1 /*
2 * iommufd container backend
3 *
4 * Copyright (C) 2023 Intel Corporation.
5 * Copyright Red Hat, Inc. 2023
6 *
7 * Authors: Yi Liu <yi.l.liu@intel.com>
8 * Eric Auger <eric.auger@redhat.com>
9 *
10 * SPDX-License-Identifier: GPL-2.0-or-later
11 */
12
13 #include "qemu/osdep.h"
14 #include <sys/ioctl.h>
15 #include <linux/vfio.h>
16 #include <linux/iommufd.h>
17
18 #include "hw/vfio/vfio-common.h"
19 #include "qemu/error-report.h"
20 #include "trace.h"
21 #include "qapi/error.h"
22 #include "sysemu/iommufd.h"
23 #include "hw/qdev-core.h"
24 #include "sysemu/reset.h"
25 #include "qemu/cutils.h"
26 #include "qemu/chardev_open.h"
27 #include "pci.h"
28 #include "exec/ram_addr.h"
29
iommufd_cdev_map(const VFIOContainerBase * bcontainer,hwaddr iova,ram_addr_t size,void * vaddr,bool readonly)30 static int iommufd_cdev_map(const VFIOContainerBase *bcontainer, hwaddr iova,
31 ram_addr_t size, void *vaddr, bool readonly)
32 {
33 const VFIOIOMMUFDContainer *container =
34 container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
35
36 return iommufd_backend_map_dma(container->be,
37 container->ioas_id,
38 iova, size, vaddr, readonly);
39 }
40
iommufd_cdev_unmap(const VFIOContainerBase * bcontainer,hwaddr iova,ram_addr_t size,IOMMUTLBEntry * iotlb)41 static int iommufd_cdev_unmap(const VFIOContainerBase *bcontainer,
42 hwaddr iova, ram_addr_t size,
43 IOMMUTLBEntry *iotlb)
44 {
45 const VFIOIOMMUFDContainer *container =
46 container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
47
48 /* TODO: Handle dma_unmap_bitmap with iotlb args (migration) */
49 return iommufd_backend_unmap_dma(container->be,
50 container->ioas_id, iova, size);
51 }
52
iommufd_cdev_kvm_device_add(VFIODevice * vbasedev,Error ** errp)53 static bool iommufd_cdev_kvm_device_add(VFIODevice *vbasedev, Error **errp)
54 {
55 return !vfio_kvm_device_add_fd(vbasedev->fd, errp);
56 }
57
iommufd_cdev_kvm_device_del(VFIODevice * vbasedev)58 static void iommufd_cdev_kvm_device_del(VFIODevice *vbasedev)
59 {
60 Error *err = NULL;
61
62 if (vfio_kvm_device_del_fd(vbasedev->fd, &err)) {
63 error_report_err(err);
64 }
65 }
66
iommufd_cdev_connect_and_bind(VFIODevice * vbasedev,Error ** errp)67 static bool iommufd_cdev_connect_and_bind(VFIODevice *vbasedev, Error **errp)
68 {
69 IOMMUFDBackend *iommufd = vbasedev->iommufd;
70 struct vfio_device_bind_iommufd bind = {
71 .argsz = sizeof(bind),
72 .flags = 0,
73 };
74
75 if (!iommufd_backend_connect(iommufd, errp)) {
76 return false;
77 }
78
79 /*
80 * Add device to kvm-vfio to be prepared for the tracking
81 * in KVM. Especially for some emulated devices, it requires
82 * to have kvm information in the device open.
