1 /* 2 * vhost-vdpa.c 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 "clients.h" 14 #include "hw/virtio/virtio-net.h" 15 #include "net/vhost_net.h" 16 #include "net/vhost-vdpa.h" 17 #include "hw/virtio/vhost-vdpa.h" 18 #include "qemu/config-file.h" 19 #include "qemu/error-report.h" 20 #include "qemu/log.h" 21 #include "qemu/memalign.h" 22 #include "qemu/option.h" 23 #include "qapi/error.h" 24 #include <linux/vhost.h> 25 #include <sys/ioctl.h> 26 #include <err.h> 27 #include "standard-headers/linux/virtio_net.h" 28 #include "monitor/monitor.h" 29 #include "migration/migration.h" 30 #include "migration/misc.h" 31 #include "hw/virtio/vhost.h" 32 33 /* Todo:need to add the multiqueue support here */ 34 typedef struct VhostVDPAState { 35 NetClientState nc; 36 struct vhost_vdpa vhost_vdpa; 37 NotifierWithReturn migration_state; 38 VHostNetState *vhost_net; 39 40 /* Control commands shadow buffers */ 41 void *cvq_cmd_out_buffer; 42 virtio_net_ctrl_ack *status; 43 44 /* The device always have SVQ enabled */ 45 bool always_svq; 46 47 /* The device can isolate CVQ in its own ASID */ 48 bool cvq_isolated; 49 50 bool started; 51 } VhostVDPAState; 52 53 /* 54 * The array is sorted alphabetically in ascending order, 55 * with the exception of VHOST_INVALID_FEATURE_BIT, 56 * which should always be the last entry. 57 */ 58 const int vdpa_feature_bits[] = { 59 VIRTIO_F_ANY_LAYOUT, 60 VIRTIO_F_IOMMU_PLATFORM, 61 VIRTIO_F_NOTIFY_ON_EMPTY, 62 VIRTIO_F_RING_PACKED, 63 VIRTIO_F_RING_RESET, 64 VIRTIO_F_VERSION_1, 65 VIRTIO_NET_F_CSUM, 66 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS, 67 VIRTIO_NET_F_CTRL_MAC_ADDR, 68 VIRTIO_NET_F_CTRL_RX, 69 VIRTIO_NET_F_CTRL_RX_EXTRA, 70 VIRTIO_NET_F_CTRL_VLAN, 71 VIRTIO_NET_F_CTRL_VQ, 72 VIRTIO_NET_F_GSO, 73 VIRTIO_NET_F_GUEST_CSUM, 74 VIRTIO_NET_F_GUEST_ECN, 75 VIRTIO_NET_F_GUEST_TSO4, 76 VIRTIO_NET_F_GUEST_TSO6, 77 VIRTIO_NET_F_GUEST_UFO, 78 VIRTIO_NET_F_GUEST_USO4, 79 VIRTIO_NET_F_GUEST_USO6, 80 VIRTIO_NET_F_HASH_REPORT, 81 VIRTIO_NET_F_HOST_ECN, 82 VIRTIO_NET_F_HOST_TSO4, 83 VIRTIO_NET_F_HOST_TSO6, 84 VIRTIO_NET_F_HOST_UFO, 85 VIRTIO_NET_F_HOST_USO, 86 VIRTIO_NET_F_MQ, 87 VIRTIO_NET_F_MRG_RXBUF, 88 VIRTIO_NET_F_MTU, 89 VIRTIO_NET_F_RSS, 90 VIRTIO_NET_F_STATUS, 91 VIRTIO_RING_F_EVENT_IDX, 92 VIRTIO_RING_F_INDIRECT_DESC, 93 94 /* VHOST_INVALID_FEATURE_BIT should always be the last entry */ 95 VHOST_INVALID_FEATURE_BIT 96 }; 97 98 /** Supported device specific feature bits with SVQ */ 99 static const uint64_t vdpa_svq_device_features = 100 BIT_ULL(VIRTIO_NET_F_CSUM) | 101 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | 102 BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) | 103 BIT_ULL(VIRTIO_NET_F_MTU) | 104 BIT_ULL(VIRTIO_NET_F_MAC) | 105 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | 106 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | 107 BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | 108 BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | 109 BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | 110 BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | 111 BIT_ULL(VIRTIO_NET_F_HOST_ECN) | 112 BIT_ULL(VIRTIO_NET_F_HOST_UFO) | 113 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | 114 BIT_ULL(VIRTIO_NET_F_STATUS) | 115 BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | 116 BIT_ULL(VIRTIO_NET_F_CTRL_RX) | 117 BIT_ULL(VIRTIO_NET_F_CTRL_VLAN) | 118 BIT_ULL(VIRTIO_NET_F_CTRL_RX_EXTRA) | 119 BIT_ULL(VIRTIO_NET_F_MQ) | 120 BIT_ULL(VIRTIO_F_ANY_LAYOUT) | 121 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | 122 /* VHOST_F_LOG_ALL is exposed by SVQ */ 123 BIT_ULL(VHOST_F_LOG_ALL) | 124 BIT_ULL(VIRTIO_NET_F_HASH_REPORT) | 125 BIT_ULL(VIRTIO_NET_F_RSS) | 126 BIT_ULL(VIRTIO_NET_F_RSC_EXT) | 127 BIT_ULL(VIRTIO_NET_F_STANDBY) | 128 BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX); 129 130 #define VHOST_VDPA_NET_CVQ_ASID 1 131 132 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) 133 { 134 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 135 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 136 return s->vhost_net; 137 } 138 139 static size_t vhost_vdpa_net_cvq_cmd_len(void) 140 { 141 /* 142 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. 143 * In buffer is always 1 byte, so it should fit here 144 */ 145 return sizeof(struct virtio_net_ctrl_hdr) + 146 2 * sizeof(struct virtio_net_ctrl_mac) + 147 MAC_TABLE_ENTRIES * ETH_ALEN; 148 } 149 150 static size_t vhost_vdpa_net_cvq_cmd_page_len(void) 151 { 152 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); 153 } 154 155 static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp) 156 { 157 uint64_t invalid_dev_features = 158 features & ~vdpa_svq_device_features & 159 /* Transport are all accepted at this point */ 160 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, 161 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); 162 163 if (invalid_dev_features) { 164 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, 165 invalid_dev_features); 166 return false; 167 } 168 169 return vhost_svq_valid_features(features, errp); 170 } 171 172 static int vhost_vdpa_net_check_device_id(struct vhost_net *net) 173 { 174 uint32_t device_id; 175 int ret; 176 struct vhost_dev *hdev; 177 178 hdev = (struct vhost_dev *)&net->dev; 179 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); 180 if (device_id != VIRTIO_ID_NET) { 181 return -ENOTSUP; 182 } 183 return ret; 184 } 185 186 static int vhost_vdpa_add(NetClientState *ncs, void *be, 187 int queue_pair_index, int nvqs) 188 { 189 VhostNetOptions options; 190 struct vhost_net *net = NULL; 191 VhostVDPAState *s; 192 int ret; 193 194 options.backend_type = VHOST_BACKEND_TYPE_VDPA; 195 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 196 s = DO_UPCAST(VhostVDPAState, nc, ncs); 197 options.net_backend = ncs; 198 options.opaque = be; 199 options.busyloop_timeout = 0; 200 options.nvqs = nvqs; 201 202 net = vhost_net_init(&options); 203 if (!net) { 204 error_report("failed to init vhost_net for queue"); 205 goto err_init; 206 } 207 s->vhost_net = net; 208 ret = vhost_vdpa_net_check_device_id(net); 209 if (ret) { 210 goto err_check; 211 } 212 return 0; 213 err_check: 214 vhost_net_cleanup(net); 215 g_free(net); 216 err_init: 217 return -1; 218 } 219 220 static void vhost_vdpa_cleanup(NetClientState *nc) 221 { 222 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 223 224 /* 225 * If a peer NIC is attached, do not cleanup anything. 