1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 NetApp, Inc.
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <sys/param.h>
35 #include <sys/systm.h>
36 #include <sys/kernel.h>
37 #include <sys/malloc.h>
38 #include <sys/module.h>
39 #include <sys/bus.h>
40 #include <sys/pciio.h>
41 #include <sys/rman.h>
42 #include <sys/smp.h>
43 #include <sys/sysctl.h>
44
45 #include <dev/pci/pcivar.h>
46 #include <dev/pci/pcireg.h>
47
48 #include <machine/resource.h>
49
50 #include <machine/vmm.h>
51 #include <machine/vmm_dev.h>
52
53 #include "vmm_lapic.h"
54 #include "vmm_ktr.h"
55
56 #include "iommu.h"
57 #include "ppt.h"
58
59 /* XXX locking */
60
61 #define MAX_MSIMSGS 32
62
63 /*
64 * If the MSI-X table is located in the middle of a BAR then that MMIO
65 * region gets split into two segments - one segment above the MSI-X table
66 * and the other segment below the MSI-X table - with a hole in place of
67 * the MSI-X table so accesses to it can be trapped and emulated.
68 *
69 * So, allocate a MMIO segment for each BAR register + 1 additional segment.
70 */
71 #define MAX_MMIOSEGS ((PCIR_MAX_BAR_0 + 1) + 1)
72
73 MALLOC_DEFINE(M_PPTMSIX, "pptmsix", "Passthru MSI-X resources");
74
75 struct pptintr_arg { /* pptintr(pptintr_arg) */
76 struct pptdev *pptdev;
77 uint64_t addr;
78 uint64_t msg_data;
79 };
80
81 struct pptseg {
82 vm_paddr_t gpa;
83 size_t len;
84 int wired;
85 };
86
87 struct pptdev {
88 device_t dev;
89 struct vm *vm; /* owner of this device */
90 TAILQ_ENTRY(pptdev) next;
91 struct pptseg mmio[MAX_MMIOSEGS];
92 struct {
93 int num_msgs; /* guest state */
94
95 int startrid; /* host state */
96 struct resource *res[MAX_MSIMSGS];
97 void *cookie[MAX_MSIMSGS];
98 struct pptintr_arg arg[MAX_MSIMSGS];
99 } msi;
100
101 struct {
102 int num_msgs;
103 int startrid;
104 int msix_table_rid;
105 int msix_pba_rid;
106 struct resource *msix_table_res;
107 struct resource *msix_pba_res;
108 struct resource **res;
109 void **cookie;
110 struct pptintr_arg *arg;
111 } msix;
112 };
113
114 SYSCTL_DECL(_hw_vmm);
115 SYSCTL_NODE(_hw_vmm, OID_AUTO, ppt, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
116 "bhyve passthru devices");
117
118 static int num_pptdevs;
119 SYSCTL_INT(_hw_vmm_ppt, OID_AUTO, devices, CTLFLAG_RD, &num_pptdevs, 0,
120 "number of pci passthru devices");
121
122 static TAILQ_HEAD(, pptdev) pptdev_list = TAILQ_HEAD_INITIALIZER(pptdev_list);
123
124 static int
ppt_probe(device_t dev)125 ppt_probe(device_t dev)
126 {
127 int bus, slot, func;
128 struct pci_devinfo *dinfo;
129
130 dinfo = (struct pci_devinfo *)device_get_ivars(dev);
131
132 bus = pci_get_bus(dev);
133 slot = pci_get_slot(dev);
134 func = pci_get_function(dev);
135
136 /*
137 * To qualify as a pci passthrough device a device must:
138 * - be allowed by administrator to be used in this role
139 * - be an endpoint device
140 */
141 if ((dinfo->cfg.hdrtype & PCIM_HDRTYPE) != PCIM_HDRTYPE_NORMAL)
142 return (ENXIO);
143 else if (vmm_is_pptdev(bus, slot, func))
144 return (0);
145 else
146 /*
147 * Returning BUS_PROBE_NOWILDCARD here matches devices that the
148 * SR-IOV infrastructure specified as "ppt" passthrough devices.