83 */
84 if (!iommufd_cdev_kvm_device_add(vbasedev, errp)) {
85 goto err_kvm_device_add;
86 }
87
88 /* Bind device to iommufd */
89 bind.iommufd = iommufd->fd;
90 if (ioctl(vbasedev->fd, VFIO_DEVICE_BIND_IOMMUFD, &bind)) {
91 error_setg_errno(errp, errno, "error bind device fd=%d to iommufd=%d",
92 vbasedev->fd, bind.iommufd);
93 goto err_bind;
94 }
95
96 vbasedev->devid = bind.out_devid;
97 trace_iommufd_cdev_connect_and_bind(bind.iommufd, vbasedev->name,
98 vbasedev->fd, vbasedev->devid);
99 return true;
100 err_bind:
101 iommufd_cdev_kvm_device_del(vbasedev);
102 err_kvm_device_add:
103 iommufd_backend_disconnect(iommufd);
104 return false;
105 }
106
iommufd_cdev_unbind_and_disconnect(VFIODevice * vbasedev)107 static void iommufd_cdev_unbind_and_disconnect(VFIODevice *vbasedev)
108 {
109 /* Unbind is automatically conducted when device fd is closed */
110 iommufd_cdev_kvm_device_del(vbasedev);
111 iommufd_backend_disconnect(vbasedev->iommufd);
112 }
113
iommufd_hwpt_dirty_tracking(VFIOIOASHwpt * hwpt)114 static bool iommufd_hwpt_dirty_tracking(VFIOIOASHwpt *hwpt)
115 {
116 return hwpt && hwpt->hwpt_flags & IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
117 }
118
iommufd_set_dirty_page_tracking(const VFIOContainerBase * bcontainer,bool start,Error ** errp)119 static int iommufd_set_dirty_page_tracking(const VFIOContainerBase *bcontainer,
120 bool start, Error **errp)
121 {
122 const VFIOIOMMUFDContainer *container =
123 container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
124 VFIOIOASHwpt *hwpt;
125
126 QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
127 if (!iommufd_hwpt_dirty_tracking(hwpt)) {
128 continue;
129 }
130
131 if (!iommufd_backend_set_dirty_tracking(container->be,
132 hwpt->hwpt_id, start, errp)) {
133 goto err;
134 }
135 }
136
137 return 0;
138
139 err:
140 QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
141 if (!iommufd_hwpt_dirty_tracking(hwpt)) {
142 continue;
143 }
144 iommufd_backend_set_dirty_tracking(container->be,
145 hwpt->hwpt_id, !start, NULL);
146 }
147 return -EINVAL;
148 }
149
iommufd_query_dirty_bitmap(const VFIOContainerBase * bcontainer,VFIOBitmap * vbmap,hwaddr iova,hwaddr size,Error ** errp)150 static int iommufd_query_dirty_bitmap(const VFIOContainerBase *bcontainer,
151 VFIOBitmap *vbmap, hwaddr iova,
152 hwaddr size, Error **errp)
153 {
154 VFIOIOMMUFDContainer *container = container_of(bcontainer,
155 VFIOIOMMUFDContainer,
156 bcontainer);
157 unsigned long page_size = qemu_real_host_page_size();
158 VFIOIOASHwpt *hwpt;
159
160 QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
161 if (!iommufd_hwpt_dirty_tracking(hwpt)) {
162 continue;
163 }
164
165 if (!iommufd_backend_get_dirty_bitmap(container->be, hwpt->hwpt_id,
166 iova, size, page_size,
167 (uint64_t *)vbmap->bitmap,
168 errp)) {
169 return -EINVAL;
170 }
171 }
172
173 return 0;
174 }
175
iommufd_cdev_getfd(const char * sysfs_path,Error ** errp)176 static int iommufd_cdev_getfd(const char *sysfs_path, Error **errp)
177 {
178 ERRP_GUARD();
179 long int ret = -ENOTTY;
180 g_autofree char *path = NULL;
181 g_autofree char *vfio_dev_path = NULL;
182 g_autofree char *vfio_path = NULL;
183 DIR *dir = NULL;
184 struct dirent *dent;
185 g_autofree gchar *contents = NULL;
186 gsize length;
187 int major, minor;
188 dev_t vfio_devt;
189
190 path = g_strdup_printf("%s/vfio-dev", sysfs_path);
191 dir = opendir(path);
192 if (!dir) {
193 error_setg_errno(errp, errno, "couldn't open directory %s", path);
194 goto out;
195 }
196
197 while ((dent = readdir(dir))) {
198 if (!strncmp(dent->d_name, "vfio", 4)) {
199 vfio_dev_path = g_strdup_printf("%s/%s/dev", path, dent->d_name);
200 break;
201 }