226 * Cleanup will happen as a part of qemu_cleanup() -> net_cleanup() 227 * when the guest is shutting down. 228 */ 229 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 230 return; 231 } 232 munmap(s->cvq_cmd_out_buffer, vhost_vdpa_net_cvq_cmd_page_len()); 233 munmap(s->status, vhost_vdpa_net_cvq_cmd_page_len()); 234 if (s->vhost_net) { 235 vhost_net_cleanup(s->vhost_net); 236 g_free(s->vhost_net); 237 s->vhost_net = NULL; 238 } 239 if (s->vhost_vdpa.index != 0) { 240 return; 241 } 242 qemu_close(s->vhost_vdpa.shared->device_fd); 243 g_free(s->vhost_vdpa.shared); 244 } 245 246 /** Dummy SetSteeringEBPF to support RSS for vhost-vdpa backend */ 247 static bool vhost_vdpa_set_steering_ebpf(NetClientState *nc, int prog_fd) 248 { 249 return true; 250 } 251 252 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 253 { 254 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 255 256 return true; 257 } 258 259 static bool vhost_vdpa_has_ufo(NetClientState *nc) 260 { 261 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 262 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 263 uint64_t features = 0; 264 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 265 features = vhost_net_get_features(s->vhost_net, features); 266 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 267 268 } 269 270 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, 271 Error **errp) 272 { 273 const char *driver = object_class_get_name(oc); 274 275 if (!g_str_has_prefix(driver, "virtio-net-")) { 276 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 277 return false; 278 } 279 280 return true; 281 } 282 283 /** Dummy receive in case qemu falls back to userland tap networking */ 284 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, 285 size_t size) 286 { 287 return size; 288 } 289 290 static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable) 291 { 292 struct vhost_vdpa *v = &s->vhost_vdpa; 293 VirtIONet *n; 294 VirtIODevice *vdev; 295 int data_queue_pairs, cvq, r; 296 297 /* We are only called on the first data vqs and only if x-svq is not set */ 298 if (s->vhost_vdpa.shadow_vqs_enabled == enable) { 299 return; 300 } 301 302 vdev = v->dev->vdev; 303 n = VIRTIO_NET(vdev); 304 if (!n->vhost_started) { 305 return; 306 } 307 308 data_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 309 cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ? 310 n->max_ncs - n->max_queue_pairs : 0; 311 /* 312 * TODO: vhost_net_stop does suspend, get_base and reset. We can be smarter 313 * in the future and resume the device if read-only operations between 314 * suspend and reset goes wrong. 315 */ 316 vhost_net_stop(vdev, n->nic->ncs, data_queue_pairs, cvq); 317 318 /* Start will check migration setup_or_active to configure or not SVQ */ 319 r = vhost_net_start(vdev, n->nic->ncs, data_queue_pairs, cvq); 320 if (unlikely(r < 0)) { 321 error_report("unable to start vhost net: %s(%d)", g_strerror(-r), -r); 322 } 323 } 324 325 static int vdpa_net_migration_state_notifier(NotifierWithReturn *notifier, 326 MigrationEvent *e, Error **errp) 327 { 328 VhostVDPAState *s = container_of(notifier, VhostVDPAState, migration_state); 329 330 if (e->type == MIG_EVENT_PRECOPY_SETUP) { 331 vhost_vdpa_net_log_global_enable(s, true); 332 } else if (e->type == MIG_EVENT_PRECOPY_FAILED) { 333 vhost_vdpa_net_log_global_enable(s, false); 334 } 335 return 0; 336 } 337 338 static void vhost_vdpa_net_data_start_first(VhostVDPAState *s) 339 { 340 struct vhost_vdpa *v = &s->vhost_vdpa; 341 342 migration_add_notifier(&s->migration_state, 343 vdpa_net_migration_state_notifier); 344 if (v->shadow_vqs_enabled) { 345 v->shared->iova_tree = vhost_iova_tree_new(v->shared->iova_range.first, 346 v->shared->iova_range.last); 347 } 348 } 349 350 static int vhost_vdpa_net_data_start(NetClientState *nc) 351 { 352 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 353 struct vhost_vdpa *v = &s->vhost_vdpa; 354 355 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 356 357 if (s->always_svq || 358 migration_is_setup_or_active(migrate_get_current()->state)) { 359 v->shadow_vqs_enabled = true; 360 } else { 361 v->shadow_vqs_enabled = false; 362 } 363 364 if (v->index == 0) { 365 v->shared->shadow_data = v->shadow_vqs_enabled; 366 vhost_vdpa_net_data_start_first(s); 367 return 0; 368 } 369 370 return 0; 371 } 372 373 static int vhost_vdpa_net_data_load(NetClientState *nc) 374 { 375 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 376 struct vhost_vdpa *v = &s->vhost_vdpa; 377 bool has_cvq = v->dev->vq_index_end % 2; 378 379 if (has_cvq) { 380 return 0; 381 } 382 383 for (int i = 0; i < v->dev->nvqs; ++i) { 384 vhost_vdpa_set_vring_ready(v, i + v->dev->vq_index); 385 } 386 return 0; 387 } 388 389 static void vhost_vdpa_net_client_stop(NetClientState *nc) 390 { 391 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 392 struct vhost_dev *dev; 393 394 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 395 396 if (s->vhost_vdpa.index == 0) { 397 migration_remove_notifier(&s->migration_state); 398 } 399 400 dev = s->vhost_vdpa.dev; 401 if (dev->vq_index + dev->nvqs == dev->vq_index_end) { 402 g_clear_pointer(&s->vhost_vdpa.shared->iova_tree, 403 vhost_iova_tree_delete); 404 } 405 } 406 407 static NetClientInfo net_vhost_vdpa_info = { 408 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 409 .size = sizeof(VhostVDPAState), 410 .receive = vhost_vdpa_receive, 411 .start = vhost_vdpa_net_data_start, 412 .load = vhost_vdpa_net_data_load, 413 .stop = vhost_vdpa_net_client_stop, 414 .cleanup = vhost_vdpa_cleanup, 415 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 416 .has_ufo = vhost_vdpa_has_ufo, 417 .check_peer_type = vhost_vdpa_check_peer_type, 418 .set_steering_ebpf = vhost_vdpa_set_steering_ebpf, 419 }; 420 421 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index, 422 Error **errp) 423 { 424 struct vhost_vring_state state = { 425 .index = vq_index, 426 }; 427 int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state); 428 429 if (unlikely(r < 0)) { 430 r = -errno; 431 error_setg_errno(errp, errno, "Cannot get VQ %u group", vq_index); 432 return r; 433 } 434 435 return state.num; 436 } 437 438 static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, 439 unsigned vq_group, 440 unsigned asid_num) 441 { 442 struct vhost_vring_state asid = { 443 .index = vq_group, 444 .num = asid_num, 445 }; 446 int r; 447 448 r = ioctl(v->shared->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); 449 if (unlikely(r < 0)) { 450 error_report("Can't set vq group %u asid %u, errno=%d (%s)", 451 asid.index, asid.num, errno, g_strerror(errno)); 452 } 453 return r; 454 } 455 456 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) 457 { 458 VhostIOVATree *tree = v->shared->iova_tree; 459 DMAMap needle = { 460 /* 461 * No need to specify size or to look for more translations since 462 * this contiguous chunk was allocated by us. 463 */ 464 .translated_addr = (hwaddr)(uintptr_t)addr, 465 }; 466 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); 467 int r; 468 469 if (unlikely(!map)) { 470 error_report("Cannot locate expected map"); 471 return; 472 } 473 474 r = vhost_vdpa_dma_unmap(v->shared, v->address_space_id, map->iova, 475 map->size + 1); 476 if (unlikely(r != 0)) { 477 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); 478 } 479 480 vhost_iova_tree_remove(tree, *map); 481 } 482 483 /** Map CVQ buffer. */ 484 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, 485 