mmap_min_addr check CAP_SYS_RAWIO only for write
[sfrench/cifs-2.6.git] / virt / kvm / assigned-dev.c
1 /*
2  * Kernel-based Virtual Machine - device assignment support
3  *
4  * Copyright (C) 2006-9 Red Hat, Inc
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         struct kvm *kvm;
62         int i;
63
64         assigned_dev = container_of(work, struct kvm_assigned_dev_kernel,
65                                     interrupt_work);
66         kvm = assigned_dev->kvm;
67
68         spin_lock_irq(&assigned_dev->assigned_dev_lock);
69         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
70                 struct kvm_guest_msix_entry *guest_entries =
71                         assigned_dev->guest_msix_entries;
72                 for (i = 0; i < assigned_dev->entries_nr; i++) {
73                         if (!(guest_entries[i].flags &
74                                         KVM_ASSIGNED_MSIX_PENDING))
75                                 continue;
76                         guest_entries[i].flags &= ~KVM_ASSIGNED_MSIX_PENDING;
77                         kvm_set_irq(assigned_dev->kvm,
78                                     assigned_dev->irq_source_id,
79                                     guest_entries[i].vector, 1);
80                 }
81         } else
82                 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
83                             assigned_dev->guest_irq, 1);
84
85         spin_unlock_irq(&assigned_dev->assigned_dev_lock);
86 }
87
88 static irqreturn_t kvm_assigned_dev_intr(int irq, void *dev_id)
89 {
90         unsigned long flags;
91         struct kvm_assigned_dev_kernel *assigned_dev =
92                 (struct kvm_assigned_dev_kernel *) dev_id;
93
94         spin_lock_irqsave(&assigned_dev->assigned_dev_lock, flags);
95         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
96                 int index = find_index_from_host_irq(assigned_dev, irq);
97                 if (index < 0)
98                         goto out;
99                 assigned_dev->guest_msix_entries[index].flags |=
100                         KVM_ASSIGNED_MSIX_PENDING;
101         }
102
103         schedule_work(&assigned_dev->interrupt_work);
104
105         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
106                 disable_irq_nosync(irq);
107                 assigned_dev->host_irq_disabled = true;
108         }
109
110 out:
111         spin_unlock_irqrestore(&assigned_dev->assigned_dev_lock, flags);
112         return IRQ_HANDLED;
113 }
114
115 /* Ack the irq line for an assigned device */
116 static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
117 {
118         struct kvm_assigned_dev_kernel *dev;
119         unsigned long flags;
120
121         if (kian->gsi == -1)
122                 return;
123
124         dev = container_of(kian, struct kvm_assigned_dev_kernel,
125                            ack_notifier);
126
127         kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0);
128
129         /* The guest irq may be shared so this ack may be
130          * from another device.
131          */
132         spin_lock_irqsave(&dev->assigned_dev_lock, flags);
133         if (dev->host_irq_disabled) {
134                 enable_irq(dev->host_irq);
135                 dev->host_irq_disabled = false;
136         }
137         spin_unlock_irqrestore(&dev->assigned_dev_lock, flags);
138 }
139
140 static void deassign_guest_irq(struct kvm *kvm,
141                                struct kvm_assigned_dev_kernel *assigned_dev)
142 {
143         kvm_unregister_irq_ack_notifier(kvm, &assigned_dev->ack_notifier);
144         assigned_dev->ack_notifier.gsi = -1;
145
146         if (assigned_dev->irq_source_id != -1)
147                 kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id);
148         assigned_dev->irq_source_id = -1;
149         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK);
150 }
151
152 /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */
153 static void deassign_host_irq(struct kvm *kvm,
154                               struct kvm_assigned_dev_kernel *assigned_dev)
155 {
156         /*
157          * In kvm_free_device_irq, cancel_work_sync return true if:
158          * 1. work is scheduled, and then cancelled.
159          * 2. work callback is executed.
160          *
161          * The first one ensured that the irq is disabled and no more events
162          * would happen. But for the second one, the irq may be enabled (e.g.
