!kvm_vcpu_compatible(vcpu)) {
2363                 r = -EINVAL;
2364                 goto unlock_vcpu_destroy;
2365         }
2366         if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
2367                 r = -EINVAL;
2368                 goto unlock_vcpu_destroy;
2369         }
2370         if (kvm_get_vcpu_by_id(kvm, id)) {
2371                 r = -EEXIST;
2372                 goto unlock_vcpu_destroy;
2373         }
2374 
2375         BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
2376 
2377         /* Now it's all set up, let userspace reach it */
2378         kvm_get_kvm(kvm);
2379         r = create_vcpu_fd(vcpu);
2380         if (r < 0) {
2381                 kvm_put_kvm(kvm);
2382                 goto unlock_vcpu_destroy;
2383         }
2384 
2385         kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
2386 
2387         /*
2388          * Pairs with smp_rmb() in kvm_get_vcpu.  Write kvm->vcpus
2389          * before kvm->online_vcpu's incremented value.
2390          */
2391         smp_wmb();
2392         atomic_inc(&kvm->online_vcpus);
2393 
2394         mutex_unlock(&kvm->lock);
2395         kvm_arch_vcpu_postcreate(vcpu);
2396         return r;
2397 
2398 unlock_vcpu_destroy:
2399         mutex_unlock(&kvm->lock);
2400 vcpu_destroy:
2401         kvm_arch_vcpu_destroy(vcpu);
2402         return r;
2403 }
2404 
2405 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
2406 {
2407         if (sigset) {
2408                 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
2409                 vcpu->sigset_active = 1;
2410                 vcpu->sigset = *sigset;
2411         } else
2412                 vcpu->sigset_active = 0;
2413         return 0;
2414 }
2415 
2416 static long kvm_vcpu_ioctl(struct file *filp,
2417                            unsigned int ioctl, unsigned long arg)
2418 {
2419         struct kvm_vcpu *vcpu = filp->private_data;
2420         void __user *argp = (void __user *)arg;
2421         int r;
2422         struct kvm_fpu *fpu = NULL;
2423         struct kvm_sregs *kvm_sregs = NULL;
2424 
2425         if (vcpu->kvm->mm != current->mm)
2426                 return -EIO;
2427 
2428         if (unlikely(_IOC_TYPE(ioctl) != KVMIO))
2429                 return -EINVAL;
2430 
2431 #if defined(CONFIG_S390) || defined(CONFIG_PPC) || defined(CONFIG_MIPS)
2432         /*
2433          * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
2434          * so vcpu_load() would break it.
2435          */
2436         if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_S390_IRQ || ioctl == KVM_INTERRUPT)
2437                 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2438 #endif
2439 
2440 
2441         r = vcpu_load(vcpu);
2442         if (r)
2443                 return r;
2444         switch (ioctl) {
2445         case KVM_RUN:
2446                 r = -EINVAL;
2447                 if (arg)
2448                         goto out;
2449                 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
2450                         /* The thread running this VCPU changed. */
2451                         struct pid *oldpid = vcpu->pid;
2452                         struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
2453 
2454                         rcu_assign_pointer(vcpu->pid, newpid);
2455                         if (oldpid)
2456                                 synchronize_rcu();
2457                         put_pid(oldpid);
2458                 }
2459                 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
2460                 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
2461                 break;
2462         case KVM_GET_REGS: {
2463                 struct kvm_regs *kvm_regs;
2464 
2465                 r = -ENOMEM;
2466                 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
2467                 if (!kvm_regs)
2468                         goto out;
2469                 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
2470                 if (r)
2471                         goto out_free1;
2472                 r = -EFAULT;
2473                 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
2474                         goto out_free1;
2475                 r = 0;
2476 out_free1:
2477                 kfree(kvm_regs);
2478                 break;
2479         }
2480         case KVM_SET_REGS: {
2481                 struct kvm_regs *kvm_regs;
2482 
2483                 r = -ENOMEM;
2484                 kvm_regs = memdup_user(argp, sizeof(*kvm_regs));
2485                 if (IS_ERR(kvm_regs)) {
2486                         r = PTR_ERR(kvm_regs);
2487                         goto out;
2488                 }
2489                 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
2490                 kfree(kvm_regs);
2491                 break;
2492         }
2493         case KVM_GET_SREGS: {
2494                 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
2495                 r = -ENOMEM;
2496                 if (!kvm_sregs)
2497                         goto out;
2498                 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
2499                 if (r)
2500                         goto out;
2501                 r = -EFAULT;
2502                 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
2503                         goto out;
2504                 r = 0;
2505                 break;
2506         }
2507         case KVM_SET_SREGS: {
2508                 kvm_sregs = memdup_user(argp, sizeof(*kvm_sregs));
2509                 if (IS_ERR(kvm_sregs)) {
2510                         r = PTR_ERR(kvm_sregs);
2511                         kvm_sregs = NULL;
2512                         goto out;
2513                 }
2514                 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
2515                 break;
2516         }
2517         case KVM_GET_MP_STATE: {
2518                 struct kvm_mp_state mp_state;
2519 
2520                 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
2521                 if (r)
2522                         goto out;
2523                 r = -EFAULT;
2524                 if (copy_to_user(argp, &mp_state, sizeof(mp_state)))
2525                         goto out;
2526                 r = 0;
2527                 break;
2528         }
2529         case KVM_SET_MP_STATE: {
2530                 struct kvm_mp_state mp_state;
2531 
2532                 r = -EFAULT;
