| 1 | /* |
| 2 | * generic functions used by VFIO devices |
| 3 | * |
| 4 | * Copyright Red Hat, Inc. 2012 |
| 5 | * |
| 6 | * Authors: |
| 7 | * Alex Williamson <alex.williamson@redhat.com> |
| 8 | * |
| 9 | * This work is licensed under the terms of the GNU GPL, version 2. See |
| 10 | * the COPYING file in the top-level directory. |
| 11 | * |
| 12 | * Based on qemu-kvm device-assignment: |
| 13 | * Adapted for KVM by Qumranet. |
| 14 | * Copyright (c) 2007, Neocleus, Alex Novik (alex@neocleus.com) |
| 15 | * Copyright (c) 2007, Neocleus, Guy Zana (guy@neocleus.com) |
| 16 | * Copyright (C) 2008, Qumranet, Amit Shah (amit.shah@qumranet.com) |
| 17 | * Copyright (C) 2008, Red Hat, Amit Shah (amit.shah@redhat.com) |
| 18 | * Copyright (C) 2008, IBM, Muli Ben-Yehuda (muli@il.ibm.com) |
| 19 | */ |
| 20 | |
| 21 | #include "qemu/osdep.h" |
| 22 | #include <sys/ioctl.h> |
| 23 | #include <linux/vfio.h> |
| 24 | |
| 25 | #include "hw/vfio/vfio-device.h" |
| 26 | #include "system/address-spaces.h" |
| 27 | #include "system/memory.h" |
| 28 | #include "system/physmem.h" |
| 29 | #include "qemu/error-report.h" |
| 30 | #include "qemu/range.h" |
| 31 | #include "system/reset.h" |
| 32 | #include "trace.h" |
| 33 | #include "qapi/error.h" |
| 34 | #include "migration/cpr.h" |
| 35 | #include "migration/blocker.h" |
| 36 | #include "pci.h" |
| 37 | #include "hw/vfio/vfio-container-legacy.h" |
| 38 | #include "vfio-helpers.h" |
| 39 | #include "vfio-listener.h" |
| 40 | |
| 41 | #define TYPE_HOST_IOMMU_DEVICE_LEGACY_VFIO TYPE_HOST_IOMMU_DEVICE "-legacy-vfio" |
| 42 | |
| 43 | typedef QLIST_HEAD(VFIOGroupList, VFIOGroup) VFIOGroupList; |
| 44 | static VFIOGroupList vfio_group_list = |
| 45 | QLIST_HEAD_INITIALIZER(vfio_group_list); |
| 46 | |
| 47 | static int vfio_ram_block_discard_disable(VFIOLegacyContainer *container, |
| 48 | bool state) |
| 49 | { |
| 50 | switch (container->iommu_type) { |
| 51 | case VFIO_TYPE1v2_IOMMU: |
| 52 | case VFIO_TYPE1_IOMMU: |
| 53 | /* |
| 54 | * We support coordinated discarding of RAM via the RamDiscardManager. |
| 55 | */ |
| 56 | return ram_block_uncoordinated_discard_disable(state); |
| 57 | default: |
| 58 | /* |
| 59 | * VFIO_SPAPR_TCE_IOMMU most probably works just fine with |
| 60 | * RamDiscardManager, however, it is completely untested. |
| 61 | * |
| 62 | * VFIO_SPAPR_TCE_v2_IOMMU with "DMA memory preregistering" does |
| 63 | * completely the opposite of managing mapping/pinning dynamically as |
| 64 | * required by RamDiscardManager. We would have to special-case sections |
| 65 | * with a RamDiscardManager. |
| 66 | */ |
| 67 | return ram_block_discard_disable(state); |
| 68 | } |
| 69 | } |
| 70 | |
| 71 | static int |
| 72 | vfio_legacy_dma_unmap_get_dirty_bitmap(const VFIOLegacyContainer *container, |
| 73 | hwaddr iova, uint64_t size, |
| 74 | IOMMUTLBEntry *iotlb) |
| 75 | { |
| 76 | const VFIOContainer *bcontainer = VFIO_IOMMU(container); |
| 77 | struct vfio_iommu_type1_dma_unmap *unmap; |
| 78 | struct vfio_bitmap *bitmap; |
| 79 | VFIOBitmap vbmap; |
| 80 | int ret; |
| 81 | |
| 82 | ret = vfio_bitmap_alloc(&vbmap, size); |
| 83 | if (ret) { |
| 84 | return ret; |
| 85 | } |
| 86 | |
| 87 | unmap = g_malloc0(sizeof(*unmap) + sizeof(*bitmap)); |
| 88 | |
| 89 | unmap->argsz = sizeof(*unmap) + sizeof(*bitmap); |
| 90 | unmap->iova = iova; |
| 91 | unmap->size = size; |
| 92 | unmap->flags |= VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP; |
| 93 | bitmap = (struct vfio_bitmap *)&unmap->data; |
| 94 | |
| 95 | /* |
| 96 | * physical_memory_set_dirty_lebitmap() supports pages in bitmap of |
| 97 | * qemu_real_host_page_size to mark those dirty. Hence set bitmap_pgsize |
| 98 | * to qemu_real_host_page_size. |
| 99 | */ |
| 100 | bitmap->pgsize = qemu_real_host_page_size(); |
| 101 | bitmap->size = vbmap.size; |
| 102 | bitmap->data = (__u64 *)vbmap.bitmap; |
| 103 | |
| 104 | if (vbmap.size > bcontainer->max_dirty_bitmap_size) { |
| 105 | error_report("UNMAP: Size of bitmap too big 0x%"PRIx64, vbmap.size); |
| 106 | ret = -E2BIG; |
| 107 | goto unmap_exit; |
| 108 | } |
| 109 | |
| 110 | ret = ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, unmap); |
| 111 | if (!ret) { |
| 112 | physical_memory_set_dirty_lebitmap(vbmap.bitmap, |
| 113 | iotlb->translated_addr, vbmap.pages); |
| 114 | } else { |
| 115 | error_report("VFIO_UNMAP_DMA with DIRTY_BITMAP : %m"); |
| 116 | } |
| 117 | |
| 118 | unmap_exit: |
| 119 | g_free(unmap); |
| 120 | g_free(vbmap.bitmap); |
| 121 | |
| 122 | return ret; |
| 123 | } |
| 124 | |
| 125 | static int vfio_legacy_dma_unmap_one(const VFIOLegacyContainer *container, |
| 126 | hwaddr iova, uint64_t size, |
| 127 | uint32_t flags, IOMMUTLBEntry *iotlb) |
| 128 | { |
| 129 | const VFIOContainer *bcontainer = VFIO_IOMMU(container); |
| 130 | struct vfio_iommu_type1_dma_unmap unmap = { |
| 131 | .argsz = sizeof(unmap), |
| 132 | .flags = flags, |
| 133 | .iova = iova, |
| 134 | .size = size, |
| 135 | }; |
| 136 | bool need_dirty_sync = false; |
| 137 | int ret; |
| 138 | Error *local_err = NULL; |
| 139 | |
| 140 | g_assert(!cpr_is_incoming()); |
| 141 | |
| 142 | if (iotlb && vfio_container_dirty_tracking_is_started(bcontainer)) { |
| 143 | if (!vfio_container_devices_dirty_tracking_is_supported(bcontainer) && |
| 144 | bcontainer->dirty_pages_supported) { |
| 145 | return vfio_legacy_dma_unmap_get_dirty_bitmap(container, iova, size, |
| 146 | iotlb); |
| 147 | } |
| 148 | |
| 149 | need_dirty_sync = true; |
| 150 | } |
| 151 | |
| 152 | if (ioctl(container->fd, VFIO_IOMMU_UNMAP_DMA, &unmap)) { |
