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Avi Kivitybfd99ff2009-08-26 14:57:50 +03001/*
2 * Kernel-based Virtual Machine - device assignment support
3 *
Avi Kivity221d0592010-05-23 18:37:00 +03004 * Copyright (C) 2010 Red Hat, Inc. and/or its affiliates.
Avi Kivitybfd99ff2009-08-26 14:57:50 +03005 *
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>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090019#include <linux/slab.h>
Alex Williamson3d27e232011-12-20 21:59:09 -070020#include <linux/namei.h>
21#include <linux/fs.h>
Avi Kivitybfd99ff2009-08-26 14:57:50 +030022#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 }
Michael S. Tsirkinb93a3552012-01-18 20:07:09 +020052 if (index < 0)
Avi Kivitybfd99ff2009-08-26 14:57:50 +030053 printk(KERN_WARNING "Fail to find correlated MSI-X entry!\n");
Avi Kivitybfd99ff2009-08-26 14:57:50 +030054
55 return index;
56}
57
Jan Kiszka07700a92012-02-28 14:19:54 +010058static 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)) {
Jan Kiszkacf9eeac2012-03-14 11:02:11 +010080 spin_lock(&assigned_dev->intx_mask_lock);
Jan Kiszka07700a92012-02-28 14:19:54 +010081 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_MASK_INTX))
82 kvm_set_irq(assigned_dev->kvm,
Yang Zhangaa2fbe62013-04-11 19:21:40 +080083 assigned_dev->irq_source_id, vector, 1,
84 false);
Jan Kiszkacf9eeac2012-03-14 11:02:11 +010085 spin_unlock(&assigned_dev->intx_mask_lock);
Jan Kiszka07700a92012-02-28 14:19:54 +010086 } else
87 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +080088 vector, 1, false);
Jan Kiszka07700a92012-02-28 14:19:54 +010089}
90
91static irqreturn_t kvm_assigned_dev_thread_intx(int irq, void *dev_id)
Avi Kivitybfd99ff2009-08-26 14:57:50 +030092{
Jan Kiszka06452112010-11-16 22:30:03 +010093 struct kvm_assigned_dev_kernel *assigned_dev = dev_id;
Avi Kivitybfd99ff2009-08-26 14:57:50 +030094
Jan Kiszka07700a92012-02-28 14:19:54 +010095 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_PCI_2_3)) {
96 spin_lock_irq(&assigned_dev->intx_lock);
Jan Kiszka06452112010-11-16 22:30:03 +010097 disable_irq_nosync(irq);
98 assigned_dev->host_irq_disabled = true;
Jan Kiszka07700a92012-02-28 14:19:54 +010099 spin_unlock_irq(&assigned_dev->intx_lock);
Jan Kiszka06452112010-11-16 22:30:03 +0100100 }
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300101
Jan Kiszka07700a92012-02-28 14:19:54 +0100102 kvm_assigned_dev_raise_guest_irq(assigned_dev,
103 assigned_dev->guest_irq);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300104
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300105 return IRQ_HANDLED;
106}
107
Jan Kiszka07700a92012-02-28 14:19:54 +0100108#ifdef __KVM_HAVE_MSI
Michael S. Tsirkin78c63442012-10-17 18:06:06 +0200109static 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
Jan Kiszka07700a92012-02-28 14:19:54 +0100118static 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
Jan Kiszkacc079392011-09-12 18:57:56 +0200129#ifdef __KVM_HAVE_MSIX
Michael S. Tsirkin78c63442012-10-17 18:06:06 +0200130static 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
Jan Kiszkacc079392011-09-12 18:57:56 +0200147static 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;
Jan Kiszka07700a92012-02-28 14:19:54 +0100155 kvm_assigned_dev_raise_guest_irq(assigned_dev, vector);
Jan Kiszkacc079392011-09-12 18:57:56 +0200156 }
157
158 return IRQ_HANDLED;
159}
160#endif
161
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300162/* Ack the irq line for an assigned device */
163static void kvm_assigned_dev_ack_irq(struct kvm_irq_ack_notifier *kian)