2533                 if (copy_from_user(&mp_state, argp, sizeof(mp_state)))
2534                         goto out;
2535                 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
2536                 break;
2537         }
2538         case KVM_TRANSLATE: {
2539                 struct kvm_translation tr;
2540 
2541                 r = -EFAULT;
2542                 if (copy_from_user(&tr, argp, sizeof(tr)))
2543                         goto out;
2544                 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
2545                 if (r)
2546                         goto out;
2547                 r = -EFAULT;
2548                 if (copy_to_user(argp, &tr, sizeof(tr)))
2549                         goto out;
2550                 r = 0;
2551                 break;
2552         }
2553         case KVM_SET_GUEST_DEBUG: {
2554                 struct kvm_guest_debug dbg;
2555 
2556                 r = -EFAULT;
2557                 if (copy_from_user(&dbg, argp, sizeof(dbg)))
2558                         goto out;
2559                 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
2560                 break;
2561         }
2562         case KVM_SET_SIGNAL_MASK: {
2563                 struct kvm_signal_mask __user *sigmask_arg = argp;
2564                 struct kvm_signal_mask kvm_sigmask;
2565                 sigset_t sigset, *p;
2566 
2567                 p = NULL;
2568                 if (argp) {
2569                         r = -EFAULT;
2570                         if (copy_from_user(&kvm_sigmask, argp,
2571                                            sizeof(kvm_sigmask)))
2572                                 goto out;
2573                         r = -EINVAL;
2574                         if (kvm_sigmask.len != sizeof(sigset))
2575                                 goto out;
2576                         r = -EFAULT;
2577                         if (copy_from_user(&sigset, sigmask_arg->sigset,
2578                                            sizeof(sigset)))
2579                                 goto out;
2580                         p = &sigset;
2581                 }
2582                 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
2583                 break;
2584         }
2585         case KVM_GET_FPU: {
2586                 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
2587                 r = -ENOMEM;
2588                 if (!fpu)
2589                         goto out;
2590                 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
2591                 if (r)
2592                         goto out;
2593                 r = -EFAULT;
2594                 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
2595                         goto out;
2596                 r = 0;
2597                 break;
2598         }
2599         case KVM_SET_FPU: {
2600                 fpu = memdup_user(argp, sizeof(*fpu));
2601                 if (IS_ERR(fpu)) {
2602                         r = PTR_ERR(fpu);
2603                         fpu = NULL;
2604                         goto out;
2605                 }
2606                 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
2607                 break;
2608         }
2609         default:
2610                 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
2611         }
2612 out:
2613         vcpu_put(vcpu);
2614         kfree(fpu);
2615         kfree(kvm_sregs);
2616         return r;
2617 }
2618 
2619 #ifdef CONFIG_KVM_COMPAT
2620 static long kvm_vcpu_compat_ioctl(struct file *filp,
2621                                   unsigned int ioctl, unsigned long arg)
2622 {
2623         struct kvm_vcpu *vcpu = filp->private_data;
2624         void __user *argp = compat_ptr(arg);
2625         int r;
2626 
2627         if (vcpu->kvm->mm != current->mm)
2628                 return -EIO;
2629 
2630         switch (ioctl) {
2631         case KVM_SET_SIGNAL_MASK: {
2632                 struct kvm_signal_mask __user *sigmask_arg = argp;
2633                 struct kvm_signal_mask kvm_sigmask;
2634                 compat_sigset_t csigset;
2635                 sigset_t sigset;
2636 
2637                 if (argp) {
2638                         r = -EFAULT;
2639                         if (copy_from_user(&kvm_sigmask, argp,
2640                                            sizeof(kvm_sigmask)))
2641                                 goto out;
2642                         r = -EINVAL;
2643                         if (kvm_sigmask.len != sizeof(csigset))
2644                                 goto out;
2645                         r = -EFAULT;
2646                         if (copy_from_user(&csigset, sigmask_arg->sigset,
2647                                            sizeof(csigset)))
2648                                 goto out;
2649                         sigset_from_compat(&sigset, &csigset);
2650                         r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
2651                 } else
2652                         r = kvm_vcpu_ioctl_set_sigmask(vcpu, NULL);
2653                 break;
2654         }
2655         default:
2656                 r = kvm_vcpu_ioctl(filp, ioctl, arg);
2657         }
2658 
2659 out:
2660         return r;
2661 }
2662 #endif
2663 
2664 static int kvm_device_ioctl_attr(struct kvm_device *dev,
2665                                  int (*accessor)(struct kvm_device *dev,
2666                                                  struct kvm_device_attr *attr),
2667                                  unsigned long arg)
2668 {
2669         struct kvm_device_attr attr;
2670 
2671         if (!accessor)
2672                 return -EPERM;
2673 
2674         if (copy_from_user(&attr, (void __user *)arg, sizeof(attr)))
2675                 return -EFAULT;
2676 
2677         return accessor(dev, &attr);
2678 }
2679 
2680 static long kvm_device_ioctl(struct file *filp, unsigned int ioctl,
2681                              unsigned long arg)
2682 {
2683         struct kvm_device *dev = filp->private_data;
2684 
2685         switch (ioctl) {
2686         case KVM_SET_DEVICE_ATTR:
2687                 return kvm_device_ioctl_attr(dev, dev->ops->set_attr, arg);
2688         case KVM_GET_DEVICE_ATTR:
2689                 return kvm_device_ioctl_attr(dev, dev->ops->get_attr, arg);
2690         case KVM_HAS_DEVICE_ATTR:
2691                 return kvm_device_ioctl_attr(dev, dev->ops->has_attr, arg);
2692         default:
2693                 if (dev->ops->ioctl)
2694                         return dev->ops->ioctl(dev, ioctl, arg);
