drivers/net/virtio/virtio_user/vhost_vdpa.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2020 Red Hat Inc.
   3  */
   4
   5 #include <sys/ioctl.h>
   6 #include <sys/types.h>
   7 #include <sys/stat.h>
   8 #include <fcntl.h>
   9 #include <unistd.h>
  10
  11 #include <rte_memory.h>
  12
  13 #include "vhost.h"
  14 #include "virtio_user_dev.h"
  15
  16 struct vhost_vdpa_data {
  17         int vhostfd;
  18         uint64_t protocol_features;
  19 };
  20
  21 #define VHOST_VDPA_SUPPORTED_BACKEND_FEATURES           \
  22         (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2   |       \
  23         1ULL << VHOST_BACKEND_F_IOTLB_BATCH)
  24
  25 /* vhost kernel & vdpa ioctls */
  26 #define VHOST_VIRTIO 0xAF
  27 #define VHOST_GET_FEATURES _IOR(VHOST_VIRTIO, 0x00, __u64)
  28 #define VHOST_SET_FEATURES _IOW(VHOST_VIRTIO, 0x00, __u64)
  29 #define VHOST_SET_OWNER _IO(VHOST_VIRTIO, 0x01)
  30 #define VHOST_RESET_OWNER _IO(VHOST_VIRTIO, 0x02)
  31 #define VHOST_SET_LOG_BASE _IOW(VHOST_VIRTIO, 0x04, __u64)
  32 #define VHOST_SET_LOG_FD _IOW(VHOST_VIRTIO, 0x07, int)
  33 #define VHOST_SET_VRING_NUM _IOW(VHOST_VIRTIO, 0x10, struct vhost_vring_state)
  34 #define VHOST_SET_VRING_ADDR _IOW(VHOST_VIRTIO, 0x11, struct vhost_vring_addr)
  35 #define VHOST_SET_VRING_BASE _IOW(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
  36 #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state)
  37 #define VHOST_SET_VRING_KICK _IOW(VHOST_VIRTIO, 0x20, struct vhost_vring_file)
  38 #define VHOST_SET_VRING_CALL _IOW(VHOST_VIRTIO, 0x21, struct vhost_vring_file)
  39 #define VHOST_SET_VRING_ERR _IOW(VHOST_VIRTIO, 0x22, struct vhost_vring_file)
  40 #define VHOST_NET_SET_BACKEND _IOW(VHOST_VIRTIO, 0x30, struct vhost_vring_file)
  41 #define VHOST_VDPA_GET_DEVICE_ID _IOR(VHOST_VIRTIO, 0x70, __u32)
  42 #define VHOST_VDPA_GET_STATUS _IOR(VHOST_VIRTIO, 0x71, __u8)
  43 #define VHOST_VDPA_SET_STATUS _IOW(VHOST_VIRTIO, 0x72, __u8)
  44 #define VHOST_VDPA_GET_CONFIG _IOR(VHOST_VIRTIO, 0x73, struct vhost_vdpa_config)
  45 #define VHOST_VDPA_SET_CONFIG _IOW(VHOST_VIRTIO, 0x74, struct vhost_vdpa_config)
  46 #define VHOST_VDPA_SET_VRING_ENABLE _IOW(VHOST_VIRTIO, 0x75, struct vhost_vring_state)
  47 #define VHOST_SET_BACKEND_FEATURES _IOW(VHOST_VIRTIO, 0x25, __u64)
  48 #define VHOST_GET_BACKEND_FEATURES _IOR(VHOST_VIRTIO, 0x26, __u64)
  49
  50 /* no alignment requirement */
  51 struct vhost_iotlb_msg {
  52         uint64_t iova;
  53         uint64_t size;
  54         uint64_t uaddr;
  55 #define VHOST_ACCESS_RO      0x1
  56 #define VHOST_ACCESS_WO      0x2
  57 #define VHOST_ACCESS_RW      0x3
  58         uint8_t perm;
  59 #define VHOST_IOTLB_MISS           1
  60 #define VHOST_IOTLB_UPDATE         2
  61 #define VHOST_IOTLB_INVALIDATE     3
  62 #define VHOST_IOTLB_ACCESS_FAIL    4
  63 #define VHOST_IOTLB_BATCH_BEGIN    5
  64 #define VHOST_IOTLB_BATCH_END      6
  65         uint8_t type;
  66 };
  67
  68 #define VHOST_IOTLB_MSG_V2 0x2
  69
  70 struct vhost_vdpa_config {
  71         uint32_t off;
  72         uint32_t len;
  73         uint8_t buf[0];
  74 };
  75
  76 struct vhost_msg {
  77         uint32_t type;
  78         uint32_t reserved;
  79         union {
  80                 struct vhost_iotlb_msg iotlb;
  81                 uint8_t padding[64];
  82         };
  83 };
  84
  85
  86 static int
  87 vhost_vdpa_ioctl(int fd, uint64_t request, void *arg)
  88 {
  89         int ret;
  90
  91         ret = ioctl(fd, request, arg);
  92         if (ret) {
  93                 PMD_DRV_LOG(ERR, "Vhost-vDPA ioctl %"PRIu64" failed (%s)",
