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partial revert of asynchronous inode delete
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / virt / kvm / kvm_main.c
blob3a5a08298aabd1a06c770c2cf4c2b657fae0af14
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 *
9 * Authors:
10 * Avi Kivity <avi@qumranet.com>
11 * Yaniv Kamay <yaniv@qumranet.com>
12 *
13 * This work is licensed under the terms of the GNU GPL, version 2. See
14 * the COPYING file in the top-level directory.
15 *
16 */
17
18 #include "iodev.h"
19
20 #include <linux/kvm_host.h>
21 #include <linux/kvm.h>
22 #include <linux/module.h>
23 #include <linux/errno.h>
24 #include <linux/percpu.h>
25 #include <linux/gfp.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/sysdev.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
45 #include <asm/processor.h>
46 #include <asm/io.h>
47 #include <asm/uaccess.h>
48 #include <asm/pgtable.h>
49
50 #ifdef CONFIG_X86
51 #include <asm/msidef.h>
52 #endif
53
54 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
55 #include "coalesced_mmio.h"
56 #endif
57
58 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
59 #include <linux/pci.h>
60 #include <linux/interrupt.h>
61 #include "irq.h"
62 #endif
63
64 MODULE_AUTHOR("Qumranet");
65 MODULE_LICENSE("GPL");
66
67 static int msi2intx = 1;
68 module_param(msi2intx, bool, 0);
69
70 DEFINE_SPINLOCK(kvm_lock);
71 LIST_HEAD(vm_list);
72
73 static cpumask_var_t cpus_hardware_enabled;
74
75 struct kmem_cache *kvm_vcpu_cache;
76 EXPORT_SYMBOL_GPL(kvm_vcpu_cache);
77
78 static __read_mostly struct preempt_ops kvm_preempt_ops;
79
80 struct dentry *kvm_debugfs_dir;
81
82 static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
83 unsigned long arg);
84
85 static bool kvm_rebooting;
86
87 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
88
89 #ifdef CONFIG_X86
90 static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev)
91 {
92 int vcpu_id;
93 struct kvm_vcpu *vcpu;
94 struct kvm_ioapic *ioapic = ioapic_irqchip(dev->kvm);
95 int dest_id = (dev->guest_msi.address_lo & MSI_ADDR_DEST_ID_MASK)
96 >> MSI_ADDR_DEST_ID_SHIFT;
97 int vector = (dev->guest_msi.data & MSI_DATA_VECTOR_MASK)
98 >> MSI_DATA_VECTOR_SHIFT;
99 int dest_mode = test_bit(MSI_ADDR_DEST_MODE_SHIFT,
100 (unsigned long *)&dev->guest_msi.address_lo);
101 int trig_mode = test_bit(MSI_DATA_TRIGGER_SHIFT,
102 (unsigned long *)&dev->guest_msi.data);
103 int delivery_mode = test_bit(MSI_DATA_DELIVERY_MODE_SHIFT,
104 (unsigned long *)&dev->guest_msi.data);
105 u32 deliver_bitmask;
106
107 BUG_ON(!ioapic);
108
109 deliver_bitmask = kvm_ioapic_get_delivery_bitmask(ioapic,
110 dest_id, dest_mode);
111 /* IOAPIC delivery mode value is the same as MSI here */
112 switch (delivery_mode) {
113 case IOAPIC_LOWEST_PRIORITY:
114 vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, vector,
115 deliver_bitmask);
116 if (vcpu != NULL)
117 kvm_apic_set_irq(vcpu, vector, trig_mode);
118 else
119 printk(KERN_INFO "kvm: null lowest priority vcpu!\n");
120 break;
121 case IOAPIC_FIXED:
122 for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) {
123 if (!(deliver_bitmask & (1 << vcpu_id)))
124 continue;
125 deliver_bitmask &= ~(1 << vcpu_id);
126 vcpu = ioapic->kvm->vcpus[vcpu_id];
127 if (vcpu)
128 kvm_apic_set_irq(vcpu, vector, trig_mode);
129 }
130 break;
131 default:
132 printk(KERN_INFO "kvm: unsupported MSI delivery mode\n");
133 }
134 }
135 #else
136 static void assigned_device_msi_dispatch(struct kvm_assigned_dev_kernel *dev) {}
137 #endif
138
139 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
140 int assigned_dev_id)
141 {
142 struct list_head *ptr;
143 struct kvm_assigned_dev_kernel *match;
144
145 list_for_each(ptr, head) {
146 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
147 if (match->assigned_dev_id == assigned_dev_id)
148 return match;
149 }
150 return NULL;
151 }
152
153 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
154 {
155 struct kvm_assigned_dev_kernel *assigned_dev;
156
157 assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
158 interrupt_work);
159
160 /* This is taken to safely inject irq inside the guest. When
161 * the interrupt injection (or the ioapic code) uses a
162 * finer-grained lock, update this
163 */
164 mutex_lock(&assigned_dev->kvm->lock);
165 if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_GUEST_INTX)
166 kvm_set_irq(assigned_dev->kvm,
167 assigned_dev->irq_source_id,
168 assigned_dev->guest_irq, 1);
169 else if (assigned_dev->irq_requested_type &
170 KVM_ASSIGNED_DEV_GUEST_MSI) {
171 assigned_device_msi_dispatch(assigned_dev);
172 enable_irq(assigned_dev->host_irq);
173 assigned_dev->host_irq_disabled = false;
174 }
175 mutex_unlock(&assigned_dev->kvm->lock);
176 kvm_put_kvm(assigned_dev->kvm);
177 }
178
179 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
180 {
181 struct kvm_assigned_dev_kernel *assigned_dev =
182 (struct kvm_assigned_dev_kernel *) dev_id;
183
184 kvm_get_kvm(assigned_dev->kvm);
185
186 schedule_work(&assigned_dev->interrupt_work);
187
188 disable_irq_nosync(irq);
189 assigned_dev->host_irq_disabled = true;
190
191 return IRQ_HANDLED;
192 }
193
194 /* Ack the irq line for an assigned device */
195 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
196 {
197 struct kvm_assigned_dev_kernel *dev;
198
199 if (kian->gsi == -1)
200 return;
201
202 dev = container_of(kian, struct kvm_assigned_dev_kernel,
203 ack_notifier);
204
205 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
206
207 /* The guest irq may be shared so this ack may be
208 * from another device.
209 */
210 if (dev->host_irq_disabled) {
211 enable_irq(dev->host_irq);
212 dev->host_irq_disabled = false;
213 }
214 }
215
216 static void kvm_free_assigned_irq(struct kvm *kvm,
217 struct kvm_assigned_dev_kernel *assigned_dev)
218 {
219 if (!irqchip_in_kernel(kvm))
220 return;
221
222 kvm_unregister_irq_ack_notifier(&assigned_dev->ack_notifier);
223
224 if (assigned_dev->irq_source_id != -1)
225 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
226 assigned_dev->irq_source_id = -1;
227
228 if (!assigned_dev->irq_requested_type)
229 return;
230
231 if (cancel_work_sync(&assigned_dev->interrupt_work))
232 /* We had pending work. That means we will have to take
233 * care of kvm_put_kvm.
234 */
235 kvm_put_kvm(kvm);
236
237 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
238
239 if (assigned_dev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
240 pci_disable_msi(assigned_dev->dev);
241
242 assigned_dev->irq_requested_type = 0;
243 }
244
245
246 static void kvm_free_assigned_device(struct kvm *kvm,
247 struct kvm_assigned_dev_kernel
248 *assigned_dev)
249 {
250 kvm_free_assigned_irq(kvm, assigned_dev);
251
252 pci_reset_function(assigned_dev->dev);
253
254 pci_release_regions(assigned_dev->dev);
255 pci_disable_device(assigned_dev->dev);
256 pci_dev_put(assigned_dev->dev);
257
258 list_del(&assigned_dev->list);
259 kfree(assigned_dev);
260 }
261
262 void kvm_free_all_assigned_devices(struct kvm *kvm)
263 {
264 struct list_head *ptr, *ptr2;
265 struct kvm_assigned_dev_kernel *assigned_dev;
266
267 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
268 assigned_dev = list_entry(ptr,
269 struct kvm_assigned_dev_kernel,
270 list);
271
272 kvm_free_assigned_device(kvm, assigned_dev);
273 }
274 }
275
276 static int assigned_device_update_intx(struct kvm *kvm,
277 struct kvm_assigned_dev_kernel *adev,
278 struct kvm_assigned_irq *airq)
279 {
280 adev->guest_irq = airq->guest_irq;
281 adev->ack_notifier.gsi = airq->guest_irq;
282
283 if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_INTX)
284 return 0;
285
286 if (irqchip_in_kernel(kvm)) {
287 if (!msi2intx &&
288 adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI) {
289 free_irq(adev->host_irq, (void *)kvm);
290 pci_disable_msi(adev->dev);
291 }
292
293 if (!capable(CAP_SYS_RAWIO))
294 return -EPERM;
295
296 if (airq->host_irq)
297 adev->host_irq = airq->host_irq;
298 else
299 adev->host_irq = adev->dev->irq;
300
301 /* Even though this is PCI, we don't want to use shared
302 * interrupts. Sharing host devices with guest-assigned devices
303 * on the same interrupt line is not a happy situation: there
304 * are going to be long delays in accepting, acking, etc.
