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 Notifier 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_HASH_REPORT, 79 VIRTIO_NET_F_HOST_ECN, 80 VIRTIO_NET_F_HOST_TSO4, 81 VIRTIO_NET_F_HOST_TSO6, 82 VIRTIO_NET_F_HOST_UFO, 83 VIRTIO_NET_F_MQ, 84 VIRTIO_NET_F_MRG_RXBUF, 85 VIRTIO_NET_F_MTU, 86 VIRTIO_NET_F_RSS, 87 VIRTIO_NET_F_STATUS, 88 VIRTIO_RING_F_EVENT_IDX, 89 VIRTIO_RING_F_INDIRECT_DESC, 90 91 /* VHOST_INVALID_FEATURE_BIT should always be the last entry */ 92 VHOST_INVALID_FEATURE_BIT 93 }; 94 95 /** Supported device specific feature bits with SVQ */ 96 static const uint64_t vdpa_svq_device_features = 97 BIT_ULL(VIRTIO_NET_F_CSUM) | 98 BIT_ULL(VIRTIO_NET_F_GUEST_CSUM) | 99 BIT_ULL(VIRTIO_NET_F_CTRL_GUEST_OFFLOADS) | 100 BIT_ULL(VIRTIO_NET_F_MTU) | 101 BIT_ULL(VIRTIO_NET_F_MAC) | 102 BIT_ULL(VIRTIO_NET_F_GUEST_TSO4) | 103 BIT_ULL(VIRTIO_NET_F_GUEST_TSO6) | 104 BIT_ULL(VIRTIO_NET_F_GUEST_ECN) | 105 BIT_ULL(VIRTIO_NET_F_GUEST_UFO) | 106 BIT_ULL(VIRTIO_NET_F_HOST_TSO4) | 107 BIT_ULL(VIRTIO_NET_F_HOST_TSO6) | 108 BIT_ULL(VIRTIO_NET_F_HOST_ECN) | 109 BIT_ULL(VIRTIO_NET_F_HOST_UFO) | 110 BIT_ULL(VIRTIO_NET_F_MRG_RXBUF) | 111 BIT_ULL(VIRTIO_NET_F_STATUS) | 112 BIT_ULL(VIRTIO_NET_F_CTRL_VQ) | 113 BIT_ULL(VIRTIO_NET_F_MQ) | 114 BIT_ULL(VIRTIO_F_ANY_LAYOUT) | 115 BIT_ULL(VIRTIO_NET_F_CTRL_MAC_ADDR) | 116 /* VHOST_F_LOG_ALL is exposed by SVQ */ 117 BIT_ULL(VHOST_F_LOG_ALL) | 118 BIT_ULL(VIRTIO_NET_F_RSC_EXT) | 119 BIT_ULL(VIRTIO_NET_F_STANDBY) | 120 BIT_ULL(VIRTIO_NET_F_SPEED_DUPLEX); 121 122 #define VHOST_VDPA_NET_CVQ_ASID 1 123 124 VHostNetState *vhost_vdpa_get_vhost_net(NetClientState *nc) 125 { 126 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 127 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 128 return s->vhost_net; 129 } 130 131 static size_t vhost_vdpa_net_cvq_cmd_len(void) 132 { 133 /* 134 * MAC_TABLE_SET is the ctrl command that produces the longer out buffer. 135 * In buffer is always 1 byte, so it should fit here 136 */ 137 return sizeof(struct virtio_net_ctrl_hdr) + 138 2 * sizeof(struct virtio_net_ctrl_mac) + 139 MAC_TABLE_ENTRIES * ETH_ALEN; 140 } 141 142 static size_t vhost_vdpa_net_cvq_cmd_page_len(void) 143 { 144 return ROUND_UP(vhost_vdpa_net_cvq_cmd_len(), qemu_real_host_page_size()); 145 } 146 147 static bool vhost_vdpa_net_valid_svq_features(uint64_t features, Error **errp) 148 { 149 uint64_t invalid_dev_features = 150 features & ~vdpa_svq_device_features & 151 /* Transport are all accepted at this point */ 152 ~MAKE_64BIT_MASK(VIRTIO_TRANSPORT_F_START, 153 VIRTIO_TRANSPORT_F_END - VIRTIO_TRANSPORT_F_START); 154 155 if (invalid_dev_features) { 156 error_setg(errp, "vdpa svq does not work with features 0x%" PRIx64, 157 invalid_dev_features); 158 return false; 159 } 160 161 return vhost_svq_valid_features(features, errp); 162 } 163 164 static int vhost_vdpa_net_check_device_id(struct vhost_net *net) 165 { 166 uint32_t device_id; 167 int ret; 168 struct vhost_dev *hdev; 169 170 hdev = (struct vhost_dev *)&net->dev; 171 ret = hdev->vhost_ops->vhost_get_device_id(hdev, &device_id); 172 if (device_id != VIRTIO_ID_NET) { 173 return -ENOTSUP; 174 } 175 return ret; 176 } 177 178 static int vhost_vdpa_add(NetClientState *ncs, void *be, 179 int queue_pair_index, int nvqs) 180 { 181 VhostNetOptions options; 182 struct vhost_net *net = NULL; 183 VhostVDPAState *s; 184 int ret; 185 186 options.backend_type = VHOST_BACKEND_TYPE_VDPA; 187 assert(ncs->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 188 s = DO_UPCAST(VhostVDPAState, nc, ncs); 189 options.net_backend = ncs; 190 options.opaque = be; 191 options.busyloop_timeout = 0; 192 options.nvqs = nvqs; 193 194 net = vhost_net_init(&options); 195 if (!net) { 196 error_report("failed to init vhost_net for queue"); 197 goto err_init; 198 } 199 s->vhost_net = net; 200 ret = vhost_vdpa_net_check_device_id(net); 201 if (ret) { 202 goto err_check; 203 } 204 return 0; 205 err_check: 206 vhost_net_cleanup(net); 207 g_free(net); 208 err_init: 209 return -1; 210 } 211 212 static void vhost_vdpa_cleanup(NetClientState *nc) 213 { 214 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 215 216 /* 217 * If a peer NIC is attached, do not cleanup anything. 