1 /* 2 * vhost-vdpa 3 * 4 * Copyright(c) 2017-2018 Intel Corporation. 5 * Copyright(c) 2020 Red Hat, Inc. 6 * 7 * This work is licensed under the terms of the GNU GPL, version 2 or later. 8 * See the COPYING file in the top-level directory. 9 * 10 */ 11 12 #include "qemu/osdep.h" 13 #include <linux/vhost.h> 14 #include <linux/vfio.h> 15 #include <sys/eventfd.h> 16 #include <sys/ioctl.h> 17 #include "exec/target_page.h" 18 #include "hw/virtio/vhost.h" 19 #include "hw/virtio/vhost-backend.h" 20 #include "hw/virtio/virtio-net.h" 21 #include "hw/virtio/vhost-shadow-virtqueue.h" 22 #include "hw/virtio/vhost-vdpa.h" 23 #include "exec/address-spaces.h" 24 #include "migration/blocker.h" 25 #include "qemu/cutils.h" 26 #include "qemu/main-loop.h" 27 #include "trace.h" 28 #include "qapi/error.h" 29 30 /* 31 * Return one past the end of the end of section. Be careful with uint64_t 32 * conversions! 33 */ 34 static Int128 vhost_vdpa_section_end(const MemoryRegionSection *section, 35 int page_mask) 36 { 37 Int128 llend = int128_make64(section->offset_within_address_space); 38 llend = int128_add(llend, section->size); 39 llend = int128_and(llend, int128_exts64(page_mask)); 40 41 return llend; 42 } 43 44 static bool vhost_vdpa_listener_skipped_section(MemoryRegionSection *section, 45 uint64_t iova_min, 46 uint64_t iova_max, 47 int page_mask) 48 { 49 Int128 llend; 50 bool is_ram = memory_region_is_ram(section->mr); 51 bool is_iommu = memory_region_is_iommu(section->mr); 52 bool is_protected = memory_region_is_protected(section->mr); 53 54 /* vhost-vDPA doesn't allow MMIO to be mapped */ 55 bool is_ram_device = memory_region_is_ram_device(section->mr); 56 57 if ((!is_ram && !is_iommu) || is_protected || is_ram_device) { 58 trace_vhost_vdpa_skipped_memory_section(is_ram, is_iommu, is_protected, 59 is_ram_device, iova_min, 60 iova_max, page_mask); 61 return true; 62 } 63 64 if (section->offset_within_address_space < iova_min) { 65 error_report("RAM section out of device range (min=0x%" PRIx64 66 ", addr=0x%" HWADDR_PRIx ")", 67 iova_min, section->offset_within_address_space); 68 return true; 69 } 70 /* 71 * While using vIOMMU, sometimes the section will be larger than iova_max, 72 * but the memory that actually maps is smaller, so move the check to 73 * function vhost_vdpa_iommu_map_notify(). That function will use the actual 74 * size that maps to the kernel 75 */ 76 77 if (!is_iommu) { 78 llend = vhost_vdpa_section_end(section, page_mask); 79 if (int128_gt(llend, int128_make64(iova_max))) { 80 error_report("RAM section out of device range (max=0x%" PRIx64 81 ", end addr=0x%" PRIx64 ")", 82 iova_max, int128_get64(llend)); 83 return true; 84 } 85 } 86 87 return false; 88 } 89 90 /* 91 * The caller must set asid = 0 if the device does not support asid. 92 * This is not an ABI break since it is set to 0 by the initializer anyway. 93 */ 94 int vhost_vdpa_dma_map(VhostVDPAShared *s, uint32_t asid, hwaddr iova, 95 hwaddr size, void *vaddr, bool readonly) 96 { 97 struct vhost_msg_v2 msg = {}; 98 int fd = s->device_fd; 99 int ret = 0; 100 101 msg.type = VHOST_IOTLB_MSG_V2; 102 msg.asid = asid; 103 msg.iotlb.iova = iova; 104 msg.iotlb.size = size; 105 msg.iotlb.uaddr = (uint64_t)(uintptr_t)vaddr; 106 msg.iotlb.perm = readonly ? VHOST_ACCESS_RO : VHOST_ACCESS_RW; 107 msg.iotlb.type = VHOST_IOTLB_UPDATE; 108 109 trace_vhost_vdpa_dma_map(s, fd, msg.type, msg.asid, msg.iotlb.iova, 110 msg.iotlb.size, msg.iotlb.uaddr, msg.iotlb.perm, 111 msg.iotlb.type); 112 113 if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { 114 error_report("failed to write, fd=%d, errno=%d (%s)", 115 fd, errno, strerror(errno)); 116 return -EIO ; 117 } 118 119 return ret; 120 } 121 122 /* 123 * The caller must set asid = 0 if the device does not support asid. 124 * This is not an ABI break since it is set to 0 by the initializer anyway. 125 */ 126 int vhost_vdpa_dma_unmap(VhostVDPAShared *s, uint32_t asid, hwaddr iova, 127 hwaddr size) 128 { 129 struct vhost_msg_v2 msg = {}; 130 int fd = s->device_fd; 131 int ret = 0; 132 133 msg.type = VHOST_IOTLB_MSG_V2; 134 msg.asid = asid; 135 msg.iotlb.iova = iova; 136 msg.iotlb.size = size; 137 msg.iotlb.type = VHOST_IOTLB_INVALIDATE; 138 139 trace_vhost_vdpa_dma_unmap(s, fd, msg.type, msg.asid, msg.iotlb.iova, 140 msg.iotlb.size, msg.iotlb.type); 141 142 if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { 143 error_report("failed to write, fd=%d, errno=%d (%s)", 144 fd, errno, strerror(errno)); 145 return -EIO ; 146 } 147 148 return ret; 149 } 150 151 static void vhost_vdpa_listener_begin_batch(VhostVDPAShared *s) 152 { 153 int fd = s->device_fd; 154 struct vhost_msg_v2 msg = { 155 .type = VHOST_IOTLB_MSG_V2, 156 .iotlb.type = VHOST_IOTLB_BATCH_BEGIN, 157 }; 158 159 trace_vhost_vdpa_listener_begin_batch(s, fd, msg.type, msg.iotlb.type); 160 if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { 161 error_report("failed to write, fd=%d, errno=%d (%s)", 162 fd, errno, strerror(errno)); 163 } 164 } 165 166 static void vhost_vdpa_iotlb_batch_begin_once(VhostVDPAShared *s) 167 { 168 if (s->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH) && 169 !s->iotlb_batch_begin_sent) { 170 vhost_vdpa_listener_begin_batch(s); 171 } 172 173 s->iotlb_batch_begin_sent = true; 174 } 175 176 static void vhost_vdpa_listener_commit(MemoryListener *listener) 177 { 178 VhostVDPAShared *s = container_of(listener, VhostVDPAShared, listener); 179 struct vhost_msg_v2 msg = {}; 180 int fd = s->device_fd; 181 182 if (!