305 */
306 if (request_irq(adev->host_irq, kvm_assigned_dev_intr,
307 0, "kvm_assigned_intx_device", (void *)adev))
308 return -EIO;
309 }
310
311 adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_INTX |
312 KVM_ASSIGNED_DEV_HOST_INTX;
313 return 0;
314 }
315
316 #ifdef CONFIG_X86
317 static int assigned_device_update_msi(struct kvm *kvm,
318 struct kvm_assigned_dev_kernel *adev,
319 struct kvm_assigned_irq *airq)
320 {
321 int r;
322
323 if (airq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI) {
324 /* x86 don't care upper address of guest msi message addr */
325 adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_MSI;
326 adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_INTX;
327 adev->guest_msi.address_lo = airq->guest_msi.addr_lo;
328 adev->guest_msi.data = airq->guest_msi.data;
329 adev->ack_notifier.gsi = -1;
330 } else if (msi2intx) {
331 adev->irq_requested_type |= KVM_ASSIGNED_DEV_GUEST_INTX;
332 adev->irq_requested_type &= ~KVM_ASSIGNED_DEV_GUEST_MSI;
333 adev->guest_irq = airq->guest_irq;
334 adev->ack_notifier.gsi = airq->guest_irq;
335 }
336
337 if (adev->irq_requested_type & KVM_ASSIGNED_DEV_HOST_MSI)
338 return 0;
339
340 if (irqchip_in_kernel(kvm)) {
341 if (!msi2intx) {
342 if (adev->irq_requested_type &
343 KVM_ASSIGNED_DEV_HOST_INTX)
344 free_irq(adev->host_irq, (void *)adev);
345
346 r = pci_enable_msi(adev->dev);
347 if (r)
348 return r;
349 }
350
351 adev->host_irq = adev->dev->irq;
352 if (request_irq(adev->host_irq, kvm_assigned_dev_intr, 0,
353 "kvm_assigned_msi_device", (void *)adev))
354 return -EIO;
355 }
356
357 if (!msi2intx)
358 adev->irq_requested_type = KVM_ASSIGNED_DEV_GUEST_MSI;
359
360 adev->irq_requested_type |= KVM_ASSIGNED_DEV_HOST_MSI;
361 return 0;
362 }
363 #endif
364
365 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
366 struct kvm_assigned_irq
367 *assigned_irq)
368 {
369 int r = 0;
370 struct kvm_assigned_dev_kernel *match;
371
372 mutex_lock(&kvm->lock);
373
374 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
375 assigned_irq->assigned_dev_id);
376 if (!match) {
377 mutex_unlock(&kvm->lock);
378 return -EINVAL;
379 }
380
381 if (!match->irq_requested_type) {
382 INIT_WORK(&match->interrupt_work,
383 kvm_assigned_dev_interrupt_work_handler);
384 if (irqchip_in_kernel(kvm)) {
385 /* Register ack nofitier */
386 match->ack_notifier.gsi = -1;
387 match->ack_notifier.irq_acked =
388 kvm_assigned_dev_ack_irq;
389 kvm_register_irq_ack_notifier(kvm,
390 &match->ack_notifier);
391
392 /* Request IRQ source ID */
393 r = kvm_request_irq_source_id(kvm);
394 if (r < 0)
395 goto out_release;
396 else
397 match->irq_source_id = r;
398
399 #ifdef CONFIG_X86
400 /* Determine host device irq type, we can know the
401 * result from dev->msi_enabled */
402 if (msi2intx)
403 pci_enable_msi(match->dev);
404 #endif
405 }
406 }
407
408 if ((!msi2intx &&
409 (assigned_irq->flags & KVM_DEV_IRQ_ASSIGN_ENABLE_MSI)) ||
410 (msi2intx && match->dev->msi_enabled)) {
411 #ifdef CONFIG_X86
412 r = assigned_device_update_msi(kvm, match, assigned_irq);
413 if (r) {
414 printk(KERN_WARNING "kvm: failed to enable "
415 "MSI device!\n");
416 goto out_release;
417 }
418 #else
419 r = -ENOTTY;
420 #endif
421 } else if (assigned_irq->host_irq == 0 && match->dev->irq == 0) {
422 /* Host device IRQ 0 means don't support INTx */
423 if (!msi2intx) {
424 printk(KERN_WARNING
425 "kvm: wait device to enable MSI!\n");
426 r = 0;
427 } else {
428 printk(KERN_WARNING
429 "kvm: failed to enable MSI device!\n");
430 r = -ENOTTY;
431 goto out_release;
432 }
433 } else {
434 /* Non-sharing INTx mode */
435 r = assigned_device_update_intx(kvm, match, assigned_irq);
436 if (r) {
437 printk(KERN_WARNING "kvm: failed to enable "
438 "INTx device!\n");
439 goto out_release;
440 }
441 }
442
443 mutex_unlock(&kvm->lock);
444 return r;
445 out_release:
446 mutex_unlock(&kvm->lock);
447 kvm_free_assigned_device(kvm, match);
448 return r;
449 }
450
451 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
452 struct kvm_assigned_pci_dev *assigned_dev)
453 {
454 int r = 0;
455 struct kvm_assigned_dev_kernel *match;
456 struct pci_dev *dev;
457
458 mutex_lock(&kvm->lock);
459
460 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
461 assigned_dev->assigned_dev_id);
462 if (match) {
463 /* device already assigned */
464 r = -EINVAL;
465 goto out;
466 }
467
468 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
469 if (match == NULL) {
470 printk(KERN_INFO "%s: Couldn't allocate memory\n",
471 __func__);
472 r = -ENOMEM;
473 goto out;
474 }
475 dev = pci_get_bus_and_slot(assigned_dev->busnr,
476 assigned_dev->devfn);
477 if (!dev) {
478 printk(KERN_INFO "%s: host device not found\n", __func__);
479 r = -EINVAL;
480 goto out_free;
481 }
482 if (pci_enable_device(dev)) {
483 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
484 r = -EBUSY;
485 goto out_put;
486 }
487 r = pci_request_regions(dev, "kvm_assigned_device");
488 if (r) {
489 printk(KERN_INFO "%s: Could not get access to device regions\n",
490 __func__);
491 goto out_disable;
492 }
493
494 pci_reset_function(dev);
495
496 match->assigned_dev_id = assigned_dev->assigned_dev_id;
497 match->host_busnr = assigned_dev->busnr;
498 match->host_devfn = assigned_dev->devfn;
499 match->flags = assigned_dev->flags;
500 match->dev = dev;
501 match->irq_source_id = -1;
502 match->kvm = kvm;
503
504 list_add(&match->list, &kvm->arch.assigned_dev_head);
505
506 if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
507 if (!kvm->arch.iommu_domain) {
508 r = kvm_iommu_map_guest(kvm);
509 if (r)
510 goto out_list_del;
511 }
512 r = kvm_assign_device(kvm, match);
513 if (r)
514 goto out_list_del;
515 }
516
517 out:
518 mutex_unlock(&kvm->lock);
519 return r;
520 out_list_del:
521 list_del(&match->list);
522 pci_release_regions(dev);
523 out_disable:
524 pci_disable_device(dev);
525 out_put:
526 pci_dev_put(dev);
527 out_free:
528 kfree(match);
529 mutex_unlock(&kvm->lock);
530 return r;
531 }
532 #endif
533
534 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
535 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
536 struct kvm_assigned_pci_dev *assigned_dev)
537 {
538 int r = 0;
539 struct kvm_assigned_dev_kernel *match;
540
541 mutex_lock(&kvm->lock);
542
543 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
544 assigned_dev->assigned_dev_id);
545 if (!match) {
546 printk(KERN_INFO "%s: device hasn't been assigned before, "
547 "so cannot be deassigned\n", __func__);
548 r = -EINVAL;
549 goto out;
550 }
551
552 if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
553 kvm_deassign_device(kvm, match);
554
555 kvm_free_assigned_device(kvm, match);
556
557 out:
558 mutex_unlock(&kvm->lock);
559 return r;
560 }
561 #endif
562
563 static inline int valid_vcpu(int n)
564 {
565 return likely(n >= 0 && n < KVM_MAX_VCPUS);
566 }
567
568 inline int kvm_is_mmio_pfn(pfn_t pfn)
569 {
570 if (pfn_valid(pfn))
571 return PageReserved(pfn_to_page(pfn));
572
573 return true;
574 }
575
576 /*
577 * Switches to specified vcpu, until a matching vcpu_put()
578 */
579 void vcpu_load(struct kvm_vcpu *vcpu)
580 {
581 int cpu;
582
583 mutex_lock(&vcpu->mutex);
584 cpu = get_cpu();
585 preempt_notifier_register(&vcpu->preempt_notifier);
586 kvm_arch_vcpu_load(vcpu, cpu);
587 put_cpu();
588 }
589
590 void vcpu_put(struct kvm_vcpu *vcpu)
591 {
592 preempt_disable();
593 kvm_arch_vcpu_put(vcpu);
594 preempt_notifier_unregister(&vcpu->preempt_notifier);
595 preempt_enable();
596 mutex_unlock(&vcpu->mutex);
597 }
598
599 static void ack_flush(void *_completed)
600 {
601 }
602
603 static bool make_all_cpus_request(struct kvm *kvm, unsigned int req)
604 {
605 int i, cpu, me;
606 cpumask_var_t cpus;
607 bool called = true;
608 struct kvm_vcpu *vcpu;
609
610 if (alloc_cpumask_var(&cpus, GFP_ATOMIC))
611 cpumask_clear(cpus);
612
613 me = get_cpu();
614 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
615 vcpu = kvm->vcpus[i];
616 if (!vcpu)
617 continue;
618 if (test_and_set_bit(req, &vcpu->requests))
619 continue;
620 cpu = vcpu->cpu;
621 if (cpus != NULL && cpu != -1 && cpu != me)
622 cpumask_set_cpu(cpu, cpus);
623 }
624 if (unlikely(cpus == NULL))
625 smp_call_function_many(cpu_online_mask, ack_flush, NULL, 1);
626 else if (!cpumask_empty(cpus))
627 smp_call_function_many(cpus, ack_flush, NULL, 1);
628 else
629 called = false;
630 put_cpu();
631 free_cpumask_var(cpus);
632 return called;
633 }
634
635 void kvm_flush_remote_tlbs(struct kvm *kvm)
636 {
637 if (make_all_cpus_request(kvm, KVM_REQ_TLB_FLUSH))
638 ++kvm->stat.remote_tlb_flush;
639 }
640
641 void kvm_reload_remote_mmus(struct kvm *kvm)
642 {
643 make_all_cpus_request(kvm, KVM_REQ_MMU_RELOAD);
644 }
645
646 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
647 {
648 struct page *page;
649 int r;
650
651 mutex_init(&vcpu->mutex);
652 vcpu->cpu = -1;
653 vcpu->kvm = kvm;
654 vcpu->vcpu_id = id;
655 init_waitqueue_head(&vcpu->wq);
656
657 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
658 if (!page) {
659 r = -ENOMEM;
660 goto fail;
661 }
662 vcpu->run = page_address(page);
663
664 r = kvm_arch_vcpu_init(vcpu);
665 if (r < 0)
666 goto fail_free_run;
667 return 0;
668
669 fail_free_run:
670 free_page((unsigned long)vcpu->run);
671 fail:
672 return r;
673 }
674 EXPORT_SYMBOL_GPL(kvm_vcpu_init);
675
676 void kvm_vcpu_uninit(struct kvm_vcpu *vcpu)
677 {
678 kvm_arch_vcpu_uninit(vcpu);
679 free_page((unsigned long)vcpu->run);
680 }
681 EXPORT_SYMBOL_GPL(kvm_vcpu_uninit);
682
683 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
684 static inline struct kvm *mmu_notifier_to_kvm(struct mmu_notifier *mn)
685 {
686 return container_of(mn, struct kvm, mmu_notifier);
687 }
688
689 static void kvm_mmu_notifier_invalidate_page(struct mmu_notifier *mn,
690 struct mm_struct *mm,
691 unsigned long address)
692 {
693 struct kvm *kvm = mmu_notifier_to_kvm(mn);
694 int need_tlb_flush;
695
696 /*
697 * When ->invalidate_page runs, the linux pte has been zapped
698 * already but the page is still allocated until
699 * ->invalidate_page returns. So if we increase the sequence
700 * here the kvm page fault will notice if the spte can't be
701 * established because the page is going to be freed. If
702 * instead the kvm page fault establishes the spte before
703 * ->invalidate_page runs, kvm_unmap_hva will release it
704 * before returning.