163          * for MSI). So we disable irq here to prevent further events.
164          *
165          * Notice this maybe result in nested disable if the interrupt type is
166          * INTx, but it's OK for we are going to free it.
167          *
168          * If this function is a part of VM destroy, please ensure that till
169          * now, the kvm state is still legal for probably we also have to wait
170          * interrupt_work done.
171          */
172         if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) {
173                 int i;
174                 for (i = 0; i < assigned_dev->entries_nr; i++)
175                         disable_irq_nosync(assigned_dev->
176                                            host_msix_entries[i].vector);
177
178                 cancel_work_sync(&assigned_dev->interrupt_work);
179
180                 for (i = 0; i < assigned_dev->entries_nr; i++)
181                         free_irq(assigned_dev->host_msix_entries[i].vector,
182                                  (void *)assigned_dev);
183
184                 assigned_dev->entries_nr = 0;
185                 kfree(assigned_dev->host_msix_entries);
186                 kfree(assigned_dev->guest_msix_entries);
187                 pci_disable_msix(assigned_dev->dev);
188         } else {
189                 /* Deal with MSI and INTx */
190                 disable_irq_nosync(assigned_dev->host_irq);
191                 cancel_work_sync(&assigned_dev->interrupt_work);
192
193                 free_irq(assigned_dev->host_irq, (void *)assigned_dev);
194
195                 if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI)
196                         pci_disable_msi(assigned_dev->dev);
197         }
198
199         assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK);
200 }
201
202 static int kvm_deassign_irq(struct kvm *kvm,
203                             struct kvm_assigned_dev_kernel *assigned_dev,
204                             unsigned long irq_requested_type)
205 {
206         unsigned long guest_irq_type, host_irq_type;
207
208         if (!irqchip_in_kernel(kvm))
209                 return -EINVAL;
210         /* no irq assignment to deassign */
211         if (!assigned_dev->irq_requested_type)
212                 return -ENXIO;
213
214         host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK;
215         guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK;
216
217         if (host_irq_type)
218                 deassign_host_irq(kvm, assigned_dev);
219         if (guest_irq_type)
220                 deassign_guest_irq(kvm, assigned_dev);
221
222         return 0;
223 }
224
225 static void kvm_free_assigned_irq(struct kvm *kvm,
226                                   struct kvm_assigned_dev_kernel *assigned_dev)
227 {
228         kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
229 }
230
231 static void kvm_free_assigned_device(struct kvm *kvm,
232                                      struct kvm_assigned_dev_kernel
233                                      *assigned_dev)
234 {
235         kvm_free_assigned_irq(kvm, assigned_dev);
236
237         pci_reset_function(assigned_dev->dev);
238
239         pci_release_regions(assigned_dev->dev);
240         pci_disable_device(assigned_dev->dev);
241         pci_dev_put(assigned_dev->dev);
242
243         list_del(&assigned_dev->list);
244         kfree(assigned_dev);
245 }
246
247 void kvm_free_all_assigned_devices(struct kvm *kvm)
248 {
249         struct list_head *ptr, *ptr2;
250         struct kvm_assigned_dev_kernel *assigned_dev;
251
252         list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) {
253                 assigned_dev = list_entry(ptr,
254                                           struct kvm_assigned_dev_kernel,
255                                           list);
256
257                 kvm_free_assigned_device(kvm, assigned_dev);
258         }
259 }
260
261 static int assigned_device_enable_host_intx(struct kvm *kvm,
262                                             struct kvm_assigned_dev_kernel *dev)
263 {
264         dev->host_irq = dev->dev->irq;
265         /* Even though this is PCI, we don't want to use shared
266          * interrupts. Sharing host devices with guest-assigned devices
267          * on the same interrupt line is not a happy situation: there
268          * are going to be long delays in accepting, acking, etc.