149 * All normal devices that did not have "ppt" specified as their
150 * driver will not be matched by this.
151 */
152 return (BUS_PROBE_NOWILDCARD);
153 }
154
155 static int
ppt_attach(device_t dev)156 ppt_attach(device_t dev)
157 {
158 struct pptdev *ppt;
159
160 ppt = device_get_softc(dev);
161
162 iommu_remove_device(iommu_host_domain(), pci_get_rid(dev));
163 num_pptdevs++;
164 TAILQ_INSERT_TAIL(&pptdev_list, ppt, next);
165 ppt->dev = dev;
166
167 if (bootverbose)
168 device_printf(dev, "attached\n");
169
170 return (0);
171 }
172
173 static int
ppt_detach(device_t dev)174 ppt_detach(device_t dev)
175 {
176 struct pptdev *ppt;
177
178 ppt = device_get_softc(dev);
179
180 if (ppt->vm != NULL)
181 return (EBUSY);
182 num_pptdevs--;
183 TAILQ_REMOVE(&pptdev_list, ppt, next);
184 pci_disable_busmaster(dev);
185 iommu_add_device(iommu_host_domain(), pci_get_rid(dev));
186
187 return (0);
188 }
189
190 static device_method_t ppt_methods[] = {
191 /* Device interface */
192 DEVMETHOD(device_probe, ppt_probe),
193 DEVMETHOD(device_attach, ppt_attach),
194 DEVMETHOD(device_detach, ppt_detach),
195 {0, 0}
196 };
197
198 static devclass_t ppt_devclass;
199 DEFINE_CLASS_0(ppt, ppt_driver, ppt_methods, sizeof(struct pptdev));
200 DRIVER_MODULE(ppt, pci, ppt_driver, ppt_devclass, NULL, NULL);
201
202 static int
ppt_find(struct vm * vm,int bus,int slot,int func,struct pptdev ** pptp)203 ppt_find(struct vm *vm, int bus, int slot, int func, struct pptdev **pptp)
204 {
205 device_t dev;
206 struct pptdev *ppt;
207 int b, s, f;
208
209 TAILQ_FOREACH(ppt, &pptdev_list, next) {
210 dev = ppt->dev;
211 b = pci_get_bus(dev);
212 s = pci_get_slot(dev);
213 f = pci_get_function(dev);
214 if (bus == b && slot == s && func == f)
215 break;
216 }
217
218 if (ppt == NULL)
219 return (ENOENT);
220 if (ppt->vm != vm) /* Make sure we own this device */
221 return (EBUSY);
222 *pptp = ppt;
223 return (0);
224 }
225
226 static void
ppt_unmap_mmio(struct vm * vm,struct pptdev * ppt)227 ppt_unmap_mmio(struct vm *vm, struct pptdev *ppt)
228 {
229 int i;
230 struct pptseg *seg;
231
232 for (i = 0; i < MAX_MMIOSEGS; i++) {
233 seg = &ppt->mmio[i];
234 if (seg->len == 0)
235 continue;
236 (void)vm_unmap_mmio(vm, seg->gpa, seg->len);
237 bzero(seg, sizeof(struct pptseg));
238 }
239 }
240
241 static void
ppt_teardown_msi(struct pptdev * ppt)242 ppt_teardown_msi(struct pptdev *ppt)
243 {
244 int i, rid;
245 void *cookie;
246 struct resource *res;
247
248 if (ppt->msi.num_msgs == 0)
249 return;
250
251 for (i = 0; i < ppt->msi.num_msgs; i++) {
252 rid = ppt->msi.startrid + i;
253 res = ppt->msi.res[i];
254 cookie = ppt->msi.cookie[i];
255
256 if (cookie != NULL)
257 bus_teardown_intr(ppt->dev, res, cookie);