705 *
706 * The sequence increase only need to be seen at spin_unlock
707 * time, and not at spin_lock time.
708 *
709 * Increasing the sequence after the spin_unlock would be
710 * unsafe because the kvm page fault could then establish the
711 * pte after kvm_unmap_hva returned, without noticing the page
712 * is going to be freed.
713 */
714 spin_lock(&kvm->mmu_lock);
715 kvm->mmu_notifier_seq++;
716 need_tlb_flush = kvm_unmap_hva(kvm, address);
717 spin_unlock(&kvm->mmu_lock);
718
719 /* we've to flush the tlb before the pages can be freed */
720 if (need_tlb_flush)
721 kvm_flush_remote_tlbs(kvm);
722
723 }
724
725 static void kvm_mmu_notifier_invalidate_range_start(struct mmu_notifier *mn,
726 struct mm_struct *mm,
727 unsigned long start,
728 unsigned long end)
729 {
730 struct kvm *kvm = mmu_notifier_to_kvm(mn);
731 int need_tlb_flush = 0;
732
733 spin_lock(&kvm->mmu_lock);
734 /*
735 * The count increase must become visible at unlock time as no
736 * spte can be established without taking the mmu_lock and
737 * count is also read inside the mmu_lock critical section.
738 */
739 kvm->mmu_notifier_count++;
740 for (; start < end; start += PAGE_SIZE)
741 need_tlb_flush |= kvm_unmap_hva(kvm, start);
742 spin_unlock(&kvm->mmu_lock);
743
744 /* we've to flush the tlb before the pages can be freed */
745 if (need_tlb_flush)
746 kvm_flush_remote_tlbs(kvm);
747 }
748
749 static void kvm_mmu_notifier_invalidate_range_end(struct mmu_notifier *mn,
750 struct mm_struct *mm,
751 unsigned long start,
752 unsigned long end)
753 {
754 struct kvm *kvm = mmu_notifier_to_kvm(mn);
755
756 spin_lock(&kvm->mmu_lock);
757 /*
758 * This sequence increase will notify the kvm page fault that
759 * the page that is going to be mapped in the spte could have
760 * been freed.
761 */
762 kvm->mmu_notifier_seq++;
763 /*
764 * The above sequence increase must be visible before the
765 * below count decrease but both values are read by the kvm
766 * page fault under mmu_lock spinlock so we don't need to add
767 * a smb_wmb() here in between the two.
768 */
769 kvm->mmu_notifier_count--;
770 spin_unlock(&kvm->mmu_lock);
771
772 BUG_ON(kvm->mmu_notifier_count < 0);
773 }
774
775 static int kvm_mmu_notifier_clear_flush_young(struct mmu_notifier *mn,
776 struct mm_struct *mm,
777 unsigned long address)
778 {
779 struct kvm *kvm = mmu_notifier_to_kvm(mn);
780 int young;
781
782 spin_lock(&kvm->mmu_lock);
783 young = kvm_age_hva(kvm, address);
784 spin_unlock(&kvm->mmu_lock);
785
786 if (young)
787 kvm_flush_remote_tlbs(kvm);
788
789 return young;
790 }
791
792 static const struct mmu_notifier_ops kvm_mmu_notifier_ops = {
793 .invalidate_page = kvm_mmu_notifier_invalidate_page,
794 .invalidate_range_start = kvm_mmu_notifier_invalidate_range_start,
795 .invalidate_range_end = kvm_mmu_notifier_invalidate_range_end,
796 .clear_flush_young = kvm_mmu_notifier_clear_flush_young,
797 };
798 #endif /* CONFIG_MMU_NOTIFIER && KVM_ARCH_WANT_MMU_NOTIFIER */
799
800 static struct kvm *kvm_create_vm(void)
801 {
802 struct kvm *kvm = kvm_arch_create_vm();
803 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
804 struct page *page;
805 #endif
806
807 if (IS_ERR(kvm))
808 goto out;
809
810 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
811 page = alloc_page(GFP_KERNEL | __GFP_ZERO);
812 if (!page) {
813 kfree(kvm);
814 return ERR_PTR(-ENOMEM);
815 }
816 kvm->coalesced_mmio_ring =
817 (struct kvm_coalesced_mmio_ring *)page_address(page);
818 #endif
819
820 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
821 {
822 int err;
823 kvm->mmu_notifier.ops = &kvm_mmu_notifier_ops;
824 err = mmu_notifier_register(&kvm->mmu_notifier, current->mm);
825 if (err) {
826 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
827 put_page(page);
828 #endif
829 kfree(kvm);
830 return ERR_PTR(err);
831 }
832 }
833 #endif
834
835 kvm->mm = current->mm;
836 atomic_inc(&kvm->mm->mm_count);
837 spin_lock_init(&kvm->mmu_lock);
838 kvm_io_bus_init(&kvm->pio_bus);
839 mutex_init(&kvm->lock);
840 kvm_io_bus_init(&kvm->mmio_bus);
841 init_rwsem(&kvm->slots_lock);
842 atomic_set(&kvm->users_count, 1);
843 spin_lock(&kvm_lock);
844 list_add(&kvm->vm_list, &vm_list);
845 spin_unlock(&kvm_lock);
846 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
847 kvm_coalesced_mmio_init(kvm);
848 #endif
849 out:
850 return kvm;
851 }
852
853 /*
854 * Free any memory in @free but not in @dont.
855 */
856 static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
857 struct kvm_memory_slot *dont)
858 {
859 if (!dont || free->rmap != dont->rmap)
860 vfree(free->rmap);
861
862 if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
863 vfree(free->dirty_bitmap);
864
865 if (!dont || free->lpage_info != dont->lpage_info)
866 vfree(free->lpage_info);
867
868 free->npages = 0;
869 free->dirty_bitmap = NULL;
870 free->rmap = NULL;
871 free->lpage_info = NULL;
872 }
873
874 void kvm_free_physmem(struct kvm *kvm)
875 {
876 int i;
877
878 for (i = 0; i < kvm->nmemslots; ++i)
879 kvm_free_physmem_slot(&kvm->memslots[i], NULL);
880 }
881
882 static void kvm_destroy_vm(struct kvm *kvm)
883 {
884 struct mm_struct *mm = kvm->mm;
885
886 spin_lock(&kvm_lock);
887 list_del(&kvm->vm_list);
888 spin_unlock(&kvm_lock);
889 kvm_io_bus_destroy(&kvm->pio_bus);
890 kvm_io_bus_destroy(&kvm->mmio_bus);
891 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
892 if (kvm->coalesced_mmio_ring != NULL)
893 free_page((unsigned long)kvm->coalesced_mmio_ring);
894 #endif
895 #if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
896 mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
897 #endif
898 kvm_arch_destroy_vm(kvm);
899 mmdrop(mm);
900 }
901
902 void kvm_get_kvm(struct kvm *kvm)
903 {
904 atomic_inc(&kvm->users_count);
905 }
906 EXPORT_SYMBOL_GPL(kvm_get_kvm);
907
908 void kvm_put_kvm(struct kvm *kvm)
909 {
910 if (atomic_dec_and_test(&kvm->users_count))
911 kvm_destroy_vm(kvm);
912 }
913 EXPORT_SYMBOL_GPL(kvm_put_kvm);
914
915
916 static int kvm_vm_release(struct inode *inode, struct file *filp)
917 {
918 struct kvm *kvm = filp->private_data;
919
920 kvm_put_kvm(kvm);
921 return 0;
922 }
923
924 /*
925 * Allocate some memory and give it an address in the guest physical address
926 * space.
