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