bool write) 486 { 487 DMAMap map = {}; 488 int r; 489 490 map.translated_addr = (hwaddr)(uintptr_t)buf; 491 map.size = size - 1; 492 map.perm = write ? IOMMU_RW : IOMMU_RO, 493 r = vhost_iova_tree_map_alloc(v->shared->iova_tree, &map); 494 if (unlikely(r != IOVA_OK)) { 495 error_report("Cannot map injected element"); 496 return r; 497 } 498 499 r = vhost_vdpa_dma_map(v->shared, v->address_space_id, map.iova, 500 vhost_vdpa_net_cvq_cmd_page_len(), buf, !write); 501 if (unlikely(r < 0)) { 502 goto dma_map_err; 503 } 504 505 return 0; 506 507 dma_map_err: 508 vhost_iova_tree_remove(v->shared->iova_tree, map); 509 return r; 510 } 511 512 static int vhost_vdpa_net_cvq_start(NetClientState *nc) 513 { 514 VhostVDPAState *s; 515 struct vhost_vdpa *v; 516 int64_t cvq_group; 517 int r; 518 Error *err = NULL; 519 520 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 521 522 s = DO_UPCAST(VhostVDPAState, nc, nc); 523 v = &s->vhost_vdpa; 524 525 v->shadow_vqs_enabled = v->shared->shadow_data; 526 s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID; 527 528 if (v->shared->shadow_data) { 529 /* SVQ is already configured for all virtqueues */ 530 goto out; 531 } 532 533 /* 534 * If we early return in these cases SVQ will not be enabled. The migration 535 * will be blocked as long as vhost-vdpa backends will not offer _F_LOG. 536 */ 537 if (!vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) { 538 return 0; 539 } 540 541 if (!s->cvq_isolated) { 542 return 0; 543 } 544 545 cvq_group = vhost_vdpa_get_vring_group(v->shared->device_fd, 546 v->dev->vq_index_end - 1, 547 &err); 548 if (unlikely(cvq_group < 0)) { 549 error_report_err(err); 550 return cvq_group; 551 } 552 553 r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID); 554 if (unlikely(r < 0)) { 555 return r; 556 } 557 558 v->shadow_vqs_enabled = true; 559 s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID; 560 561 out: 562 if (!s->vhost_vdpa.shadow_vqs_enabled) { 563 return 0; 564 } 565 566 /* 567 * If other vhost_vdpa already have an iova_tree, reuse it for simplicity, 568 * whether CVQ shares ASID with guest or not, because: 569 * - Memory listener need access to guest's memory addresses allocated in 570 * the IOVA tree. 571 * - There should be plenty of IOVA address space for both ASID not to 572 * worry about collisions between them. Guest's translations are still 573 * validated with virtio virtqueue_pop so there is no risk for the guest 574 * to access memory that it shouldn't. 575 * 576 * To allocate a iova tree per ASID is doable but it complicates the code 577 * and it is not worth it for the moment. 578 */ 579 if (!v->shared->iova_tree) { 580 v->shared->iova_tree = vhost_iova_tree_new(v->shared->iova_range.first, 581 v->shared->iova_range.last); 582 } 583 584 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, 585 vhost_vdpa_net_cvq_cmd_page_len(), false); 586 if (unlikely(r < 0)) { 587 return r; 588 } 589 590 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status, 591 vhost_vdpa_net_cvq_cmd_page_len(), true); 592 if (unlikely(r < 0)) { 593 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 594 } 595 596 return r; 597 } 598 599 static void vhost_vdpa_net_cvq_stop(NetClientState *nc) 600 { 601 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 602 603 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 604 605 if (s->vhost_vdpa.shadow_vqs_enabled) { 606 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 607 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status); 608 } 609 610 vhost_vdpa_net_client_stop(nc); 611 } 612 613 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, 614 const struct iovec *out_sg, size_t out_num, 615 const struct iovec *in_sg, size_t in_num) 616 { 617 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 618 int r; 619 620 r = vhost_svq_add(svq, out_sg, out_num, in_sg, in_num, NULL); 621 if (unlikely(r != 0)) { 622 if (unlikely(r == -ENOSPC)) { 623 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", 624 __func__); 625 } 626 } 627 628 return r; 629 } 630 631 /* 632 * Convenience wrapper to poll SVQ for multiple control commands. 633 * 634 * Caller should hold the BQL when invoking this function, and should take 635 * the answer before SVQ pulls by itself when BQL is released. 636 */ 637 static ssize_t vhost_vdpa_net_svq_poll(VhostVDPAState *s, size_t cmds_in_flight) 638 { 639 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 640 return vhost_svq_poll(svq, cmds_in_flight); 641 } 642 643 static void vhost_vdpa_net_load_cursor_reset(VhostVDPAState *s, 644 struct iovec *out_cursor, 645 struct iovec *in_cursor) 646 { 647 /* reset the cursor of the output buffer for the device */ 648 out_cursor->iov_base = s->cvq_cmd_out_buffer; 649 out_cursor->iov_len = vhost_vdpa_net_cvq_cmd_page_len(); 650 651 /* reset the cursor of the in buffer for the device */ 652 in_cursor->iov_base = s->status; 653 in_cursor->iov_len = vhost_vdpa_net_cvq_cmd_page_len(); 654 } 655 656 /* 657 * Poll SVQ for multiple pending control commands and check the device's ack. 658 * 659 * Caller should hold the BQL when invoking this function. 660 * 661 * @s: The VhostVDPAState 662 * @len: The length of the pending status shadow buffer 663 */ 664 static ssize_t vhost_vdpa_net_svq_flush(VhostVDPAState *s, size_t len) 665 { 666 /* device uses a one-byte length ack for each control command */ 667 ssize_t dev_written = vhost_vdpa_net_svq_poll(s, len); 668 if (unlikely(dev_written != len)) { 669 return -EIO; 670 } 671 672 /* check the device's ack */ 673 for (int i = 0; i < len; ++i) { 674 if (s->status[i] != VIRTIO_NET_OK) { 675 return -EIO; 676 } 677 } 678 return 0; 679 } 680 681 static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, 682 struct iovec *out_cursor, 683 struct iovec *in_cursor, uint8_t class, 684 uint8_t cmd, const struct iovec *data_sg, 685 size_t data_num) 686 { 687 const struct virtio_net_ctrl_hdr ctrl = { 688 .class = class, 689 .cmd = cmd, 690 }; 691 size_t data_size = iov_size(data_sg, data_num), cmd_size; 692 struct iovec out, in; 693 ssize_t r; 694 unsigned dummy_cursor_iov_cnt; 695 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 696 697 assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl)); 698 cmd_size = sizeof(ctrl) + data_size; 699 if (vhost_svq_available_slots(svq) < 2 || 700 iov_size(out_cursor, 1) < cmd_size) { 701 /* 702 * It is time to flush all pending control commands if SVQ is full 703 * or control commands shadow buffers are full. 704 * 705 * We can poll here since we've had BQL from the time 706 * we sent the descriptor. 