202 }
203
204 if (!vfio_dev_path) {
205 error_setg(errp, "failed to find vfio-dev/vfioX/dev");
206 goto out_close_dir;
207 }
208
209 if (!g_file_get_contents(vfio_dev_path, &contents, &length, NULL)) {
210 error_setg(errp, "failed to load \"%s\"", vfio_dev_path);
211 goto out_close_dir;
212 }
213
214 if (sscanf(contents, "%d:%d", &major, &minor) != 2) {
215 error_setg(errp, "failed to get major:minor for \"%s\"", vfio_dev_path);
216 goto out_close_dir;
217 }
218 vfio_devt = makedev(major, minor);
219
220 vfio_path = g_strdup_printf("/dev/vfio/devices/%s", dent->d_name);
221 ret = open_cdev(vfio_path, vfio_devt);
222 if (ret < 0) {
223 error_setg(errp, "Failed to open %s", vfio_path);
224 }
225
226 trace_iommufd_cdev_getfd(vfio_path, ret);
227
228 out_close_dir:
229 closedir(dir);
230 out:
231 if (*errp) {
232 error_prepend(errp, VFIO_MSG_PREFIX, path);
233 }
234
235 return ret;
236 }
237
iommufd_cdev_attach_ioas_hwpt(VFIODevice * vbasedev,uint32_t id,Error ** errp)238 static int iommufd_cdev_attach_ioas_hwpt(VFIODevice *vbasedev, uint32_t id,
239 Error **errp)
240 {
241 int iommufd = vbasedev->iommufd->fd;
242 struct vfio_device_attach_iommufd_pt attach_data = {
243 .argsz = sizeof(attach_data),
244 .flags = 0,
245 .pt_id = id,
246 };
247
248 /* Attach device to an IOAS or hwpt within iommufd */
249 if (ioctl(vbasedev->fd, VFIO_DEVICE_ATTACH_IOMMUFD_PT, &attach_data)) {
250 error_setg_errno(errp, errno,
251 "[iommufd=%d] error attach %s (%d) to id=%d",
252 iommufd, vbasedev->name, vbasedev->fd, id);
253 return -errno;
254 }
255
256 trace_iommufd_cdev_attach_ioas_hwpt(iommufd, vbasedev->name,
257 vbasedev->fd, id);
258 return 0;
259 }
260
iommufd_cdev_detach_ioas_hwpt(VFIODevice * vbasedev,Error ** errp)261 static bool iommufd_cdev_detach_ioas_hwpt(VFIODevice *vbasedev, Error **errp)
262 {
263 int iommufd = vbasedev->iommufd->fd;
264 struct vfio_device_detach_iommufd_pt detach_data = {
265 .argsz = sizeof(detach_data),
266 .flags = 0,
267 };
268
269 if (ioctl(vbasedev->fd, VFIO_DEVICE_DETACH_IOMMUFD_PT, &detach_data)) {
270 error_setg_errno(errp, errno, "detach %s failed", vbasedev->name);
271 return false;
272 }
273
274 trace_iommufd_cdev_detach_ioas_hwpt(iommufd, vbasedev->name);
275 return true;
276 }
277
iommufd_cdev_autodomains_get(VFIODevice * vbasedev,VFIOIOMMUFDContainer * container,Error ** errp)278 static bool iommufd_cdev_autodomains_get(VFIODevice *vbasedev,
279 VFIOIOMMUFDContainer *container,
280 Error **errp)
281 {
282 ERRP_GUARD();
283 IOMMUFDBackend *iommufd = vbasedev->iommufd;
284 uint32_t flags = 0;
285 VFIOIOASHwpt *hwpt;
286 uint32_t hwpt_id;
287 int ret;
288
289 /* Try to find a domain */
290 QLIST_FOREACH(hwpt, &container->hwpt_list, next) {
291 ret = iommufd_cdev_attach_ioas_hwpt(vbasedev, hwpt->hwpt_id, errp);
292 if (ret) {
293 /* -EINVAL means the domain is incompatible with the device. */
294 if (ret == -EINVAL) {
295 /*
296 * It is an expected failure and it just means we will try
297 * another domain, or create one if no existing compatible
298 * domain is found. Hence why the error is discarded below.
299 */
300 error_free(*errp);
301 *errp = NULL;
302 continue;
303 }
304
305 return false;
306 } else {
307 vbasedev->hwpt = hwpt;
308 QLIST_INSERT_HEAD(&hwpt->device_list, vbasedev, hwpt_next);
309 vbasedev->iommu_dirty_tracking = iommufd_hwpt_dirty_tracking(hwpt);
310 return true;
311 }
312 }
313
314 /*
315 * This is quite early and VFIO Migration state isn't yet fully
316 * initialized, thus rely only on IOMMU hardware capabilities as to
317 * whether IOMMU dirty tracking is going to be requested. Later
318 * vfio_migration_realize() may decide to use VF dirty tracking
319 * instead.
