KVM: Fix unused but set warnings
[linux-2.6.git] / virt / kvm / assigned-dev.c
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 "irq.h"
21
22 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
23                                                       int assigned_dev_id)
24 {
25         struct list_head *ptr;
26         struct kvm_assigned_dev_kernel *match;
27
28         list_for_each(ptr, head) {
29                 match = list_entry(ptr, struct kvm_assigned_dev_kernel, list);
30                 if (match->assigned_dev_id == assigned_dev_id)
31                         return match;
32         }
33         return NULL;
34 }
35
36 static int find_index_from_host_irq(struct kvm_assigned_dev_kernel
37                                     *assigned_dev, int irq)
38 {
39         int i, index;
40         struct msix_entry *host_msix_entries;
41
42         host_msix_entries = assigned_dev->host_msix_entries;
43
44         index = -1;
45         for (i = 0; i < assigned_dev->entries_nr; i++)
46                 if (irq == host_msix_entries[i].vector) {
47                         index = i;
48                         break;
49                 }
50         if (index < 0) {
51                 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
52                 return 0;
53         }
54
55         return index;
56 }
57
58 static void kvm_assigned_dev_interrupt_work_handler(struct work_struct *work)
59 {
60         struct kvm_assigned_dev_kernel *assigned_dev;
61         int i;
62
63         assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
64                                     interrupt_work);
65
66         spin_lock_irq(&assigned_dev->assigned_dev_lock);
67         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
68                 struct kvm_guest_msix_entry *guest_entries =
69                         assigned_dev->guest_msix_entries;
70                 for (i = 0; i < assigned_dev->entries_nr; i++) {
71                         if (!(guest_entries[i].flags &
72                                         KVM_ASSIGNED_MSIX_PENDING))
73                                 continue;
74                         guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
75                         kvm_set_irq(assigned_dev->kvm,
76                                     assigned_dev->irq_source_id,
77                                     guest_entries[i].vector, 1);
78                 }
79         } else
80                 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
81                             assigned_dev->guest_irq, 1);
82
83         spin_unlock_irq(&assigned_dev->assigned_dev_lock);
84 }
85
86 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
87 {
88         unsigned long flags;
89         struct kvm_assigned_dev_kernel *assigned_dev =
90                 (struct kvm_assigned_dev_kernel *) dev_id;
91
92         spin_lock_irqsave(&assigned_dev->assigned_dev_lock, flags);
93         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
94                 int index = find_index_from_host_irq(assigned_dev, irq);
95                 if (index < 0)
96                         goto out;
97                 assigned_dev->guest_msix_entries[index].flags |=
98                         KVM_ASSIGNED_MSIX_PENDING;
99         }
100
101         schedule_work(&assigned_dev->interrupt_work);
102
103         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
104                 disable_irq_nosync(irq);
105                 assigned_dev->host_irq_disabled = true;
106         }
107
108 out:
109         spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags);
110         return IRQ_HANDLED;
111 }
112
113 /* Ack the irq line for an assigned device */
114 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
115 {
116         struct kvm_assigned_dev_kernel *dev;
117         unsigned long flags;
118
119         if (kian->gsi == -1)
120                 return;
121
122         dev = container_of(kian, struct kvm_assigned_dev_kernel,
123                            ack_notifier);
124
125         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
126
127         /* The guest irq may be shared so this ack may be
128          * from another device.
129          */
130         spin_lock_irqsave(&dev->assigned_dev_lock, flags);
131         if (dev->host_irq_disabled) {
132                 enable_irq(dev->host_irq);
133                 dev->host_irq_disabled = false;
134         }
135         spin_unlock_irqrestore(&dev->assigned_dev_lock, flags);
136 }
137
138 static void deassign_guest_irq(struct kvm *kvm,
139                                struct kvm_assigned_dev_kernel *assigned_dev)
140 {
141         kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
142         assigned_dev->ack_notifier.gsi = -1;
143
144         if (assigned_dev->irq_source_id != -1)
145                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
146         assigned_dev->irq_source_id = -1;
147         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
148 }
149
150 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
151 static void deassign_host_irq(struct kvm *kvm,
152                               struct kvm_assigned_dev_kernel *assigned_dev)
153 {
154         /*
155          * In kvm_free_device_irq, cancel_work_sync return true if:
156          * 1. work is scheduled, and then cancelled.
