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rt2800usb: Move ID out of unknown
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / virt / kvm / kvm_main.c
blobaefdda390f5e73f297897db863da1ee9e129a6a8
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 "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
51 #include <asm/processor.h>
52 #include <asm/io.h>
53 #include <asm/uaccess.h>
54 #include <asm/pgtable.h>
55
56 #include "coalesced_mmio.h"
57 #include "async_pf.h"
58
59 #define CREATE_TRACE_POINTS
60 #include <trace/events/kvm.h>
61
62 MODULE_AUTHOR("Qumranet");
63 MODULE_LICENSE("GPL");
64
65 /*
66 * Ordering of locks:
67 *
68 * kvm->lock --> kvm->slots_lock --> kvm->irq_lock
69 */
70
71 DEFINE_RAW_SPINLOCK(kvm_lock);
72 LIST_HEAD(vm_list);
73
74 static cpumask_var_t cpus_hardware_enabled;
75 static int kvm_usage_count = 0;
76 static atomic_t hardware_enable_failed;
77
78 struct kmem_cache *kvm_vcpu_cache;
79 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
80
81 static __read_mostly struct preempt_ops kvm_preempt_ops;
82
83 struct dentry *kvm_debugfs_dir;
84
85 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
86 unsigned long arg);
87 #ifdef CONFIG_COMPAT
88 static long kvm_vcpu_compat_ioctl(struct file *file, unsigned int ioctl,
89 unsigned long arg);
90 #endif
91 static int hardware_enable_all(void);
92 static void hardware_disable_all(void);
93
94 static void kvm_io_bus_destroy(struct kvm_io_bus *bus);
95
96 bool kvm_rebooting;
97 EXPORT_SYMBOL_GPL(kvm_rebooting);
98
99 static bool largepages_enabled = true;
100
101 static struct page *hwpoison_page;
102 static pfn_t hwpoison_pfn;
103
104 struct page *fault_page;
105 pfn_t fault_pfn;
106
107 inline int kvm_is_mmio_pfn(pfn_t pfn)
108 {
109 if (pfn_valid(pfn)) {
110 int reserved;
111 struct page *tail = pfn_to_page(pfn);
112 struct page *head = compound_trans_head(tail);
113 reserved = PageReserved(head);
114 if (head != tail) {
115 /*
116 * "head" is not a dangling pointer
117 * (compound_trans_head takes care of that)
118 * but the hugepage may have been splitted
119 * from under us (and we may not hold a
120 * reference count on the head page so it can
121 * be reused before we run PageReferenced), so
122 * we've to check PageTail before returning
123 * what we just read.
124 */
125 smp_rmb();
126 if (PageTail(tail))
127 return reserved;
128 }
129 return PageReserved(tail);
130 }
131
132 return true;
133 }
134
135 /*
136 * Switches to specified vcpu, until a matching vcpu_put()
137 */
138 void vcpu_load(struct kvm_vcpu *vcpu)
139 {
140 int cpu;
141
142 mutex_lock(&vcpu->mutex);
143 if (unlikely(vcpu->pid != current->pids[PIDTYPE_PID].pid)) {
144 /* The thread running this VCPU changed. */
145 struct pid *oldpid = vcpu->pid;
146 struct pid *newpid = get_task_pid(current, PIDTYPE_PID);
147 rcu_assign_pointer(vcpu->pid, newpid);
148 synchronize_rcu();
149 put_pid(oldpid);
150 }
151 cpu = get_cpu();
152 preempt_notifier_register(&vcpu->preempt_notifier);
153 kvm_arch_vcpu_load(vcpu, cpu);
154 put_cpu();
155 }
156
157 void vcpu_put(struct kvm_vcpu *vcpu)
158 {
159 preempt_disable();
160 kvm_arch_vcpu_put(vcpu);
161 preempt_notifier_unregister(&vcpu->preempt_notifier);
162 preempt_enable();
163 mutex_unlock(&vcpu->mutex);
164 }
165
166 static void ack_flush(void *_completed)
167 {
168 }
169
170 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
171 {
172 int i, cpu, me;
173 cpumask_var_t cpus;
174 bool called = true;
175 struct kvm_vcpu *vcpu;
176
177 zalloc_cpumask_var(&cpus, GFP_ATOMIC);
178
179 me = get_cpu();
180 kvm_for_each_vcpu(i, vcpu, kvm) {
181 kvm_make_request(req, vcpu);
182 cpu = vcpu->cpu;
183
184 /* Set ->requests bit before we read ->mode */
185 smp_mb();
186
187 if (cpus != NULL && cpu != -1 && cpu != me &&
188 kvm_vcpu_exiting_guest_mode(vcpu) != OUTSIDE_GUEST_MODE)
189 cpumask_set_cpu(cpu, cpus);
190 }
191 if (unlikely(cpus == NULL))
192 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
193 else if (!cpumask_empty(cpus))
194 smp_call_function_many(cpus, ack_flush, NULL, 1);
195 else
196 called = false;
197 put_cpu();
198 free_cpumask_var(cpus);
199 return called;
200 }
201
202 void kvm_flush_remote_tlbs(struct kvm *kvm)
203 {
204 int dirty_count = kvm->tlbs_dirty;
205
206 smp_mb();
207 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
208 ++kvm->stat.remote_tlb_flush;
209 cmpxchg(&kvm->tlbs_dirty, dirty_count, 0);
210 }
211
212 void kvm_reload_remote_mmus(struct kvm *kvm)
213 {
214 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
215 }
216
217 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
218 {
219 struct page *page;
220 int r;
221
222 mutex_init(&vcpu->mutex);
223 vcpu->cpu = -1;
224 vcpu->kvm = kvm;
225 vcpu->vcpu_id = id;
226 vcpu->pid = NULL;
227 init_waitqueue_head(&vcpu->wq);
228 kvm_async_pf_vcpu_init(vcpu);
229
230 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
231 if (!page) {
232 r = -ENOMEM;
233 goto fail;
234 }
235 vcpu->run = page_address(page);
236
237 r = kvm_arch_vcpu_init(vcpu);
238 if (r < 0)
239 goto fail_free_run;
240 return 0;
241
242 fail_free_run:
243 free_page((unsigned long)vcpu->run);
244 fail:
245 return r;
246 }
247 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
248
249 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
250 {
251 put_pid(vcpu->pid);
252 kvm_arch_vcpu_uninit(vcpu);
253 free_page((unsigned long)vcpu->run);
254 }
255 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
256
257 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
258 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
259 {
260 return container_of(mn, struct kvm, mmu_notifier);
261 }
262
263 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
264 struct mm_struct *mm,
265 unsigned long address)
266 {
267 struct kvm *kvm = mmu_notifier_to_kvm(mn);
268 int need_tlb_flush, idx;
269
270 /*
271 * When ->invalidate_page runs, the linux pte has been zapped
272 * already but the page is still allocated until
273 * ->invalidate_page returns. So if we increase the sequence
274 * here the kvm page fault will notice if the spte can't be
275 * established because the page is going to be freed. If
276 * instead the kvm page fault establishes the spte before
277 * ->invalidate_page runs, kvm_unmap_hva will release it
278 * before returning.
279 *
280 * The sequence increase only need to be seen at spin_unlock
281 * time, and not at spin_lock time.
282 *
283 * Increasing the sequence after the spin_unlock would be
284 * unsafe because the kvm page fault could then establish the
285 * pte after kvm_unmap_hva returned, without noticing the page
286 * is going to be freed.
287 */
288 idx = srcu_read_lock(&kvm->srcu);
289 spin_lock(&kvm->mmu_lock);
290 kvm->mmu_notifier_seq++;
291 need_tlb_flush = kvm_unmap_hva(kvm, address) | kvm->tlbs_dirty;
292 spin_unlock(&kvm->mmu_lock);
293 srcu_read_unlock(&kvm->srcu, idx);
294
295 /* we've to flush the tlb before the pages can be freed */
296 if (need_tlb_flush)
297 kvm_flush_remote_tlbs(kvm);
298
299 }
300
301 static void kvm_mmu_notifier_change_pte(struct mmu_notifier *mn,
302 struct mm_struct *mm,
303 unsigned long address,
304 pte_t pte)
305 {
306 struct kvm *kvm = mmu_notifier_to_kvm(mn);
307 int idx;
308
309 idx = srcu_read_lock(&kvm->srcu);
310 spin_lock(&kvm->mmu_lock);
311 kvm->mmu_notifier_seq++;
312 kvm_set_spte_hva(kvm, address, pte);
313 spin_unlock(&kvm->mmu_lock);
314 srcu_read_unlock(&kvm->srcu, idx);
315 }
316
317 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
318 struct mm_struct *mm,
319 unsigned long start,
320 unsigned long end)
321 {
322 struct kvm *kvm = mmu_notifier_to_kvm(mn);
323 int need_tlb_flush = 0, idx;
324
325 idx = srcu_read_lock(&kvm->srcu);
326 spin_lock(&kvm->mmu_lock);
327 /*
328 * The count increase must become visible at unlock time as no
329 * spte can be established without taking the mmu_lock and
330 * count is also read inside the mmu_lock critical section.
331 */
332 kvm->mmu_notifier_count++;
333 for (; start < end; start += PAGE_SIZE)
334 need_tlb_flush |= kvm_unmap_hva(kvm, start);
335 need_tlb_flush |= kvm->tlbs_dirty;
336 spin_unlock(&kvm->mmu_lock);
337 srcu_read_unlock(&kvm->srcu, idx);
338
339 /* we've to flush the tlb before the pages can be freed */
340 if (need_tlb_flush)
341 kvm_flush_remote_tlbs(kvm);
342 }
343
344 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
345 struct mm_struct *mm,
346 unsigned long start,
347 unsigned long end)
348 {
349 struct kvm *kvm = mmu_notifier_to_kvm(mn);
350
351 spin_lock(&kvm->mmu_lock);
352 /*
353 * This sequence increase will notify the kvm page fault that
354 * the page that is going to be mapped in the spte could have
355 * been freed.
356 */
357 kvm->mmu_notifier_seq++;
358 /*
359 * The above sequence increase must be visible before the
360 * below count decrease but both values are read by the kvm
361 * page fault under mmu_lock spinlock so we don't need to add
362 * a smb_wmb() here in between the two.