320 */
321 if (vbasedev->hiod->caps.hw_caps & IOMMU_HW_CAP_DIRTY_TRACKING) {
322 flags = IOMMU_HWPT_ALLOC_DIRTY_TRACKING;
323 }
324
325 if (!iommufd_backend_alloc_hwpt(iommufd, vbasedev->devid,
326 container->ioas_id, flags,
327 IOMMU_HWPT_DATA_NONE, 0, NULL,
328 &hwpt_id, errp)) {
329 return false;
330 }
331
332 hwpt = g_malloc0(sizeof(*hwpt));
333 hwpt->hwpt_id = hwpt_id;
334 hwpt->hwpt_flags = flags;
335 QLIST_INIT(&hwpt->device_list);
336
337 ret = iommufd_cdev_attach_ioas_hwpt(vbasedev, hwpt->hwpt_id, errp);
338 if (ret) {
339 iommufd_backend_free_id(container->be, hwpt->hwpt_id);
340 g_free(hwpt);
341 return false;
342 }
343
344 vbasedev->hwpt = hwpt;
345 vbasedev->iommu_dirty_tracking = iommufd_hwpt_dirty_tracking(hwpt);
346 QLIST_INSERT_HEAD(&hwpt->device_list, vbasedev, hwpt_next);
347 QLIST_INSERT_HEAD(&container->hwpt_list, hwpt, next);
348 container->bcontainer.dirty_pages_supported |=
349 vbasedev->iommu_dirty_tracking;
350 if (container->bcontainer.dirty_pages_supported &&
351 !vbasedev->iommu_dirty_tracking) {
352 warn_report("IOMMU instance for device %s doesn't support dirty tracking",
353 vbasedev->name);
354 }
355 return true;
356 }
357
iommufd_cdev_autodomains_put(VFIODevice * vbasedev,VFIOIOMMUFDContainer * container)358 static void iommufd_cdev_autodomains_put(VFIODevice *vbasedev,
359 VFIOIOMMUFDContainer *container)
360 {
361 VFIOIOASHwpt *hwpt = vbasedev->hwpt;
362
363 QLIST_REMOVE(vbasedev, hwpt_next);
364 vbasedev->hwpt = NULL;
365
366 if (QLIST_EMPTY(&hwpt->device_list)) {
367 QLIST_REMOVE(hwpt, next);
368 iommufd_backend_free_id(container->be, hwpt->hwpt_id);
369 g_free(hwpt);
370 }
371 }
372
iommufd_cdev_attach_container(VFIODevice * vbasedev,VFIOIOMMUFDContainer * container,Error ** errp)373 static bool iommufd_cdev_attach_container(VFIODevice *vbasedev,
374 VFIOIOMMUFDContainer *container,
375 Error **errp)
376 {
377 /* mdevs aren't physical devices and will fail with auto domains */
378 if (!vbasedev->mdev) {
379 return iommufd_cdev_autodomains_get(vbasedev, container, errp);
380 }
381
382 return !iommufd_cdev_attach_ioas_hwpt(vbasedev, container->ioas_id, errp);
383 }
384
iommufd_cdev_detach_container(VFIODevice * vbasedev,VFIOIOMMUFDContainer * container)385 static void iommufd_cdev_detach_container(VFIODevice *vbasedev,
386 VFIOIOMMUFDContainer *container)
387 {
388 Error *err = NULL;
389
390 if (!iommufd_cdev_detach_ioas_hwpt(vbasedev, &err)) {
391 error_report_err(err);
392 }
393
394 if (vbasedev->hwpt) {
395 iommufd_cdev_autodomains_put(vbasedev, container);
396 }
397
398 }
399
iommufd_cdev_container_destroy(VFIOIOMMUFDContainer * container)400 static void iommufd_cdev_container_destroy(VFIOIOMMUFDContainer *container)
401 {
402 VFIOContainerBase *bcontainer = &container->bcontainer;
403
404 if (!QLIST_EMPTY(&bcontainer->device_list)) {
405 return;
406 }
407 memory_listener_unregister(&bcontainer->listener);
408 iommufd_backend_free_id(container->be, container->ioas_id);
409 object_unref(container);
410 }
411
iommufd_cdev_ram_block_discard_disable(bool state)412 static int iommufd_cdev_ram_block_discard_disable(bool state)
413 {
414 /*
415 * We support coordinated discarding of RAM via the RamDiscardManager.