157          * 2. work callback is executed.
158          *
159          * The first one ensured that the irq is disabled and no more events
160          * would happen. But for the second one, the irq may be enabled (e.g.
161          * for MSI). So we disable irq here to prevent further events.
162          *
163          * Notice this maybe result in nested disable if the interrupt type is
164          * INTx, but it's OK for we are going to free it.
165          *
166          * If this function is a part of VM destroy, please ensure that till
167          * now, the kvm state is still legal for probably we also have to wait
168          * interrupt_work done.
169          */
170         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
171                 int i;
172                 for (i = 0; i < assigned_dev->entries_nr; i++)
173                         disable_irq_nosync(assigned_dev->
174                                            host_msix_entries[i].vector);
175
176                 cancel_work_sync(&assigned_dev->interrupt_work);
177
178                 for (i = 0; i < assigned_dev->entries_nr; i++)
179                         free_irq(assigned_dev->host_msix_entries[i].vector,
180                                  (void *)assigned_dev);
181
182                 assigned_dev->entries_nr = 0;
183                 kfree(assigned_dev->host_msix_entries);
184                 kfree(assigned_dev->guest_msix_entries);
185                 pci_disable_msix(assigned_dev->dev);
186         } else {
187                 /* Deal with MSI and INTx */
188                 disable_irq_nosync(assigned_dev->host_irq);
189                 cancel_work_sync(&assigned_dev->interrupt_work);
190
191                 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
192
193                 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
194                         pci_disable_msi(assigned_dev->dev);
195         }
196
197         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
198 }
199
200 static int kvm_deassign_irq(struct kvm *kvm,
201                             struct kvm_assigned_dev_kernel *assigned_dev,
202                             unsigned long irq_requested_type)
203 {
204         unsigned long guest_irq_type, host_irq_type;
205
206         if (!irqchip_in_kernel(kvm))
207                 return -EINVAL;
208         /* no irq assignment to deassign */
209         if (!assigned_dev->irq_requested_type)
210                 return -ENXIO;
211
212         host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
213         guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
214
215         if (host_irq_type)
216                 deassign_host_irq(kvm, assigned_dev);
217         if (guest_irq_type)
218                 deassign_guest_irq(kvm, assigned_dev);
219
220         return 0;
221 }
222
223 static void kvm_free_assigned_irq(struct kvm *kvm,
224                                   struct kvm_assigned_dev_kernel *assigned_dev)
225 {
226         kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
227 }
228
229 static void kvm_free_assigned_device(struct kvm *kvm,
230                                      struct kvm_assigned_dev_kernel
231                                      *assigned_dev)
232 {
233         kvm_free_assigned_irq(kvm, assigned_dev);
234
235         pci_reset_function(assigned_dev->dev);
236
237         pci_release_regions(assigned_dev->dev);
238         pci_disable_device(assigned_dev->dev);
239         pci_dev_put(assigned_dev->dev);
240
241         list_del(&assigned_dev->list);
242         kfree(assigned_dev);
243 }
244
245 void kvm_free_all_assigned_devices(struct kvm *kvm)
246 {
247         struct list_head *ptr, *ptr2;
248         struct kvm_assigned_dev_kernel *assigned_dev;
249
250         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
251                 assigned_dev = list_entry(ptr,
252                                           struct kvm_assigned_dev_kernel,
253                                           list);
254
255                 kvm_free_assigned_device(kvm, assigned_dev);
256         }
257 }
258
259 static int assigned_device_enable_host_intx(struct kvm *kvm,
260                                             struct kvm_assigned_dev_kernel *dev)
261 {
262         dev->host_irq = dev->dev->irq;
263         /* Even though this is PCI, we don't want to use shared
264          * interrupts. Sharing host devices with guest-assigned devices
265          * on the same interrupt line is not a happy situation: there
266          * are going to be long delays in accepting, acking, etc.