363 */
364 kvm->mmu_notifier_count--;
365 spin_unlock(&kvm->mmu_lock);
366
367 BUG_ON(kvm->mmu_notifier_count < 0);
368 }
369
370 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
371 struct mm_struct *mm,
372 unsigned long address)
373 {
374 struct kvm *kvm = mmu_notifier_to_kvm(mn);
375 int young, idx;
376
377 idx = srcu_read_lock(&kvm->srcu);
378 spin_lock(&kvm->mmu_lock);
379 young = kvm_age_hva(kvm, address);
380 spin_unlock(&kvm->mmu_lock);
381 srcu_read_unlock(&kvm->srcu, idx);
382
383 if (young)
384 kvm_flush_remote_tlbs(kvm);
385
386 return young;
387 }
388
389 static int kvm_mmu_notifier_test_young(struct mmu_notifier *mn,
390 struct mm_struct *mm,
391 unsigned long address)
392 {
393 struct kvm *kvm = mmu_notifier_to_kvm(mn);
394 int young, idx;
395
396 idx = srcu_read_lock(&kvm->srcu);
397 spin_lock(&kvm->mmu_lock);
398 young = kvm_test_age_hva(kvm, address);
399 spin_unlock(&kvm->mmu_lock);
400 srcu_read_unlock(&kvm->srcu, idx);
401
402 return young;
403 }
404
405 static void kvm_mmu_notifier_release(struct mmu_notifier *mn,
406 struct mm_struct *mm)
407 {
408 struct kvm *kvm = mmu_notifier_to_kvm(mn);
409 int idx;
410
411 idx = srcu_read_lock(&kvm->srcu);
412 kvm_arch_flush_shadow(kvm);
413 srcu_read_unlock(&kvm->srcu, idx);
414 }
415
416 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
417 .invalidate_page = kvm_mmu_notifier_invalidate_page,
418 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
419 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
420 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
421 .test_young = kvm_mmu_notifier_test_young,
422 .change_pte = kvm_mmu_notifier_change_pte,
423 .release = kvm_mmu_notifier_release,
424 };
425
426 static int kvm_init_mmu_notifier(struct kvm *kvm)
427 {
428 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
429 return mmu_notifier_register(&kvm->mmu_notifier, current->mm);
430 }
431
432 #else /* !(CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER) */
433
434 static int kvm_init_mmu_notifier(struct kvm *kvm)
435 {
436 return 0;
437 }
438
439 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
440
441 static struct kvm *kvm_create_vm(void)
442 {
443 int r, i;
444 struct kvm *kvm = kvm_arch_alloc_vm();
445
446 if (!kvm)
447 return ERR_PTR(-ENOMEM);
448
449 r = kvm_arch_init_vm(kvm);
450 if (r)
451 goto out_err_nodisable;
452
453 r = hardware_enable_all();
454 if (r)
455 goto out_err_nodisable;
456
457 #ifdef CONFIG_HAVE_KVM_IRQCHIP
458 INIT_HLIST_HEAD(&kvm->mask_notifier_list);
459 INIT_HLIST_HEAD(&kvm->irq_ack_notifier_list);
460 #endif
461
462 r = -ENOMEM;
463 kvm->memslots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
464 if (!kvm->memslots)
465 goto out_err_nosrcu;
466 if (init_srcu_struct(&kvm->srcu))
467 goto out_err_nosrcu;
468 for (i = 0; i < KVM_NR_BUSES; i++) {
469 kvm->buses[i] = kzalloc(sizeof(struct kvm_io_bus),
470 GFP_KERNEL);
471 if (!kvm->buses[i])
472 goto out_err;
473 }
474
475 spin_lock_init(&kvm->mmu_lock);
476 kvm->mm = current->mm;
477 atomic_inc(&kvm->mm->mm_count);
478 kvm_eventfd_init(kvm);
479 mutex_init(&kvm->lock);
480 mutex_init(&kvm->irq_lock);
481 mutex_init(&kvm->slots_lock);
482 atomic_set(&kvm->users_count, 1);
483
484 r = kvm_init_mmu_notifier(kvm);
485 if (r)
486 goto out_err;
487
488 raw_spin_lock(&kvm_lock);
489 list_add(&kvm->vm_list, &vm_list);
490 raw_spin_unlock(&kvm_lock);
491
492 return kvm;
493
494 out_err:
495 cleanup_srcu_struct(&kvm->srcu);
496 out_err_nosrcu:
497 hardware_disable_all();
498 out_err_nodisable:
499 for (i = 0; i < KVM_NR_BUSES; i++)
500 kfree(kvm->buses[i]);
501 kfree(kvm->memslots);
502 kvm_arch_free_vm(kvm);
503 return ERR_PTR(r);
504 }
505
506 static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
507 {
508 if (!memslot->dirty_bitmap)
509 return;
510
511 if (2 * kvm_dirty_bitmap_bytes(memslot) > PAGE_SIZE)
512 vfree(memslot->dirty_bitmap_head);
513 else
514 kfree(memslot->dirty_bitmap_head);
515
516 memslot->dirty_bitmap = NULL;
517 memslot->dirty_bitmap_head = NULL;
518 }
519
520 /*
521 * Free any memory in @free but not in @dont.
522 */
523 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
524 struct kvm_memory_slot *dont)
525 {
526 int i;
527
528 if (!dont || free->rmap != dont->rmap)
529 vfree(free->rmap);
530
531 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
532 kvm_destroy_dirty_bitmap(free);
533
534
535 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
536 if (!dont || free->lpage_info[i] != dont->lpage_info[i]) {
537 vfree(free->lpage_info[i]);
538 free->lpage_info[i] = NULL;
539 }
540 }
541
542 free->npages = 0;
543 free->rmap = NULL;
544 }
545
546 void kvm_free_physmem(struct kvm *kvm)
547 {
548 int i;
549 struct kvm_memslots *slots = kvm->memslots;
550
551 for (i = 0; i < slots->nmemslots; ++i)
552 kvm_free_physmem_slot(&slots->memslots[i], NULL);
553
554 kfree(kvm->memslots);
555 }
556
557 static void kvm_destroy_vm(struct kvm *kvm)
558 {
559 int i;
560 struct mm_struct *mm = kvm->mm;
561
562 kvm_arch_sync_events(kvm);
563 raw_spin_lock(&kvm_lock);
564 list_del(&kvm->vm_list);
565 raw_spin_unlock(&kvm_lock);
566 kvm_free_irq_routing(kvm);
567 for (i = 0; i < KVM_NR_BUSES; i++)
568 kvm_io_bus_destroy(kvm->buses[i]);
569 kvm_coalesced_mmio_free(kvm);
570 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
571 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
572 #else
573 kvm_arch_flush_shadow(kvm);
574 #endif
575 kvm_arch_destroy_vm(kvm);
576 kvm_free_physmem(kvm);
577 cleanup_srcu_struct(&kvm->srcu);
578 kvm_arch_free_vm(kvm);
579 hardware_disable_all();
580 mmdrop(mm);
581 }
582
583 void kvm_get_kvm(struct kvm *kvm)
584 {
585 atomic_inc(&kvm->users_count);
586 }
587 EXPORT_SYMBOL_GPL(kvm_get_kvm);
588
589 void kvm_put_kvm(struct kvm *kvm)
590 {
591 if (atomic_dec_and_test(&kvm->users_count))
592 kvm_destroy_vm(kvm);
593 }
594 EXPORT_SYMBOL_GPL(kvm_put_kvm);
595
596
597 static int kvm_vm_release(struct inode *inode, struct file *filp)
598 {
599 struct kvm *kvm = filp->private_data;
600
601 kvm_irqfd_release(kvm);
602
603 kvm_put_kvm(kvm);
604 return 0;
605 }
606
607 #ifndef CONFIG_S390
608 /*
609 * Allocation size is twice as large as the actual dirty bitmap size.
610 * This makes it possible to do double buffering: see x86's
611 * kvm_vm_ioctl_get_dirty_log().
612 */
613 static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
614 {
615 unsigned long dirty_bytes = 2 * kvm_dirty_bitmap_bytes(memslot);
616
617 if (dirty_bytes > PAGE_SIZE)
618 memslot->dirty_bitmap = vzalloc(dirty_bytes);
619 else
620 memslot->dirty_bitmap = kzalloc(dirty_bytes, GFP_KERNEL);
621
622 if (!memslot->dirty_bitmap)
623 return -ENOMEM;
624
625 memslot->dirty_bitmap_head = memslot->dirty_bitmap;
626 return 0;
627 }
628 #endif /* !CONFIG_S390 */
629
630 /*
631 * Allocate some memory and give it an address in the guest physical address
632 * space.
633 *
634 * Discontiguous memory is allowed, mostly for framebuffers.
635 *
636 * Must be called holding mmap_sem for write.