| 153 | return -errno; |
| 154 | } |
| 155 | |
| 156 | if (need_dirty_sync) { |
| 157 | ret = vfio_container_query_dirty_bitmap(bcontainer, iova, size, 0, |
| 158 | iotlb->translated_addr, &local_err); |
| 159 | if (ret) { |
| 160 | error_report_err(local_err); |
| 161 | return ret; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | return 0; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * DMA - Mapping and unmapping for the "type1" IOMMU interface used on x86 |
| 170 | */ |
| 171 | static int vfio_legacy_dma_unmap(const VFIOContainer *bcontainer, |
| 172 | hwaddr iova, uint64_t size, |
| 173 | IOMMUTLBEntry *iotlb, bool unmap_all) |
| 174 | { |
| 175 | const VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); |
| 176 | uint32_t flags = 0; |
| 177 | int ret; |
| 178 | |
| 179 | if (unmap_all) { |
| 180 | if (container->unmap_all_supported) { |
| 181 | flags = VFIO_DMA_UNMAP_FLAG_ALL; |
| 182 | } else { |
| 183 | /* The unmap ioctl doesn't accept a full 64-bit span. */ |
| 184 | Int128 llsize = int128_rshift(int128_2_64(), 1); |
| 185 | size = int128_get64(llsize); |
| 186 | |
| 187 | ret = vfio_legacy_dma_unmap_one(container, 0, size, flags, iotlb); |
| 188 | if (ret) { |
| 189 | return ret; |
| 190 | } |
| 191 | |
| 192 | iova = size; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | return vfio_legacy_dma_unmap_one(container, iova, size, flags, iotlb); |
| 197 | } |
| 198 | |
| 199 | static int vfio_legacy_dma_map(const VFIOContainer *bcontainer, hwaddr iova, |
| 200 | uint64_t size, void *vaddr, bool readonly, |
| 201 | MemoryRegion *mr) |
| 202 | { |
| 203 | const VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); |
| 204 | struct vfio_iommu_type1_dma_map map = { |
| 205 | .argsz = sizeof(map), |
| 206 | .flags = VFIO_DMA_MAP_FLAG_READ, |
| 207 | .vaddr = (__u64)(uintptr_t)vaddr, |
| 208 | .iova = iova, |
| 209 | .size = size, |
| 210 | }; |
| 211 | |
| 212 | if (!readonly) { |
| 213 | map.flags |= VFIO_DMA_MAP_FLAG_WRITE; |
| 214 | } |
| 215 | |
| 216 | /* |
| 217 | * Try the mapping, if it fails with EBUSY, unmap the region and try |
| 218 | * again. This shouldn't be necessary, but we sometimes see it in |
| 219 | * the VGA ROM space. |
| 220 | */ |
| 221 | if (ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0 || |
| 222 | (errno == EBUSY && |
| 223 | vfio_legacy_dma_unmap(bcontainer, iova, size, NULL, false) == 0 && |
| 224 | ioctl(container->fd, VFIO_IOMMU_MAP_DMA, &map) == 0)) { |
| 225 | return 0; |
| 226 | } |
| 227 | |
| 228 | return -errno; |
| 229 | } |
| 230 | |
| 231 | static int |
| 232 | vfio_legacy_set_dirty_page_tracking(const VFIOContainer *bcontainer, |
| 233 | bool start, Error **errp) |
| 234 | { |
| 235 | const VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); |
| 236 | int ret; |
| 237 | struct vfio_iommu_type1_dirty_bitmap dirty = { |
| 238 | .argsz = sizeof(dirty), |
| 239 | }; |
| 240 | |
| 241 | if (start) { |
| 242 | dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_START; |
| 243 | } else { |
| 244 | dirty.flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_STOP; |
| 245 | } |
| 246 | |
| 247 | ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, &dirty); |
| 248 | if (ret) { |
| 249 | ret = -errno; |
| 250 | error_setg_errno(errp, errno, "Failed to set dirty tracking flag 0x%x", |
| 251 | dirty.flags); |
| 252 | } |
| 253 | |
| 254 | return ret; |
| 255 | } |
| 256 | |
| 257 | static int vfio_legacy_query_dirty_bitmap(const VFIOContainer *bcontainer, |
| 258 | VFIOBitmap *vbmap, hwaddr iova, hwaddr size, |
| 259 | uint64_t backend_flag, Error **errp) |
| 260 | { |
| 261 | const VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); |
| 262 | struct vfio_iommu_type1_dirty_bitmap *dbitmap; |
| 263 | struct vfio_iommu_type1_dirty_bitmap_get *range; |
| 264 | int ret; |
| 265 | |
| 266 | dbitmap = g_malloc0(sizeof(*dbitmap) + sizeof(*range)); |
| 267 | |
| 268 | dbitmap->argsz = sizeof(*dbitmap) + sizeof(*range); |
| 269 | dbitmap->flags = VFIO_IOMMU_DIRTY_PAGES_FLAG_GET_BITMAP; |
| 270 | range = (struct vfio_iommu_type1_dirty_bitmap_get *)&dbitmap->data; |
| 271 | range->iova = iova; |
| 272 | range->size = size; |
| 273 | |
| 274 | /* |
| 275 | * physical_memory_set_dirty_lebitmap() supports pages in bitmap of |
| 276 | * qemu_real_host_page_size to mark those dirty. Hence set bitmap's pgsize |
| 277 | * to qemu_real_host_page_size. |
| 278 | */ |
| 279 | range->bitmap.pgsize = qemu_real_host_page_size(); |
| 280 | range->bitmap.size = vbmap->size; |
| 281 | range->bitmap.data = (__u64 *)vbmap->bitmap; |
| 282 | |
| 283 | ret = ioctl(container->fd, VFIO_IOMMU_DIRTY_PAGES, dbitmap); |
| 284 | if (ret) { |
| 285 | ret = -errno; |
| 286 | error_setg_errno(errp, errno, |
| 287 | "Failed to get dirty bitmap for iova: 0x%"PRIx64 |
| 288 | " size: 0x%"PRIx64, (uint64_t)range->iova, |
| 289 | (uint64_t)range->size); |
| 290 | } |
| 291 | |
| 292 | g_free(dbitmap); |
| 293 | |
| 294 | return ret; |
| 295 | } |
| 296 | |
| 297 | static bool vfio_get_info_iova_range(struct vfio_iommu_type1_info *info, |
| 298 | VFIOContainer *bcontainer) |
| 299 | { |
| 300 | struct vfio_info_cap_header *hdr; |
| 301 | struct vfio_iommu_type1_info_cap_iova_range *cap; |
| 302 | |
| 303 | hdr = vfio_get_iommu_type1_info_cap(info, |
| 304 | VFIO_IOMMU_TYPE1_INFO_CAP_IOVA_RANGE); |
| 305 | if (!hdr) { |
| 306 | return false; |
| 307 | } |
| 308 | |
| 309 | cap = (void *)hdr; |
| 310 | |
| 311 | for (int i = 0; i < cap->nr_iovas; i++) { |
| 312 | Range *range = g_new(Range, 1); |
| 313 | |
| 314 | range_set_bounds(range, cap->iova_ranges[i].start, |