267          */
268         if (request_irq(dev->host_irq, kvm_assigned_dev_intr,
269                         0, "kvm_assigned_intx_device", (void *)dev))
270                 return -EIO;
271         return 0;
272 }
273
274 #ifdef __KVM_HAVE_MSI
275 static int assigned_device_enable_host_msi(struct kvm *kvm,
276                                            struct kvm_assigned_dev_kernel *dev)
277 {
278         int r;
279
280         if (!dev->dev->msi_enabled) {
281                 r = pci_enable_msi(dev->dev);
282                 if (r)
283                         return r;
284         }
285
286         dev->host_irq = dev->dev->irq;
287         if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0,
288                         "kvm_assigned_msi_device", (void *)dev)) {
289                 pci_disable_msi(dev->dev);
290                 return -EIO;
291         }
292
293         return 0;
294 }
295 #endif
296
297 #ifdef __KVM_HAVE_MSIX
298 static int assigned_device_enable_host_msix(struct kvm *kvm,
299                                             struct kvm_assigned_dev_kernel *dev)
300 {
301         int i, r = -EINVAL;
302
303         /* host_msix_entries and guest_msix_entries should have been
304          * initialized */
305         if (dev->entries_nr == 0)
306                 return r;
307
308         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
309         if (r)
310                 return r;
311
312         for (i = 0; i < dev->entries_nr; i++) {
313                 r = request_irq(dev->host_msix_entries[i].vector,
314                                 kvm_assigned_dev_intr, 0,
315                                 "kvm_assigned_msix_device",
316                                 (void *)dev);
317                 if (r)
318                         goto err;
319         }
320
321         return 0;
322 err:
323         for (i -= 1; i >= 0; i--)
324                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
325         pci_disable_msix(dev->dev);
326         return r;
327 }
328
329 #endif
330
331 static int assigned_device_enable_guest_intx(struct kvm *kvm,
332                                 struct kvm_assigned_dev_kernel *dev,
333                                 struct kvm_assigned_irq *irq)
334 {
335         dev->guest_irq = irq->guest_irq;
336         dev->ack_notifier.gsi = irq->guest_irq;
337         return 0;
338 }
339
340 #ifdef __KVM_HAVE_MSI
341 static int assigned_device_enable_guest_msi(struct kvm *kvm,
342                         struct kvm_assigned_dev_kernel *dev,
343                         struct kvm_assigned_irq *irq)
344 {
345         dev->guest_irq = irq->guest_irq;
346         dev->ack_notifier.gsi = -1;
347         dev->host_irq_disabled = false;
348         return 0;
349 }
350 #endif
351
352 #ifdef __KVM_HAVE_MSIX
353 static int assigned_device_enable_guest_msix(struct kvm *kvm,
354                         struct kvm_assigned_dev_kernel *dev,
355                         struct kvm_assigned_irq *irq)
356 {
357         dev->guest_irq = irq->guest_irq;
358         dev->ack_notifier.gsi = -1;
359         dev->host_irq_disabled = false;
360         return 0;
361 }
362 #endif
363
364 static int assign_host_irq(struct kvm *kvm,
365                            struct kvm_assigned_dev_kernel *dev,
366                            __u32 host_irq_type)
367 {
368         int r = -EEXIST;
369
370         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
371                 return r;
372
373         switch (host_irq_type) {
374         case KVM_DEV_IRQ_HOST_INTX:
375                 r = assigned_device_enable_host_intx(kvm, dev);
376                 break;
377 #ifdef __KVM_HAVE_MSI
378         case KVM_DEV_IRQ_HOST_MSI:
379                 r = assigned_device_enable_host_msi(kvm, dev);
380                 break;
381 #endif
382 #ifdef __KVM_HAVE_MSIX
383         case KVM_DEV_IRQ_HOST_MSIX:
384                 r = assigned_device_enable_host_msix(kvm, dev);
385                 break;
386 #endif
387         default:
388                 r = -EINVAL;
389         }
390
391         if (!r)
392                 dev->irq_requested_type |= host_irq_type;
393
394         return r;
395 }
396
397 static int assign_guest_irq(struct kvm *kvm,
398                             struct kvm_assigned_dev_kernel *dev,
399                             struct kvm_assigned_irq *irq,
400                             unsigned long guest_irq_type)
401 {
402         int id;
403         int r = -EEXIST;
404
405         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
406                 return r;
407
408         id = kvm_request_irq_source_id(kvm);
409         if (id < 0)
410                 return id;
411
412         dev->irq_source_id = id;
413
414         switch (guest_irq_type) {
415         case KVM_DEV_IRQ_GUEST_INTX:
416                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
417                 break;