  94                                 request, strerror(errno));
  95                 return -1;
  96         }
  97
  98         return 0;
  99 }
 100
 101 static int
 102 vhost_vdpa_set_owner(struct virtio_user_dev *dev)
 103 {
 104         struct vhost_vdpa_data *data = dev->backend_data;
 105
 106         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_OWNER, NULL);
 107 }
 108
 109 static int
 110 vhost_vdpa_get_protocol_features(struct virtio_user_dev *dev, uint64_t *features)
 111 {
 112         struct vhost_vdpa_data *data = dev->backend_data;
 113
 114         return vhost_vdpa_ioctl(data->vhostfd, VHOST_GET_BACKEND_FEATURES, features);
 115 }
 116
 117 static int
 118 vhost_vdpa_set_protocol_features(struct virtio_user_dev *dev, uint64_t features)
 119 {
 120         struct vhost_vdpa_data *data = dev->backend_data;
 121
 122         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_BACKEND_FEATURES, &features);
 123 }
 124
 125 static int
 126 vhost_vdpa_get_features(struct virtio_user_dev *dev, uint64_t *features)
 127 {
 128         struct vhost_vdpa_data *data = dev->backend_data;
 129         int ret;
 130
 131         ret = vhost_vdpa_ioctl(data->vhostfd, VHOST_GET_FEATURES, features);
 132         if (ret) {
 133                 PMD_DRV_LOG(ERR, "Failed to get features");
 134                 return -1;
 135         }
 136
 137         /* Multiqueue not supported for now */
 138         *features &= ~(1ULL << VIRTIO_NET_F_MQ);
 139
 140         /* Negotiated vDPA backend features */
 141         ret = vhost_vdpa_get_protocol_features(dev, &data->protocol_features);
 142         if (ret < 0) {
 143                 PMD_DRV_LOG(ERR, "Failed to get backend features");
 144                 return -1;
 145         }
 146
 147         data->protocol_features &= VHOST_VDPA_SUPPORTED_BACKEND_FEATURES;
 148
 149         ret = vhost_vdpa_set_protocol_features(dev, data->protocol_features);
 150         if (ret < 0) {
 151                 PMD_DRV_LOG(ERR, "Failed to set backend features");
 152                 return -1;
 153         }
 154
 155         return 0;
 156 }
 157
 158 static int
 159 vhost_vdpa_set_features(struct virtio_user_dev *dev, uint64_t features)
 160 {
 161         struct vhost_vdpa_data *data = dev->backend_data;
 162
 163         /* WORKAROUND */
 164         features |= 1ULL << VIRTIO_F_IOMMU_PLATFORM;
 165
 166         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_FEATURES, &features);
 167 }
 168
 169 static int
 170 vhost_vdpa_iotlb_batch_begin(struct virtio_user_dev *dev)
 171 {
 172         struct vhost_vdpa_data *data = dev->backend_data;
 173         struct vhost_msg msg = {};
 174
 175         if (!(data->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_BATCH)))
 176                 return 0;
 177
 178         if (!(data->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2))) {
 179                 PMD_DRV_LOG(ERR, "IOTLB_MSG_V2 not supported by the backend.");
 180                 return -1;
 181         }
 182
 183         msg.type = VHOST_IOTLB_MSG_V2;
 184         msg.iotlb.type = VHOST_IOTLB_BATCH_BEGIN;
 185
 186         if (write(data->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
 187                 PMD_DRV_LOG(ERR, "Failed to send IOTLB batch begin (%s)",
 188                                 strerror(errno));
 189                 return -1;
 190         }
 191
 192         return 0;
 193 }
 194
 195 static int
 196 vhost_vdpa_iotlb_batch_end(struct virtio_user_dev *dev)
 197 {
 198         struct vhost_vdpa_data *data = dev->backend_data;