| 315 | cap->iova_ranges[i].end); |
| 316 | bcontainer->iova_ranges = |
| 317 | range_list_insert(bcontainer->iova_ranges, range); |
| 318 | } |
| 319 | |
| 320 | return true; |
| 321 | } |
| 322 | |
| 323 | static void vfio_group_add_kvm_device(VFIOGroup *group) |
| 324 | { |
| 325 | Error *err = NULL; |
| 326 | |
| 327 | if (vfio_kvm_device_add_fd(group->fd, &err)) { |
| 328 | error_reportf_err(err, "group ID %d: ", group->groupid); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | static void vfio_group_del_kvm_device(VFIOGroup *group) |
| 333 | { |
| 334 | Error *err = NULL; |
| 335 | |
| 336 | if (vfio_kvm_device_del_fd(group->fd, &err)) { |
| 337 | error_reportf_err(err, "group ID %d: ", group->groupid); |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * vfio_get_iommu_type - selects the richest iommu_type (v2 first) |
| 343 | */ |
| 344 | static int vfio_get_iommu_type(int container_fd, |
| 345 | Error **errp) |
| 346 | { |
| 347 | int iommu_types[] = { VFIO_TYPE1v2_IOMMU, VFIO_TYPE1_IOMMU, |
| 348 | VFIO_SPAPR_TCE_v2_IOMMU, VFIO_SPAPR_TCE_IOMMU }; |
| 349 | int i; |
| 350 | |
| 351 | for (i = 0; i < ARRAY_SIZE(iommu_types); i++) { |
| 352 | if (ioctl(container_fd, VFIO_CHECK_EXTENSION, iommu_types[i])) { |
| 353 | return iommu_types[i]; |
| 354 | } |
| 355 | } |
| 356 | error_setg(errp, "No available IOMMU models"); |
| 357 | return -EINVAL; |
| 358 | } |
| 359 | |
| 360 | /* |
| 361 | * vfio_get_iommu_ops - get a VFIOIOMMUClass associated with a type |
| 362 | */ |
| 363 | static const char *vfio_get_iommu_class_name(int iommu_type) |
| 364 | { |
| 365 | switch (iommu_type) { |
| 366 | case VFIO_TYPE1v2_IOMMU: |
| 367 | case VFIO_TYPE1_IOMMU: |
| 368 | return TYPE_VFIO_IOMMU_LEGACY; |
| 369 | break; |
| 370 | case VFIO_SPAPR_TCE_v2_IOMMU: |
| 371 | case VFIO_SPAPR_TCE_IOMMU: |
| 372 | return TYPE_VFIO_IOMMU_SPAPR; |
| 373 | break; |
| 374 | default: |
| 375 | g_assert_not_reached(); |
| 376 | }; |
| 377 | } |
| 378 | |
| 379 | static bool vfio_set_iommu(int container_fd, int group_fd, |
| 380 | int *iommu_type, Error **errp) |
| 381 | { |
| 382 | if (ioctl(group_fd, VFIO_GROUP_SET_CONTAINER, &container_fd)) { |
| 383 | error_setg_errno(errp, errno, "Failed to set group container"); |
| 384 | return false; |
| 385 | } |
| 386 | |
| 387 | while (ioctl(container_fd, VFIO_SET_IOMMU, *iommu_type)) { |
| 388 | if (*iommu_type == VFIO_SPAPR_TCE_v2_IOMMU) { |
| 389 | /* |
| 390 | * On sPAPR, despite the IOMMU subdriver always advertises v1 and |
| 391 | * v2, the running platform may not support v2 and there is no |
| 392 | * way to guess it until an IOMMU group gets added to the container. |
| 393 | * So in case it fails with v2, try v1 as a fallback. |
| 394 | */ |
| 395 | *iommu_type = VFIO_SPAPR_TCE_IOMMU; |
| 396 | continue; |
| 397 | } |
| 398 | error_setg_errno(errp, errno, "Failed to set iommu for container"); |
| 399 | return false; |
| 400 | } |
| 401 | |
| 402 | return true; |
| 403 | } |
| 404 | |
| 405 | static VFIOLegacyContainer *vfio_create_container(int fd, VFIOGroup *group, |
| 406 | Error **errp) |
| 407 | { |
| 408 | int iommu_type; |
| 409 | const char *vioc_name; |
| 410 | VFIOLegacyContainer *container; |
| 411 | |
| 412 | iommu_type = vfio_get_iommu_type(fd, errp); |
| 413 | if (iommu_type < 0) { |
| 414 | return NULL; |
| 415 | } |
| 416 | |
| 417 | /* |
| 418 | * During CPR, just set the container type and skip the ioctls, as the |
| 419 | * container and group are already configured in the kernel. |
| 420 | */ |
| 421 | if (!cpr_is_incoming() && |
| 422 | !vfio_set_iommu(fd, group->fd, &iommu_type, errp)) { |
| 423 | return NULL; |
| 424 | } |
| 425 | |
| 426 | vioc_name = vfio_get_iommu_class_name(iommu_type); |
| 427 | |
| 428 | container = VFIO_IOMMU_LEGACY(object_new(vioc_name)); |
| 429 | container->fd = fd; |
| 430 | container->iommu_type = iommu_type; |
| 431 | return container; |
| 432 | } |
| 433 | |
| 434 | static int vfio_get_iommu_info(VFIOLegacyContainer *container, |
| 435 | struct vfio_iommu_type1_info **info) |
| 436 | { |
| 437 | |
| 438 | size_t argsz = sizeof(struct vfio_iommu_type1_info); |
| 439 | |
| 440 | *info = g_new0(struct vfio_iommu_type1_info, 1); |
| 441 | again: |
| 442 | (*info)->argsz = argsz; |
| 443 | |
| 444 | if (ioctl(container->fd, VFIO_IOMMU_GET_INFO, *info)) { |
| 445 | g_free(*info); |
| 446 | *info = NULL; |
| 447 | return -errno; |
| 448 | } |
| 449 | |
| 450 | if (((*info)->argsz > argsz)) { |
| 451 | argsz = (*info)->argsz; |
| 452 | *info = g_realloc(*info, argsz); |
| 453 | goto again; |
| 454 | } |
| 455 | |
| 456 | return 0; |
| 457 | } |
| 458 | |
| 459 | static struct vfio_info_cap_header * |
| 460 | vfio_get_iommu_info_cap(struct vfio_iommu_type1_info *info, uint16_t id) |
| 461 | { |
| 462 | struct vfio_info_cap_header *hdr; |
| 463 | void *ptr = info; |
| 464 | |
| 465 | if (!(info->flags & VFIO_IOMMU_INFO_CAPS)) { |
| 466 | return NULL; |
| 467 | } |
| 468 | |
| 469 | for (hdr = ptr + info->cap_offset; hdr != ptr; hdr = ptr + hdr->next) { |
| 470 | if (hdr->id == id) { |
| 471 | return hdr; |
| 472 | } |
| 473 | } |
| 474 | |
| 475 | return NULL; |
| 476 | } |
| 477 | |
| 478 | static void vfio_get_iommu_info_migration(VFIOLegacyContainer *container, |
| 479 | struct vfio_iommu_type1_info *info) |
| 480 | { |
| 481 | struct vfio_info_cap_header *hdr; |
| 482 | struct vfio_iommu_type1_info_cap_migration *cap_mig; |
| 483 | VFIOContainer *bcontainer = VFIO_IOMMU(container); |
| 484 | |
| 485 | hdr = vfio_get_iommu_info_cap(info, VFIO_IOMMU_TYPE1_INFO_CAP_MIGRATION); |