418 #ifdef __KVM_HAVE_MSI
419         case KVM_DEV_IRQ_GUEST_MSI:
420                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
421                 break;
422 #endif
423 #ifdef __KVM_HAVE_MSIX
424         case KVM_DEV_IRQ_GUEST_MSIX:
425                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
426                 break;
427 #endif
428         default:
429                 r = -EINVAL;
430         }
431
432         if (!r) {
433                 dev->irq_requested_type |= guest_irq_type;
434                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
435         } else
436                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
437
438         return r;
439 }
440
441 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
442 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
443                                    struct kvm_assigned_irq *assigned_irq)
444 {
445         int r = -EINVAL;
446         struct kvm_assigned_dev_kernel *match;
447         unsigned long host_irq_type, guest_irq_type;
448
449         if (!irqchip_in_kernel(kvm))
450                 return r;
451
452         mutex_lock(&kvm->lock);
453         r = -ENODEV;
454         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
455                                       assigned_irq->assigned_dev_id);
456         if (!match)
457                 goto out;
458
459         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
460         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
461
462         r = -EINVAL;
463         /* can only assign one type at a time */
464         if (hweight_long(host_irq_type) > 1)
465                 goto out;
466         if (hweight_long(guest_irq_type) > 1)
467                 goto out;
468         if (host_irq_type == 0 && guest_irq_type == 0)
469                 goto out;
470
471         r = 0;
472         if (host_irq_type)
473                 r = assign_host_irq(kvm, match, host_irq_type);
474         if (r)
475                 goto out;
476
477         if (guest_irq_type)
478                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
479 out:
480         mutex_unlock(&kvm->lock);
481         return r;
482 }
483
484 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
485                                          struct kvm_assigned_irq
486                                          *assigned_irq)
487 {
488         int r = -ENODEV;
489         struct kvm_assigned_dev_kernel *match;
490
491         mutex_lock(&kvm->lock);
492
493         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
494                                       assigned_irq->assigned_dev_id);
495         if (!match)
496                 goto out;
497
498         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
499 out:
500         mutex_unlock(&kvm->lock);
501         return r;
502 }
503
504 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
505                                       struct kvm_assigned_pci_dev *assigned_dev)
506 {
507         int r = 0, idx;
508         struct kvm_assigned_dev_kernel *match;
509         struct pci_dev *dev;
510
511         mutex_lock(&kvm->lock);
512         idx = srcu_read_lock(&kvm->srcu);
513
514         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
515                                       assigned_dev->assigned_dev_id);
516         if (match) {
517                 /* device already assigned */
518                 r = -EEXIST;
519                 goto out;
520         }
521
522         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
523         if (match == NULL) {
524                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
525                        __func__);
526                 r = -ENOMEM;
527                 goto out;
528         }
529         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
530                                    assigned_dev->busnr,
531                                    assigned_dev->devfn);
532         if (!dev) {
533                 printk(KERN_INFO "%s: host device not found\n", __func__);
534                 r = -EINVAL;
535                 goto out_free;
536         }
537         if (pci_enable_device(dev)) {
538                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
539                 r = -EBUSY;
540                 goto out_put;
541         }
542         r = pci_request_regions(dev, "kvm_assigned_device");
543         if (r) {
544                 printk(KERN_INFO "%s: Could not get access to device regions\n",
545                        __func__);
546                 goto out_disable;
547         }
548
549         pci_reset_function(dev);
550
551         match->assigned_dev_id = assigned_dev->assigned_dev_id;
552         match->host_segnr = assigned_dev->segnr;
553         match->host_busnr = assigned_dev->busnr;
554         match->host_devfn = assigned_dev->devfn;