707 */ 708 r = vhost_vdpa_net_svq_flush(s, in_cursor->iov_base - 709 (void *)s->status); 710 if (unlikely(r < 0)) { 711 return r; 712 } 713 714 vhost_vdpa_net_load_cursor_reset(s, out_cursor, in_cursor); 715 } 716 717 /* pack the CVQ command header */ 718 iov_from_buf(out_cursor, 1, 0, &ctrl, sizeof(ctrl)); 719 /* pack the CVQ command command-specific-data */ 720 iov_to_buf(data_sg, data_num, 0, 721 out_cursor->iov_base + sizeof(ctrl), data_size); 722 723 /* extract the required buffer from the cursor for output */ 724 iov_copy(&out, 1, out_cursor, 1, 0, cmd_size); 725 /* extract the required buffer from the cursor for input */ 726 iov_copy(&in, 1, in_cursor, 1, 0, sizeof(*s->status)); 727 728 r = vhost_vdpa_net_cvq_add(s, &out, 1, &in, 1); 729 if (unlikely(r < 0)) { 730 return r; 731 } 732 733 /* iterate the cursors */ 734 dummy_cursor_iov_cnt = 1; 735 iov_discard_front(&out_cursor, &dummy_cursor_iov_cnt, cmd_size); 736 dummy_cursor_iov_cnt = 1; 737 iov_discard_front(&in_cursor, &dummy_cursor_iov_cnt, sizeof(*s->status)); 738 739 return 0; 740 } 741 742 static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n, 743 struct iovec *out_cursor, 744 struct iovec *in_cursor) 745 { 746 if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 747 const struct iovec data = { 748 .iov_base = (void *)n->mac, 749 .iov_len = sizeof(n->mac), 750 }; 751 ssize_t r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 752 VIRTIO_NET_CTRL_MAC, 753 VIRTIO_NET_CTRL_MAC_ADDR_SET, 754 &data, 1); 755 if (unlikely(r < 0)) { 756 return r; 757 } 758 } 759 760 /* 761 * According to VirtIO standard, "The device MUST have an 762 * empty MAC filtering table on reset.". 763 * 764 * Therefore, there is no need to send this CVQ command if the 765 * driver also sets an empty MAC filter table, which aligns with 766 * the device's defaults. 767 * 768 * Note that the device's defaults can mismatch the driver's 769 * configuration only at live migration. 770 */ 771 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX) || 772 n->mac_table.in_use == 0) { 773 return 0; 774 } 775 776 uint32_t uni_entries = n->mac_table.first_multi, 777 uni_macs_size = uni_entries * ETH_ALEN, 778 mul_entries = n->mac_table.in_use - uni_entries, 779 mul_macs_size = mul_entries * ETH_ALEN; 780 struct virtio_net_ctrl_mac uni = { 781 .entries = cpu_to_le32(uni_entries), 782 }; 783 struct virtio_net_ctrl_mac mul = { 784 .entries = cpu_to_le32(mul_entries), 785 }; 786 const struct iovec data[] = { 787 { 788 .iov_base = &uni, 789 .iov_len = sizeof(uni), 790 }, { 791 .iov_base = n->mac_table.macs, 792 .iov_len = uni_macs_size, 793 }, { 794 .iov_base = &mul, 795 .iov_len = sizeof(mul), 796 }, { 797 .iov_base = &n->mac_table.macs[uni_macs_size], 798 .iov_len = mul_macs_size, 799 }, 800 }; 801 ssize_t r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 802 VIRTIO_NET_CTRL_MAC, 803 VIRTIO_NET_CTRL_MAC_TABLE_SET, 804 data, ARRAY_SIZE(data)); 805 if (unlikely(r < 0)) { 806 return r; 807 } 808 809 return 0; 810 } 811 812 static int vhost_vdpa_net_load_rss(VhostVDPAState *s, const VirtIONet *n, 813 struct iovec *out_cursor, 814 struct iovec *in_cursor, bool do_rss) 815 { 816 struct virtio_net_rss_config cfg = {}; 817 ssize_t r; 818 g_autofree uint16_t *table = NULL; 819 820 /* 821 * According to VirtIO standard, "Initially the device has all hash 822 * types disabled and reports only VIRTIO_NET_HASH_REPORT_NONE.". 823 * 824 * Therefore, there is no need to send this CVQ command if the 825 * driver disables the all hash types, which aligns with 826 * the device's defaults. 827 * 828 * Note that the device's defaults can mismatch the driver's 829 * configuration only at live migration. 830 */ 831 if (!n->rss_data.enabled || 832 n->rss_data.hash_types == VIRTIO_NET_HASH_REPORT_NONE) { 833 return 0; 834 } 835 836 table = g_malloc_n(n->rss_data.indirections_len, 837 sizeof(n->rss_data.indirections_table[0])); 838 cfg.hash_types = cpu_to_le32(n->rss_data.hash_types); 839 840 if (do_rss) { 841 /* 842 * According to VirtIO standard, "Number of entries in indirection_table 843 * is (indirection_table_mask + 1)". 844 */ 845 cfg.indirection_table_mask = cpu_to_le16(n->rss_data.indirections_len - 846 1); 847 cfg.unclassified_queue = cpu_to_le16(n->rss_data.default_queue); 848 for (int i = 0; i < n->rss_data.indirections_len; ++i) { 849 table[i] = cpu_to_le16(n->rss_data.indirections_table[i]); 850 } 851 cfg.max_tx_vq = cpu_to_le16(n->curr_queue_pairs); 852 } else { 853 /* 854 * According to VirtIO standard, "Field reserved MUST contain zeroes. 855 * It is defined to make the structure to match the layout of 856 * virtio_net_rss_config structure, defined in 5.1.6.5.7.". 857 * 858 * Therefore, we need to zero the fields in 859 * struct virtio_net_rss_config, which corresponds to the 860 * `reserved` field in struct virtio_net_hash_config. 861 * 862 * Note that all other fields are zeroed at their definitions, 863 * except for the `indirection_table` field, where the actual data 864 * is stored in the `table` variable to ensure compatibility 865 * with RSS case. Therefore, we need to zero the `table` variable here. 866 */ 867 table[0] = 0; 868 } 869 870 /* 871 * Considering that virtio_net_handle_rss() currently does not restore 872 * the hash key length parsed from the CVQ command sent from the guest 873 * into n->rss_data and uses the maximum key length in other code, so 874 * we also employ the maximum key length here. 875 */ 876 cfg.hash_key_length = sizeof(n->rss_data.key); 877 878 const struct iovec data[] = { 879 { 880 .iov_base = &cfg, 881 .iov_len = offsetof(struct virtio_net_rss_config, 882 indirection_table), 883 }, { 884 .iov_base = table, 885 .iov_len = n->rss_data.indirections_len * 886 sizeof(n->rss_data.indirections_table[0]), 887 }, { 888 .iov_base = &cfg.max_tx_vq, 889 .iov_len = offsetof(struct virtio_net_rss_config, hash_key_data) - 890 offsetof(struct virtio_net_rss_config, max_tx_vq), 891 }, { 892 .iov_base = (void *)n->rss_data.key, 893 .iov_len = sizeof(n->rss_data.key), 894 } 895 }; 896 897 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 898 VIRTIO_NET_CTRL_MQ, 899 do_rss ? VIRTIO_NET_CTRL_MQ_RSS_CONFIG : 900 VIRTIO_NET_CTRL_MQ_HASH_CONFIG, 901 data, ARRAY_SIZE(data)); 902 if (unlikely(r < 0)) { 903 return r; 904 } 905 906 return 0; 907 } 908 909 static int vhost_vdpa_net_load_mq(VhostVDPAState *s, 910 const VirtIONet *n, 911 struct iovec *out_cursor, 912 struct iovec *in_cursor) 913 { 914 struct virtio_net_ctrl_mq mq; 915 ssize_t r; 916 917 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_MQ)) { 918 return 0; 919 } 920 921 mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs); 922 const struct iovec data = { 923 .iov_base = &mq, 924 .iov_len = sizeof(mq), 925 }; 926 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 927 VIRTIO_NET_CTRL_MQ, 928 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, 929 &data, 1); 930 if (unlikely(r < 0)) { 931 return r; 932 } 933 934 if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_RSS)) { 935 /* load the receive-side scaling state */ 936 r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, true); 937 if (unlikely(r < 0)) { 938 return r; 939 } 940 } else if (virtio_vdev_has_feature(&n->parent_obj, 941 VIRTIO_NET_F_HASH_REPORT)) { 942 /* load the hash calculation state */ 943 r = vhost_vdpa_net_load_rss(s, n, out_cursor, in_cursor, false); 944 if (unlikely(r < 0)) { 945 return r; 946 } 947 } 948 949 return 0; 950 } 951 952 static int vhost_vdpa_net_load_offloads(VhostVDPAState *s, 953 const VirtIONet *n, 954 struct iovec *out_cursor, 955 struct iovec *in_cursor) 956 { 957 uint64_t offloads; 958 ssize_t r; 959 960 if (!virtio_vdev_has_feature(&n->parent_obj, 961 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 962 return 0; 963 } 964 965 if (n->curr_guest_offloads == virtio_net_supported_guest_offloads(n)) { 966 /* 967 * According to VirtIO standard, "Upon feature negotiation 968 * corresponding offload gets enabled to preserve 969 * backward compatibility.". 