637 */
638 int __kvm_set_memory_region(struct kvm *kvm,
639 struct kvm_userspace_memory_region *mem,
640 int user_alloc)
641 {
642 int r;
643 gfn_t base_gfn;
644 unsigned long npages;
645 unsigned long i;
646 struct kvm_memory_slot *memslot;
647 struct kvm_memory_slot old, new;
648 struct kvm_memslots *slots, *old_memslots;
649
650 r = -EINVAL;
651 /* General sanity checks */
652 if (mem->memory_size & (PAGE_SIZE - 1))
653 goto out;
654 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
655 goto out;
656 /* We can read the guest memory with __xxx_user() later on. */
657 if (user_alloc &&
658 ((mem->userspace_addr & (PAGE_SIZE - 1)) ||
659 !access_ok(VERIFY_WRITE,
660 (void __user *)(unsigned long)mem->userspace_addr,
661 mem->memory_size)))
662 goto out;
663 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
664 goto out;
665 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
666 goto out;
667
668 memslot = &kvm->memslots->memslots[mem->slot];
669 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
670 npages = mem->memory_size >> PAGE_SHIFT;
671
672 r = -EINVAL;
673 if (npages > KVM_MEM_MAX_NR_PAGES)
674 goto out;
675
676 if (!npages)
677 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
678
679 new = old = *memslot;
680
681 new.id = mem->slot;
682 new.base_gfn = base_gfn;
683 new.npages = npages;
684 new.flags = mem->flags;
685
686 /* Disallow changing a memory slot's size. */
687 r = -EINVAL;
688 if (npages && old.npages && npages != old.npages)
689 goto out_free;
690
691 /* Check for overlaps */
692 r = -EEXIST;
693 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
694 struct kvm_memory_slot *s = &kvm->memslots->memslots[i];
695
696 if (s == memslot || !s->npages)
697 continue;
698 if (!((base_gfn + npages <= s->base_gfn) ||
699 (base_gfn >= s->base_gfn + s->npages)))
700 goto out_free;
701 }
702
703 /* Free page dirty bitmap if unneeded */
704 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
705 new.dirty_bitmap = NULL;
706
707 r = -ENOMEM;
708
709 /* Allocate if a slot is being created */
710 #ifndef CONFIG_S390
711 if (npages && !new.rmap) {
712 new.rmap = vzalloc(npages * sizeof(*new.rmap));
713
714 if (!new.rmap)
715 goto out_free;
716
717 new.user_alloc = user_alloc;
718 new.userspace_addr = mem->userspace_addr;
719 }
720 if (!npages)
721 goto skip_lpage;
722
723 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
724 unsigned long ugfn;
725 unsigned long j;
726 int lpages;
727 int level = i + 2;
728
729 /* Avoid unused variable warning if no large pages */
730 (void)level;
731
732 if (new.lpage_info[i])
733 continue;
734
735 lpages = 1 + ((base_gfn + npages - 1)
736 >> KVM_HPAGE_GFN_SHIFT(level));
737 lpages -= base_gfn >> KVM_HPAGE_GFN_SHIFT(level);
738
739 new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
740
741 if (!new.lpage_info[i])
742 goto out_free;
743
744 if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
745 new.lpage_info[i][0].write_count = 1;
746 if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
747 new.lpage_info[i][lpages - 1].write_count = 1;
748 ugfn = new.userspace_addr >> PAGE_SHIFT;
749 /*
750 * If the gfn and userspace address are not aligned wrt each
751 * other, or if explicitly asked to, disable large page
752 * support for this slot
753 */
754 if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
755 !largepages_enabled)
756 for (j = 0; j < lpages; ++j)
757 new.lpage_info[i][j].write_count = 1;
758 }
759
760 skip_lpage:
761
762 /* Allocate page dirty bitmap if needed */
763 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
764 if (kvm_create_dirty_bitmap(&new) < 0)
765 goto out_free;
766 /* destroy any largepage mappings for dirty tracking */
767 }
768 #else /* not defined CONFIG_S390 */
769 new.user_alloc = user_alloc;
770 if (user_alloc)
771 new.userspace_addr = mem->userspace_addr;
772 #endif /* not defined CONFIG_S390 */
773
774 if (!npages) {
775 r = -ENOMEM;
776 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
777 if (!slots)
778 goto out_free;
779 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
780 if (mem->slot >= slots->nmemslots)
781 slots->nmemslots = mem->slot + 1;
782 slots->generation++;
783 slots->memslots[mem->slot].flags |= KVM_MEMSLOT_INVALID;
784
785 old_memslots = kvm->memslots;
786 rcu_assign_pointer(kvm->memslots, slots);
787 synchronize_srcu_expedited(&kvm->srcu);
788 /* From this point no new shadow pages pointing to a deleted
789 * memslot will be created.
790 *
791 * validation of sp->gfn happens in:
792 * - gfn_to_hva (kvm_read_guest, gfn_to_pfn)
793 * - kvm_is_visible_gfn (mmu_check_roots)
794 */
795 kvm_arch_flush_shadow(kvm);
796 kfree(old_memslots);
797 }
798
799 r = kvm_arch_prepare_memory_region(kvm, &new, old, mem, user_alloc);
800 if (r)
801 goto out_free;
802
803 /* map the pages in iommu page table */
804 if (npages) {
805 r = kvm_iommu_map_pages(kvm, &new);
806 if (r)
807 goto out_free;
808 }
809
810 r = -ENOMEM;
811 slots = kzalloc(sizeof(struct kvm_memslots), GFP_KERNEL);
812 if (!slots)
813 goto out_free;
814 memcpy(slots, kvm->memslots, sizeof(struct kvm_memslots));
815 if (mem->slot >= slots->nmemslots)
816 slots->nmemslots = mem->slot + 1;
817 slots->generation++;
818
819 /* actual memory is freed via old in kvm_free_physmem_slot below */
820 if (!npages) {
821 new.rmap = NULL;
822 new.dirty_bitmap = NULL;
823 for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i)
824 new.lpage_info[i] = NULL;
825 }
826
827 slots->memslots[mem->slot] = new;
828 old_memslots = kvm->memslots;
829 rcu_assign_pointer(kvm->memslots, slots);
830 synchronize_srcu_expedited(&kvm->srcu);
831
832 kvm_arch_commit_memory_region(kvm, mem, old, user_alloc);
833
834 /*
835 * If the new memory slot is created, we need to clear all
836 * mmio sptes.
837 */
838 if (npages && old.base_gfn != mem->guest_phys_addr >> PAGE_SHIFT)
839 kvm_arch_flush_shadow(kvm);
840
841 kvm_free_physmem_slot(&old, &new);
842 kfree(old_memslots);
843
844 return 0;
845
846 out_free:
847 kvm_free_physmem_slot(&new, &old);
848 out:
849 return r;
850
851 }
852 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
853
854 int kvm_set_memory_region(struct kvm *kvm,
855 struct kvm_userspace_memory_region *mem,
856 int user_alloc)
857 {
858 int r;
859
860 mutex_lock(&kvm->slots_lock);
861 r = __kvm_set_memory_region(kvm, mem, user_alloc);
862 mutex_unlock(&kvm->slots_lock);
863 return r;
864 }
865 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
866
867 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
868 struct
869 kvm_userspace_memory_region *mem,
870 int user_alloc)
871 {
872 if (mem->slot >= KVM_MEMORY_SLOTS)
873 return -EINVAL;
874 return kvm_set_memory_region(kvm, mem, user_alloc);
875 }
876
877 int kvm_get_dirty_log(struct kvm *kvm,
878 struct kvm_dirty_log *log, int *is_dirty)
879 {
880 struct kvm_memory_slot *memslot;
881 int r, i;
882 unsigned long n;
883 unsigned long any = 0;
884
885 r = -EINVAL;
886 if (log->slot >= KVM_MEMORY_SLOTS)
887 goto out;
888
889 memslot = &kvm->memslots->memslots[log->slot];
890 r = -ENOENT;
891 if (!memslot->dirty_bitmap)
892 goto out;
893
894 n = kvm_dirty_bitmap_bytes(memslot);
895
896 for (i = 0; !any && i < n/sizeof(long); ++i)
897 any = memslot->dirty_bitmap[i];
898
899 r = -EFAULT;
900 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
901 goto out;
902
903 if (any)
904 *is_dirty = 1;
905
906 r = 0;
907 out:
908 return r;
909 }
910
911 void kvm_disable_largepages(void)
912 {
913 largepages_enabled = false;
914 }
915 EXPORT_SYMBOL_GPL(kvm_disable_largepages);
916
917 int is_error_page(struct page *page)
918 {
919 return page == bad_page || page == hwpoison_page || page == fault_page;
920 }
921 EXPORT_SYMBOL_GPL(is_error_page);
922
923 int is_error_pfn(pfn_t pfn)
924 {
925 return pfn == bad_pfn || pfn == hwpoison_pfn || pfn == fault_pfn;
926 }
927 EXPORT_SYMBOL_GPL(is_error_pfn);
928
929 int is_hwpoison_pfn(pfn_t pfn)
930 {
931 return pfn == hwpoison_pfn;
932 }
933 EXPORT_SYMBOL_GPL(is_hwpoison_pfn);
934
935 int is_fault_pfn(pfn_t pfn)
936 {
937 return pfn == fault_pfn;
938 }
939 EXPORT_SYMBOL_GPL(is_fault_pfn);
940
941 int is_noslot_pfn(pfn_t pfn)
942 {
943 return pfn == bad_pfn;
944 }
945 EXPORT_SYMBOL_GPL(is_noslot_pfn);
946
947 int is_invalid_pfn(pfn_t pfn)
948 {
949 return pfn == hwpoison_pfn || pfn == fault_pfn;
950 }
951 EXPORT_SYMBOL_GPL(is_invalid_pfn);
952
953 static inline unsigned long bad_hva(void)
954 {
955 return PAGE_OFFSET;
956 }
957
958 int kvm_is_error_hva(unsigned long addr)
959 {
960 return addr == bad_hva();
961 }
962 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
963
964 static struct kvm_memory_slot *__gfn_to_memslot(struct kvm_memslots *slots,
965 gfn_t gfn)
966 {
967 int i;
968
969 for (i = 0; i < slots->nmemslots; ++i) {
970 struct kvm_memory_slot *memslot = &slots->memslots[i];
971
972 if (gfn >= memslot->base_gfn
