KVM: remove CAP_SYS_RAWIO requirement from kvm_vm_ioctl_assign_irq
[linux-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                 if (r)
320                         goto err;
321         }
322
323         return 0;
324 err:
325         for (i -= 1; i >= 0; i--)
326                 free_irq(dev->host_msix_entries[i].vector, (void *)dev);
327         pci_disable_msix(dev->dev);
328         return r;
329 }
330
331 #endif
332
333 static int assigned_device_enable_guest_intx(struct kvm *kvm,
334                                 struct kvm_assigned_dev_kernel *dev,
335                                 struct kvm_assigned_irq *irq)
336 {
337         dev->guest_irq = irq->guest_irq;
338         dev->ack_notifier.gsi = irq->guest_irq;
339         return 0;
340 }
341
342 #ifdef __KVM_HAVE_MSI
343 static int assigned_device_enable_guest_msi(struct kvm *kvm,
344                         struct kvm_assigned_dev_kernel *dev,
345                         struct kvm_assigned_irq *irq)
346 {
347         dev->guest_irq = irq->guest_irq;
348         dev->ack_notifier.gsi = -1;
349         dev->host_irq_disabled = false;
350         return 0;
351 }
352 #endif
353
354 #ifdef __KVM_HAVE_MSIX
355 static int assigned_device_enable_guest_msix(struct kvm *kvm,
356                         struct kvm_assigned_dev_kernel *dev,
357                         struct kvm_assigned_irq *irq)
358 {
359         dev->guest_irq = irq->guest_irq;
360         dev->ack_notifier.gsi = -1;
361         dev->host_irq_disabled = false;
362         return 0;
363 }
364 #endif
365
366 static int assign_host_irq(struct kvm *kvm,
367                            struct kvm_assigned_dev_kernel *dev,
368                            __u32 host_irq_type)
369 {
370         int r = -EEXIST;
371
372         if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
373                 return r;
374
375         switch (host_irq_type) {
376         case KVM_DEV_IRQ_HOST_INTX:
377                 r = assigned_device_enable_host_intx(kvm, dev);
378                 break;
379 #ifdef __KVM_HAVE_MSI
380         case KVM_DEV_IRQ_HOST_MSI:
381                 r = assigned_device_enable_host_msi(kvm, dev);
382                 break;
383 #endif
384 #ifdef __KVM_HAVE_MSIX
385         case KVM_DEV_IRQ_HOST_MSIX:
386                 r = assigned_device_enable_host_msix(kvm, dev);
387                 break;
388 #endif
389         default:
390                 r = -EINVAL;
391         }
392
393         if (!r)
394                 dev->irq_requested_type |= host_irq_type;
395
396         return r;
397 }
398
399 static int assign_guest_irq(struct kvm *kvm,
400                             struct kvm_assigned_dev_kernel *dev,
401                             struct kvm_assigned_irq *irq,
402                             unsigned long guest_irq_type)
403 {
404         int id;
405         int r = -EEXIST;
406
407         if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
408                 return r;
409
410         id = kvm_request_irq_source_id(kvm);
411         if (id < 0)
412                 return id;
413
414         dev->irq_source_id = id;
415
416         switch (guest_irq_type) {
417         case KVM_DEV_IRQ_GUEST_INTX:
418                 r = assigned_device_enable_guest_intx(kvm, dev, irq);
419                 break;
420 #ifdef __KVM_HAVE_MSI
421         case KVM_DEV_IRQ_GUEST_MSI:
422                 r = assigned_device_enable_guest_msi(kvm, dev, irq);
423                 break;
424 #endif
425 #ifdef __KVM_HAVE_MSIX
426         case KVM_DEV_IRQ_GUEST_MSIX:
427                 r = assigned_device_enable_guest_msix(kvm, dev, irq);
428                 break;
429 #endif
430         default:
431                 r = -EINVAL;
432         }
433
434         if (!r) {
435                 dev->irq_requested_type |= guest_irq_type;
436                 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
437         } else
438                 kvm_free_irq_source_id(kvm, dev->irq_source_id);
439
440         return r;
441 }
442
443 /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
444 static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
445                                    struct kvm_assigned_irq *assigned_irq)
446 {
447         int r = -EINVAL;
448         struct kvm_assigned_dev_kernel *match;
449         unsigned long host_irq_type, guest_irq_type;
450
451         if (!irqchip_in_kernel(kvm))
452                 return r;
453
454         mutex_lock(&kvm->lock);
455         r = -ENODEV;