218 * Cleanup will happen as a part of qemu_cleanup() -> net_cleanup() 219 * when the guest is shutting down. 220 */ 221 if (nc->peer && nc->peer->info->type == NET_CLIENT_DRIVER_NIC) { 222 return; 223 } 224 munmap(s->cvq_cmd_out_buffer, vhost_vdpa_net_cvq_cmd_page_len()); 225 munmap(s->status, vhost_vdpa_net_cvq_cmd_page_len()); 226 if (s->vhost_net) { 227 vhost_net_cleanup(s->vhost_net); 228 g_free(s->vhost_net); 229 s->vhost_net = NULL; 230 } 231 if (s->vhost_vdpa.device_fd >= 0) { 232 qemu_close(s->vhost_vdpa.device_fd); 233 s->vhost_vdpa.device_fd = -1; 234 } 235 } 236 237 static bool vhost_vdpa_has_vnet_hdr(NetClientState *nc) 238 { 239 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 240 241 return true; 242 } 243 244 static bool vhost_vdpa_has_ufo(NetClientState *nc) 245 { 246 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 247 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 248 uint64_t features = 0; 249 features |= (1ULL << VIRTIO_NET_F_HOST_UFO); 250 features = vhost_net_get_features(s->vhost_net, features); 251 return !!(features & (1ULL << VIRTIO_NET_F_HOST_UFO)); 252 253 } 254 255 static bool vhost_vdpa_check_peer_type(NetClientState *nc, ObjectClass *oc, 256 Error **errp) 257 { 258 const char *driver = object_class_get_name(oc); 259 260 if (!g_str_has_prefix(driver, "virtio-net-")) { 261 error_setg(errp, "vhost-vdpa requires frontend driver virtio-net-*"); 262 return false; 263 } 264 265 return true; 266 } 267 268 /** Dummy receive in case qemu falls back to userland tap networking */ 269 static ssize_t vhost_vdpa_receive(NetClientState *nc, const uint8_t *buf, 270 size_t size) 271 { 272 return size; 273 } 274 275 /** From any vdpa net client, get the netclient of the first queue pair */ 276 static VhostVDPAState *vhost_vdpa_net_first_nc_vdpa(VhostVDPAState *s) 277 { 278 NICState *nic = qemu_get_nic(s->nc.peer); 279 NetClientState *nc0 = qemu_get_peer(nic->ncs, 0); 280 281 return DO_UPCAST(VhostVDPAState, nc, nc0); 282 } 283 284 static void vhost_vdpa_net_log_global_enable(VhostVDPAState *s, bool enable) 285 { 286 struct vhost_vdpa *v = &s->vhost_vdpa; 287 VirtIONet *n; 288 VirtIODevice *vdev; 289 int data_queue_pairs, cvq, r; 290 291 /* We are only called on the first data vqs and only if x-svq is not set */ 292 if (s->vhost_vdpa.shadow_vqs_enabled == enable) { 293 return; 294 } 295 296 vdev = v->dev->vdev; 297 n = VIRTIO_NET(vdev); 298 if (!n->vhost_started) { 299 return; 300 } 301 302 data_queue_pairs = n->multiqueue ? n->max_queue_pairs : 1; 303 cvq = virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ? 304 n->max_ncs - n->max_queue_pairs : 0; 305 /* 306 * TODO: vhost_net_stop does suspend, get_base and reset. We can be smarter 307 * in the future and resume the device if read-only operations between 308 * suspend and reset goes wrong. 