416 */
417 return ram_block_uncoordinated_discard_disable(state);
418 }
419
iommufd_cdev_get_info_iova_range(VFIOIOMMUFDContainer * container,uint32_t ioas_id,Error ** errp)420 static bool iommufd_cdev_get_info_iova_range(VFIOIOMMUFDContainer *container,
421 uint32_t ioas_id, Error **errp)
422 {
423 VFIOContainerBase *bcontainer = &container->bcontainer;
424 g_autofree struct iommu_ioas_iova_ranges *info = NULL;
425 struct iommu_iova_range *iova_ranges;
426 int sz, fd = container->be->fd;
427
428 info = g_malloc0(sizeof(*info));
429 info->size = sizeof(*info);
430 info->ioas_id = ioas_id;
431
432 if (ioctl(fd, IOMMU_IOAS_IOVA_RANGES, info) && errno != EMSGSIZE) {
433 goto error;
434 }
435
436 sz = info->num_iovas * sizeof(struct iommu_iova_range);
437 info = g_realloc(info, sizeof(*info) + sz);
438 info->allowed_iovas = (uintptr_t)(info + 1);
439
440 if (ioctl(fd, IOMMU_IOAS_IOVA_RANGES, info)) {
441 goto error;
442 }
443
444 iova_ranges = (struct iommu_iova_range *)(uintptr_t)info->allowed_iovas;
445
446 for (int i = 0; i < info->num_iovas; i++) {
447 Range *range = g_new(Range, 1);
448
449 range_set_bounds(range, iova_ranges[i].start, iova_ranges[i].last);
450 bcontainer->iova_ranges =
451 range_list_insert(bcontainer->iova_ranges, range);
452 }
453 bcontainer->pgsizes = info->out_iova_alignment;
454
455 return true;
456
457 error:
458 error_setg_errno(errp, errno, "Cannot get IOVA ranges");
459 return false;
460 }
461
iommufd_cdev_attach(const char * name,VFIODevice * vbasedev,AddressSpace * as,Error ** errp)462 static bool iommufd_cdev_attach(const char *name, VFIODevice *vbasedev,
463 AddressSpace *as, Error **errp)
464 {
465 VFIOContainerBase *bcontainer;
466 VFIOIOMMUFDContainer *container;
467 VFIOAddressSpace *space;
468 struct vfio_device_info dev_info = { .argsz = sizeof(dev_info) };
469 int ret, devfd;
470 uint32_t ioas_id;
471 Error *err = NULL;
472 const VFIOIOMMUClass *iommufd_vioc =
473 VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_IOMMUFD));
474
475 if (vbasedev->fd < 0) {
476 devfd = iommufd_cdev_getfd(vbasedev->sysfsdev, errp);
477 if (devfd < 0) {
478 return false;
479 }
480 vbasedev->fd = devfd;
481 } else {
482 devfd = vbasedev->fd;
483 }
484
485 if (!iommufd_cdev_connect_and_bind(vbasedev, errp)) {
486 goto err_connect_bind;
487 }
488
489 space = vfio_get_address_space(as);
490
491 /*
492 * The HostIOMMUDevice data from legacy backend is static and doesn't need
493 * any information from the (type1-iommu) backend to be initialized. In
494 * contrast however, the IOMMUFD HostIOMMUDevice data requires the iommufd
495 * FD to be connected and having a devid to be able to successfully call
496 * iommufd_backend_get_device_info().
497 */
498 if (!vfio_device_hiod_realize(vbasedev, errp)) {
499 goto err_alloc_ioas;
500 }
501
502 /* try to attach to an existing container in this space */
503 QLIST_FOREACH(bcontainer, &space->containers, next) {
504 container = container_of(bcontainer, VFIOIOMMUFDContainer, bcontainer);
505 if (VFIO_IOMMU_GET_CLASS(bcontainer) != iommufd_vioc ||
506 vbasedev->iommufd != container->be) {
507 continue;
508 }
509 if (!iommufd_cdev_attach_container(vbasedev, container, &err)) {
510 const char *msg = error_get_pretty(err);
511
512 trace_iommufd_cdev_fail_attach_existing_container(msg);
513 error_free(err);
514 err = NULL;
515 } else {
516 ret = iommufd_cdev_ram_block_discard_disable(true);