555         match->flags = assigned_dev->flags;
556         match->dev = dev;
557         spin_lock_init(&match->assigned_dev_lock);
558         match->irq_source_id = -1;
559         match->kvm = kvm;
560         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
561         INIT_WORK(&match->interrupt_work,
562                   kvm_assigned_dev_interrupt_work_handler);
563
564         list_add(&match->list, &kvm->arch.assigned_dev_head);
565
566         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
567                 if (!kvm->arch.iommu_domain) {
568                         r = kvm_iommu_map_guest(kvm);
569                         if (r)
570                                 goto out_list_del;
571                 }
572                 r = kvm_assign_device(kvm, match);
573                 if (r)
574                         goto out_list_del;
575         }
576
577 out:
578         srcu_read_unlock(&kvm->srcu, idx);
579         mutex_unlock(&kvm->lock);
580         return r;
581 out_list_del:
582         list_del(&match->list);
583         pci_release_regions(dev);
584 out_disable:
585         pci_disable_device(dev);
586 out_put:
587         pci_dev_put(dev);
588 out_free:
589         kfree(match);
590         srcu_read_unlock(&kvm->srcu, idx);
591         mutex_unlock(&kvm->lock);
592         return r;
593 }
594
595 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
596                 struct kvm_assigned_pci_dev *assigned_dev)
597 {
598         int r = 0;
599         struct kvm_assigned_dev_kernel *match;
600
601         mutex_lock(&kvm->lock);
602
603         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
604                                       assigned_dev->assigned_dev_id);
605         if (!match) {
606                 printk(KERN_INFO "%s: device hasn't been assigned before, "
607                   "so cannot be deassigned\n", __func__);
608                 r = -EINVAL;
609                 goto out;
610         }
611
612         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
613                 kvm_deassign_device(kvm, match);
614
615         kvm_free_assigned_device(kvm, match);
616
617 out:
618         mutex_unlock(&kvm->lock);
619         return r;
620 }
621
622
623 #ifdef __KVM_HAVE_MSIX
624 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
625                                     struct kvm_assigned_msix_nr *entry_nr)
626 {
627         int r = 0;
628         struct kvm_assigned_dev_kernel *adev;
629
630         mutex_lock(&kvm->lock);
631
632         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
633                                       entry_nr->assigned_dev_id);
634         if (!adev) {
635                 r = -EINVAL;
636                 goto msix_nr_out;
637         }
638
639         if (adev->entries_nr == 0) {
640                 adev->entries_nr = entry_nr->entry_nr;
641                 if (adev->entries_nr == 0 ||
642                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
643                         r = -EINVAL;
644                         goto msix_nr_out;
645                 }
646
647                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
648                                                 entry_nr->entry_nr,
649                                                 GFP_KERNEL);
650                 if (!adev->host_msix_entries) {
651                         r = -ENOMEM;
652                         goto msix_nr_out;
653                 }
654                 adev->guest_msix_entries = kzalloc(
655                                 sizeof(struct kvm_guest_msix_entry) *
656                                 entry_nr->entry_nr, GFP_KERNEL);
657                 if (!adev->guest_msix_entries) {
658                         kfree(adev->host_msix_entries);
659                         r = -ENOMEM;
660                         goto msix_nr_out;
661                 }
662         } else /* Not allowed set MSI-X number twice */
663                 r = -EINVAL;
664 msix_nr_out:
665         mutex_unlock(&kvm->lock);
666         return r;
667 }
668
669 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
670                                        struct kvm_assigned_msix_entry *entry)
671 {
672         int r = 0, i;
673         struct kvm_assigned_dev_kernel *adev;
674
675         mutex_lock(&kvm->lock);
676
677         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
678                                       entry->assigned_dev_id);
679
680         if (!adev) {
681                 r = -EINVAL;
682                 goto msix_entry_out;
683         }
684
685         for (i = 0; i < adev->entries_nr; i++)
686                 if (adev->guest_msix_entries[i].vector == 0 ||
687                     adev->guest_msix_entries[i].entry == entry->entry) {
688                         adev->guest_msix_entries[i].entry = entry->entry;