309 */ 310 vhost_net_stop(vdev, n->nic->ncs, data_queue_pairs, cvq); 311 312 /* Start will check migration setup_or_active to configure or not SVQ */ 313 r = vhost_net_start(vdev, n->nic->ncs, data_queue_pairs, cvq); 314 if (unlikely(r < 0)) { 315 error_report("unable to start vhost net: %s(%d)", g_strerror(-r), -r); 316 } 317 } 318 319 static void vdpa_net_migration_state_notifier(Notifier *notifier, void *data) 320 { 321 MigrationState *migration = data; 322 VhostVDPAState *s = container_of(notifier, VhostVDPAState, 323 migration_state); 324 325 if (migration_in_setup(migration)) { 326 vhost_vdpa_net_log_global_enable(s, true); 327 } else if (migration_has_failed(migration)) { 328 vhost_vdpa_net_log_global_enable(s, false); 329 } 330 } 331 332 static void vhost_vdpa_net_data_start_first(VhostVDPAState *s) 333 { 334 struct vhost_vdpa *v = &s->vhost_vdpa; 335 336 add_migration_state_change_notifier(&s->migration_state); 337 if (v->shadow_vqs_enabled) { 338 v->iova_tree = vhost_iova_tree_new(v->iova_range.first, 339 v->iova_range.last); 340 } 341 } 342 343 static int vhost_vdpa_net_data_start(NetClientState *nc) 344 { 345 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 346 struct vhost_vdpa *v = &s->vhost_vdpa; 347 348 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 349 350 if (s->always_svq || 351 migration_is_setup_or_active(migrate_get_current()->state)) { 352 v->shadow_vqs_enabled = true; 353 v->shadow_data = true; 354 } else { 355 v->shadow_vqs_enabled = false; 356 v->shadow_data = false; 357 } 358 359 if (v->index == 0) { 360 vhost_vdpa_net_data_start_first(s); 361 return 0; 362 } 363 364 if (v->shadow_vqs_enabled) { 365 VhostVDPAState *s0 = vhost_vdpa_net_first_nc_vdpa(s); 366 v->iova_tree = s0->vhost_vdpa.iova_tree; 367 } 368 369 return 0; 370 } 371 372 static void vhost_vdpa_net_client_stop(NetClientState *nc) 373 { 374 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 375 struct vhost_dev *dev; 376 377 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 378 379 if (s->vhost_vdpa.index == 0) { 380 remove_migration_state_change_notifier(&s->migration_state); 381 } 382 383 dev = s->vhost_vdpa.dev; 384 if (dev->vq_index + dev->nvqs == dev->vq_index_end) { 385 g_clear_pointer(&s->vhost_vdpa.iova_tree, vhost_iova_tree_delete); 386 } 387 } 388 389 static NetClientInfo net_vhost_vdpa_info = { 390 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 391 .size = sizeof(VhostVDPAState), 392 .receive = vhost_vdpa_receive, 393 .start = vhost_vdpa_net_data_start, 394 .stop = vhost_vdpa_net_client_stop, 395 .cleanup = vhost_vdpa_cleanup, 396 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 397 .has_ufo = vhost_vdpa_has_ufo, 398 .check_peer_type = vhost_vdpa_check_peer_type, 399 }; 400 401 static int64_t vhost_vdpa_get_vring_group(int device_fd, unsigned vq_index, 402 Error **errp) 403 { 404 struct vhost_vring_state state = { 405 .index = vq_index, 406 }; 407 int r = ioctl(device_fd, VHOST_VDPA_GET_VRING_GROUP, &state); 408 409 if (unlikely(r < 0)) { 410 r = -errno; 411 error_setg_errno(errp, errno, "Cannot get VQ %u group", vq_index); 412 return r; 413 } 414 415 return state.num; 416 } 417 418 static int vhost_vdpa_set_address_space_id(struct vhost_vdpa *v, 419 unsigned vq_group, 420 unsigned asid_num) 421 { 422 struct vhost_vring_state asid = { 423 .index = vq_group, 424 .num = asid_num, 425 }; 426 int r; 427 428 r = ioctl(v->device_fd, VHOST_VDPA_SET_GROUP_ASID, &asid); 429 if (unlikely(r < 0)) { 430 error_report("Can't set vq group %u asid %u, errno=%d (%s)", 431 asid.index, asid.num, errno, g_strerror(errno)); 432 } 433 return r; 434 } 435 436 static void vhost_vdpa_cvq_unmap_buf(struct vhost_vdpa *v, void *addr) 437 { 438 VhostIOVATree *tree = v->iova_tree; 439 DMAMap needle = { 440 /* 441 * No need to specify size or to look for more translations since 442 * this contiguous chunk was allocated by us. 443 */ 444 .translated_addr = (hwaddr)(uintptr_t)addr, 445 }; 446 const DMAMap *map = vhost_iova_tree_find_iova(tree, &needle); 447 int r; 448 449 if (unlikely(!map)) { 450 error_report("Cannot locate expected map"); 451 return; 452 } 453 454 r = vhost_vdpa_dma_unmap(v, v->address_space_id, map->iova, map->size + 1); 455 if (unlikely(r != 0)) { 456 