517 if (ret) {
518 error_setg(errp,
519 "Cannot set discarding of RAM broken (%d)", ret);
520 goto err_discard_disable;
521 }
522 goto found_container;
523 }
524 }
525
526 /* Need to allocate a new dedicated container */
527 if (!iommufd_backend_alloc_ioas(vbasedev->iommufd, &ioas_id, errp)) {
528 goto err_alloc_ioas;
529 }
530
531 trace_iommufd_cdev_alloc_ioas(vbasedev->iommufd->fd, ioas_id);
532
533 container = VFIO_IOMMU_IOMMUFD(object_new(TYPE_VFIO_IOMMU_IOMMUFD));
534 container->be = vbasedev->iommufd;
535 container->ioas_id = ioas_id;
536 QLIST_INIT(&container->hwpt_list);
537
538 bcontainer = &container->bcontainer;
539 vfio_address_space_insert(space, bcontainer);
540
541 if (!iommufd_cdev_attach_container(vbasedev, container, errp)) {
542 goto err_attach_container;
543 }
544
545 ret = iommufd_cdev_ram_block_discard_disable(true);
546 if (ret) {
547 goto err_discard_disable;
548 }
549
550 if (!iommufd_cdev_get_info_iova_range(container, ioas_id, &err)) {
551 error_append_hint(&err,
552 "Fallback to default 64bit IOVA range and 4K page size\n");
553 warn_report_err(err);
554 err = NULL;
555 bcontainer->pgsizes = qemu_real_host_page_size();
556 }
557
558 bcontainer->listener = vfio_memory_listener;
559 memory_listener_register(&bcontainer->listener, bcontainer->space->as);
560
561 if (bcontainer->error) {
562 error_propagate_prepend(errp, bcontainer->error,
563 "memory listener initialization failed: ");
564 goto err_listener_register;
565 }
566
567 bcontainer->initialized = true;
568
569 found_container:
570 ret = ioctl(devfd, VFIO_DEVICE_GET_INFO, &dev_info);
571 if (ret) {
572 error_setg_errno(errp, errno, "error getting device info");
573 goto err_listener_register;
574 }
575
576 if (!vfio_cpr_register_container(bcontainer, errp)) {
577 goto err_listener_register;
578 }
579
580 /*
581 * TODO: examine RAM_BLOCK_DISCARD stuff, should we do group level
582 * for discarding incompatibility check as well?
583 */
584 if (vbasedev->ram_block_discard_allowed) {
585 iommufd_cdev_ram_block_discard_disable(false);
586 }
587
588 vbasedev->group = 0;
589 vbasedev->num_irqs = dev_info.num_irqs;
590 vbasedev->num_regions = dev_info.num_regions;
591 vbasedev->flags = dev_info.flags;
592 vbasedev->reset_works = !!(dev_info.flags & VFIO_DEVICE_FLAGS_RESET);
593 vbasedev->bcontainer = bcontainer;
594 QLIST_INSERT_HEAD(&bcontainer->device_list, vbasedev, container_next);
595 QLIST_INSERT_HEAD(&vfio_device_list, vbasedev, global_next);
596
597 trace_iommufd_cdev_device_info(vbasedev->name, devfd, vbasedev->num_irqs,
598 vbasedev->num_regions, vbasedev->flags);
599 return true;
600
601 err_listener_register:
602 iommufd_cdev_ram_block_discard_disable(false);
603 err_discard_disable:
604 iommufd_cdev_detach_container(vbasedev, container);
605 err_attach_container:
606 iommufd_cdev_container_destroy(container);
607 err_alloc_ioas:
608 vfio_put_address_space(space);
609 iommufd_cdev_unbind_and_disconnect(vbasedev);
610 err_connect_bind:
611 close(vbasedev->fd);
612 return false;
613 }
614
iommufd_cdev_detach(VFIODevice * vbasedev)615 static void iommufd_cdev_detach(VFIODevice *vbasedev)
616 {
617 VFIOContainerBase *bcontainer = vbasedev->bcontainer;
618 VFIOAddressSpace *space = bcontainer->space;
619 VFIOIOMMUFDContainer *container = container_of(bcontainer,
620 VFIOIOMMUFDContainer,
621 bcontainer);
622 QLIST_REMOVE(vbasedev, global_next);
623 QLIST_REMOVE(vbasedev, container_next);