164{
Jan Kiszkac61fa9d2011-09-11 10:16:20 +0200165 struct kvm_assigned_dev_kernel *dev =
166 container_of(kian, struct kvm_assigned_dev_kernel,
167 ack_notifier);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300168
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800169 kvm_set_irq(dev->kvm, dev->irq_source_id, dev->guest_irq, 0, false);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300170
Jan Kiszkacf9eeac2012-03-14 11:02:11 +0100171 spin_lock(&dev->intx_mask_lock);
Jan Kiszka07700a92012-02-28 14:19:54 +0100172
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,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800192 dev->guest_irq, 1, false);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300193 }
Jan Kiszka07700a92012-02-28 14:19:54 +0100194
Jan Kiszkacf9eeac2012-03-14 11:02:11 +0100195 spin_unlock(&dev->intx_mask_lock);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300196}
197
198static void deassign_guest_irq(struct kvm *kvm,
199 struct kvm_assigned_dev_kernel *assigned_dev)
200{
Jan Kiszkac61fa9d2011-09-11 10:16:20 +0200201 if (assigned_dev->ack_notifier.gsi != -1)
202 kvm_unregister_irq_ack_notifier(kvm,
203 &assigned_dev->ack_notifier);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300204
Jan Kiszka0c106b52010-11-16 22:30:02 +0100205 kvm_set_irq(assigned_dev->kvm, assigned_dev->irq_source_id,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800206 assigned_dev->guest_irq, 0, false);
Jan Kiszka0c106b52010-11-16 22:30:02 +0100207
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300208 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 /*
Jan Kiszka06452112010-11-16 22:30:03 +0100219 * We disable irq here to prevent further events.
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300220 *
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
Jan Kiszka06452112010-11-16 22:30:03 +0100226 * on a currently running IRQ handler.
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300227 */
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++)
Jan Kiszka06452112010-11-16 22:30:03 +0100231 disable_irq(assigned_dev->host_msix_entries[i].vector);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300232
233 for (i = 0; i < assigned_dev->entries_nr; i++)
234 free_irq(assigned_dev->host_msix_entries[i].vector,
Jan Kiszka9f9f6b72011-09-11 10:16:16 +0200235 assigned_dev);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300236
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 */
Jan Kiszka07700a92012-02-28 14:19:54 +0100243 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);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300252
Jan Kiszka9f9f6b72011-09-11 10:16:16 +0200253 free_irq(assigned_dev->host_irq, assigned_dev);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300254
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
Alex Williamsonf8fcfd72011-05-10 10:02:39 -0600297 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);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300304
Greg Rose67778292011-07-22 05:46:07 +0000305 assigned_dev->dev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
306
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300307 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{
Jan Kiszka07700a92012-02-28 14:19:54 +0100332 irq_handler_t irq_handler;
333 unsigned long flags;
334
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300335 dev->host_irq = dev->dev->irq;
Jan Kiszka07700a92012-02-28 14:19:54 +0100336
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.