456         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
457                                       assigned_irq->assigned_dev_id);
458         if (!match)
459                 goto out;
460
461         host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
462         guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
463
464         r = -EINVAL;
465         /* can only assign one type at a time */
466         if (hweight_long(host_irq_type) > 1)
467                 goto out;
468         if (hweight_long(guest_irq_type) > 1)
469                 goto out;
470         if (host_irq_type == 0 && guest_irq_type == 0)
471                 goto out;
472
473         r = 0;
474         if (host_irq_type)
475                 r = assign_host_irq(kvm, match, host_irq_type);
476         if (r)
477                 goto out;
478
479         if (guest_irq_type)
480                 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
481 out:
482         mutex_unlock(&kvm->lock);
483         return r;
484 }
485
486 static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
487                                          struct kvm_assigned_irq
488                                          *assigned_irq)
489 {
490         int r = -ENODEV;
491         struct kvm_assigned_dev_kernel *match;
492
493         mutex_lock(&kvm->lock);
494
495         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
496                                       assigned_irq->assigned_dev_id);
497         if (!match)
498                 goto out;
499
500         r = kvm_deassign_irq(kvm, match, assigned_irq->flags);
501 out:
502         mutex_unlock(&kvm->lock);
503         return r;
504 }
505
506 static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
507                                       struct kvm_assigned_pci_dev *assigned_dev)
508 {
509         int r = 0, idx;
510         struct kvm_assigned_dev_kernel *match;
511         struct pci_dev *dev;
512
513         mutex_lock(&kvm->lock);
514         idx = srcu_read_lock(&kvm->srcu);
515
516         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
517                                       assigned_dev->assigned_dev_id);
518         if (match) {
519                 /* device already assigned */
520                 r = -EEXIST;
521                 goto out;
522         }
523
524         match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
525         if (match == NULL) {
526                 printk(KERN_INFO "%s: Couldn't allocate memory\n",
527                        __func__);
528                 r = -ENOMEM;
529                 goto out;
530         }
531         dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
532                                    assigned_dev->busnr,
533                                    assigned_dev->devfn);
534         if (!dev) {
535                 printk(KERN_INFO "%s: host device not found\n", __func__);
536                 r = -EINVAL;
537                 goto out_free;
538         }
539         if (pci_enable_device(dev)) {
540                 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
541                 r = -EBUSY;
542                 goto out_put;
543         }
544         r = pci_request_regions(dev, "kvm_assigned_device");
545         if (r) {
546                 printk(KERN_INFO "%s: Could not get access to device regions\n",
547                        __func__);
548                 goto out_disable;
549         }
550
551         pci_reset_function(dev);
552
553         match->assigned_dev_id = assigned_dev->assigned_dev_id;
554         match->host_segnr = assigned_dev->segnr;
555         match->host_busnr = assigned_dev->busnr;
556         match->host_devfn = assigned_dev->devfn;
557         match->flags = assigned_dev->flags;
558         match->dev = dev;
559         spin_lock_init(&match->assigned_dev_lock);
560         match->irq_source_id = -1;
561         match->kvm = kvm;
562         match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
563         INIT_WORK(&match->interrupt_work,
564                   kvm_assigned_dev_interrupt_work_handler);
565
566         list_add(&match->list, &kvm->arch.assigned_dev_head);
567
568         if (assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU) {
569                 if (!kvm->arch.iommu_domain) {
570                         r = kvm_iommu_map_guest(kvm);
571                         if (r)
572                                 goto out_list_del;
573                 }