2695 
2696                 return -ENOTTY;
2697         }
2698 }
2699 
2700 static int kvm_device_release(struct inode *inode, struct file *filp)
2701 {
2702         struct kvm_device *dev = filp->private_data;
2703         struct kvm *kvm = dev->kvm;
2704 
2705         kvm_put_kvm(kvm);
2706         return 0;
2707 }
2708 
2709 static const struct file_operations kvm_device_fops = {
2710         .unlocked_ioctl = kvm_device_ioctl,
2711 #ifdef CONFIG_KVM_COMPAT
2712         .compat_ioctl = kvm_device_ioctl,
2713 #endif
2714         .release = kvm_device_release,
2715 };
2716 
2717 struct kvm_device *kvm_device_from_filp(struct file *filp)
2718 {
2719         if (filp->f_op != &kvm_device_fops)
2720                 return NULL;
2721 
2722         return filp->private_data;
2723 }
2724 
2725 static struct kvm_device_ops *kvm_device_ops_table[KVM_DEV_TYPE_MAX] = {
2726 #ifdef CONFIG_KVM_MPIC
2727         [KVM_DEV_TYPE_FSL_MPIC_20]      = &kvm_mpic_ops,
2728         [KVM_DEV_TYPE_FSL_MPIC_42]      = &kvm_mpic_ops,
2729 #endif
2730 
2731 #ifdef CONFIG_KVM_XICS
2732         [KVM_DEV_TYPE_XICS]             = &kvm_xics_ops,
2733 #endif
2734 };
2735 
2736 int kvm_register_device_ops(struct kvm_device_ops *ops, u32 type)
2737 {
2738         if (type >= ARRAY_SIZE(kvm_device_ops_table))
2739                 return -ENOSPC;
2740 
2741         if (kvm_device_ops_table[type] != NULL)
2742                 return -EEXIST;
2743 
2744         kvm_device_ops_table[type] = ops;
2745         return 0;
2746 }
2747 
2748 void kvm_unregister_device_ops(u32 type)
2749 {
2750         if (kvm_device_ops_table[type] != NULL)
2751                 kvm_device_ops_table[type] = NULL;
2752 }
2753 
2754 static int kvm_ioctl_create_device(struct kvm *kvm,
2755                                    struct kvm_create_device *cd)
2756 {
2757         struct kvm_device_ops *ops = NULL;
2758         struct kvm_device *dev;
2759         bool test = cd->flags & KVM_CREATE_DEVICE_TEST;
2760         int ret;
2761 
2762         if (cd->type >= ARRAY_SIZE(kvm_device_ops_table))
2763                 return -ENODEV;
2764 
2765         ops = kvm_device_ops_table[cd->type];
2766         if (ops == NULL)
2767                 return -ENODEV;
2768 
2769         if (test)
2770                 return 0;
2771 
2772         dev = kzalloc(sizeof(*dev), GFP_KERNEL);
2773         if (!dev)
2774                 return -ENOMEM;
2775 
2776         dev->ops = ops;
2777         dev->kvm = kvm;
2778 
2779         ret = ops->create(dev, cd->type);
2780         if (ret < 0) {
2781                 kfree(dev);
2782                 return ret;
2783         }
2784 
2785         ret = anon_inode_getfd(ops->name, &kvm_device_fops, dev, O_RDWR | O_CLOEXEC);
2786         if (ret < 0) {
2787                 ops->destroy(dev);
2788                 return ret;
2789         }
2790 
2791         list_add(&dev->vm_node, &kvm->devices);
2792         kvm_get_kvm(kvm);
2793         cd->fd = ret;
2794         return 0;
2795 }
2796 
2797 static long kvm_vm_ioctl_check_extension_generic(struct kvm *kvm, long arg)
2798 {
2799         switch (arg) {
2800         case KVM_CAP_USER_MEMORY:
2801         case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2802         case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2803         case KVM_CAP_INTERNAL_ERROR_DATA:
2804 #ifdef CONFIG_HAVE_KVM_MSI
2805         case KVM_CAP_SIGNAL_MSI:
2806 #endif
2807 #ifdef CONFIG_HAVE_KVM_IRQFD
2808         case KVM_CAP_IRQFD:
2809         case KVM_CAP_IRQFD_RESAMPLE:
2810 #endif
2811         case KVM_CAP_IOEVENTFD_ANY_LENGTH:
2812         case KVM_CAP_CHECK_EXTENSION_VM:
2813                 return 1;
2814 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2815         case KVM_CAP_IRQ_ROUTING:
2816                 return KVM_MAX_IRQ_ROUTES;
2817 #endif
2818 #if KVM_ADDRESS_SPACE_NUM > 1
2819         case KVM_CAP_MULTI_ADDRESS_SPACE:
2820                 return KVM_ADDRESS_SPACE_NUM;
2821 #endif
2822         case KVM_CAP_MAX_VCPU_ID:
2823                 return KVM_MAX_VCPU_ID;
2824         default:
2825                 break;
2826         }
2827         return kvm_vm_ioctl_check_extension(kvm, arg);
2828 }
2829 
2830 static long kvm_vm_ioctl(struct file *filp,
2831                            unsigned int ioctl, unsigned long arg)
2832 {
2833         struct kvm *kvm = filp->private_data;
2834         void __user *argp = (void __user *)arg;
2835         int r;
2836 
2837         if (kvm->mm != current->mm)
2838                 return -EIO;
2839         switch (ioctl) {
2840         case KVM_CREATE_VCPU:
2841                 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
2842                 break;
2843         case KVM_SET_USER_MEMORY_REGION: {
2844                 struct kvm_userspace_memory_region kvm_userspace_mem;
2845 
2846                 r = -EFAULT;
2847                 if (copy_from_user(&kvm_userspace_mem, argp,
2848                                                 sizeof(kvm_userspace_mem)))
2849                         goto out;
2850 
2851                 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem);
2852                 break;
2853         }
2854         case KVM_GET_DIRTY_LOG: {
2855                 struct kvm_dirty_log log;
2856 
2857                 r = -EFAULT;
2858                 if (copy_from_user(&log, argp, sizeof(log)))
2859                         goto out;
2860                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2861                 break;
2862         }
2863 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2864         case KVM_REGISTER_COALESCED_MMIO: {
2865                 struct kvm_coalesced_mmio_zone zone;
2866 
2867                 r = -EFAULT;
2868                 if (copy_from_user(&zone, argp, sizeof(zone)))
2869                         goto out;
2870                 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2871                 break;
2872         }
2873         case KVM_UNREGISTER_COALESCED_MMIO: {
2874                 struct kvm_coalesced_mmio_zone zone;
2875 
2876                 r = -EFAULT;
2877                 if (copy_from_user(&zone, argp, sizeof(zone)))
2878                         goto out;
2879                 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2880                 break;
2881         }
2882 #endif
2883         case KVM_IRQFD: {
2884                 struct kvm_irqfd data;
2885 
2886                 r = -EFAULT;