970 * 971 * Therefore, there is no need to send this CVQ command if the 972 * driver also enables all supported offloads, which aligns with 973 * the device's defaults. 974 * 975 * Note that the device's defaults can mismatch the driver's 976 * configuration only at live migration. 977 */ 978 return 0; 979 } 980 981 offloads = cpu_to_le64(n->curr_guest_offloads); 982 const struct iovec data = { 983 .iov_base = &offloads, 984 .iov_len = sizeof(offloads), 985 }; 986 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 987 VIRTIO_NET_CTRL_GUEST_OFFLOADS, 988 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, 989 &data, 1); 990 if (unlikely(r < 0)) { 991 return r; 992 } 993 994 return 0; 995 } 996 997 static int vhost_vdpa_net_load_rx_mode(VhostVDPAState *s, 998 struct iovec *out_cursor, 999 struct iovec *in_cursor, 1000 uint8_t cmd, 1001 uint8_t on) 1002 { 1003 const struct iovec data = { 1004 .iov_base = &on, 1005 .iov_len = sizeof(on), 1006 }; 1007 ssize_t r; 1008 1009 r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 1010 VIRTIO_NET_CTRL_RX, cmd, &data, 1); 1011 if (unlikely(r < 0)) { 1012 return r; 1013 } 1014 1015 return 0; 1016 } 1017 1018 static int vhost_vdpa_net_load_rx(VhostVDPAState *s, 1019 const VirtIONet *n, 1020 struct iovec *out_cursor, 1021 struct iovec *in_cursor) 1022 { 1023 ssize_t r; 1024 1025 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX)) { 1026 return 0; 1027 } 1028 1029 /* 1030 * According to virtio_net_reset(), device turns promiscuous mode 1031 * on by default. 1032 * 1033 * Additionally, according to VirtIO standard, "Since there are 1034 * no guarantees, it can use a hash filter or silently switch to 1035 * allmulti or promiscuous mode if it is given too many addresses.". 1036 * QEMU marks `n->mac_table.uni_overflow` if guest sets too many 1037 * non-multicast MAC addresses, indicating that promiscuous mode 1038 * should be enabled. 1039 * 1040 * Therefore, QEMU should only send this CVQ command if the 1041 * `n->mac_table.uni_overflow` is not marked and `n->promisc` is off, 1042 * which sets promiscuous mode on, different from the device's defaults. 1043 * 1044 * Note that the device's defaults can mismatch the driver's 1045 * configuration only at live migration. 1046 */ 1047 if (!n->mac_table.uni_overflow && !n->promisc) { 1048 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor, 1049 VIRTIO_NET_CTRL_RX_PROMISC, 0); 1050 if (unlikely(r < 0)) { 1051 return r; 1052 } 1053 } 1054 1055 /* 1056 * According to virtio_net_reset(), device turns all-multicast mode 1057 * off by default. 1058 * 1059 * According to VirtIO standard, "Since there are no guarantees, 1060 * it can use a hash filter or silently switch to allmulti or 1061 * promiscuous mode if it is given too many addresses.". QEMU marks 1062 * `n->mac_table.multi_overflow` if guest sets too many 1063 * non-multicast MAC addresses. 1064 * 1065 * Therefore, QEMU should only send this CVQ command if the 1066 * `n->mac_table.multi_overflow` is marked or `n->allmulti` is on, 1067 * which sets all-multicast mode on, different from the device's defaults. 1068 * 1069 * Note that the device's defaults can mismatch the driver's 1070 * configuration only at live migration. 1071 */ 1072 if (n->mac_table.multi_overflow || n->allmulti) { 1073 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor, 1074 VIRTIO_NET_CTRL_RX_ALLMULTI, 1); 1075 if (unlikely(r < 0)) { 1076 return r; 1077 } 1078 } 1079 1080 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_RX_EXTRA)) { 1081 return 0; 1082 } 1083 1084 /* 1085 * According to virtio_net_reset(), device turns all-unicast mode 1086 * off by default. 1087 * 1088 * Therefore, QEMU should only send this CVQ command if the driver 1089 * sets all-unicast mode on, different from the device's defaults. 1090 * 1091 * Note that the device's defaults can mismatch the driver's 1092 * configuration only at live migration. 1093 */ 1094 if (n->alluni) { 1095 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor, 1096 VIRTIO_NET_CTRL_RX_ALLUNI, 1); 1097 if (r < 0) { 1098 return r; 1099 } 1100 } 1101 1102 /* 1103 * According to virtio_net_reset(), device turns non-multicast mode 1104 * off by default. 1105 * 1106 * Therefore, QEMU should only send this CVQ command if the driver 1107 * sets non-multicast mode on, different from the device's defaults. 1108 * 1109 * Note that the device's defaults can mismatch the driver's 1110 * configuration only at live migration. 1111 */ 1112 if (n->nomulti) { 1113 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor, 1114 VIRTIO_NET_CTRL_RX_NOMULTI, 1); 1115 if (r < 0) { 1116 return r; 1117 } 1118 } 1119 1120 /* 1121 * According to virtio_net_reset(), device turns non-unicast mode 1122 * off by default. 1123 * 1124 * Therefore, QEMU should only send this CVQ command if the driver 1125 * sets non-unicast mode on, different from the device's defaults. 1126 * 1127 * Note that the device's defaults can mismatch the driver's 1128 * configuration only at live migration. 1129 */ 1130 if (n->nouni) { 1131 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor, 1132 VIRTIO_NET_CTRL_RX_NOUNI, 1); 1133 if (r < 0) { 1134 return r; 1135 } 1136 } 1137 1138 /* 1139 * According to virtio_net_reset(), device turns non-broadcast mode 1140 * off by default. 1141 * 1142 * Therefore, QEMU should only send this CVQ command if the driver 1143 * sets non-broadcast mode on, different from the device's defaults. 1144 * 1145 * Note that the device's defaults can mismatch the driver's 1146 * configuration only at live migration. 