error_report("Device cannot unmap: %s(%d)", g_strerror(r), r); 457 } 458 459 vhost_iova_tree_remove(tree, *map); 460 } 461 462 /** Map CVQ buffer. */ 463 static int vhost_vdpa_cvq_map_buf(struct vhost_vdpa *v, void *buf, size_t size, 464 bool write) 465 { 466 DMAMap map = {}; 467 int r; 468 469 map.translated_addr = (hwaddr)(uintptr_t)buf; 470 map.size = size - 1; 471 map.perm = write ? IOMMU_RW : IOMMU_RO, 472 r = vhost_iova_tree_map_alloc(v->iova_tree, &map); 473 if (unlikely(r != IOVA_OK)) { 474 error_report("Cannot map injected element"); 475 return r; 476 } 477 478 r = vhost_vdpa_dma_map(v, v->address_space_id, map.iova, 479 vhost_vdpa_net_cvq_cmd_page_len(), buf, !write); 480 if (unlikely(r < 0)) { 481 goto dma_map_err; 482 } 483 484 return 0; 485 486 dma_map_err: 487 vhost_iova_tree_remove(v->iova_tree, map); 488 return r; 489 } 490 491 static int vhost_vdpa_net_cvq_start(NetClientState *nc) 492 { 493 VhostVDPAState *s, *s0; 494 struct vhost_vdpa *v; 495 int64_t cvq_group; 496 int r; 497 Error *err = NULL; 498 499 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 500 501 s = DO_UPCAST(VhostVDPAState, nc, nc); 502 v = &s->vhost_vdpa; 503 504 s0 = vhost_vdpa_net_first_nc_vdpa(s); 505 v->shadow_data = s0->vhost_vdpa.shadow_vqs_enabled; 506 v->shadow_vqs_enabled = s->always_svq; 507 s->vhost_vdpa.address_space_id = VHOST_VDPA_GUEST_PA_ASID; 508 509 if (s->vhost_vdpa.shadow_data) { 510 /* SVQ is already configured for all virtqueues */ 511 goto out; 512 } 513 514 /* 515 * If we early return in these cases SVQ will not be enabled. The migration 516 * will be blocked as long as vhost-vdpa backends will not offer _F_LOG. 517 */ 518 if (!vhost_vdpa_net_valid_svq_features(v->dev->features, NULL)) { 519 return 0; 520 } 521 522 if (!s->cvq_isolated) { 523 return 0; 524 } 525 526 cvq_group = vhost_vdpa_get_vring_group(v->device_fd, 527 v->dev->vq_index_end - 1, 528 &err); 529 if (unlikely(cvq_group < 0)) { 530 error_report_err(err); 531 return cvq_group; 532 } 533 534 r = vhost_vdpa_set_address_space_id(v, cvq_group, VHOST_VDPA_NET_CVQ_ASID); 535 if (unlikely(r < 0)) { 536 return r; 537 } 538 539 v->shadow_vqs_enabled = true; 540 s->vhost_vdpa.address_space_id = VHOST_VDPA_NET_CVQ_ASID; 541 542 out: 543 if (!s->vhost_vdpa.shadow_vqs_enabled) { 544 return 0; 545 } 546 547 if (s0->vhost_vdpa.iova_tree) { 548 /* 549 * SVQ is already configured for all virtqueues. Reuse IOVA tree for 550 * simplicity, whether CVQ shares ASID with guest or not, because: 551 * - Memory listener need access to guest's memory addresses allocated 552 * in the IOVA tree. 553 * - There should be plenty of IOVA address space for both ASID not to 554 * worry about collisions between them. Guest's translations are 555 * still validated with virtio virtqueue_pop so there is no risk for 556 * the guest to access memory that it shouldn't. 557 * 558 * To allocate a iova tree per ASID is doable but it complicates the 559 * code and it is not worth it for the moment. 560 */ 561 v->iova_tree = s0->vhost_vdpa.iova_tree; 562 } else { 563 v->iova_tree = vhost_iova_tree_new(v->iova_range.first, 564 v->iova_range.last); 565 } 566 567 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer, 568 vhost_vdpa_net_cvq_cmd_page_len(), false); 569 if (unlikely(r < 0)) { 570 return r; 571 } 572 573 r = vhost_vdpa_cvq_map_buf(&s->vhost_vdpa, s->status, 574 vhost_vdpa_net_cvq_cmd_page_len(), true); 575 if (unlikely(r < 0)) { 576 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 577 } 578 579 return r; 580 } 581 582 static void vhost_vdpa_net_cvq_stop(NetClientState *nc) 583 { 584 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 585 586 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 587 588 if (s->vhost_vdpa.shadow_vqs_enabled) { 589 