| 486 | if (!hdr) { |
| 487 | return; |
| 488 | } |
| 489 | |
| 490 | cap_mig = container_of(hdr, struct vfio_iommu_type1_info_cap_migration, |
| 491 | header); |
| 492 | |
| 493 | /* |
| 494 | * physical_memory_set_dirty_lebitmap() supports pages in bitmap of |
| 495 | * qemu_real_host_page_size to mark those dirty. |
| 496 | */ |
| 497 | if (cap_mig->pgsize_bitmap & qemu_real_host_page_size()) { |
| 498 | bcontainer->dirty_pages_supported = true; |
| 499 | bcontainer->max_dirty_bitmap_size = cap_mig->max_dirty_bitmap_size; |
| 500 | bcontainer->dirty_pgsizes = cap_mig->pgsize_bitmap; |
| 501 | } |
| 502 | } |
| 503 | |
| 504 | static bool vfio_legacy_setup(VFIOContainer *bcontainer, Error **errp) |
| 505 | { |
| 506 | VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(bcontainer); |
| 507 | g_autofree struct vfio_iommu_type1_info *info = NULL; |
| 508 | int ret; |
| 509 | |
| 510 | ret = vfio_get_iommu_info(container, &info); |
| 511 | if (ret) { |
| 512 | error_setg_errno(errp, -ret, "Failed to get VFIO IOMMU info"); |
| 513 | return false; |
| 514 | } |
| 515 | |
| 516 | if (info->flags & VFIO_IOMMU_INFO_PGSIZES) { |
| 517 | bcontainer->pgsizes = info->iova_pgsizes; |
| 518 | } else { |
| 519 | bcontainer->pgsizes = qemu_real_host_page_size(); |
| 520 | } |
| 521 | |
| 522 | if (!vfio_get_info_dma_avail(info, &bcontainer->dma_max_mappings)) { |
| 523 | bcontainer->dma_max_mappings = 65535; |
| 524 | } |
| 525 | |
| 526 | vfio_get_info_iova_range(info, bcontainer); |
| 527 | |
| 528 | ret = ioctl(container->fd, VFIO_CHECK_EXTENSION, VFIO_UNMAP_ALL); |
| 529 | container->unmap_all_supported = !!ret; |
| 530 | |
| 531 | vfio_get_iommu_info_migration(container, info); |
| 532 | return true; |
| 533 | } |
| 534 | |
| 535 | static bool vfio_container_attach_discard_disable( |
| 536 | VFIOLegacyContainer *container, VFIOGroup *group, Error **errp) |
| 537 | { |
| 538 | int ret; |
| 539 | |
| 540 | /* |
| 541 | * VFIO is currently incompatible with discarding of RAM insofar as the |
| 542 | * madvise to purge (zap) the page from QEMU's address space does not |
| 543 | * interact with the memory API and therefore leaves stale virtual to |
| 544 | * physical mappings in the IOMMU if the page was previously pinned. We |
| 545 | * therefore set discarding broken for each group added to a container, |
| 546 | * whether the container is used individually or shared. This provides |
| 547 | * us with options to allow devices within a group to opt-in and allow |
| 548 | * discarding, so long as it is done consistently for a group (for instance |
| 549 | * if the device is an mdev device where it is known that the host vendor |
| 550 | * driver will never pin pages outside of the working set of the guest |
| 551 | * driver, which would thus not be discarding candidates). |
| 552 | * |
| 553 | * The first opportunity to induce pinning occurs here where we attempt to |
| 554 | * attach the group to existing containers within the AddressSpace. If any |
| 555 | * pages are already zapped from the virtual address space, such as from |
| 556 | * previous discards, new pinning will cause valid mappings to be |
| 557 | * re-established. Likewise, when the overall MemoryListener for a new |
| 558 | * container is registered, a replay of mappings within the AddressSpace |
| 559 | * will occur, re-establishing any previously zapped pages as well. |
| 560 | * |
| 561 | * Especially virtio-balloon is currently only prevented from discarding |
| 562 | * new memory, it will not yet set ram_block_discard_set_required() and |
| 563 | * therefore, neither stops us here or deals with the sudden memory |
| 564 | * consumption of inflated memory. |
| 565 | * |
| 566 | * We do support discarding of memory coordinated via the RamDiscardManager |
| 567 | * with some IOMMU types. vfio_ram_block_discard_disable() handles the |
| 568 | * details once we know which type of IOMMU we are using. |
| 569 | */ |
| 570 | |
| 571 | ret = vfio_ram_block_discard_disable(container, true); |
| 572 | if (ret) { |
| 573 | error_setg_errno(errp, -ret, "Cannot set discarding of RAM broken"); |
| 574 | if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { |
| 575 | error_report("vfio: error disconnecting group %d from" |
| 576 | " container", group->groupid); |
| 577 | } |
| 578 | } |
| 579 | return !ret; |
| 580 | } |
| 581 | |
| 582 | static bool vfio_container_group_add(VFIOLegacyContainer *container, |
| 583 | VFIOGroup *group, Error **errp) |
| 584 | { |
| 585 | if (!vfio_container_attach_discard_disable(container, group, errp)) { |
| 586 | return false; |
| 587 | } |
| 588 | group->container = container; |
| 589 | QLIST_INSERT_HEAD(&container->group_list, group, container_next); |
| 590 | vfio_group_add_kvm_device(group); |
| 591 | /* |
| 592 | * Remember the container fd for each group, so we can attach to the same |
| 593 | * container after CPR. |
| 594 | */ |
| 595 | cpr_resave_fd("vfio_container_for_group", group->groupid, container->fd); |
| 596 | return true; |
| 597 | } |
| 598 | |
| 599 | static void vfio_container_group_del(VFIOLegacyContainer *container, |
| 600 | VFIOGroup *group) |
| 601 | { |
| 602 | QLIST_REMOVE(group, container_next); |
| 603 | group->container = NULL; |
| 604 | vfio_group_del_kvm_device(group); |
| 605 | vfio_ram_block_discard_disable(container, false); |
| 606 | cpr_delete_fd("vfio_container_for_group", group->groupid); |
| 607 | } |
| 608 | |
| 609 | static bool vfio_container_connect(VFIOGroup *group, AddressSpace *as, |
| 610 | Error **errp) |
| 611 | { |
| 612 | VFIOLegacyContainer *container; |
