aboutsummaryrefslogtreecommitdiffstats
path: root/virt
diff options
context:
space:
mode:
authorRadim Krčmář <rkrcmar@redhat.com>2014-11-21 16:21:50 -0500
committerPaolo Bonzini <pbonzini@redhat.com>2014-11-23 12:33:36 -0500
commitc274e03af70544506cd7214fcc2d4c4376c2c6f4 (patch)
tree1ff3241fbca679739572922c0a040e71aab9e25f /virt
parent6b397158d07f885154b871a15f879d25b3de7579 (diff)
kvm: x86: move assigned-dev.c and iommu.c to arch/x86/
Now that ia64 is gone, we can hide deprecated device assignment in x86. Notable changes: - kvm_vm_ioctl_assigned_device() was moved to x86/kvm_arch_vm_ioctl() The easy parts were removed from generic kvm code, remaining - kvm_iommu_(un)map_pages() would require new code to be moved - struct kvm_assigned_dev_kernel depends on struct kvm_irq_ack_notifier Signed-off-by: Radim Krčmář <rkrcmar@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/assigned-dev.c1026
-rw-r--r--virt/kvm/iommu.c358
-rw-r--r--virt/kvm/kvm_main.c2
3 files changed, 0 insertions, 1386 deletions
diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
deleted file mode 100644
index e05000e200d2..000000000000
--- a/virt/kvm/assigned-dev.c
+++ /dev/null
@@ -1,1026 +0,0 @@
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
24static 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
38static 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
58static 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
74static void
75kvm_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
91static 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
109static 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
118static 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
130static 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
147static 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 */
163static 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
198static 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() */
215static 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
262static 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
285static 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
291static 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 pci_clear_dev_assigned(assigned_dev->dev);
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
315void 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
329static 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
364static 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
388static 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_exact(dev->dev,
399 dev->host_msix_entries, dev->entries_nr);
400 if (r)
401 return r;
402
403 for (i = 0; i < dev->entries_nr; i++) {
404 r = request_threaded_irq(dev->host_msix_entries[i].vector,
405 kvm_assigned_dev_msix,
406 kvm_assigned_dev_thread_msix,
407 0, dev->irq_name, dev);
408 if (r)
409 goto err;
410 }
411
412 return 0;
413err:
414 for (i -= 1; i >= 0; i--)
415 free_irq(dev->host_msix_entries[i].vector, dev);
416 pci_disable_msix(dev->dev);
417 return r;
418}
419
420#endif
421
422static int assigned_device_enable_guest_intx(struct kvm *kvm,
423 struct kvm_assigned_dev_kernel *dev,
424 struct kvm_assigned_irq *irq)
425{
426 dev->guest_irq = irq->guest_irq;
427 dev->ack_notifier.gsi = irq->guest_irq;
428 return 0;
429}
430
431#ifdef __KVM_HAVE_MSI
432static int assigned_device_enable_guest_msi(struct kvm *kvm,
433 struct kvm_assigned_dev_kernel *dev,
434 struct kvm_assigned_irq *irq)
435{
436 dev->guest_irq = irq->guest_irq;
437 dev->ack_notifier.gsi = -1;
438 return 0;
439}
440#endif
441
442#ifdef __KVM_HAVE_MSIX
443static int assigned_device_enable_guest_msix(struct kvm *kvm,
444 struct kvm_assigned_dev_kernel *dev,
445 struct kvm_assigned_irq *irq)
446{
447 dev->guest_irq = irq->guest_irq;
448 dev->ack_notifier.gsi = -1;
449 return 0;
450}
451#endif
452
453static int assign_host_irq(struct kvm *kvm,
454 struct kvm_assigned_dev_kernel *dev,
455 __u32 host_irq_type)
456{
457 int r = -EEXIST;
458
459 if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK)
460 return r;
461
462 snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
463 pci_name(dev->dev));
464
465 switch (host_irq_type) {
466 case KVM_DEV_IRQ_HOST_INTX:
467 r = assigned_device_enable_host_intx(kvm, dev);
468 break;
469#ifdef __KVM_HAVE_MSI
470 case KVM_DEV_IRQ_HOST_MSI:
471 r = assigned_device_enable_host_msi(kvm, dev);
472 break;
473#endif
474#ifdef __KVM_HAVE_MSIX
475 case KVM_DEV_IRQ_HOST_MSIX:
476 r = assigned_device_enable_host_msix(kvm, dev);
477 break;
478#endif
479 default:
480 r = -EINVAL;
481 }
482 dev->host_irq_disabled = false;
483
484 if (!r)
485 dev->irq_requested_type |= host_irq_type;
486
487 return r;
488}
489
490static int assign_guest_irq(struct kvm *kvm,
491 struct kvm_assigned_dev_kernel *dev,
492 struct kvm_assigned_irq *irq,
493 unsigned long guest_irq_type)
494{
495 int id;
496 int r = -EEXIST;
497
498 if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK)
499 return r;
500
501 id = kvm_request_irq_source_id(kvm);
502 if (id < 0)
503 return id;
504
505 dev->irq_source_id = id;
506
507 switch (guest_irq_type) {
508 case KVM_DEV_IRQ_GUEST_INTX:
509 r = assigned_device_enable_guest_intx(kvm, dev, irq);
510 break;
511#ifdef __KVM_HAVE_MSI
512 case KVM_DEV_IRQ_GUEST_MSI:
513 r = assigned_device_enable_guest_msi(kvm, dev, irq);
514 break;
515#endif
516#ifdef __KVM_HAVE_MSIX
517 case KVM_DEV_IRQ_GUEST_MSIX:
518 r = assigned_device_enable_guest_msix(kvm, dev, irq);
519 break;
520#endif
521 default:
522 r = -EINVAL;
523 }
524
525 if (!r) {
526 dev->irq_requested_type |= guest_irq_type;
527 if (dev->ack_notifier.gsi != -1)
528 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
529 } else {
530 kvm_free_irq_source_id(kvm, dev->irq_source_id);
531 dev->irq_source_id = -1;
532 }
533
534 return r;
535}
536
537/* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
538static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
539 struct kvm_assigned_irq *assigned_irq)
540{
541 int r = -EINVAL;
542 struct kvm_assigned_dev_kernel *match;
543 unsigned long host_irq_type, guest_irq_type;
544
545 if (!irqchip_in_kernel(kvm))
546 return r;
547
548 mutex_lock(&kvm->lock);
549 r = -ENODEV;
550 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
551 assigned_irq->assigned_dev_id);
552 if (!match)
553 goto out;
554
555 host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
556 guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
557
558 r = -EINVAL;
559 /* can only assign one type at a time */
560 if (hweight_long(host_irq_type) > 1)
561 goto out;
562 if (hweight_long(guest_irq_type) > 1)
563 goto out;
564 if (host_irq_type == 0 && guest_irq_type == 0)
565 goto out;
566
567 r = 0;
568 if (host_irq_type)
569 r = assign_host_irq(kvm, match, host_irq_type);
570 if (r)
571 goto out;
572
573 if (guest_irq_type)
574 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
575out:
576 mutex_unlock(&kvm->lock);
577 return r;
578}
579
580static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
581 struct kvm_assigned_irq
582 *assigned_irq)
583{
584 int r = -ENODEV;
585 struct kvm_assigned_dev_kernel *match;
586 unsigned long irq_type;
587
588 mutex_lock(&kvm->lock);
589
590 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
591 assigned_irq->assigned_dev_id);
592 if (!match)
593 goto out;
594
595 irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
596 KVM_DEV_IRQ_GUEST_MASK);
597 r = kvm_deassign_irq(kvm, match, irq_type);
598out:
599 mutex_unlock(&kvm->lock);
600 return r;
601}
602
603/*
604 * We want to test whether the caller has been granted permissions to
605 * use this device. To be able to configure and control the device,
606 * the user needs access to PCI configuration space and BAR resources.
607 * These are accessed through PCI sysfs. PCI config space is often
608 * passed to the process calling this ioctl via file descriptor, so we
609 * can't rely on access to that file. We can check for permissions
610 * on each of the BAR resource files, which is a pretty clear
611 * indicator that the user has been granted access to the device.
612 */
613static int probe_sysfs_permissions(struct pci_dev *dev)
614{
615#ifdef CONFIG_SYSFS
616 int i;
617 bool bar_found = false;
618
619 for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
620 char *kpath, *syspath;
621 struct path path;
622 struct inode *inode;
623 int r;
624
625 if (!pci_resource_len(dev, i))
626 continue;
627
628 kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
629 if (!kpath)
630 return -ENOMEM;
631
632 /* Per sysfs-rules, sysfs is always at /sys */
633 syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
634 kfree(kpath);
635 if (!syspath)
636 return -ENOMEM;
637
638 r = kern_path(syspath, LOOKUP_FOLLOW, &path);
639 kfree(syspath);
640 if (r)
641 return r;
642
643 inode = path.dentry->d_inode;
644
645 r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
646 path_put(&path);
647 if (r)
648 return r;
649
650 bar_found = true;
651 }
652
653 /* If no resources, probably something special */
654 if (!bar_found)
655 return -EPERM;
656
657 return 0;
658#else
659 return -EINVAL; /* No way to control the device without sysfs */
660#endif
661}
662
663static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
664 struct kvm_assigned_pci_dev *assigned_dev)
665{
666 int r = 0, idx;
667 struct kvm_assigned_dev_kernel *match;
668 struct pci_dev *dev;
669
670 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
671 return -EINVAL;
672
673 mutex_lock(&kvm->lock);
674 idx = srcu_read_lock(&kvm->srcu);
675
676 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
677 assigned_dev->assigned_dev_id);
678 if (match) {
679 /* device already assigned */
680 r = -EEXIST;
681 goto out;
682 }
683
684 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
685 if (match == NULL) {
686 printk(KERN_INFO "%s: Couldn't allocate memory\n",
687 __func__);
688 r = -ENOMEM;
689 goto out;
690 }
691 dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
692 assigned_dev->busnr,
693 assigned_dev->devfn);
694 if (!dev) {
695 printk(KERN_INFO "%s: host device not found\n", __func__);
696 r = -EINVAL;
697 goto out_free;
698 }
699
700 /* Don't allow bridges to be assigned */
701 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
702 r = -EPERM;
703 goto out_put;
704 }
705
706 r = probe_sysfs_permissions(dev);
707 if (r)
708 goto out_put;
709
710 if (pci_enable_device(dev)) {
711 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
712 r = -EBUSY;
713 goto out_put;
714 }
715 r = pci_request_regions(dev, "kvm_assigned_device");
716 if (r) {
717 printk(KERN_INFO "%s: Could not get access to device regions\n",
718 __func__);
719 goto out_disable;
720 }
721
722 pci_reset_function(dev);
723 pci_save_state(dev);
724 match->pci_saved_state = pci_store_saved_state(dev);
725 if (!match->pci_saved_state)
726 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
727 __func__, dev_name(&dev->dev));
728
729 if (!pci_intx_mask_supported(dev))
730 assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
731
732 match->assigned_dev_id = assigned_dev->assigned_dev_id;
733 match->host_segnr = assigned_dev->segnr;
734 match->host_busnr = assigned_dev->busnr;
735 match->host_devfn = assigned_dev->devfn;
736 match->flags = assigned_dev->flags;
737 match->dev = dev;
738 spin_lock_init(&match->intx_lock);
739 spin_lock_init(&match->intx_mask_lock);
740 match->irq_source_id = -1;
741 match->kvm = kvm;
742 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
743
744 list_add(&match->list, &kvm->arch.assigned_dev_head);
745
746 if (!kvm->arch.iommu_domain) {
747 r = kvm_iommu_map_guest(kvm);
748 if (r)
749 goto out_list_del;
750 }
751 r = kvm_assign_device(kvm, match);
752 if (r)
753 goto out_list_del;
754
755out:
756 srcu_read_unlock(&kvm->srcu, idx);
757 mutex_unlock(&kvm->lock);
758 return r;
759out_list_del:
760 if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
761 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
762 __func__, dev_name(&dev->dev));
763 list_del(&match->list);
764 pci_release_regions(dev);
765out_disable:
766 pci_disable_device(dev);
767out_put:
768 pci_dev_put(dev);
769out_free:
770 kfree(match);
771 srcu_read_unlock(&kvm->srcu, idx);
772 mutex_unlock(&kvm->lock);
773 return r;
774}
775
776static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
777 struct kvm_assigned_pci_dev *assigned_dev)
778{
779 int r = 0;
780 struct kvm_assigned_dev_kernel *match;
781
782 mutex_lock(&kvm->lock);
783
784 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
785 assigned_dev->assigned_dev_id);
786 if (!match) {
787 printk(KERN_INFO "%s: device hasn't been assigned before, "
788 "so cannot be deassigned\n", __func__);
789 r = -EINVAL;
790 goto out;
791 }
792
793 kvm_deassign_device(kvm, match);
794
795 kvm_free_assigned_device(kvm, match);
796
797out:
798 mutex_unlock(&kvm->lock);
799 return r;
800}
801
802
803#ifdef __KVM_HAVE_MSIX
804static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
805 struct kvm_assigned_msix_nr *entry_nr)
806{
807 int r = 0;
808 struct kvm_assigned_dev_kernel *adev;
809
810 mutex_lock(&kvm->lock);
811
812 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
813 entry_nr->assigned_dev_id);
814 if (!adev) {
815 r = -EINVAL;
816 goto msix_nr_out;
817 }
818
819 if (adev->entries_nr == 0) {
820 adev->entries_nr = entry_nr->entry_nr;
821 if (adev->entries_nr == 0 ||
822 adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
823 r = -EINVAL;
824 goto msix_nr_out;
825 }
826
827 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
828 entry_nr->entry_nr,
829 GFP_KERNEL);
830 if (!adev->host_msix_entries) {
831 r = -ENOMEM;
832 goto msix_nr_out;
833 }
834 adev->guest_msix_entries =
835 kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
836 GFP_KERNEL);
837 if (!adev->guest_msix_entries) {
838 kfree(adev->host_msix_entries);
839 r = -ENOMEM;
840 goto msix_nr_out;
841 }
842 } else /* Not allowed set MSI-X number twice */
843 r = -EINVAL;
844msix_nr_out:
845 mutex_unlock(&kvm->lock);
846 return r;
847}
848
849static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
850 struct kvm_assigned_msix_entry *entry)
851{
852 int r = 0, i;
853 struct kvm_assigned_dev_kernel *adev;
854
855 mutex_lock(&kvm->lock);
856
857 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
858 entry->assigned_dev_id);
859
860 if (!adev) {
861 r = -EINVAL;
862 goto msix_entry_out;
863 }
864
865 for (i = 0; i < adev->entries_nr; i++)
866 if (adev->guest_msix_entries[i].vector == 0 ||
867 adev->guest_msix_entries[i].entry == entry->entry) {
868 adev->guest_msix_entries[i].entry = entry->entry;
869 adev->guest_msix_entries[i].vector = entry->gsi;
870 adev->host_msix_entries[i].entry = entry->entry;
871 break;
872 }
873 if (i == adev->entries_nr) {
874 r = -ENOSPC;
875 goto msix_entry_out;
876 }
877
878msix_entry_out:
879 mutex_unlock(&kvm->lock);
880
881 return r;
882}
883#endif
884
885static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
886 struct kvm_assigned_pci_dev *assigned_dev)
887{
888 int r = 0;
889 struct kvm_assigned_dev_kernel *match;
890
891 mutex_lock(&kvm->lock);
892
893 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
894 assigned_dev->assigned_dev_id);
895 if (!match) {
896 r = -ENODEV;
897 goto out;
898 }
899
900 spin_lock(&match->intx_mask_lock);
901
902 match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
903 match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
904
905 if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
906 if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
907 kvm_set_irq(match->kvm, match->irq_source_id,
908 match->guest_irq, 0, false);
909 /*
910 * Masking at hardware-level is performed on demand,
911 * i.e. when an IRQ actually arrives at the host.
912 */
913 } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
914 /*
915 * Unmask the IRQ line if required. Unmasking at
916 * device level will be performed by user space.
917 */
918 spin_lock_irq(&match->intx_lock);
919 if (match->host_irq_disabled) {
920 enable_irq(match->host_irq);
921 match->host_irq_disabled = false;
922 }
923 spin_unlock_irq(&match->intx_lock);
924 }
925 }
926
927 spin_unlock(&match->intx_mask_lock);
928
929out:
930 mutex_unlock(&kvm->lock);
931 return r;
932}
933
934long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
935 unsigned long arg)
936{
937 void __user *argp = (void __user *)arg;
938 int r;
939
940 switch (ioctl) {
941 case KVM_ASSIGN_PCI_DEVICE: {
942 struct kvm_assigned_pci_dev assigned_dev;
943
944 r = -EFAULT;
945 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
946 goto out;
947 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
948 if (r)
949 goto out;
950 break;
951 }
952 case KVM_ASSIGN_IRQ: {
953 r = -EOPNOTSUPP;
954 break;
955 }
956 case KVM_ASSIGN_DEV_IRQ: {
957 struct kvm_assigned_irq assigned_irq;
958
959 r = -EFAULT;
960 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
961 goto out;
962 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
963 if (r)
964 goto out;
965 break;
966 }
967 case KVM_DEASSIGN_DEV_IRQ: {
968 struct kvm_assigned_irq assigned_irq;
969
970 r = -EFAULT;
971 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
972 goto out;
973 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
974 if (r)
975 goto out;
976 break;
977 }
978 case KVM_DEASSIGN_PCI_DEVICE: {
979 struct kvm_assigned_pci_dev assigned_dev;
980
981 r = -EFAULT;
982 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
983 goto out;
984 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
985 if (r)
986 goto out;
987 break;
988 }
989#ifdef __KVM_HAVE_MSIX
990 case KVM_ASSIGN_SET_MSIX_NR: {
991 struct kvm_assigned_msix_nr entry_nr;
992 r = -EFAULT;
993 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
994 goto out;
995 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
996 if (r)
997 goto out;
998 break;
999 }
1000 case KVM_ASSIGN_SET_MSIX_ENTRY: {
1001 struct kvm_assigned_msix_entry entry;
1002 r = -EFAULT;
1003 if (copy_from_user(&entry, argp, sizeof entry))
1004 goto out;
1005 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
1006 if (r)
1007 goto out;
1008 break;
1009 }
1010#endif
1011 case KVM_ASSIGN_SET_INTX_MASK: {
1012 struct kvm_assigned_pci_dev assigned_dev;
1013
1014 r = -EFAULT;
1015 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1016 goto out;
1017 r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
1018 break;
1019 }
1020 default:
1021 r = -ENOTTY;
1022 break;
1023 }
1024out:
1025 return r;
1026}
diff --git a/virt/kvm/iommu.c b/virt/kvm/iommu.c
deleted file mode 100644
index c1e6ae989a43..000000000000
--- a/virt/kvm/iommu.c
+++ /dev/null
@@ -1,358 +0,0 @@
1/*
2 * Copyright (c) 2006, Intel Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Copyright (C) 2006-2008 Intel Corporation
18 * Copyright IBM Corporation, 2008
19 * Copyright 2010 Red Hat, Inc. and/or its affiliates.
20 *
21 * Author: Allen M. Kay <allen.m.kay@intel.com>
22 * Author: Weidong Han <weidong.han@intel.com>
23 * Author: Ben-Ami Yassour <benami@il.ibm.com>
24 */
25
26#include <linux/list.h>
27#include <linux/kvm_host.h>
28#include <linux/module.h>
29#include <linux/pci.h>
30#include <linux/stat.h>
31#include <linux/dmar.h>
32#include <linux/iommu.h>
33#include <linux/intel-iommu.h>
34
35static bool allow_unsafe_assigned_interrupts;
36module_param_named(allow_unsafe_assigned_interrupts,
37 allow_unsafe_assigned_interrupts, bool, S_IRUGO | S_IWUSR);
38MODULE_PARM_DESC(allow_unsafe_assigned_interrupts,
39 "Enable device assignment on platforms without interrupt remapping support.");
40
41static int kvm_iommu_unmap_memslots(struct kvm *kvm);
42static void kvm_iommu_put_pages(struct kvm *kvm,
43 gfn_t base_gfn, unsigned long npages);
44
45static pfn_t kvm_pin_pages(struct kvm_memory_slot *slot, gfn_t gfn,
46 unsigned long npages)
47{
48 gfn_t end_gfn;
49 pfn_t pfn;
50
51 pfn = gfn_to_pfn_memslot(slot, gfn);
52 end_gfn = gfn + npages;
53 gfn += 1;
54
55 if (is_error_noslot_pfn(pfn))
56 return pfn;
57
58 while (gfn < end_gfn)
59 gfn_to_pfn_memslot(slot, gfn++);
60
61 return pfn;
62}
63
64static void kvm_unpin_pages(struct kvm *kvm, pfn_t pfn, unsigned long npages)
65{
66 unsigned long i;
67
68 for (i = 0; i < npages; ++i)
69 kvm_release_pfn_clean(pfn + i);
70}
71
72int kvm_iommu_map_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
73{
74 gfn_t gfn, end_gfn;
75 pfn_t pfn;
76 int r = 0;
77 struct iommu_domain *domain = kvm->arch.iommu_domain;
78 int flags;
79
80 /* check if iommu exists and in use */
81 if (!domain)
82 return 0;
83
84 gfn = slot->base_gfn;
85 end_gfn = gfn + slot->npages;
86
87 flags = IOMMU_READ;
88 if (!(slot->flags & KVM_MEM_READONLY))
89 flags |= IOMMU_WRITE;
90 if (!kvm->arch.iommu_noncoherent)
91 flags |= IOMMU_CACHE;
92
93
94 while (gfn < end_gfn) {
95 unsigned long page_size;
96
97 /* Check if already mapped */
98 if (iommu_iova_to_phys(domain, gfn_to_gpa(gfn))) {
99 gfn += 1;
100 continue;
101 }
102
103 /* Get the page size we could use to map */
104 page_size = kvm_host_page_size(kvm, gfn);
105
106 /* Make sure the page_size does not exceed the memslot */
107 while ((gfn + (page_size >> PAGE_SHIFT)) > end_gfn)
108 page_size >>= 1;
109
110 /* Make sure gfn is aligned to the page size we want to map */
111 while ((gfn << PAGE_SHIFT) & (page_size - 1))
112 page_size >>= 1;
113
114 /* Make sure hva is aligned to the page size we want to map */
115 while (__gfn_to_hva_memslot(slot, gfn) & (page_size - 1))
116 page_size >>= 1;
117
118 /*
119 * Pin all pages we are about to map in memory. This is
120 * important because we unmap and unpin in 4kb steps later.
121 */
122 pfn = kvm_pin_pages(slot, gfn, page_size >> PAGE_SHIFT);
123 if (is_error_noslot_pfn(pfn)) {
124 gfn += 1;
125 continue;
126 }
127
128 /* Map into IO address space */
129 r = iommu_map(domain, gfn_to_gpa(gfn), pfn_to_hpa(pfn),
130 page_size, flags);
131 if (r) {
132 printk(KERN_ERR "kvm_iommu_map_address:"
133 "iommu failed to map pfn=%llx\n", pfn);
134 kvm_unpin_pages(kvm, pfn, page_size >> PAGE_SHIFT);
135 goto unmap_pages;
136 }
137
138 gfn += page_size >> PAGE_SHIFT;
139
140
141 }
142
143 return 0;
144
145unmap_pages:
146 kvm_iommu_put_pages(kvm, slot->base_gfn, gfn - slot->base_gfn);
147 return r;
148}
149
150static int kvm_iommu_map_memslots(struct kvm *kvm)
151{
152 int idx, r = 0;
153 struct kvm_memslots *slots;
154 struct kvm_memory_slot *memslot;
155
156 if (kvm->arch.iommu_noncoherent)
157 kvm_arch_register_noncoherent_dma(kvm);
158
159 idx = srcu_read_lock(&kvm->srcu);
160 slots = kvm_memslots(kvm);
161
162 kvm_for_each_memslot(memslot, slots) {
163 r = kvm_iommu_map_pages(kvm, memslot);
164 if (r)
165 break;
166 }
167 srcu_read_unlock(&kvm->srcu, idx);
168
169 return r;
170}
171
172int kvm_assign_device(struct kvm *kvm,
173 struct kvm_assigned_dev_kernel *assigned_dev)
174{
175 struct pci_dev *pdev = NULL;
176 struct iommu_domain *domain = kvm->arch.iommu_domain;
177 int r;
178 bool noncoherent;
179
180 /* check if iommu exists and in use */
181 if (!domain)
182 return 0;
183
184 pdev = assigned_dev->dev;
185 if (pdev == NULL)
186 return -ENODEV;
187
188 r = iommu_attach_device(domain, &pdev->dev);
189 if (r) {
190 dev_err(&pdev->dev, "kvm assign device failed ret %d", r);
191 return r;
192 }
193
194 noncoherent = !iommu_capable(&pci_bus_type, IOMMU_CAP_CACHE_COHERENCY);
195
196 /* Check if need to update IOMMU page table for guest memory */
197 if (noncoherent != kvm->arch.iommu_noncoherent) {
198 kvm_iommu_unmap_memslots(kvm);
199 kvm->arch.iommu_noncoherent = noncoherent;
200 r = kvm_iommu_map_memslots(kvm);
201 if (r)
202 goto out_unmap;
203 }
204
205 pci_set_dev_assigned(pdev);
206
207 dev_info(&pdev->dev, "kvm assign device\n");
208
209 return 0;
210out_unmap:
211 kvm_iommu_unmap_memslots(kvm);
212 return r;
213}
214
215int kvm_deassign_device(struct kvm *kvm,
216 struct kvm_assigned_dev_kernel *assigned_dev)
217{
218 struct iommu_domain *domain = kvm->arch.iommu_domain;
219 struct pci_dev *pdev = NULL;
220
221 /* check if iommu exists and in use */
222 if (!domain)
223 return 0;
224
225 pdev = assigned_dev->dev;
226 if (pdev == NULL)
227 return -ENODEV;
228
229 iommu_detach_device(domain, &pdev->dev);
230
231 pci_clear_dev_assigned(pdev);
232
233 dev_info(&pdev->dev, "kvm deassign device\n");
234
235 return 0;
236}
237
238int kvm_iommu_map_guest(struct kvm *kvm)
239{
240 int r;
241
242 if (!iommu_present(&pci_bus_type)) {
243 printk(KERN_ERR "%s: iommu not found\n", __func__);
244 return -ENODEV;
245 }
246
247 mutex_lock(&kvm->slots_lock);
248
249 kvm->arch.iommu_domain = iommu_domain_alloc(&pci_bus_type);
250 if (!kvm->arch.iommu_domain) {
251 r = -ENOMEM;
252 goto out_unlock;
253 }
254
255 if (!allow_unsafe_assigned_interrupts &&
256 !iommu_capable(&pci_bus_type, IOMMU_CAP_INTR_REMAP)) {
257 printk(KERN_WARNING "%s: No interrupt remapping support,"
258 " disallowing device assignment."
259 " Re-enble with \"allow_unsafe_assigned_interrupts=1\""
260 " module option.\n", __func__);
261 iommu_domain_free(kvm->arch.iommu_domain);
262 kvm->arch.iommu_domain = NULL;
263 r = -EPERM;
264 goto out_unlock;
265 }
266
267 r = kvm_iommu_map_memslots(kvm);
268 if (r)
269 kvm_iommu_unmap_memslots(kvm);
270
271out_unlock:
272 mutex_unlock(&kvm->slots_lock);
273 return r;
274}
275
276static void kvm_iommu_put_pages(struct kvm *kvm,
277 gfn_t base_gfn, unsigned long npages)
278{
279 struct iommu_domain *domain;
280 gfn_t end_gfn, gfn;
281 pfn_t pfn;
282 u64 phys;
283
284 domain = kvm->arch.iommu_domain;
285 end_gfn = base_gfn + npages;
286 gfn = base_gfn;
287
288 /* check if iommu exists and in use */
289 if (!domain)
290 return;
291
292 while (gfn < end_gfn) {
293 unsigned long unmap_pages;
294 size_t size;
295
296 /* Get physical address */
297 phys = iommu_iova_to_phys(domain, gfn_to_gpa(gfn));
298
299 if (!phys) {
300 gfn++;
301 continue;
302 }
303
304 pfn = phys >> PAGE_SHIFT;
305
306 /* Unmap address from IO address space */
307 size = iommu_unmap(domain, gfn_to_gpa(gfn), PAGE_SIZE);
308 unmap_pages = 1ULL << get_order(size);
309
310 /* Unpin all pages we just unmapped to not leak any memory */
311 kvm_unpin_pages(kvm, pfn, unmap_pages);
312
313 gfn += unmap_pages;
314 }
315}
316
317void kvm_iommu_unmap_pages(struct kvm *kvm, struct kvm_memory_slot *slot)
318{
319 kvm_iommu_put_pages(kvm, slot->base_gfn, slot->npages);
320}
321
322static int kvm_iommu_unmap_memslots(struct kvm *kvm)
323{
324 int idx;
325 struct kvm_memslots *slots;
326 struct kvm_memory_slot *memslot;
327
328 idx = srcu_read_lock(&kvm->srcu);
329 slots = kvm_memslots(kvm);
330
331 kvm_for_each_memslot(memslot, slots)
332 kvm_iommu_unmap_pages(kvm, memslot);
333
334 srcu_read_unlock(&kvm->srcu, idx);
335
336 if (kvm->arch.iommu_noncoherent)
337 kvm_arch_unregister_noncoherent_dma(kvm);
338
339 return 0;
340}
341
342int kvm_iommu_unmap_guest(struct kvm *kvm)
343{
344 struct iommu_domain *domain = kvm->arch.iommu_domain;
345
346 /* check if iommu exists and in use */
347 if (!domain)
348 return 0;
349
350 mutex_lock(&kvm->slots_lock);
351 kvm_iommu_unmap_memslots(kvm);
352 kvm->arch.iommu_domain = NULL;
353 kvm->arch.iommu_noncoherent = false;
354 mutex_unlock(&kvm->slots_lock);
355
356 iommu_domain_free(domain);
357 return 0;
358}
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 3be43424818b..5b4533079eaa 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2582,8 +2582,6 @@ static long kvm_vm_ioctl(struct file *filp,
2582 break; 2582 break;
2583 default: 2583 default:
2584 r = kvm_arch_vm_ioctl(filp, ioctl, arg); 2584 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
2585 if (r == -ENOTTY)
2586 r = kvm_vm_ioctl_assigned_device(kvm, ioctl, arg);
2587 } 2585 }
2588out: 2586out:
2589 return r; 2587 return r;
generated by cgit v1.2.2 (git 2.25.0) at 2026-05-11 10:39:15 -0400