(s->backend_cap & (0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH))) { 183 return; 184 } 185 186 if (!s->iotlb_batch_begin_sent) { 187 return; 188 } 189 190 msg.type = VHOST_IOTLB_MSG_V2; 191 msg.iotlb.type = VHOST_IOTLB_BATCH_END; 192 193 trace_vhost_vdpa_listener_commit(s, fd, msg.type, msg.iotlb.type); 194 if (write(fd, &msg, sizeof(msg)) != sizeof(msg)) { 195 error_report("failed to write, fd=%d, errno=%d (%s)", 196 fd, errno, strerror(errno)); 197 } 198 199 s->iotlb_batch_begin_sent = false; 200 } 201 202 static void vhost_vdpa_iommu_map_notify(IOMMUNotifier *n, IOMMUTLBEntry *iotlb) 203 { 204 struct vdpa_iommu *iommu = container_of(n, struct vdpa_iommu, n); 205 206 hwaddr iova = iotlb->iova + iommu->iommu_offset; 207 VhostVDPAShared *s = iommu->dev_shared; 208 void *vaddr; 209 int ret; 210 Int128 llend; 211 Error *local_err = NULL; 212 213 if (iotlb->target_as != &address_space_memory) { 214 error_report("Wrong target AS \"%s\", only system memory is allowed", 215 iotlb->target_as->name ? iotlb->target_as->name : "none"); 216 return; 217 } 218 RCU_READ_LOCK_GUARD(); 219 /* check if RAM section out of device range */ 220 llend = int128_add(int128_makes64(iotlb->addr_mask), int128_makes64(iova)); 221 if (int128_gt(llend, int128_make64(s->iova_range.last))) { 222 error_report("RAM section out of device range (max=0x%" PRIx64 223 ", end addr=0x%" PRIx64 ")", 224 s->iova_range.last, int128_get64(llend)); 225 return; 226 } 227 228 if ((iotlb->perm & IOMMU_RW) != IOMMU_NONE) { 229 bool read_only; 230 231 if (!memory_get_xlat_addr(iotlb, &vaddr, NULL, &read_only, NULL, 232 &local_err)) { 233 error_report_err(local_err); 234 return; 235 } 236 ret = vhost_vdpa_dma_map(s, VHOST_VDPA_GUEST_PA_ASID, iova, 237 iotlb->addr_mask + 1, vaddr, read_only); 238 if (ret) { 239 error_report("vhost_vdpa_dma_map(%p, 0x%" HWADDR_PRIx ", " 240 "0x%" HWADDR_PRIx ", %p) = %d (%m)", 241 s, iova, iotlb->addr_mask + 1, vaddr, ret); 242 } 243 } else { 244 ret = vhost_vdpa_dma_unmap(s, VHOST_VDPA_GUEST_PA_ASID, iova, 245 iotlb->addr_mask + 1); 246 if (ret) { 247 error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", " 248 "0x%" HWADDR_PRIx ") = %d (%m)", 249 s, iova, iotlb->addr_mask + 1, ret); 250 } 251 } 252 } 253 254 static void vhost_vdpa_iommu_region_add(MemoryListener *listener, 255 MemoryRegionSection *section) 256 { 257 VhostVDPAShared *s = container_of(listener, VhostVDPAShared, listener); 258 259 struct vdpa_iommu *iommu; 260 Int128 end; 261 int iommu_idx; 262 IOMMUMemoryRegion *iommu_mr; 263 int ret; 264 265 iommu_mr = IOMMU_MEMORY_REGION(section->mr); 266 267 iommu = g_malloc0(sizeof(*iommu)); 268 end = int128_add(int128_make64(section->offset_within_region), 269 section->size); 270 end = int128_sub(end, int128_one()); 271 iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr, 272 MEMTXATTRS_UNSPECIFIED); 273 iommu->iommu_mr = iommu_mr; 274 iommu_notifier_init(&iommu->n, vhost_vdpa_iommu_map_notify, 275 IOMMU_NOTIFIER_IOTLB_EVENTS, 276 section->offset_within_region, 277 int128_get64(end), 278 iommu_idx); 279 iommu->iommu_offset = section->offset_within_address_space - 280 section->offset_within_region; 281 iommu->dev_shared = s; 282 283 ret = memory_region_register_iommu_notifier(section->mr, &iommu->n, NULL); 284 if (ret) { 285 g_free(iommu); 286 return; 287 } 288 289 QLIST_INSERT_HEAD(&s->iommu_list, iommu, iommu_next); 290 memory_region_iommu_replay(iommu->iommu_mr, &iommu->n); 291 292 return; 293 } 294 295 static void vhost_vdpa_iommu_region_del(MemoryListener *listener, 296 MemoryRegionSection *section) 297 { 298 VhostVDPAShared *s = container_of(listener, VhostVDPAShared, listener); 299 300 struct vdpa_iommu *iommu; 301 302 QLIST_FOREACH(iommu, &s->iommu_list, iommu_next) 303 { 304 if (MEMORY_REGION(iommu->iommu_mr) == section->mr && 305 iommu->n.start == section->offset_within_region) { 306 memory_region_unregister_iommu_notifier(section->mr, &iommu->n); 307 QLIST_REMOVE(iommu, iommu_next); 308 g_free(iommu); 309 break; 310 } 311 } 312 } 313 314 static void vhost_vdpa_listener_region_add(MemoryListener *listener, 315 MemoryRegionSection *section) 316 { 317 DMAMap mem_region = {}; 318 VhostVDPAShared *s = container_of(listener, VhostVDPAShared, listener); 319 hwaddr iova; 320 Int128 llend, llsize; 321 void *vaddr; 322 int ret; 323 int page_size = qemu_target_page_size(); 324 int page_mask = -page_size; 325 326 if (vhost_vdpa_listener_skipped_section(section, s->iova_range.first, 327 s->iova_range.last, page_mask)) { 328 return; 329 } 330 if (memory_region_is_iommu(section->mr)) { 331 vhost_vdpa_iommu_region_add(listener, section); 332 return; 333 } 334 335 if (unlikely((section->offset_within_address_space & ~page_mask) != 336 (section->offset_within_region & ~page_mask))) { 337 trace_vhost_vdpa_listener_region_add_unaligned(s, section->mr->name, 338 section->offset_within_address_space & ~page_mask, 339 section->offset_within_region & ~page_mask); 340 return; 341 } 342 343 iova = ROUND_UP(section->offset_within_address_space, page_size); 344 llend = vhost_vdpa_section_end(section, page_mask); 345 if (int128_ge(int128_make64(iova), llend)) { 346 return; 347 } 348 349 memory_region_ref(section->mr); 350 351 /* Here we assume that memory_region_is_ram(section->mr)==true */ 352 353 vaddr = memory_region_get_ram_ptr(section->mr) + 354 section->offset_within_region + 355 (iova - section->offset_within_address_space); 356 357 trace_vhost_vdpa_listener_region_add(s, iova, int128_get64(llend), 358 vaddr, section->readonly); 359 360 llsize = int128_sub(llend, int128_make64(iova)); 361 if (s->shadow_data) { 362 int r; 363 364 mem_region.translated_addr = (hwaddr)(uintptr_t)vaddr, 365 mem_region.size = int128_get64(llsize) - 1, 366 mem_region.perm = IOMMU_ACCESS_FLAG(true, section->readonly), 367 368 r = vhost_iova_tree_map_alloc(s->iova_tree, &mem_region); 369 if (unlikely(r != IOVA_OK)) { 370 error_report("Can't allocate a mapping (%d)", r); 371 goto fail; 372 } 373 374 iova = mem_region.iova; 375 } 376 377 vhost_vdpa_iotlb_batch_begin_once(s); 378 ret = vhost_vdpa_dma_map(s, VHOST_VDPA_GUEST_PA_ASID, iova, 379 int128_get64(llsize), vaddr, section->readonly); 380 if (ret) { 381 error_report("vhost vdpa map fail!"); 382 goto fail_map; 383 } 384 385 return; 386 387 fail_map: 388 if (s->shadow_data) { 389 vhost_iova_tree_remove(s->iova_tree, mem_region); 390 } 391 392 fail: 393 /* 394 * On the initfn path, store the first error in the container so we 395 * can gracefully fail. Runtime, there's not much we can do other 396 * than throw a hardware error. 