1 /*
2 * Kernel-based Virtual Machine - device assignment support
3 *
4 * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
5 *
6 * This work is licensed under the terms of the GNU GPL, version 2. See
7 * the COPYING file in the top-level directory.
8 *
9 */
10
11 #include <linux/kvm_host.h>
12 #include <linux/kvm.h>
13 #include <linux/uaccess.h>
14 #include <linux/vmalloc.h>
15 #include <linux/errno.h>
16 #include <linux/spinlock.h>
17 #include <linux/pci.h>
18 #include <linux/interrupt.h>
19 #include <linux/slab.h>
20 #include <linux/namei.h>
21 #include <linux/fs.h>
22 #include "irq.h"
23
24 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
25 int assigned_dev_id)
26 {
27 struct list_head *ptr;
28 struct kvm_assigned_dev_kernel *match;
29
30 list_for_each(ptr, head) {
31 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
32 if (match->assigned_dev_id == assigned_dev_id)
33 return match;
34 }
35 return NULL;
36 }
37
38 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
39 *assigned_dev, int irq)
40 {
41 int i, index;
42 struct msix_entry *host_msix_entries;
43
44 host_msix_entries = assigned_dev->host_msix_entries;
45
46 index = -1;
47 for (i = 0; i < assigned_dev->entries_nr; i++)
48 if (irq == host_msix_entries[i].vector) {
49 index = i;
50 break;
51 }
52 if (index < 0)
53 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
54
55 return index;
56 }
57
58 static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id)
59 {
60 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
61 int ret;
62
63 spin_lock(&assigned_dev->intx_lock);
64 if (pci_check_and_mask_intx(assigned_dev->dev)) {
65 assigned_dev->host_irq_disabled = true;
66 ret = IRQ_WAKE_THREAD;
67 } else
68 ret = IRQ_NONE;
69 spin_unlock(&assigned_dev->intx_lock);
70
71 return ret;
72 }
73
74 static void
75 kvm_assigned_dev_raise_guest_irq(struct kvm_assigned_dev_kernel *assigned_dev,
76 int vector)
77 {
78 if (unlikely(assigned_dev->irq_requested_type &
79 KVM_DEV_IRQ_GUEST_INTX)) {
80 spin_lock(&assigned_dev->intx_mask_lock);
81 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
82 kvm_set_irq(assigned_dev->kvm,
83 assigned_dev->irq_source_id, vector, 1,
84 false);
85 spin_unlock(&assigned_dev->intx_mask_lock);
86 } else
87 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
88 vector, 1, false);
89 }
90
91 static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
92 {
93 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
94
95 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
96 spin_lock_irq(&assigned_dev->intx_lock);
97 disable_irq_nosync(irq);
98 assigned_dev->host_irq_disabled = true;
99 spin_unlock_irq(&assigned_dev->intx_lock);
100 }
101
102 kvm_assigned_dev_raise_guest_irq(assigned_dev,
103 assigned_dev->guest_irq);
104
105 return IRQ_HANDLED;
106 }
107
108 #ifdef __KVM_HAVE_MSI
109 static irqreturn_t kvm_assigned_dev_msi(int irq, void *dev_id)
110 {
111 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
112 int ret = kvm_set_irq_inatomic(assigned_dev->kvm,
113 assigned_dev->irq_source_id,
114 assigned_dev->guest_irq, 1);
115 return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
116 }
117
118 static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id)
119 {
120 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
121
122 kvm_assigned_dev_raise_guest_irq(assigned_dev,
123 assigned_dev->guest_irq);
124
125 return IRQ_HANDLED;
126 }
127 #endif
128
129 #ifdef __KVM_HAVE_MSIX
130 static irqreturn_t kvm_assigned_dev_msix(int irq, void *dev_id)
131 {
132 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
133 int index = find_index_from_host_irq(assigned_dev, irq);
134 u32 vector;
135 int ret = 0;
136
137 if (index >= 0) {
138 vector = assigned_dev->guest_msix_entries[index].vector;
139 ret = kvm_set_irq_inatomic(assigned_dev->kvm,
140 assigned_dev->irq_source_id,
141 vector, 1);
142 }
143
144 return unlikely(ret == -EWOULDBLOCK) ? IRQ_WAKE_THREAD : IRQ_HANDLED;
145 }
146
147 static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id)
148 {
149 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
150 int index = find_index_from_host_irq(assigned_dev, irq);
151 u32 vector;
152
153 if (index >= 0) {
154 vector = assigned_dev->guest_msix_entries[index].vector;
155 kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
156 }
157
158 return IRQ_HANDLED;
159 }
160 #endif
161
162 /* Ack the irq line for an assigned device */
163 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
164 {
165 struct kvm_assigned_dev_kernel *dev =
166 container_of(kian, struct kvm_assigned_dev_kernel,
167 ack_notifier);
168
169 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false);
170
171 spin_lock(&dev->intx_mask_lock);
172
173 if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) {
174 bool reassert = false;
175
176 spin_lock_irq(&dev->intx_lock);
177 /*
178 * The guest IRQ may be shared so this ack can come from an
179 * IRQ for another guest device.