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->cvq_cmd_out_buffer); 590 vhost_vdpa_cvq_unmap_buf(&s->vhost_vdpa, s->status); 591 } 592 593 vhost_vdpa_net_client_stop(nc); 594 } 595 596 static ssize_t vhost_vdpa_net_cvq_add(VhostVDPAState *s, size_t out_len, 597 size_t in_len) 598 { 599 /* Buffers for the device */ 600 const struct iovec out = { 601 .iov_base = s->cvq_cmd_out_buffer, 602 .iov_len = out_len, 603 }; 604 const struct iovec in = { 605 .iov_base = s->status, 606 .iov_len = sizeof(virtio_net_ctrl_ack), 607 }; 608 VhostShadowVirtqueue *svq = g_ptr_array_index(s->vhost_vdpa.shadow_vqs, 0); 609 int r; 610 611 r = vhost_svq_add(svq, &out, 1, &in, 1, NULL); 612 if (unlikely(r != 0)) { 613 if (unlikely(r == -ENOSPC)) { 614 qemu_log_mask(LOG_GUEST_ERROR, "%s: No space on device queue\n", 615 __func__); 616 } 617 return r; 618 } 619 620 /* 621 * We can poll here since we've had BQL from the time we sent the 622 * descriptor. Also, we need to take the answer before SVQ pulls by itself, 623 * when BQL is released 624 */ 625 return vhost_svq_poll(svq); 626 } 627 628 static ssize_t vhost_vdpa_net_load_cmd(VhostVDPAState *s, uint8_t class, 629 uint8_t cmd, const void *data, 630 size_t data_size) 631 { 632 const struct virtio_net_ctrl_hdr ctrl = { 633 .class = class, 634 .cmd = cmd, 635 }; 636 637 assert(data_size < vhost_vdpa_net_cvq_cmd_page_len() - sizeof(ctrl)); 638 639 memcpy(s->cvq_cmd_out_buffer, &ctrl, sizeof(ctrl)); 640 memcpy(s->cvq_cmd_out_buffer + sizeof(ctrl), data, data_size); 641 642 return vhost_vdpa_net_cvq_add(s, sizeof(ctrl) + data_size, 643 sizeof(virtio_net_ctrl_ack)); 644 } 645 646 static int vhost_vdpa_net_load_mac(VhostVDPAState *s, const VirtIONet *n) 647 { 648 if (virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_CTRL_MAC_ADDR)) { 649 ssize_t dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MAC, 650 VIRTIO_NET_CTRL_MAC_ADDR_SET, 651 n->mac, sizeof(n->mac)); 652 if (unlikely(dev_written < 0)) { 653 return dev_written; 654 } 655 if (*s->status != VIRTIO_NET_OK) { 656 return -EIO; 657 } 658 } 659 660 return 0; 661 } 662 663 static int vhost_vdpa_net_load_mq(VhostVDPAState *s, 664 const VirtIONet *n) 665 { 666 struct virtio_net_ctrl_mq mq; 667 ssize_t dev_written; 668 669 if (!virtio_vdev_has_feature(&n->parent_obj, VIRTIO_NET_F_MQ)) { 670 return 0; 671 } 672 673 mq.virtqueue_pairs = cpu_to_le16(n->curr_queue_pairs); 674 dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_MQ, 675 VIRTIO_NET_CTRL_MQ_VQ_PAIRS_SET, &mq, 676 sizeof(mq)); 677 if (unlikely(dev_written < 0)) { 678 return dev_written; 679 } 680 681 return *s->status != VIRTIO_NET_OK; 682 } 683 684 static int vhost_vdpa_net_load_offloads(VhostVDPAState *s, 685 const VirtIONet *n) 686 { 687 uint64_t offloads; 688 ssize_t dev_written; 689 690 if (!virtio_vdev_has_feature(&n->parent_obj, 691 VIRTIO_NET_F_CTRL_GUEST_OFFLOADS)) { 692 return 0; 693 } 694 695 if (n->curr_guest_offloads == virtio_net_supported_guest_offloads(n)) { 696 /* 697 * According to VirtIO standard, "Upon feature negotiation 698 * corresponding offload gets enabled to preserve 699 * backward compatibility.". 700 * 701 * Therefore, there is no need to send this CVQ command if the 702 * driver also enables all supported offloads, which aligns with 703 * the device's defaults. 704 * 705 * Note that the device's defaults can mismatch the driver's 706 * configuration only at live migration. 