927 *
928 * Discontiguous memory is allowed, mostly for framebuffers.
929 *
930 * Must be called holding mmap_sem for write.
931 */
932 int __kvm_set_memory_region(struct kvm *kvm,
933 struct kvm_userspace_memory_region *mem,
934 int user_alloc)
935 {
936 int r;
937 gfn_t base_gfn;
938 unsigned long npages;
939 unsigned long i;
940 struct kvm_memory_slot *memslot;
941 struct kvm_memory_slot old, new;
942
943 r = -EINVAL;
944 /* General sanity checks */
945 if (mem->memory_size & (PAGE_SIZE - 1))
946 goto out;
947 if (mem->guest_phys_addr & (PAGE_SIZE - 1))
948 goto out;
949 if (user_alloc && (mem->userspace_addr & (PAGE_SIZE - 1)))
950 goto out;
951 if (mem->slot >= KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS)
952 goto out;
953 if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
954 goto out;
955
956 memslot = &kvm->memslots[mem->slot];
957 base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
958 npages = mem->memory_size >> PAGE_SHIFT;
959
960 if (!npages)
961 mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;
962
963 new = old = *memslot;
964
965 new.base_gfn = base_gfn;
966 new.npages = npages;
967 new.flags = mem->flags;
968
969 /* Disallow changing a memory slot's size. */
970 r = -EINVAL;
971 if (npages && old.npages && npages != old.npages)
972 goto out_free;
973
974 /* Check for overlaps */
975 r = -EEXIST;
976 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
977 struct kvm_memory_slot *s = &kvm->memslots[i];
978
979 if (s == memslot)
980 continue;
981 if (!((base_gfn + npages <= s->base_gfn) ||
982 (base_gfn >= s->base_gfn + s->npages)))
983 goto out_free;
984 }
985
986 /* Free page dirty bitmap if unneeded */
987 if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
988 new.dirty_bitmap = NULL;
989
990 r = -ENOMEM;
991
992 /* Allocate if a slot is being created */
993 #ifndef CONFIG_S390
994 if (npages && !new.rmap) {
995 new.rmap = vmalloc(npages * sizeof(struct page *));
996
997 if (!new.rmap)
998 goto out_free;
999
1000 memset(new.rmap, 0, npages * sizeof(*new.rmap));
1001
1002 new.user_alloc = user_alloc;
1003 /*
1004 * hva_to_rmmap() serialzies with the mmu_lock and to be
1005 * safe it has to ignore memslots with !user_alloc &&
1006 * !userspace_addr.
1007 */
1008 if (user_alloc)
1009 new.userspace_addr = mem->userspace_addr;
1010 else
1011 new.userspace_addr = 0;
1012 }
1013 if (npages && !new.lpage_info) {
1014 int largepages = npages / KVM_PAGES_PER_HPAGE;
1015 if (npages % KVM_PAGES_PER_HPAGE)
1016 largepages++;
1017 if (base_gfn % KVM_PAGES_PER_HPAGE)
1018 largepages++;
1019
1020 new.lpage_info = vmalloc(largepages * sizeof(*new.lpage_info));
1021
1022 if (!new.lpage_info)
1023 goto out_free;
1024
1025 memset(new.lpage_info, 0, largepages * sizeof(*new.lpage_info));
1026
1027 if (base_gfn % KVM_PAGES_PER_HPAGE)
1028 new.lpage_info[0].write_count = 1;
1029 if ((base_gfn+npages) % KVM_PAGES_PER_HPAGE)
1030 new.lpage_info[largepages-1].write_count = 1;
1031 }
1032
1033 /* Allocate page dirty bitmap if needed */
1034 if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
1035 unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;
1036
1037 new.dirty_bitmap = vmalloc(dirty_bytes);
1038 if (!new.dirty_bitmap)
1039 goto out_free;
1040 memset(new.dirty_bitmap, 0, dirty_bytes);
1041 }
1042 #endif /* not defined CONFIG_S390 */
1043
1044 if (!npages)
1045 kvm_arch_flush_shadow(kvm);
1046
1047 spin_lock(&kvm->mmu_lock);
1048 if (mem->slot >= kvm->nmemslots)
1049 kvm->nmemslots = mem->slot + 1;
1050
1051 *memslot = new;
1052 spin_unlock(&kvm->mmu_lock);
1053
1054 r = kvm_arch_set_memory_region(kvm, mem, old, user_alloc);
1055 if (r) {
1056 spin_lock(&kvm->mmu_lock);
1057 *memslot = old;
1058 spin_unlock(&kvm->mmu_lock);
1059 goto out_free;
1060 }
1061
1062 kvm_free_physmem_slot(&old, npages ? &new : NULL);
1063 /* Slot deletion case: we have to update the current slot */
1064 if (!npages)
1065 *memslot = old;
1066 #ifdef CONFIG_DMAR
1067 /* map the pages in iommu page table */
1068 r = kvm_iommu_map_pages(kvm, base_gfn, npages);
1069 if (r)
1070 goto out;
1071 #endif
1072 return 0;
1073
1074 out_free:
1075 kvm_free_physmem_slot(&new, &old);
1076 out:
1077 return r;
1078
1079 }
1080 EXPORT_SYMBOL_GPL(__kvm_set_memory_region);
1081
1082 int kvm_set_memory_region(struct kvm *kvm,
1083 struct kvm_userspace_memory_region *mem,
1084 int user_alloc)
1085 {
1086 int r;
1087
1088 down_write(&kvm->slots_lock);
1089 r = __kvm_set_memory_region(kvm, mem, user_alloc);
1090 up_write(&kvm->slots_lock);
1091 return r;
1092 }
1093 EXPORT_SYMBOL_GPL(kvm_set_memory_region);
1094
1095 int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
1096 struct
1097 kvm_userspace_memory_region *mem,
1098 int user_alloc)
1099 {
1100 if (mem->slot >= KVM_MEMORY_SLOTS)
1101 return -EINVAL;
1102 return kvm_set_memory_region(kvm, mem, user_alloc);
1103 }
1104
1105 int kvm_get_dirty_log(struct kvm *kvm,
1106 struct kvm_dirty_log *log, int *is_dirty)
1107 {
1108 struct kvm_memory_slot *memslot;
1109 int r, i;
1110 int n;
1111 unsigned long any = 0;
1112
1113 r = -EINVAL;
1114 if (log->slot >= KVM_MEMORY_SLOTS)
1115 goto out;
1116
1117 memslot = &kvm->memslots[log->slot];
1118 r = -ENOENT;
1119 if (!memslot->dirty_bitmap)
1120 goto out;
1121
1122 n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
1123
1124 for (i = 0; !any && i < n/sizeof(long); ++i)
1125 any = memslot->dirty_bitmap[i];
1126
1127 r = -EFAULT;
1128 if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
1129 goto out;
1130
1131 if (any)
1132 *is_dirty = 1;
1133
1134 r = 0;
1135 out:
1136 return r;
1137 }
1138
1139 int is_error_page(struct page *page)
1140 {
1141 return page == bad_page;
1142 }
1143 EXPORT_SYMBOL_GPL(is_error_page);
1144
1145 int is_error_pfn(pfn_t pfn)
1146 {
1147 return pfn == bad_pfn;
1148 }
1149 EXPORT_SYMBOL_GPL(is_error_pfn);
1150
1151 static inline unsigned long bad_hva(void)
1152 {
1153 return PAGE_OFFSET;
1154 }
1155
1156 int kvm_is_error_hva(unsigned long addr)
1157 {
1158 return addr == bad_hva();
1159 }
1160 EXPORT_SYMBOL_GPL(kvm_is_error_hva);
1161
1162 struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
1163 {
1164 int i;
1165
1166 for (i = 0; i < kvm->nmemslots; ++i) {
1167 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1168
1169 if (gfn >= memslot->base_gfn
1170 && gfn < memslot->base_gfn + memslot->npages)
1171 return memslot;
1172 }
1173 return NULL;
1174 }
1175 EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
1176
1177 struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
1178 {
1179 gfn = unalias_gfn(kvm, gfn);
1180 return gfn_to_memslot_unaliased(kvm, gfn);
1181 }
1182
1183 int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
1184 {
1185 int i;
1186
1187 gfn = unalias_gfn(kvm, gfn);
1188 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1189 struct kvm_memory_slot *memslot = &kvm->memslots[i];
1190
1191 if (gfn >= memslot->base_gfn
1192 && gfn < memslot->base_gfn + memslot->npages)
1193 return 1;
1194 }
1195 return 0;
1196 }
1197 EXPORT_SYMBOL_GPL(kvm_is_visible_gfn);
1198
1199 unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
1200 {
1201 struct kvm_memory_slot *slot;
1202
1203 gfn = unalias_gfn(kvm, gfn);
1204 slot = gfn_to_memslot_unaliased(kvm, gfn);
1205 if (!slot)
1206 return bad_hva();
1207 return (slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE);
1208 }
1209 EXPORT_SYMBOL_GPL(gfn_to_hva);
1210
1211 pfn_t gfn_to_pfn(struct kvm *kvm, gfn_t gfn)
1212 {
1213 struct page *page[1];
1214 unsigned long addr;
1215 int npages;
1216 pfn_t pfn;
1217
1218 might_sleep();
1219
1220 addr = gfn_to_hva(kvm, gfn);
1221 if (kvm_is_error_hva(addr)) {
1222 get_page(bad_page);
1223 return page_to_pfn(bad_page);
1224 }
1225
1226 npages = get_user_pages_fast(addr, 1, 1, page);
1227
1228 if (unlikely(npages != 1)) {
1229 struct vm_area_struct *vma;
1230
1231 down_read(&current->mm->mmap_sem);
1232 vma = find_vma(current->mm, addr);