180 */
181 if (dev->host_irq_disabled) {
182 if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3))
183 enable_irq(dev->host_irq);
184 else if (!pci_check_and_unmask_intx(dev->dev))
185 reassert = true;
186 dev->host_irq_disabled = reassert;
187 }
188 spin_unlock_irq(&dev->intx_lock);
189
190 if (reassert)
191 kvm_set_irq(dev->kvm, dev->irq_source_id,
192 dev->guest_irq, 1, false);
193 }
194
195 spin_unlock(&dev->intx_mask_lock);
196 }
197
198 static void deassign_guest_irq(struct kvm *kvm,
199 struct kvm_assigned_dev_kernel *assigned_dev)
200 {
201 if (assigned_dev->ack_notifier.gsi != -1)
202 kvm_unregister_irq_ack_notifier(kvm,
203 &assigned_dev->ack_notifier);
204
205 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
206 assigned_dev->guest_irq, 0, false);
207
208 if (assigned_dev->irq_source_id != -1)
209 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
210 assigned_dev->irq_source_id = -1;
211 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
212 }
213
214 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
215 static void deassign_host_irq(struct kvm *kvm,
216 struct kvm_assigned_dev_kernel *assigned_dev)
217 {
218 /*
219 * We disable irq here to prevent further events.
220 *
221 * Notice this maybe result in nested disable if the interrupt type is
222 * INTx, but it's OK for we are going to free it.
223 *
224 * If this function is a part of VM destroy, please ensure that till
225 * now, the kvm state is still legal for probably we also have to wait
226 * on a currently running IRQ handler.
227 */
228 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
229 int i;
230 for (i = 0; i < assigned_dev->entries_nr; i++)
231 disable_irq(assigned_dev->host_msix_entries[i].vector);
232
233 for (i = 0; i < assigned_dev->entries_nr; i++)
234 free_irq(assigned_dev->host_msix_entries[i].vector,
235 assigned_dev);
236
237 assigned_dev->entries_nr = 0;
238 kfree(assigned_dev->host_msix_entries);
239 kfree(assigned_dev->guest_msix_entries);
240 pci_disable_msix(assigned_dev->dev);
241 } else {
242 /* Deal with MSI and INTx */
243 if ((assigned_dev->irq_requested_type &
244 KVM_DEV_IRQ_HOST_INTX) &&
245 (assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
246 spin_lock_irq(&assigned_dev->intx_lock);
247 pci_intx(assigned_dev->dev, false);
248 spin_unlock_irq(&assigned_dev->intx_lock);
249 synchronize_irq(assigned_dev->host_irq);
250 } else
251 disable_irq(assigned_dev->host_irq);
252
253 free_irq(assigned_dev->host_irq, assigned_dev);
254
255 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
256 pci_disable_msi(assigned_dev->dev);
257 }
258
259 assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
260 }
261
262 static int kvm_deassign_irq(struct kvm *kvm,
263 struct kvm_assigned_dev_kernel *assigned_dev,
264 unsigned long irq_requested_type)
265 {
266 unsigned long guest_irq_type, host_irq_type;
267
268 if (!irqchip_in_kernel(kvm))
269 return -EINVAL;
270 /* no irq assignment to deassign */
271 if (!assigned_dev->irq_requested_type)
272 return -ENXIO;
273
274 host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
275 guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
276
277 if (host_irq_type)
278 deassign_host_irq(kvm, assigned_dev);
279 if (guest_irq_type)
280 deassign_guest_irq(kvm, assigned_dev);
281
282 return 0;
283 }
284
285 static void kvm_free_assigned_irq(struct kvm *kvm,
286 struct kvm_assigned_dev_kernel *assigned_dev)
287 {
288 kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
289 }
290
291 static void kvm_free_assigned_device(struct kvm *kvm,
292 struct kvm_assigned_dev_kernel
293 *assigned_dev)
294 {
295 kvm_free_assigned_irq(kvm, assigned_dev);
296
297 pci_reset_function(assigned_dev->dev);