397 */ 398 error_report("vhost-vdpa: DMA mapping failed, unable to continue"); 399 return; 400 401 } 402 403 static void vhost_vdpa_listener_region_del(MemoryListener *listener, 404 MemoryRegionSection *section) 405 { 406 VhostVDPAShared *s = container_of(listener, VhostVDPAShared, listener); 407 hwaddr iova; 408 Int128 llend, llsize; 409 int ret; 410 int page_size = qemu_target_page_size(); 411 int page_mask = -page_size; 412 413 if (vhost_vdpa_listener_skipped_section(section, s->iova_range.first, 414 s->iova_range.last, page_mask)) { 415 return; 416 } 417 if (memory_region_is_iommu(section->mr)) { 418 vhost_vdpa_iommu_region_del(listener, section); 419 } 420 421 if (unlikely((section->offset_within_address_space & ~page_mask) != 422 (section->offset_within_region & ~page_mask))) { 423 trace_vhost_vdpa_listener_region_del_unaligned(s, section->mr->name, 424 section->offset_within_address_space & ~page_mask, 425 section->offset_within_region & ~page_mask); 426 return; 427 } 428 429 iova = ROUND_UP(section->offset_within_address_space, page_size); 430 llend = vhost_vdpa_section_end(section, page_mask); 431 432 trace_vhost_vdpa_listener_region_del(s, iova, 433 int128_get64(int128_sub(llend, int128_one()))); 434 435 if (int128_ge(int128_make64(iova), llend)) { 436 return; 437 } 438 439 llsize = int128_sub(llend, int128_make64(iova)); 440 441 if (s->shadow_data) { 442 const DMAMap *result; 443 const void *vaddr = memory_region_get_ram_ptr(section->mr) + 444 section->offset_within_region + 445 (iova - section->offset_within_address_space); 446 DMAMap mem_region = { 447 .translated_addr = (hwaddr)(uintptr_t)vaddr, 448 .size = int128_get64(llsize) - 1, 449 }; 450 451 result = vhost_iova_tree_find_iova(s->iova_tree, &mem_region); 452 if (!result) { 453 /* The memory listener map wasn't mapped */ 454 return; 455 } 456 iova = result->iova; 457 vhost_iova_tree_remove(s->iova_tree, *result); 458 } 459 vhost_vdpa_iotlb_batch_begin_once(s); 460 /* 461 * The unmap ioctl doesn't accept a full 64-bit. need to check it 462 */ 463 if (int128_eq(llsize, int128_2_64())) { 464 llsize = int128_rshift(llsize, 1); 465 ret = vhost_vdpa_dma_unmap(s, VHOST_VDPA_GUEST_PA_ASID, iova, 466 int128_get64(llsize)); 467 468 if (ret) { 469 error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", " 470 "0x%" HWADDR_PRIx ") = %d (%m)", 471 s, iova, int128_get64(llsize), ret); 472 } 473 iova += int128_get64(llsize); 474 } 475 ret = vhost_vdpa_dma_unmap(s, VHOST_VDPA_GUEST_PA_ASID, iova, 476 int128_get64(llsize)); 477 478 if (ret) { 479 error_report("vhost_vdpa_dma_unmap(%p, 0x%" HWADDR_PRIx ", " 480 "0x%" HWADDR_PRIx ") = %d (%m)", 481 s, iova, int128_get64(llsize), ret); 482 } 483 484 memory_region_unref(section->mr); 485 } 486 /* 487 * IOTLB API is used by vhost-vdpa which requires incremental updating 488 * of the mapping. So we can not use generic vhost memory listener which 489 * depends on the addnop(). 490 */ 491 static const MemoryListener vhost_vdpa_memory_listener = { 492 .name = "vhost-vdpa", 493 .commit = vhost_vdpa_listener_commit, 494 .region_add = vhost_vdpa_listener_region_add, 495 .region_del = vhost_vdpa_listener_region_del, 496 }; 497 498 static int vhost_vdpa_call(struct vhost_dev *dev, unsigned long int request, 499 void *arg) 500 { 501 struct vhost_vdpa *v = dev->opaque; 502 int fd = v->shared->device_fd; 503 int ret; 504 505 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA); 506 507 ret = ioctl(fd, request, arg); 508 return ret < 0 ? -errno : ret; 509 } 510 511 static int vhost_vdpa_add_status(struct vhost_dev *dev, uint8_t status) 512 { 513 uint8_t s; 514 int ret; 515 516 trace_vhost_vdpa_add_status(dev, status); 517 ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &s); 518 if (ret < 0) { 519 return ret; 520 } 521 if ((s & status) == status) { 522 /* Don't set bits already set */ 523 return 0; 524 } 525 526 s |= status; 527 528 ret = vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &s); 529 if (ret < 0) { 530 return ret; 531 } 532 533 ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_STATUS, &s); 534 if (ret < 0) { 535 return ret; 536 } 537 538 if (!(s & status)) { 539 return -EIO; 540 } 541 542 return 0; 543 } 544 545 int vhost_vdpa_get_iova_range(int fd, struct vhost_vdpa_iova_range *iova_range) 546 { 547 int ret = ioctl(fd, VHOST_VDPA_GET_IOVA_RANGE, iova_range); 548 549 return ret < 0 ? -errno : 0; 550 } 551 552 /* 553 * The use of this function is for requests that only need to be 554 * applied once. Typically such request occurs at the beginning 555 * of operation, and before setting up queues. It should not be 556 * used for request that performs operation until all queues are 557 * set, which would need to check dev->vq_index_end instead. 