624 vbasedev->bcontainer = NULL;
625
626 if (!vbasedev->ram_block_discard_allowed) {
627 iommufd_cdev_ram_block_discard_disable(false);
628 }
629
630 vfio_cpr_unregister_container(bcontainer);
631 iommufd_cdev_detach_container(vbasedev, container);
632 iommufd_cdev_container_destroy(container);
633 vfio_put_address_space(space);
634
635 iommufd_cdev_unbind_and_disconnect(vbasedev);
636 close(vbasedev->fd);
637 }
638
iommufd_cdev_pci_find_by_devid(__u32 devid)639 static VFIODevice *iommufd_cdev_pci_find_by_devid(__u32 devid)
640 {
641 VFIODevice *vbasedev_iter;
642 const VFIOIOMMUClass *iommufd_vioc =
643 VFIO_IOMMU_CLASS(object_class_by_name(TYPE_VFIO_IOMMU_IOMMUFD));
644
645 QLIST_FOREACH(vbasedev_iter, &vfio_device_list, global_next) {
646 if (VFIO_IOMMU_GET_CLASS(vbasedev_iter->bcontainer) != iommufd_vioc) {
647 continue;
648 }
649 if (devid == vbasedev_iter->devid) {
650 return vbasedev_iter;
651 }
652 }
653 return NULL;
654 }
655
656 static VFIOPCIDevice *
iommufd_cdev_dep_get_realized_vpdev(struct vfio_pci_dependent_device * dep_dev,VFIODevice * reset_dev)657 iommufd_cdev_dep_get_realized_vpdev(struct vfio_pci_dependent_device *dep_dev,
658 VFIODevice *reset_dev)
659 {
660 VFIODevice *vbasedev_tmp;
661
662 if (dep_dev->devid == reset_dev->devid ||
663 dep_dev->devid == VFIO_PCI_DEVID_OWNED) {
664 return NULL;
665 }
666
667 vbasedev_tmp = iommufd_cdev_pci_find_by_devid(dep_dev->devid);
668 if (!vbasedev_tmp || !vbasedev_tmp->dev->realized ||
669 vbasedev_tmp->type != VFIO_DEVICE_TYPE_PCI) {
670 return NULL;
671 }
672
673 return container_of(vbasedev_tmp, VFIOPCIDevice, vbasedev);
674 }
675
iommufd_cdev_pci_hot_reset(VFIODevice * vbasedev,bool single)676 static int iommufd_cdev_pci_hot_reset(VFIODevice *vbasedev, bool single)
677 {
678 VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev);
679 struct vfio_pci_hot_reset_info *info = NULL;
680 struct vfio_pci_dependent_device *devices;
681 struct vfio_pci_hot_reset *reset;
682 int ret, i;
683 bool multi = false;
684
685 trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi");
686
687 if (!single) {
688 vfio_pci_pre_reset(vdev);
689 }
690 vdev->vbasedev.needs_reset = false;
691
692 ret = vfio_pci_get_pci_hot_reset_info(vdev, &info);
693
694 if (ret) {
695 goto out_single;
696 }
697
698 assert(info->flags & VFIO_PCI_HOT_RESET_FLAG_DEV_ID);
699
700 devices = &info->devices[0];
701
702 if (!(info->flags & VFIO_PCI_HOT_RESET_FLAG_DEV_ID_OWNED)) {
703 if (!vdev->has_pm_reset) {
704 for (i = 0; i < info->count; i++) {
705 if (devices[i].devid == VFIO_PCI_DEVID_NOT_OWNED) {
706 error_report("vfio: Cannot reset device %s, "
707 "depends on device %04x:%02x:%02x.%x "
708 "which is not owned.",
709 vdev->vbasedev.name, devices[i].segment,
710 devices[i].bus, PCI_SLOT(devices[i].devfn),
711 PCI_FUNC(devices[i].devfn));
712 }
713 }
714 }
715 ret = -EPERM;
716 goto out_single;
717 }
718
719 trace_vfio_pci_hot_reset_has_dep_devices(vdev->vbasedev.name);
720
721 for (i = 0; i < info->count; i++) {
722 VFIOPCIDevice *tmp;
723
724 trace_iommufd_cdev_pci_hot_reset_dep_devices(devices[i].segment,
725 devices[i].bus,
726 PCI_SLOT(devices[i].devfn),
727 PCI_FUNC(devices[i].devfn),
728 devices[i].devid);
729
730 /*
731 * If a VFIO cdev device is resettable, all the dependent devices
732 * are either bound to same iommufd or within same iommu_groups as
733 * one of the iommufd bound devices.