298 if (pci_load_and_free_saved_state(assigned_dev->dev,
299 &assigned_dev->pci_saved_state))
300 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
301 __func__, dev_name(&assigned_dev->dev->dev));
302 else
303 pci_restore_state(assigned_dev->dev);
304
305 assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
306
307 pci_release_regions(assigned_dev->dev);
308 pci_disable_device(assigned_dev->dev);
309 pci_dev_put(assigned_dev->dev);
310
311 list_del(&assigned_dev->list);
312 kfree(assigned_dev);
313 }
314
315 void kvm_free_all_assigned_devices(struct kvm *kvm)
316 {
317 struct list_head *ptr, *ptr2;
318 struct kvm_assigned_dev_kernel *assigned_dev;
319
320 list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
321 assigned_dev = list_entry(ptr,
322 struct kvm_assigned_dev_kernel,
323 list);
324
325 kvm_free_assigned_device(kvm, assigned_dev);
326 }
327 }
328
329 static int assigned_device_enable_host_intx(struct kvm *kvm,
330 struct kvm_assigned_dev_kernel *dev)
331 {
332 irq_handler_t irq_handler;
333 unsigned long flags;
334
335 dev->host_irq = dev->dev->irq;
336
337 /*
338 * We can only share the IRQ line with other host devices if we are
339 * able to disable the IRQ source at device-level - independently of
340 * the guest driver. Otherwise host devices may suffer from unbounded
341 * IRQ latencies when the guest keeps the line asserted.
342 */
343 if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
344 irq_handler = kvm_assigned_dev_intx;
345 flags = IRQF_SHARED;
346 } else {
347 irq_handler = NULL;
348 flags = IRQF_ONESHOT;
349 }
350 if (request_threaded_irq(dev->host_irq, irq_handler,
351 kvm_assigned_dev_thread_intx, flags,
352 dev->irq_name, dev))
353 return -EIO;
354
355 if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) {
356 spin_lock_irq(&dev->intx_lock);
357 pci_intx(dev->dev, true);
358 spin_unlock_irq(&dev->intx_lock);
359 }
360 return 0;
361 }
362
363 #ifdef __KVM_HAVE_MSI
364 static int assigned_device_enable_host_msi(struct kvm *kvm,
365 struct kvm_assigned_dev_kernel *dev)
366 {
367 int r;
368
369 if (!dev->dev->msi_enabled) {
370 r = pci_enable_msi(dev->dev);
371 if (r)
372 return r;
373 }
374
375 dev->host_irq = dev->dev->irq;
376 if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,
377 kvm_assigned_dev_thread_msi, 0,
378 dev->irq_name, dev)) {
379 pci_disable_msi(dev->dev);
380 return -EIO;
381 }
382
383 return 0;
384 }
385 #endif
386
387 #ifdef __KVM_HAVE_MSIX
388 static int assigned_device_enable_host_msix(struct kvm *kvm,
389 struct kvm_assigned_dev_kernel *dev)
390 {
391 int i, r = -EINVAL;
392
393 /* host_msix_entries and guest_msix_entries should have been
394 * initialized */
395 if (dev->entries_nr == 0)
396 return r;
397
398 r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
399 if (r)
400 return r;
401
402 for (i = 0; i < dev->entries_nr; i++) {
403 r = request_threaded_irq(dev->host_msix_entries[i].vector,
404 kvm_assigned_dev_msix,
405 kvm_assigned_dev_thread_msix,
406 0, dev->irq_name, dev);
407 if (r)
408 goto err;
409 }
410
411 return 0;
412 err:
413 for (i -= 1; i >= 0; i--)
414 free_irq(dev->host_msix_entries[i].vector, dev);
415 pci_disable_msix(dev->dev);
416 return r;
417 }
418
419 #endif
420
421 static int assigned_device_enable_guest_intx(struct kvm *kvm,
422 struct kvm_assigned_dev_kernel *dev,
423 struct kvm_assigned_irq *irq)
424 {
425 dev->guest_irq = irq->guest_irq;
426 dev->ack_notifier.gsi = irq->guest_irq;
427 return 0;
428 }
429
430 #ifdef __KVM_HAVE_MSI
431 static int assigned_device_enable_guest_msi(struct kvm *kvm,
432 struct kvm_assigned_dev_kernel *dev,
433 struct kvm_assigned_irq *irq)
434 {
435 dev->guest_irq = irq->guest_irq;
436 dev->ack_notifier.gsi = -1;
437 return 0;
438 }
439 #endif
440