1147 */ 1148 if (n->nobcast) { 1149 r = vhost_vdpa_net_load_rx_mode(s, out_cursor, in_cursor, 1150 VIRTIO_NET_CTRL_RX_NOBCAST, 1); 1151 if (r < 0) { 1152 return r; 1153 } 1154 } 1155 1156 return 0; 1157 } 1158 1159 static int vhost_vdpa_net_load_single_vlan(VhostVDPAState *s, 1160 const VirtIONet *n, 1161 struct iovec *out_cursor, 1162 struct iovec *in_cursor, 1163 uint16_t vid) 1164 { 1165 const struct iovec data = { 1166 .iov_base = &vid, 1167 .iov_len = sizeof(vid), 1168 }; 1169 ssize_t r = vhost_vdpa_net_load_cmd(s, out_cursor, in_cursor, 1170 VIRTIO_NET_CTRL_VLAN, 1171 VIRTIO_NET_CTRL_VLAN_ADD, 1172 &data, 1); 1173 if (unlikely(r < 0)) { 1174 return r; 1175 } 1176 1177 return 0; 1178 } 1179 1180 static int vhost_vdpa_net_load_vlan(VhostVDPAState *s, 1181 const VirtIONet *n, 1182 struct iovec *out_cursor, 1183 struct iovec *in_cursor) 1184 { 1185 int r; 1186 1187 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_VLAN)) { 1188 return 0; 1189 } 1190 1191 for (int i = 0; i < MAX_VLAN >> 5; i++) { 1192 for (int j = 0; n->vlans[i] && j <= 0x1f; j++) { 1193 if (n->vlans[i] & (1U << j)) { 1194 r = vhost_vdpa_net_load_single_vlan(s, n, out_cursor, 1195 in_cursor, (i << 5) + j); 1196 if (unlikely(r != 0)) { 1197 return r; 1198 } 1199 } 1200 } 1201 } 1202 1203 return 0; 1204 } 1205 1206 static int vhost_vdpa_net_cvq_load(NetClientState *nc) 1207 { 1208 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 1209 struct vhost_vdpa *v = &s->vhost_vdpa; 1210 const VirtIONet *n; 1211 int r; 1212 struct iovec out_cursor, in_cursor; 1213 1214 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 1215 1216 vhost_vdpa_set_vring_ready(v, v->dev->vq_index); 1217 1218 if (v->shadow_vqs_enabled) { 1219 n = VIRTIO_NET(v->dev->vdev); 1220 vhost_vdpa_net_load_cursor_reset(s, &out_cursor, &in_cursor); 1221 r = vhost_vdpa_net_load_mac(s, n, &out_cursor, &in_cursor); 1222 if (unlikely(r < 0)) { 1223 return r; 1224 } 1225 r = vhost_vdpa_net_load_mq(s, n, &out_cursor, &in_cursor); 1226 if (unlikely(r)) { 1227 return r; 1228 } 1229 r = vhost_vdpa_net_load_offloads(s, n, &out_cursor, &in_cursor); 1230 if (unlikely(r)) { 1231 return r; 1232 } 1233 r = vhost_vdpa_net_load_rx(s, n, &out_cursor, &in_cursor); 1234 if (unlikely(r)) { 1235 return r; 1236 } 1237 r = vhost_vdpa_net_load_vlan(s, n, &out_cursor, &in_cursor); 1238 if (unlikely(r)) { 1239 return r; 1240 } 1241 1242 /* 1243 * We need to poll and check all pending device's used buffers. 1244 * 1245 * We can poll here since we've had BQL from the time 1246 * we sent the descriptor. 1247 */ 1248 r = vhost_vdpa_net_svq_flush(s, in_cursor.iov_base - (void *)s->status); 1249 if (unlikely(r)) { 1250 return r; 1251 } 1252 } 1253 1254 for (int i = 0; i < v->dev->vq_index; ++i) { 1255 vhost_vdpa_set_vring_ready(v, i); 1256 } 1257 1258 return 0; 1259 } 1260 1261 static NetClientInfo net_vhost_vdpa_cvq_info = { 1262 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 1263 .size = sizeof(VhostVDPAState), 1264 .receive = vhost_vdpa_receive, 1265 .start = vhost_vdpa_net_cvq_start, 1266 .load = vhost_vdpa_net_cvq_load, 1267 .stop = vhost_vdpa_net_cvq_stop, 1268 .cleanup = vhost_vdpa_cleanup, 1269 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 1270 .has_ufo = vhost_vdpa_has_ufo, 1271 .check_peer_type = vhost_vdpa_check_peer_type, 1272 .set_steering_ebpf = vhost_vdpa_set_steering_ebpf, 1273 }; 1274 1275 /* 1276 * Forward the excessive VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command to 1277 * vdpa device. 1278 * 1279 * Considering that QEMU cannot send the entire filter table to the 1280 * vdpa device, it should send the VIRTIO_NET_CTRL_RX_PROMISC CVQ 1281 * command to enable promiscuous mode to receive all packets, 1282 * according to VirtIO standard, "Since there are no guarantees, 1283 * it can use a hash filter or silently switch to allmulti or 1284 * promiscuous mode if it is given too many addresses.". 1285 * 1286 * Since QEMU ignores MAC addresses beyond `MAC_TABLE_ENTRIES` and 1287 * marks `n->mac_table.x_overflow` accordingly, it should have 1288 * the same effect on the device model to receive 1289 * (`MAC_TABLE_ENTRIES` + 1) or more non-multicast MAC addresses. 1290 * The same applies to multicast MAC addresses. 1291 * 1292 * Therefore, QEMU can provide the device model with a fake 1293 * VIRTIO_NET_CTRL_MAC_TABLE_SET command with (`MAC_TABLE_ENTRIES` + 1) 1294 * non-multicast MAC addresses and (`MAC_TABLE_ENTRIES` + 1) multicast 1295 * MAC addresses. This ensures that the device model marks 1296 * `n->mac_table.uni_overflow` and `n->mac_table.multi_overflow`, 1297 * allowing all packets to be received, which aligns with the 1298 * state of the vdpa device. 1299 */ 1300 static int vhost_vdpa_net_excessive_mac_filter_cvq_add(VhostVDPAState *s, 1301 VirtQueueElement *elem, 1302 struct iovec *out, 1303 const struct iovec *in) 1304 { 1305 struct virtio_net_ctrl_mac mac_data, *mac_ptr; 1306 struct virtio_net_ctrl_hdr *hdr_ptr; 1307 uint32_t cursor; 1308 ssize_t r; 1309 uint8_t on = 1; 1310 1311 /* parse the non-multicast MAC address entries from CVQ command */ 1312 cursor = sizeof(*hdr_ptr); 1313 r = iov_to_buf(elem->out_sg, elem->out_num, cursor, 1314 &mac_data, sizeof(mac_data)); 1315 if (unlikely(r != sizeof(mac_data))) { 1316 /* 1317 * If the CVQ command is invalid, we should simulate the vdpa device 1318 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command 1319 */ 1320 *s->status = VIRTIO_NET_ERR; 1321 return sizeof(*s->status); 1322 } 1323 cursor += sizeof(mac_data) + le32_to_cpu(mac_data.entries) * ETH_ALEN; 1324 1325 /* parse the multicast MAC address entries from CVQ command */ 1326 r = iov_to_buf(elem->out_sg, elem->out_num, cursor, 1327 &mac_data, sizeof(mac_data)); 1328 if (r != sizeof(mac_data)) { 1329 /* 1330 * If the CVQ command is invalid, we should simulate the vdpa device 1331 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command 1332 */ 1333 *s->status = VIRTIO_NET_ERR; 1334 return sizeof(*s->status); 1335 } 1336 cursor += sizeof(mac_data) + le32_to_cpu(mac_data.entries) * ETH_ALEN; 1337 1338 /* validate the CVQ command */ 1339 if (iov_size(elem->out_sg, elem->out_num) != cursor) { 1340 /* 1341 * If the CVQ command is invalid, we should simulate the vdpa device 1342 * to reject the VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command 1343 */ 1344 *s->status = VIRTIO_NET_ERR; 1345 return sizeof(*s->status); 1346 } 1347 1348 /* 1349 * According to VirtIO standard, "Since there are no guarantees, 1350 * it can use a hash filter or silently switch to allmulti or 1351 * promiscuous mode if it is given too many addresses.". 1352 * 1353 * Therefore, considering that QEMU is unable to send the entire 1354 * filter table to the vdpa device, it should send the 1355 * VIRTIO_NET_CTRL_RX_PROMISC CVQ command to enable promiscuous mode 1356 */ 1357 hdr_ptr = out->iov_base; 1358 out->iov_len = sizeof(*hdr_ptr) + sizeof(on); 1359 1360 hdr_ptr->class = VIRTIO_NET_CTRL_RX; 1361 hdr_ptr->cmd = VIRTIO_NET_CTRL_RX_PROMISC; 1362 iov_from_buf(out, 1, sizeof(*hdr_ptr), &on, sizeof(on)); 1363 r = vhost_vdpa_net_cvq_add(s, out, 1, in, 1); 1364 if (unlikely(r < 0)) { 1365 return r; 1366 } 1367 1368 /* 1369 * We can poll here since we've had BQL from the time 1370 * we sent the descriptor. 1371 */ 1372 r = vhost_vdpa_net_svq_poll(s, 1); 1373 if (unlikely(r < sizeof(*s->status))) { 1374 return r; 1375 } 1376 if (*s->status != VIRTIO_NET_OK) { 1377 return sizeof(*s->status); 1378 } 1379 1380 /* 1381 * QEMU should also send a fake VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ 1382 * command to the device model, including (`MAC_TABLE_ENTRIES` + 1) 1383 * non-multicast MAC addresses and (`MAC_TABLE_ENTRIES` + 1) 1384 * multicast MAC addresses. 