269          */
270         if (request_irq(dev->host_irq, kvm_assigned_dev_intr,
271                         0, "kvm_assigned_intx_device", (void *)dev))
272                 return -EIO;
273         return 0;
274 }
275
276 #ifdef __KVM_HAVE_MSI
277 static int assigned_device_enable_host_msi(struct kvm *kvm,
278                                            struct kvm_assigned_dev_kernel *dev)
279 {
280         int r;
281
282         if (!dev->dev->msi_enabled) {
283                 r = pci_enable_msi(dev->dev);
284                 if (r)
285                         return r;
286         }
287
288         dev->host_irq = dev->dev->irq;
289         if (request_irq(dev->host_irq, kvm_assigned_dev_intr, 0,
290                         "kvm_assigned_msi_device", (void *)dev)) {
291                 pci_disable_msi(dev->dev);
292                 return -EIO;
293         }
294
295         return 0;
296 }
297 #endif
298
299 #ifdef __KVM_HAVE_MSIX
300 static int assigned_device_enable_host_msix(struct kvm *kvm,
301                                             struct kvm_assigned_dev_kernel *dev)
302 {
303         int i, r = -EINVAL;
304
305         /* host_msix_entries and guest_msix_entries should have been
306          * initialized */
307         if (dev->entries_nr == 0)
308                 return r;
309
310         r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr);
311         if (r)
312                 return r;
313
314         for (i = 0; i < dev->entries_nr; i++) {
315                 r = request_irq(dev->host_msix_entries[i].vector,
316                                 kvm_assigned_dev_intr, 0,
317                                 "kvm_assigned_msix_device",
318                                 (void *)dev);
319                 /* FIXME: free requested_irq's on failure */
320                 if (r)
321                         return r;
322         }
323
324         return 0;
325 }
326
327 #endif
328
329 static int assigned_device_enable_guest_intx(struct kvm *kvm,
330                                 struct kvm_assigned_dev_kernel *dev,
331                                 struct kvm_assigned_irq *irq)
332 {
333         dev->guest_irq = irq->guest_irq;
334         dev->ack_notifier.gsi = irq->guest_irq;
335         return 0;
336 }
337
338 #ifdef __KVM_HAVE_MSI
339 static int assigned_device_enable_guest_msi(struct kvm *kvm,
340                         struct kvm_assigned_dev_kernel *dev,
341                         struct kvm_assigned_irq *irq)
342 {
343         dev->guest_irq = irq->guest_irq;
344         dev->ack_notifier.gsi = -1;
345         dev->host_irq_disabled = false;
346         return 0;
347 }
348 #endif
349
350 #ifdef __KVM_HAVE_MSIX
351 static int assigned_device_enable_guest_msix(struct kvm *kvm,
352                         struct kvm_assigned_dev_kernel *dev,
353                         struct kvm_assigned_irq *irq)
354 {
355         dev->guest_irq = irq->guest_irq;
356         dev->ack_notifier.gsi = -1;
357         dev->host_irq_disabled = false;
358         return 0;
359 }
360 #endif
361
362 static int assign_host_irq(struct kvm *kvm,
363                            struct kvm_assigned_dev_kernel *dev,
364                            __u32 host_irq_type)
365 {
366         int r = -EEXIST;
367
368         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
369                 return r;
370
371         switch (host_irq_type) {
372         case KVM_DEV_IRQ_HOST_INTX:
373                 r = assigned_device_enable_host_intx(kvm, dev);
374                 break;
375 #ifdef __KVM_HAVE_MSI
376         case KVM_DEV_IRQ_HOST_MSI:
377                 r = assigned_device_enable_host_msi(kvm, dev);
378                 break;
379 #endif
380 #ifdef __KVM_HAVE_MSIX
381         case KVM_DEV_IRQ_HOST_MSIX:
382                 r = assigned_device_enable_host_msix(kvm, dev);
383                 break;
384 #endif
385         default:
386                 r = -EINVAL;
387         }
388
389         if (!r)
390                 dev->irq_requested_type |= host_irq_type;
391
392         return r;
393 }
394
395 static int assign_guest_irq(struct kvm *kvm,
396                             struct kvm_assigned_dev_kernel *dev,
397                             struct kvm_assigned_irq *irq,
398                             unsigned long guest_irq_type)
399 {
400         int id;
401         int r = -EEXIST;
402
403         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
404                 return r;
405
406         id = kvm_request_irq_source_id(kvm);
407         if (id < 0)
408                 return id;
409
410         dev->irq_source_id = id;
411
412         switch (guest_irq_type) {
413         case KVM_DEV_IRQ_GUEST_INTX:
414                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
415                 break;
416 #ifdef __KVM_HAVE_MSI
417         case KVM_DEV_IRQ_GUEST_MSI:
418                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
419                 break;
420 #endif
421 #ifdef __KVM_HAVE_MSIX
422         case KVM_DEV_IRQ_GUEST_MSIX:
423                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
424                 break;
425 #endif
426         default:
427                 r = -EINVAL;
428         }
429
430         if (!r) {
431                 dev->irq_requested_type |= guest_irq_type;
432                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
433         } else
434                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
435
436         return r;
437 }
438
439 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
440 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
441                                    struct kvm_assigned_irq *assigned_irq)
442 {
443         int r = -EINVAL;
444         struct kvm_assigned_dev_kernel *match;
445         unsigned long host_irq_type, guest_irq_type;
446
447         if (!capable(CAP_SYS_RAWIO))
448                 return -EPERM;
449
450         if (!irqchip_in_kernel(kvm))
451                 return r;
452
453         mutex_lock(&kvm->lock);
454         r = -ENODEV;
455         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
456                                       assigned_irq->assigned_dev_id);
457         if (!match)
458                 goto out;
459
460         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
461         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
462
463         r = -EINVAL;
464         /* can only assign one type at a time */
465         if (hweight_long(host_irq_type) > 1)
466                 goto out;
467         if (hweight_long(guest_irq_type) > 1)
468                 goto out;
469         if (host_irq_type == 0 && guest_irq_type == 0)
470                 goto out;
471
472         r = 0;
473         if (host_irq_type)
474                 r = assign_host_irq(kvm, match, host_irq_type);
475         if (r)
476                 goto out;
477
478         if (guest_irq_type)
479                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
480 out:
481         mutex_unlock(&kvm->lock);
482         return r;
483 }
484
485 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
486                                          struct kvm_assigned_irq
487                                          *assigned_irq)
488 {
489         int r = -ENODEV;
490         struct kvm_assigned_dev_kernel *match;
491
492         mutex_lock(&kvm->lock);
493
494         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
495                                       assigned_irq->assigned_dev_id);
496         if (!match)
497                 goto out;
498
499         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
500 out:
501         mutex_unlock(&kvm->lock);
502         return r;
503 }
504
505 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
506                                       struct kvm_assigned_pci_dev *assigned_dev)
507 {
508         int r = 0, idx;
509         struct kvm_assigned_dev_kernel *match;
510         struct pci_dev *dev;
511
512         mutex_lock(&kvm->lock);
513         idx = srcu_read_lock(&kvm->srcu);
514
515         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
516                                       assigned_dev->assigned_dev_id);
517         if (match) {
518                 /* device already assigned */
519                 r = -EEXIST;
520                 goto out;
521         }
522
523         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
524         if (match == NULL) {
525                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
526                        __func__);
527                 r = -ENOMEM;
528                 goto out;
529         }
530         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
531                                    assigned_dev->busnr,
532                                    assigned_dev->devfn);
533         if (!dev) {
534                 printk(KERN_INFO "%s: host device not found\n", __func__);
535                 r = -EINVAL;
536                 goto out_free;
537         }
538         if (pci_enable_device(dev)) {
539                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
540                 r = -EBUSY;
541                 goto out_put;
542         }
543         r = pci_request_regions(dev, "kvm_assigned_device");
544         if (r) {
545                 printk(KERN_INFO "%s: Could not get access to device regions\n",
546                        __func__);
547                 goto out_disable;
548         }
549
550         pci_reset_function(dev);
551
552         match->assigned_dev_id = assigned_dev->assigned_dev_id;
553         match->host_segnr = assigned_dev->segnr;
554         match->host_busnr = assigned_dev->busnr;
555         match->host_devfn = assigned_dev->devfn;