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300342 */
Jan Kiszka07700a92012-02-28 14:19:54 +0100343 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))
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300353 return -EIO;
Jan Kiszka07700a92012-02-28 14:19:54 +0100354
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 }
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300360 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;
Alex Williamsona76beb12012-07-09 10:53:22 -0600376 if (request_threaded_irq(dev->host_irq, kvm_assigned_dev_msi,
Jan Kiszka07700a92012-02-28 14:19:54 +0100377 kvm_assigned_dev_thread_msi, 0,
378 dev->irq_name, dev)) {
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300379 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
Alexander Gordeeve8e249d2014-02-21 18:05:05 +0100398 r = pci_enable_msix_exact(dev->dev,
399 dev->host_msix_entries, dev->entries_nr);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300400 if (r)
401 return r;
402
403 for (i = 0; i < dev->entries_nr; i++) {
Jan Kiszka06452112010-11-16 22:30:03 +0100404 r = request_threaded_irq(dev->host_msix_entries[i].vector,
Alex Williamsona76beb12012-07-09 10:53:22 -0600405 kvm_assigned_dev_msix,
406 kvm_assigned_dev_thread_msix,
Jan Kiszka9f9f6b72011-09-11 10:16:16 +0200407 0, dev->irq_name, dev);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300408 if (r)
jing zhangd57e2c02010-03-13 15:00:45 +0800409 goto err;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300410 }
411
412 return 0;
jing zhangd57e2c02010-03-13 15:00:45 +0800413err:
414 for (i -= 1; i >= 0; i--)
Jan Kiszka9f9f6b72011-09-11 10:16:16 +0200415 free_irq(dev->host_msix_entries[i].vector, dev);
jing zhangd57e2c02010-03-13 15:00:45 +0800416 pci_disable_msix(dev->dev);
417 return r;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300418}
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;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300438 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;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300449 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
Jan Kiszka1e001d42010-11-16 22:30:04 +0100462 snprintf(dev->irq_name, sizeof(dev->irq_name), "kvm:%s",
463 pci_name(dev->dev));
464
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300465 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 }
Jan Kiszka07700a92012-02-28 14:19:54 +0100482 dev->host_irq_disabled = false;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300483
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;
Jan Kiszkac61fa9d2011-09-11 10:16:20 +0200527 if (dev->ack_notifier.gsi != -1)
528 kvm_register_irq_ack_notifier(kvm, &dev->ack_notifier);
Chen Gang30d1e0e2014-08-08 23:37:59 +0800529 } else {
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300530 kvm_free_irq_source_id(kvm, dev->irq_source_id);
Chen Gang30d1e0e2014-08-08 23:37:59 +0800531 dev->irq_source_id = -1;
532 }
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300533
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
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300545 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;
Jan Kiszka07700a92012-02-28 14:19:54 +0100586 unsigned long irq_type;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300587
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
Jan Kiszka07700a92012-02-28 14:19:54 +0100595 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);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300598out:
599 mutex_unlock(&kvm->lock);
600 return r;
601}
602
Alex Williamson3d27e232011-12-20 21:59:09 -0700603/*
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
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300663static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
664 struct kvm_assigned_pci_dev *assigned_dev)
665{
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200666 int r = 0, idx;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300667 struct kvm_assigned_dev_kernel *match;
668 struct pci_dev *dev;
669
Alex Williamson42387372011-12-20 21:59:03 -0700670 if (!(assigned_dev->flags & KVM_DEV_ASSIGN_ENABLE_IOMMU))
671 return -EINVAL;
672
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300673 mutex_lock(&kvm->lock);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200674 idx = srcu_read_lock(&kvm->srcu);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300675
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 }
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800691 dev = pci_get_domain_bus_and_slot(assigned_dev->segnr,
692 assigned_dev->busnr,
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300693 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 }
Alex Williamson3d27e232011-12-20 21:59:09 -0700699
700 /* Don't allow bridges to be assigned */
Jan Kiszkaf961f722012-06-15 07:56:20 -0600701 if (dev->hdr_type != PCI_HEADER_TYPE_NORMAL) {