2887                 if (copy_from_user(&data, argp, sizeof(data)))
2888                         goto out;
2889                 r = kvm_irqfd(kvm, &data);
2890                 break;
2891         }
2892         case KVM_IOEVENTFD: {
2893                 struct kvm_ioeventfd data;
2894 
2895                 r = -EFAULT;
2896                 if (copy_from_user(&data, argp, sizeof(data)))
2897                         goto out;
2898                 r = kvm_ioeventfd(kvm, &data);
2899                 break;
2900         }
2901 #ifdef CONFIG_HAVE_KVM_MSI
2902         case KVM_SIGNAL_MSI: {
2903                 struct kvm_msi msi;
2904 
2905                 r = -EFAULT;
2906                 if (copy_from_user(&msi, argp, sizeof(msi)))
2907                         goto out;
2908                 r = kvm_send_userspace_msi(kvm, &msi);
2909                 break;
2910         }
2911 #endif
2912 #ifdef __KVM_HAVE_IRQ_LINE
2913         case KVM_IRQ_LINE_STATUS:
2914         case KVM_IRQ_LINE: {
2915                 struct kvm_irq_level irq_event;
2916 
2917                 r = -EFAULT;
2918                 if (copy_from_user(&irq_event, argp, sizeof(irq_event)))
2919                         goto out;
2920 
2921                 r = kvm_vm_ioctl_irq_line(kvm, &irq_event,
2922                                         ioctl == KVM_IRQ_LINE_STATUS);
2923                 if (r)
2924                         goto out;
2925 
2926                 r = -EFAULT;
2927                 if (ioctl == KVM_IRQ_LINE_STATUS) {
2928                         if (copy_to_user(argp, &irq_event, sizeof(irq_event)))
2929                                 goto out;
2930                 }
2931 
2932                 r = 0;
2933                 break;
2934         }
2935 #endif
2936 #ifdef CONFIG_HAVE_KVM_IRQ_ROUTING
2937         case KVM_SET_GSI_ROUTING: {
2938                 struct kvm_irq_routing routing;
2939                 struct kvm_irq_routing __user *urouting;
2940                 struct kvm_irq_routing_entry *entries = NULL;
2941 
2942                 r = -EFAULT;
2943                 if (copy_from_user(&routing, argp, sizeof(routing)))
2944                         goto out;
2945                 r = -EINVAL;
2946                 if (routing.nr > KVM_MAX_IRQ_ROUTES)
2947                         goto out;
2948                 if (routing.flags)
2949                         goto out;
2950                 if (routing.nr) {
2951                         r = -ENOMEM;
2952                         entries = vmalloc(routing.nr * sizeof(*entries));
2953                         if (!entries)
2954                                 goto out;
2955                         r = -EFAULT;
2956                         urouting = argp;
2957                         if (copy_from_user(entries, urouting->entries,
2958                                            routing.nr * sizeof(*entries)))
2959                                 goto out_free_irq_routing;
2960                 }
2961                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
2962                                         routing.flags);
2963 out_free_irq_routing:
2964                 vfree(entries);
2965                 break;
2966         }
2967 #endif /* CONFIG_HAVE_KVM_IRQ_ROUTING */
2968         case KVM_CREATE_DEVICE: {
2969                 struct kvm_create_device cd;
2970 
2971                 r = -EFAULT;
2972                 if (copy_from_user(&cd, argp, sizeof(cd)))
2973                         goto out;
2974 
2975                 r = kvm_ioctl_create_device(kvm, &cd);
2976                 if (r)
2977                         goto out;
2978 
2979                 r = -EFAULT;
2980                 if (copy_to_user(argp, &cd, sizeof(cd)))
2981                         goto out;
2982 
2983                 r = 0;
2984                 break;
2985         }
2986         case KVM_CHECK_EXTENSION:
2987                 r = kvm_vm_ioctl_check_extension_generic(kvm, arg);
2988                 break;
2989         default:
2990                 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2991         }
2992 out:
2993         return r;
2994 }
2995 
2996 #ifdef CONFIG_KVM_COMPAT
2997 struct compat_kvm_dirty_log {
2998         __u32 slot;
2999         __u32 padding1;
3000         union {
3001                 compat_uptr_t dirty_bitmap; /* one bit per page */
3002                 __u64 padding2;
3003         };
3004 };
3005 
3006 static long kvm_vm_compat_ioctl(struct file *filp,
3007                            unsigned int ioctl, unsigned long arg)
3008 {
3009         struct kvm *kvm = filp->private_data;
3010         int r;
3011 
3012         if (kvm->mm != current->mm)
3013                 return -EIO;
3014         switch (ioctl) {
3015         case KVM_GET_DIRTY_LOG: {
3016                 struct compat_kvm_dirty_log compat_log;
3017                 struct kvm_dirty_log log;
3018 
3019                 r = -EFAULT;
3020                 if (copy_from_user(&compat_log, (void __user *)arg,
3021                                    sizeof(compat_log)))
3022                         goto out;
3023                 log.slot         = compat_log.slot;
3024                 log.padding1     = compat_log.padding1;
3025                 log.padding2     = compat_log.padding2;
3026                 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
3027 
3028                 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
3029                 break;
3030         }
3031         default:
3032                 r = kvm_vm_ioctl(filp, ioctl, arg);
3033         }
3034 
3035 out:
3036         return r;
3037 }
3038 #endif
3039 
3040 static struct file_operations kvm_vm_fops = {
3041         .release        = kvm_vm_release,
3042         .unlocked_ioctl = kvm_vm_ioctl,
3043 #ifdef CONFIG_KVM_COMPAT
3044         .compat_ioctl   = kvm_vm_compat_ioctl,
3045 #endif
3046         .llseek         = noop_llseek,
3047 };
3048 
3049 static int kvm_dev_ioctl_create_vm(unsigned long type)
3050 {
3051         int r;
3052         struct kvm *kvm;
3053 
3054         kvm = kvm_create_vm(type);
3055         if (IS_ERR(kvm))
3056                 return PTR_ERR(kvm);
3057 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3058         r = kvm_coalesced_mmio_init(kvm);
3059         if (r < 0) {
3060                 kvm_put_kvm(kvm);
3061                 return r;
3062         }
3063 #endif
3064         r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR | O_CLOEXEC);
3065         if (r < 0) {