734 */
735 assert(devices[i].devid != VFIO_PCI_DEVID_NOT_OWNED);
736
737 tmp = iommufd_cdev_dep_get_realized_vpdev(&devices[i], &vdev->vbasedev);
738 if (!tmp) {
739 continue;
740 }
741
742 if (single) {
743 ret = -EINVAL;
744 goto out_single;
745 }
746 vfio_pci_pre_reset(tmp);
747 tmp->vbasedev.needs_reset = false;
748 multi = true;
749 }
750
751 if (!single && !multi) {
752 ret = -EINVAL;
753 goto out_single;
754 }
755
756 /* Use zero length array for hot reset with iommufd backend */
757 reset = g_malloc0(sizeof(*reset));
758 reset->argsz = sizeof(*reset);
759
760 /* Bus reset! */
761 ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset);
762 g_free(reset);
763 if (ret) {
764 ret = -errno;
765 }
766
767 trace_vfio_pci_hot_reset_result(vdev->vbasedev.name,
768 ret ? strerror(errno) : "Success");
769
770 /* Re-enable INTx on affected devices */
771 for (i = 0; i < info->count; i++) {
772 VFIOPCIDevice *tmp;
773
774 tmp = iommufd_cdev_dep_get_realized_vpdev(&devices[i], &vdev->vbasedev);
775 if (!tmp) {
776 continue;
777 }
778 vfio_pci_post_reset(tmp);
779 }
780 out_single:
781 if (!single) {
782 vfio_pci_post_reset(vdev);
783 }
784 g_free(info);
785
786 return ret;
787 }
788
vfio_iommu_iommufd_class_init(ObjectClass * klass,void * data)789 static void vfio_iommu_iommufd_class_init(ObjectClass *klass, void *data)
790 {
791 VFIOIOMMUClass *vioc = VFIO_IOMMU_CLASS(klass);
792
793 vioc->hiod_typename = TYPE_HOST_IOMMU_DEVICE_IOMMUFD_VFIO;
794
795 vioc->dma_map = iommufd_cdev_map;
796 vioc->dma_unmap = iommufd_cdev_unmap;
797 vioc->attach_device = iommufd_cdev_attach;
798 vioc->detach_device = iommufd_cdev_detach;
799 vioc->pci_hot_reset = iommufd_cdev_pci_hot_reset;
800 vioc->set_dirty_page_tracking = iommufd_set_dirty_page_tracking;
801 vioc->query_dirty_bitmap = iommufd_query_dirty_bitmap;
802 };
803
hiod_iommufd_vfio_realize(HostIOMMUDevice * hiod,void * opaque,Error ** errp)804 static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
805 Error **errp)
806 {
807 VFIODevice *vdev = opaque;
808 HostIOMMUDeviceCaps *caps = &hiod->caps;
809 enum iommu_hw_info_type type;
810 union {
811 struct iommu_hw_info_vtd vtd;
812 } data;
813 uint64_t hw_caps;
814
815 hiod->agent = opaque;
816
817 if (!iommufd_backend_get_device_info(vdev->iommufd, vdev->devid,
818 &type, &data, sizeof(data),
819 &hw_caps, errp)) {
820 return false;
821 }
822
823 hiod->name = g_strdup(vdev->name);
824 caps->type = type;
825 caps->hw_caps = hw_caps;
826
827 return true;
828 }
829
830 static GList *
hiod_iommufd_vfio_get_iova_ranges(HostIOMMUDevice * hiod)831 hiod_iommufd_vfio_get_iova_ranges(HostIOMMUDevice *hiod)
832 {
833 VFIODevice *vdev = hiod->agent;
834
835 g_assert(vdev);
836 return vfio_container_get_iova_ranges(vdev->bcontainer);
837 }
838
839 static uint64_t
hiod_iommufd_vfio_get_page_size_mask(HostIOMMUDevice * hiod)840 hiod_iommufd_vfio_get_page_size_mask(HostIOMMUDevice *hiod)
841 {
842 VFIODevice *vdev = hiod->agent;
843
844 g_assert(vdev);
845 return vfio_container_get_page_size_mask(vdev->bcontainer);
846 }
847
848
hiod_iommufd_vfio_class_init(ObjectClass * oc,void * data)849 static void hiod_iommufd_vfio_class_init(ObjectClass *oc, void *data)
850 {
851 HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc);
852
853 hiodc->realize = hiod_iommufd_vfio_realize;
854 hiodc->get_iova_ranges = hiod_iommufd_vfio_get_iova_ranges;
855 hiodc->get_page_size_mask = hiod_iommufd_vfio_get_page_size_mask;
856 };
857
858 static const TypeInfo types[] = {
859 {
860 .name = TYPE_VFIO_IOMMU_IOMMUFD,
861 .parent = TYPE_VFIO_IOMMU,
862 .instance_size = sizeof(VFIOIOMMUFDContainer),
863 .class_init = vfio_iommu_iommufd_class_init,
864 }, {
865 .name = TYPE_HOST_IOMMU_DEVICE_IOMMUFD_VFIO,
866 .parent = TYPE_HOST_IOMMU_DEVICE_IOMMUFD,
867 .class_init = hiod_iommufd_vfio_class_init,
868 }
869 };
870
871 DEFINE_TYPES(types)
872