| 613 | VFIOContainer *bcontainer; |
| 614 | int ret, fd = -1; |
| 615 | VFIOAddressSpace *space; |
| 616 | VFIOIOMMUClass *vioc = NULL; |
| 617 | bool new_container = false; |
| 618 | bool group_was_added = false; |
| 619 | |
| 620 | space = vfio_address_space_get(as); |
| 621 | fd = cpr_find_fd("vfio_container_for_group", group->groupid); |
| 622 | |
| 623 | if (!cpr_is_incoming()) { |
| 624 | QLIST_FOREACH(bcontainer, &space->containers, next) { |
| 625 | container = VFIO_IOMMU_LEGACY(bcontainer); |
| 626 | if (!ioctl(group->fd, VFIO_GROUP_SET_CONTAINER, &container->fd)) { |
| 627 | return vfio_container_group_add(container, group, errp); |
| 628 | } |
| 629 | } |
| 630 | |
| 631 | fd = qemu_open("/dev/vfio/vfio", O_RDWR, errp); |
| 632 | if (fd < 0) { |
| 633 | goto fail; |
| 634 | } |
| 635 | } else { |
| 636 | /* |
| 637 | * For incoming CPR, the group is already attached in the kernel. |
| 638 | * If a container with matching fd is found, then update the |
| 639 | * userland group list and return. If not, then after the loop, |
| 640 | * create the container struct and group list. |
| 641 | */ |
| 642 | QLIST_FOREACH(bcontainer, &space->containers, next) { |
| 643 | container = VFIO_IOMMU_LEGACY(bcontainer); |
| 644 | |
| 645 | if (vfio_cpr_container_match(container, group, fd)) { |
| 646 | return vfio_container_group_add(container, group, errp); |
| 647 | } |
| 648 | } |
| 649 | } |
| 650 | |
| 651 | ret = ioctl(fd, VFIO_GET_API_VERSION); |
| 652 | if (ret != VFIO_API_VERSION) { |
| 653 | error_setg(errp, "supported vfio version: %d, " |
| 654 | "reported version: %d", VFIO_API_VERSION, ret); |
| 655 | goto fail; |
| 656 | } |
| 657 | |
| 658 | container = vfio_create_container(fd, group, errp); |
| 659 | if (!container) { |
| 660 | goto fail; |
| 661 | } |
| 662 | new_container = true; |
| 663 | bcontainer = VFIO_IOMMU(container); |
| 664 | |
| 665 | if (!vfio_legacy_cpr_register_container(container, errp)) { |
| 666 | goto fail; |
| 667 | } |
| 668 | |
| 669 | vioc = VFIO_IOMMU_GET_CLASS(bcontainer); |
| 670 | assert(vioc->setup); |
| 671 | |
| 672 | if (!vioc->setup(bcontainer, errp)) { |
| 673 | goto fail; |
| 674 | } |
| 675 | |
| 676 | vfio_address_space_insert(space, bcontainer); |
| 677 | |
| 678 | if (!vfio_container_group_add(container, group, errp)) { |
| 679 | goto fail; |
| 680 | } |
| 681 | group_was_added = true; |
| 682 | |
| 683 | /* |
| 684 | * If CPR, register the listener later, after all state that may |
| 685 | * affect regions and mapping boundaries has been cpr load'ed. Later, |
| 686 | * the listener will invoke its callback on each flat section and call |
| 687 | * dma_map to supply the new vaddr, and the calls will match the mappings |
| 688 | * remembered by the kernel. |
| 689 | */ |
| 690 | if (!cpr_is_incoming()) { |
| 691 | if (!vfio_listener_register(bcontainer, errp)) { |
| 692 | goto fail; |
| 693 | } |
| 694 | } |
| 695 | |
| 696 | bcontainer->initialized = true; |
| 697 | |
| 698 | return true; |
| 699 | |
| 700 | fail: |
| 701 | if (new_container) { |
| 702 | vfio_listener_unregister(bcontainer); |
| 703 | } |
| 704 | |
| 705 | if (group_was_added) { |
| 706 | vfio_container_group_del(container, group); |
| 707 | } |
| 708 | if (vioc && vioc->release) { |
| 709 | vioc->release(bcontainer); |
| 710 | } |
| 711 | if (new_container) { |
| 712 | vfio_legacy_cpr_unregister_container(container); |
| 713 | object_unref(container); |
| 714 | } |
| 715 | if (fd >= 0) { |
| 716 | close(fd); |
| 717 | } |
| 718 | vfio_address_space_put(space); |
| 719 | |
| 720 | return false; |
| 721 | } |
| 722 | |
| 723 | static void vfio_container_disconnect(VFIOGroup *group) |
| 724 | { |
| 725 | VFIOLegacyContainer *container = group->container; |
| 726 | VFIOContainer *bcontainer = VFIO_IOMMU(container); |
| 727 | VFIOIOMMUClass *vioc = VFIO_IOMMU_GET_CLASS(bcontainer); |
| 728 | |
| 729 | QLIST_REMOVE(group, container_next); |
| 730 | group->container = NULL; |
| 731 | cpr_delete_fd("vfio_container_for_group", group->groupid); |
| 732 | |
| 733 | /* |
| 734 | * Explicitly release the listener first before unset container, |
| 735 | * since unset may destroy the backend container if it's the last |
| 736 | * group. |
| 737 | */ |
| 738 | if (QLIST_EMPTY(&container->group_list)) { |
| 739 | vfio_listener_unregister(bcontainer); |
| 740 | if (vioc->release) { |
| 741 | vioc->release(bcontainer); |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | if (ioctl(group->fd, VFIO_GROUP_UNSET_CONTAINER, &container->fd)) { |
| 746 | error_report("vfio: error disconnecting group %d from container", |
| 747 | group->groupid); |
| 748 | } |
| 749 | |
| 750 | if (QLIST_EMPTY(&container->group_list)) { |
| 751 | VFIOAddressSpace *space = bcontainer->space; |
| 752 | |
| 753 | trace_vfio_container_disconnect(container->fd); |
| 754 | vfio_legacy_cpr_unregister_container(container); |
| 755 | close(container->fd); |
| 756 | object_unref(container); |
| 757 | |
| 758 | vfio_address_space_put(space); |
| 759 | } |
| 760 | } |
| 761 | |
| 762 | static VFIOGroup *vfio_group_get(int groupid, AddressSpace *as, Error **errp) |
| 763 | { |
| 764 | ERRP_GUARD(); |
| 765 | VFIOGroup *group; |
| 766 | char path[32]; |
| 767 | struct vfio_group_status status = { .argsz = sizeof(status) }; |
| 768 | |
| 769 | QLIST_FOREACH(group, &vfio_group_list, next) { |
| 770 | if (group->groupid == groupid) { |
| 771 | /* Found it. Now is it already in the right context? */ |
| 772 | if (VFIO_IOMMU(group->container)->space->as == as) { |
| 773 | return group; |
| 774 | } else { |