 199         struct vhost_msg msg = {};
 200
 201         if (!(data->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_BATCH)))
 202                 return 0;
 203
 204         if (!(data->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2))) {
 205                 PMD_DRV_LOG(ERR, "IOTLB_MSG_V2 not supported by the backend.");
 206                 return -1;
 207         }
 208
 209         msg.type = VHOST_IOTLB_MSG_V2;
 210         msg.iotlb.type = VHOST_IOTLB_BATCH_END;
 211
 212         if (write(data->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
 213                 PMD_DRV_LOG(ERR, "Failed to send IOTLB batch end (%s)",
 214                                 strerror(errno));
 215                 return -1;
 216         }
 217
 218         return 0;
 219 }
 220
 221 static int
 222 vhost_vdpa_dma_map(struct virtio_user_dev *dev, void *addr,
 223                                   uint64_t iova, size_t len)
 224 {
 225         struct vhost_vdpa_data *data = dev->backend_data;
 226         struct vhost_msg msg = {};
 227
 228         if (!(data->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2))) {
 229                 PMD_DRV_LOG(ERR, "IOTLB_MSG_V2 not supported by the backend.");
 230                 return -1;
 231         }
 232
 233         msg.type = VHOST_IOTLB_MSG_V2;
 234         msg.iotlb.type = VHOST_IOTLB_UPDATE;
 235         msg.iotlb.iova = iova;
 236         msg.iotlb.uaddr = (uint64_t)(uintptr_t)addr;
 237         msg.iotlb.size = len;
 238         msg.iotlb.perm = VHOST_ACCESS_RW;
 239
 240         PMD_DRV_LOG(DEBUG, "%s: iova: 0x%" PRIx64 ", addr: %p, len: 0x%zx",
 241                         __func__, iova, addr, len);
 242
 243         if (write(data->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
 244                 PMD_DRV_LOG(ERR, "Failed to send IOTLB update (%s)",
 245                                 strerror(errno));
 246                 return -1;
 247         }
 248
 249         return 0;
 250 }
 251
 252 static int
 253 vhost_vdpa_dma_unmap(struct virtio_user_dev *dev, __rte_unused void *addr,
 254                                   uint64_t iova, size_t len)
 255 {
 256         struct vhost_vdpa_data *data = dev->backend_data;
 257         struct vhost_msg msg = {};
 258
 259         if (!(data->protocol_features & (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2))) {
 260                 PMD_DRV_LOG(ERR, "IOTLB_MSG_V2 not supported by the backend.");
 261                 return -1;
 262         }
 263
 264         msg.type = VHOST_IOTLB_MSG_V2;
 265         msg.iotlb.type = VHOST_IOTLB_INVALIDATE;
 266         msg.iotlb.iova = iova;
 267         msg.iotlb.size = len;
 268
 269         PMD_DRV_LOG(DEBUG, "%s: iova: 0x%" PRIx64 ", len: 0x%zx",
 270                         __func__, iova, len);
 271
 272         if (write(data->vhostfd, &msg, sizeof(msg)) != sizeof(msg)) {
 273                 PMD_DRV_LOG(ERR, "Failed to send IOTLB invalidate (%s)",
 274                                 strerror(errno));
 275                 return -1;
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int
 282 vhost_vdpa_dma_map_batch(struct virtio_user_dev *dev, void *addr,
 283                                   uint64_t iova, size_t len)
 284 {
 285         int ret;
 286
 287         if (vhost_vdpa_iotlb_batch_begin(dev) < 0)
 288                 return -1;
 289
 290         ret = vhost_vdpa_dma_map(dev, addr, iova, len);
 291
 292         if (vhost_vdpa_iotlb_batch_end(dev) < 0)
 293                 return -1;
 294
 295         return ret;
 296 }
 297
 298 static int