558 */ 559 static bool vhost_vdpa_first_dev(struct vhost_dev *dev) 560 { 561 struct vhost_vdpa *v = dev->opaque; 562 563 return v->index == 0; 564 } 565 566 static bool vhost_vdpa_last_dev(struct vhost_dev *dev) 567 { 568 return dev->vq_index + dev->nvqs == dev->vq_index_end; 569 } 570 571 static int vhost_vdpa_get_dev_features(struct vhost_dev *dev, 572 uint64_t *features) 573 { 574 int ret; 575 576 ret = vhost_vdpa_call(dev, VHOST_GET_FEATURES, features); 577 trace_vhost_vdpa_get_features(dev, *features); 578 return ret; 579 } 580 581 static void vhost_vdpa_init_svq(struct vhost_dev *hdev, struct vhost_vdpa *v) 582 { 583 g_autoptr(GPtrArray) shadow_vqs = NULL; 584 585 shadow_vqs = g_ptr_array_new_full(hdev->nvqs, vhost_svq_free); 586 for (unsigned n = 0; n < hdev->nvqs; ++n) { 587 VhostShadowVirtqueue *svq; 588 589 svq = vhost_svq_new(v->shadow_vq_ops, v->shadow_vq_ops_opaque); 590 g_ptr_array_add(shadow_vqs, svq); 591 } 592 593 v->shadow_vqs = g_steal_pointer(&shadow_vqs); 594 } 595 596 static int vhost_vdpa_init(struct vhost_dev *dev, void *opaque, Error **errp) 597 { 598 struct vhost_vdpa *v = opaque; 599 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA); 600 trace_vhost_vdpa_init(dev, v->shared, opaque); 601 int ret; 602 603 v->dev = dev; 604 dev->opaque = opaque ; 605 v->shared->listener = vhost_vdpa_memory_listener; 606 vhost_vdpa_init_svq(dev, v); 607 608 error_propagate(&dev->migration_blocker, v->migration_blocker); 609 if (!vhost_vdpa_first_dev(dev)) { 610 return 0; 611 } 612 613 /* 614 * If dev->shadow_vqs_enabled at initialization that means the device has 615 * been started with x-svq=on, so don't block migration 616 */ 617 if (dev->migration_blocker == NULL && !v->shadow_vqs_enabled) { 618 /* We don't have dev->features yet */ 619 uint64_t features; 620 ret = vhost_vdpa_get_dev_features(dev, &features); 621 if (unlikely(ret)) { 622 error_setg_errno(errp, -ret, "Could not get device features"); 623 return ret; 624 } 625 vhost_svq_valid_features(features, &dev->migration_blocker); 626 } 627 628 /* 629 * Similar to VFIO, we end up pinning all guest memory and have to 630 * disable discarding of RAM. 631 */ 632 ret = ram_block_discard_disable(true); 633 if (ret) { 634 error_report("Cannot set discarding of RAM broken"); 635 return ret; 636 } 637 638 vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | 639 VIRTIO_CONFIG_S_DRIVER); 640 641 return 0; 642 } 643 644 static void vhost_vdpa_host_notifier_uninit(struct vhost_dev *dev, 645 int queue_index) 646 { 647 size_t page_size = qemu_real_host_page_size(); 648 struct vhost_vdpa *v = dev->opaque; 649 VirtIODevice *vdev = dev->vdev; 650 VhostVDPAHostNotifier *n; 651 652 n = &v->notifier[queue_index]; 653 654 if (n->addr) { 655 virtio_queue_set_host_notifier_mr(vdev, queue_index, &n->mr, false); 656 object_unparent(OBJECT(&n->mr)); 657 munmap(n->addr, page_size); 658 n->addr = NULL; 659 } 660 } 661 662 static int vhost_vdpa_host_notifier_init(struct vhost_dev *dev, int queue_index) 663 { 664 size_t page_size = qemu_real_host_page_size(); 665 struct vhost_vdpa *v = dev->opaque; 666 VirtIODevice *vdev = dev->vdev; 667 VhostVDPAHostNotifier *n; 668 int fd = v->shared->device_fd; 669 void *addr; 670 char *name; 671 672 vhost_vdpa_host_notifier_uninit(dev, queue_index); 673 674 n = &v->notifier[queue_index]; 675 676 addr = mmap(NULL, page_size, PROT_WRITE, MAP_SHARED, fd, 677 queue_index * page_size); 678 if (addr == MAP_FAILED) { 679 goto err; 680 } 681 682 name = g_strdup_printf("vhost-vdpa/host-notifier@%p mmaps[%d]", 683 v, queue_index); 684 memory_region_init_ram_device_ptr(&n->mr, OBJECT(vdev), name, 685 page_size, addr); 686 g_free(name); 687 688 if (virtio_queue_set_host_notifier_mr(vdev, queue_index, &n->mr, true)) { 689 object_unparent(OBJECT(&n->mr)); 690 munmap(addr, page_size); 691 goto err; 692 } 693 n->addr = addr; 694 695 return 0; 696 697 err: 698 return -1; 699 } 700 701 static void vhost_vdpa_host_notifiers_uninit(struct vhost_dev *dev, int n) 702 { 703 int i; 704 705 /* 706 * Pack all the changes to the memory regions in a single 707 * transaction to avoid a few updating of the address space 708 * topology. 709 */ 710 memory_region_transaction_begin(); 711 712 for (i = dev->vq_index; i < dev->vq_index + n; i++) { 713 vhost_vdpa_host_notifier_uninit(dev, i); 714 } 715 716 memory_region_transaction_commit(); 717 } 718 719 static void vhost_vdpa_host_notifiers_init(struct vhost_dev *dev) 720 { 721 struct vhost_vdpa *v = dev->opaque; 722 int i; 723 724 if (v->shadow_vqs_enabled) { 725 /* FIXME SVQ is not compatible with host notifiers mr */ 726 return; 727 } 728 729 /* 730 * Pack all the changes to the memory regions in a single 731 * transaction to avoid a few updating of the address space 732 * topology. 733 */ 734 memory_region_transaction_begin(); 735 736 for (i = dev->vq_index; i < dev->vq_index + dev->nvqs; i++) { 737 if (vhost_vdpa_host_notifier_init(dev, i)) { 738 vhost_vdpa_host_notifiers_uninit(dev, i - dev->vq_index); 739 break; 740 } 741 } 742 743 memory_region_transaction_commit(); 744 } 745 746 static void vhost_vdpa_svq_cleanup(struct vhost_dev *dev) 747 { 748 struct vhost_vdpa *v = dev->opaque; 749 size_t idx; 750 751 for (idx = 0; idx < v->shadow_vqs->len; ++idx) { 752 vhost_svq_stop(g_ptr_array_index(v->shadow_vqs, idx)); 753 } 754 g_ptr_array_free(v->shadow_vqs, true); 755 } 756 757 static int vhost_vdpa_cleanup(struct vhost_dev *dev) 758 { 759 struct vhost_vdpa *v; 760 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA); 761 v = dev->opaque; 762 trace_vhost_vdpa_cleanup(dev, v); 763 if (vhost_vdpa_first_dev(dev)) { 764 ram_block_discard_disable(false); 765 memory_listener_unregister(&v->shared->listener); 766 } 767 768 vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); 769 vhost_vdpa_svq_cleanup(dev); 770 771 dev->opaque = NULL; 772 773 return 0; 774 } 775 776 static int vhost_vdpa_memslots_limit(struct vhost_dev *dev) 777 { 778 trace_vhost_vdpa_memslots_limit(dev, INT_MAX); 779 return INT_MAX; 780 } 781 782 static int vhost_vdpa_set_mem_table(struct vhost_dev *dev, 783 struct vhost_memory *mem) 784 { 785 if (!vhost_vdpa_first_dev(dev)) { 786 return 0; 787 } 788 789 trace_vhost_vdpa_set_mem_table(dev, mem->nregions, mem->padding); 790 if (trace_event_get_state_backends(TRACE_VHOST_VDPA_SET_MEM_TABLE) && 791 trace_event_get_state_backends(TRACE_VHOST_VDPA_DUMP_REGIONS)) { 792 int