707 */ 708 return 0; 709 } 710 711 offloads = cpu_to_le64(n->curr_guest_offloads); 712 dev_written = vhost_vdpa_net_load_cmd(s, VIRTIO_NET_CTRL_GUEST_OFFLOADS, 713 VIRTIO_NET_CTRL_GUEST_OFFLOADS_SET, 714 &offloads, sizeof(offloads)); 715 if (unlikely(dev_written < 0)) { 716 return dev_written; 717 } 718 719 return *s->status != VIRTIO_NET_OK; 720 } 721 722 static int vhost_vdpa_net_load(NetClientState *nc) 723 { 724 VhostVDPAState *s = DO_UPCAST(VhostVDPAState, nc, nc); 725 struct vhost_vdpa *v = &s->vhost_vdpa; 726 const VirtIONet *n; 727 int r; 728 729 assert(nc->info->type == NET_CLIENT_DRIVER_VHOST_VDPA); 730 731 if (!v->shadow_vqs_enabled) { 732 return 0; 733 } 734 735 n = VIRTIO_NET(v->dev->vdev); 736 r = vhost_vdpa_net_load_mac(s, n); 737 if (unlikely(r < 0)) { 738 return r; 739 } 740 r = vhost_vdpa_net_load_mq(s, n); 741 if (unlikely(r)) { 742 return r; 743 } 744 r = vhost_vdpa_net_load_offloads(s, n); 745 if (unlikely(r)) { 746 return r; 747 } 748 749 return 0; 750 } 751 752 static NetClientInfo net_vhost_vdpa_cvq_info = { 753 .type = NET_CLIENT_DRIVER_VHOST_VDPA, 754 .size = sizeof(VhostVDPAState), 755 .receive = vhost_vdpa_receive, 756 .start = vhost_vdpa_net_cvq_start, 757 .load = vhost_vdpa_net_load, 758 .stop = vhost_vdpa_net_cvq_stop, 759 .cleanup = vhost_vdpa_cleanup, 760 .has_vnet_hdr = vhost_vdpa_has_vnet_hdr, 761 .has_ufo = vhost_vdpa_has_ufo, 762 .check_peer_type = vhost_vdpa_check_peer_type, 763 }; 764 765 /** 766 * Validate and copy control virtqueue commands. 767 * 768 * Following QEMU guidelines, we offer a copy of the buffers to the device to 769 * prevent TOCTOU bugs. 770 */ 771 static int vhost_vdpa_net_handle_ctrl_avail(VhostShadowVirtqueue *svq, 772 VirtQueueElement *elem, 773 void *opaque) 774 { 775 VhostVDPAState *s = opaque; 776 size_t in_len; 777 virtio_net_ctrl_ack status = VIRTIO_NET_ERR; 778 /* Out buffer sent to both the vdpa device and the device model */ 779 struct iovec out = { 780 .iov_base = s->cvq_cmd_out_buffer, 781 }; 782 /* in buffer used for device model */ 783 const struct iovec in = { 784 .iov_base = &status, 785 .iov_len = sizeof(status), 786 }; 787 ssize_t dev_written = -EINVAL; 788 789 out.iov_len = iov_to_buf(elem->out_sg, elem->out_num, 0, 790 s->cvq_cmd_out_buffer, 791 vhost_vdpa_net_cvq_cmd_len()); 792 if (*(uint8_t *)s->cvq_cmd_out_buffer == VIRTIO_NET_CTRL_ANNOUNCE) { 793 /* 794 * Guest announce capability is emulated by qemu, so don't forward to 795 * the device. 796 */ 797 dev_written = sizeof(status); 798 *s->status = VIRTIO_NET_OK; 799 } else { 800 dev_written = vhost_vdpa_net_cvq_add(s, out.iov_len, sizeof(status)); 801 if (unlikely(dev_written < 0)) { 802 goto out; 803 } 804 } 805 806 if (unlikely(dev_written < sizeof(status))) { 807 error_report("Insufficient written data (%zu)", dev_written); 808 goto out; 809 } 810 811 if (*s->status != VIRTIO_NET_OK) { 812 goto out; 813 } 814 815 status = VIRTIO_NET_ERR; 816 virtio_net_handle_ctrl_iov(svq->vdev, &in, 1, &out, 1); 817 if (status != VIRTIO_NET_OK) { 818 error_report("Bad CVQ processing in model"); 819 } 820 821 out: 822 in_len = iov_from_buf(elem->in_sg, elem->in_num, 0, &status, 823 sizeof(status)); 824 if (unlikely(in_len < sizeof(status))) { 825 error_report("Bad device CVQ written length"); 826 } 827 vhost_svq_push_elem(svq, elem, MIN(in_len, sizeof(status))); 828 g_free(elem); 829 return dev_written < 0 ? dev_written : 0; 830 } 831 832 static const VhostShadowVirtqueueOps vhost_vdpa_net_svq_ops = { 833 .avail_handler = vhost_vdpa_net_handle_ctrl_avail, 834 }; 835 836 /** 837 * Probe if CVQ is isolated 838 * 839 * @device_fd The vdpa device fd 840 * @features Features offered by the device. 841 * @cvq_index The control vq pair index 842 * 843 * Returns <0 in case of failure, 0 if false and 1 if true. 844 */ 845 static int vhost_vdpa_probe_cvq_isolation(int device_fd, uint64_t features, 846 int cvq_index, Error **errp) 847 { 848 uint64_t backend_features; 849 int64_t cvq_group; 850 uint8_t status = VIRTIO_CONFIG_S_ACKNOWLEDGE | 851 VIRTIO_CONFIG_S_DRIVER | 852 VIRTIO_CONFIG_S_FEATURES_OK; 853 int r; 854 855 ERRP_GUARD(); 856 857 r = ioctl(device_fd, VHOST_GET_BACKEND_FEATURES, &backend_features); 858 if (unlikely(r < 0)) { 859 error_setg_errno(errp, errno, "Cannot get vdpa backend_features"); 860 return r; 861 } 862 863 if (!