441 #ifdef __KVM_HAVE_MSIX
442 static int assigned_device_enable_guest_msix(struct kvm *kvm,
443 struct kvm_assigned_dev_kernel *dev,
444 struct kvm_assigned_irq *irq)
445 {
446 dev->guest_irq = irq->guest_irq;
447 dev->ack_notifier.gsi = -1;
448 return 0;
449 }
450 #endif
451
452 static int assign_host_irq(struct kvm *kvm,
453 struct kvm_assigned_dev_kernel *dev,
454 __u32 host_irq_type)
455 {
456 int r = -EEXIST;
457
458 if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
459 return r;
460
461 snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
462 pci_name(dev->dev));
463
464 switch (host_irq_type) {
465 case KVM_DEV_IRQ_HOST_INTX:
466 r = assigned_device_enable_host_intx(kvm, dev);
467 break;
468 #ifdef __KVM_HAVE_MSI
469 case KVM_DEV_IRQ_HOST_MSI:
470 r = assigned_device_enable_host_msi(kvm, dev);
471 break;
472 #endif
473 #ifdef __KVM_HAVE_MSIX
474 case KVM_DEV_IRQ_HOST_MSIX:
475 r = assigned_device_enable_host_msix(kvm, dev);
476 break;
477 #endif
478 default:
479 r = -EINVAL;
480 }
481 dev->host_irq_disabled = false;
482
483 if (!r)
484 dev->irq_requested_type |= host_irq_type;
485
486 return r;
487 }
488
489 static int assign_guest_irq(struct kvm *kvm,
490 struct kvm_assigned_dev_kernel *dev,
491 struct kvm_assigned_irq *irq,
492 unsigned long guest_irq_type)
493 {
494 int id;
495 int r = -EEXIST;
496
497 if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
498 return r;
499
500 id = kvm_request_irq_source_id(kvm);
501 if (id < 0)
502 return id;
503
504 dev->irq_source_id = id;
505
506 switch (guest_irq_type) {
507 case KVM_DEV_IRQ_GUEST_INTX:
508 r = assigned_device_enable_guest_intx(kvm, dev, irq);
509 break;
510 #ifdef __KVM_HAVE_MSI
511 case KVM_DEV_IRQ_GUEST_MSI:
512 r = assigned_device_enable_guest_msi(kvm, dev, irq);
513 break;
514 #endif
515 #ifdef __KVM_HAVE_MSIX
516 case KVM_DEV_IRQ_GUEST_MSIX:
517 r = assigned_device_enable_guest_msix(kvm, dev, irq);
518 break;
519 #endif
520 default:
521 r = -EINVAL;
522 }
523
524 if (!r) {
525 dev->irq_requested_type |= guest_irq_type;
526 if (dev->ack_notifier.gsi != -1)
527 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
528 } else
529 kvm_free_irq_source_id(kvm, dev->irq_source_id);
530
531 return r;
532 }
533
534 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
535 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
536 struct kvm_assigned_irq *assigned_irq)
537 {
538 int r = -EINVAL;
539 struct kvm_assigned_dev_kernel *match;
540 unsigned long host_irq_type, guest_irq_type;
541
542 if (!irqchip_in_kernel(kvm))
543 return r;
544
545 mutex_lock(&kvm->lock);
546 r = -ENODEV;
547 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
548 assigned_irq->assigned_dev_id);
549 if (!match)
550 goto out;
551
552 host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
553 guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
554
555 r = -EINVAL;
556 /* can only assign one type at a time */
557 if (hweight_long(host_irq_type) > 1)
558 goto out;
559 if (hweight_long(guest_irq_type) > 1)
560 goto out;
561 if (host_irq_type == 0 && guest_irq_type == 0)
562 goto out;
563
564 r = 0;
565 if (host_irq_type)
566 r = assign_host_irq(kvm, match, host_irq_type);
567 if (r)
568 goto out;
569
570 if (guest_irq_type)
571 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
572 out:
573 mutex_unlock(&kvm->lock);
574 return r;
575 }
576
577 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
578 struct kvm_assigned_irq
579 *assigned_irq)
580 {
581 int r = -ENODEV;
582 struct kvm_assigned_dev_kernel *match;
583 unsigned long irq_type;
584
585 mutex_lock(&kvm->lock);
586
587 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
588 assigned_irq->assigned_dev_id);
589 if (!match)
590 goto out;
591