1385 * 1386 * By doing so, the device model can mark `n->mac_table.uni_overflow` 1387 * and `n->mac_table.multi_overflow`, enabling all packets to be 1388 * received, which aligns with the state of the vdpa device. 1389 */ 1390 cursor = 0; 1391 uint32_t fake_uni_entries = MAC_TABLE_ENTRIES + 1, 1392 fake_mul_entries = MAC_TABLE_ENTRIES + 1, 1393 fake_cvq_size = sizeof(struct virtio_net_ctrl_hdr) + 1394 sizeof(mac_data) + fake_uni_entries * ETH_ALEN + 1395 sizeof(mac_data) + fake_mul_entries * ETH_ALEN; 1396 1397 assert(fake_cvq_size < vhost_vdpa_net_cvq_cmd_page_len()); 1398 out->iov_len = fake_cvq_size; 1399 1400 /* pack the header for fake CVQ command */ 1401 hdr_ptr = out->iov_base + cursor; 1402 hdr_ptr->class = VIRTIO_NET_CTRL_MAC; 1403 hdr_ptr->cmd = VIRTIO_NET_CTRL_MAC_TABLE_SET; 1404 cursor += sizeof(*hdr_ptr); 1405 1406 /* 1407 * Pack the non-multicast MAC addresses part for fake CVQ command. 1408 * 1409 * According to virtio_net_handle_mac(), QEMU doesn't verify the MAC 1410 * addresses provided in CVQ command. Therefore, only the entries 1411 * field need to be prepared in the CVQ command. 1412 */ 1413 mac_ptr = out->iov_base + cursor; 1414 mac_ptr->entries = cpu_to_le32(fake_uni_entries); 1415 cursor += sizeof(*mac_ptr) + fake_uni_entries * ETH_ALEN; 1416 1417 /* 1418 * Pack the multicast MAC addresses part for fake CVQ command. 1419 * 1420 * According to virtio_net_handle_mac(), QEMU doesn't verify the MAC 1421 * addresses provided in CVQ command. Therefore, only the entries 1422 * field need to be prepared in the CVQ command. 1423 */ 1424 mac_ptr = out->iov_base + cursor; 1425 mac_ptr->entries = cpu_to_le32(fake_mul_entries); 1426 1427 /* 1428 * Simulating QEMU poll a vdpa device used buffer 1429 * for VIRTIO_NET_CTRL_MAC_TABLE_SET CVQ command 1430 */ 1431 return sizeof(*s->status); 1432 } 1433 1434 /** 1435 * Validate and copy control virtqueue commands. 1436 * 1437 * Following QEMU guidelines, we offer a copy of the buffers to the device to 1438 * prevent TOCTOU bugs. 1439 */ 1440 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, 1441 VirtQueueElement *elem, 1442 void *opaque) 1443 { 1444 VhostVDPAState *s = opaque; 1445 size_t in_len; 1446 const struct virtio_net_ctrl_hdr *ctrl; 1447 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 1448 /* Out buffer sent to both the vdpa device and the device model */ 1449 struct iovec out = { 1450 .iov_base = s->cvq_cmd_out_buffer, 1451 }; 1452 /* in buffer used for device model */ 1453 const struct iovec model_in = { 1454 .iov_base = &status, 1455 .iov_len = sizeof(status), 1456 }; 1457 /* in buffer used for vdpa device */ 1458 const struct iovec vdpa_in = { 1459 .iov_base = s->status, 1460 .iov_len = sizeof(*s->status), 1461 }; 1462 ssize_t dev_written = -EINVAL; 1463 1464 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, 1465 s->cvq_cmd_out_buffer, 1466 vhost_vdpa_net_cvq_cmd_page_len()); 1467 1468 ctrl = s->cvq_cmd_out_buffer; 1469 if (ctrl->class == VIRTIO_NET_CTRL_ANNOUNCE) { 1470 /* 1471 * Guest announce capability is emulated by qemu, so don't forward to 1472 * the device. 1473 */ 1474 dev_written = sizeof(status); 1475 *s->status = VIRTIO_NET_OK; 1476 } else if (unlikely(ctrl->class == VIRTIO_NET_CTRL_MAC && 1477 ctrl->cmd == VIRTIO_NET_CTRL_MAC_TABLE_SET && 1478 iov_size(elem->out_sg, elem->out_num) > out.iov_len)) { 1479 /* 1480 * Due to the size limitation of the out buffer sent to the vdpa device, 1481 * which is determined by vhost_vdpa_net_cvq_cmd_page_len(), excessive 1482 * MAC addresses set by the driver for the filter table can cause 1483 * truncation of the CVQ command in QEMU. As a result, the vdpa device 1484 * rejects the flawed CVQ command. 1485 * 1486 * Therefore, QEMU must handle this situation instead of sending 1487 * the CVQ command directly. 1488 */ 1489 dev_written = vhost_vdpa_net_excessive_mac_filter_cvq_add(s, elem, 1490 &out, &vdpa_in); 1491 if (unlikely(dev_written < 0)) { 1492 goto out; 1493 } 1494 } else { 1495 ssize_t r; 1496 r = vhost_vdpa_net_cvq_add(s, &out, 1, &vdpa_in, 1); 1497 if (unlikely(r < 0)) { 1498 dev_written = r; 1499 goto out; 1500 } 1501 1502 /* 1503 * We can poll here since we've had BQL from the time 1504 * we sent the descriptor. 1505 */ 1506 dev_written = vhost_vdpa_net_svq_poll(s, 1); 1507 } 1508 1509 if (unlikely(dev_written < sizeof(status))) { 1510 error_report("Insufficient written data (%zu)", dev_written); 1511 goto out; 1512 } 1513 1514 if (*s->status != VIRTIO_NET_OK) { 1515 goto out; 1516 } 1517 1518 status = VIRTIO_NET_ERR; 1519 virtio_net_handle_ctrl_iov(svq->vdev, &model_in, 1, &out, 1); 1520 if (status != VIRTIO_NET_OK) { 1521 error_report("Bad CVQ processing in model"); 1522 } 1523 1524 out: 1525 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, 1526 sizeof(status)); 1527 if (unlikely(in_len < sizeof(status))) { 1528 error_report("Bad device CVQ written length"); 1529 } 1530 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); 1531 /* 1532 * `elem` belongs to vhost_vdpa_net_handle_ctrl_avail() only when 1533 * the function successfully forwards the CVQ command, indicated 1534 * by a non-negative value of `dev_written`. Otherwise, it still 1535 * belongs to SVQ. 1536 * This function should only free the `elem` when it owns. 1537 */ 1538 if (dev_written >= 0) { 1539 g_free(elem); 1540 } 1541 return dev_written < 0 ? dev_written : 0; 1542 } 1543 1544 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { 1545 .avail_handler = vhost_vdpa_net_handle_ctrl_avail, 1546 }; 1547 1548 /** 1549 * Probe if CVQ is isolated 1550 * 1551 * @device_fd The vdpa device fd 1552 * @features Features offered by the device. 1553 * @cvq_index The control vq pair index 1554 * 1555 * Returns <0 in case of failure, 0 if false and 1 if true. 1556 */ 1557 static int vhost_vdpa_probe_cvq_isolation(int device_fd, uint64_t features, 1558 int cvq_index, Error **errp) 1559 { 1560 uint64_t backend_features; 1561 int64_t cvq_group; 1562 uint8_t status = VIRTIO_CONFIG_S_ACKNOWLEDGE | 1563 VIRTIO_CONFIG_S_DRIVER; 1564 int r; 1565 1566 ERRP_GUARD(); 1567 1568 r = ioctl(device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features); 1569 if (unlikely(r < 0)) { 1570 error_setg_errno(errp, errno, "Cannot get vdpa backend_features"); 1571 return r; 1572 } 1573 1574 if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) { 1575 return 0; 1576 } 1577 1578 r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 1579 if (unlikely(r)) { 1580 error_setg_errno(errp, -r, "Cannot set device status"); 1581 goto out; 1582 } 1583 1584 r = ioctl(device_fd, VHOST_SET_FEATURES, &features); 1585 if (unlikely(r)) { 1586 error_setg_errno(errp, -r, "Cannot set features"); 1587 goto out; 1588 } 1589 1590 status |= VIRTIO_CONFIG_S_FEATURES_OK; 1591 r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 1592 if (unlikely(r)) { 1593 error_setg_errno(errp, -r, "Cannot set device status"); 