3066                 kvm_put_kvm(kvm);
3067                 return r;
3068         }
3069 
3070         if (kvm_create_vm_debugfs(kvm, r) < 0) {
3071                 kvm_put_kvm(kvm);
3072                 return -ENOMEM;
3073         }
3074 
3075         return r;
3076 }
3077 
3078 static long kvm_dev_ioctl(struct file *filp,
3079                           unsigned int ioctl, unsigned long arg)
3080 {
3081         long r = -EINVAL;
3082 
3083         switch (ioctl) {
3084         case KVM_GET_API_VERSION:
3085                 if (arg)
3086                         goto out;
3087                 r = KVM_API_VERSION;
3088                 break;
3089         case KVM_CREATE_VM:
3090                 r = kvm_dev_ioctl_create_vm(arg);
3091                 break;
3092         case KVM_CHECK_EXTENSION:
3093                 r = kvm_vm_ioctl_check_extension_generic(NULL, arg);
3094                 break;
3095         case KVM_GET_VCPU_MMAP_SIZE:
3096                 if (arg)
3097                         goto out;
3098                 r = PAGE_SIZE;     /* struct kvm_run */
3099 #ifdef CONFIG_X86
3100                 r += PAGE_SIZE;    /* pio data page */
3101 #endif
3102 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
3103                 r += PAGE_SIZE;    /* coalesced mmio ring page */
3104 #endif
3105                 break;
3106         case KVM_TRACE_ENABLE:
3107         case KVM_TRACE_PAUSE:
3108         case KVM_TRACE_DISABLE:
3109                 r = -EOPNOTSUPP;
3110                 break;
3111         default:
3112                 return kvm_arch_dev_ioctl(filp, ioctl, arg);
3113         }
3114 out:
3115         return r;
3116 }
3117 
3118 static struct file_operations kvm_chardev_ops = {
3119         .unlocked_ioctl = kvm_dev_ioctl,
3120         .compat_ioctl   = kvm_dev_ioctl,
3121         .llseek         = noop_llseek,
3122 };
3123 
3124 static struct miscdevice kvm_dev = {
3125         KVM_MINOR,
3126         "kvm",
3127         &kvm_chardev_ops,
3128 };
3129 
3130 static void hardware_enable_nolock(void *junk)
3131 {
3132         int cpu = raw_smp_processor_id();
3133         int r;
3134 
3135         if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
3136                 return;
3137 
3138         cpumask_set_cpu(cpu, cpus_hardware_enabled);
3139 
3140         r = kvm_arch_hardware_enable();
3141 
3142         if (r) {
3143                 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3144                 atomic_inc(&hardware_enable_failed);
3145                 pr_info("kvm: enabling virtualization on CPU%d failed\n", cpu);
3146         }
3147 }
3148 
3149 static void hardware_enable(void)
3150 {
3151         raw_spin_lock(&kvm_count_lock);
3152         if (kvm_usage_count)
3153                 hardware_enable_nolock(NULL);
3154         raw_spin_unlock(&kvm_count_lock);
3155 }
3156 
3157 static void hardware_disable_nolock(void *junk)
3158 {
3159         int cpu = raw_smp_processor_id();
3160 
3161         if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
3162                 return;
3163         cpumask_clear_cpu(cpu, cpus_hardware_enabled);
3164         kvm_arch_hardware_disable();
3165 }
3166 
3167 static void hardware_disable(void)
3168 {
3169         raw_spin_lock(&kvm_count_lock);
3170         if (kvm_usage_count)
3171                 hardware_disable_nolock(NULL);
3172         raw_spin_unlock(&kvm_count_lock);
3173 }
3174 
3175 static void hardware_disable_all_nolock(void)
3176 {
3177         BUG_ON(!kvm_usage_count);
3178 
3179         kvm_usage_count--;
3180         if (!kvm_usage_count)
3181                 on_each_cpu(hardware_disable_nolock, NULL, 1);
3182 }
3183 
3184 static void hardware_disable_all(void)
3185 {
3186         raw_spin_lock(&kvm_count_lock);
3187         hardware_disable_all_nolock();
3188         raw_spin_unlock(&kvm_count_lock);
3189 }
3190 
3191 static int hardware_enable_all(void)
3192 {
3193         int r = 0;
3194 
3195         raw_spin_lock(&kvm_count_lock);
3196 
3197         kvm_usage_count++;
3198         if (kvm_usage_count == 1) {
3199                 atomic_set(&hardware_enable_failed, 0);
3200                 on_each_cpu(hardware_enable_nolock, NULL, 1);
3201 
3202                 if (atomic_read(&hardware_enable_failed)) {
3203                         hardware_disable_all_nolock();
3204                         r = -EBUSY;
3205                 }
3206         }
3207 
3208         raw_spin_unlock(&kvm_count_lock);
3209 
3210         return r;
3211 }
3212 
3213 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
3214                            void *v)
3215 {
3216         val &= ~CPU_TASKS_FROZEN;
3217         switch (val) {
3218         case CPU_DYING:
3219                 hardware_disable();
3220                 break;
3221         case CPU_STARTING:
3222                 hardware_enable();
3223                 break;
3224         }
3225         return NOTIFY_OK;
3226 }
3227 
3228 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
3229                       void *v)
3230 {
3231         /*
3232          * Some (well, at least mine) BIOSes hang on reboot if
3233          * in vmx root mode.
3234          *
3235          * And Intel TXT required VMX off for all cpu when system shutdown.
3236          */
3237         pr_info("kvm: exiting hardware virtualization\n");
3238         kvm_rebooting = true;
3239         on_each_cpu(hardware_disable_nolock, NULL, 1);
3240         return NOTIFY_OK;
3241 }
3242 
3243 static struct notifier_block kvm_reboot_notifier = {
3244         .notifier_call = kvm_reboot,
3245         .priority = 0,
3246 };
3247 
3248 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
3249 {
3250         int i;
3251 
3252         for (i = 0; i < bus->dev_count; i++) {
3253                 struct kvm_io_device *pos = bus->range[i].dev;
3254 
3255                 kvm_iodevice_destructor(pos);
3256         }
3257         kfree(bus);
3258 }
3259 
3260 static inline int kvm_io_bus_cmp(const struct kvm_io_range *r1,
3261                                  const struct kvm_io_range *r2)
3262 {
3263         gpa_t addr1 = r1->addr;
3264         gpa_t addr2 = r2->addr;
3265 
3266         if (addr1 < addr2)
3267                 return -1;
3268 
3269         /* If r2->len == 0, match the exact address.  If r2->len != 0,
3270          * accept any overlapping write.  Any order is acceptable for
3271          * overlapping ranges, because kvm_io_bus_get_first_dev ensures
3272          * we process all of them.