973 && gfn < memslot->base_gfn + memslot->npages)
974 return memslot;
975 }
976 return NULL;
977 }
978
979 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
980 {
981 return __gfn_to_memslot(kvm_memslots(kvm), gfn);
982 }
983 EXPORT_SYMBOL_GPL(gfn_to_memslot);
984
985 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
986 {
987 int i;
988 struct kvm_memslots *slots = kvm_memslots(kvm);
989
990 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
991 struct kvm_memory_slot *memslot = &slots->memslots[i];
992
993 if (memslot->flags & KVM_MEMSLOT_INVALID)
994 continue;
995
996 if (gfn >= memslot->base_gfn
997 && gfn < memslot->base_gfn + memslot->npages)
998 return 1;
999 }
1000 return 0;
1001 }
1002 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1003
1004 unsigned long kvm_host_page_size(struct kvm *kvm, gfn_t gfn)
1005 {
1006 struct vm_area_struct *vma;
1007 unsigned long addr, size;
1008
1009 size = PAGE_SIZE;
1010
1011 addr = gfn_to_hva(kvm, gfn);
1012 if (kvm_is_error_hva(addr))
1013 return PAGE_SIZE;
1014
1015 down_read(&current->mm->mmap_sem);
1016 vma = find_vma(current->mm, addr);
1017 if (!vma)
1018 goto out;
1019
1020 size = vma_kernel_pagesize(vma);
1021
1022 out:
1023 up_read(&current->mm->mmap_sem);
1024
1025 return size;
1026 }
1027
1028 static unsigned long gfn_to_hva_many(struct kvm_memory_slot *slot, gfn_t gfn,
1029 gfn_t *nr_pages)
1030 {
1031 if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
1032 return bad_hva();
1033
1034 if (nr_pages)
1035 *nr_pages = slot->npages - (gfn - slot->base_gfn);
1036
1037 return gfn_to_hva_memslot(slot, gfn);
1038 }
1039
1040 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1041 {
1042 return gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, NULL);
1043 }
1044 EXPORT_SYMBOL_GPL(gfn_to_hva);
1045
1046 static pfn_t get_fault_pfn(void)
1047 {
1048 get_page(fault_page);
1049 return fault_pfn;
1050 }
1051
1052 int get_user_page_nowait(struct task_struct *tsk, struct mm_struct *mm,
1053 unsigned long start, int write, struct page **page)
1054 {
1055 int flags = FOLL_TOUCH | FOLL_NOWAIT | FOLL_HWPOISON | FOLL_GET;
1056
1057 if (write)
1058 flags |= FOLL_WRITE;
1059
1060 return __get_user_pages(tsk, mm, start, 1, flags, page, NULL, NULL);
1061 }
1062
1063 static inline int check_user_page_hwpoison(unsigned long addr)
1064 {
1065 int rc, flags = FOLL_TOUCH | FOLL_HWPOISON | FOLL_WRITE;
1066
1067 rc = __get_user_pages(current, current->mm, addr, 1,
1068 flags, NULL, NULL, NULL);
1069 return rc == -EHWPOISON;
1070 }
1071
1072 static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic,
1073 bool *async, bool write_fault, bool *writable)
1074 {
1075 struct page *page[1];
1076 int npages = 0;
1077 pfn_t pfn;
1078
1079 /* we can do it either atomically or asynchronously, not both */
1080 BUG_ON(atomic && async);
1081
1082 BUG_ON(!write_fault && !writable);
1083
1084 if (writable)
1085 *writable = true;
1086
1087 if (atomic || async)
1088 npages = __get_user_pages_fast(addr, 1, 1, page);
1089
1090 if (unlikely(npages != 1) && !atomic) {
1091 might_sleep();
1092
1093 if (writable)
1094 *writable = write_fault;
1095
1096 if (async) {
1097 down_read(&current->mm->mmap_sem);
1098 npages = get_user_page_nowait(current, current->mm,
1099 addr, write_fault, page);
1100 up_read(&current->mm->mmap_sem);
1101 } else
1102 npages = get_user_pages_fast(addr, 1, write_fault,
1103 page);
1104
1105 /* map read fault as writable if possible */
1106 if (unlikely(!write_fault) && npages == 1) {
1107 struct page *wpage[1];
1108
1109 npages = __get_user_pages_fast(addr, 1, 1, wpage);
1110 if (npages == 1) {
1111 *writable = true;
1112 put_page(page[0]);
1113 page[0] = wpage[0];
1114 }
1115 npages = 1;
1116 }
1117 }
1118
1119 if (unlikely(npages != 1)) {
1120 struct vm_area_struct *vma;
1121
1122 if (atomic)
1123 return get_fault_pfn();
1124
1125 down_read(&current->mm->mmap_sem);
1126 if (npages == -EHWPOISON ||
1127 (!async && check_user_page_hwpoison(addr))) {
1128 up_read(&current->mm->mmap_sem);
1129 get_page(hwpoison_page);
1130 return page_to_pfn(hwpoison_page);
1131 }
1132
1133 vma = find_vma_intersection(current->mm, addr, addr+1);
1134
1135 if (vma == NULL)
1136 pfn = get_fault_pfn();
1137 else if ((vma->vm_flags & VM_PFNMAP)) {
1138 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) +
1139 vma->vm_pgoff;
1140 BUG_ON(!kvm_is_mmio_pfn(pfn));
1141 } else {
1142 if (async && (vma->vm_flags & VM_WRITE))
1143 *async = true;
1144 pfn = get_fault_pfn();
1145 }
1146 up_read(&current->mm->mmap_sem);
1147 } else
1148 pfn = page_to_pfn(page[0]);
1149
1150 return pfn;
1151 }
1152
1153 pfn_t hva_to_pfn_atomic(struct kvm *kvm, unsigned long addr)
1154 {
1155 return hva_to_pfn(kvm, addr, true, NULL, true, NULL);
1156 }
1157 EXPORT_SYMBOL_GPL(hva_to_pfn_atomic);
1158
1159 static pfn_t __gfn_to_pfn(struct kvm *kvm, gfn_t gfn, bool atomic, bool *async,
1160 bool write_fault, bool *writable)
1161 {
1162 unsigned long addr;
1163
1164 if (async)
1165 *async = false;
1166
1167 addr = gfn_to_hva(kvm, gfn);
1168 if (kvm_is_error_hva(addr)) {
1169 get_page(bad_page);
1170 return page_to_pfn(bad_page);
1171 }
1172
1173 return hva_to_pfn(kvm, addr, atomic, async, write_fault, writable);
1174 }
1175
1176 pfn_t gfn_to_pfn_atomic(struct kvm *kvm, gfn_t gfn)
1177 {
1178 return __gfn_to_pfn(kvm, gfn, true, NULL, true, NULL);
1179 }
1180 EXPORT_SYMBOL_GPL(gfn_to_pfn_atomic);
1181
1182 pfn_t gfn_to_pfn_async(struct kvm *kvm, gfn_t gfn, bool *async,
1183 bool write_fault, bool *writable)
1184 {
1185 return __gfn_to_pfn(kvm, gfn, false, async, write_fault, writable);
1186 }
1187 EXPORT_SYMBOL_GPL(gfn_to_pfn_async);
1188
1189 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1190 {
1191 return __gfn_to_pfn(kvm, gfn, false, NULL, true, NULL);
1192 }
1193 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1194
1195 pfn_t gfn_to_pfn_prot(struct kvm *kvm, gfn_t gfn, bool write_fault,
1196 bool *writable)
1197 {
1198 return __gfn_to_pfn(kvm, gfn, false, NULL, write_fault, writable);
1199 }
1200 EXPORT_SYMBOL_GPL(gfn_to_pfn_prot);
1201
1202 pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
1203 struct kvm_memory_slot *slot, gfn_t gfn)
1204 {
1205 unsigned long addr = gfn_to_hva_memslot(slot, gfn);
1206 return hva_to_pfn(kvm, addr, false, NULL, true, NULL);
1207 }
1208
1209 int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, struct page **pages,
1210 int nr_pages)
1211 {
1212 unsigned long addr;
1213 gfn_t entry;
1214
1215 addr = gfn_to_hva_many(gfn_to_memslot(kvm, gfn), gfn, &entry);
1216 if (kvm_is_error_hva(addr))
1217 return -1;
1218
1219 if (entry < nr_pages)
1220 return 0;
1221
1222 return __get_user_pages_fast(addr, nr_pages, 1, pages);
1223 }
1224 EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
1225
1226 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1227 {
1228 pfn_t pfn;
1229
1230 pfn = gfn_to_pfn(kvm, gfn);
1231 if (!kvm_is_mmio_pfn(pfn))
1232 return pfn_to_page(pfn);
1233
1234 WARN_ON(kvm_is_mmio_pfn(pfn));
1235
1236 get_page(bad_page);
1237 return bad_page;
1238 }
1239
1240 EXPORT_SYMBOL_GPL(gfn_to_page);
1241
1242 void kvm_release_page_clean(struct page *page)
1243 {
1244 kvm_release_pfn_clean(page_to_pfn(page));
1245 }
1246 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1247
1248 void kvm_release_pfn_clean(pfn_t pfn)
1249 {
1250 if (!kvm_is_mmio_pfn(pfn))
1251 put_page(pfn_to_page(pfn));
1252 }
1253 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1254
1255 void kvm_release_page_dirty(struct page *page)
1256 {
1257 kvm_release_pfn_dirty(page_to_pfn(page));
1258 }
1259 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1260
1261 void kvm_release_pfn_dirty(pfn_t pfn)
1262 {
1263 kvm_set_pfn_dirty(pfn);
1264 kvm_release_pfn_clean(pfn);
1265 }
1266 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1267
1268 void kvm_set_page_dirty(struct page *page)
1269 {
1270 kvm_set_pfn_dirty(page_to_pfn(page));
1271 }
1272 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1273
1274 void kvm_set_pfn_dirty(pfn_t pfn)
1275 {
1276 if (!kvm_is_mmio_pfn(pfn)) {
1277 struct page *page = pfn_to_page(pfn);
1278 if (!PageReserved(page))
1279 SetPageDirty(page);
1280 }
1281 }
1282 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1283
1284 void kvm_set_pfn_accessed(pfn_t pfn)
1285 {
1286 if (!kvm_is_mmio_pfn(pfn))
1287 mark_page_accessed(pfn_to_page(pfn));
1288 }
1289 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1290
1291 void kvm_get_pfn(pfn_t pfn)
1292 {
1293 if (!kvm_is_mmio_pfn(pfn))
1294 get_page(pfn_to_page(pfn));
1295 }
1296 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1297
1298 static int next_segment(unsigned long len, int offset)
1299 {
1300 if (len > PAGE_SIZE - offset)
1301 return PAGE_SIZE - offset;
1302 else
1303 return len;
1304 }
1305
1306 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1307 int len)
