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Revert "KVM: x86: Increase the number of fixed MTRR regs to 10"
[deliverable/linux.git] / virt / kvm / assigned-dev.c
CommitLineData
bfd99ff5
AK		 1/*
2 * Kernel-based Virtual Machine - device assignment support
3 *
221d059d 4 * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
bfd99ff5
AK		 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>
5a0e3ad6 19#include <linux/slab.h>
3d27e23b
AW		 20#include <linux/namei.h>
21#include <linux/fs.h>
bfd99ff5
AK		 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 }
b93a3553 52 if (index < 0)
bfd99ff5 53 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
bfd99ff5
AK		 54
55 return index;
56}
57
07700a94 58static irqreturn_t kvm_assigned_dev_intx(int irq, void *dev_id)
bfd99ff5 59{
0645211c 60 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
07700a94 61 int ret;
bfd99ff5 62
07700a94
JK		 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)) {
cf9eeac4 80 spin_lock(&assigned_dev->intx_mask_lock);
07700a94
JK		 81 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
82 kvm_set_irq(assigned_dev->kvm,
aa2fbe6d
YZ		 83 assigned_dev->irq_source_id, vector, 1,
84 false);
cf9eeac4 85 spin_unlock(&assigned_dev->intx_mask_lock);
07700a94
JK		 86 } else
87 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
aa2fbe6d 88 vector, 1, false);
07700a94
JK		 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);
0645211c
JK		 97 disable_irq_nosync(irq);
98 assigned_dev->host_irq_disabled = true;
07700a94 99 spin_unlock_irq(&assigned_dev->intx_lock);
0645211c 100 }
bfd99ff5 101
07700a94
JK		 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
78c63440
MT		 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
07700a94
JK		 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);
cc079396
JK		 124
125 return IRQ_HANDLED;
126}
07700a94 127#endif
cc079396
JK		 128
129#ifdef __KVM_HAVE_MSIX
78c63440
MT		 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
cc079396
JK		 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;
07700a94 155 kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
cc079396 156 }
bfd99ff5 157
bfd99ff5
AK		 158 return IRQ_HANDLED;
159}
cc079396 160#endif
bfd99ff5
AK		 161
162/* Ack the irq line for an assigned device */
163static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
164{
c61fa9d6
JK		 165 struct kvm_assigned_dev_kernel *dev =
166 container_of(kian, struct kvm_assigned_dev_kernel,
167 ack_notifier);
bfd99ff5 168
aa2fbe6d 169 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false);
bfd99ff5 170
cf9eeac4 171 spin_lock(&dev->intx_mask_lock);
07700a94
JK		 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,
aa2fbe6d 192 dev->guest_irq, 1, false);
bfd99ff5 193 }
07700a94 194
cf9eeac4 195 spin_unlock(&dev->intx_mask_lock);
bfd99ff5
AK		 196}
197
198static void deassign_guest_irq(struct kvm *kvm,
199 struct kvm_assigned_dev_kernel *assigned_dev)
200{
c61fa9d6
JK		 201 if (assigned_dev->ack_notifier.gsi != -1)
202 kvm_unregister_irq_ack_notifier(kvm,
203 &assigned_dev->ack_notifier);
bfd99ff5 204
0c106b5a 205 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
aa2fbe6d 206 assigned_dev->guest_irq, 0, false);
0c106b5a 207
bfd99ff5
AK		 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 /*
0645211c 219 * We disable irq here to prevent further events.
bfd99ff5
AK		 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
0645211c 226 * on a currently running IRQ handler.
bfd99ff5
AK		 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++)
0645211c 231 disable_irq(assigned_dev->host_msix_entries[i].vector);
bfd99ff5
AK		 232
233 for (i = 0; i < assigned_dev->entries_nr; i++)
234 free_irq(assigned_dev->host_msix_entries[i].vector,
9f9f6b78 235 assigned_dev);
bfd99ff5
AK		 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 */
07700a94
JK		 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);
bfd99ff5 252
9f9f6b78 253 free_irq(assigned_dev->host_irq, assigned_dev);
bfd99ff5
AK		 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
f8fcfd77
AW		 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);
bfd99ff5 304
6777829c
GR		 305 assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
306
bfd99ff5
AK		 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{
07700a94
JK		 332 irq_handler_t irq_handler;
333 unsigned long flags;
334
bfd99ff5 335 dev->host_irq = dev->dev->irq;
07700a94
JK		 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.
bfd99ff5 342 */
07700a94
JK		 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))
bfd99ff5 353 return -EIO;
07700a94
JK		 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 }
bfd99ff5
AK		 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;
a76beb14 376 if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,
07700a94
JK		 377 kvm_assigned_dev_thread_msi, 0,
378 dev->irq_name, dev)) {
bfd99ff5
AK		 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
e8e249d7
AG		 398 r = pci_enable_msix_exact(dev->dev,
399 dev->host_msix_entries, dev->entries_nr);
bfd99ff5
AK		 400 if (r)
401 return r;
402
403 for (i = 0; i < dev->entries_nr; i++) {
0645211c 404 r = request_threaded_irq(dev->host_msix_entries[i].vector,
a76beb14
AW		 405 kvm_assigned_dev_msix,
406 kvm_assigned_dev_thread_msix,
9f9f6b78 407 0, dev->irq_name, dev);
bfd99ff5 408 if (r)
d57e2c07 409 goto err;
bfd99ff5
AK		 410 }
411
412 return 0;
d57e2c07 413err:
414 for (i -= 1; i >= 0; i--)
9f9f6b78 415 free_irq(dev->host_msix_entries[i].vector, dev);
d57e2c07 416 pci_disable_msix(dev->dev);
417 return r;
bfd99ff5
AK		 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;
bfd99ff5
AK		 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;
bfd99ff5
AK		 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
1e001d49
JK		 462 snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
463 pci_name(dev->dev));
464
bfd99ff5
AK		 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 }
07700a94 482 dev->host_irq_disabled = false;
bfd99ff5
AK		 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;
c61fa9d6
JK		 527 if (dev->ack_notifier.gsi != -1)
528 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
bfd99ff5
AK		 529 } else
530 kvm_free_irq_source_id(kvm, dev->irq_source_id);
531
532 return r;
533}
534
535/* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */
536static int kvm_vm_ioctl_assign_irq(struct kvm *kvm,
537 struct kvm_assigned_irq *assigned_irq)
538{
539 int r = -EINVAL;
540 struct kvm_assigned_dev_kernel *match;
541 unsigned long host_irq_type, guest_irq_type;
542
bfd99ff5
AK		 543 if (!irqchip_in_kernel(kvm))
544 return r;
545
546 mutex_lock(&kvm->lock);
547 r = -ENODEV;
548 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
549 assigned_irq->assigned_dev_id);
550 if (!match)
551 goto out;
552
553 host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK);
554 guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK);
555
556 r = -EINVAL;
557 /* can only assign one type at a time */
558 if (hweight_long(host_irq_type) > 1)
559 goto out;
560 if (hweight_long(guest_irq_type) > 1)
561 goto out;
562 if (host_irq_type == 0 && guest_irq_type == 0)
563 goto out;
564
565 r = 0;
566 if (host_irq_type)
567 r = assign_host_irq(kvm, match, host_irq_type);
568 if (r)
569 goto out;
570
571 if (guest_irq_type)
572 r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type);
573out:
574 mutex_unlock(&kvm->lock);
575 return r;
576}
577
578static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm,
579 struct kvm_assigned_irq
580 *assigned_irq)
581{
582 int r = -ENODEV;
583 struct kvm_assigned_dev_kernel *match;
07700a94 584 unsigned long irq_type;
bfd99ff5
AK		 585
586 mutex_lock(&kvm->lock);
587
588 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
589 assigned_irq->assigned_dev_id);
590 if (!match)
591 goto out;
592
07700a94
JK		 593 irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK |
594 KVM_DEV_IRQ_GUEST_MASK);
595 r = kvm_deassign_irq(kvm, match, irq_type);
bfd99ff5
AK		 596out:
597 mutex_unlock(&kvm->lock);
598 return r;
599}
600
3d27e23b
AW		 601/*
602 * We want to test whether the caller has been granted permissions to
603 * use this device. To be able to configure and control the device,
604 * the user needs access to PCI configuration space and BAR resources.
605 * These are accessed through PCI sysfs. PCI config space is often
606 * passed to the process calling this ioctl via file descriptor, so we
607 * can't rely on access to that file. We can check for permissions
608 * on each of the BAR resource files, which is a pretty clear
609 * indicator that the user has been granted access to the device.
610 */
611static int probe_sysfs_permissions(struct pci_dev *dev)
612{
613#ifdef CONFIG_SYSFS
614 int i;
615 bool bar_found = false;
616
617 for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) {
618 char *kpath, *syspath;
619 struct path path;
620 struct inode *inode;
621 int r;
622
623 if (!pci_resource_len(dev, i))
624 continue;
625
626 kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL);
627 if (!kpath)
628 return -ENOMEM;
629
630 /* Per sysfs-rules, sysfs is always at /sys */
631 syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i);
632 kfree(kpath);
633 if (!syspath)
634 return -ENOMEM;
635
636 r = kern_path(syspath, LOOKUP_FOLLOW, &path);
637 kfree(syspath);
638 if (r)
639 return r;
640
641 inode = path.dentry->d_inode;
642
643 r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS);
644 path_put(&path);
645 if (r)
646 return r;
647
648 bar_found = true;
649 }
650
651 /* If no resources, probably something special */
652 if (!bar_found)
653 return -EPERM;
654
655 return 0;
656#else
657 return -EINVAL; /* No way to control the device without sysfs */
658#endif
659}
660
bfd99ff5
AK		 661static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
662 struct kvm_assigned_pci_dev *assigned_dev)
663{
bc6678a3 664 int r = 0, idx;
bfd99ff5
AK		 665 struct kvm_assigned_dev_kernel *match;
666 struct pci_dev *dev;
667
42387373
AW		 668 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
669 return -EINVAL;
670
bfd99ff5 671 mutex_lock(&kvm->lock);
bc6678a3 672 idx = srcu_read_lock(&kvm->srcu);
bfd99ff5
AK		 673
674 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
675 assigned_dev->assigned_dev_id);
676 if (match) {
677 /* device already assigned */
678 r = -EEXIST;
679 goto out;
680 }
681
682 match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL);
683 if (match == NULL) {
684 printk(KERN_INFO "%s: Couldn't allocate memory\n",
685 __func__);
686 r = -ENOMEM;
687 goto out;
688 }
ab9f4ecb
ZE		 689 dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
690 assigned_dev->busnr,
bfd99ff5
AK		 691 assigned_dev->devfn);
692 if (!dev) {
693 printk(KERN_INFO "%s: host device not found\n", __func__);
694 r = -EINVAL;
695 goto out_free;
696 }
3d27e23b
AW		 697
698 /* Don't allow bridges to be assigned */
f961f728 699 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
3d27e23b
AW		 700 r = -EPERM;
701 goto out_put;
702 }
703
704 r = probe_sysfs_permissions(dev);
705 if (r)
706 goto out_put;
707
bfd99ff5
AK		 708 if (pci_enable_device(dev)) {
709 printk(KERN_INFO "%s: Could not enable PCI device\n", __func__);
710 r = -EBUSY;
711 goto out_put;
712 }
713 r = pci_request_regions(dev, "kvm_assigned_device");
714 if (r) {
715 printk(KERN_INFO "%s: Could not get access to device regions\n",
716 __func__);
717 goto out_disable;
718 }
719
720 pci_reset_function(dev);
ed78661f 721 pci_save_state(dev);
f8fcfd77
AW		 722 match->pci_saved_state = pci_store_saved_state(dev);
723 if (!match->pci_saved_state)
724 printk(KERN_DEBUG "%s: Couldn't store %s saved state\n",
725 __func__, dev_name(&dev->dev));
07700a94
JK		 726
727 if (!pci_intx_mask_supported(dev))
728 assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
729
bfd99ff5 730 match->assigned_dev_id = assigned_dev->assigned_dev_id;
ab9f4ecb 731 match->host_segnr = assigned_dev->segnr;
bfd99ff5
AK		 732 match->host_busnr = assigned_dev->busnr;
733 match->host_devfn = assigned_dev->devfn;
734 match->flags = assigned_dev->flags;
735 match->dev = dev;
0645211c 736 spin_lock_init(&match->intx_lock);
cf9eeac4 737 spin_lock_init(&match->intx_mask_lock);
bfd99ff5
AK		 738 match->irq_source_id = -1;
739 match->kvm = kvm;
740 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
bfd99ff5
AK		 741
742 list_add(&match->list, &kvm->arch.assigned_dev_head);
743
42387373
AW		 744 if (!kvm->arch.iommu_domain) {
745 r = kvm_iommu_map_guest(kvm);
bfd99ff5
AK		 746 if (r)
747 goto out_list_del;
748 }
42387373
AW		 749 r = kvm_assign_device(kvm, match);
750 if (r)
751 goto out_list_del;
bfd99ff5
AK		 752
753out:
bc6678a3 754 srcu_read_unlock(&kvm->srcu, idx);
fae3a353 755 mutex_unlock(&kvm->lock);
bfd99ff5
AK		 756 return r;
757out_list_del:
f8fcfd77
AW		 758 if (pci_load_and_free_saved_state(dev, &match->pci_saved_state))
759 printk(KERN_INFO "%s: Couldn't reload %s saved state\n",
760 __func__, dev_name(&dev->dev));
bfd99ff5
AK		 761 list_del(&match->list);
762 pci_release_regions(dev);
763out_disable:
764 pci_disable_device(dev);
765out_put:
766 pci_dev_put(dev);
767out_free:
768 kfree(match);
bc6678a3 769 srcu_read_unlock(&kvm->srcu, idx);
fae3a353 770 mutex_unlock(&kvm->lock);
bfd99ff5
AK		 771 return r;
772}
773
774static int kvm_vm_ioctl_deassign_device(struct kvm *kvm,
775 struct kvm_assigned_pci_dev *assigned_dev)
776{
777 int r = 0;
778 struct kvm_assigned_dev_kernel *match;
779
780 mutex_lock(&kvm->lock);
781
782 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
783 assigned_dev->assigned_dev_id);
784 if (!match) {
785 printk(KERN_INFO "%s: device hasn't been assigned before, "
786 "so cannot be deassigned\n", __func__);
787 r = -EINVAL;
788 goto out;
789 }
790
42387373 791 kvm_deassign_device(kvm, match);
bfd99ff5
AK		 792
793 kvm_free_assigned_device(kvm, match);
794
795out:
796 mutex_unlock(&kvm->lock);
797 return r;
798}
799
800
801#ifdef __KVM_HAVE_MSIX
802static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
803 struct kvm_assigned_msix_nr *entry_nr)
804{
805 int r = 0;
806 struct kvm_assigned_dev_kernel *adev;
807
808 mutex_lock(&kvm->lock);
809
810 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
811 entry_nr->assigned_dev_id);
812 if (!adev) {
813 r = -EINVAL;
814 goto msix_nr_out;
815 }
816
817 if (adev->entries_nr == 0) {
818 adev->entries_nr = entry_nr->entry_nr;
819 if (adev->entries_nr == 0 ||
9f3191ae 820 adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
bfd99ff5
AK		 821 r = -EINVAL;
822 goto msix_nr_out;
823 }
824
825 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
826 entry_nr->entry_nr,
827 GFP_KERNEL);
828 if (!adev->host_msix_entries) {
829 r = -ENOMEM;
830 goto msix_nr_out;
831 }
0645211c
JK		 832 adev->guest_msix_entries =
833 kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
834 GFP_KERNEL);
bfd99ff5
AK		 835 if (!adev->guest_msix_entries) {
836 kfree(adev->host_msix_entries);
837 r = -ENOMEM;
838 goto msix_nr_out;
839 }
840 } else /* Not allowed set MSI-X number twice */
841 r = -EINVAL;
842msix_nr_out:
843 mutex_unlock(&kvm->lock);
844 return r;
845}
846
847static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
848 struct kvm_assigned_msix_entry *entry)
849{
850 int r = 0, i;
851 struct kvm_assigned_dev_kernel *adev;
852
853 mutex_lock(&kvm->lock);
854
855 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
856 entry->assigned_dev_id);
857
858 if (!adev) {
859 r = -EINVAL;
860 goto msix_entry_out;
861 }
862
863 for (i = 0; i < adev->entries_nr; i++)
864 if (adev->guest_msix_entries[i].vector == 0 ||
865 adev->guest_msix_entries[i].entry == entry->entry) {
866 adev->guest_msix_entries[i].entry = entry->entry;
867 adev->guest_msix_entries[i].vector = entry->gsi;
868 adev->host_msix_entries[i].entry = entry->entry;
869 break;
870 }
871 if (i == adev->entries_nr) {
872 r = -ENOSPC;
873 goto msix_entry_out;
874 }
875
876msix_entry_out:
877 mutex_unlock(&kvm->lock);
878
879 return r;
880}
881#endif
882
07700a94
JK		 883static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm,
884 struct kvm_assigned_pci_dev *assigned_dev)
885{
886 int r = 0;
887 struct kvm_assigned_dev_kernel *match;
888
889 mutex_lock(&kvm->lock);
890
891 match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
892 assigned_dev->assigned_dev_id);
893 if (!match) {
894 r = -ENODEV;
895 goto out;
896 }
897
cf9eeac4 898 spin_lock(&match->intx_mask_lock);
07700a94
JK		 899
900 match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX;
901 match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX;
902
903 if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) {
904 if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) {
905 kvm_set_irq(match->kvm, match->irq_source_id,
aa2fbe6d 906 match->guest_irq, 0, false);
07700a94
JK		 907 /*
908 * Masking at hardware-level is performed on demand,
909 * i.e. when an IRQ actually arrives at the host.
910 */
911 } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
912 /*
913 * Unmask the IRQ line if required. Unmasking at
914 * device level will be performed by user space.
915 */
916 spin_lock_irq(&match->intx_lock);
917 if (match->host_irq_disabled) {
918 enable_irq(match->host_irq);
919 match->host_irq_disabled = false;
920 }
921 spin_unlock_irq(&match->intx_lock);
922 }
923 }
924
cf9eeac4 925 spin_unlock(&match->intx_mask_lock);
07700a94
JK		 926
927out:
928 mutex_unlock(&kvm->lock);
929 return r;
930}
931
bfd99ff5
AK		 932long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
933 unsigned long arg)
934{
935 void __user *argp = (void __user *)arg;
51de271d 936 int r;
bfd99ff5
AK		 937
938 switch (ioctl) {
939 case KVM_ASSIGN_PCI_DEVICE: {
940 struct kvm_assigned_pci_dev assigned_dev;
941
942 r = -EFAULT;
943 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
944 goto out;
945 r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev);
946 if (r)
947 goto out;
948 break;
949 }
950 case KVM_ASSIGN_IRQ: {
951 r = -EOPNOTSUPP;
952 break;
953 }
bfd99ff5
AK		 954 case KVM_ASSIGN_DEV_IRQ: {
955 struct kvm_assigned_irq assigned_irq;
956
957 r = -EFAULT;
958 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
959 goto out;
960 r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq);
961 if (r)
962 goto out;
963 break;
964 }
965 case KVM_DEASSIGN_DEV_IRQ: {
966 struct kvm_assigned_irq assigned_irq;
967
968 r = -EFAULT;
969 if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq))
970 goto out;
971 r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq);
972 if (r)
973 goto out;
974 break;
975 }
bfd99ff5
AK		 976 case KVM_DEASSIGN_PCI_DEVICE: {
977 struct kvm_assigned_pci_dev assigned_dev;
978
979 r = -EFAULT;
980 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
981 goto out;
982 r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev);
983 if (r)
984 goto out;
985 break;
986 }
bfd99ff5
AK		 987#ifdef __KVM_HAVE_MSIX
988 case KVM_ASSIGN_SET_MSIX_NR: {
989 struct kvm_assigned_msix_nr entry_nr;
990 r = -EFAULT;
991 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
992 goto out;
993 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
994 if (r)
995 goto out;
996 break;
997 }
998 case KVM_ASSIGN_SET_MSIX_ENTRY: {
999 struct kvm_assigned_msix_entry entry;
1000 r = -EFAULT;
1001 if (copy_from_user(&entry, argp, sizeof entry))
1002 goto out;
1003 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
1004 if (r)
1005 goto out;
1006 break;
1007 }
1008#endif
07700a94
JK		 1009 case KVM_ASSIGN_SET_INTX_MASK: {
1010 struct kvm_assigned_pci_dev assigned_dev;
1011
1012 r = -EFAULT;
1013 if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev))
1014 goto out;
1015 r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev);
1016 break;
1017 }
51de271d
JK		 1018 default:
1019 r = -ENOTTY;
1020 break;
bfd99ff5
AK		 1021 }
1022out:
1023 return r;
1024}
Linux kernel - Deliverables
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