258
259 if (res != NULL)
260 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, res);
261
262 ppt->msi.res[i] = NULL;
263 ppt->msi.cookie[i] = NULL;
264 }
265
266 if (ppt->msi.startrid == 1)
267 pci_release_msi(ppt->dev);
268
269 ppt->msi.num_msgs = 0;
270 }
271
272 static void
ppt_teardown_msix_intr(struct pptdev * ppt,int idx)273 ppt_teardown_msix_intr(struct pptdev *ppt, int idx)
274 {
275 int rid;
276 struct resource *res;
277 void *cookie;
278
279 rid = ppt->msix.startrid + idx;
280 res = ppt->msix.res[idx];
281 cookie = ppt->msix.cookie[idx];
282
283 if (cookie != NULL)
284 bus_teardown_intr(ppt->dev, res, cookie);
285
286 if (res != NULL)
287 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, res);
288
289 ppt->msix.res[idx] = NULL;
290 ppt->msix.cookie[idx] = NULL;
291 }
292
293 static void
ppt_teardown_msix(struct pptdev * ppt)294 ppt_teardown_msix(struct pptdev *ppt)
295 {
296 int i;
297
298 if (ppt->msix.num_msgs == 0)
299 return;
300
301 for (i = 0; i < ppt->msix.num_msgs; i++)
302 ppt_teardown_msix_intr(ppt, i);
303
304 free(ppt->msix.res, M_PPTMSIX);
305 free(ppt->msix.cookie, M_PPTMSIX);
306 free(ppt->msix.arg, M_PPTMSIX);
307
308 pci_release_msi(ppt->dev);
309
310 if (ppt->msix.msix_table_res) {
311 bus_release_resource(ppt->dev, SYS_RES_MEMORY,
312 ppt->msix.msix_table_rid,
313 ppt->msix.msix_table_res);
314 ppt->msix.msix_table_res = NULL;
315 ppt->msix.msix_table_rid = 0;
316 }
317 if (ppt->msix.msix_pba_res) {
318 bus_release_resource(ppt->dev, SYS_RES_MEMORY,
319 ppt->msix.msix_pba_rid,
320 ppt->msix.msix_pba_res);
321 ppt->msix.msix_pba_res = NULL;
322 ppt->msix.msix_pba_rid = 0;
323 }
324
325 ppt->msix.num_msgs = 0;
326 }
327
328 int
ppt_avail_devices(void)329 ppt_avail_devices(void)
330 {
331
332 return (num_pptdevs);
333 }
334
335 int
ppt_assigned_devices(struct vm * vm)336 ppt_assigned_devices(struct vm *vm)
337 {
338 struct pptdev *ppt;
339 int num;
340
341 num = 0;
342 TAILQ_FOREACH(ppt, &pptdev_list, next) {
343 if (ppt->vm == vm)
344 num++;
345 }
346 return (num);
347 }
348
349 bool
ppt_is_mmio(struct vm * vm,vm_paddr_t gpa)350 ppt_is_mmio(struct vm *vm, vm_paddr_t gpa)
351 {
352 int i;
353 struct pptdev *ppt;
354 struct pptseg *seg;
355
356 TAILQ_FOREACH(ppt, &pptdev_list, next) {
357 if (ppt->vm != vm)
358 continue;
359
360 for (i = 0; i < MAX_MMIOSEGS; i++) {
361 seg = &ppt->mmio[i];
362 if (seg->len == 0)
363 continue;
364 if (gpa >= seg->gpa && gpa < seg->gpa + seg->len)
365 return (true);
366 }
367 }
368
369 return (false);
370 }
371
372 static void
ppt_pci_reset(device_t dev)373 ppt_pci_reset(device_t dev)
374 {
375
376 if (pcie_flr(dev,
377 max(pcie_get_max_completion_timeout(dev) / 1000, 10), true))