574                 r = kvm_assign_device(kvm, match);
575                 if (r)
576                         goto out_list_del;
577         }
578
579 out:
580         srcu_read_unlock(&kvm->srcu, idx);
581         mutex_unlock(&kvm->lock);
582         return r;
583 out_list_del:
584         list_del(&match->list);
585         pci_release_regions(dev);
586 out_disable:
587         pci_disable_device(dev);
588 out_put:
589         pci_dev_put(dev);
590 out_free:
591         kfree(match);
592         srcu_read_unlock(&kvm->srcu, idx);
593         mutex_unlock(&kvm->lock);
594         return r;
595 }
596
597 static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
598                 struct kvm_assigned_pci_dev *assigned_dev)
599 {
600         int r = 0;
601         struct kvm_assigned_dev_kernel *match;
602
603         mutex_lock(&kvm->lock);
604
605         match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
606                                       assigned_dev->assigned_dev_id);
607         if (!match) {
608                 printk(KERN_INFO "%s: device hasn't been assigned before, "
609                   "so cannot be deassigned\n", __func__);
610                 r = -EINVAL;
611                 goto out;
612         }
613
614         if (match->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)
615                 kvm_deassign_device(kvm, match);
616
617         kvm_free_assigned_device(kvm, match);
618
619 out:
620         mutex_unlock(&kvm->lock);
621         return r;
622 }
623
624
625 #ifdef __KVM_HAVE_MSIX
626 static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
627                                     struct kvm_assigned_msix_nr *entry_nr)
628 {
629         int r = 0;
630         struct kvm_assigned_dev_kernel *adev;
631
632         mutex_lock(&kvm->lock);
633
634         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
635                                       entry_nr->assigned_dev_id);
636         if (!adev) {
637                 r = -EINVAL;
638                 goto msix_nr_out;
639         }
640
641         if (adev->entries_nr == 0) {
642                 adev->entries_nr = entry_nr->entry_nr;
643                 if (adev->entries_nr == 0 ||
644                     adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
645                         r = -EINVAL;
646                         goto msix_nr_out;
647                 }
648
649                 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
650                                                 entry_nr->entry_nr,
651                                                 GFP_KERNEL);
652                 if (!adev->host_msix_entries) {
653                         r = -ENOMEM;
654                         goto msix_nr_out;
655                 }
656                 adev->guest_msix_entries = kzalloc(
657                                 sizeof(struct kvm_guest_msix_entry) *
658                                 entry_nr->entry_nr, GFP_KERNEL);
659                 if (!adev->guest_msix_entries) {
660                         kfree(adev->host_msix_entries);
661                         r = -ENOMEM;
662                         goto msix_nr_out;
663                 }
664         } else /* Not allowed set MSI-X number twice */
665                 r = -EINVAL;
666 msix_nr_out:
667         mutex_unlock(&kvm->lock);
668         return r;
669 }
670
671 static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
672                                        struct kvm_assigned_msix_entry *entry)
673 {
674         int r = 0, i;
675         struct kvm_assigned_dev_kernel *adev;
676
677         mutex_lock(&kvm->lock);
678
679         adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
680                                       entry->assigned_dev_id);
681
682         if (!adev) {
683                 r = -EINVAL;
684                 goto msix_entry_out;
685         }
686
687         for (i = 0; i < adev->entries_nr; i++)
688                 if (adev->guest_msix_entries[i].vector == 0 ||
689                     adev->guest_msix_entries[i].entry == entry->entry) {
690                         adev->guest_msix_entries[i].entry = entry->entry;
691                         adev->guest_msix_entries[i].vector = entry->gsi;
692                         adev->host_msix_entries[i].entry = entry->entry;
693                         break;
694                 }
695         if (i == adev->entries_nr) {
696                 r = -ENOSPC;
697                 goto msix_entry_out;
698         }
699
700 msix_entry_out:
701         mutex_unlock(&kvm->lock);
702
703         return r;
704 }
705 #endif
706
707 long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
708                                   unsigned long arg)
709 {
710         void __user *argp = (void __user *)arg;
711         int r = -ENOTTY;
712
713         switch (ioctl) {
714         case KVM_ASSIGN_PCI_DEVICE: {
715                 struct kvm_assigned_pci_dev assigned_dev;
716
717                 r = -EFAULT;
718                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
719                         goto out;
720                 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
721                 if (r)
722                         goto out;
723                 break;
724         }
725         case KVM_ASSIGN_IRQ: {
726                 r = -EOPNOTSUPP;
727                 break;
728         }
729 #ifdef KVM_CAP_ASSIGN_DEV_IRQ
730         case KVM_ASSIGN_DEV_IRQ: {
731                 struct kvm_assigned_irq assigned_irq;
732
733                 r = -EFAULT;
734                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
735                         goto out;
736                 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
737                 if (r)
738                         goto out;
739                 break;
740         }
741         case KVM_DEASSIGN_DEV_IRQ: {
742                 struct kvm_assigned_irq assigned_irq;
743
744                 r = -EFAULT;
745                 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
746                         goto out;
747                 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
748                 if (r)
749                         goto out;
750                 break;
751         }
752 #endif
753 #ifdef KVM_CAP_DEVICE_DEASSIGNMENT
754         case KVM_DEASSIGN_PCI_DEVICE: {
755                 struct kvm_assigned_pci_dev assigned_dev;
756
757                 r = -EFAULT;
758                 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
759                         goto out;
760                 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
761                 if (r)
762                         goto out;
763                 break;
764         }
765 #endif
766 #ifdef KVM_CAP_IRQ_ROUTING
767         case KVM_SET_GSI_ROUTING: {
768                 struct kvm_irq_routing routing;
769                 struct kvm_irq_routing __user *urouting;
770                 struct kvm_irq_routing_entry *entries;
771
772                 r = -EFAULT;
773                 if (copy_from_user(&routing, argp, sizeof(routing)))
774                         goto out;
775                 r = -EINVAL;
776                 if (routing.nr >= KVM_MAX_IRQ_ROUTES)
777                         goto out;
778                 if (routing.flags)
779                         goto out;
780                 r = -ENOMEM;
781                 entries = vmalloc(routing.nr * sizeof(*entries));
782                 if (!entries)
783                         goto out;
784                 r = -EFAULT;
785                 urouting = argp;
786                 if (copy_from_user(entries, urouting->entries,
787                                    routing.nr * sizeof(*entries)))
788                         goto out_free_irq_routing;
789                 r = kvm_set_irq_routing(kvm, entries, routing.nr,
790                                         routing.flags);
791         out_free_irq_routing:
792                 vfree(entries);
793                 break;
794         }
795 #endif /* KVM_CAP_IRQ_ROUTING */
796 #ifdef __KVM_HAVE_MSIX
797         case KVM_ASSIGN_SET_MSIX_NR: {
798                 struct kvm_assigned_msix_nr entry_nr;
799                 r = -EFAULT;
800                 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
801                         goto out;
802                 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
803                 if (r)
804                         goto out;
805                 break;
806         }
807         case KVM_ASSIGN_SET_MSIX_ENTRY: {
808                 struct kvm_assigned_msix_entry entry;
809                 r = -EFAULT;
810                 if (copy_from_user(&entry, argp, sizeof entry))
811                         goto out;
812                 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
813                 if (r)
814                         goto out;
815                 break;
816         }
817 #endif
818         }
819 out:
820         return r;
821 }
822