 299 vhost_vdpa_dma_unmap_batch(struct virtio_user_dev *dev, void *addr,
 300                                   uint64_t iova, size_t len)
 301 {
 302         int ret;
 303
 304         if (vhost_vdpa_iotlb_batch_begin(dev) < 0)
 305                 return -1;
 306
 307         ret = vhost_vdpa_dma_unmap(dev, addr, iova, len);
 308
 309         if (vhost_vdpa_iotlb_batch_end(dev) < 0)
 310                 return -1;
 311
 312         return ret;
 313 }
 314
 315 static int
 316 vhost_vdpa_map_contig(const struct rte_memseg_list *msl,
 317                 const struct rte_memseg *ms, size_t len, void *arg)
 318 {
 319         struct virtio_user_dev *dev = arg;
 320
 321         if (msl->external)
 322                 return 0;
 323
 324         return vhost_vdpa_dma_map(dev, ms->addr, ms->iova, len);
 325 }
 326
 327 static int
 328 vhost_vdpa_map(const struct rte_memseg_list *msl, const struct rte_memseg *ms,
 329                 void *arg)
 330 {
 331         struct virtio_user_dev *dev = arg;
 332
 333         /* skip external memory that isn't a heap */
 334         if (msl->external && !msl->heap)
 335                 return 0;
 336
 337         /* skip any segments with invalid IOVA addresses */
 338         if (ms->iova == RTE_BAD_IOVA)
 339                 return 0;
 340
 341         /* if IOVA mode is VA, we've already mapped the internal segments */
 342         if (!msl->external && rte_eal_iova_mode() == RTE_IOVA_VA)
 343                 return 0;
 344
 345         return vhost_vdpa_dma_map(dev, ms->addr, ms->iova, ms->len);
 346 }
 347
 348 static int
 349 vhost_vdpa_set_memory_table(struct virtio_user_dev *dev)
 350 {
 351         int ret;
 352
 353         if (vhost_vdpa_iotlb_batch_begin(dev) < 0)
 354                 return -1;
 355
 356         vhost_vdpa_dma_unmap(dev, NULL, 0, SIZE_MAX);
 357
 358         if (rte_eal_iova_mode() == RTE_IOVA_VA) {
 359                 /* with IOVA as VA mode, we can get away with mapping contiguous
 360                  * chunks rather than going page-by-page.
 361                  */
 362                 ret = rte_memseg_contig_walk_thread_unsafe(
 363                                 vhost_vdpa_map_contig, dev);
 364                 if (ret)
 365                         goto batch_end;
 366                 /* we have to continue the walk because we've skipped the
 367                  * external segments during the config walk.
 368                  */
 369         }
 370         ret = rte_memseg_walk_thread_unsafe(vhost_vdpa_map, dev);
 371
 372 batch_end:
 373         if (vhost_vdpa_iotlb_batch_end(dev) < 0)
 374                 return -1;
 375
 376         return ret;
 377 }
 378
 379 static int
 380 vhost_vdpa_set_vring_enable(struct virtio_user_dev *dev, struct vhost_vring_state *state)
 381 {
 382         struct vhost_vdpa_data *data = dev->backend_data;
 383
 384         return vhost_vdpa_ioctl(data->vhostfd, VHOST_VDPA_SET_VRING_ENABLE, state);
 385 }
 386
 387 static int
 388 vhost_vdpa_set_vring_num(struct virtio_user_dev *dev, struct vhost_vring_state *state)
 389 {
 390         struct vhost_vdpa_data *data = dev->backend_data;
 391
 392         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_VRING_NUM, state);
 393 }
 394
 395 static int
 396 vhost_vdpa_set_vring_base(struct virtio_user_dev *dev, struct vhost_vring_state *state)
 397 {
 398         struct vhost_vdpa_data *data = dev->backend_data;
 399
 400         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_VRING_BASE, state);
 401 }
 402
 403 static int
 404 vhost_vdpa_get_vring_base(struct virtio_user_dev *dev, struct vhost_vring_state *state)