556         match->flags = assigned_dev->flags;
557         match->dev = dev;
558         spin_lock_init(&match->assigned_dev_lock);
559         match->irq_source_id = -1;
560         match->kvm = kvm;
561         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
562         INIT_WORK(&match->interrupt_work,
563                   kvm_assigned_dev_interrupt_work_handler);
564
565         list_add(&match->list, &kvm->arch.assigned_dev_head);
566
567         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
568                 if (!kvm->arch.iommu_domain) {
569                         r = kvm_iommu_map_guest(kvm);
570                         if (r)
571                                 goto out_list_del;
572                 }
573                 r = kvm_assign_device(kvm, match);
574                 if (r)
575                         goto out_list_del;
576         }
577
578 out:
579         srcu_read_unlock(&kvm->srcu, idx);
580         mutex_unlock(&kvm->lock);
581         return r;
582 out_list_del:
583         list_del(&match->list);
584         pci_release_regions(dev);
585 out_disable:
586         pci_disable_device(dev);
587 out_put:
588         pci_dev_put(dev);
589 out_free:
590         kfree(match);
591         srcu_read_unlock(&kvm->srcu, idx);
592         mutex_unlock(&kvm->lock);
593         return r;
594 }
595
596 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
597                 struct kvm_assigned_pci_dev *assigned_dev)
598 {
599         int r = 0;
600         struct kvm_assigned_dev_kernel *match;
601
602         mutex_lock(&kvm->lock);
603
604         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
605                                       assigned_dev->assigned_dev_id);
606         if (!match) {
607                 printk(KERN_INFO "%s: device hasn't been assigned before, "
608                   "so cannot be deassigned\n", __func__);
609                 r = -EINVAL;
610                 goto out;
611         }
612
613         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
614                 kvm_deassign_device(kvm, match);
615
616         kvm_free_assigned_device(kvm, match);
617
618 out:
619         mutex_unlock(&kvm->lock);
620         return r;
621 }
622
623
624 #ifdef __KVM_HAVE_MSIX
625 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
626                                     struct kvm_assigned_msix_nr *entry_nr)
627 {
628         int r = 0;
629         struct kvm_assigned_dev_kernel *adev;
630
631         mutex_lock(&kvm->lock);
632
633         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
634                                       entry_nr->assigned_dev_id);
635         if (!adev) {
636                 r = -EINVAL;
637                 goto msix_nr_out;
638         }
639
640         if (adev->entries_nr == 0) {
641                 adev->entries_nr = entry_nr->entry_nr;
642                 if (adev->entries_nr == 0 ||
643                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
644                         r = -EINVAL;
645                         goto msix_nr_out;
646                 }
647
648                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
649                                                 entry_nr->entry_nr,
650                                                 GFP_KERNEL);
651                 if (!adev->host_msix_entries) {
652                         r = -ENOMEM;
653                         goto msix_nr_out;
654                 }
655                 adev->guest_msix_entries = kzalloc(
656                                 sizeof(struct kvm_guest_msix_entry) *
657                                 entry_nr->entry_nr, GFP_KERNEL);
658                 if (!adev->guest_msix_entries) {
659                         kfree(adev->host_msix_entries);
660                         r = -ENOMEM;
661                         goto msix_nr_out;
662                 }
663         } else /* Not allowed set MSI-X number twice */
664                 r = -EINVAL;
665 msix_nr_out:
666         mutex_unlock(&kvm->lock);
667         return r;
668 }
669
670 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
671                                        struct kvm_assigned_msix_entry *entry)
672 {
673         int r = 0, i;
674         struct kvm_assigned_dev_kernel *adev;
675
676         mutex_lock(&kvm->lock);
677
678         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
679                                       entry->assigned_dev_id);
680
681         if (!adev) {
682                 r = -EINVAL;
683                 goto msix_entry_out;
684         }
685
686         for (i = 0; i < adev->entries_nr; i++)
687                 if (adev->guest_msix_entries[i].vector == 0 ||
688                     adev->guest_msix_entries[i].entry == entry->entry) {
689                         adev->guest_msix_entries[i].entry = entry->entry;