592 irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
593 KVM_DEV_IRQ_GUEST_MASK);
594 r = kvm_deassign_irq(kvm, match, irq_type);
595 out:
596 mutex_unlock(&kvm->lock);
597 return r;
598 }
599
600 /*
601 * We want to test whether the caller has been granted permissions to
602 * use this device. To be able to configure and control the device,
603 * the user needs access to PCI configuration space and BAR resources.
604 * These are accessed through PCI sysfs. PCI config space is often
605 * passed to the process calling this ioctl via file descriptor, so we
606 * can't rely on access to that file. We can check for permissions
607 * on each of the BAR resource files, which is a pretty clear
608 * indicator that the user has been granted access to the device.
609 */
610 static int probe_sysfs_permissions(struct pci_dev *dev)
611 {
612 #ifdef CONFIG_SYSFS
613 int i;
614 bool bar_found = false;
615
616 for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
617 char *kpath, *syspath;
618 struct path path;
619 struct inode *inode;
620 int r;
621
622 if (!pci_resource_len(dev, i))
623 continue;
624
625 kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
626 if (!kpath)
627 return -ENOMEM;
628
629 /* Per sysfs-rules, sysfs is always at /sys */
630 syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
631 kfree(kpath);
632 if (!syspath)
633 return -ENOMEM;
634
635 r = kern_path(syspath, LOOKUP_FOLLOW, &path);
636 kfree(syspath);
637 if (r)
638 return r;
639
640 inode = path.dentry->d_inode;
641
642 r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
643 path_put(&path);
644 if (r)
645 return r;
646
647 bar_found = true;
648 }
649
650 /* If no resources, probably something special */
651 if (!bar_found)
652 return -EPERM;
653
654 return 0;
655 #else
656 return -EINVAL; /* No way to control the device without sysfs */
657 #endif
658 }
659
660 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
661 struct kvm_assigned_pci_dev *assigned_dev)
662 {
663 int r = 0, idx;
664 struct kvm_assigned_dev_kernel *match;
665 struct pci_dev *dev;
666
667 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
668 return -EINVAL;
669
670 mutex_lock(&kvm->lock);
671 idx = srcu_read_lock(&kvm->srcu);
672
673 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
674 assigned_dev->assigned_dev_id);
675 if (match) {
676 /* device already assigned */
677 r = -EEXIST;
678 goto out;
679 }
680
681 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
682 if (match == NULL) {
683 printk(KERN_INFO "%s: Couldn't allocate memory\n",
684 __func__);
685 r = -ENOMEM;
686 goto out;
687 }
688 dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
689 assigned_dev->busnr,
690 assigned_dev->devfn);
691 if (!dev) {
692 printk(KERN_INFO "%s: host device not found\n", __func__);
693 r = -EINVAL;
694 goto out_free;
695 }
696
697 /* Don't allow bridges to be assigned */
698 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
699 r = -EPERM;
700 goto out_put;
701 }
702
703 r = probe_sysfs_permissions(dev);
704 if (r)
705 goto out_put;
706
707 if (pci_enable_device(dev)) {
708 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
709 r = -EBUSY;
710 goto out_put;
711 }
712 r = pci_request_regions(dev, "kvm_assigned_device");
713 if (r) {
714 printk(KERN_INFO "%s: Could not get access to device regions\n",
715 __func__);
716 goto out_disable;
717 }
718
719 pci_reset_function(dev);
720 pci_save_state(dev);
721 match->pci_saved_state = pci_store_saved_state(dev);
722 if (!match->pci_saved_state)
723 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
724 __func__, dev_name(&dev->dev));
725
726 if (!pci_intx_mask_supported(dev))
727 assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
728
729 match->assigned_dev_id = assigned_dev->assigned_dev_id;