378 return;
379
380 pci_power_reset(dev);
381 }
382
383 int
ppt_assign_device(struct vm * vm,int bus,int slot,int func)384 ppt_assign_device(struct vm *vm, int bus, int slot, int func)
385 {
386 struct pptdev *ppt;
387 int error;
388
389 /* Passing NULL requires the device to be unowned. */
390 error = ppt_find(NULL, bus, slot, func, &ppt);
391 if (error)
392 return (error);
393
394 pci_save_state(ppt->dev);
395 ppt_pci_reset(ppt->dev);
396 pci_restore_state(ppt->dev);
397 ppt->vm = vm;
398 iommu_add_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev));
399 return (0);
400 }
401
402 int
ppt_unassign_device(struct vm * vm,int bus,int slot,int func)403 ppt_unassign_device(struct vm *vm, int bus, int slot, int func)
404 {
405 struct pptdev *ppt;
406 int error;
407
408 error = ppt_find(vm, bus, slot, func, &ppt);
409 if (error)
410 return (error);
411
412 pci_save_state(ppt->dev);
413 ppt_pci_reset(ppt->dev);
414 pci_restore_state(ppt->dev);
415 ppt_unmap_mmio(vm, ppt);
416 ppt_teardown_msi(ppt);
417 ppt_teardown_msix(ppt);
418 iommu_remove_device(vm_iommu_domain(vm), pci_get_rid(ppt->dev));
419 ppt->vm = NULL;
420 return (0);
421 }
422
423 int
ppt_unassign_all(struct vm * vm)424 ppt_unassign_all(struct vm *vm)
425 {
426 struct pptdev *ppt;
427 int bus, slot, func;
428 device_t dev;
429
430 TAILQ_FOREACH(ppt, &pptdev_list, next) {
431 if (ppt->vm == vm) {
432 dev = ppt->dev;
433 bus = pci_get_bus(dev);
434 slot = pci_get_slot(dev);
435 func = pci_get_function(dev);
436 vm_unassign_pptdev(vm, bus, slot, func);
437 }
438 }
439
440 return (0);
441 }
442
443 int
ppt_map_mmio(struct vm * vm,int bus,int slot,int func,vm_paddr_t gpa,size_t len,vm_paddr_t hpa)444 ppt_map_mmio(struct vm *vm, int bus, int slot, int func,
445 vm_paddr_t gpa, size_t len, vm_paddr_t hpa)
446 {
447 int i, error;
448 struct pptseg *seg;
449 struct pptdev *ppt;
450
451 error = ppt_find(vm, bus, slot, func, &ppt);
452 if (error)
453 return (error);
454
455 for (i = 0; i < MAX_MMIOSEGS; i++) {
456 seg = &ppt->mmio[i];
457 if (seg->len == 0) {
458 error = vm_map_mmio(vm, gpa, len, hpa);
459 if (error == 0) {
460 seg->gpa = gpa;
461 seg->len = len;
462 }
463 return (error);
464 }
465 }
466 return (ENOSPC);
467 }
468
469 static int
pptintr(void * arg)470 pptintr(void *arg)
471 {
472 struct pptdev *ppt;
473 struct pptintr_arg *pptarg;
474
475 pptarg = arg;
476 ppt = pptarg->pptdev;
477
478 if (ppt->vm != NULL)
479 lapic_intr_msi(ppt->vm, pptarg->addr, pptarg->msg_data);
480 else {
481 /*
482 * XXX
483 * This is not expected to happen - panic?
484 */
485 }
486
487 /*
488 * For legacy interrupts give other filters a chance in case
489 * the interrupt was not generated by the passthrough device.