i; 793 for (i = 0; i < mem->nregions; i++) { 794 trace_vhost_vdpa_dump_regions(dev, i, 795 mem->regions[i].guest_phys_addr, 796 mem->regions[i].memory_size, 797 mem->regions[i].userspace_addr, 798 mem->regions[i].flags_padding); 799 } 800 } 801 if (mem->padding) { 802 return -EINVAL; 803 } 804 805 return 0; 806 } 807 808 static int vhost_vdpa_set_features(struct vhost_dev *dev, 809 uint64_t features) 810 { 811 struct vhost_vdpa *v = dev->opaque; 812 int ret; 813 814 if (!vhost_vdpa_first_dev(dev)) { 815 return 0; 816 } 817 818 if (v->shadow_vqs_enabled) { 819 if ((v->acked_features ^ features) == BIT_ULL(VHOST_F_LOG_ALL)) { 820 /* 821 * QEMU is just trying to enable or disable logging. SVQ handles 822 * this sepparately, so no need to forward this. 823 */ 824 v->acked_features = features; 825 return 0; 826 } 827 828 v->acked_features = features; 829 830 /* We must not ack _F_LOG if SVQ is enabled */ 831 features &= ~BIT_ULL(VHOST_F_LOG_ALL); 832 } 833 834 trace_vhost_vdpa_set_features(dev, features); 835 ret = vhost_vdpa_call(dev, VHOST_SET_FEATURES, &features); 836 if (ret) { 837 return ret; 838 } 839 840 return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_FEATURES_OK); 841 } 842 843 static int vhost_vdpa_set_backend_cap(struct vhost_dev *dev) 844 { 845 struct vhost_vdpa *v = dev->opaque; 846 847 uint64_t features; 848 uint64_t f = 0x1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2 | 849 0x1ULL << VHOST_BACKEND_F_IOTLB_BATCH | 850 0x1ULL << VHOST_BACKEND_F_IOTLB_ASID | 851 0x1ULL << VHOST_BACKEND_F_SUSPEND; 852 int r; 853 854 if (vhost_vdpa_call(dev, VHOST_GET_BACKEND_FEATURES, &features)) { 855 return -EFAULT; 856 } 857 858 features &= f; 859 860 if (vhost_vdpa_first_dev(dev)) { 861 r = vhost_vdpa_call(dev, VHOST_SET_BACKEND_FEATURES, &features); 862 if (r) { 863 return -EFAULT; 864 } 865 } 866 867 dev->backend_cap = features; 868 v->shared->backend_cap = features; 869 870 return 0; 871 } 872 873 static int vhost_vdpa_get_device_id(struct vhost_dev *dev, 874 uint32_t *device_id) 875 { 876 int ret; 877 ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_DEVICE_ID, device_id); 878 trace_vhost_vdpa_get_device_id(dev, *device_id); 879 return ret; 880 } 881 882 static int vhost_vdpa_reset_device(struct vhost_dev *dev) 883 { 884 struct vhost_vdpa *v = dev->opaque; 885 int ret; 886 uint8_t status = 0; 887 888 ret = vhost_vdpa_call(dev, VHOST_VDPA_SET_STATUS, &status); 889 trace_vhost_vdpa_reset_device(dev); 890 v->suspended = false; 891 return ret; 892 } 893 894 static int vhost_vdpa_get_vq_index(struct vhost_dev *dev, int idx) 895 { 896 assert(idx >= dev->vq_index && idx < dev->vq_index + dev->nvqs); 897 898 trace_vhost_vdpa_get_vq_index(dev, idx, idx); 899 return idx; 900 } 901 902 static int vhost_vdpa_set_vring_enable_one(struct vhost_vdpa *v, unsigned idx, 903 int enable) 904 { 905 struct vhost_dev *dev = v->dev; 906 struct vhost_vring_state state = { 907 .index = idx, 908 .num = enable, 909 }; 910 int r = vhost_vdpa_call(dev, VHOST_VDPA_SET_VRING_ENABLE, &state); 911 912 trace_vhost_vdpa_set_vring_enable_one(dev, idx, enable, r); 913 return r; 914 } 915 916 static int vhost_vdpa_set_vring_enable(struct vhost_dev *dev, int enable) 917 { 918 struct vhost_vdpa *v = dev->opaque; 919 unsigned int i; 920 int ret; 921 922 for (i = 0; i < dev->nvqs; ++i) { 923 ret = vhost_vdpa_set_vring_enable_one(v, i, enable); 924 if (ret < 0) { 925 return ret; 926 } 927 } 928 929 return 0; 930 } 931 932 int vhost_vdpa_set_vring_ready(struct vhost_vdpa *v, unsigned idx) 933 { 934 return vhost_vdpa_set_vring_enable_one(v, idx, 1); 935 } 936 937 static int vhost_vdpa_set_config_call(struct vhost_dev *dev, 938 int fd) 939 { 940 trace_vhost_vdpa_set_config_call(dev, fd); 941 return vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG_CALL, &fd); 942 } 943 944 static void vhost_vdpa_dump_config(struct vhost_dev *dev, const uint8_t *config, 945 uint32_t config_len) 946 { 947 g_autoptr(GString) str = g_string_sized_new(4 * 16); 948 size_t b, len; 949 950 for (b = 0; b < config_len; b += len) { 951 len = MIN(config_len - b, 16); 952 953 g_string_truncate(str, 0); 954 qemu_hexdump_line(str, config + b, len, 1, 4); 955 trace_vhost_vdpa_dump_config(dev, b, str->str); 956 } 957 } 958 959 static int vhost_vdpa_set_config(struct vhost_dev *dev, const uint8_t *data, 960 uint32_t offset, uint32_t size, 961 uint32_t flags) 962 { 963 struct vhost_vdpa_config *config; 964 int ret; 965 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 966 967 trace_vhost_vdpa_set_config(dev, offset, size, flags); 968 config = g_malloc(size + config_size); 969 config->off = offset; 970 config->len = size; 971 memcpy(config->buf, data, size); 972 if (trace_event_get_state_backends(TRACE_VHOST_VDPA_SET_CONFIG) && 973 trace_event_get_state_backends(TRACE_VHOST_VDPA_DUMP_CONFIG)) { 974 vhost_vdpa_dump_config(dev, data, size); 975 } 976 ret = vhost_vdpa_call(dev, VHOST_VDPA_SET_CONFIG, config); 977 g_free(config); 978 return ret; 979 } 980 981 static int vhost_vdpa_get_config(struct vhost_dev *dev, uint8_t *config, 982 uint32_t config_len, Error **errp) 983 { 984 struct vhost_vdpa_config *v_config; 985 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 986 int ret; 987 988 trace_vhost_vdpa_get_config(dev, config, config_len); 989 v_config = g_malloc(config_len + config_size); 990 v_config->len = config_len; 991 v_config->off = 0; 992 ret = vhost_vdpa_call(dev, VHOST_VDPA_GET_CONFIG, v_config); 993 memcpy(config, v_config->buf, config_len); 994 g_free(v_config); 995 if (trace_event_get_state_backends(TRACE_VHOST_VDPA_GET_CONFIG) && 996 trace_event_get_state_backends(TRACE_VHOST_VDPA_DUMP_CONFIG)) { 997 vhost_vdpa_dump_config(dev, config, config_len); 998 } 999 return ret; 1000 } 1001 1002 static int vhost_vdpa_set_dev_vring_base(struct