(backend_features & BIT_ULL(VHOST_BACKEND_F_IOTLB_ASID))) { 864 return 0; 865 } 866 867 r = ioctl(device_fd, VHOST_SET_FEATURES, &features); 868 if (unlikely(r)) { 869 error_setg_errno(errp, errno, "Cannot set features"); 870 } 871 872 r = ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 873 if (unlikely(r)) { 874 error_setg_errno(errp, -r, "Cannot set device features"); 875 goto out; 876 } 877 878 cvq_group = vhost_vdpa_get_vring_group(device_fd, cvq_index, errp); 879 if (unlikely(cvq_group < 0)) { 880 if (cvq_group != -ENOTSUP) { 881 r = cvq_group; 882 goto out; 883 } 884 885 /* 886 * The kernel report VHOST_BACKEND_F_IOTLB_ASID if the vdpa frontend 887 * support ASID even if the parent driver does not. The CVQ cannot be 888 * isolated in this case. 889 */ 890 error_free(*errp); 891 *errp = NULL; 892 r = 0; 893 goto out; 894 } 895 896 for (int i = 0; i < cvq_index; ++i) { 897 int64_t group = vhost_vdpa_get_vring_group(device_fd, i, errp); 898 if (unlikely(group < 0)) { 899 r = group; 900 goto out; 901 } 902 903 if (group == (int64_t)cvq_group) { 904 r = 0; 905 goto out; 906 } 907 } 908 909 r = 1; 910 911 out: 912 status = 0; 913 ioctl(device_fd, VHOST_VDPA_SET_STATUS, &status); 914 return r; 915 } 916 917 static NetClientState *net_vhost_vdpa_init(NetClientState *peer, 918 const char *device, 919 const char *name, 920 int vdpa_device_fd, 921 int queue_pair_index, 922 int nvqs, 923 bool is_datapath, 924 bool svq, 925 struct vhost_vdpa_iova_range iova_range, 926 uint64_t features, 927 Error **errp) 928 { 929 NetClientState *nc = NULL; 930 VhostVDPAState *s; 931 int ret = 0; 932 assert(name); 933 int cvq_isolated; 934 935 if (is_datapath) { 936 nc = qemu_new_net_client(&net_vhost_vdpa_info, peer, device, 937 name); 938 } else { 939 cvq_isolated = vhost_vdpa_probe_cvq_isolation(vdpa_device_fd, features, 940 queue_pair_index * 2, 941 errp); 942 if (unlikely(cvq_isolated < 0)) { 943 return NULL; 944 } 945 946 nc = qemu_new_net_control_client(&net_vhost_vdpa_cvq_info, peer, 947 device, name); 948 } 949 qemu_set_info_str(nc, TYPE_VHOST_VDPA); 950 s = DO_UPCAST(VhostVDPAState, nc, nc); 951 952 s->vhost_vdpa.device_fd = vdpa_device_fd; 953 s->vhost_vdpa.index = queue_pair_index; 954 s->always_svq = svq; 955 s->migration_state.notify = vdpa_net_migration_state_notifier; 956 s->vhost_vdpa.shadow_vqs_enabled = svq; 957 s->vhost_vdpa.iova_range = iova_range; 958 s->vhost_vdpa.shadow_data = svq; 959 if (queue_pair_index == 0) { 960 vhost_vdpa_net_valid_svq_features(features, 961 &s->vhost_vdpa.migration_blocker); 962 } else if (!is_datapath) { 963 s->cvq_cmd_out_buffer = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(), 964 PROT_READ | PROT_WRITE, 965 MAP_SHARED | MAP_ANONYMOUS, -1, 0); 966 s->status = mmap(NULL, vhost_vdpa_net_cvq_cmd_page_len(), 967 PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, 968 -1, 0); 969 970 s->vhost_vdpa.shadow_vq_ops = &vhost_vdpa_net_svq_ops; 971 s->vhost_vdpa.shadow_vq_ops_opaque = s; 972 s->cvq_isolated = cvq_isolated; 973 974 /* 975 * TODO: We cannot migrate devices with CVQ and no x-svq enabled as 976 * there is no way to set the device state (MAC, MQ, etc) before 977 * starting the datapath. 