| 775 | error_setg(errp, "group %d used in multiple address spaces", |
| 776 | group->groupid); |
| 777 | return NULL; |
| 778 | } |
| 779 | } |
| 780 | } |
| 781 | |
| 782 | group = g_malloc0(sizeof(*group)); |
| 783 | |
| 784 | snprintf(path, sizeof(path), "/dev/vfio/%d", groupid); |
| 785 | group->fd = cpr_open_fd(path, O_RDWR, "vfio_group", groupid, errp); |
| 786 | if (group->fd < 0) { |
| 787 | goto free_group_exit; |
| 788 | } |
| 789 | |
| 790 | if (ioctl(group->fd, VFIO_GROUP_GET_STATUS, &status)) { |
| 791 | error_setg_errno(errp, errno, "failed to get group %d status", groupid); |
| 792 | goto close_fd_exit; |
| 793 | } |
| 794 | |
| 795 | if (!(status.flags & VFIO_GROUP_FLAGS_VIABLE)) { |
| 796 | error_setg(errp, "group %d is not viable", groupid); |
| 797 | error_append_hint(errp, |
| 798 | "Please ensure all devices within the iommu_group " |
| 799 | "are bound to their vfio bus driver.\n"); |
| 800 | goto close_fd_exit; |
| 801 | } |
| 802 | |
| 803 | group->groupid = groupid; |
| 804 | QLIST_INIT(&group->device_list); |
| 805 | |
| 806 | if (!vfio_container_connect(group, as, errp)) { |
| 807 | error_prepend(errp, "failed to setup container for group %d: ", |
| 808 | groupid); |
| 809 | goto close_fd_exit; |
| 810 | } |
| 811 | |
| 812 | QLIST_INSERT_HEAD(&vfio_group_list, group, next); |
| 813 | |
| 814 | return group; |
| 815 | |
| 816 | close_fd_exit: |
| 817 | cpr_delete_fd("vfio_group", groupid); |
| 818 | close(group->fd); |
| 819 | |
| 820 | free_group_exit: |
| 821 | g_free(group); |
| 822 | |
| 823 | return NULL; |
| 824 | } |
| 825 | |
| 826 | static void vfio_group_put(VFIOGroup *group) |
| 827 | { |
| 828 | if (!group || !QLIST_EMPTY(&group->device_list)) { |
| 829 | return; |
| 830 | } |
| 831 | |
| 832 | if (!group->ram_block_discard_allowed) { |
| 833 | vfio_ram_block_discard_disable(group->container, false); |
| 834 | } |
| 835 | vfio_group_del_kvm_device(group); |
| 836 | vfio_container_disconnect(group); |
| 837 | QLIST_REMOVE(group, next); |
| 838 | trace_vfio_group_put(group->fd); |
| 839 | cpr_delete_fd("vfio_group", group->groupid); |
| 840 | close(group->fd); |
| 841 | g_free(group); |
| 842 | } |
| 843 | |
| 844 | static bool vfio_device_get(VFIOGroup *group, const char *name, |
| 845 | VFIODevice *vbasedev, Error **errp) |
| 846 | { |
| 847 | g_autofree struct vfio_device_info *info = NULL; |
| 848 | int fd; |
| 849 | |
| 850 | fd = vfio_cpr_group_get_device_fd(group->fd, name); |
| 851 | if (fd < 0) { |
| 852 | error_setg_errno(errp, errno, "error getting device from group %d", |
| 853 | group->groupid); |
| 854 | error_append_hint(errp, |
| 855 | "Verify all devices in group %d are bound to vfio-<bus> " |
| 856 | "or pci-stub and not already in use\n", group->groupid); |
| 857 | return false; |
| 858 | } |
| 859 | |
| 860 | info = vfio_get_device_info(fd); |
| 861 | if (!info) { |
| 862 | error_setg_errno(errp, errno, "error getting device info"); |
| 863 | goto fail; |
| 864 | } |
| 865 | |
| 866 | /* |
| 867 | * Set discarding of RAM as not broken for this group if the driver knows |
| 868 | * the device operates compatibly with discarding. Setting must be |
| 869 | * consistent per group, but since compatibility is really only possible |
| 870 | * with mdev currently, we expect singleton groups. |
| 871 | */ |
| 872 | if (vbasedev->ram_block_discard_allowed != |
| 873 | group->ram_block_discard_allowed) { |
| 874 | if (!QLIST_EMPTY(&group->device_list)) { |
| 875 | error_setg(errp, "Inconsistent setting of support for discarding " |
| 876 | "RAM (e.g., balloon) within group"); |
| 877 | goto fail; |
| 878 | } |
| 879 | |
| 880 | if (!group->ram_block_discard_allowed) { |
| 881 | group->ram_block_discard_allowed = true; |
| 882 | vfio_ram_block_discard_disable(group->container, false); |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | vfio_device_prepare(vbasedev, VFIO_IOMMU(group->container), info); |
| 887 | |
| 888 | vbasedev->fd = fd; |
| 889 | vbasedev->group = group; |
| 890 | QLIST_INSERT_HEAD(&group->device_list, vbasedev, next); |
| 891 | |
| 892 | trace_vfio_device_get(name, info->flags, info->num_regions, info->num_irqs); |
| 893 | |
| 894 | return true; |
| 895 | |
| 896 | fail: |
| 897 | close(fd); |
| 898 | cpr_delete_fd(name, 0); |
| 899 | return false; |
| 900 | } |
| 901 | |
| 902 | static void vfio_device_put(VFIODevice *vbasedev) |
| 903 | { |
| 904 | if (!vbasedev->group) { |
| 905 | return; |
| 906 | } |
| 907 | QLIST_REMOVE(vbasedev, next); |
| 908 | vbasedev->group = NULL; |
| 909 | trace_vfio_device_put(vbasedev->fd); |
| 910 | cpr_delete_fd(vbasedev->name, 0); |
| 911 | close(vbasedev->fd); |
| 912 | } |
| 913 | |
| 914 | static int vfio_device_get_groupid(VFIODevice *vbasedev, Error **errp) |
| 915 | { |
| 916 | char *tmp, group_path[PATH_MAX]; |
| 917 | g_autofree char *group_name = NULL; |
| 918 | int ret, groupid; |
| 919 | ssize_t len; |
| 920 | |
| 921 | tmp = g_strdup_printf("%s/iommu_group", vbasedev->sysfsdev); |
| 922 | len = readlink(tmp, group_path, sizeof(group_path)); |
| 923 | g_free(tmp); |
| 924 | |
| 925 | if (len <= 0 || len >= sizeof(group_path)) { |
| 926 | ret = len < 0 ? -errno : -ENAMETOOLONG; |
| 927 | error_setg_errno(errp, -ret, "no iommu_group found"); |
| 928 | return ret; |
| 929 | } |
| 930 | |
| 931 | group_path[len] = 0; |
| 932 | |
| 933 | group_name = g_path_get_basename(group_path); |
| 934 | if (sscanf(group_name, "%d", &groupid) != 1) { |
| 935 | error_setg_errno(errp, errno, "failed to read %s", group_path); |
| 936 | return -errno; |
| 937 | } |