490 */
491 if (ppt->msi.startrid == 0)
492 return (FILTER_STRAY);
493 else
494 return (FILTER_HANDLED);
495 }
496
497 int
ppt_setup_msi(struct vm * vm,int vcpu,int bus,int slot,int func,uint64_t addr,uint64_t msg,int numvec)498 ppt_setup_msi(struct vm *vm, int vcpu, int bus, int slot, int func,
499 uint64_t addr, uint64_t msg, int numvec)
500 {
501 int i, rid, flags;
502 int msi_count, startrid, error, tmp;
503 struct pptdev *ppt;
504
505 if (numvec < 0 || numvec > MAX_MSIMSGS)
506 return (EINVAL);
507
508 error = ppt_find(vm, bus, slot, func, &ppt);
509 if (error)
510 return (error);
511
512 /* Reject attempts to enable MSI while MSI-X is active. */
513 if (ppt->msix.num_msgs != 0 && numvec != 0)
514 return (EBUSY);
515
516 /* Free any allocated resources */
517 ppt_teardown_msi(ppt);
518
519 if (numvec == 0) /* nothing more to do */
520 return (0);
521
522 flags = RF_ACTIVE;
523 msi_count = pci_msi_count(ppt->dev);
524 if (msi_count == 0) {
525 startrid = 0; /* legacy interrupt */
526 msi_count = 1;
527 flags |= RF_SHAREABLE;
528 } else
529 startrid = 1; /* MSI */
530
531 /*
532 * The device must be capable of supporting the number of vectors
533 * the guest wants to allocate.
534 */
535 if (numvec > msi_count)
536 return (EINVAL);
537
538 /*
539 * Make sure that we can allocate all the MSI vectors that are needed
540 * by the guest.
541 */
542 if (startrid == 1) {
543 tmp = numvec;
544 error = pci_alloc_msi(ppt->dev, &tmp);
545 if (error)
546 return (error);
547 else if (tmp != numvec) {
548 pci_release_msi(ppt->dev);
549 return (ENOSPC);
550 } else {
551 /* success */
552 }
553 }
554
555 ppt->msi.startrid = startrid;
556
557 /*
558 * Allocate the irq resource and attach it to the interrupt handler.
559 */
560 for (i = 0; i < numvec; i++) {
561 ppt->msi.num_msgs = i + 1;
562 ppt->msi.cookie[i] = NULL;
563
564 rid = startrid + i;
565 ppt->msi.res[i] = bus_alloc_resource_any(ppt->dev, SYS_RES_IRQ,
566 &rid, flags);
567 if (ppt->msi.res[i] == NULL)
568 break;
569
570 ppt->msi.arg[i].pptdev = ppt;
571 ppt->msi.arg[i].addr = addr;
572 ppt->msi.arg[i].msg_data = msg + i;
573
574 error = bus_setup_intr(ppt->dev, ppt->msi.res[i],
575 INTR_TYPE_NET | INTR_MPSAFE,
576 pptintr, NULL, &ppt->msi.arg[i],
577 &ppt->msi.cookie[i]);
578 if (error != 0)
579 break;
580 }
581
582 if (i < numvec) {
583 ppt_teardown_msi(ppt);
584 return (ENXIO);
585 }
586
587 return (0);
588 }
589
590 int
ppt_setup_msix(struct vm * vm,int vcpu,int bus,int slot,int func,int idx,uint64_t addr,uint64_t msg,uint32_t vector_control)591 ppt_setup_msix(struct vm *vm, int vcpu, int bus, int slot, int func,
592 int idx, uint64_t addr, uint64_t msg, uint32_t vector_control)
593 {
594 struct pptdev *ppt;
595 struct pci_devinfo *dinfo;
596 int numvec, alloced, rid, error;
597 size_t res_size, cookie_size, arg_size;
598
599 error = ppt_find(vm, bus, slot, func, &ppt);
600 if (error)
601 return (error);
602
603 /* Reject attempts to enable MSI-X while MSI is active. */
604 if (ppt->msi.num_msgs != 0)
605 return (EBUSY);