690                         adev->guest_msix_entries[i].vector = entry->gsi;
691                         adev->host_msix_entries[i].entry = entry->entry;
692                         break;
693                 }
694         if (i == adev->entries_nr) {
695                 r = -ENOSPC;
696                 goto msix_entry_out;
697         }
698
699 msix_entry_out:
700         mutex_unlock(&kvm->lock);
701
702         return r;
703 }
704 #endif
705
706 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
707                                   unsigned long arg)
708 {
709         void __user *argp = (void __user *)arg;
710         int r = -ENOTTY;
711
712         switch (ioctl) {
713         case KVM_ASSIGN_PCI_DEVICE: {
714                 struct kvm_assigned_pci_dev assigned_dev;
715
716                 r = -EFAULT;
717                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
718                         goto out;
719                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
720                 if (r)
721                         goto out;
722                 break;
723         }
724         case KVM_ASSIGN_IRQ: {
725                 r = -EOPNOTSUPP;
726                 break;
727         }
728 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
729         case KVM_ASSIGN_DEV_IRQ: {
730                 struct kvm_assigned_irq assigned_irq;
731
732                 r = -EFAULT;
733                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
734                         goto out;
735                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
736                 if (r)
737                         goto out;
738                 break;
739         }
740         case KVM_DEASSIGN_DEV_IRQ: {
741                 struct kvm_assigned_irq assigned_irq;
742
743                 r = -EFAULT;
744                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
745                         goto out;
746                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
747                 if (r)
748                         goto out;
749                 break;
750         }
751 #endif
752 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
753         case KVM_DEASSIGN_PCI_DEVICE: {
754                 struct kvm_assigned_pci_dev assigned_dev;
755
756                 r = -EFAULT;
757                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
758                         goto out;
759                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
760                 if (r)
761                         goto out;
762                 break;
763         }
764 #endif
765 #ifdef KVM_CAP_IRQ_ROUTING
766         case KVM_SET_GSI_ROUTING: {
767                 struct kvm_irq_routing routing;
768                 struct kvm_irq_routing __user *urouting;
769                 struct kvm_irq_routing_entry *entries;
770
771                 r = -EFAULT;
772                 if (copy_from_user(&routing, argp, sizeof(routing)))
773                         goto out;
774                 r = -EINVAL;
775                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
776                         goto out;
777                 if (routing.flags)
778                         goto out;
779                 r = -ENOMEM;
780                 entries = vmalloc(routing.nr * sizeof(*entries));
781                 if (!entries)
782                         goto out;
783                 r = -EFAULT;
784                 urouting = argp;
785                 if (copy_from_user(entries, urouting->entries,
786                                    routing.nr * sizeof(*entries)))
787                         goto out_free_irq_routing;
788                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
789                                         routing.flags);
790         out_free_irq_routing:
791                 vfree(entries);
792                 break;
793         }
794 #endif /* KVM_CAP_IRQ_ROUTING */
795 #ifdef __KVM_HAVE_MSIX
796         case KVM_ASSIGN_SET_MSIX_NR: {
797                 struct kvm_assigned_msix_nr entry_nr;
798                 r = -EFAULT;
799                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
800                         goto out;
801                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
802                 if (r)
803                         goto out;
804                 break;
805         }
806         case KVM_ASSIGN_SET_MSIX_ENTRY: {
807                 struct kvm_assigned_msix_entry entry;
808                 r = -EFAULT;
809                 if (copy_from_user(&entry, argp, sizeof entry))
810                         goto out;
811                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
812                 if (r)
813                         goto out;
814                 break;
815         }
816 #endif
817         }
818 out:
819         return r;
820 }
821