978 * 979 * Migration blocker ownership now belongs to s->vhost_vdpa. 980 */ 981 if (!svq) { 982 error_setg(&s->vhost_vdpa.migration_blocker, 983 "net vdpa cannot migrate with CVQ feature"); 984 } 985 } 986 ret = vhost_vdpa_add(nc, (void *)&s->vhost_vdpa, queue_pair_index, nvqs); 987 if (ret) { 988 qemu_del_net_client(nc); 989 return NULL; 990 } 991 return nc; 992 } 993 994 static int vhost_vdpa_get_features(int fd, uint64_t *features, Error **errp) 995 { 996 int ret = ioctl(fd, VHOST_GET_FEATURES, features); 997 if (unlikely(ret < 0)) { 998 error_setg_errno(errp, errno, 999 "Fail to query features from vhost-vDPA device"); 1000 } 1001 return ret; 1002 } 1003 1004 static int vhost_vdpa_get_max_queue_pairs(int fd, uint64_t features, 1005 int *has_cvq, Error **errp) 1006 { 1007 unsigned long config_size = offsetof(struct vhost_vdpa_config, buf); 1008 g_autofree struct vhost_vdpa_config *config = NULL; 1009 __virtio16 *max_queue_pairs; 1010 int ret; 1011 1012 if (features & (1 << VIRTIO_NET_F_CTRL_VQ)) { 1013 *has_cvq = 1; 1014 } else { 1015 *has_cvq = 0; 1016 } 1017 1018 if (features & (1 << VIRTIO_NET_F_MQ)) { 1019 config = g_malloc0(config_size + sizeof(*max_queue_pairs)); 1020 config->off = offsetof(struct virtio_net_config, max_virtqueue_pairs); 1021 config->len = sizeof(*max_queue_pairs); 1022 1023 ret = ioctl(fd, VHOST_VDPA_GET_CONFIG, config); 1024 if (ret) { 1025 error_setg(errp, "Fail to get config from vhost-vDPA device"); 1026 return -ret; 1027 } 1028 1029 max_queue_pairs = (__virtio16 *)&config->buf; 1030 1031 return lduw_le_p(max_queue_pairs); 1032 } 1033 1034 return 1; 1035 } 1036 1037 int net_init_vhost_vdpa(const Netdev *netdev, const char *name, 1038 NetClientState *peer, Error **errp) 1039 { 1040 const NetdevVhostVDPAOptions *opts; 1041 uint64_t features; 1042 int vdpa_device_fd; 1043 g_autofree NetClientState **ncs = NULL; 1044 struct vhost_vdpa_iova_range iova_range; 1045 NetClientState *nc; 1046 int queue_pairs, r, i = 0, has_cvq = 0; 1047 1048 assert(netdev->type == NET_CLIENT_DRIVER_VHOST_VDPA); 1049 opts = &netdev->u.vhost_vdpa; 1050 if (!opts->vhostdev && !opts->vhostfd) { 1051 error_setg(errp, 1052 "vhost-vdpa: neither vhostdev= nor vhostfd= was specified"); 1053 return -1; 1054 } 1055 1056 if (opts->vhostdev && opts->vhostfd) { 1057 error_setg(errp, 1058 "vhost-vdpa: vhostdev= and vhostfd= are mutually exclusive"); 1059 return -1; 1060 } 1061 1062 if (opts->vhostdev) { 1063 vdpa_device_fd = qemu_open(opts->vhostdev, O_RDWR, errp); 1064 if (vdpa_device_fd == -1) { 1065 return -errno; 1066 } 1067 } else { 1068 /* has_vhostfd */ 1069 vdpa_device_fd = monitor_fd_param(monitor_cur(), opts->vhostfd, errp); 1070 if (vdpa_device_fd == -1) { 1071 error_prepend(errp, "vhost-vdpa: unable to parse vhostfd: "); 1072 return -1; 1073 } 1074 } 1075 1076 r = vhost_vdpa_get_features(vdpa_device_fd, &features, errp); 1077 if (unlikely(r < 0)) { 1078 goto err; 1079 } 1080 1081 queue_pairs = vhost_vdpa_get_max_queue_pairs(vdpa_device_fd, features, 1082 &has_cvq, errp); 1083 if (queue_pairs < 0) { 1084 qemu_close(vdpa_device_fd); 1085 return queue_pairs; 1086 } 1087 1088 r = vhost_vdpa_get_iova_range(vdpa_device_fd, &iova_range); 1089 if (unlikely(r < 0)) { 1090 error_setg(errp, "vhost-vdpa: get iova range failed: %s", 1091 strerror(-r)); 1092 goto err; 1093 } 1094 1095 if (opts->x_svq && !vhost_vdpa_net_valid_svq_features(features, errp)) { 1096 goto err; 1097 } 1098 1099 ncs = g_malloc0(sizeof(*ncs) * queue_pairs); 1100 1101 for (i = 0; i < queue_pairs; i++) { 1102 ncs[i] = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 1103 vdpa_device_fd, i, 2, true, opts->x_svq, 1104 iova_range, features, errp); 1105 if (!ncs[i]) 1106 goto err; 1107 } 1108 1109 if (has_cvq) { 1110 nc = net_vhost_vdpa_init(peer, TYPE_VHOST_VDPA, name, 1111 vdpa_device_fd, i, 1, false, 1112 opts->x_svq, iova_range, features, errp); 1113 if (!nc) 1114 goto err; 1115 } 1116 1117 return 0; 1118 1119 err: 1120 if (i) { 1121 for (i--; i >= 0; i--) { 1122 qemu_del_net_client(ncs[i]); 1123 } 1124 } 1125 1126 qemu_close(vdpa_device_fd); 1127 1128 return -1; 1129 } 1130