3273          */
3274         if (r2->len) {
3275                 addr1 += r1->len;
3276                 addr2 += r2->len;
3277         }
3278 
3279         if (addr1 > addr2)
3280                 return 1;
3281 
3282         return 0;
3283 }
3284 
3285 static int kvm_io_bus_sort_cmp(const void *p1, const void *p2)
3286 {
3287         return kvm_io_bus_cmp(p1, p2);
3288 }
3289 
3290 static int kvm_io_bus_insert_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev,
3291                           gpa_t addr, int len)
3292 {
3293         bus->range[bus->dev_count++] = (struct kvm_io_range) {
3294                 .addr = addr,
3295                 .len = len,
3296                 .dev = dev,
3297         };
3298 
3299         sort(bus->range, bus->dev_count, sizeof(struct kvm_io_range),
3300                 kvm_io_bus_sort_cmp, NULL);
3301 
3302         return 0;
3303 }
3304 
3305 static int kvm_io_bus_get_first_dev(struct kvm_io_bus *bus,
3306                              gpa_t addr, int len)
3307 {
3308         struct kvm_io_range *range, key;
3309         int off;
3310 
3311         key = (struct kvm_io_range) {
3312                 .addr = addr,
3313                 .len = len,
3314         };
3315 
3316         range = bsearch(&key, bus->range, bus->dev_count,
3317                         sizeof(struct kvm_io_range), kvm_io_bus_sort_cmp);
3318         if (range == NULL)
3319                 return -ENOENT;
3320 
3321         off = range - bus->range;
3322 
3323         while (off > 0 && kvm_io_bus_cmp(&key, &bus->range[off-1]) == 0)
3324                 off--;
3325 
3326         return off;
3327 }
3328 
3329 static int __kvm_io_bus_write(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3330                               struct kvm_io_range *range, const void *val)
3331 {
3332         int idx;
3333 
3334         idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3335         if (idx < 0)
3336                 return -EOPNOTSUPP;
3337 
3338         while (idx < bus->dev_count &&
3339                 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3340                 if (!kvm_iodevice_write(vcpu, bus->range[idx].dev, range->addr,
3341                                         range->len, val))
3342                         return idx;
3343                 idx++;
3344         }
3345 
3346         return -EOPNOTSUPP;
3347 }
3348 
3349 /* kvm_io_bus_write - called under kvm->slots_lock */
3350 int kvm_io_bus_write(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3351                      int len, const void *val)
3352 {
3353         struct kvm_io_bus *bus;
3354         struct kvm_io_range range;
3355         int r;
3356 
3357         range = (struct kvm_io_range) {
3358                 .addr = addr,
3359                 .len = len,
3360         };
3361 
3362         bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3363         r = __kvm_io_bus_write(vcpu, bus, &range, val);
3364         return r < 0 ? r : 0;
3365 }
3366 
3367 /* kvm_io_bus_write_cookie - called under kvm->slots_lock */
3368 int kvm_io_bus_write_cookie(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx,
3369                             gpa_t addr, int len, const void *val, long cookie)
3370 {
3371         struct kvm_io_bus *bus;
3372         struct kvm_io_range range;
3373 
3374         range = (struct kvm_io_range) {
3375                 .addr = addr,
3376                 .len = len,
3377         };
3378 
3379         bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3380 
3381         /* First try the device referenced by cookie. */
3382         if ((cookie >= 0) && (cookie < bus->dev_count) &&
3383             (kvm_io_bus_cmp(&range, &bus->range[cookie]) == 0))
3384                 if (!kvm_iodevice_write(vcpu, bus->range[cookie].dev, addr, len,
3385                                         val))
3386                         return cookie;
3387 
3388         /*
3389          * cookie contained garbage; fall back to search and return the
3390          * correct cookie value.
3391          */
3392         return __kvm_io_bus_write(vcpu, bus, &range, val);
3393 }
3394 
3395 static int __kvm_io_bus_read(struct kvm_vcpu *vcpu, struct kvm_io_bus *bus,
3396                              struct kvm_io_range *range, void *val)
3397 {
3398         int idx;
3399 
3400         idx = kvm_io_bus_get_first_dev(bus, range->addr, range->len);
3401         if (idx < 0)
3402                 return -EOPNOTSUPP;
3403 
3404         while (idx < bus->dev_count &&
3405                 kvm_io_bus_cmp(range, &bus->range[idx]) == 0) {
3406                 if (!kvm_iodevice_read(vcpu, bus->range[idx].dev, range->addr,
3407                                        range->len, val))
3408                         return idx;
3409                 idx++;
3410         }
3411 
3412         return -EOPNOTSUPP;
3413 }
3414 EXPORT_SYMBOL_GPL(kvm_io_bus_write);
3415 
3416 /* kvm_io_bus_read - called under kvm->slots_lock */
3417 int kvm_io_bus_read(struct kvm_vcpu *vcpu, enum kvm_bus bus_idx, gpa_t addr,
3418                     int len, void *val)
3419 {
3420         struct kvm_io_bus *bus;
3421         struct kvm_io_range range;
3422         int r;
3423 
3424         range = (struct kvm_io_range) {
3425                 .addr = addr,
3426                 .len = len,
3427         };
3428 
3429         bus = srcu_dereference(vcpu->kvm->buses[bus_idx], &vcpu->kvm->srcu);
3430         r = __kvm_io_bus_read(vcpu, bus, &range, val);
3431         return r < 0 ? r : 0;
3432 }
3433 
3434 
3435 /* Caller must hold slots_lock. */
3436 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
3437                             int len, struct kvm_io_device *dev)
3438 {
3439         struct kvm_io_bus *new_bus, *bus;
3440 
3441         bus = kvm->buses[bus_idx];
3442         /* exclude ioeventfd which is limited by maximum fd */
3443         if (bus->dev_count - bus->ioeventfd_count > NR_IOBUS_DEVS - 1)
3444                 return -ENOSPC;
3445 
3446         new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count + 1) *
3447                           sizeof(struct kvm_io_range)), GFP_KERNEL);
3448         if (!new_bus)
3449                 return -ENOMEM;
3450         memcpy(new_bus, bus, sizeof(*bus) + (bus->dev_count *
3451                sizeof(struct kvm_io_range)));
3452         kvm_io_bus_insert_dev(new_bus, dev, addr, len);
3453         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3454         synchronize_srcu_expedited(&kvm->srcu);
3455         kfree(bus);
3456 
3457         return 0;
3458 }
3459 
3460 /* Caller must hold slots_lock. */
3461 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
3462                               struct kvm_io_device *dev)
3463 {
3464         int i, r;
3465         struct kvm_io_bus *new_bus, *bus;
3466 
3467         bus = kvm->buses[bus_idx];
3468         r = -ENOENT;
3469         for (i = 0; i < bus->dev_count; i++)
3470                 if (bus->range[i].dev == dev) {
3471                         r = 0;
3472                         break;
3473                 }
3474 
3475         if (r)
3476                 return r;
3477 
3478         new_bus = kmalloc(sizeof(*bus) + ((bus->dev_count - 1) *
3479                           sizeof(struct kvm_io_range)), GFP_KERNEL);
3480         if (!new_bus)
3481                 return -ENOMEM;
3482 
3483         memcpy(new_bus, bus, sizeof(*bus) + i * sizeof(struct kvm_io_range));
3484         new_bus->dev_count--;
3485         memcpy(new_bus->range + i, bus->range + i + 1,
3486                (new_bus->dev_count - i) * sizeof(struct kvm_io_range));
3487 
3488         rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
3489         synchronize_srcu_expedited(&kvm->srcu);
3490         kfree(bus);
3491         return r;
3492 }
3493 
3494 static struct notifier_block kvm_cpu_notifier = {
3495         .notifier_call = kvm_cpu_hotplug,
3496 };
3497 
3498 static int kvm_debugfs_open(struct inode *inode, struct file *file,
3499                            int (*get)(void *, u64 *), int (*set)(void *, u64),
3500                            const char *fmt)
3501 {
3502         struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3503                                           inode->i_private;
3504 
3505         /* The debugfs files are a reference to the kvm struct which
3506          * is still valid when kvm_destroy_vm is called.