730 match->host_segnr = assigned_dev->segnr;
731 match->host_busnr = assigned_dev->busnr;
732 match->host_devfn = assigned_dev->devfn;
733 match->flags = assigned_dev->flags;
734 match->dev = dev;
735 spin_lock_init(&match->intx_lock);
736 spin_lock_init(&match->intx_mask_lock);
737 match->irq_source_id = -1;
738 match->kvm = kvm;
739 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
740
741 list_add(&match->list, &kvm->arch.assigned_dev_head);
742
743 if (!kvm->arch.iommu_domain) {
744 r = kvm_iommu_map_guest(kvm);
745 if (r)
746 goto out_list_del;
747 }
748 r = kvm_assign_device(kvm, match);
749 if (r)
750 goto out_list_del;
751
752 out:
753 srcu_read_unlock(&kvm->srcu, idx);
754 mutex_unlock(&kvm->lock);
755 return r;
756 out_list_del:
757 if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
758 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
759 __func__, dev_name(&dev->dev));
760 list_del(&match->list);
761 pci_release_regions(dev);
762 out_disable:
763 pci_disable_device(dev);
764 out_put:
765 pci_dev_put(dev);
766 out_free:
767 kfree(match);
768 srcu_read_unlock(&kvm->srcu, idx);
769 mutex_unlock(&kvm->lock);
770 return r;
771 }
772
773 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
774 struct kvm_assigned_pci_dev *assigned_dev)
775 {
776 int r = 0;
777 struct kvm_assigned_dev_kernel *match;
778
779 mutex_lock(&kvm->lock);
780
781 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
782 assigned_dev->assigned_dev_id);
783 if (!match) {
784 printk(KERN_INFO "%s: device hasn't been assigned before, "
785 "so cannot be deassigned\n", __func__);
786 r = -EINVAL;
787 goto out;
788 }
789
790 kvm_deassign_device(kvm, match);
791
792 kvm_free_assigned_device(kvm, match);
793
794 out:
795 mutex_unlock(&kvm->lock);
796 return r;
797 }
798
799
800 #ifdef __KVM_HAVE_MSIX
801 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
802 struct kvm_assigned_msix_nr *entry_nr)
803 {
804 int r = 0;
805 struct kvm_assigned_dev_kernel *adev;
806
807 mutex_lock(&kvm->lock);
808
809 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
810 entry_nr->assigned_dev_id);
811 if (!adev) {
812 r = -EINVAL;
813 goto msix_nr_out;
814 }
815
816 if (adev->entries_nr == 0) {
817 adev->entries_nr = entry_nr->entry_nr;
818 if (adev->entries_nr == 0 ||
819 adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
820 r = -EINVAL;
821 goto msix_nr_out;
822 }
823
824 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
825 entry_nr->entry_nr,
826 GFP_KERNEL);
827 if (!adev->host_msix_entries) {
828 r = -ENOMEM;
829 goto msix_nr_out;
830 }
831 adev->guest_msix_entries =
832 kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
833 GFP_KERNEL);
834 if (!adev->guest_msix_entries) {
835 kfree(adev->host_msix_entries);
836 r = -ENOMEM;
837 goto msix_nr_out;
838 }
839 } else /* Not allowed set MSI-X number twice */
840 r = -EINVAL;
841 msix_nr_out:
842 mutex_unlock(&kvm->lock);
843 return r;
844 }
845
846 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
847 struct kvm_assigned_msix_entry *entry)
848 {
849 int r = 0, i;
850 struct kvm_assigned_dev_kernel *adev;
851
852 mutex_lock(&kvm->lock);
853
854 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
855 entry->assigned_dev_id);
856
857 if (!adev) {
858 r = -EINVAL;
859 goto msix_entry_out;
860 }
861
862 for (i = 0; i < adev->entries_nr; i++)
863 if (adev->guest_msix_entries[i].vector == 0 ||
864 adev->guest_msix_entries[i].entry == entry->entry) {
865 adev->guest_msix_entries[i].entry = entry->entry;
866 adev->guest_msix_entries[i].vector = entry->gsi;
867 adev->host_msix_entries[i].entry = entry->entry;
868 break;
869 }
870 if (i == adev->entries_nr) {
871 r = -ENOSPC;
872 goto msix_entry_out;
873 }
874