1233
1234 if (vma == NULL || addr < vma->vm_start ||
1235 !(vma->vm_flags & VM_PFNMAP)) {
1236 up_read(&current->mm->mmap_sem);
1237 get_page(bad_page);
1238 return page_to_pfn(bad_page);
1239 }
1240
1241 pfn = ((addr - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
1242 up_read(&current->mm->mmap_sem);
1243 BUG_ON(!kvm_is_mmio_pfn(pfn));
1244 } else
1245 pfn = page_to_pfn(page[0]);
1246
1247 return pfn;
1248 }
1249
1250 EXPORT_SYMBOL_GPL(gfn_to_pfn);
1251
1252 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
1253 {
1254 pfn_t pfn;
1255
1256 pfn = gfn_to_pfn(kvm, gfn);
1257 if (!kvm_is_mmio_pfn(pfn))
1258 return pfn_to_page(pfn);
1259
1260 WARN_ON(kvm_is_mmio_pfn(pfn));
1261
1262 get_page(bad_page);
1263 return bad_page;
1264 }
1265
1266 EXPORT_SYMBOL_GPL(gfn_to_page);
1267
1268 void kvm_release_page_clean(struct page *page)
1269 {
1270 kvm_release_pfn_clean(page_to_pfn(page));
1271 }
1272 EXPORT_SYMBOL_GPL(kvm_release_page_clean);
1273
1274 void kvm_release_pfn_clean(pfn_t pfn)
1275 {
1276 if (!kvm_is_mmio_pfn(pfn))
1277 put_page(pfn_to_page(pfn));
1278 }
1279 EXPORT_SYMBOL_GPL(kvm_release_pfn_clean);
1280
1281 void kvm_release_page_dirty(struct page *page)
1282 {
1283 kvm_release_pfn_dirty(page_to_pfn(page));
1284 }
1285 EXPORT_SYMBOL_GPL(kvm_release_page_dirty);
1286
1287 void kvm_release_pfn_dirty(pfn_t pfn)
1288 {
1289 kvm_set_pfn_dirty(pfn);
1290 kvm_release_pfn_clean(pfn);
1291 }
1292 EXPORT_SYMBOL_GPL(kvm_release_pfn_dirty);
1293
1294 void kvm_set_page_dirty(struct page *page)
1295 {
1296 kvm_set_pfn_dirty(page_to_pfn(page));
1297 }
1298 EXPORT_SYMBOL_GPL(kvm_set_page_dirty);
1299
1300 void kvm_set_pfn_dirty(pfn_t pfn)
1301 {
1302 if (!kvm_is_mmio_pfn(pfn)) {
1303 struct page *page = pfn_to_page(pfn);
1304 if (!PageReserved(page))
1305 SetPageDirty(page);
1306 }
1307 }
1308 EXPORT_SYMBOL_GPL(kvm_set_pfn_dirty);
1309
1310 void kvm_set_pfn_accessed(pfn_t pfn)
1311 {
1312 if (!kvm_is_mmio_pfn(pfn))
1313 mark_page_accessed(pfn_to_page(pfn));
1314 }
1315 EXPORT_SYMBOL_GPL(kvm_set_pfn_accessed);
1316
1317 void kvm_get_pfn(pfn_t pfn)
1318 {
1319 if (!kvm_is_mmio_pfn(pfn))
1320 get_page(pfn_to_page(pfn));
1321 }
1322 EXPORT_SYMBOL_GPL(kvm_get_pfn);
1323
1324 static int next_segment(unsigned long len, int offset)
1325 {
1326 if (len > PAGE_SIZE - offset)
1327 return PAGE_SIZE - offset;
1328 else
1329 return len;
1330 }
1331
1332 int kvm_read_guest_page(struct kvm *kvm, gfn_t gfn, void *data, int offset,
1333 int len)
1334 {
1335 int r;
1336 unsigned long addr;
1337
1338 addr = gfn_to_hva(kvm, gfn);
1339 if (kvm_is_error_hva(addr))
1340 return -EFAULT;
1341 r = copy_from_user(data, (void __user *)addr + offset, len);
1342 if (r)
1343 return -EFAULT;
1344 return 0;
1345 }
1346 EXPORT_SYMBOL_GPL(kvm_read_guest_page);
1347
1348 int kvm_read_guest(struct kvm *kvm, gpa_t gpa, void *data, unsigned long len)
1349 {
1350 gfn_t gfn = gpa >> PAGE_SHIFT;
1351 int seg;
1352 int offset = offset_in_page(gpa);
1353 int ret;
1354
1355 while ((seg = next_segment(len, offset)) != 0) {
1356 ret = kvm_read_guest_page(kvm, gfn, data, offset, seg);
1357 if (ret < 0)
1358 return ret;
1359 offset = 0;
1360 len -= seg;
1361 data += seg;
1362 ++gfn;
1363 }
1364 return 0;
1365 }
1366 EXPORT_SYMBOL_GPL(kvm_read_guest);
1367
1368 int kvm_read_guest_atomic(struct kvm *kvm, gpa_t gpa, void *data,
1369 unsigned long len)
1370 {
1371 int r;
1372 unsigned long addr;
1373 gfn_t gfn = gpa >> PAGE_SHIFT;
1374 int offset = offset_in_page(gpa);
1375
1376 addr = gfn_to_hva(kvm, gfn);
1377 if (kvm_is_error_hva(addr))
1378 return -EFAULT;
1379 pagefault_disable();
1380 r = __copy_from_user_inatomic(data, (void __user *)addr + offset, len);
1381 pagefault_enable();
1382 if (r)
1383 return -EFAULT;
1384 return 0;
1385 }
1386 EXPORT_SYMBOL(kvm_read_guest_atomic);
1387
1388 int kvm_write_guest_page(struct kvm *kvm, gfn_t gfn, const void *data,
1389 int offset, int len)
1390 {
1391 int r;
1392 unsigned long addr;
1393
1394 addr = gfn_to_hva(kvm, gfn);
1395 if (kvm_is_error_hva(addr))
1396 return -EFAULT;
1397 r = copy_to_user((void __user *)addr + offset, data, len);
1398 if (r)
1399 return -EFAULT;
1400 mark_page_dirty(kvm, gfn);
1401 return 0;
1402 }
1403 EXPORT_SYMBOL_GPL(kvm_write_guest_page);
1404
1405 int kvm_write_guest(struct kvm *kvm, gpa_t gpa, const void *data,
1406 unsigned long len)
1407 {
1408 gfn_t gfn = gpa >> PAGE_SHIFT;
1409 int seg;
1410 int offset = offset_in_page(gpa);
1411 int ret;
1412
1413 while ((seg = next_segment(len, offset)) != 0) {
1414 ret = kvm_write_guest_page(kvm, gfn, data, offset, seg);
1415 if (ret < 0)
1416 return ret;
1417 offset = 0;
1418 len -= seg;
1419 data += seg;
1420 ++gfn;
1421 }
1422 return 0;
1423 }
1424
1425 int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len)
1426 {
1427 return kvm_write_guest_page(kvm, gfn, empty_zero_page, offset, len);
1428 }
1429 EXPORT_SYMBOL_GPL(kvm_clear_guest_page);
1430
1431 int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len)
1432 {
1433 gfn_t gfn = gpa >> PAGE_SHIFT;
1434 int seg;
1435 int offset = offset_in_page(gpa);
1436 int ret;
1437
1438 while ((seg = next_segment(len, offset)) != 0) {
1439 ret = kvm_clear_guest_page(kvm, gfn, offset, seg);
1440 if (ret < 0)
1441 return ret;
1442 offset = 0;
1443 len -= seg;
1444 ++gfn;
1445 }
1446 return 0;
1447 }
1448 EXPORT_SYMBOL_GPL(kvm_clear_guest);
1449
1450 void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
1451 {
1452 struct kvm_memory_slot *memslot;
1453
1454 gfn = unalias_gfn(kvm, gfn);
1455 memslot = gfn_to_memslot_unaliased(kvm, gfn);
1456 if (memslot && memslot->dirty_bitmap) {
1457 unsigned long rel_gfn = gfn - memslot->base_gfn;
1458
1459 /* avoid RMW */
1460 if (!test_bit(rel_gfn, memslot->dirty_bitmap))
1461 set_bit(rel_gfn, memslot->dirty_bitmap);
1462 }
1463 }
1464
1465 /*
1466 * The vCPU has executed a HLT instruction with in-kernel mode enabled.
1467 */
1468 void kvm_vcpu_block(struct kvm_vcpu *vcpu)
1469 {
1470 DEFINE_WAIT(wait);
1471
1472 for (;;) {
1473 prepare_to_wait(&vcpu->wq, &wait, TASK_INTERRUPTIBLE);
1474
1475 if (kvm_cpu_has_interrupt(vcpu) ||
1476 kvm_cpu_has_pending_timer(vcpu) ||
1477 kvm_arch_vcpu_runnable(vcpu)) {
1478 set_bit(KVM_REQ_UNHALT, &vcpu->requests);
1479 break;
1480 }
1481 if (signal_pending(current))
1482 break;
1483
1484 vcpu_put(vcpu);
1485 schedule();
1486 vcpu_load(vcpu);
1487 }
1488
1489 finish_wait(&vcpu->wq, &wait);
1490 }
1491
1492 void kvm_resched(struct kvm_vcpu *vcpu)
1493 {
1494 if (!need_resched())
1495 return;
1496 cond_resched();
1497 }
1498 EXPORT_SYMBOL_GPL(kvm_resched);
1499
1500 static int kvm_vcpu_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1501 {
1502 struct kvm_vcpu *vcpu = vma->vm_file->private_data;
1503 struct page *page;
1504
1505 if (vmf->pgoff == 0)
1506 page = virt_to_page(vcpu->run);
1507 #ifdef CONFIG_X86
1508 else if (vmf->pgoff == KVM_PIO_PAGE_OFFSET)
1509 page = virt_to_page(vcpu->arch.pio_data);
1510 #endif
1511 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1512 else if (vmf->pgoff == KVM_COALESCED_MMIO_PAGE_OFFSET)
1513 page = virt_to_page(vcpu->kvm->coalesced_mmio_ring);
1514 #endif
1515 else
1516 return VM_FAULT_SIGBUS;
1517 get_page(page);
1518 vmf->page = page;
1519 return 0;
1520 }
1521
1522 static struct vm_operations_struct kvm_vcpu_vm_ops = {
1523 .fault = kvm_vcpu_fault,
1524 };
1525
1526 static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
1527 {
1528 vma->vm_ops = &kvm_vcpu_vm_ops;
1529 return 0;
1530 }
1531
1532 static int kvm_vcpu_release(struct inode *inode, struct file *filp)
1533 {
1534 struct kvm_vcpu *vcpu = filp->private_data;
1535
1536 kvm_put_kvm(vcpu->kvm);
1537 return 0;
1538 }
1539
1540 static struct file_operations kvm_vcpu_fops = {
1541 .release = kvm_vcpu_release,
1542 .unlocked_ioctl = kvm_vcpu_ioctl,
1543 .compat_ioctl = kvm_vcpu_ioctl,
1544 .mmap = kvm_vcpu_mmap,
1545 };
1546
1547 /*
1548 * Allocates an inode for the vcpu.