3507          * To avoid the race between open and the removal of the debugfs
3508          * directory we test against the users count.
3509          */
3510         if (!atomic_add_unless(&stat_data->kvm->users_count, 1, 0))
3511                 return -ENOENT;
3512 
3513         if (simple_attr_open(inode, file, get, set, fmt)) {
3514                 kvm_put_kvm(stat_data->kvm);
3515                 return -ENOMEM;
3516         }
3517 
3518         return 0;
3519 }
3520 
3521 static int kvm_debugfs_release(struct inode *inode, struct file *file)
3522 {
3523         struct kvm_stat_data *stat_data = (struct kvm_stat_data *)
3524                                           inode->i_private;
3525 
3526         simple_attr_release(inode, file);
3527         kvm_put_kvm(stat_data->kvm);
3528 
3529         return 0;
3530 }
3531 
3532 static int vm_stat_get_per_vm(void *data, u64 *val)
3533 {
3534         struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3535 
3536         *val = *(u32 *)((void *)stat_data->kvm + stat_data->offset);
3537 
3538         return 0;
3539 }
3540 
3541 static int vm_stat_get_per_vm_open(struct inode *inode, struct file *file)
3542 {
3543         __simple_attr_check_format("%llu\n", 0ull);
3544         return kvm_debugfs_open(inode, file, vm_stat_get_per_vm,
3545                                 NULL, "%llu\n");
3546 }
3547 
3548 static const struct file_operations vm_stat_get_per_vm_fops = {
3549         .owner   = THIS_MODULE,
3550         .open    = vm_stat_get_per_vm_open,
3551         .release = kvm_debugfs_release,
3552         .read    = simple_attr_read,
3553         .write   = simple_attr_write,
3554         .llseek  = generic_file_llseek,
3555 };
3556 
3557 static int vcpu_stat_get_per_vm(void *data, u64 *val)
3558 {
3559         int i;
3560         struct kvm_stat_data *stat_data = (struct kvm_stat_data *)data;
3561         struct kvm_vcpu *vcpu;
3562 
3563         *val = 0;
3564 
3565         kvm_for_each_vcpu(i, vcpu, stat_data->kvm)
3566                 *val += *(u32 *)((void *)vcpu + stat_data->offset);
3567 
3568         return 0;
3569 }
3570 
3571 static int vcpu_stat_get_per_vm_open(struct inode *inode, struct file *file)
3572 {
3573         __simple_attr_check_format("%llu\n", 0ull);
3574         return kvm_debugfs_open(inode, file, vcpu_stat_get_per_vm,
3575                                  NULL, "%llu\n");
3576 }
3577 
3578 static const struct file_operations vcpu_stat_get_per_vm_fops = {
3579         .owner   = THIS_MODULE,
3580         .open    = vcpu_stat_get_per_vm_open,
3581         .release = kvm_debugfs_release,
3582         .read    = simple_attr_read,
3583         .write   = simple_attr_write,
3584         .llseek  = generic_file_llseek,
3585 };
3586 
3587 static const struct file_operations *stat_fops_per_vm[] = {
3588         [KVM_STAT_VCPU] = &vcpu_stat_get_per_vm_fops,
3589         [KVM_STAT_VM]   = &vm_stat_get_per_vm_fops,
3590 };
3591 
3592 static int vm_stat_get(void *_offset, u64 *val)
3593 {
3594         unsigned offset = (long)_offset;
3595         struct kvm *kvm;
3596         struct kvm_stat_data stat_tmp = {.offset = offset};
3597         u64 tmp_val;
3598 
3599         *val = 0;
3600         spin_lock(&kvm_lock);
3601         list_for_each_entry(kvm, &vm_list, vm_list) {
3602                 stat_tmp.kvm = kvm;
3603                 vm_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3604                 *val += tmp_val;
3605         }
3606         spin_unlock(&kvm_lock);
3607         return 0;
3608 }
3609 
3610 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
3611 
3612 static int vcpu_stat_get(void *_offset, u64 *val)
3613 {
3614         unsigned offset = (long)_offset;
3615         struct kvm *kvm;
3616         struct kvm_stat_data stat_tmp = {.offset = offset};
3617         u64 tmp_val;
3618 
3619         *val = 0;
3620         spin_lock(&kvm_lock);
3621         list_for_each_entry(kvm, &vm_list, vm_list) {
3622                 stat_tmp.kvm = kvm;
3623                 vcpu_stat_get_per_vm((void *)&stat_tmp, &tmp_val);
3624                 *val += tmp_val;
3625         }
3626         spin_unlock(&kvm_lock);
3627         return 0;
3628 }
3629 
3630 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
3631 
3632 static const struct file_operations *stat_fops[] = {
3633         [KVM_STAT_VCPU] = &vcpu_stat_fops,
3634         [KVM_STAT_VM]   = &vm_stat_fops,
3635 };
3636 
3637 static int kvm_init_debug(void)
3638 {
3639         int r = -EEXIST;
3640         struct kvm_stats_debugfs_item *p;
3641 
3642         kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
3643         if (kvm_debugfs_dir == NULL)
3644                 goto out;
3645 
3646         kvm_debugfs_num_entries = 0;
3647         for (p = debugfs_entries; p->name; ++p, kvm_debugfs_num_entries++) {
3648                 if (!debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
3649                                          (void *)(long)p->offset,
3650                                          stat_fops[p->kind]))
3651                         goto out_dir;
3652         }
3653 
3654         return 0;
3655 
3656 out_dir:
3657         debugfs_remove_recursive(kvm_debugfs_dir);
3658 out:
3659         return r;
3660 }
3661 
3662 static int kvm_suspend(void)
3663 {
3664         if (kvm_usage_count)
3665                 hardware_disable_nolock(NULL);
3666         return 0;
3667 }
3668 
3669 static void kvm_resume(void)