875 msix_entry_out:
876 mutex_unlock(&kvm->lock);
877
878 return r;
879 }
880 #endif
881
882 static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
883 struct kvm_assigned_pci_dev *assigned_dev)
884 {
885 int r = 0;
886 struct kvm_assigned_dev_kernel *match;
887
888 mutex_lock(&kvm->lock);
889
890 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
891 assigned_dev->assigned_dev_id);
892 if (!match) {
893 r = -ENODEV;
894 goto out;
895 }
896
897 spin_lock(&match->intx_mask_lock);
898
899 match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
900 match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
901
902 if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
903 if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
904 kvm_set_irq(match->kvm, match->irq_source_id,
905 match->guest_irq, 0, false);
906 /*
907 * Masking at hardware-level is performed on demand,
908 * i.e. when an IRQ actually arrives at the host.
909 */
910 } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
911 /*
912 * Unmask the IRQ line if required. Unmasking at
913 * device level will be performed by user space.
914 */
915 spin_lock_irq(&match->intx_lock);
916 if (match->host_irq_disabled) {
917 enable_irq(match->host_irq);
918 match->host_irq_disabled = false;
919 }
920 spin_unlock_irq(&match->intx_lock);
921 }
922 }
923
924 spin_unlock(&match->intx_mask_lock);
925
926 out:
927 mutex_unlock(&kvm->lock);
928 return r;
929 }
930
931 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
932 unsigned long arg)
933 {
934 void __user *argp = (void __user *)arg;
935 int r;
936
937 switch (ioctl) {
938 case KVM_ASSIGN_PCI_DEVICE: {
939 struct kvm_assigned_pci_dev assigned_dev;
940
941 r = -EFAULT;
942 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
943 goto out;
944 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
945 if (r)
946 goto out;
947 break;
948 }
949 case KVM_ASSIGN_IRQ: {
950 r = -EOPNOTSUPP;
951 break;
952 }
953 case KVM_ASSIGN_DEV_IRQ: {
954 struct kvm_assigned_irq assigned_irq;
955
956 r = -EFAULT;
957 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
958 goto out;
959 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
960 if (r)
961 goto out;
962 break;
963 }
964 case KVM_DEASSIGN_DEV_IRQ: {
965 struct kvm_assigned_irq assigned_irq;
966
967 r = -EFAULT;
968 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
969 goto out;
970 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
971 if (r)
972 goto out;
973 break;
974 }
975 case KVM_DEASSIGN_PCI_DEVICE: {
976 struct kvm_assigned_pci_dev assigned_dev;
977
978 r = -EFAULT;
979 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
980 goto out;
981 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
982 if (r)
983 goto out;
984 break;
985 }
986 #ifdef __KVM_HAVE_MSIX
987 case KVM_ASSIGN_SET_MSIX_NR: {
988 struct kvm_assigned_msix_nr entry_nr;
989 r = -EFAULT;
990 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
991 goto out;
992 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
993 if (r)
994 goto out;
995 break;
996 }
997 case KVM_ASSIGN_SET_MSIX_ENTRY: {
998 struct kvm_assigned_msix_entry entry;
999 r = -EFAULT;
1000 if (copy_from_user(&entry, argp, sizeof entry))
1001 goto out;
1002 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
1003 if (r)
1004 goto out;
1005 break;
1006 }
1007 #endif
1008 case KVM_ASSIGN_SET_INTX_MASK: {
1009 struct kvm_assigned_pci_dev assigned_dev;
1010
1011 r = -EFAULT;
1012 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1013 goto out;
1014 r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
1015 break;
1016 }
1017 default:
1018 r = -ENOTTY;
1019 break;
1020 }
1021 out:
1022 return r;
1023 }
1024
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