vhost_dev *dev, 1003 struct vhost_vring_state *ring) 1004 { 1005 struct vhost_vdpa *v = dev->opaque; 1006 1007 trace_vhost_vdpa_set_dev_vring_base(dev, ring->index, ring->num, 1008 v->shadow_vqs_enabled); 1009 return vhost_vdpa_call(dev, VHOST_SET_VRING_BASE, ring); 1010 } 1011 1012 static int vhost_vdpa_set_vring_dev_kick(struct vhost_dev *dev, 1013 struct vhost_vring_file *file) 1014 { 1015 trace_vhost_vdpa_set_vring_kick(dev, file->index, file->fd); 1016 return vhost_vdpa_call(dev, VHOST_SET_VRING_KICK, file); 1017 } 1018 1019 static int vhost_vdpa_set_vring_dev_call(struct vhost_dev *dev, 1020 struct vhost_vring_file *file) 1021 { 1022 trace_vhost_vdpa_set_vring_call(dev, file->index, file->fd); 1023 return vhost_vdpa_call(dev, VHOST_SET_VRING_CALL, file); 1024 } 1025 1026 static int vhost_vdpa_set_vring_dev_addr(struct vhost_dev *dev, 1027 struct vhost_vring_addr *addr) 1028 { 1029 trace_vhost_vdpa_set_vring_addr(dev, addr->index, addr->flags, 1030 addr->desc_user_addr, addr->used_user_addr, 1031 addr->avail_user_addr, 1032 addr->log_guest_addr); 1033 1034 return vhost_vdpa_call(dev, VHOST_SET_VRING_ADDR, addr); 1035 1036 } 1037 1038 /** 1039 * Set the shadow virtqueue descriptors to the device 1040 * 1041 * @dev: The vhost device model 1042 * @svq: The shadow virtqueue 1043 * @idx: The index of the virtqueue in the vhost device 1044 * @errp: Error 1045 * 1046 * Note that this function does not rewind kick file descriptor if cannot set 1047 * call one. 1048 */ 1049 static int vhost_vdpa_svq_set_fds(struct vhost_dev *dev, 1050 VhostShadowVirtqueue *svq, unsigned idx, 1051 Error **errp) 1052 { 1053 struct vhost_vring_file file = { 1054 .index = dev->vq_index + idx, 1055 }; 1056 const EventNotifier *event_notifier = &svq->hdev_kick; 1057 int r; 1058 1059 r = event_notifier_init(&svq->hdev_kick, 0); 1060 if (r != 0) { 1061 error_setg_errno(errp, -r, "Couldn't create kick event notifier"); 1062 goto err_init_hdev_kick; 1063 } 1064 1065 r = event_notifier_init(&svq->hdev_call, 0); 1066 if (r != 0) { 1067 error_setg_errno(errp, -r, "Couldn't create call event notifier"); 1068 goto err_init_hdev_call; 1069 } 1070 1071 file.fd = event_notifier_get_fd(event_notifier); 1072 r = vhost_vdpa_set_vring_dev_kick(dev, &file); 1073 if (unlikely(r != 0)) { 1074 error_setg_errno(errp, -r, "Can't set device kick fd"); 1075 goto err_init_set_dev_fd; 1076 } 1077 1078 event_notifier = &svq->hdev_call; 1079 file.fd = event_notifier_get_fd(event_notifier); 1080 r = vhost_vdpa_set_vring_dev_call(dev, &file); 1081 if (unlikely(r != 0)) { 1082 error_setg_errno(errp, -r, "Can't set device call fd"); 1083 goto err_init_set_dev_fd; 1084 } 1085 1086 return 0; 1087 1088 err_init_set_dev_fd: 1089 event_notifier_set_handler(&svq->hdev_call, NULL); 1090 1091 err_init_hdev_call: 1092 event_notifier_cleanup(&svq->hdev_kick); 1093 1094 err_init_hdev_kick: 1095 return r; 1096 } 1097 1098 /** 1099 * Unmap a SVQ area in the device 1100 */ 1101 static void vhost_vdpa_svq_unmap_ring(struct vhost_vdpa *v, hwaddr addr) 1102 { 1103 const DMAMap needle = { 1104 .translated_addr = addr, 1105 }; 1106 const DMAMap *result = vhost_iova_tree_find_iova(v->shared->iova_tree, 1107 &needle); 1108 hwaddr size; 1109 int r; 1110 1111 if (unlikely(!result)) { 1112 error_report("Unable to find SVQ address to unmap"); 1113 return; 1114 } 1115 1116 size = ROUND_UP(result->size, qemu_real_host_page_size()); 1117 r = vhost_vdpa_dma_unmap(v->shared, v->address_space_id, result->iova, 1118 size); 1119 if (unlikely(r < 0)) { 1120 error_report("Unable to unmap SVQ vring: %s (%d)", g_strerror(-r), -r); 1121 return; 1122 } 1123 1124 vhost_iova_tree_remove(v->shared->iova_tree, *result); 1125 } 1126 1127 static void vhost_vdpa_svq_unmap_rings(struct vhost_dev *dev, 1128 const VhostShadowVirtqueue *svq) 1129 { 1130 struct vhost_vdpa *v = dev->opaque; 1131 struct vhost_vring_addr svq_addr; 1132 1133 vhost_svq_get_vring_addr(svq, &svq_addr); 1134 1135 vhost_vdpa_svq_unmap_ring(v, svq_addr.desc_user_addr); 1136 1137 vhost_vdpa_svq_unmap_ring(v, svq_addr.used_user_addr); 1138 } 1139 1140 /** 1141 * Map the SVQ area in the device 1142 * 1143 * @v: Vhost-vdpa device 1144 * @needle: The area to search iova 1145 * @errorp: Error pointer 1146 */ 1147 static bool vhost_vdpa_svq_map_ring(struct vhost_vdpa *v, DMAMap *needle, 1148 Error **errp) 1149 { 1150 int r; 1151 1152 r = vhost_iova_tree_map_alloc(v->shared->iova_tree, needle); 1153 if (unlikely(r != IOVA_OK)) { 1154 error_setg(errp, "Cannot allocate iova (%d)", r); 1155 return false; 1156 } 1157 1158 r = vhost_vdpa_dma_map(v->shared, v->address_space_id, needle->iova, 1159 needle->size + 1, 1160 (void *)(uintptr_t)needle->translated_addr, 1161 needle->perm == IOMMU_RO); 1162 if (unlikely(r != 0)) { 1163 error_setg_errno(errp, -r, "Cannot map region to device"); 1164 vhost_iova_tree_remove(v->shared->iova_tree, *needle); 1165 } 1166 1167 return r == 0; 1168 } 1169 1170 /** 1171 * Map the shadow virtqueue rings in the device 1172 * 1173 * @dev: The vhost device 1174 * @svq: The shadow virtqueue 1175 * @addr: Assigned IOVA addresses 1176 * @errp: Error pointer 1177 */ 1178 static bool vhost_vdpa_svq_map_rings(struct vhost_dev *dev, 1179 const VhostShadowVirtqueue *svq, 1180 struct vhost_vring_addr *addr, 1181 Error **errp) 1182 { 1183 ERRP_GUARD(); 1184 DMAMap device_region, driver_region; 1185 struct vhost_vring_addr svq_addr; 1186 struct vhost_vdpa *v = dev->opaque; 1187 size_t device_size = vhost_svq_device_area_size(svq); 1188 size_t driver_size = vhost_svq_driver_area_size(svq); 1189 size_t avail_offset; 1190 bool ok; 1191 1192 vhost_svq_get_vring_addr(svq, &svq_addr); 1193 1194 driver_region = (DMAMap) { 1195 .translated_addr = svq_addr.desc_user_addr, 1196 .size = driver_size - 1, 1197 .perm = IOMMU_RO, 1198 }; 