3670 {
3671         if (kvm_usage_count) {
3672                 WARN_ON(raw_spin_is_locked(&kvm_count_lock));
3673                 hardware_enable_nolock(NULL);
3674         }
3675 }
3676 
3677 static struct syscore_ops kvm_syscore_ops = {
3678         .suspend = kvm_suspend,
3679         .resume = kvm_resume,
3680 };
3681 
3682 static inline
3683 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
3684 {
3685         return container_of(pn, struct kvm_vcpu, preempt_notifier);
3686 }
3687 
3688 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
3689 {
3690         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3691 
3692         if (vcpu->preempted)
3693                 vcpu->preempted = false;
3694 
3695         kvm_arch_sched_in(vcpu, cpu);
3696 
3697         kvm_arch_vcpu_load(vcpu, cpu);
3698 }
3699 
3700 static void kvm_sched_out(struct preempt_notifier *pn,
3701                           struct task_struct *next)
3702 {
3703         struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
3704 
3705         if (current->state == TASK_RUNNING)
3706                 vcpu->preempted = true;
3707         kvm_arch_vcpu_put(vcpu);
3708 }
3709 
3710 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
3711                   struct module *module)
3712 {
3713         int r;
3714         int cpu;
3715 
3716         r = kvm_arch_init(opaque);
3717         if (r)
3718                 goto out_fail;
3719 
3720         /*
3721          * kvm_arch_init makes sure there's at most one caller
3722          * for architectures that support multiple implementations,
3723          * like intel and amd on x86.
3724          * kvm_arch_init must be called before kvm_irqfd_init to avoid creating
3725          * conflicts in case kvm is already setup for another implementation.
3726          */
3727         r = kvm_irqfd_init();
3728         if (r)
3729                 goto out_irqfd;
3730 
3731         if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
3732                 r = -ENOMEM;
3733                 goto out_free_0;
3734         }
3735 
3736         r = kvm_arch_hardware_setup();
3737         if (r < 0)
3738                 goto out_free_0a;
3739 
3740         for_each_online_cpu(cpu) {
3741                 smp_call_function_single(cpu,
3742                                 kvm_arch_check_processor_compat,
3743                                 &r, 1);
3744                 if (r < 0)
3745                         goto out_free_1;
3746         }
3747 
3748         r = register_cpu_notifier(&kvm_cpu_notifier);
3749         if (r)
3750                 goto out_free_2;
3751         register_reboot_notifier(&kvm_reboot_notifier);
3752 
3753         /* A kmem cache lets us meet the alignment requirements of fx_save. */
3754         if (!vcpu_align)
3755                 vcpu_align = __alignof__(struct kvm_vcpu);
3756         kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
3757                                            0, NULL);
3758         if (!kvm_vcpu_cache) {
3759                 r = -ENOMEM;
3760                 goto out_free_3;
3761         }
3762 
3763         r = kvm_async_pf_init();
3764         if (r)
3765                 goto out_free;
3766 
3767         kvm_chardev_ops.owner = module;
3768         kvm_vm_fops.owner = module;
3769         kvm_vcpu_fops.owner = module;
3770 
3771         r = misc_register(&kvm_dev);
3772         if (r) {
3773                 pr_err("kvm: misc device register failed\n");
3774                 goto out_unreg;
3775         }
3776 
3777         register_syscore_ops(&kvm_syscore_ops);
3778 
3779         kvm_preempt_ops.sched_in = kvm_sched_in;
3780         kvm_preempt_ops.sched_out = kvm_sched_out;
3781 
3782         r = kvm_init_debug();
3783         if (r) {
3784                 pr_err("kvm: create debugfs files failed\n");
3785                 goto out_undebugfs;
3786         }
3787 
3788         r = kvm_vfio_ops_init();
3789         WARN_ON(r);
3790 
3791         return 0;
3792 
3793 out_undebugfs:
3794         unregister_syscore_ops(&kvm_syscore_ops);
3795         misc_deregister(&kvm_dev);
3796 out_unreg:
3797         kvm_async_pf_deinit();
3798 out_free:
3799         kmem_cache_destroy(kvm_vcpu_cache);
3800 out_free_3:
3801         unregister_reboot_notifier(&kvm_reboot_notifier);
3802         unregister_cpu_notifier(&kvm_cpu_notifier);
3803 out_free_2:
3804 out_free_1:
3805         kvm_arch_hardware_unsetup();
3806 out_free_0a:
3807         free_cpumask_var(cpus_hardware_enabled);
3808 out_free_0:
3809         kvm_irqfd_exit();
3810 out_irqfd:
3811         kvm_arch_exit();
3812 out_fail:
3813         return r;
3814 }
3815 EXPORT_SYMBOL_GPL(kvm_init);
3816 
3817 void kvm_exit(void)
3818 {
3819         debugfs_remove_recursive(kvm_debugfs_dir);
3820         misc_deregister(&kvm_dev);
3821         kmem_cache_destroy(kvm_vcpu_cache);
3822         kvm_async_pf_deinit();
3823         unregister_syscore_ops(&kvm_syscore_ops);
3824         unregister_reboot_notifier(&kvm_reboot_notifier);
3825         unregister_cpu_notifier(&kvm_cpu_notifier);
3826         on_each_cpu(hardware_disable_nolock, NULL, 1);
3827         kvm_arch_hardware_unsetup();
3828         kvm_arch_exit();
3829         kvm_irqfd_exit();
3830         free_cpumask_var(cpus_hardware_enabled);
3831         kvm_vfio_ops_exit();
3832 }
3833 EXPORT_SYMBOL_GPL(kvm_exit);
3834 

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