606
607 dinfo = device_get_ivars(ppt->dev);
608 if (!dinfo)
609 return (ENXIO);
610
611 /*
612 * First-time configuration:
613 * Allocate the MSI-X table
614 * Allocate the IRQ resources
615 * Set up some variables in ppt->msix
616 */
617 if (ppt->msix.num_msgs == 0) {
618 numvec = pci_msix_count(ppt->dev);
619 if (numvec <= 0)
620 return (EINVAL);
621
622 ppt->msix.startrid = 1;
623 ppt->msix.num_msgs = numvec;
624
625 res_size = numvec * sizeof(ppt->msix.res[0]);
626 cookie_size = numvec * sizeof(ppt->msix.cookie[0]);
627 arg_size = numvec * sizeof(ppt->msix.arg[0]);
628
629 ppt->msix.res = malloc(res_size, M_PPTMSIX, M_WAITOK | M_ZERO);
630 ppt->msix.cookie = malloc(cookie_size, M_PPTMSIX,
631 M_WAITOK | M_ZERO);
632 ppt->msix.arg = malloc(arg_size, M_PPTMSIX, M_WAITOK | M_ZERO);
633
634 rid = dinfo->cfg.msix.msix_table_bar;
635 ppt->msix.msix_table_res = bus_alloc_resource_any(ppt->dev,
636 SYS_RES_MEMORY, &rid, RF_ACTIVE);
637
638 if (ppt->msix.msix_table_res == NULL) {
639 ppt_teardown_msix(ppt);
640 return (ENOSPC);
641 }
642 ppt->msix.msix_table_rid = rid;
643
644 if (dinfo->cfg.msix.msix_table_bar !=
645 dinfo->cfg.msix.msix_pba_bar) {
646 rid = dinfo->cfg.msix.msix_pba_bar;
647 ppt->msix.msix_pba_res = bus_alloc_resource_any(
648 ppt->dev, SYS_RES_MEMORY, &rid, RF_ACTIVE);
649
650 if (ppt->msix.msix_pba_res == NULL) {
651 ppt_teardown_msix(ppt);
652 return (ENOSPC);
653 }
654 ppt->msix.msix_pba_rid = rid;
655 }
656
657 alloced = numvec;
658 error = pci_alloc_msix(ppt->dev, &alloced);
659 if (error || alloced != numvec) {
660 ppt_teardown_msix(ppt);
661 return (error == 0 ? ENOSPC: error);
662 }
663 }
664
665 if ((vector_control & PCIM_MSIX_VCTRL_MASK) == 0) {
666 /* Tear down the IRQ if it's already set up */
667 ppt_teardown_msix_intr(ppt, idx);
668
669 /* Allocate the IRQ resource */
670 ppt->msix.cookie[idx] = NULL;
671 rid = ppt->msix.startrid + idx;
672 ppt->msix.res[idx] = bus_alloc_resource_any(ppt->dev, SYS_RES_IRQ,
673 &rid, RF_ACTIVE);
674 if (ppt->msix.res[idx] == NULL)
675 return (ENXIO);
676
677 ppt->msix.arg[idx].pptdev = ppt;
678 ppt->msix.arg[idx].addr = addr;
679 ppt->msix.arg[idx].msg_data = msg;
680
681 /* Setup the MSI-X interrupt */
682 error = bus_setup_intr(ppt->dev, ppt->msix.res[idx],
683 INTR_TYPE_NET | INTR_MPSAFE,
684 pptintr, NULL, &ppt->msix.arg[idx],
685 &ppt->msix.cookie[idx]);
686
687 if (error != 0) {
688 bus_release_resource(ppt->dev, SYS_RES_IRQ, rid, ppt->msix.res[idx]);
689 ppt->msix.cookie[idx] = NULL;
690 ppt->msix.res[idx] = NULL;
691 return (ENXIO);
692 }
693 } else {
694 /* Masked, tear it down if it's already been set up */
695 ppt_teardown_msix_intr(ppt, idx);
696 }
697
698 return (0);
699 }
700
701 int
ppt_disable_msix(struct vm * vm,int bus,int slot,int func)702 ppt_disable_msix(struct vm *vm, int bus, int slot, int func)
703 {
704 struct pptdev *ppt;
705 int error;
706
707 error = ppt_find(vm, bus, slot, func, &ppt);
708 if (error)
709 return (error);
710
711 ppt_teardown_msix(ppt);
712 return (0);
713 }
714