 405 {
 406         struct vhost_vdpa_data *data = dev->backend_data;
 407
 408         return vhost_vdpa_ioctl(data->vhostfd, VHOST_GET_VRING_BASE, state);
 409 }
 410
 411 static int
 412 vhost_vdpa_set_vring_call(struct virtio_user_dev *dev, struct vhost_vring_file *file)
 413 {
 414         struct vhost_vdpa_data *data = dev->backend_data;
 415
 416         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_VRING_CALL, file);
 417 }
 418
 419 static int
 420 vhost_vdpa_set_vring_kick(struct virtio_user_dev *dev, struct vhost_vring_file *file)
 421 {
 422         struct vhost_vdpa_data *data = dev->backend_data;
 423
 424         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_VRING_KICK, file);
 425 }
 426
 427 static int
 428 vhost_vdpa_set_vring_addr(struct virtio_user_dev *dev, struct vhost_vring_addr *addr)
 429 {
 430         struct vhost_vdpa_data *data = dev->backend_data;
 431
 432         return vhost_vdpa_ioctl(data->vhostfd, VHOST_SET_VRING_ADDR, addr);
 433 }
 434
 435 static int
 436 vhost_vdpa_get_status(struct virtio_user_dev *dev, uint8_t *status)
 437 {
 438         struct vhost_vdpa_data *data = dev->backend_data;
 439
 440         return vhost_vdpa_ioctl(data->vhostfd, VHOST_VDPA_GET_STATUS, status);
 441 }
 442
 443 static int
 444 vhost_vdpa_set_status(struct virtio_user_dev *dev, uint8_t status)
 445 {
 446         struct vhost_vdpa_data *data = dev->backend_data;
 447
 448         return vhost_vdpa_ioctl(data->vhostfd, VHOST_VDPA_SET_STATUS, &status);
 449 }
 450
 451 static int
 452 vhost_vdpa_get_config(struct virtio_user_dev *dev, uint8_t *data, uint32_t off, uint32_t len)
 453 {
 454         struct vhost_vdpa_data *vdpa_data = dev->backend_data;
 455         struct vhost_vdpa_config *config;
 456         int ret = 0;
 457
 458         config = malloc(sizeof(*config) + len);
 459         if (!config) {
 460                 PMD_DRV_LOG(ERR, "Failed to allocate vDPA config data");
 461                 return -1;
 462         }
 463
 464         config->off = off;
 465         config->len = len;
 466
 467         ret = vhost_vdpa_ioctl(vdpa_data->vhostfd, VHOST_VDPA_GET_CONFIG, config);
 468         if (ret) {
 469                 PMD_DRV_LOG(ERR, "Failed to get vDPA config (offset 0x%x, len 0x%x)", off, len);
 470                 ret = -1;
 471                 goto out;
 472         }
 473
 474         memcpy(data, config->buf, len);
 475 out:
 476         free(config);
 477
 478         return ret;
 479 }
 480
 481 static int
 482 vhost_vdpa_set_config(struct virtio_user_dev *dev, const uint8_t *data, uint32_t off, uint32_t len)
 483 {
 484         struct vhost_vdpa_data *vdpa_data = dev->backend_data;
 485         struct vhost_vdpa_config *config;
 486         int ret = 0;
 487
 488         config = malloc(sizeof(*config) + len);
 489         if (!config) {
 490                 PMD_DRV_LOG(ERR, "Failed to allocate vDPA config data");
 491                 return -1;
 492         }
 493
 494         config->off = off;
 495         config->len = len;
 496
 497         memcpy(config->buf, data, len);
 498
 499         ret = vhost_vdpa_ioctl(vdpa_data->vhostfd, VHOST_VDPA_SET_CONFIG, config);
 500         if (ret) {
 501                 PMD_DRV_LOG(ERR, "Failed to set vDPA config (offset 0x%x, len 0x%x)", off, len);
 502                 ret = -1;
 503         }
 504
 505         free(config);
 506
 507         return ret;
 508 }
 509
 510 /**
 511  * Set up environment to talk with a vhost vdpa backend.
 512  *
 513  * @return
 514  *   - (-1) if fail to set up;
 515  *   - (>=0) if successful.
 516  */
 517 static int
 518 vhost_vdpa_setup(struct virtio_user_dev *dev)
 519 {
 520         struct vhost_vdpa_data *data;
 521         uint32_t did = (uint32_t)-1;
 522
 523         data = malloc(sizeof(*data));
 524         if (!data) {
 525                 PMD_DRV_LOG(ERR, "(%s) Faidle to allocate backend data", dev->path);
 526                 return -1;
 527         }
 528
 529         data->vhostfd = open(dev->path, O_RDWR);
 530         if (data->vhostfd < 0) {
 531                 PMD_DRV_LOG(ERR, "Failed to open %s: %s\n",
 532                                 dev->path, strerror(errno));
 533                 free(data);
 534                 return -1;
 535         }
 536
 537         if (ioctl(data->vhostfd, VHOST_VDPA_GET_DEVICE_ID, &did) < 0 ||
 538                         did != VIRTIO_ID_NETWORK) {
 539                 PMD_DRV_LOG(ERR, "Invalid vdpa device ID: %u\n", did);
 540                 close(data->vhostfd);
 541                 free(data);
 542                 return -1;
 543         }
 544
 545         dev->backend_data = data;
 546
 547         return 0;
 548 }
 549
 550 static int
 551 vhost_vdpa_destroy(struct virtio_user_dev *dev)
 552 {
 553         struct vhost_vdpa_data *data = dev->backend_data;
 554
 555         if (!data)
 556                 return 0;
 557
 558         close(data->vhostfd);
 559
 560         free(data);
 561         dev->backend_data = NULL;
 562
 563         return 0;
 564 }
 565
 566 static int
 567 vhost_vdpa_enable_queue_pair(struct virtio_user_dev *dev,
 568                                uint16_t pair_idx,
 569                                int enable)
 570 {
 571         int i;
 572
 573         if (dev->qp_enabled[pair_idx] == enable)
 574                 return 0;
 575
 576         for (i = 0; i < 2; ++i) {
 577                 struct vhost_vring_state state = {
 578                         .index = pair_idx * 2 + i,
 579                         .num   = enable,
 580                 };
 581
 582                 if (vhost_vdpa_set_vring_enable(dev, &state))
 583                         return -1;
 584         }
 585
 586         dev->qp_enabled[pair_idx] = enable;
 587
 588         return 0;
 589 }
 590
 591 static int
 592 vhost_vdpa_get_backend_features(uint64_t *features)
 593 {
 594         *features = 0;
 595
 596         return 0;
 597 }
 598
 599 static int
 600 vhost_vdpa_update_link_state(struct virtio_user_dev *dev __rte_unused)
 601 {
 602         /* Nothing to update (for now?) */
 603         return 0;
 604 }
 605
 606 static int
 607 vhost_vdpa_get_intr_fd(struct virtio_user_dev *dev __rte_unused)
 608 {
 609         /* No link state interrupt with Vhost-vDPA */
 610         return -1;
 611 }
 612
 613 struct virtio_user_backend_ops virtio_ops_vdpa = {
 614         .setup = vhost_vdpa_setup,
 615         .destroy = vhost_vdpa_destroy,
 616         .get_backend_features = vhost_vdpa_get_backend_features,
 617         .set_owner = vhost_vdpa_set_owner,
 618         .get_features = vhost_vdpa_get_features,
 619         .set_features = vhost_vdpa_set_features,
 620         .set_memory_table = vhost_vdpa_set_memory_table,
 621         .set_vring_num = vhost_vdpa_set_vring_num,
 622         .set_vring_base = vhost_vdpa_set_vring_base,
 623         .get_vring_base = vhost_vdpa_get_vring_base,
 624         .set_vring_call = vhost_vdpa_set_vring_call,
 625         .set_vring_kick = vhost_vdpa_set_vring_kick,
 626         .set_vring_addr = vhost_vdpa_set_vring_addr,
 627         .get_status = vhost_vdpa_get_status,
 628         .set_status = vhost_vdpa_set_status,
 629         .get_config = vhost_vdpa_get_config,
 630         .set_config = vhost_vdpa_set_config,
 631         .enable_qp = vhost_vdpa_enable_queue_pair,
 632         .dma_map = vhost_vdpa_dma_map_batch,
 633         .dma_unmap = vhost_vdpa_dma_unmap_batch,
 634         .update_link_state = vhost_vdpa_update_link_state,
 635         .get_intr_fd = vhost_vdpa_get_intr_fd,
 636 };