| 938 | return groupid; |
| 939 | } |
| 940 | |
| 941 | /* |
| 942 | * vfio_device_attach: attach a device to a security context |
| 943 | * @name and @vbasedev->name are likely to be different depending |
| 944 | * on the type of the device, hence the need for passing @name |
| 945 | */ |
| 946 | static bool vfio_legacy_attach_device(const char *name, VFIODevice *vbasedev, |
| 947 | AddressSpace *as, Error **errp) |
| 948 | { |
| 949 | int groupid = vfio_device_get_groupid(vbasedev, errp); |
| 950 | VFIODevice *vbasedev_iter; |
| 951 | VFIOGroup *group; |
| 952 | |
| 953 | if (groupid < 0) { |
| 954 | return false; |
| 955 | } |
| 956 | |
| 957 | trace_vfio_device_attach(vbasedev->name, groupid); |
| 958 | |
| 959 | group = vfio_group_get(groupid, as, errp); |
| 960 | if (!group) { |
| 961 | return false; |
| 962 | } |
| 963 | |
| 964 | QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { |
| 965 | if (strcmp(vbasedev_iter->name, vbasedev->name) == 0) { |
| 966 | error_setg(errp, "device is already attached"); |
| 967 | goto group_put_exit; |
| 968 | } |
| 969 | } |
| 970 | if (!vfio_device_get(group, name, vbasedev, errp)) { |
| 971 | goto group_put_exit; |
| 972 | } |
| 973 | |
| 974 | if (!vfio_device_hiod_create_and_realize(vbasedev, |
| 975 | TYPE_HOST_IOMMU_DEVICE_LEGACY_VFIO, |
| 976 | errp)) { |
| 977 | goto device_put_exit; |
| 978 | } |
| 979 | |
| 980 | if (vbasedev->mdev) { |
| 981 | error_setg(&vbasedev->cpr.mdev_blocker, |
| 982 | "CPR does not support vfio mdev %s", vbasedev->name); |
| 983 | if (migrate_add_blocker_modes(&vbasedev->cpr.mdev_blocker, |
| 984 | BIT(MIG_MODE_CPR_TRANSFER) | BIT(MIG_MODE_CPR_EXEC), |
| 985 | errp) < 0) { |
| 986 | goto hiod_unref_exit; |
| 987 | } |
| 988 | } |
| 989 | |
| 990 | return true; |
| 991 | |
| 992 | hiod_unref_exit: |
| 993 | object_unref(vbasedev->hiod); |
| 994 | device_put_exit: |
| 995 | vfio_device_put(vbasedev); |
| 996 | group_put_exit: |
| 997 | vfio_group_put(group); |
| 998 | return false; |
| 999 | } |
| 1000 | |
| 1001 | static void vfio_legacy_detach_device(VFIODevice *vbasedev) |
| 1002 | { |
| 1003 | VFIOGroup *group = vbasedev->group; |
| 1004 | |
| 1005 | trace_vfio_device_detach(vbasedev->name, group->groupid); |
| 1006 | |
| 1007 | vfio_device_unprepare(vbasedev); |
| 1008 | |
| 1009 | migrate_del_blocker(&vbasedev->cpr.mdev_blocker); |
| 1010 | object_unref(vbasedev->hiod); |
| 1011 | vfio_device_put(vbasedev); |
| 1012 | vfio_group_put(group); |
| 1013 | } |
| 1014 | |
| 1015 | static int vfio_legacy_pci_hot_reset(VFIODevice *vbasedev, bool single) |
| 1016 | { |
| 1017 | VFIOPCIDevice *vdev = container_of(vbasedev, VFIOPCIDevice, vbasedev); |
| 1018 | VFIOGroup *group; |
| 1019 | struct vfio_pci_hot_reset_info *info = NULL; |
| 1020 | struct vfio_pci_dependent_device *devices; |
| 1021 | struct vfio_pci_hot_reset *reset; |
| 1022 | int32_t *fds; |
| 1023 | int ret, i, count; |
| 1024 | bool multi = false; |
| 1025 | |
| 1026 | trace_vfio_pci_hot_reset(vdev->vbasedev.name, single ? "one" : "multi"); |
| 1027 | |
| 1028 | if (!single) { |
| 1029 | vfio_pci_pre_reset(vdev); |
| 1030 | } |
| 1031 | vdev->vbasedev.needs_reset = false; |
| 1032 | |
| 1033 | ret = vfio_pci_get_pci_hot_reset_info(vdev, &info); |
| 1034 | |
| 1035 | if (ret) { |
| 1036 | goto out_single; |
| 1037 | } |
| 1038 | devices = &info->devices[0]; |
| 1039 | |
| 1040 | trace_vfio_pci_hot_reset_has_dep_devices(vdev->vbasedev.name); |
| 1041 | |
| 1042 | /* Verify that we have all the groups required */ |
| 1043 | for (i = 0; i < info->count; i++) { |
| 1044 | PCIHostDeviceAddress host; |
| 1045 | VFIOPCIDevice *tmp; |
| 1046 | VFIODevice *vbasedev_iter; |
| 1047 | |
| 1048 | host.domain = devices[i].segment; |
| 1049 | host.bus = devices[i].bus; |
| 1050 | host.slot = PCI_SLOT(devices[i].devfn); |
| 1051 | host.function = PCI_FUNC(devices[i].devfn); |
| 1052 | |
| 1053 | trace_vfio_pci_hot_reset_dep_devices(host.domain, |
| 1054 | host.bus, host.slot, host.function, devices[i].group_id); |
| 1055 | |
| 1056 | if (vfio_pci_host_match(&host, vdev->vbasedev.name)) { |
| 1057 | continue; |
| 1058 | } |
| 1059 | |
| 1060 | QLIST_FOREACH(group, &vfio_group_list, next) { |
| 1061 | if (group->groupid == devices[i].group_id) { |
| 1062 | break; |
| 1063 | } |
| 1064 | } |
| 1065 | |
| 1066 | if (!group) { |
| 1067 | if (!vdev->has_pm_reset) { |
| 1068 | error_report("vfio: Cannot reset device %s, " |
| 1069 | "depends on group %d which is not owned.", |
| 1070 | vdev->vbasedev.name, devices[i].group_id); |
| 1071 | } |
| 1072 | ret = -EPERM; |
| 1073 | goto out; |
| 1074 | } |
| 1075 | |
| 1076 | /* Prep dependent devices for reset and clear our marker. */ |
| 1077 | QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { |
| 1078 | if (!qdev_is_realized(vbasedev_iter->dev) || |
| 1079 | !vfio_pci_from_vfio_device(vbasedev_iter)) { |
| 1080 | continue; |
| 1081 | } |
| 1082 | tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev); |
| 1083 | if (vfio_pci_host_match(&host, tmp->vbasedev.name)) { |
| 1084 | if (single) { |
| 1085 | ret = -EINVAL; |
| 1086 | goto out_single; |
| 1087 | } |
| 1088 | vfio_pci_pre_reset(tmp); |
| 1089 | tmp->vbasedev.needs_reset = false; |
| 1090 | multi = true; |
| 1091 | break; |
| 1092 | } |
| 1093 | } |
| 1094 | } |
| 1095 | |
| 1096 | if (!single && !multi) { |
| 1097 | ret = -EINVAL; |
| 1098 | goto out_single; |
| 1099 | } |
| 1100 | |
| 1101 | /* Determine how many group fds need to be passed */ |
| 1102 | count = 0; |
| 1103 | QLIST_FOREACH(group, &vfio_group_list, next) { |
| 1104 | for (i = 0; i < info->count; i++) { |