1199 ok = vhost_vdpa_svq_map_ring(v, &driver_region, errp); 1200 if (unlikely(!ok)) { 1201 error_prepend(errp, "Cannot create vq driver region: "); 1202 return false; 1203 } 1204 addr->desc_user_addr = driver_region.iova; 1205 avail_offset = svq_addr.avail_user_addr - svq_addr.desc_user_addr; 1206 addr->avail_user_addr = driver_region.iova + avail_offset; 1207 1208 device_region = (DMAMap) { 1209 .translated_addr = svq_addr.used_user_addr, 1210 .size = device_size - 1, 1211 .perm = IOMMU_RW, 1212 }; 1213 ok = vhost_vdpa_svq_map_ring(v, &device_region, errp); 1214 if (unlikely(!ok)) { 1215 error_prepend(errp, "Cannot create vq device region: "); 1216 vhost_vdpa_svq_unmap_ring(v, driver_region.translated_addr); 1217 } 1218 addr->used_user_addr = device_region.iova; 1219 1220 return ok; 1221 } 1222 1223 static bool vhost_vdpa_svq_setup(struct vhost_dev *dev, 1224 VhostShadowVirtqueue *svq, unsigned idx, 1225 Error **errp) 1226 { 1227 uint16_t vq_index = dev->vq_index + idx; 1228 struct vhost_vring_state s = { 1229 .index = vq_index, 1230 }; 1231 int r; 1232 1233 r = vhost_vdpa_set_dev_vring_base(dev, &s); 1234 if (unlikely(r)) { 1235 error_setg_errno(errp, -r, "Cannot set vring base"); 1236 return false; 1237 } 1238 1239 r = vhost_vdpa_svq_set_fds(dev, svq, idx, errp); 1240 return r == 0; 1241 } 1242 1243 static bool vhost_vdpa_svqs_start(struct vhost_dev *dev) 1244 { 1245 struct vhost_vdpa *v = dev->opaque; 1246 Error *err = NULL; 1247 unsigned i; 1248 1249 if (!v->shadow_vqs_enabled) { 1250 return true; 1251 } 1252 1253 for (i = 0; i < v->shadow_vqs->len; ++i) { 1254 VirtQueue *vq = virtio_get_queue(dev->vdev, dev->vq_index + i); 1255 VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, i); 1256 struct vhost_vring_addr addr = { 1257 .index = dev->vq_index + i, 1258 }; 1259 int r; 1260 bool ok = vhost_vdpa_svq_setup(dev, svq, i, &err); 1261 if (unlikely(!ok)) { 1262 goto err; 1263 } 1264 1265 vhost_svq_start(svq, dev->vdev, vq, v->shared->iova_tree); 1266 ok = vhost_vdpa_svq_map_rings(dev, svq, &addr, &err); 1267 if (unlikely(!ok)) { 1268 goto err_map; 1269 } 1270 1271 /* Override vring GPA set by vhost subsystem */ 1272 r = vhost_vdpa_set_vring_dev_addr(dev, &addr); 1273 if (unlikely(r != 0)) { 1274 error_setg_errno(&err, -r, "Cannot set device address"); 1275 goto err_set_addr; 1276 } 1277 } 1278 1279 return true; 1280 1281 err_set_addr: 1282 vhost_vdpa_svq_unmap_rings(dev, g_ptr_array_index(v->shadow_vqs, i)); 1283 1284 err_map: 1285 vhost_svq_stop(g_ptr_array_index(v->shadow_vqs, i)); 1286 1287 err: 1288 error_reportf_err(err, "Cannot setup SVQ %u: ", i); 1289 for (unsigned j = 0; j < i; ++j) { 1290 VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, j); 1291 vhost_vdpa_svq_unmap_rings(dev, svq); 1292 vhost_svq_stop(svq); 1293 } 1294 1295 return false; 1296 } 1297 1298 static void vhost_vdpa_svqs_stop(struct vhost_dev *dev) 1299 { 1300 struct vhost_vdpa *v = dev->opaque; 1301 1302 if (!v->shadow_vqs_enabled) { 1303 return; 1304 } 1305 1306 for (unsigned i = 0; i < v->shadow_vqs->len; ++i) { 1307 VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, i); 1308 1309 vhost_svq_stop(svq); 1310 vhost_vdpa_svq_unmap_rings(dev, svq); 1311 1312 event_notifier_cleanup(&svq->hdev_kick); 1313 event_notifier_cleanup(&svq->hdev_call); 1314 } 1315 } 1316 1317 static void vhost_vdpa_suspend(struct vhost_dev *dev) 1318 { 1319 struct vhost_vdpa *v = dev->opaque; 1320 int r; 1321 1322 if (!vhost_vdpa_first_dev(dev)) { 1323 return; 1324 } 1325 1326 if (dev->backend_cap & BIT_ULL(VHOST_BACKEND_F_SUSPEND)) { 1327 trace_vhost_vdpa_suspend(dev); 1328 r = ioctl(v->shared->device_fd, VHOST_VDPA_SUSPEND); 1329 if (unlikely(r)) { 1330 error_report("Cannot suspend: %s(%d)", g_strerror(errno), errno); 1331 } else { 1332 v->suspended = true; 1333 return; 1334 } 1335 } 1336 1337 vhost_vdpa_reset_device(dev); 1338 } 1339 1340 static int vhost_vdpa_dev_start(struct vhost_dev *dev, bool started) 1341 { 1342 struct vhost_vdpa *v = dev->opaque; 1343 bool ok; 1344 trace_vhost_vdpa_dev_start(dev, started); 1345 1346 if (started) { 1347 vhost_vdpa_host_notifiers_init(dev); 1348 ok = vhost_vdpa_svqs_start(dev); 1349 if (unlikely(!ok)) { 1350 return -1; 1351 } 1352 } else { 1353 vhost_vdpa_suspend(dev); 1354 vhost_vdpa_svqs_stop(dev); 1355 vhost_vdpa_host_notifiers_uninit(dev, dev->nvqs); 1356 } 1357 1358 if (!vhost_vdpa_last_dev(dev)) { 1359 return 0; 1360 } 1361 1362 if (started) { 1363 if (vhost_dev_has_iommu(dev) && (v->shadow_vqs_enabled)) { 1364 error_report("SVQ can not work while IOMMU enable, please disable" 1365 "IOMMU and try again"); 1366 return -1; 1367 } 1368 memory_listener_register(&v->shared->listener, dev->vdev->dma_as); 1369 1370 return vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_DRIVER_OK); 1371 } 1372 1373 return 0; 1374 } 1375 1376 static void vhost_vdpa_reset_status(struct vhost_dev *dev) 1377 { 1378 struct vhost_vdpa *v = dev->opaque; 1379 1380 if (!vhost_vdpa_last_dev(dev)) { 1381 return; 1382 } 1383 1384 vhost_vdpa_reset_device(dev); 1385 vhost_vdpa_add_status(dev, VIRTIO_CONFIG_S_ACKNOWLEDGE | 1386 VIRTIO_CONFIG_S_DRIVER); 1387 memory_listener_unregister(&v->shared->listener); 1388 } 1389 1390 static int vhost_vdpa_set_log_base(struct vhost_dev *dev, uint64_t base, 1391 struct vhost_log *log) 1392 { 1393 struct vhost_vdpa *v = dev->opaque; 1394 if (v->shadow_vqs_enabled || !vhost_vdpa_first_dev(dev)) { 1395 return 0; 1396 } 1397 1398 trace_vhost_vdpa_set_log_base(dev, base, log->size, log->refcnt, log->fd, 1399 log->log); 1400 return vhost_vdpa_call(dev, VHOST_SET_LOG_BASE, &base); 1401 } 1402 1403 static int vhost_vdpa_set_vring_addr(struct vhost_dev *dev, 1404 struct vhost_vring_addr *addr) 1405 { 1406 struct vhost_vdpa *v = dev->opaque; 1407 1408 if (v->shadow_vqs_enabled) { 1409 /* 