Alex Williamson3d27e232011-12-20 21:59:09 -0700702 r = -EPERM;
703 goto out_put;
704 }
705
706 r = probe_sysfs_permissions(dev);
707 if (r)
708 goto out_put;
709
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300710 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);
Jan Kiszkaed786612010-11-16 22:30:05 +0100723 pci_save_state(dev);
Alex Williamsonf8fcfd72011-05-10 10:02:39 -0600724 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));
Jan Kiszka07700a92012-02-28 14:19:54 +0100728
729 if (!pci_intx_mask_supported(dev))
730 assigned_dev->flags &= ~KVM_DEV_ASSIGN_PCI_2_3;
731
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300732 match->assigned_dev_id = assigned_dev->assigned_dev_id;
Zhai, Edwinab9f4ec2010-01-29 14:38:44 +0800733 match->host_segnr = assigned_dev->segnr;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300734 match->host_busnr = assigned_dev->busnr;
735 match->host_devfn = assigned_dev->devfn;
736 match->flags = assigned_dev->flags;
737 match->dev = dev;
Jan Kiszka06452112010-11-16 22:30:03 +0100738 spin_lock_init(&match->intx_lock);
Jan Kiszkacf9eeac2012-03-14 11:02:11 +0100739 spin_lock_init(&match->intx_mask_lock);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300740 match->irq_source_id = -1;
741 match->kvm = kvm;
742 match->ack_notifier.irq_acked = kvm_assigned_dev_ack_irq;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300743
744 list_add(&match->list, &kvm->arch.assigned_dev_head);
745
Alex Williamson42387372011-12-20 21:59:03 -0700746 if (!kvm->arch.iommu_domain) {
747 r = kvm_iommu_map_guest(kvm);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300748 if (r)
749 goto out_list_del;
750 }
Alex Williamson42387372011-12-20 21:59:03 -0700751 r = kvm_assign_device(kvm, match);
752 if (r)
753 goto out_list_del;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300754
755out:
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200756 srcu_read_unlock(&kvm->srcu, idx);
Sheng Yangfae3a352009-12-15 10:28:07 +0800757 mutex_unlock(&kvm->lock);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300758 return r;
759out_list_del:
Alex Williamsonf8fcfd72011-05-10 10:02:39 -0600760 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));
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300763 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);
Marcelo Tosattibc6678a2009-12-23 14:35:21 -0200771 srcu_read_unlock(&kvm->srcu, idx);
Sheng Yangfae3a352009-12-15 10:28:07 +0800772 mutex_unlock(&kvm->lock);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300773 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
Alex Williamson42387372011-12-20 21:59:03 -0700793 kvm_deassign_device(kvm, match);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300794
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 ||
Jan Kiszka9f3191a2011-06-11 12:23:55 +0200822 adev->entries_nr > KVM_MAX_MSIX_PER_DEV) {
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300823 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 }
Jan Kiszka06452112010-11-16 22:30:03 +0100834 adev->guest_msix_entries =
835 kzalloc(sizeof(struct msix_entry) * entry_nr->entry_nr,
836 GFP_KERNEL);
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300837 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
Jan Kiszka07700a92012-02-28 14:19:54 +0100885static 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
Jan Kiszkacf9eeac2012-03-14 11:02:11 +0100900 spin_lock(&match->intx_mask_lock);
Jan Kiszka07700a92012-02-28 14:19:54 +0100901
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,
Yang Zhangaa2fbe62013-04-11 19:21:40 +0800908 match->guest_irq, 0, false);
Jan Kiszka07700a92012-02-28 14:19:54 +0100909 /*
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
Jan Kiszkacf9eeac2012-03-14 11:02:11 +0100927 spin_unlock(&match->intx_mask_lock);
Jan Kiszka07700a92012-02-28 14:19:54 +0100928
929out:
930 mutex_unlock(&kvm->lock);
931 return r;
932}
933
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300934long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
935 unsigned long arg)
936{
937 void __user *argp = (void __user *)arg;
Jan Kiszka51de2712010-11-16 22:30:06 +0100938 int r;
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300939
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 }
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300956 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 }
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300978 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 }
Avi Kivitybfd99ff2009-08-26 14:57:50 +0300989#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
Jan Kiszka07700a92012-02-28 14:19:54 +01001011 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 }
Jan Kiszka51de2712010-11-16 22:30:06 +01001020 default:
1021 r = -ENOTTY;
1022 break;
Avi Kivitybfd99ff2009-08-26 14:57:50 +03001023 }
1024out:
1025 return r;
1026}