689                         adev->guest_msix_entries[i].vector = entry->gsi;
690                         adev->host_msix_entries[i].entry = entry->entry;
691                         break;
692                 }
693         if (i == adev->entries_nr) {
694                 r = -ENOSPC;
695                 goto msix_entry_out;
696         }
697
698 msix_entry_out:
699         mutex_unlock(&kvm->lock);
700
701         return r;
702 }
703 #endif
704
705 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
706                                   unsigned long arg)
707 {
708         void __user *argp = (void __user *)arg;
709         int r = -ENOTTY;
710
711         switch (ioctl) {
712         case KVM_ASSIGN_PCI_DEVICE: {
713                 struct kvm_assigned_pci_dev assigned_dev;
714
715                 r = -EFAULT;
716                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
717                         goto out;
718                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
719                 if (r)
720                         goto out;
721                 break;
722         }
723         case KVM_ASSIGN_IRQ: {
724                 r = -EOPNOTSUPP;
725                 break;
726         }
727 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
728         case KVM_ASSIGN_DEV_IRQ: {
729                 struct kvm_assigned_irq assigned_irq;
730
731                 r = -EFAULT;
732                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
733                         goto out;
734                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
735                 if (r)
736                         goto out;
737                 break;
738         }
739         case KVM_DEASSIGN_DEV_IRQ: {
740                 struct kvm_assigned_irq assigned_irq;
741
742                 r = -EFAULT;
743                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
744                         goto out;
745                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
746                 if (r)
747                         goto out;
748                 break;
749         }
750 #endif
751 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
752         case KVM_DEASSIGN_PCI_DEVICE: {
753                 struct kvm_assigned_pci_dev assigned_dev;
754
755                 r = -EFAULT;
756                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
757                         goto out;
758                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
759                 if (r)
760                         goto out;
761                 break;
762         }
763 #endif
764 #ifdef KVM_CAP_IRQ_ROUTING
765         case KVM_SET_GSI_ROUTING: {
766                 struct kvm_irq_routing routing;
767                 struct kvm_irq_routing __user *urouting;
768                 struct kvm_irq_routing_entry *entries;
769
770                 r = -EFAULT;
771                 if (copy_from_user(&routing, argp, sizeof(routing)))
772                         goto out;
773                 r = -EINVAL;
774                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
775                         goto out;
776                 if (routing.flags)
777                         goto out;
778                 r = -ENOMEM;
779                 entries = vmalloc(routing.nr * sizeof(*entries));
780                 if (!entries)
781                         goto out;
782                 r = -EFAULT;
783                 urouting = argp;
784                 if (copy_from_user(entries, urouting->entries,
785                                    routing.nr * sizeof(*entries)))
786                         goto out_free_irq_routing;
787                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
788                                         routing.flags);
789         out_free_irq_routing:
790                 vfree(entries);
791                 break;
792         }
793 #endif /* KVM_CAP_IRQ_ROUTING */
794 #ifdef __KVM_HAVE_MSIX
795         case KVM_ASSIGN_SET_MSIX_NR: {
796                 struct kvm_assigned_msix_nr entry_nr;
797                 r = -EFAULT;
798                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
799                         goto out;
800                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
801                 if (r)
802                         goto out;
803                 break;
804         }
805         case KVM_ASSIGN_SET_MSIX_ENTRY: {
806                 struct kvm_assigned_msix_entry entry;
807                 r = -EFAULT;
808                 if (copy_from_user(&entry, argp, sizeof entry))
809                         goto out;
810                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
811                 if (r)
812                         goto out;
813                 break;
814         }
815 #endif
816         }
817 out:
818         return r;
819 }
820