1308 {
1309 int r;
1310 unsigned long addr;
1311
1312 addr = gfn_to_hva(kvm, gfn);
1313 if (kvm_is_error_hva(addr))
1314 return -EFAULT;
1315 r = __copy_from_user(data, (void __user *)addr + offset, len);
1316 if (r)
1317 return -EFAULT;
1318 return 0;
1319 }
1320 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1321
1322 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1323 {
1324 gfn_t gfn = gpa >> PAGE_SHIFT;
1325 int seg;
1326 int offset = offset_in_page(gpa);
1327 int ret;
1328
1329 while ((seg = next_segment(len, offset)) != 0) {
1330 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1331 if (ret < 0)
1332 return ret;
1333 offset = 0;
1334 len -= seg;
1335 data += seg;
1336 ++gfn;
1337 }
1338 return 0;
1339 }
1340 EXPORT_SYMBOL_GPL(kvm_read_guest);
1341
1342 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1343 unsigned long len)
1344 {
1345 int r;
1346 unsigned long addr;
1347 gfn_t gfn = gpa >> PAGE_SHIFT;
1348 int offset = offset_in_page(gpa);
1349
1350 addr = gfn_to_hva(kvm, gfn);
1351 if (kvm_is_error_hva(addr))
1352 return -EFAULT;
1353 pagefault_disable();
1354 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1355 pagefault_enable();
1356 if (r)
1357 return -EFAULT;
1358 return 0;
1359 }
1360 EXPORT_SYMBOL(kvm_read_guest_atomic);
1361
1362 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1363 int offset, int len)
1364 {
1365 int r;
1366 unsigned long addr;
1367
1368 addr = gfn_to_hva(kvm, gfn);
1369 if (kvm_is_error_hva(addr))
1370 return -EFAULT;
1371 r = __copy_to_user((void __user *)addr + offset, data, len);
1372 if (r)
1373 return -EFAULT;
1374 mark_page_dirty(kvm, gfn);
1375 return 0;
1376 }
1377 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1378
1379 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1380 unsigned long len)
1381 {
1382 gfn_t gfn = gpa >> PAGE_SHIFT;
1383 int seg;
1384 int offset = offset_in_page(gpa);
1385 int ret;
1386
1387 while ((seg = next_segment(len, offset)) != 0) {
1388 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1389 if (ret < 0)
1390 return ret;
1391 offset = 0;
1392 len -= seg;
1393 data += seg;
1394 ++gfn;
1395 }
1396 return 0;
1397 }
1398
1399 int kvm_gfn_to_hva_cache_init(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1400 gpa_t gpa)
1401 {
1402 struct kvm_memslots *slots = kvm_memslots(kvm);
1403 int offset = offset_in_page(gpa);
1404 gfn_t gfn = gpa >> PAGE_SHIFT;
1405
1406 ghc->gpa = gpa;
1407 ghc->generation = slots->generation;
1408 ghc->memslot = __gfn_to_memslot(slots, gfn);
1409 ghc->hva = gfn_to_hva_many(ghc->memslot, gfn, NULL);
1410 if (!kvm_is_error_hva(ghc->hva))
1411 ghc->hva += offset;
1412 else
1413 return -EFAULT;
1414
1415 return 0;
1416 }
1417 EXPORT_SYMBOL_GPL(kvm_gfn_to_hva_cache_init);
1418
1419 int kvm_write_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1420 void *data, unsigned long len)
1421 {
1422 struct kvm_memslots *slots = kvm_memslots(kvm);
1423 int r;
1424
1425 if (slots->generation != ghc->generation)
1426 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1427
1428 if (kvm_is_error_hva(ghc->hva))
1429 return -EFAULT;
1430
1431 r = __copy_to_user((void __user *)ghc->hva, data, len);
1432 if (r)
1433 return -EFAULT;
1434 mark_page_dirty_in_slot(kvm, ghc->memslot, ghc->gpa >> PAGE_SHIFT);
1435
1436 return 0;
1437 }
1438 EXPORT_SYMBOL_GPL(kvm_write_guest_cached);
1439
1440 int kvm_read_guest_cached(struct kvm *kvm, struct gfn_to_hva_cache *ghc,
1441 void *data, unsigned long len)
1442 {
1443 struct kvm_memslots *slots = kvm_memslots(kvm);
1444 int r;
1445
1446 if (slots->generation != ghc->generation)
1447 kvm_gfn_to_hva_cache_init(kvm, ghc, ghc->gpa);
1448
1449 if (kvm_is_error_hva(ghc->hva))
1450 return -EFAULT;
1451
1452 r = __copy_from_user(data, (void __user *)ghc->hva, len);
1453 if (r)
1454 return -EFAULT;
1455
1456 return 0;
1457 }
1458 EXPORT_SYMBOL_GPL(kvm_read_guest_cached);
1459
1460 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1461 {
1462 return kvm_write_guest_page(kvm, gfn, (const void *) empty_zero_page,
1463 offset, len);
1464 }
1465 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1466
1467 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1468 {
1469 gfn_t gfn = gpa >> PAGE_SHIFT;
1470 int seg;
1471 int offset = offset_in_page(gpa);
1472 int ret;
1473
1474 while ((seg = next_segment(len, offset)) != 0) {
1475 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1476 if (ret < 0)
1477 return ret;
1478 offset = 0;
1479 len -= seg;
1480 ++gfn;
1481 }
1482 return 0;
1483 }
1484 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1485
1486 void mark_page_dirty_in_slot(struct kvm *kvm, struct kvm_memory_slot *memslot,
1487 gfn_t gfn)
1488 {
1489 if (memslot && memslot->dirty_bitmap) {
1490 unsigned long rel_gfn = gfn - memslot->base_gfn;
1491
1492 __set_bit_le(rel_gfn, memslot->dirty_bitmap);
1493 }
1494 }
1495
1496 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1497 {
1498 struct kvm_memory_slot *memslot;
1499
1500 memslot = gfn_to_memslot(kvm, gfn);
1501 mark_page_dirty_in_slot(kvm, memslot, gfn);
1502 }
1503
1504 /*
1505 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1506 */
1507 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1508 {
1509 DEFINE_WAIT(wait);
1510
1511 for (;;) {
1512 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1513
1514 if (kvm_arch_vcpu_runnable(vcpu)) {
1515 kvm_make_request(KVM_REQ_UNHALT, vcpu);
1516 break;
1517 }
1518 if (kvm_cpu_has_pending_timer(vcpu))
1519 break;
1520 if (signal_pending(current))
1521 break;
1522
1523 schedule();
1524 }
1525
1526 finish_wait(&vcpu->wq, &wait);
1527 }
1528
1529 void kvm_resched(struct kvm_vcpu *vcpu)
1530 {
1531 if (!need_resched())
1532 return;
1533 cond_resched();
1534 }
1535 EXPORT_SYMBOL_GPL(kvm_resched);
1536
1537 void kvm_vcpu_on_spin(struct kvm_vcpu *me)
1538 {
1539 struct kvm *kvm = me->kvm;
1540 struct kvm_vcpu *vcpu;
1541 int last_boosted_vcpu = me->kvm->last_boosted_vcpu;
1542 int yielded = 0;
1543 int pass;
1544 int i;
1545
1546 /*
1547 * We boost the priority of a VCPU that is runnable but not
1548 * currently running, because it got preempted by something
1549 * else and called schedule in __vcpu_run. Hopefully that
1550 * VCPU is holding the lock that we need and will release it.
1551 * We approximate round-robin by starting at the last boosted VCPU.
1552 */
1553 for (pass = 0; pass < 2 && !yielded; pass++) {
1554 kvm_for_each_vcpu(i, vcpu, kvm) {
1555 struct task_struct *task = NULL;
1556 struct pid *pid;
1557 if (!pass && i < last_boosted_vcpu) {
1558 i = last_boosted_vcpu;
1559 continue;
1560 } else if (pass && i > last_boosted_vcpu)
1561 break;
1562 if (vcpu == me)
1563 continue;
1564 if (waitqueue_active(&vcpu->wq))
1565 continue;
1566 rcu_read_lock();
1567 pid = rcu_dereference(vcpu->pid);
1568 if (pid)
1569 task = get_pid_task(vcpu->pid, PIDTYPE_PID);
1570 rcu_read_unlock();
1571 if (!task)
1572 continue;
1573 if (task->flags & PF_VCPU) {
1574 put_task_struct(task);
1575 continue;
1576 }
1577 if (yield_to(task, 1)) {
1578 put_task_struct(task);
1579 kvm->last_boosted_vcpu = i;
1580 yielded = 1;
1581 break;
1582 }
1583 put_task_struct(task);
1584 }
1585 }
1586 }
1587 EXPORT_SYMBOL_GPL(kvm_vcpu_on_spin);
1588
1589 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1590 {
1591 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1592 struct page *page;
1593
1594 if (vmf->pgoff == 0)
1595 page = virt_to_page(vcpu->run);
1596 #ifdef CONFIG_X86
1597 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1598 page = virt_to_page(vcpu->arch.pio_data);
1599 #endif
1600 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1601 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1602 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1603 #endif
1604 else
1605 return VM_FAULT_SIGBUS;
1606 get_page(page);
1607 vmf->page = page;
1608 return 0;
1609 }
1610
1611 static const struct vm_operations_struct kvm_vcpu_vm_ops = {
1612 .fault = kvm_vcpu_fault,
1613 };
1614
1615 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1616 {
1617 vma->vm_ops = &kvm_vcpu_vm_ops;
1618 return 0;
1619 }
1620
1621 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1622 {
1623 struct kvm_vcpu *vcpu = filp->private_data;
1624
1625 kvm_put_kvm(vcpu->kvm);
1626 return 0;
1627 }
1628
1629 static struct file_operations kvm_vcpu_fops = {
1630 .release = kvm_vcpu_release,
1631 .unlocked_ioctl = kvm_vcpu_ioctl,
1632 #ifdef CONFIG_COMPAT
1633 .compat_ioctl = kvm_vcpu_compat_ioctl,
1634 #endif
1635 .mmap = kvm_vcpu_mmap,
1636 .llseek = noop_llseek,
1637 };
1638
1639 /*
1640 * Allocates an inode for the vcpu.
1641 */
1642 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1643 {
1644 return anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, O_RDWR);
1645 }
1646
1647 /*
1648 * Creates some virtual cpus. Good luck creating more than one.