1594 goto out; 1595 } 1596 1597 cvq_group = vhost_vdpa_get_vring_group(device_fd, cvq_index, errp); 1598 if (unlikely(cvq_group < 0)) { 1599 if (cvq_group != -ENOTSUP) { 1600 r = cvq_group; 1601 goto out; 1602 } 1603 1604 /* 1605 * The kernel report VHOST_BACKEND_F_IOTLB_ASID if the vdpa frontend 1606 * support ASID even if the parent driver does not. The CVQ cannot be 1607 * isolated in this case. 1608 */ 1609 error_free(*errp); 1610 *errp = NULL; 1611 r = 0; 1612 goto out; 1613 } 1614 1615 for (int i = 0; i < cvq_index; ++i) { 1616 int64_t group = vhost_vdpa_get_vring_group(device_fd, i, errp); 1617 if (unlikely(group < 0)) { 1618 r = group; 1619 goto out; 1620 } 1621 1622 if (group == (int64_t)cvq_group) { 1623 r = 0; 1624 goto out; 1625 } 1626 } 1627 1628 r = 1; 1629 1630 out: 1631 status = 0; 1632 ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 1633 return r; 1634 } 1635 1636 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 1637 const char *device, 1638 const char *name, 1639 int vdpa_device_fd, 1640 int queue_pair_index, 1641 int nvqs, 1642 bool is_datapath, 1643 bool svq, 1644 struct vhost_vdpa_iova_range iova_range, 1645 uint64_t features, 1646 VhostVDPAShared *shared, 1647 Error **errp) 1648 { 1649 NetClientState *nc = NULL; 1650 VhostVDPAState *s; 1651 int ret = 0; 1652 assert(name); 1653 int cvq_isolated = 0; 1654 1655 if (is_datapath) { 1656 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 1657 name); 1658 } else { 1659 cvq_isolated = vhost_vdpa_probe_cvq_isolation(vdpa_device_fd, features, 1660 queue_pair_index * 2, 1661 errp); 1662 if (unlikely(cvq_isolated < 0)) { 1663 return NULL; 1664 } 1665 1666 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, 1667 device, name); 1668 } 1669 qemu_set_info_str(nc, TYPE_VHOST_VDPA); 1670 s = DO_UPCAST(VhostVDPAState, nc, nc); 1671 1672 s->vhost_vdpa.index = queue_pair_index; 1673 s->always_svq = svq; 1674 s->migration_state.notify = NULL; 1675 s->vhost_vdpa.shadow_vqs_enabled = svq; 1676 if (queue_pair_index == 0) { 1677 vhost_vdpa_net_valid_svq_features(features, 1678 &s->vhost_vdpa.migration_blocker); 1679 s->vhost_vdpa.shared = g_new0(VhostVDPAShared, 1); 1680 s->vhost_vdpa.shared->device_fd = vdpa_device_fd; 1681 s->vhost_vdpa.shared->iova_range = iova_range; 1682 s->vhost_vdpa.shared->shadow_data = svq; 1683 } else if (!is_datapath) { 1684 s->cvq_cmd_out_buffer = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(), 1685 PROT_READ | PROT_WRITE, 1686 MAP_SHARED | MAP_ANONYMOUS, -1, 0); 1687 s->status = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(), 1688 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 1689 -1, 0); 1690 1691 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; 1692 s->vhost_vdpa.shadow_vq_ops_opaque = s; 1693 s->cvq_isolated = cvq_isolated; 1694 } 1695 if (queue_pair_index != 0) { 1696 s->vhost_vdpa.shared = shared; 1697 } 1698 1699 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 1700 if (ret) { 1701 qemu_del_net_client(nc); 1702 return NULL; 1703 } 1704 1705 return nc; 1706 } 1707 1708 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) 1709 { 1710 int ret = ioctl(fd, VHOST_GET_FEATURES, features); 1711 if (unlikely(ret < 0)) { 1712 error_setg_errno(errp, errno, 1713 "Fail to query features from vhost-vDPA device"); 1714 } 1715 return ret; 1716 } 1717 1718 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, 1719 int *has_cvq, Error **errp) 1720 { 1721 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 1722 g_autofree struct vhost_vdpa_config *config = NULL; 1723 __virtio16 *max_queue_pairs; 1724 int ret; 1725 1726 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 1727 *has_cvq = 1; 1728 } else { 1729 *has_cvq = 0; 1730 } 1731 1732 if (features & (1 << VIRTIO_NET_F_MQ)) { 1733 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 1734 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 1735 config->len = sizeof(*max_queue_pairs); 1736 1737 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 1738 if (ret) { 1739 error_setg(errp, "Fail to get config from vhost-vDPA device"); 1740 return -ret; 1741 } 1742 1743 max_queue_pairs = (__virtio16 *)&config->buf; 1744 1745 return lduw_le_p(max_queue_pairs); 1746 } 1747 1748 return 1; 1749 } 1750 1751 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 1752 NetClientState *peer, Error **errp) 1753 { 1754 const NetdevVhostVDPAOptions *opts; 1755 uint64_t features; 1756 int vdpa_device_fd; 1757 g_autofree NetClientState **ncs = NULL; 1758 struct vhost_vdpa_iova_range iova_range; 1759 NetClientState *nc; 1760 int queue_pairs, r, i = 0, has_cvq = 0; 1761 1762 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 1763 opts = &netdev->u.vhost_vdpa; 1764 if (!opts->vhostdev && !opts->vhostfd) { 1765 error_setg(errp, 1766 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); 1767 return -1; 1768 } 1769 1770 if (opts->vhostdev && opts->vhostfd) { 1771 error_setg(errp, 1772 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); 1773 return -1; 1774 } 1775 1776 if (opts->vhostdev) { 1777 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); 1778 if (vdpa_device_fd == -1) { 1779 return -errno; 1780 } 1781 } else { 1782 /* has_vhostfd */ 1783 vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); 1784 if (vdpa_device_fd == -1) { 1785 error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); 1786 return -1; 1787 } 1788 } 1789 1790 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); 1791 if (unlikely(r < 0)) { 1792 goto err; 1793 } 1794 1795 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, 1796 &has_cvq, errp); 1797 if (queue_pairs < 0) { 1798 qemu_close(vdpa_device_fd); 1799 return queue_pairs; 1800 } 1801 1802 r = vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); 1803 if (unlikely(r < 0)) { 1804 error_setg(errp, "vhost-vdpa: get iova range failed: %s", 1805 strerror(-r)); 1806 goto err; 1807 } 1808 1809 if (opts->x_svq && !vhost_vdpa_net_valid_svq_features(features, errp)) { 1810 goto err; 1811 } 1812 1813 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 1814 1815 for (i = 0; i < queue_pairs; i++) { 1816 VhostVDPAShared *shared = NULL; 1817 1818 if (i) { 1819 shared = DO_UPCAST(VhostVDPAState, nc, ncs[0])->vhost_vdpa.shared; 1820 } 1821 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 1822 vdpa_device_fd, i, 2, true, opts->x_svq, 1823 iova_range, features, shared, errp); 1824 if (!ncs[i]) 1825 goto err; 1826 } 1827 1828 if (has_cvq) { 1829 VhostVDPAState *s0 = DO_UPCAST(VhostVDPAState, nc, ncs[0]); 1830 VhostVDPAShared *shared = s0->vhost_vdpa.shared; 1831 1832 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 1833 vdpa_device_fd, i, 1, false, 1834 opts->x_svq, iova_range, features, shared, 1835 errp); 1836 if (!nc) 1837 goto err; 1838 } 1839 1840 return 0; 1841 1842 err: 1843 if (i) { 1844 for (i--; i >= 0; i--) { 1845 qemu_del_net_client(ncs[i]); 1846 } 1847 } 1848 1849 qemu_close(vdpa_device_fd); 1850 1851 return -1; 1852 } 1853