| 1105 | if (group->groupid == devices[i].group_id) { |
| 1106 | count++; |
| 1107 | break; |
| 1108 | } |
| 1109 | } |
| 1110 | } |
| 1111 | |
| 1112 | reset = g_malloc0(sizeof(*reset) + (count * sizeof(*fds))); |
| 1113 | reset->argsz = sizeof(*reset) + (count * sizeof(*fds)); |
| 1114 | fds = &reset->group_fds[0]; |
| 1115 | |
| 1116 | /* Fill in group fds */ |
| 1117 | QLIST_FOREACH(group, &vfio_group_list, next) { |
| 1118 | for (i = 0; i < info->count; i++) { |
| 1119 | if (group->groupid == devices[i].group_id) { |
| 1120 | fds[reset->count++] = group->fd; |
| 1121 | break; |
| 1122 | } |
| 1123 | } |
| 1124 | } |
| 1125 | |
| 1126 | /* Bus reset! */ |
| 1127 | ret = ioctl(vdev->vbasedev.fd, VFIO_DEVICE_PCI_HOT_RESET, reset); |
| 1128 | g_free(reset); |
| 1129 | if (ret) { |
| 1130 | ret = -errno; |
| 1131 | } |
| 1132 | |
| 1133 | trace_vfio_pci_hot_reset_result(vdev->vbasedev.name, |
| 1134 | ret ? strerror(errno) : "Success"); |
| 1135 | |
| 1136 | out: |
| 1137 | /* Re-enable INTx on affected devices */ |
| 1138 | for (i = 0; i < info->count; i++) { |
| 1139 | PCIHostDeviceAddress host; |
| 1140 | VFIOPCIDevice *tmp; |
| 1141 | VFIODevice *vbasedev_iter; |
| 1142 | |
| 1143 | host.domain = devices[i].segment; |
| 1144 | host.bus = devices[i].bus; |
| 1145 | host.slot = PCI_SLOT(devices[i].devfn); |
| 1146 | host.function = PCI_FUNC(devices[i].devfn); |
| 1147 | |
| 1148 | if (vfio_pci_host_match(&host, vdev->vbasedev.name)) { |
| 1149 | continue; |
| 1150 | } |
| 1151 | |
| 1152 | QLIST_FOREACH(group, &vfio_group_list, next) { |
| 1153 | if (group->groupid == devices[i].group_id) { |
| 1154 | break; |
| 1155 | } |
| 1156 | } |
| 1157 | |
| 1158 | if (!group) { |
| 1159 | break; |
| 1160 | } |
| 1161 | |
| 1162 | QLIST_FOREACH(vbasedev_iter, &group->device_list, next) { |
| 1163 | if (!qdev_is_realized(vbasedev_iter->dev) || |
| 1164 | !vfio_pci_from_vfio_device(vbasedev_iter)) { |
| 1165 | continue; |
| 1166 | } |
| 1167 | tmp = container_of(vbasedev_iter, VFIOPCIDevice, vbasedev); |
| 1168 | if (vfio_pci_host_match(&host, tmp->vbasedev.name)) { |
| 1169 | vfio_pci_post_reset(tmp); |
| 1170 | break; |
| 1171 | } |
| 1172 | } |
| 1173 | } |
| 1174 | out_single: |
| 1175 | if (!single) { |
| 1176 | vfio_pci_post_reset(vdev); |
| 1177 | } |
| 1178 | g_free(info); |
| 1179 | |
| 1180 | return ret; |
| 1181 | } |
| 1182 | |
| 1183 | static void vfio_iommu_legacy_class_init(ObjectClass *klass, const void *data) |
| 1184 | { |
| 1185 | VFIOIOMMUClass *vioc = VFIO_IOMMU_CLASS(klass); |
| 1186 | |
| 1187 | vioc->setup = vfio_legacy_setup; |
| 1188 | vioc->dma_map = vfio_legacy_dma_map; |
| 1189 | vioc->dma_unmap = vfio_legacy_dma_unmap; |
| 1190 | vioc->attach_device = vfio_legacy_attach_device; |
| 1191 | vioc->detach_device = vfio_legacy_detach_device; |
| 1192 | vioc->set_dirty_page_tracking = vfio_legacy_set_dirty_page_tracking; |
| 1193 | vioc->query_dirty_bitmap = vfio_legacy_query_dirty_bitmap; |
| 1194 | vioc->pci_hot_reset = vfio_legacy_pci_hot_reset; |
| 1195 | }; |
| 1196 | |
| 1197 | static bool hiod_legacy_vfio_realize(HostIOMMUDevice *hiod, void *opaque, |
| 1198 | Error **errp) |
| 1199 | { |
| 1200 | VFIODevice *vdev = opaque; |
| 1201 | |
| 1202 | hiod->name = g_strdup(vdev->name); |
| 1203 | hiod->agent = opaque; |
| 1204 | |
| 1205 | return true; |
| 1206 | } |
| 1207 | |
| 1208 | static int hiod_legacy_vfio_get_cap(HostIOMMUDevice *hiod, int cap, |
| 1209 | Error **errp) |
| 1210 | { |
| 1211 | switch (cap) { |
| 1212 | case HOST_IOMMU_DEVICE_CAP_AW_BITS: |
| 1213 | return vfio_device_get_aw_bits(hiod->agent); |
| 1214 | default: |
| 1215 | error_setg(errp, "%s: unsupported capability %x", hiod->name, cap); |
| 1216 | return -EINVAL; |
| 1217 | } |
| 1218 | } |
| 1219 | |
| 1220 | static GList * |
| 1221 | hiod_legacy_vfio_get_iova_ranges(HostIOMMUDevice *hiod) |
| 1222 | { |
| 1223 | VFIODevice *vdev = hiod->agent; |
| 1224 | |
| 1225 | g_assert(vdev); |
| 1226 | return vfio_container_get_iova_ranges(vdev->bcontainer); |
| 1227 | } |
| 1228 | |
| 1229 | static uint64_t |
| 1230 | hiod_legacy_vfio_get_page_size_mask(HostIOMMUDevice *hiod) |
| 1231 | { |
| 1232 | VFIODevice *vdev = hiod->agent; |
| 1233 | |
| 1234 | g_assert(vdev); |
| 1235 | return vfio_container_get_page_size_mask(vdev->bcontainer); |
| 1236 | } |
| 1237 | |
| 1238 | static void vfio_iommu_legacy_instance_init(Object *obj) |
| 1239 | { |
| 1240 | VFIOLegacyContainer *container = VFIO_IOMMU_LEGACY(obj); |
| 1241 | |
| 1242 | QLIST_INIT(&container->group_list); |
| 1243 | } |
| 1244 | |
| 1245 | static void hiod_legacy_vfio_class_init(ObjectClass *oc, const void *data) |
| 1246 | { |
| 1247 | HostIOMMUDeviceClass *hiodc = HOST_IOMMU_DEVICE_CLASS(oc); |
| 1248 | |
| 1249 | hiodc->realize = hiod_legacy_vfio_realize; |
| 1250 | hiodc->get_cap = hiod_legacy_vfio_get_cap; |
| 1251 | hiodc->get_iova_ranges = hiod_legacy_vfio_get_iova_ranges; |
| 1252 | hiodc->get_page_size_mask = hiod_legacy_vfio_get_page_size_mask; |
| 1253 | }; |
| 1254 | |
| 1255 | static const TypeInfo types[] = { |
| 1256 | { |
| 1257 | .name = TYPE_VFIO_IOMMU_LEGACY, |
| 1258 | .parent = TYPE_VFIO_IOMMU, |
| 1259 | .instance_init = vfio_iommu_legacy_instance_init, |
| 1260 | .instance_size = sizeof(VFIOLegacyContainer), |
| 1261 | .class_init = vfio_iommu_legacy_class_init, |
| 1262 | }, { |
| 1263 | .name = TYPE_HOST_IOMMU_DEVICE_LEGACY_VFIO, |
| 1264 | .parent = TYPE_HOST_IOMMU_DEVICE, |
| 1265 | .class_init = hiod_legacy_vfio_class_init, |
| 1266 | } |
| 1267 | }; |
| 1268 | |
| 1269 | DEFINE_TYPES(types) |