1649 */
1650 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, u32 id)
1651 {
1652 int r;
1653 struct kvm_vcpu *vcpu, *v;
1654
1655 vcpu = kvm_arch_vcpu_create(kvm, id);
1656 if (IS_ERR(vcpu))
1657 return PTR_ERR(vcpu);
1658
1659 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1660
1661 r = kvm_arch_vcpu_setup(vcpu);
1662 if (r)
1663 goto vcpu_destroy;
1664
1665 mutex_lock(&kvm->lock);
1666 if (atomic_read(&kvm->online_vcpus) == KVM_MAX_VCPUS) {
1667 r = -EINVAL;
1668 goto unlock_vcpu_destroy;
1669 }
1670
1671 kvm_for_each_vcpu(r, v, kvm)
1672 if (v->vcpu_id == id) {
1673 r = -EEXIST;
1674 goto unlock_vcpu_destroy;
1675 }
1676
1677 BUG_ON(kvm->vcpus[atomic_read(&kvm->online_vcpus)]);
1678
1679 /* Now it's all set up, let userspace reach it */
1680 kvm_get_kvm(kvm);
1681 r = create_vcpu_fd(vcpu);
1682 if (r < 0) {
1683 kvm_put_kvm(kvm);
1684 goto unlock_vcpu_destroy;
1685 }
1686
1687 kvm->vcpus[atomic_read(&kvm->online_vcpus)] = vcpu;
1688 smp_wmb();
1689 atomic_inc(&kvm->online_vcpus);
1690
1691 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
1692 if (kvm->bsp_vcpu_id == id)
1693 kvm->bsp_vcpu = vcpu;
1694 #endif
1695 mutex_unlock(&kvm->lock);
1696 return r;
1697
1698 unlock_vcpu_destroy:
1699 mutex_unlock(&kvm->lock);
1700 vcpu_destroy:
1701 kvm_arch_vcpu_destroy(vcpu);
1702 return r;
1703 }
1704
1705 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1706 {
1707 if (sigset) {
1708 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1709 vcpu->sigset_active = 1;
1710 vcpu->sigset = *sigset;
1711 } else
1712 vcpu->sigset_active = 0;
1713 return 0;
1714 }
1715
1716 static long kvm_vcpu_ioctl(struct file *filp,
1717 unsigned int ioctl, unsigned long arg)
1718 {
1719 struct kvm_vcpu *vcpu = filp->private_data;
1720 void __user *argp = (void __user *)arg;
1721 int r;
1722 struct kvm_fpu *fpu = NULL;
1723 struct kvm_sregs *kvm_sregs = NULL;
1724
1725 if (vcpu->kvm->mm != current->mm)
1726 return -EIO;
1727
1728 #if defined(CONFIG_S390) || defined(CONFIG_PPC)
1729 /*
1730 * Special cases: vcpu ioctls that are asynchronous to vcpu execution,
1731 * so vcpu_load() would break it.
1732 */
1733 if (ioctl == KVM_S390_INTERRUPT || ioctl == KVM_INTERRUPT)
1734 return kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1735 #endif
1736
1737
1738 vcpu_load(vcpu);
1739 switch (ioctl) {
1740 case KVM_RUN:
1741 r = -EINVAL;
1742 if (arg)
1743 goto out;
1744 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1745 trace_kvm_userspace_exit(vcpu->run->exit_reason, r);
1746 break;
1747 case KVM_GET_REGS: {
1748 struct kvm_regs *kvm_regs;
1749
1750 r = -ENOMEM;
1751 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1752 if (!kvm_regs)
1753 goto out;
1754 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1755 if (r)
1756 goto out_free1;
1757 r = -EFAULT;
1758 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1759 goto out_free1;
1760 r = 0;
1761 out_free1:
1762 kfree(kvm_regs);
1763 break;
1764 }
1765 case KVM_SET_REGS: {
1766 struct kvm_regs *kvm_regs;
1767
1768 r = -ENOMEM;
1769 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1770 if (!kvm_regs)
1771 goto out;
1772 r = -EFAULT;
1773 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1774 goto out_free2;
1775 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1776 if (r)
1777 goto out_free2;
1778 r = 0;
1779 out_free2:
1780 kfree(kvm_regs);
1781 break;
1782 }
1783 case KVM_GET_SREGS: {
1784 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1785 r = -ENOMEM;
1786 if (!kvm_sregs)
1787 goto out;
1788 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1789 if (r)
1790 goto out;
1791 r = -EFAULT;
1792 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1793 goto out;
1794 r = 0;
1795 break;
1796 }
1797 case KVM_SET_SREGS: {
1798 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1799 r = -ENOMEM;
1800 if (!kvm_sregs)
1801 goto out;
1802 r = -EFAULT;
1803 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1804 goto out;
1805 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1806 if (r)
1807 goto out;
1808 r = 0;
1809 break;
1810 }
1811 case KVM_GET_MP_STATE: {
1812 struct kvm_mp_state mp_state;
1813
1814 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1815 if (r)
1816 goto out;
1817 r = -EFAULT;
1818 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1819 goto out;
1820 r = 0;
1821 break;
1822 }
1823 case KVM_SET_MP_STATE: {
1824 struct kvm_mp_state mp_state;
1825
1826 r = -EFAULT;
1827 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1828 goto out;
1829 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1830 if (r)
1831 goto out;
1832 r = 0;
1833 break;
1834 }
1835 case KVM_TRANSLATE: {
1836 struct kvm_translation tr;
1837
1838 r = -EFAULT;
1839 if (copy_from_user(&tr, argp, sizeof tr))
1840 goto out;
1841 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1842 if (r)
1843 goto out;
1844 r = -EFAULT;
1845 if (copy_to_user(argp, &tr, sizeof tr))
1846 goto out;
1847 r = 0;
1848 break;
1849 }
1850 case KVM_SET_GUEST_DEBUG: {
1851 struct kvm_guest_debug dbg;
1852
1853 r = -EFAULT;
1854 if (copy_from_user(&dbg, argp, sizeof dbg))
1855 goto out;
1856 r = kvm_arch_vcpu_ioctl_set_guest_debug(vcpu, &dbg);
1857 if (r)
1858 goto out;
1859 r = 0;
1860 break;
1861 }
1862 case KVM_SET_SIGNAL_MASK: {
1863 struct kvm_signal_mask __user *sigmask_arg = argp;
1864 struct kvm_signal_mask kvm_sigmask;
1865 sigset_t sigset, *p;
1866
1867 p = NULL;
1868 if (argp) {
1869 r = -EFAULT;
1870 if (copy_from_user(&kvm_sigmask, argp,
1871 sizeof kvm_sigmask))
1872 goto out;
1873 r = -EINVAL;
1874 if (kvm_sigmask.len != sizeof sigset)
1875 goto out;
1876 r = -EFAULT;
1877 if (copy_from_user(&sigset, sigmask_arg->sigset,
1878 sizeof sigset))
1879 goto out;
1880 p = &sigset;
1881 }
1882 r = kvm_vcpu_ioctl_set_sigmask(vcpu, p);
1883 break;
1884 }
1885 case KVM_GET_FPU: {
1886 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1887 r = -ENOMEM;
1888 if (!fpu)
1889 goto out;
1890 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1891 if (r)
1892 goto out;
1893 r = -EFAULT;
1894 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1895 goto out;
1896 r = 0;
1897 break;
1898 }
1899 case KVM_SET_FPU: {
1900 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1901 r = -ENOMEM;
1902 if (!fpu)
1903 goto out;
1904 r = -EFAULT;
1905 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1906 goto out;
1907 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1908 if (r)
1909 goto out;
1910 r = 0;
1911 break;
1912 }
1913 default:
1914 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1915 }
1916 out:
1917 vcpu_put(vcpu);
1918 kfree(fpu);
1919 kfree(kvm_sregs);
1920 return r;
1921 }
1922
1923 #ifdef CONFIG_COMPAT
1924 static long kvm_vcpu_compat_ioctl(struct file *filp,
1925 unsigned int ioctl, unsigned long arg)
1926 {
1927 struct kvm_vcpu *vcpu = filp->private_data;
1928 void __user *argp = compat_ptr(arg);
1929 int r;
1930
1931 if (vcpu->kvm->mm != current->mm)
1932 return -EIO;
1933
1934 switch (ioctl) {
1935 case KVM_SET_SIGNAL_MASK: {
1936 struct kvm_signal_mask __user *sigmask_arg = argp;
1937 struct kvm_signal_mask kvm_sigmask;
1938 compat_sigset_t csigset;
1939 sigset_t sigset;
1940
1941 if (argp) {
1942 r = -EFAULT;
1943 if (copy_from_user(&kvm_sigmask, argp,
1944 sizeof kvm_sigmask))
1945 goto out;
1946 r = -EINVAL;
1947 if (kvm_sigmask.len != sizeof csigset)
1948 goto out;
1949 r = -EFAULT;
1950 if (copy_from_user(&csigset, sigmask_arg->sigset,
1951 sizeof csigset))
1952 goto out;
1953 }
1954 sigset_from_compat(&sigset, &csigset);
1955 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1956 break;
1957 }
1958 default:
1959 r = kvm_vcpu_ioctl(filp, ioctl, arg);
1960 }
1961
1962 out:
1963 return r;
1964 }
1965 #endif
1966
1967 static long kvm_vm_ioctl(struct file *filp,
1968 unsigned int ioctl, unsigned long arg)
1969 {
1970 struct kvm *kvm = filp->private_data;
1971 void __user *argp = (void __user *)arg;
1972 int r;
1973
1974 if (kvm->mm != current->mm)
1975 return -EIO;
1976 switch (ioctl) {
1977 case KVM_CREATE_VCPU:
1978 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1979 if (r < 0)
1980 goto out;
1981 break;
1982 case KVM_SET_USER_MEMORY_REGION: {
1983 struct kvm_userspace_memory_region kvm_userspace_mem;
1984
1985 r = -EFAULT;
1986 if (copy_from_user(&kvm_userspace_mem, argp,
1987 sizeof kvm_userspace_mem))
1988 goto out;
1989
1990 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1991 if (r)
1992 goto out;
1993 break;
1994 }
1995 case KVM_GET_DIRTY_LOG: {
1996 struct kvm_dirty_log log;
1997
1998 r = -EFAULT;
1999 if (copy_from_user(&log, argp, sizeof log))
2000 goto out;
2001 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2002 if (r)
2003 goto out;
2004 break;
2005 }
2006 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2007 case KVM_REGISTER_COALESCED_MMIO: {