1410 * Device vring addr was set at device start. SVQ base is handled by 1411 * VirtQueue code. 1412 */ 1413 return 0; 1414 } 1415 1416 return vhost_vdpa_set_vring_dev_addr(dev, addr); 1417 } 1418 1419 static int vhost_vdpa_set_vring_num(struct vhost_dev *dev, 1420 struct vhost_vring_state *ring) 1421 { 1422 trace_vhost_vdpa_set_vring_num(dev, ring->index, ring->num); 1423 return vhost_vdpa_call(dev, VHOST_SET_VRING_NUM, ring); 1424 } 1425 1426 static int vhost_vdpa_set_vring_base(struct vhost_dev *dev, 1427 struct vhost_vring_state *ring) 1428 { 1429 struct vhost_vdpa *v = dev->opaque; 1430 1431 if (v->shadow_vqs_enabled) { 1432 /* 1433 * Device vring base was set at device start. SVQ base is handled by 1434 * VirtQueue code. 1435 */ 1436 return 0; 1437 } 1438 1439 return vhost_vdpa_set_dev_vring_base(dev, ring); 1440 } 1441 1442 static int vhost_vdpa_get_vring_base(struct vhost_dev *dev, 1443 struct vhost_vring_state *ring) 1444 { 1445 struct vhost_vdpa *v = dev->opaque; 1446 int ret; 1447 1448 if (v->shadow_vqs_enabled) { 1449 ring->num = virtio_queue_get_last_avail_idx(dev->vdev, ring->index); 1450 trace_vhost_vdpa_get_vring_base(dev, ring->index, ring->num, true); 1451 return 0; 1452 } 1453 1454 if (!v->suspended) { 1455 /* 1456 * Cannot trust in value returned by device, let vhost recover used 1457 * idx from guest. 1458 */ 1459 return -1; 1460 } 1461 1462 ret = vhost_vdpa_call(dev, VHOST_GET_VRING_BASE, ring); 1463 trace_vhost_vdpa_get_vring_base(dev, ring->index, ring->num, false); 1464 return ret; 1465 } 1466 1467 static int vhost_vdpa_set_vring_kick(struct vhost_dev *dev, 1468 struct vhost_vring_file *file) 1469 { 1470 struct vhost_vdpa *v = dev->opaque; 1471 int vdpa_idx = file->index - dev->vq_index; 1472 1473 if (v->shadow_vqs_enabled) { 1474 VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, vdpa_idx); 1475 vhost_svq_set_svq_kick_fd(svq, file->fd); 1476 return 0; 1477 } else { 1478 return vhost_vdpa_set_vring_dev_kick(dev, file); 1479 } 1480 } 1481 1482 static int vhost_vdpa_set_vring_call(struct vhost_dev *dev, 1483 struct vhost_vring_file *file) 1484 { 1485 struct vhost_vdpa *v = dev->opaque; 1486 int vdpa_idx = file->index - dev->vq_index; 1487 VhostShadowVirtqueue *svq = g_ptr_array_index(v->shadow_vqs, vdpa_idx); 1488 1489 /* Remember last call fd because we can switch to SVQ anytime. */ 1490 vhost_svq_set_svq_call_fd(svq, file->fd); 1491 /* 1492 * When SVQ is transitioning to off, shadow_vqs_enabled has 1493 * not been set back to false yet, but the underlying call fd 1494 * will have to switch back to the guest notifier to signal the 1495 * passthrough virtqueues. In other situations, SVQ's own call 1496 * fd shall be used to signal the device model. 1497 */ 1498 if (v->shadow_vqs_enabled && 1499 v->shared->svq_switching != SVQ_TSTATE_DISABLING) { 1500 return 0; 1501 } 1502 1503 return vhost_vdpa_set_vring_dev_call(dev, file); 1504 } 1505 1506 static int vhost_vdpa_get_features(struct vhost_dev *dev, 1507 uint64_t *features) 1508 { 1509 int ret = vhost_vdpa_get_dev_features(dev, features); 1510 1511 if (ret == 0) { 1512 /* Add SVQ logging capabilities */ 1513 *features |= BIT_ULL(VHOST_F_LOG_ALL); 1514 } 1515 1516 return ret; 1517 } 1518 1519 static int vhost_vdpa_set_owner(struct vhost_dev *dev) 1520 { 1521 if (!vhost_vdpa_first_dev(dev)) { 1522 return 0; 1523 } 1524 1525 trace_vhost_vdpa_set_owner(dev); 1526 return vhost_vdpa_call(dev, VHOST_SET_OWNER, NULL); 1527 } 1528 1529 static int vhost_vdpa_vq_get_addr(struct vhost_dev *dev, 1530 struct vhost_vring_addr *addr, struct vhost_virtqueue *vq) 1531 { 1532 assert(dev->vhost_ops->backend_type == VHOST_BACKEND_TYPE_VDPA); 1533 addr->desc_user_addr = (uint64_t)(unsigned long)vq->desc_phys; 1534 addr->avail_user_addr = (uint64_t)(unsigned long)vq->avail_phys; 1535 addr->used_user_addr = (uint64_t)(unsigned long)vq->used_phys; 1536 trace_vhost_vdpa_vq_get_addr(dev, vq, addr->desc_user_addr, 1537 addr->avail_user_addr, addr->used_user_addr); 1538 return 0; 1539 } 1540 1541 static bool vhost_vdpa_force_iommu(struct vhost_dev *dev) 1542 { 1543 return true; 1544 } 1545 1546 const VhostOps vdpa_ops = { 1547 .backend_type = VHOST_BACKEND_TYPE_VDPA, 1548 .vhost_backend_init = vhost_vdpa_init, 1549 .vhost_backend_cleanup = vhost_vdpa_cleanup, 1550 .vhost_set_log_base = vhost_vdpa_set_log_base, 1551 .vhost_set_vring_addr = vhost_vdpa_set_vring_addr, 1552 .vhost_set_vring_num = vhost_vdpa_set_vring_num, 1553 .vhost_set_vring_base = vhost_vdpa_set_vring_base, 1554 .vhost_get_vring_base = vhost_vdpa_get_vring_base, 1555 .vhost_set_vring_kick = vhost_vdpa_set_vring_kick, 1556 .vhost_set_vring_call = vhost_vdpa_set_vring_call, 1557 .vhost_get_features = vhost_vdpa_get_features, 1558 .vhost_set_backend_cap = vhost_vdpa_set_backend_cap, 1559 .vhost_set_owner = vhost_vdpa_set_owner, 1560 .vhost_set_vring_endian = NULL, 1561 .vhost_backend_memslots_limit = vhost_vdpa_memslots_limit, 1562 .vhost_set_mem_table = vhost_vdpa_set_mem_table, 1563 .vhost_set_features = vhost_vdpa_set_features, 1564 .vhost_reset_device = vhost_vdpa_reset_device, 1565 .vhost_get_vq_index = vhost_vdpa_get_vq_index, 1566 .vhost_set_vring_enable = vhost_vdpa_set_vring_enable, 1567 .vhost_get_config = vhost_vdpa_get_config, 1568 .vhost_set_config = vhost_vdpa_set_config, 1569 .vhost_requires_shm_log = NULL, 1570 .vhost_migration_done = NULL, 1571 .vhost_net_set_mtu = NULL, 1572 .vhost_set_iotlb_callback = NULL, 1573 .vhost_send_device_iotlb_msg = NULL, 1574 .vhost_dev_start = vhost_vdpa_dev_start, 1575 .vhost_get_device_id = vhost_vdpa_get_device_id, 1576 .vhost_vq_get_addr = vhost_vdpa_vq_get_addr, 1577 .vhost_force_iommu = vhost_vdpa_force_iommu, 1578 .vhost_set_config_call = vhost_vdpa_set_config_call, 1579 .vhost_reset_status = vhost_vdpa_reset_status, 1580 }; 1581