1549 */
1550 static int create_vcpu_fd(struct kvm_vcpu *vcpu)
1551 {
1552 int fd = anon_inode_getfd("kvm-vcpu", &kvm_vcpu_fops, vcpu, 0);
1553 if (fd < 0)
1554 kvm_put_kvm(vcpu->kvm);
1555 return fd;
1556 }
1557
1558 /*
1559 * Creates some virtual cpus. Good luck creating more than one.
1560 */
1561 static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
1562 {
1563 int r;
1564 struct kvm_vcpu *vcpu;
1565
1566 if (!valid_vcpu(n))
1567 return -EINVAL;
1568
1569 vcpu = kvm_arch_vcpu_create(kvm, n);
1570 if (IS_ERR(vcpu))
1571 return PTR_ERR(vcpu);
1572
1573 preempt_notifier_init(&vcpu->preempt_notifier, &kvm_preempt_ops);
1574
1575 r = kvm_arch_vcpu_setup(vcpu);
1576 if (r)
1577 return r;
1578
1579 mutex_lock(&kvm->lock);
1580 if (kvm->vcpus[n]) {
1581 r = -EEXIST;
1582 goto vcpu_destroy;
1583 }
1584 kvm->vcpus[n] = vcpu;
1585 mutex_unlock(&kvm->lock);
1586
1587 /* Now it's all set up, let userspace reach it */
1588 kvm_get_kvm(kvm);
1589 r = create_vcpu_fd(vcpu);
1590 if (r < 0)
1591 goto unlink;
1592 return r;
1593
1594 unlink:
1595 mutex_lock(&kvm->lock);
1596 kvm->vcpus[n] = NULL;
1597 vcpu_destroy:
1598 mutex_unlock(&kvm->lock);
1599 kvm_arch_vcpu_destroy(vcpu);
1600 return r;
1601 }
1602
1603 static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1604 {
1605 if (sigset) {
1606 sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
1607 vcpu->sigset_active = 1;
1608 vcpu->sigset = *sigset;
1609 } else
1610 vcpu->sigset_active = 0;
1611 return 0;
1612 }
1613
1614 static long kvm_vcpu_ioctl(struct file *filp,
1615 unsigned int ioctl, unsigned long arg)
1616 {
1617 struct kvm_vcpu *vcpu = filp->private_data;
1618 void __user *argp = (void __user *)arg;
1619 int r;
1620 struct kvm_fpu *fpu = NULL;
1621 struct kvm_sregs *kvm_sregs = NULL;
1622
1623 if (vcpu->kvm->mm != current->mm)
1624 return -EIO;
1625 switch (ioctl) {
1626 case KVM_RUN:
1627 r = -EINVAL;
1628 if (arg)
1629 goto out;
1630 r = kvm_arch_vcpu_ioctl_run(vcpu, vcpu->run);
1631 break;
1632 case KVM_GET_REGS: {
1633 struct kvm_regs *kvm_regs;
1634
1635 r = -ENOMEM;
1636 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1637 if (!kvm_regs)
1638 goto out;
1639 r = kvm_arch_vcpu_ioctl_get_regs(vcpu, kvm_regs);
1640 if (r)
1641 goto out_free1;
1642 r = -EFAULT;
1643 if (copy_to_user(argp, kvm_regs, sizeof(struct kvm_regs)))
1644 goto out_free1;
1645 r = 0;
1646 out_free1:
1647 kfree(kvm_regs);
1648 break;
1649 }
1650 case KVM_SET_REGS: {
1651 struct kvm_regs *kvm_regs;
1652
1653 r = -ENOMEM;
1654 kvm_regs = kzalloc(sizeof(struct kvm_regs), GFP_KERNEL);
1655 if (!kvm_regs)
1656 goto out;
1657 r = -EFAULT;
1658 if (copy_from_user(kvm_regs, argp, sizeof(struct kvm_regs)))
1659 goto out_free2;
1660 r = kvm_arch_vcpu_ioctl_set_regs(vcpu, kvm_regs);
1661 if (r)
1662 goto out_free2;
1663 r = 0;
1664 out_free2:
1665 kfree(kvm_regs);
1666 break;
1667 }
1668 case KVM_GET_SREGS: {
1669 kvm_sregs = kzalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1670 r = -ENOMEM;
1671 if (!kvm_sregs)
1672 goto out;
1673 r = kvm_arch_vcpu_ioctl_get_sregs(vcpu, kvm_sregs);
1674 if (r)
1675 goto out;
1676 r = -EFAULT;
1677 if (copy_to_user(argp, kvm_sregs, sizeof(struct kvm_sregs)))
1678 goto out;
1679 r = 0;
1680 break;
1681 }
1682 case KVM_SET_SREGS: {
1683 kvm_sregs = kmalloc(sizeof(struct kvm_sregs), GFP_KERNEL);
1684 r = -ENOMEM;
1685 if (!kvm_sregs)
1686 goto out;
1687 r = -EFAULT;
1688 if (copy_from_user(kvm_sregs, argp, sizeof(struct kvm_sregs)))
1689 goto out;
1690 r = kvm_arch_vcpu_ioctl_set_sregs(vcpu, kvm_sregs);
1691 if (r)
1692 goto out;
1693 r = 0;
1694 break;
1695 }
1696 case KVM_GET_MP_STATE: {
1697 struct kvm_mp_state mp_state;
1698
1699 r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
1700 if (r)
1701 goto out;
1702 r = -EFAULT;
1703 if (copy_to_user(argp, &mp_state, sizeof mp_state))
1704 goto out;
1705 r = 0;
1706 break;
1707 }
1708 case KVM_SET_MP_STATE: {
1709 struct kvm_mp_state mp_state;
1710
1711 r = -EFAULT;
1712 if (copy_from_user(&mp_state, argp, sizeof mp_state))
1713 goto out;
1714 r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
1715 if (r)
1716 goto out;
1717 r = 0;
1718 break;
1719 }
1720 case KVM_TRANSLATE: {
1721 struct kvm_translation tr;
1722
1723 r = -EFAULT;
1724 if (copy_from_user(&tr, argp, sizeof tr))
1725 goto out;
1726 r = kvm_arch_vcpu_ioctl_translate(vcpu, &tr);
1727 if (r)
1728 goto out;
1729 r = -EFAULT;
1730 if (copy_to_user(argp, &tr, sizeof tr))
1731 goto out;
1732 r = 0;
1733 break;
1734 }
1735 case KVM_DEBUG_GUEST: {
1736 struct kvm_debug_guest dbg;
1737
1738 r = -EFAULT;
1739 if (copy_from_user(&dbg, argp, sizeof dbg))
1740 goto out;
1741 r = kvm_arch_vcpu_ioctl_debug_guest(vcpu, &dbg);
1742 if (r)
1743 goto out;
1744 r = 0;
1745 break;
1746 }
1747 case KVM_SET_SIGNAL_MASK: {
1748 struct kvm_signal_mask __user *sigmask_arg = argp;
1749 struct kvm_signal_mask kvm_sigmask;
1750 sigset_t sigset, *p;
1751
1752 p = NULL;
1753 if (argp) {
1754 r = -EFAULT;
1755 if (copy_from_user(&kvm_sigmask, argp,
1756 sizeof kvm_sigmask))
1757 goto out;
1758 r = -EINVAL;
1759 if (kvm_sigmask.len != sizeof sigset)
1760 goto out;
1761 r = -EFAULT;
1762 if (copy_from_user(&sigset, sigmask_arg->sigset,
1763 sizeof sigset))
1764 goto out;
1765 p = &sigset;
1766 }
1767 r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
1768 break;
1769 }
1770 case KVM_GET_FPU: {
1771 fpu = kzalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1772 r = -ENOMEM;
1773 if (!fpu)
1774 goto out;
1775 r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
1776 if (r)
1777 goto out;
1778 r = -EFAULT;
1779 if (copy_to_user(argp, fpu, sizeof(struct kvm_fpu)))
1780 goto out;
1781 r = 0;
1782 break;
1783 }
1784 case KVM_SET_FPU: {
1785 fpu = kmalloc(sizeof(struct kvm_fpu), GFP_KERNEL);
1786 r = -ENOMEM;
1787 if (!fpu)
1788 goto out;
1789 r = -EFAULT;
1790 if (copy_from_user(fpu, argp, sizeof(struct kvm_fpu)))
1791 goto out;
1792 r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, fpu);
1793 if (r)
1794 goto out;
1795 r = 0;
1796 break;
1797 }
1798 default:
1799 r = kvm_arch_vcpu_ioctl(filp, ioctl, arg);
1800 }
1801 out:
1802 kfree(fpu);
1803 kfree(kvm_sregs);
1804 return r;
1805 }
1806
1807 static long kvm_vm_ioctl(struct file *filp,
1808 unsigned int ioctl, unsigned long arg)
1809 {
1810 struct kvm *kvm = filp->private_data;
1811 void __user *argp = (void __user *)arg;
1812 int r;
1813
1814 if (kvm->mm != current->mm)
1815 return -EIO;
1816 switch (ioctl) {
1817 case KVM_CREATE_VCPU:
1818 r = kvm_vm_ioctl_create_vcpu(kvm, arg);
1819 if (r < 0)
1820 goto out;
1821 break;
1822 case KVM_SET_USER_MEMORY_REGION: {
1823 struct kvm_userspace_memory_region kvm_userspace_mem;
1824
1825 r = -EFAULT;
1826 if (copy_from_user(&kvm_userspace_mem, argp,
1827 sizeof kvm_userspace_mem))