2008 struct kvm_coalesced_mmio_zone zone;
2009 r = -EFAULT;
2010 if (copy_from_user(&zone, argp, sizeof zone))
2011 goto out;
2012 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
2013 if (r)
2014 goto out;
2015 r = 0;
2016 break;
2017 }
2018 case KVM_UNREGISTER_COALESCED_MMIO: {
2019 struct kvm_coalesced_mmio_zone zone;
2020 r = -EFAULT;
2021 if (copy_from_user(&zone, argp, sizeof zone))
2022 goto out;
2023 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
2024 if (r)
2025 goto out;
2026 r = 0;
2027 break;
2028 }
2029 #endif
2030 case KVM_IRQFD: {
2031 struct kvm_irqfd data;
2032
2033 r = -EFAULT;
2034 if (copy_from_user(&data, argp, sizeof data))
2035 goto out;
2036 r = kvm_irqfd(kvm, data.fd, data.gsi, data.flags);
2037 break;
2038 }
2039 case KVM_IOEVENTFD: {
2040 struct kvm_ioeventfd data;
2041
2042 r = -EFAULT;
2043 if (copy_from_user(&data, argp, sizeof data))
2044 goto out;
2045 r = kvm_ioeventfd(kvm, &data);
2046 break;
2047 }
2048 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2049 case KVM_SET_BOOT_CPU_ID:
2050 r = 0;
2051 mutex_lock(&kvm->lock);
2052 if (atomic_read(&kvm->online_vcpus) != 0)
2053 r = -EBUSY;
2054 else
2055 kvm->bsp_vcpu_id = arg;
2056 mutex_unlock(&kvm->lock);
2057 break;
2058 #endif
2059 default:
2060 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2061 if (r == -ENOTTY)
2062 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2063 }
2064 out:
2065 return r;
2066 }
2067
2068 #ifdef CONFIG_COMPAT
2069 struct compat_kvm_dirty_log {
2070 __u32 slot;
2071 __u32 padding1;
2072 union {
2073 compat_uptr_t dirty_bitmap; /* one bit per page */
2074 __u64 padding2;
2075 };
2076 };
2077
2078 static long kvm_vm_compat_ioctl(struct file *filp,
2079 unsigned int ioctl, unsigned long arg)
2080 {
2081 struct kvm *kvm = filp->private_data;
2082 int r;
2083
2084 if (kvm->mm != current->mm)
2085 return -EIO;
2086 switch (ioctl) {
2087 case KVM_GET_DIRTY_LOG: {
2088 struct compat_kvm_dirty_log compat_log;
2089 struct kvm_dirty_log log;
2090
2091 r = -EFAULT;
2092 if (copy_from_user(&compat_log, (void __user *)arg,
2093 sizeof(compat_log)))
2094 goto out;
2095 log.slot = compat_log.slot;
2096 log.padding1 = compat_log.padding1;
2097 log.padding2 = compat_log.padding2;
2098 log.dirty_bitmap = compat_ptr(compat_log.dirty_bitmap);
2099
2100 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
2101 if (r)
2102 goto out;
2103 break;
2104 }
2105 default:
2106 r = kvm_vm_ioctl(filp, ioctl, arg);
2107 }
2108
2109 out:
2110 return r;
2111 }
2112 #endif
2113
2114 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
2115 {
2116 struct page *page[1];
2117 unsigned long addr;
2118 int npages;
2119 gfn_t gfn = vmf->pgoff;
2120 struct kvm *kvm = vma->vm_file->private_data;
2121
2122 addr = gfn_to_hva(kvm, gfn);
2123 if (kvm_is_error_hva(addr))
2124 return VM_FAULT_SIGBUS;
2125
2126 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
2127 NULL);
2128 if (unlikely(npages != 1))
2129 return VM_FAULT_SIGBUS;
2130
2131 vmf->page = page[0];
2132 return 0;
2133 }
2134
2135 static const struct vm_operations_struct kvm_vm_vm_ops = {
2136 .fault = kvm_vm_fault,
2137 };
2138
2139 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
2140 {
2141 vma->vm_ops = &kvm_vm_vm_ops;
2142 return 0;
2143 }
2144
2145 static struct file_operations kvm_vm_fops = {
2146 .release = kvm_vm_release,
2147 .unlocked_ioctl = kvm_vm_ioctl,
2148 #ifdef CONFIG_COMPAT
2149 .compat_ioctl = kvm_vm_compat_ioctl,
2150 #endif
2151 .mmap = kvm_vm_mmap,
2152 .llseek = noop_llseek,
2153 };
2154
2155 static int kvm_dev_ioctl_create_vm(void)
2156 {
2157 int r;
2158 struct kvm *kvm;
2159
2160 kvm = kvm_create_vm();
2161 if (IS_ERR(kvm))
2162 return PTR_ERR(kvm);
2163 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2164 r = kvm_coalesced_mmio_init(kvm);
2165 if (r < 0) {
2166 kvm_put_kvm(kvm);
2167 return r;
2168 }
2169 #endif
2170 r = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, O_RDWR);
2171 if (r < 0)
2172 kvm_put_kvm(kvm);
2173
2174 return r;
2175 }
2176
2177 static long kvm_dev_ioctl_check_extension_generic(long arg)
2178 {
2179 switch (arg) {
2180 case KVM_CAP_USER_MEMORY:
2181 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
2182 case KVM_CAP_JOIN_MEMORY_REGIONS_WORKS:
2183 #ifdef CONFIG_KVM_APIC_ARCHITECTURE
2184 case KVM_CAP_SET_BOOT_CPU_ID:
2185 #endif
2186 case KVM_CAP_INTERNAL_ERROR_DATA:
2187 return 1;
2188 #ifdef CONFIG_HAVE_KVM_IRQCHIP
2189 case KVM_CAP_IRQ_ROUTING:
2190 return KVM_MAX_IRQ_ROUTES;
2191 #endif
2192 default:
2193 break;
2194 }
2195 return kvm_dev_ioctl_check_extension(arg);
2196 }
2197
2198 static long kvm_dev_ioctl(struct file *filp,
2199 unsigned int ioctl, unsigned long arg)
2200 {
2201 long r = -EINVAL;
2202
2203 switch (ioctl) {
2204 case KVM_GET_API_VERSION:
2205 r = -EINVAL;
2206 if (arg)
2207 goto out;
2208 r = KVM_API_VERSION;
2209 break;
2210 case KVM_CREATE_VM:
2211 r = -EINVAL;
2212 if (arg)
2213 goto out;
2214 r = kvm_dev_ioctl_create_vm();
2215 break;
2216 case KVM_CHECK_EXTENSION:
2217 r = kvm_dev_ioctl_check_extension_generic(arg);
2218 break;
2219 case KVM_GET_VCPU_MMAP_SIZE:
2220 r = -EINVAL;
2221 if (arg)
2222 goto out;
2223 r = PAGE_SIZE; /* struct kvm_run */
2224 #ifdef CONFIG_X86
2225 r += PAGE_SIZE; /* pio data page */
2226 #endif
2227 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2228 r += PAGE_SIZE; /* coalesced mmio ring page */
2229 #endif
2230 break;
2231 case KVM_TRACE_ENABLE:
2232 case KVM_TRACE_PAUSE:
2233 case KVM_TRACE_DISABLE:
2234 r = -EOPNOTSUPP;
2235 break;
2236 default:
2237 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2238 }
2239 out:
2240 return r;
2241 }
2242
2243 static struct file_operations kvm_chardev_ops = {
2244 .unlocked_ioctl = kvm_dev_ioctl,
2245 .compat_ioctl = kvm_dev_ioctl,
2246 .llseek = noop_llseek,
2247 };
2248
2249 static struct miscdevice kvm_dev = {
2250 KVM_MINOR,
2251 "kvm",
2252 &kvm_chardev_ops,
2253 };
2254
2255 static void hardware_enable_nolock(void *junk)
2256 {
2257 int cpu = raw_smp_processor_id();
2258 int r;
2259
2260 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2261 return;
2262
2263 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2264
2265 r = kvm_arch_hardware_enable(NULL);
2266
2267 if (r) {
2268 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2269 atomic_inc(&hardware_enable_failed);
2270 printk(KERN_INFO "kvm: enabling virtualization on "
2271 "CPU%d failed\n", cpu);
2272 }
2273 }
2274
2275 static void hardware_enable(void *junk)
2276 {
2277 raw_spin_lock(&kvm_lock);
2278 hardware_enable_nolock(junk);
2279 raw_spin_unlock(&kvm_lock);
2280 }
2281
2282 static void hardware_disable_nolock(void *junk)
2283 {
2284 int cpu = raw_smp_processor_id();
2285
2286 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2287 return;
2288 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2289 kvm_arch_hardware_disable(NULL);
2290 }
2291
2292 static void hardware_disable(void *junk)
2293 {
2294 raw_spin_lock(&kvm_lock);
2295 hardware_disable_nolock(junk);
2296 raw_spin_unlock(&kvm_lock);
2297 }
2298
2299 static void hardware_disable_all_nolock(void)
2300 {
2301 BUG_ON(!kvm_usage_count);
2302
2303 kvm_usage_count--;
2304 if (!kvm_usage_count)
2305 on_each_cpu(hardware_disable_nolock, NULL, 1);
2306 }
2307
2308 static void hardware_disable_all(void)
2309 {
2310 raw_spin_lock(&kvm_lock);
2311 hardware_disable_all_nolock();
2312 raw_spin_unlock(&kvm_lock);
2313 }
2314
2315 static int hardware_enable_all(void)
2316 {
2317 int r = 0;
2318
2319 raw_spin_lock(&kvm_lock);
2320
2321 kvm_usage_count++;
2322 if (kvm_usage_count == 1) {
2323 atomic_set(&hardware_enable_failed, 0);
2324 on_each_cpu(hardware_enable_nolock, NULL, 1);
2325
2326 if (atomic_read(&hardware_enable_failed)) {
2327 hardware_disable_all_nolock();
2328 r = -EBUSY;
2329 }
2330 }
2331
2332 raw_spin_unlock(&kvm_lock);
2333
2334 return r;
2335 }
2336
2337 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2338 void *v)
2339 {
2340 int cpu = (long)v;
2341
2342 if (!kvm_usage_count)
2343 return NOTIFY_OK;
2344
2345 val &= ~CPU_TASKS_FROZEN;
2346 switch (val) {
2347 case CPU_DYING:
2348 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2349 cpu);
2350 hardware_disable(NULL);
2351 break;
2352 case CPU_STARTING:
2353 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2354 cpu);
2355 hardware_enable(NULL);
2356 break;
2357 }
2358 return NOTIFY_OK;
2359 }
2360
2361
2362 asmlinkage void kvm_spurious_fault(void)
2363 {
2364 /* Fault while not rebooting. We want the trace. */
2365 BUG();
2366 }
2367 EXPORT_SYMBOL_GPL(kvm_spurious_fault);
2368
2369 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2370 void *v)
2371 {
2372 /*
2373 * Some (well, at least mine) BIOSes hang on reboot if
2374 * in vmx root mode.
2375 *
2376 * And Intel TXT required VMX off for all cpu when system shutdown.
2377 */
2378 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2379 kvm_rebooting = true;
2380 on_each_cpu(hardware_disable_nolock, NULL, 1);
2381 return NOTIFY_OK;
2382 }
2383
2384 static struct notifier_block kvm_reboot_notifier = {
2385 .notifier_call = kvm_reboot,
2386 .priority = 0,
2387 };
2388
2389 static void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2390 {
2391 int i;
2392
2393 for (i = 0; i < bus->dev_count; i++) {
2394 struct kvm_io_device *pos = bus->devs[i];
2395
2396 kvm_iodevice_destructor(pos);
2397 }
2398 kfree(bus);
2399 }
2400
2401 /* kvm_io_bus_write - called under kvm->slots_lock */
2402 int kvm_io_bus_write(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2403 int len, const void *val)
2404 {
2405 int i;
2406 struct kvm_io_bus *bus;
2407
2408 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2409 for (i = 0; i < bus->dev_count; i++)
2410 if (!kvm_iodevice_write(bus->devs[i], addr, len, val))
2411 return 0;
2412 return -EOPNOTSUPP;
2413 }
2414
2415 /* kvm_io_bus_read - called under kvm->slots_lock */
2416 int kvm_io_bus_read(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
2417 int len, void *val)
2418 {
2419 int i;
2420 struct kvm_io_bus *bus;
2421
2422 bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);
2423 for (i = 0; i < bus->dev_count; i++)
2424 if (!kvm_iodevice_read(bus->devs[i], addr, len, val))
2425 return 0;
2426 return -EOPNOTSUPP;
2427 }
2428
2429 /* Caller must hold slots_lock. */
2430 int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2431 struct kvm_io_device *dev)
2432 {
2433 struct kvm_io_bus *new_bus, *bus;
2434
2435 bus = kvm->buses[bus_idx];
2436 if (bus->dev_count > NR_IOBUS_DEVS-1)
2437 return -ENOSPC;
2438
2439 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2440 if (!new_bus)
2441 return -ENOMEM;
2442 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2443 new_bus->devs[new_bus->dev_count++] = dev;
2444 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2445 synchronize_srcu_expedited(&kvm->srcu);
2446 kfree(bus);
2447
2448 return 0;
2449 }
2450
2451 /* Caller must hold slots_lock. */
2452 int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
2453 struct kvm_io_device *dev)
2454 {
2455 int i, r;
2456 struct kvm_io_bus *new_bus, *bus;
2457
2458 new_bus = kzalloc(sizeof(struct kvm_io_bus), GFP_KERNEL);
2459 if (!new_bus)
2460 return -ENOMEM;
2461
2462 bus = kvm->buses[bus_idx];
2463 memcpy(new_bus, bus, sizeof(struct kvm_io_bus));
2464
2465 r = -ENOENT;
2466 for (i = 0; i < new_bus->dev_count; i++)
2467 if (new_bus->devs[i] == dev) {
2468 r = 0;
2469 new_bus->devs[i] = new_bus->devs[--new_bus->dev_count];
2470 break;
2471 }
2472
2473 if (r) {
2474 kfree(new_bus);
2475 return r;
2476 }
2477
2478 rcu_assign_pointer(kvm->buses[bus_idx], new_bus);
2479 synchronize_srcu_expedited(&kvm->srcu);
2480 kfree(bus);
2481 return r;
2482 }
2483
2484 static struct notifier_block kvm_cpu_notifier = {
2485 .notifier_call = kvm_cpu_hotplug,
2486 };
2487
2488 static int vm_stat_get(void *_offset, u64 *val)
2489 {
2490 unsigned offset = (long)_offset;
2491 struct kvm *kvm;
2492
2493 *val = 0;
2494 raw_spin_lock(&kvm_lock);
2495 list_for_each_entry(kvm, &vm_list, vm_list)
2496 *val += *(u32 *)((void *)kvm + offset);
2497 raw_spin_unlock(&kvm_lock);
2498 return 0;
2499 }
2500
2501 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2502
2503 static int vcpu_stat_get(void *_offset, u64 *val)
2504 {
2505 unsigned offset = (long)_offset;
2506 struct kvm *kvm;
2507 struct kvm_vcpu *vcpu;
2508 int i;
2509
2510 *val = 0;
2511 raw_spin_lock(&kvm_lock);
2512 list_for_each_entry(kvm, &vm_list, vm_list)
2513 kvm_for_each_vcpu(i, vcpu, kvm)
2514 *val += *(u32 *)((void *)vcpu + offset);
2515
2516 raw_spin_unlock(&kvm_lock);
2517 return 0;
2518 }
2519
2520 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2521
2522 static const struct file_operations *stat_fops[] = {
2523 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2524 [KVM_STAT_VM] = &vm_stat_fops,
2525 };
2526
2527 static void kvm_init_debug(void)
2528 {
2529 struct kvm_stats_debugfs_item *p;
2530
2531 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2532 for (p = debugfs_entries; p->name; ++p)
2533 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2534 (void *)(long)p->offset,
2535 stat_fops[p->kind]);
2536 }
2537
2538 static void kvm_exit_debug(void)
2539 {
2540 struct kvm_stats_debugfs_item *p;
2541
2542 for (p = debugfs_entries; p->name; ++p)
2543 debugfs_remove(p->dentry);
2544 debugfs_remove(kvm_debugfs_dir);
2545 }
2546
2547 static int kvm_suspend(void)
2548 {
2549 if (kvm_usage_count)
2550 hardware_disable_nolock(NULL);
2551 return 0;
2552 }
2553
2554 static void kvm_resume(void)
2555 {
2556 if (kvm_usage_count) {
2557 WARN_ON(raw_spin_is_locked(&kvm_lock));
2558 hardware_enable_nolock(NULL);
2559 }
2560 }
2561
2562 static struct syscore_ops kvm_syscore_ops = {
2563 .suspend = kvm_suspend,
2564 .resume = kvm_resume,
2565 };
2566
2567 struct page *bad_page;
2568 pfn_t bad_pfn;
2569
2570 static inline
2571 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2572 {
2573 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2574 }
2575
2576 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2577 {
2578 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2579
2580 kvm_arch_vcpu_load(vcpu, cpu);
2581 }
2582
2583 static void kvm_sched_out(struct preempt_notifier *pn,
2584 struct task_struct *next)
2585 {
2586 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2587
2588 kvm_arch_vcpu_put(vcpu);
2589 }
2590
2591 int kvm_init(void *opaque, unsigned vcpu_size, unsigned vcpu_align,
2592 struct module *module)
2593 {
2594 int r;
2595 int cpu;
2596
2597 r = kvm_arch_init(opaque);
2598 if (r)
2599 goto out_fail;
2600
2601 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2602
2603 if (bad_page == NULL) {
2604 r = -ENOMEM;
2605 goto out;
2606 }
2607
2608 bad_pfn = page_to_pfn(bad_page);
2609
2610 hwpoison_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2611
2612 if (hwpoison_page == NULL) {
2613 r = -ENOMEM;
2614 goto out_free_0;
2615 }
2616
2617 hwpoison_pfn = page_to_pfn(hwpoison_page);
2618
2619 fault_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2620
2621 if (fault_page == NULL) {
2622 r = -ENOMEM;
2623 goto out_free_0;
2624 }
2625
2626 fault_pfn = page_to_pfn(fault_page);
2627
2628 if (!zalloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2629 r = -ENOMEM;
2630 goto out_free_0;
2631 }
2632
2633 r = kvm_arch_hardware_setup();
2634 if (r < 0)
2635 goto out_free_0a;
2636
2637 for_each_online_cpu(cpu) {
2638 smp_call_function_single(cpu,
2639 kvm_arch_check_processor_compat,
2640 &r, 1);
2641 if (r < 0)
2642 goto out_free_1;
2643 }
2644
2645 r = register_cpu_notifier(&kvm_cpu_notifier);
2646 if (r)
2647 goto out_free_2;
2648 register_reboot_notifier(&kvm_reboot_notifier);
2649
2650 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2651 if (!vcpu_align)
2652 vcpu_align = __alignof__(struct kvm_vcpu);
2653 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size, vcpu_align,
2654 0, NULL);
2655 if (!kvm_vcpu_cache) {
2656 r = -ENOMEM;
2657 goto out_free_3;
2658 }
2659
2660 r = kvm_async_pf_init();
2661 if (r)
2662 goto out_free;
2663
2664 kvm_chardev_ops.owner = module;
2665 kvm_vm_fops.owner = module;
2666 kvm_vcpu_fops.owner = module;
2667
2668 r = misc_register(&kvm_dev);
2669 if (r) {
2670 printk(KERN_ERR "kvm: misc device register failed\n");
2671 goto out_unreg;
2672 }
2673
2674 register_syscore_ops(&kvm_syscore_ops);
2675
2676 kvm_preempt_ops.sched_in = kvm_sched_in;
2677 kvm_preempt_ops.sched_out = kvm_sched_out;
2678
2679 kvm_init_debug();
2680
2681 return 0;
2682
2683 out_unreg:
2684 kvm_async_pf_deinit();
2685 out_free:
2686 kmem_cache_destroy(kvm_vcpu_cache);
2687 out_free_3:
2688 unregister_reboot_notifier(&kvm_reboot_notifier);
2689 unregister_cpu_notifier(&kvm_cpu_notifier);
2690 out_free_2:
2691 out_free_1:
2692 kvm_arch_hardware_unsetup();
2693 out_free_0a:
2694 free_cpumask_var(cpus_hardware_enabled);
2695 out_free_0:
2696 if (fault_page)
2697 __free_page(fault_page);
2698 if (hwpoison_page)
2699 __free_page(hwpoison_page);
2700 __free_page(bad_page);
2701 out:
2702 kvm_arch_exit();
2703 out_fail:
2704 return r;
2705 }
2706 EXPORT_SYMBOL_GPL(kvm_init);
2707
2708 void kvm_exit(void)
2709 {
2710 kvm_exit_debug();
2711 misc_deregister(&kvm_dev);
2712 kmem_cache_destroy(kvm_vcpu_cache);
2713 kvm_async_pf_deinit();
2714 unregister_syscore_ops(&kvm_syscore_ops);
2715 unregister_reboot_notifier(&kvm_reboot_notifier);
2716 unregister_cpu_notifier(&kvm_cpu_notifier);
2717 on_each_cpu(hardware_disable_nolock, NULL, 1);
2718 kvm_arch_hardware_unsetup();
2719 kvm_arch_exit();
2720 free_cpumask_var(cpus_hardware_enabled);
2721 __free_page(hwpoison_page);
2722 __free_page(bad_page);
2723 }
2724 EXPORT_SYMBOL_GPL(kvm_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree