Commit | Line | Data |
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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 | ||
24 | static 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 | ||
38 | static 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 | 58 | static 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 | ||
74 | static void | |
75 | kvm_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, | |
83 | assigned_dev->irq_source_id, vector, 1); | |
cf9eeac4 | 84 | spin_unlock(&assigned_dev->intx_mask_lock); |
07700a94 JK |
85 | } else |
86 | kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, | |
87 | vector, 1); | |
88 | } | |
89 | ||
90 | static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id) | |
91 | { | |
92 | struct kvm_assigned_dev_kernel *assigned_dev = dev_id; | |
93 | ||
94 | if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) { | |
95 | spin_lock_irq(&assigned_dev->intx_lock); | |
0645211c JK |
96 | disable_irq_nosync(irq); |
97 | assigned_dev->host_irq_disabled = true; | |
07700a94 | 98 | spin_unlock_irq(&assigned_dev->intx_lock); |
0645211c | 99 | } |
bfd99ff5 | 100 | |
07700a94 JK |
101 | kvm_assigned_dev_raise_guest_irq(assigned_dev, |
102 | assigned_dev->guest_irq); | |
103 | ||
104 | return IRQ_HANDLED; | |
105 | } | |
106 | ||
107 | #ifdef __KVM_HAVE_MSI | |
108 | static irqreturn_t kvm_assigned_dev_thread_msi(int irq, void *dev_id) | |
109 | { | |
110 | struct kvm_assigned_dev_kernel *assigned_dev = dev_id; | |
111 | ||
112 | kvm_assigned_dev_raise_guest_irq(assigned_dev, | |
113 | assigned_dev->guest_irq); | |
cc079396 JK |
114 | |
115 | return IRQ_HANDLED; | |
116 | } | |
07700a94 | 117 | #endif |
cc079396 JK |
118 | |
119 | #ifdef __KVM_HAVE_MSIX | |
120 | static irqreturn_t kvm_assigned_dev_thread_msix(int irq, void *dev_id) | |
121 | { | |
122 | struct kvm_assigned_dev_kernel *assigned_dev = dev_id; | |
123 | int index = find_index_from_host_irq(assigned_dev, irq); | |
124 | u32 vector; | |
125 | ||
126 | if (index >= 0) { | |
127 | vector = assigned_dev->guest_msix_entries[index].vector; | |
07700a94 | 128 | kvm_assigned_dev_raise_guest_irq(assigned_dev, vector); |
cc079396 | 129 | } |
bfd99ff5 | 130 | |
bfd99ff5 AK |
131 | return IRQ_HANDLED; |
132 | } | |
cc079396 | 133 | #endif |
bfd99ff5 AK |
134 | |
135 | /* Ack the irq line for an assigned device */ | |
136 | static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian) | |
137 | { | |
c61fa9d6 JK |
138 | struct kvm_assigned_dev_kernel *dev = |
139 | container_of(kian, struct kvm_assigned_dev_kernel, | |
140 | ack_notifier); | |
bfd99ff5 AK |
141 | |
142 | kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0); | |
143 | ||
cf9eeac4 | 144 | spin_lock(&dev->intx_mask_lock); |
07700a94 JK |
145 | |
146 | if (!(dev->flags & KVM_DEV_ASSIGN_MASK_INTX)) { | |
147 | bool reassert = false; | |
148 | ||
149 | spin_lock_irq(&dev->intx_lock); | |
150 | /* | |
151 | * The guest IRQ may be shared so this ack can come from an | |
152 | * IRQ for another guest device. | |
153 | */ | |
154 | if (dev->host_irq_disabled) { | |
155 | if (!(dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) | |
156 | enable_irq(dev->host_irq); | |
157 | else if (!pci_check_and_unmask_intx(dev->dev)) | |
158 | reassert = true; | |
159 | dev->host_irq_disabled = reassert; | |
160 | } | |
161 | spin_unlock_irq(&dev->intx_lock); | |
162 | ||
163 | if (reassert) | |
164 | kvm_set_irq(dev->kvm, dev->irq_source_id, | |
165 | dev->guest_irq, 1); | |
bfd99ff5 | 166 | } |
07700a94 | 167 | |
cf9eeac4 | 168 | spin_unlock(&dev->intx_mask_lock); |
bfd99ff5 AK |
169 | } |
170 | ||
171 | static void deassign_guest_irq(struct kvm *kvm, | |
172 | struct kvm_assigned_dev_kernel *assigned_dev) | |
173 | { | |
c61fa9d6 JK |
174 | if (assigned_dev->ack_notifier.gsi != -1) |
175 | kvm_unregister_irq_ack_notifier(kvm, | |
176 | &assigned_dev->ack_notifier); | |
bfd99ff5 | 177 | |
0c106b5a JK |
178 | kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id, |
179 | assigned_dev->guest_irq, 0); | |
180 | ||
bfd99ff5 AK |
181 | if (assigned_dev->irq_source_id != -1) |
182 | kvm_free_irq_source_id(kvm, assigned_dev->irq_source_id); | |
183 | assigned_dev->irq_source_id = -1; | |
184 | assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_GUEST_MASK); | |
185 | } | |
186 | ||
187 | /* The function implicit hold kvm->lock mutex due to cancel_work_sync() */ | |
188 | static void deassign_host_irq(struct kvm *kvm, | |
189 | struct kvm_assigned_dev_kernel *assigned_dev) | |
190 | { | |
191 | /* | |
0645211c | 192 | * We disable irq here to prevent further events. |
bfd99ff5 AK |
193 | * |
194 | * Notice this maybe result in nested disable if the interrupt type is | |
195 | * INTx, but it's OK for we are going to free it. | |
196 | * | |
197 | * If this function is a part of VM destroy, please ensure that till | |
198 | * now, the kvm state is still legal for probably we also have to wait | |
0645211c | 199 | * on a currently running IRQ handler. |
bfd99ff5 AK |
200 | */ |
201 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX) { | |
202 | int i; | |
203 | for (i = 0; i < assigned_dev->entries_nr; i++) | |
0645211c | 204 | disable_irq(assigned_dev->host_msix_entries[i].vector); |
bfd99ff5 AK |
205 | |
206 | for (i = 0; i < assigned_dev->entries_nr; i++) | |
207 | free_irq(assigned_dev->host_msix_entries[i].vector, | |
9f9f6b78 | 208 | assigned_dev); |
bfd99ff5 AK |
209 | |
210 | assigned_dev->entries_nr = 0; | |
211 | kfree(assigned_dev->host_msix_entries); | |
212 | kfree(assigned_dev->guest_msix_entries); | |
213 | pci_disable_msix(assigned_dev->dev); | |
214 | } else { | |
215 | /* Deal with MSI and INTx */ | |
07700a94 JK |
216 | if ((assigned_dev->irq_requested_type & |
217 | KVM_DEV_IRQ_HOST_INTX) && | |
218 | (assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) { | |
219 | spin_lock_irq(&assigned_dev->intx_lock); | |
220 | pci_intx(assigned_dev->dev, false); | |
221 | spin_unlock_irq(&assigned_dev->intx_lock); | |
222 | synchronize_irq(assigned_dev->host_irq); | |
223 | } else | |
224 | disable_irq(assigned_dev->host_irq); | |
bfd99ff5 | 225 | |
9f9f6b78 | 226 | free_irq(assigned_dev->host_irq, assigned_dev); |
bfd99ff5 AK |
227 | |
228 | if (assigned_dev->irq_requested_type & KVM_DEV_IRQ_HOST_MSI) | |
229 | pci_disable_msi(assigned_dev->dev); | |
230 | } | |
231 | ||
232 | assigned_dev->irq_requested_type &= ~(KVM_DEV_IRQ_HOST_MASK); | |
233 | } | |
234 | ||
235 | static int kvm_deassign_irq(struct kvm *kvm, | |
236 | struct kvm_assigned_dev_kernel *assigned_dev, | |
237 | unsigned long irq_requested_type) | |
238 | { | |
239 | unsigned long guest_irq_type, host_irq_type; | |
240 | ||
241 | if (!irqchip_in_kernel(kvm)) | |
242 | return -EINVAL; | |
243 | /* no irq assignment to deassign */ | |
244 | if (!assigned_dev->irq_requested_type) | |
245 | return -ENXIO; | |
246 | ||
247 | host_irq_type = irq_requested_type & KVM_DEV_IRQ_HOST_MASK; | |
248 | guest_irq_type = irq_requested_type & KVM_DEV_IRQ_GUEST_MASK; | |
249 | ||
250 | if (host_irq_type) | |
251 | deassign_host_irq(kvm, assigned_dev); | |
252 | if (guest_irq_type) | |
253 | deassign_guest_irq(kvm, assigned_dev); | |
254 | ||
255 | return 0; | |
256 | } | |
257 | ||
258 | static void kvm_free_assigned_irq(struct kvm *kvm, | |
259 | struct kvm_assigned_dev_kernel *assigned_dev) | |
260 | { | |
261 | kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type); | |
262 | } | |
263 | ||
264 | static void kvm_free_assigned_device(struct kvm *kvm, | |
265 | struct kvm_assigned_dev_kernel | |
266 | *assigned_dev) | |
267 | { | |
268 | kvm_free_assigned_irq(kvm, assigned_dev); | |
269 | ||
f8fcfd77 AW |
270 | pci_reset_function(assigned_dev->dev); |
271 | if (pci_load_and_free_saved_state(assigned_dev->dev, | |
272 | &assigned_dev->pci_saved_state)) | |
273 | printk(KERN_INFO "%s: Couldn't reload %s saved state\n", | |
274 | __func__, dev_name(&assigned_dev->dev->dev)); | |
275 | else | |
276 | pci_restore_state(assigned_dev->dev); | |
bfd99ff5 | 277 | |
6777829c GR |
278 | assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED; |
279 | ||
bfd99ff5 AK |
280 | pci_release_regions(assigned_dev->dev); |
281 | pci_disable_device(assigned_dev->dev); | |
282 | pci_dev_put(assigned_dev->dev); | |
283 | ||
284 | list_del(&assigned_dev->list); | |
285 | kfree(assigned_dev); | |
286 | } | |
287 | ||
288 | void kvm_free_all_assigned_devices(struct kvm *kvm) | |
289 | { | |
290 | struct list_head *ptr, *ptr2; | |
291 | struct kvm_assigned_dev_kernel *assigned_dev; | |
292 | ||
293 | list_for_each_safe(ptr, ptr2, &kvm->arch.assigned_dev_head) { | |
294 | assigned_dev = list_entry(ptr, | |
295 | struct kvm_assigned_dev_kernel, | |
296 | list); | |
297 | ||
298 | kvm_free_assigned_device(kvm, assigned_dev); | |
299 | } | |
300 | } | |
301 | ||
302 | static int assigned_device_enable_host_intx(struct kvm *kvm, | |
303 | struct kvm_assigned_dev_kernel *dev) | |
304 | { | |
07700a94 JK |
305 | irq_handler_t irq_handler; |
306 | unsigned long flags; | |
307 | ||
bfd99ff5 | 308 | dev->host_irq = dev->dev->irq; |
07700a94 JK |
309 | |
310 | /* | |
311 | * We can only share the IRQ line with other host devices if we are | |
312 | * able to disable the IRQ source at device-level - independently of | |
313 | * the guest driver. Otherwise host devices may suffer from unbounded | |
314 | * IRQ latencies when the guest keeps the line asserted. | |
bfd99ff5 | 315 | */ |
07700a94 JK |
316 | if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) { |
317 | irq_handler = kvm_assigned_dev_intx; | |
318 | flags = IRQF_SHARED; | |
319 | } else { | |
320 | irq_handler = NULL; | |
321 | flags = IRQF_ONESHOT; | |
322 | } | |
323 | if (request_threaded_irq(dev->host_irq, irq_handler, | |
324 | kvm_assigned_dev_thread_intx, flags, | |
325 | dev->irq_name, dev)) | |
bfd99ff5 | 326 | return -EIO; |
07700a94 JK |
327 | |
328 | if (dev->flags & KVM_DEV_ASSIGN_PCI_2_3) { | |
329 | spin_lock_irq(&dev->intx_lock); | |
330 | pci_intx(dev->dev, true); | |
331 | spin_unlock_irq(&dev->intx_lock); | |
332 | } | |
bfd99ff5 AK |
333 | return 0; |
334 | } | |
335 | ||
336 | #ifdef __KVM_HAVE_MSI | |
337 | static int assigned_device_enable_host_msi(struct kvm *kvm, | |
338 | struct kvm_assigned_dev_kernel *dev) | |
339 | { | |
340 | int r; | |
341 | ||
342 | if (!dev->dev->msi_enabled) { | |
343 | r = pci_enable_msi(dev->dev); | |
344 | if (r) | |
345 | return r; | |
346 | } | |
347 | ||
348 | dev->host_irq = dev->dev->irq; | |
07700a94 JK |
349 | if (request_threaded_irq(dev->host_irq, NULL, |
350 | kvm_assigned_dev_thread_msi, 0, | |
351 | dev->irq_name, dev)) { | |
bfd99ff5 AK |
352 | pci_disable_msi(dev->dev); |
353 | return -EIO; | |
354 | } | |
355 | ||
356 | return 0; | |
357 | } | |
358 | #endif | |
359 | ||
360 | #ifdef __KVM_HAVE_MSIX | |
361 | static int assigned_device_enable_host_msix(struct kvm *kvm, | |
362 | struct kvm_assigned_dev_kernel *dev) | |
363 | { | |
364 | int i, r = -EINVAL; | |
365 | ||
366 | /* host_msix_entries and guest_msix_entries should have been | |
367 | * initialized */ | |
368 | if (dev->entries_nr == 0) | |
369 | return r; | |
370 | ||
371 | r = pci_enable_msix(dev->dev, dev->host_msix_entries, dev->entries_nr); | |
372 | if (r) | |
373 | return r; | |
374 | ||
375 | for (i = 0; i < dev->entries_nr; i++) { | |
0645211c | 376 | r = request_threaded_irq(dev->host_msix_entries[i].vector, |
cc079396 | 377 | NULL, kvm_assigned_dev_thread_msix, |
9f9f6b78 | 378 | 0, dev->irq_name, dev); |
bfd99ff5 | 379 | if (r) |
d57e2c07 | 380 | goto err; |
bfd99ff5 AK |
381 | } |
382 | ||
383 | return 0; | |
d57e2c07 | 384 | err: |
385 | for (i -= 1; i >= 0; i--) | |
9f9f6b78 | 386 | free_irq(dev->host_msix_entries[i].vector, dev); |
d57e2c07 | 387 | pci_disable_msix(dev->dev); |
388 | return r; | |
bfd99ff5 AK |
389 | } |
390 | ||
391 | #endif | |
392 | ||
393 | static int assigned_device_enable_guest_intx(struct kvm *kvm, | |
394 | struct kvm_assigned_dev_kernel *dev, | |
395 | struct kvm_assigned_irq *irq) | |
396 | { | |
397 | dev->guest_irq = irq->guest_irq; | |
398 | dev->ack_notifier.gsi = irq->guest_irq; | |
399 | return 0; | |
400 | } | |
401 | ||
402 | #ifdef __KVM_HAVE_MSI | |
403 | static int assigned_device_enable_guest_msi(struct kvm *kvm, | |
404 | struct kvm_assigned_dev_kernel *dev, | |
405 | struct kvm_assigned_irq *irq) | |
406 | { | |
407 | dev->guest_irq = irq->guest_irq; | |
408 | dev->ack_notifier.gsi = -1; | |
bfd99ff5 AK |
409 | return 0; |
410 | } | |
411 | #endif | |
412 | ||
413 | #ifdef __KVM_HAVE_MSIX | |
414 | static int assigned_device_enable_guest_msix(struct kvm *kvm, | |
415 | struct kvm_assigned_dev_kernel *dev, | |
416 | struct kvm_assigned_irq *irq) | |
417 | { | |
418 | dev->guest_irq = irq->guest_irq; | |
419 | dev->ack_notifier.gsi = -1; | |
bfd99ff5 AK |
420 | return 0; |
421 | } | |
422 | #endif | |
423 | ||
424 | static int assign_host_irq(struct kvm *kvm, | |
425 | struct kvm_assigned_dev_kernel *dev, | |
426 | __u32 host_irq_type) | |
427 | { | |
428 | int r = -EEXIST; | |
429 | ||
430 | if (dev->irq_requested_type & KVM_DEV_IRQ_HOST_MASK) | |
431 | return r; | |
432 | ||
1e001d49 JK |
433 | snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s", |
434 | pci_name(dev->dev)); | |
435 | ||
bfd99ff5 AK |
436 | switch (host_irq_type) { |
437 | case KVM_DEV_IRQ_HOST_INTX: | |
438 | r = assigned_device_enable_host_intx(kvm, dev); | |
439 | break; | |
440 | #ifdef __KVM_HAVE_MSI | |
441 | case KVM_DEV_IRQ_HOST_MSI: | |
442 | r = assigned_device_enable_host_msi(kvm, dev); | |
443 | break; | |
444 | #endif | |
445 | #ifdef __KVM_HAVE_MSIX | |
446 | case KVM_DEV_IRQ_HOST_MSIX: | |
447 | r = assigned_device_enable_host_msix(kvm, dev); | |
448 | break; | |
449 | #endif | |
450 | default: | |
451 | r = -EINVAL; | |
452 | } | |
07700a94 | 453 | dev->host_irq_disabled = false; |
bfd99ff5 AK |
454 | |
455 | if (!r) | |
456 | dev->irq_requested_type |= host_irq_type; | |
457 | ||
458 | return r; | |
459 | } | |
460 | ||
461 | static int assign_guest_irq(struct kvm *kvm, | |
462 | struct kvm_assigned_dev_kernel *dev, | |
463 | struct kvm_assigned_irq *irq, | |
464 | unsigned long guest_irq_type) | |
465 | { | |
466 | int id; | |
467 | int r = -EEXIST; | |
468 | ||
469 | if (dev->irq_requested_type & KVM_DEV_IRQ_GUEST_MASK) | |
470 | return r; | |
471 | ||
472 | id = kvm_request_irq_source_id(kvm); | |
473 | if (id < 0) | |
474 | return id; | |
475 | ||
476 | dev->irq_source_id = id; | |
477 | ||
478 | switch (guest_irq_type) { | |
479 | case KVM_DEV_IRQ_GUEST_INTX: | |
480 | r = assigned_device_enable_guest_intx(kvm, dev, irq); | |
481 | break; | |
482 | #ifdef __KVM_HAVE_MSI | |
483 | case KVM_DEV_IRQ_GUEST_MSI: | |
484 | r = assigned_device_enable_guest_msi(kvm, dev, irq); | |
485 | break; | |
486 | #endif | |
487 | #ifdef __KVM_HAVE_MSIX | |
488 | case KVM_DEV_IRQ_GUEST_MSIX: | |
489 | r = assigned_device_enable_guest_msix(kvm, dev, irq); | |
490 | break; | |
491 | #endif | |
492 | default: | |
493 | r = -EINVAL; | |
494 | } | |
495 | ||
496 | if (!r) { | |
497 | dev->irq_requested_type |= guest_irq_type; | |
c61fa9d6 JK |
498 | if (dev->ack_notifier.gsi != -1) |
499 | kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier); | |
bfd99ff5 AK |
500 | } else |
501 | kvm_free_irq_source_id(kvm, dev->irq_source_id); | |
502 | ||
503 | return r; | |
504 | } | |
505 | ||
506 | /* TODO Deal with KVM_DEV_IRQ_ASSIGNED_MASK_MSIX */ | |
507 | static int kvm_vm_ioctl_assign_irq(struct kvm *kvm, | |
508 | struct kvm_assigned_irq *assigned_irq) | |
509 | { | |
510 | int r = -EINVAL; | |
511 | struct kvm_assigned_dev_kernel *match; | |
512 | unsigned long host_irq_type, guest_irq_type; | |
513 | ||
bfd99ff5 AK |
514 | if (!irqchip_in_kernel(kvm)) |
515 | return r; | |
516 | ||
517 | mutex_lock(&kvm->lock); | |
518 | r = -ENODEV; | |
519 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
520 | assigned_irq->assigned_dev_id); | |
521 | if (!match) | |
522 | goto out; | |
523 | ||
524 | host_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_HOST_MASK); | |
525 | guest_irq_type = (assigned_irq->flags & KVM_DEV_IRQ_GUEST_MASK); | |
526 | ||
527 | r = -EINVAL; | |
528 | /* can only assign one type at a time */ | |
529 | if (hweight_long(host_irq_type) > 1) | |
530 | goto out; | |
531 | if (hweight_long(guest_irq_type) > 1) | |
532 | goto out; | |
533 | if (host_irq_type == 0 && guest_irq_type == 0) | |
534 | goto out; | |
535 | ||
536 | r = 0; | |
537 | if (host_irq_type) | |
538 | r = assign_host_irq(kvm, match, host_irq_type); | |
539 | if (r) | |
540 | goto out; | |
541 | ||
542 | if (guest_irq_type) | |
543 | r = assign_guest_irq(kvm, match, assigned_irq, guest_irq_type); | |
544 | out: | |
545 | mutex_unlock(&kvm->lock); | |
546 | return r; | |
547 | } | |
548 | ||
549 | static int kvm_vm_ioctl_deassign_dev_irq(struct kvm *kvm, | |
550 | struct kvm_assigned_irq | |
551 | *assigned_irq) | |
552 | { | |
553 | int r = -ENODEV; | |
554 | struct kvm_assigned_dev_kernel *match; | |
07700a94 | 555 | unsigned long irq_type; |
bfd99ff5 AK |
556 | |
557 | mutex_lock(&kvm->lock); | |
558 | ||
559 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
560 | assigned_irq->assigned_dev_id); | |
561 | if (!match) | |
562 | goto out; | |
563 | ||
07700a94 JK |
564 | irq_type = assigned_irq->flags & (KVM_DEV_IRQ_HOST_MASK | |
565 | KVM_DEV_IRQ_GUEST_MASK); | |
566 | r = kvm_deassign_irq(kvm, match, irq_type); | |
bfd99ff5 AK |
567 | out: |
568 | mutex_unlock(&kvm->lock); | |
569 | return r; | |
570 | } | |
571 | ||
3d27e23b AW |
572 | /* |
573 | * We want to test whether the caller has been granted permissions to | |
574 | * use this device. To be able to configure and control the device, | |
575 | * the user needs access to PCI configuration space and BAR resources. | |
576 | * These are accessed through PCI sysfs. PCI config space is often | |
577 | * passed to the process calling this ioctl via file descriptor, so we | |
578 | * can't rely on access to that file. We can check for permissions | |
579 | * on each of the BAR resource files, which is a pretty clear | |
580 | * indicator that the user has been granted access to the device. | |
581 | */ | |
582 | static int probe_sysfs_permissions(struct pci_dev *dev) | |
583 | { | |
584 | #ifdef CONFIG_SYSFS | |
585 | int i; | |
586 | bool bar_found = false; | |
587 | ||
588 | for (i = PCI_STD_RESOURCES; i <= PCI_STD_RESOURCE_END; i++) { | |
589 | char *kpath, *syspath; | |
590 | struct path path; | |
591 | struct inode *inode; | |
592 | int r; | |
593 | ||
594 | if (!pci_resource_len(dev, i)) | |
595 | continue; | |
596 | ||
597 | kpath = kobject_get_path(&dev->dev.kobj, GFP_KERNEL); | |
598 | if (!kpath) | |
599 | return -ENOMEM; | |
600 | ||
601 | /* Per sysfs-rules, sysfs is always at /sys */ | |
602 | syspath = kasprintf(GFP_KERNEL, "/sys%s/resource%d", kpath, i); | |
603 | kfree(kpath); | |
604 | if (!syspath) | |
605 | return -ENOMEM; | |
606 | ||
607 | r = kern_path(syspath, LOOKUP_FOLLOW, &path); | |
608 | kfree(syspath); | |
609 | if (r) | |
610 | return r; | |
611 | ||
612 | inode = path.dentry->d_inode; | |
613 | ||
614 | r = inode_permission(inode, MAY_READ | MAY_WRITE | MAY_ACCESS); | |
615 | path_put(&path); | |
616 | if (r) | |
617 | return r; | |
618 | ||
619 | bar_found = true; | |
620 | } | |
621 | ||
622 | /* If no resources, probably something special */ | |
623 | if (!bar_found) | |
624 | return -EPERM; | |
625 | ||
626 | return 0; | |
627 | #else | |
628 | return -EINVAL; /* No way to control the device without sysfs */ | |
629 | #endif | |
630 | } | |
631 | ||
bfd99ff5 AK |
632 | static int kvm_vm_ioctl_assign_device(struct kvm *kvm, |
633 | struct kvm_assigned_pci_dev *assigned_dev) | |
634 | { | |
bc6678a3 | 635 | int r = 0, idx; |
bfd99ff5 AK |
636 | struct kvm_assigned_dev_kernel *match; |
637 | struct pci_dev *dev; | |
638 | ||
42387373 AW |
639 | if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU)) |
640 | return -EINVAL; | |
641 | ||
bfd99ff5 | 642 | mutex_lock(&kvm->lock); |
bc6678a3 | 643 | idx = srcu_read_lock(&kvm->srcu); |
bfd99ff5 AK |
644 | |
645 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
646 | assigned_dev->assigned_dev_id); | |
647 | if (match) { | |
648 | /* device already assigned */ | |
649 | r = -EEXIST; | |
650 | goto out; | |
651 | } | |
652 | ||
653 | match = kzalloc(sizeof(struct kvm_assigned_dev_kernel), GFP_KERNEL); | |
654 | if (match == NULL) { | |
655 | printk(KERN_INFO "%s: Couldn't allocate memory\n", | |
656 | __func__); | |
657 | r = -ENOMEM; | |
658 | goto out; | |
659 | } | |
ab9f4ecb ZE |
660 | dev = pci_get_domain_bus_and_slot(assigned_dev->segnr, |
661 | assigned_dev->busnr, | |
bfd99ff5 AK |
662 | assigned_dev->devfn); |
663 | if (!dev) { | |
664 | printk(KERN_INFO "%s: host device not found\n", __func__); | |
665 | r = -EINVAL; | |
666 | goto out_free; | |
667 | } | |
3d27e23b AW |
668 | |
669 | /* Don't allow bridges to be assigned */ | |
f961f728 | 670 | if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) { |
3d27e23b AW |
671 | r = -EPERM; |
672 | goto out_put; | |
673 | } | |
674 | ||
675 | r = probe_sysfs_permissions(dev); | |
676 | if (r) | |
677 | goto out_put; | |
678 | ||
bfd99ff5 AK |
679 | if (pci_enable_device(dev)) { |
680 | printk(KERN_INFO "%s: Could not enable PCI device\n", __func__); | |
681 | r = -EBUSY; | |
682 | goto out_put; | |
683 | } | |
684 | r = pci_request_regions(dev, "kvm_assigned_device"); | |
685 | if (r) { | |
686 | printk(KERN_INFO "%s: Could not get access to device regions\n", | |
687 | __func__); | |
688 | goto out_disable; | |
689 | } | |
690 | ||
691 | pci_reset_function(dev); | |
ed78661f | 692 | pci_save_state(dev); |
f8fcfd77 AW |
693 | match->pci_saved_state = pci_store_saved_state(dev); |
694 | if (!match->pci_saved_state) | |
695 | printk(KERN_DEBUG "%s: Couldn't store %s saved state\n", | |
696 | __func__, dev_name(&dev->dev)); | |
07700a94 JK |
697 | |
698 | if (!pci_intx_mask_supported(dev)) | |
699 | assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3; | |
700 | ||
bfd99ff5 | 701 | match->assigned_dev_id = assigned_dev->assigned_dev_id; |
ab9f4ecb | 702 | match->host_segnr = assigned_dev->segnr; |
bfd99ff5 AK |
703 | match->host_busnr = assigned_dev->busnr; |
704 | match->host_devfn = assigned_dev->devfn; | |
705 | match->flags = assigned_dev->flags; | |
706 | match->dev = dev; | |
0645211c | 707 | spin_lock_init(&match->intx_lock); |
cf9eeac4 | 708 | spin_lock_init(&match->intx_mask_lock); |
bfd99ff5 AK |
709 | match->irq_source_id = -1; |
710 | match->kvm = kvm; | |
711 | match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq; | |
bfd99ff5 AK |
712 | |
713 | list_add(&match->list, &kvm->arch.assigned_dev_head); | |
714 | ||
42387373 AW |
715 | if (!kvm->arch.iommu_domain) { |
716 | r = kvm_iommu_map_guest(kvm); | |
bfd99ff5 AK |
717 | if (r) |
718 | goto out_list_del; | |
719 | } | |
42387373 AW |
720 | r = kvm_assign_device(kvm, match); |
721 | if (r) | |
722 | goto out_list_del; | |
bfd99ff5 AK |
723 | |
724 | out: | |
bc6678a3 | 725 | srcu_read_unlock(&kvm->srcu, idx); |
fae3a353 | 726 | mutex_unlock(&kvm->lock); |
bfd99ff5 AK |
727 | return r; |
728 | out_list_del: | |
f8fcfd77 AW |
729 | if (pci_load_and_free_saved_state(dev, &match->pci_saved_state)) |
730 | printk(KERN_INFO "%s: Couldn't reload %s saved state\n", | |
731 | __func__, dev_name(&dev->dev)); | |
bfd99ff5 AK |
732 | list_del(&match->list); |
733 | pci_release_regions(dev); | |
734 | out_disable: | |
735 | pci_disable_device(dev); | |
736 | out_put: | |
737 | pci_dev_put(dev); | |
738 | out_free: | |
739 | kfree(match); | |
bc6678a3 | 740 | srcu_read_unlock(&kvm->srcu, idx); |
fae3a353 | 741 | mutex_unlock(&kvm->lock); |
bfd99ff5 AK |
742 | return r; |
743 | } | |
744 | ||
745 | static int kvm_vm_ioctl_deassign_device(struct kvm *kvm, | |
746 | struct kvm_assigned_pci_dev *assigned_dev) | |
747 | { | |
748 | int r = 0; | |
749 | struct kvm_assigned_dev_kernel *match; | |
750 | ||
751 | mutex_lock(&kvm->lock); | |
752 | ||
753 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
754 | assigned_dev->assigned_dev_id); | |
755 | if (!match) { | |
756 | printk(KERN_INFO "%s: device hasn't been assigned before, " | |
757 | "so cannot be deassigned\n", __func__); | |
758 | r = -EINVAL; | |
759 | goto out; | |
760 | } | |
761 | ||
42387373 | 762 | kvm_deassign_device(kvm, match); |
bfd99ff5 AK |
763 | |
764 | kvm_free_assigned_device(kvm, match); | |
765 | ||
766 | out: | |
767 | mutex_unlock(&kvm->lock); | |
768 | return r; | |
769 | } | |
770 | ||
771 | ||
772 | #ifdef __KVM_HAVE_MSIX | |
773 | static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm, | |
774 | struct kvm_assigned_msix_nr *entry_nr) | |
775 | { | |
776 | int r = 0; | |
777 | struct kvm_assigned_dev_kernel *adev; | |
778 | ||
779 | mutex_lock(&kvm->lock); | |
780 | ||
781 | adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
782 | entry_nr->assigned_dev_id); | |
783 | if (!adev) { | |
784 | r = -EINVAL; | |
785 | goto msix_nr_out; | |
786 | } | |
787 | ||
788 | if (adev->entries_nr == 0) { | |
789 | adev->entries_nr = entry_nr->entry_nr; | |
790 | if (adev->entries_nr == 0 || | |
9f3191ae | 791 | adev->entries_nr > KVM_MAX_MSIX_PER_DEV) { |
bfd99ff5 AK |
792 | r = -EINVAL; |
793 | goto msix_nr_out; | |
794 | } | |
795 | ||
796 | adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) * | |
797 | entry_nr->entry_nr, | |
798 | GFP_KERNEL); | |
799 | if (!adev->host_msix_entries) { | |
800 | r = -ENOMEM; | |
801 | goto msix_nr_out; | |
802 | } | |
0645211c JK |
803 | adev->guest_msix_entries = |
804 | kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr, | |
805 | GFP_KERNEL); | |
bfd99ff5 AK |
806 | if (!adev->guest_msix_entries) { |
807 | kfree(adev->host_msix_entries); | |
808 | r = -ENOMEM; | |
809 | goto msix_nr_out; | |
810 | } | |
811 | } else /* Not allowed set MSI-X number twice */ | |
812 | r = -EINVAL; | |
813 | msix_nr_out: | |
814 | mutex_unlock(&kvm->lock); | |
815 | return r; | |
816 | } | |
817 | ||
818 | static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm, | |
819 | struct kvm_assigned_msix_entry *entry) | |
820 | { | |
821 | int r = 0, i; | |
822 | struct kvm_assigned_dev_kernel *adev; | |
823 | ||
824 | mutex_lock(&kvm->lock); | |
825 | ||
826 | adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
827 | entry->assigned_dev_id); | |
828 | ||
829 | if (!adev) { | |
830 | r = -EINVAL; | |
831 | goto msix_entry_out; | |
832 | } | |
833 | ||
834 | for (i = 0; i < adev->entries_nr; i++) | |
835 | if (adev->guest_msix_entries[i].vector == 0 || | |
836 | adev->guest_msix_entries[i].entry == entry->entry) { | |
837 | adev->guest_msix_entries[i].entry = entry->entry; | |
838 | adev->guest_msix_entries[i].vector = entry->gsi; | |
839 | adev->host_msix_entries[i].entry = entry->entry; | |
840 | break; | |
841 | } | |
842 | if (i == adev->entries_nr) { | |
843 | r = -ENOSPC; | |
844 | goto msix_entry_out; | |
845 | } | |
846 | ||
847 | msix_entry_out: | |
848 | mutex_unlock(&kvm->lock); | |
849 | ||
850 | return r; | |
851 | } | |
852 | #endif | |
853 | ||
07700a94 JK |
854 | static int kvm_vm_ioctl_set_pci_irq_mask(struct kvm *kvm, |
855 | struct kvm_assigned_pci_dev *assigned_dev) | |
856 | { | |
857 | int r = 0; | |
858 | struct kvm_assigned_dev_kernel *match; | |
859 | ||
860 | mutex_lock(&kvm->lock); | |
861 | ||
862 | match = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head, | |
863 | assigned_dev->assigned_dev_id); | |
864 | if (!match) { | |
865 | r = -ENODEV; | |
866 | goto out; | |
867 | } | |
868 | ||
cf9eeac4 | 869 | spin_lock(&match->intx_mask_lock); |
07700a94 JK |
870 | |
871 | match->flags &= ~KVM_DEV_ASSIGN_MASK_INTX; | |
872 | match->flags |= assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX; | |
873 | ||
874 | if (match->irq_requested_type & KVM_DEV_IRQ_GUEST_INTX) { | |
875 | if (assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX) { | |
876 | kvm_set_irq(match->kvm, match->irq_source_id, | |
877 | match->guest_irq, 0); | |
878 | /* | |
879 | * Masking at hardware-level is performed on demand, | |
880 | * i.e. when an IRQ actually arrives at the host. | |
881 | */ | |
882 | } else if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) { | |
883 | /* | |
884 | * Unmask the IRQ line if required. Unmasking at | |
885 | * device level will be performed by user space. | |
886 | */ | |
887 | spin_lock_irq(&match->intx_lock); | |
888 | if (match->host_irq_disabled) { | |
889 | enable_irq(match->host_irq); | |
890 | match->host_irq_disabled = false; | |
891 | } | |
892 | spin_unlock_irq(&match->intx_lock); | |
893 | } | |
894 | } | |
895 | ||
cf9eeac4 | 896 | spin_unlock(&match->intx_mask_lock); |
07700a94 JK |
897 | |
898 | out: | |
899 | mutex_unlock(&kvm->lock); | |
900 | return r; | |
901 | } | |
902 | ||
bfd99ff5 AK |
903 | long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl, |
904 | unsigned long arg) | |
905 | { | |
906 | void __user *argp = (void __user *)arg; | |
51de271d | 907 | int r; |
bfd99ff5 AK |
908 | |
909 | switch (ioctl) { | |
910 | case KVM_ASSIGN_PCI_DEVICE: { | |
911 | struct kvm_assigned_pci_dev assigned_dev; | |
912 | ||
913 | r = -EFAULT; | |
914 | if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) | |
915 | goto out; | |
916 | r = kvm_vm_ioctl_assign_device(kvm, &assigned_dev); | |
917 | if (r) | |
918 | goto out; | |
919 | break; | |
920 | } | |
921 | case KVM_ASSIGN_IRQ: { | |
922 | r = -EOPNOTSUPP; | |
923 | break; | |
924 | } | |
bfd99ff5 AK |
925 | case KVM_ASSIGN_DEV_IRQ: { |
926 | struct kvm_assigned_irq assigned_irq; | |
927 | ||
928 | r = -EFAULT; | |
929 | if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) | |
930 | goto out; | |
931 | r = kvm_vm_ioctl_assign_irq(kvm, &assigned_irq); | |
932 | if (r) | |
933 | goto out; | |
934 | break; | |
935 | } | |
936 | case KVM_DEASSIGN_DEV_IRQ: { | |
937 | struct kvm_assigned_irq assigned_irq; | |
938 | ||
939 | r = -EFAULT; | |
940 | if (copy_from_user(&assigned_irq, argp, sizeof assigned_irq)) | |
941 | goto out; | |
942 | r = kvm_vm_ioctl_deassign_dev_irq(kvm, &assigned_irq); | |
943 | if (r) | |
944 | goto out; | |
945 | break; | |
946 | } | |
bfd99ff5 AK |
947 | case KVM_DEASSIGN_PCI_DEVICE: { |
948 | struct kvm_assigned_pci_dev assigned_dev; | |
949 | ||
950 | r = -EFAULT; | |
951 | if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) | |
952 | goto out; | |
953 | r = kvm_vm_ioctl_deassign_device(kvm, &assigned_dev); | |
954 | if (r) | |
955 | goto out; | |
956 | break; | |
957 | } | |
bfd99ff5 AK |
958 | #ifdef KVM_CAP_IRQ_ROUTING |
959 | case KVM_SET_GSI_ROUTING: { | |
960 | struct kvm_irq_routing routing; | |
961 | struct kvm_irq_routing __user *urouting; | |
962 | struct kvm_irq_routing_entry *entries; | |
963 | ||
964 | r = -EFAULT; | |
965 | if (copy_from_user(&routing, argp, sizeof(routing))) | |
966 | goto out; | |
967 | r = -EINVAL; | |
968 | if (routing.nr >= KVM_MAX_IRQ_ROUTES) | |
969 | goto out; | |
970 | if (routing.flags) | |
971 | goto out; | |
972 | r = -ENOMEM; | |
973 | entries = vmalloc(routing.nr * sizeof(*entries)); | |
974 | if (!entries) | |
975 | goto out; | |
976 | r = -EFAULT; | |
977 | urouting = argp; | |
978 | if (copy_from_user(entries, urouting->entries, | |
979 | routing.nr * sizeof(*entries))) | |
980 | goto out_free_irq_routing; | |
981 | r = kvm_set_irq_routing(kvm, entries, routing.nr, | |
982 | routing.flags); | |
983 | out_free_irq_routing: | |
984 | vfree(entries); | |
985 | break; | |
986 | } | |
987 | #endif /* KVM_CAP_IRQ_ROUTING */ | |
988 | #ifdef __KVM_HAVE_MSIX | |
989 | case KVM_ASSIGN_SET_MSIX_NR: { | |
990 | struct kvm_assigned_msix_nr entry_nr; | |
991 | r = -EFAULT; | |
992 | if (copy_from_user(&entry_nr, argp, sizeof entry_nr)) | |
993 | goto out; | |
994 | r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr); | |
995 | if (r) | |
996 | goto out; | |
997 | break; | |
998 | } | |
999 | case KVM_ASSIGN_SET_MSIX_ENTRY: { | |
1000 | struct kvm_assigned_msix_entry entry; | |
1001 | r = -EFAULT; | |
1002 | if (copy_from_user(&entry, argp, sizeof entry)) | |
1003 | goto out; | |
1004 | r = kvm_vm_ioctl_set_msix_entry(kvm, &entry); | |
1005 | if (r) | |
1006 | goto out; | |
1007 | break; | |
1008 | } | |
1009 | #endif | |
07700a94 JK |
1010 | case KVM_ASSIGN_SET_INTX_MASK: { |
1011 | struct kvm_assigned_pci_dev assigned_dev; | |
1012 | ||
1013 | r = -EFAULT; | |
1014 | if (copy_from_user(&assigned_dev, argp, sizeof assigned_dev)) | |
1015 | goto out; | |
1016 | r = kvm_vm_ioctl_set_pci_irq_mask(kvm, &assigned_dev); | |
1017 | break; | |
1018 | } | |
51de271d JK |
1019 | default: |
1020 | r = -ENOTTY; | |
1021 | break; | |
bfd99ff5 AK |
1022 | } |
1023 | out: | |
1024 | return r; | |
1025 | } |