1828 goto out;
1829
1830 r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_userspace_mem, 1);
1831 if (r)
1832 goto out;
1833 break;
1834 }
1835 case KVM_GET_DIRTY_LOG: {
1836 struct kvm_dirty_log log;
1837
1838 r = -EFAULT;
1839 if (copy_from_user(&log, argp, sizeof log))
1840 goto out;
1841 r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
1842 if (r)
1843 goto out;
1844 break;
1845 }
1846 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
1847 case KVM_REGISTER_COALESCED_MMIO: {
1848 struct kvm_coalesced_mmio_zone zone;
1849 r = -EFAULT;
1850 if (copy_from_user(&zone, argp, sizeof zone))
1851 goto out;
1852 r = -ENXIO;
1853 r = kvm_vm_ioctl_register_coalesced_mmio(kvm, &zone);
1854 if (r)
1855 goto out;
1856 r = 0;
1857 break;
1858 }
1859 case KVM_UNREGISTER_COALESCED_MMIO: {
1860 struct kvm_coalesced_mmio_zone zone;
1861 r = -EFAULT;
1862 if (copy_from_user(&zone, argp, sizeof zone))
1863 goto out;
1864 r = -ENXIO;
1865 r = kvm_vm_ioctl_unregister_coalesced_mmio(kvm, &zone);
1866 if (r)
1867 goto out;
1868 r = 0;
1869 break;
1870 }
1871 #endif
1872 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
1873 case KVM_ASSIGN_PCI_DEVICE: {
1874 struct kvm_assigned_pci_dev assigned_dev;
1875
1876 r = -EFAULT;
1877 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1878 goto out;
1879 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
1880 if (r)
1881 goto out;
1882 break;
1883 }
1884 case KVM_ASSIGN_IRQ: {
1885 struct kvm_assigned_irq assigned_irq;
1886
1887 r = -EFAULT;
1888 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
1889 goto out;
1890 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
1891 if (r)
1892 goto out;
1893 break;
1894 }
1895 #endif
1896 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
1897 case KVM_DEASSIGN_PCI_DEVICE: {
1898 struct kvm_assigned_pci_dev assigned_dev;
1899
1900 r = -EFAULT;
1901 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1902 goto out;
1903 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
1904 if (r)
1905 goto out;
1906 break;
1907 }
1908 #endif
1909 default:
1910 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1911 }
1912 out:
1913 return r;
1914 }
1915
1916 static int kvm_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
1917 {
1918 struct page *page[1];
1919 unsigned long addr;
1920 int npages;
1921 gfn_t gfn = vmf->pgoff;
1922 struct kvm *kvm = vma->vm_file->private_data;
1923
1924 addr = gfn_to_hva(kvm, gfn);
1925 if (kvm_is_error_hva(addr))
1926 return VM_FAULT_SIGBUS;
1927
1928 npages = get_user_pages(current, current->mm, addr, 1, 1, 0, page,
1929 NULL);
1930 if (unlikely(npages != 1))
1931 return VM_FAULT_SIGBUS;
1932
1933 vmf->page = page[0];
1934 return 0;
1935 }
1936
1937 static struct vm_operations_struct kvm_vm_vm_ops = {
1938 .fault = kvm_vm_fault,
1939 };
1940
1941 static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
1942 {
1943 vma->vm_ops = &kvm_vm_vm_ops;
1944 return 0;
1945 }
1946
1947 static struct file_operations kvm_vm_fops = {
1948 .release = kvm_vm_release,
1949 .unlocked_ioctl = kvm_vm_ioctl,
1950 .compat_ioctl = kvm_vm_ioctl,
1951 .mmap = kvm_vm_mmap,
1952 };
1953
1954 static int kvm_dev_ioctl_create_vm(void)
1955 {
1956 int fd;
1957 struct kvm *kvm;
1958
1959 kvm = kvm_create_vm();
1960 if (IS_ERR(kvm))
1961 return PTR_ERR(kvm);
1962 fd = anon_inode_getfd("kvm-vm", &kvm_vm_fops, kvm, 0);
1963 if (fd < 0)
1964 kvm_put_kvm(kvm);
1965
1966 return fd;
1967 }
1968
1969 static long kvm_dev_ioctl_check_extension_generic(long arg)
1970 {
1971 switch (arg) {
1972 case KVM_CAP_USER_MEMORY:
1973 case KVM_CAP_DESTROY_MEMORY_REGION_WORKS:
1974 return 1;
1975 default:
1976 break;
1977 }
1978 return kvm_dev_ioctl_check_extension(arg);
1979 }
1980
1981 static long kvm_dev_ioctl(struct file *filp,
1982 unsigned int ioctl, unsigned long arg)
1983 {
1984 long r = -EINVAL;
1985
1986 switch (ioctl) {
1987 case KVM_GET_API_VERSION:
1988 r = -EINVAL;
1989 if (arg)
1990 goto out;
1991 r = KVM_API_VERSION;
1992 break;
1993 case KVM_CREATE_VM:
1994 r = -EINVAL;
1995 if (arg)
1996 goto out;
1997 r = kvm_dev_ioctl_create_vm();
1998 break;
1999 case KVM_CHECK_EXTENSION:
2000 r = kvm_dev_ioctl_check_extension_generic(arg);
2001 break;
2002 case KVM_GET_VCPU_MMAP_SIZE:
2003 r = -EINVAL;
2004 if (arg)
2005 goto out;
2006 r = PAGE_SIZE; /* struct kvm_run */
2007 #ifdef CONFIG_X86
2008 r += PAGE_SIZE; /* pio data page */
2009 #endif
2010 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
2011 r += PAGE_SIZE; /* coalesced mmio ring page */
2012 #endif
2013 break;
2014 case KVM_TRACE_ENABLE:
2015 case KVM_TRACE_PAUSE:
2016 case KVM_TRACE_DISABLE:
2017 r = kvm_trace_ioctl(ioctl, arg);
2018 break;
2019 default:
2020 return kvm_arch_dev_ioctl(filp, ioctl, arg);
2021 }
2022 out:
2023 return r;
2024 }
2025
2026 static struct file_operations kvm_chardev_ops = {
2027 .unlocked_ioctl = kvm_dev_ioctl,
2028 .compat_ioctl = kvm_dev_ioctl,
2029 };
2030
2031 static struct miscdevice kvm_dev = {
2032 KVM_MINOR,
2033 "kvm",
2034 &kvm_chardev_ops,
2035 };
2036
2037 static void hardware_enable(void *junk)
2038 {
2039 int cpu = raw_smp_processor_id();
2040
2041 if (cpumask_test_cpu(cpu, cpus_hardware_enabled))
2042 return;
2043 cpumask_set_cpu(cpu, cpus_hardware_enabled);
2044 kvm_arch_hardware_enable(NULL);
2045 }
2046
2047 static void hardware_disable(void *junk)
2048 {
2049 int cpu = raw_smp_processor_id();
2050
2051 if (!cpumask_test_cpu(cpu, cpus_hardware_enabled))
2052 return;
2053 cpumask_clear_cpu(cpu, cpus_hardware_enabled);
2054 kvm_arch_hardware_disable(NULL);
2055 }
2056
2057 static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
2058 void *v)
2059 {
2060 int cpu = (long)v;
2061
2062 val &= ~CPU_TASKS_FROZEN;
2063 switch (val) {
2064 case CPU_DYING:
2065 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2066 cpu);
2067 hardware_disable(NULL);
2068 break;
2069 case CPU_UP_CANCELED:
2070 printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
2071 cpu);
2072 smp_call_function_single(cpu, hardware_disable, NULL, 1);
2073 break;
2074 case CPU_ONLINE:
2075 printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
2076 cpu);
2077 smp_call_function_single(cpu, hardware_enable, NULL, 1);
2078 break;
2079 }
2080 return NOTIFY_OK;
2081 }
2082
2083
2084 asmlinkage void kvm_handle_fault_on_reboot(void)
2085 {
2086 if (kvm_rebooting)
2087 /* spin while reset goes on */
2088 while (true)
2089 ;
2090 /* Fault while not rebooting. We want the trace. */
2091 BUG();
2092 }
2093 EXPORT_SYMBOL_GPL(kvm_handle_fault_on_reboot);
2094
2095 static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
2096 void *v)
2097 {
2098 if (val == SYS_RESTART) {
2099 /*
2100 * Some (well, at least mine) BIOSes hang on reboot if
2101 * in vmx root mode.
2102 */
2103 printk(KERN_INFO "kvm: exiting hardware virtualization\n");
2104 kvm_rebooting = true;
2105 on_each_cpu(hardware_disable, NULL, 1);
2106 }
2107 return NOTIFY_OK;
2108 }
2109
2110 static struct notifier_block kvm_reboot_notifier = {
2111 .notifier_call = kvm_reboot,
2112 .priority = 0,
2113 };
2114
2115 void kvm_io_bus_init(struct kvm_io_bus *bus)
2116 {
2117 memset(bus, 0, sizeof(*bus));
2118 }
2119
2120 void kvm_io_bus_destroy(struct kvm_io_bus *bus)
2121 {
2122 int i;
2123
2124 for (i = 0; i < bus->dev_count; i++) {
2125 struct kvm_io_device *pos = bus->devs[i];
2126
2127 kvm_iodevice_destructor(pos);
2128 }
2129 }
2130
2131 struct kvm_io_device *kvm_io_bus_find_dev(struct kvm_io_bus *bus,
2132 gpa_t addr, int len, int is_write)
2133 {
2134 int i;
2135
2136 for (i = 0; i < bus->dev_count; i++) {
2137 struct kvm_io_device *pos = bus->devs[i];
2138
2139 if (pos->in_range(pos, addr, len, is_write))
2140 return pos;
2141 }
2142
2143 return NULL;
2144 }
2145
2146 void kvm_io_bus_register_dev(struct kvm_io_bus *bus, struct kvm_io_device *dev)
2147 {
2148 BUG_ON(bus->dev_count > (NR_IOBUS_DEVS-1));
2149
2150 bus->devs[bus->dev_count++] = dev;
2151 }
2152
2153 static struct notifier_block kvm_cpu_notifier = {
2154 .notifier_call = kvm_cpu_hotplug,
2155 .priority = 20, /* must be > scheduler priority */
2156 };
2157
2158 static int vm_stat_get(void *_offset, u64 *val)
2159 {
2160 unsigned offset = (long)_offset;
2161 struct kvm *kvm;
2162
2163 *val = 0;
2164 spin_lock(&kvm_lock);
2165 list_for_each_entry(kvm, &vm_list, vm_list)
2166 *val += *(u32 *)((void *)kvm + offset);
2167 spin_unlock(&kvm_lock);
2168 return 0;
2169 }
2170
2171 DEFINE_SIMPLE_ATTRIBUTE(vm_stat_fops, vm_stat_get, NULL, "%llu\n");
2172
2173 static int vcpu_stat_get(void *_offset, u64 *val)
2174 {
2175 unsigned offset = (long)_offset;
2176 struct kvm *kvm;
2177 struct kvm_vcpu *vcpu;
2178 int i;
2179
2180 *val = 0;
2181 spin_lock(&kvm_lock);
2182 list_for_each_entry(kvm, &vm_list, vm_list)
2183 for (i = 0; i < KVM_MAX_VCPUS; ++i) {
2184 vcpu = kvm->vcpus[i];
2185 if (vcpu)
2186 *val += *(u32 *)((void *)vcpu + offset);
2187 }
2188 spin_unlock(&kvm_lock);
2189 return 0;
2190 }
2191
2192 DEFINE_SIMPLE_ATTRIBUTE(vcpu_stat_fops, vcpu_stat_get, NULL, "%llu\n");
2193
2194 static struct file_operations *stat_fops[] = {
2195 [KVM_STAT_VCPU] = &vcpu_stat_fops,
2196 [KVM_STAT_VM] = &vm_stat_fops,
2197 };
2198
2199 static void kvm_init_debug(void)
2200 {
2201 struct kvm_stats_debugfs_item *p;
2202
2203 kvm_debugfs_dir = debugfs_create_dir("kvm", NULL);
2204 for (p = debugfs_entries; p->name; ++p)
2205 p->dentry = debugfs_create_file(p->name, 0444, kvm_debugfs_dir,
2206 (void *)(long)p->offset,
2207 stat_fops[p->kind]);
2208 }
2209
2210 static void kvm_exit_debug(void)
2211 {
2212 struct kvm_stats_debugfs_item *p;
2213
2214 for (p = debugfs_entries; p->name; ++p)
2215 debugfs_remove(p->dentry);
2216 debugfs_remove(kvm_debugfs_dir);
2217 }
2218
2219 static int kvm_suspend(struct sys_device *dev, pm_message_t state)
2220 {
2221 hardware_disable(NULL);
2222 return 0;
2223 }
2224
2225 static int kvm_resume(struct sys_device *dev)
2226 {
2227 hardware_enable(NULL);
2228 return 0;
2229 }
2230
2231 static struct sysdev_class kvm_sysdev_class = {
2232 .name = "kvm",
2233 .suspend = kvm_suspend,
2234 .resume = kvm_resume,
2235 };
2236
2237 static struct sys_device kvm_sysdev = {
2238 .id = 0,
2239 .cls = &kvm_sysdev_class,
2240 };
2241
2242 struct page *bad_page;
2243 pfn_t bad_pfn;
2244
2245 static inline
2246 struct kvm_vcpu *preempt_notifier_to_vcpu(struct preempt_notifier *pn)
2247 {
2248 return container_of(pn, struct kvm_vcpu, preempt_notifier);
2249 }
2250
2251 static void kvm_sched_in(struct preempt_notifier *pn, int cpu)
2252 {
2253 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2254
2255 kvm_arch_vcpu_load(vcpu, cpu);
2256 }
2257
2258 static void kvm_sched_out(struct preempt_notifier *pn,
2259 struct task_struct *next)
2260 {
2261 struct kvm_vcpu *vcpu = preempt_notifier_to_vcpu(pn);
2262
2263 kvm_arch_vcpu_put(vcpu);
2264 }
2265
2266 int kvm_init(void *opaque, unsigned int vcpu_size,
2267 struct module *module)
2268 {
2269 int r;
2270 int cpu;
2271
2272 kvm_init_debug();
2273
2274 r = kvm_arch_init(opaque);
2275 if (r)
2276 goto out_fail;
2277
2278 bad_page = alloc_page(GFP_KERNEL | __GFP_ZERO);
2279
2280 if (bad_page == NULL) {
2281 r = -ENOMEM;
2282 goto out;
2283 }
2284
2285 bad_pfn = page_to_pfn(bad_page);
2286
2287 if (!alloc_cpumask_var(&cpus_hardware_enabled, GFP_KERNEL)) {
2288 r = -ENOMEM;
2289 goto out_free_0;
2290 }
2291
2292 r = kvm_arch_hardware_setup();
2293 if (r < 0)
2294 goto out_free_0a;
2295
2296 for_each_online_cpu(cpu) {
2297 smp_call_function_single(cpu,
2298 kvm_arch_check_processor_compat,
2299 &r, 1);
2300 if (r < 0)
2301 goto out_free_1;
2302 }
2303
2304 on_each_cpu(hardware_enable, NULL, 1);
2305 r = register_cpu_notifier(&kvm_cpu_notifier);
2306 if (r)
2307 goto out_free_2;
2308 register_reboot_notifier(&kvm_reboot_notifier);
2309
2310 r = sysdev_class_register(&kvm_sysdev_class);
2311 if (r)
2312 goto out_free_3;
2313
2314 r = sysdev_register(&kvm_sysdev);
2315 if (r)
2316 goto out_free_4;
2317
2318 /* A kmem cache lets us meet the alignment requirements of fx_save. */
2319 kvm_vcpu_cache = kmem_cache_create("kvm_vcpu", vcpu_size,
2320 __alignof__(struct kvm_vcpu),
2321 0, NULL);
2322 if (!kvm_vcpu_cache) {
2323 r = -ENOMEM;
2324 goto out_free_5;
2325 }
2326
2327 kvm_chardev_ops.owner = module;
2328 kvm_vm_fops.owner = module;
2329 kvm_vcpu_fops.owner = module;
2330
2331 r = misc_register(&kvm_dev);
2332 if (r) {
2333 printk(KERN_ERR "kvm: misc device register failed\n");
2334 goto out_free;
2335 }
2336
2337 kvm_preempt_ops.sched_in = kvm_sched_in;
2338 kvm_preempt_ops.sched_out = kvm_sched_out;
2339 #ifndef CONFIG_X86
2340 msi2intx = 0;
2341 #endif
2342
2343 return 0;
2344
2345 out_free:
2346 kmem_cache_destroy(kvm_vcpu_cache);
2347 out_free_5:
2348 sysdev_unregister(&kvm_sysdev);
2349 out_free_4:
2350 sysdev_class_unregister(&kvm_sysdev_class);
2351 out_free_3:
2352 unregister_reboot_notifier(&kvm_reboot_notifier);
2353 unregister_cpu_notifier(&kvm_cpu_notifier);
2354 out_free_2:
2355 on_each_cpu(hardware_disable, NULL, 1);
2356 out_free_1:
2357 kvm_arch_hardware_unsetup();
2358 out_free_0a:
2359 free_cpumask_var(cpus_hardware_enabled);
2360 out_free_0:
2361 __free_page(bad_page);
2362 out:
2363 kvm_arch_exit();
2364 kvm_exit_debug();
2365 out_fail:
2366 return r;
2367 }
2368 EXPORT_SYMBOL_GPL(kvm_init);
2369
2370 void kvm_exit(void)
2371 {
2372 kvm_trace_cleanup();
2373 misc_deregister(&kvm_dev);
2374 kmem_cache_destroy(kvm_vcpu_cache);
2375 sysdev_unregister(&kvm_sysdev);
2376 sysdev_class_unregister(&kvm_sysdev_class);
2377 unregister_reboot_notifier(&kvm_reboot_notifier);
2378 unregister_cpu_notifier(&kvm_cpu_notifier);
2379 on_each_cpu(hardware_disable, NULL, 1);
2380 kvm_arch_hardware_unsetup();
2381 kvm_arch_exit();
2382 kvm_exit_debug();
2383 free_cpumask_var(cpus_hardware_enabled);
2384 __free_page(bad_page);
2385 }
2386 EXPORT_SYMBOL_GPL(kvm_exit);
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree