lib/librte_vhost/vhost_user.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2010-2018 Intel Corporation
   3  */
   4
   5 /* Security model
   6  * --------------
   7  * The vhost-user protocol connection is an external interface, so it must be
   8  * robust against invalid inputs.
   9  *
  10  * This is important because the vhost-user master is only one step removed
  11  * from the guest.  Malicious guests that have escaped will then launch further
  12  * attacks from the vhost-user master.
  13  *
  14  * Even in deployments where guests are trusted, a bug in the vhost-user master
  15  * can still cause invalid messages to be sent.  Such messages must not
  16  * compromise the stability of the DPDK application by causing crashes, memory
  17  * corruption, or other problematic behavior.
  18  *
  19  * Do not assume received VhostUserMsg fields contain sensible values!
  20  */
  21
  22 #include <stdint.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <unistd.h>
  27 #include <fcntl.h>
  28 #include <sys/ioctl.h>
  29 #include <sys/mman.h>
  30 #include <sys/types.h>
  31 #include <sys/stat.h>
  32 #include <sys/syscall.h>
  33 #include <assert.h>
  34 #ifdef RTE_LIBRTE_VHOST_NUMA
  35 #include <numaif.h>
  36 #endif
  37 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
  38 #include <linux/userfaultfd.h>
  39 #endif
  40 #ifdef F_ADD_SEALS /* if file sealing is supported, so is memfd */
  41 #include <linux/memfd.h>
  42 #define MEMFD_SUPPORTED
  43 #endif
  44
  45 #include <rte_common.h>
  46 #include <rte_malloc.h>
  47 #include <rte_log.h>
  48
  49 #include "iotlb.h"
  50 #include "vhost.h"
  51 #include "vhost_user.h"
  52
  53 #define VIRTIO_MIN_MTU 68
  54 #define VIRTIO_MAX_MTU 65535
  55
  56 #define INFLIGHT_ALIGNMENT      64
  57 #define INFLIGHT_VERSION        0x1
  58
  59 static const char *vhost_message_str[VHOST_USER_MAX] = {
  60         [VHOST_USER_NONE] = "VHOST_USER_NONE",
  61         [VHOST_USER_GET_FEATURES] = "VHOST_USER_GET_FEATURES",
  62         [VHOST_USER_SET_FEATURES] = "VHOST_USER_SET_FEATURES",
  63         [VHOST_USER_SET_OWNER] = "VHOST_USER_SET_OWNER",
  64         [VHOST_USER_RESET_OWNER] = "VHOST_USER_RESET_OWNER",
  65         [VHOST_USER_SET_MEM_TABLE] = "VHOST_USER_SET_MEM_TABLE",
  66         [VHOST_USER_SET_LOG_BASE] = "VHOST_USER_SET_LOG_BASE",
  67         [VHOST_USER_SET_LOG_FD] = "VHOST_USER_SET_LOG_FD",
  68         [VHOST_USER_SET_VRING_NUM] = "VHOST_USER_SET_VRING_NUM",
  69         [VHOST_USER_SET_VRING_ADDR] = "VHOST_USER_SET_VRING_ADDR",
  70         [VHOST_USER_SET_VRING_BASE] = "VHOST_USER_SET_VRING_BASE",
  71         [VHOST_USER_GET_VRING_BASE] = "VHOST_USER_GET_VRING_BASE",
  72         [VHOST_USER_SET_VRING_KICK] = "VHOST_USER_SET_VRING_KICK",
  73         [VHOST_USER_SET_VRING_CALL] = "VHOST_USER_SET_VRING_CALL",
  74         [VHOST_USER_SET_VRING_ERR]  = "VHOST_USER_SET_VRING_ERR",
  75         [VHOST_USER_GET_PROTOCOL_FEATURES]  = "VHOST_USER_GET_PROTOCOL_FEATURES",
  76         [VHOST_USER_SET_PROTOCOL_FEATURES]  = "VHOST_USER_SET_PROTOCOL_FEATURES",
  77         [VHOST_USER_GET_QUEUE_NUM]  = "VHOST_USER_GET_QUEUE_NUM",
  78         [VHOST_USER_SET_VRING_ENABLE]  = "VHOST_USER_SET_VRING_ENABLE",
  79         [VHOST_USER_SEND_RARP]  = "VHOST_USER_SEND_RARP",
  80         [VHOST_USER_NET_SET_MTU]  = "VHOST_USER_NET_SET_MTU",
  81         [VHOST_USER_SET_SLAVE_REQ_FD]  = "VHOST_USER_SET_SLAVE_REQ_FD",
  82         [VHOST_USER_IOTLB_MSG]  = "VHOST_USER_IOTLB_MSG",
  83         [VHOST_USER_CRYPTO_CREATE_SESS] = "VHOST_USER_CRYPTO_CREATE_SESS",
  84         [VHOST_USER_CRYPTO_CLOSE_SESS] = "VHOST_USER_CRYPTO_CLOSE_SESS",
  85         [VHOST_USER_POSTCOPY_ADVISE]  = "VHOST_USER_POSTCOPY_ADVISE",
  86         [VHOST_USER_POSTCOPY_LISTEN]  = "VHOST_USER_POSTCOPY_LISTEN",
  87         [VHOST_USER_POSTCOPY_END]  = "VHOST_USER_POSTCOPY_END",
  88         [VHOST_USER_GET_INFLIGHT_FD] = "VHOST_USER_GET_INFLIGHT_FD",
  89         [VHOST_USER_SET_INFLIGHT_FD] = "VHOST_USER_SET_INFLIGHT_FD",
  90 };
  91
  92 static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg);
  93 static int read_vhost_message(int sockfd, struct VhostUserMsg *msg);
  94
  95 static void
  96 close_msg_fds(struct VhostUserMsg *msg)
  97 {
  98         int i;
  99
 100         for (i = 0; i < msg->fd_num; i++)
 101                 close(msg->fds[i]);
 102 }
 103
 104 /*
 105  * Ensure the expected number of FDs is received,
 106  * close all FDs and return an error if this is not the case.
 107  */
 108 static int
 109 validate_msg_fds(struct VhostUserMsg *msg, int expected_fds)
 110 {
 111         if (msg->fd_num == expected_fds)
 112                 return 0;
 113
 114         VHOST_LOG_CONFIG(ERR,
 115                 " Expect %d FDs for request %s, received %d\n",
 116                 expected_fds,
 117                 vhost_message_str[msg->request.master],
 118                 msg->fd_num);
 119
 120         close_msg_fds(msg);
 121
 122         return -1;
 123 }
 124
 125 static uint64_t
 126 get_blk_size(int fd)
 127 {
 128         struct stat stat;
 129         int ret;
 130
 131         ret = fstat(fd, &stat);
 132         return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize;
 133 }
 134
 135 /*
 136  * Reclaim all the outstanding zmbufs for a virtqueue.
 137  */
 138 static void
 139 drain_zmbuf_list(struct vhost_virtqueue *vq)
 140 {
 141         struct zcopy_mbuf *zmbuf, *next;
 142
 143         for (zmbuf = TAILQ_FIRST(&vq->zmbuf_list);
 144              zmbuf != NULL; zmbuf = next) {
 145                 next = TAILQ_NEXT(zmbuf, next);
 146
 147                 while (!mbuf_is_consumed(zmbuf->mbuf))
 148                         usleep(1000);
 149
 150                 TAILQ_REMOVE(&vq->zmbuf_list, zmbuf, next);
 151                 restore_mbuf(zmbuf->mbuf);
 152                 rte_pktmbuf_free(zmbuf->mbuf);
 153                 put_zmbuf(zmbuf);
 154                 vq->nr_zmbuf -= 1;
 155         }
 156 }
 157
 158 static void
 159 free_mem_region(struct virtio_net *dev)
 160 {
 161         uint32_t i;
 162         struct rte_vhost_mem_region *reg;
 163         struct vhost_virtqueue *vq;
 164
 165         if (!dev || !dev->mem)
 166                 return;
 167
 168         if (dev->dequeue_zero_copy) {
 169                 for (i = 0; i < dev->nr_vring; i++) {
 170                         vq = dev->virtqueue[i];
 171                         if (vq)
 172                                 drain_zmbuf_list(vq);
 173                 }
 174         }
 175
 176         for (i = 0; i < dev->mem->nregions; i++) {
 177                 reg = &dev->mem->regions[i];
 178                 if (reg->host_user_addr) {
 179                         munmap(reg->mmap_addr, reg->mmap_size);
 180                         close(reg->fd);
 181                 }
 182         }
 183 }
 184
 185 void
 186 vhost_backend_cleanup(struct virtio_net *dev)
 187 {
 188         if (dev->mem) {
 189                 free_mem_region(dev);
 190                 rte_free(dev->mem);
 191                 dev->mem = NULL;
 192         }
 193
 194         rte_free(dev->guest_pages);
 195         dev->guest_pages = NULL;
 196
 197         if (dev->log_addr) {
 198                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
 199                 dev->log_addr = 0;
 200         }
 201
 202         if (dev->inflight_info) {
 203                 if (dev->inflight_info->addr) {
 204                         munmap(dev->inflight_info->addr,
 205                                dev->inflight_info->size);
 206                         dev->inflight_info->addr = NULL;
 207                 }
 208
 209                 if (dev->inflight_info->fd >= 0) {
 210                         close(dev->inflight_info->fd);
 211                         dev->inflight_info->fd = -1;
 212                 }
 213
 214                 free(dev->inflight_info);
 215                 dev->inflight_info = NULL;
 216         }
 217
 218         if (dev->slave_req_fd >= 0) {
 219                 close(dev->slave_req_fd);
 220                 dev->slave_req_fd = -1;
 221         }
 222
 223         if (dev->postcopy_ufd >= 0) {
 224                 close(dev->postcopy_ufd);
 225                 dev->postcopy_ufd = -1;
 226         }
 227
 228         dev->postcopy_listening = 0;
 229 }
 230
 231 static void
 232 vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index,
 233                               int enable)
 234 {
 235         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
 236
 237         if (vdpa_dev && vdpa_dev->ops->set_vring_state)
 238                 vdpa_dev->ops->set_vring_state(dev->vid, index, enable);
 239
 240         if (dev->notify_ops->vring_state_changed)
 241                 dev->notify_ops->vring_state_changed(dev->vid,
 242                                 index, enable);
 243 }
 244
 245 /*
 246  * This function just returns success at the moment unless
 247  * the device hasn't been initialised.
 248  */
 249 static int
 250 vhost_user_set_owner(struct virtio_net **pdev __rte_unused,
 251                         struct VhostUserMsg *msg,
 252                         int main_fd __rte_unused)
 253 {
 254         if (validate_msg_fds(msg, 0) != 0)
 255                 return RTE_VHOST_MSG_RESULT_ERR;
 256
 257         return RTE_VHOST_MSG_RESULT_OK;
 258 }
 259
 260 static int
 261 vhost_user_reset_owner(struct virtio_net **pdev,
 262                         struct VhostUserMsg *msg,
 263                         int main_fd __rte_unused)
 264 {
 265         struct virtio_net *dev = *pdev;
 266
 267         if (validate_msg_fds(msg, 0) != 0)
 268                 return RTE_VHOST_MSG_RESULT_ERR;
 269
 270         vhost_destroy_device_notify(dev);
 271
 272         cleanup_device(dev, 0);
 273         reset_device(dev);
 274         return RTE_VHOST_MSG_RESULT_OK;
 275 }
 276
 277 /*
 278  * The features that we support are requested.
 279  */
 280 static int
 281 vhost_user_get_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
 282                         int main_fd __rte_unused)
 283 {
 284         struct virtio_net *dev = *pdev;
 285         uint64_t features = 0;
 286
 287         if (validate_msg_fds(msg, 0) != 0)
 288                 return RTE_VHOST_MSG_RESULT_ERR;
 289
 290         rte_vhost_driver_get_features(dev->ifname, &features);
 291
 292         msg->payload.u64 = features;
 293         msg->size = sizeof(msg->payload.u64);
 294         msg->fd_num = 0;
 295
 296         return RTE_VHOST_MSG_RESULT_REPLY;
 297 }
 298
 299 /*
 300  * The queue number that we support are requested.
 301  */
 302 static int
 303 vhost_user_get_queue_num(struct virtio_net **pdev, struct VhostUserMsg *msg,
 304                         int main_fd __rte_unused)
 305 {
 306         struct virtio_net *dev = *pdev;
 307         uint32_t queue_num = 0;
 308
 309         if (validate_msg_fds(msg, 0) != 0)
 310                 return RTE_VHOST_MSG_RESULT_ERR;
 311
 312         rte_vhost_driver_get_queue_num(dev->ifname, &queue_num);
 313
 314         msg->payload.u64 = (uint64_t)queue_num;
 315         msg->size = sizeof(msg->payload.u64);
 316         msg->fd_num = 0;
 317
 318         return RTE_VHOST_MSG_RESULT_REPLY;
 319 }
 320
 321 /*
 322  * We receive the negotiated features supported by us and the virtio device.
 323  */
 324 static int
 325 vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
 326                         int main_fd __rte_unused)
 327 {
 328         struct virtio_net *dev = *pdev;
 329         uint64_t features = msg->payload.u64;
 330         uint64_t vhost_features = 0;
 331         struct rte_vdpa_device *vdpa_dev;
 332
 333         if (validate_msg_fds(msg, 0) != 0)
 334                 return RTE_VHOST_MSG_RESULT_ERR;
 335
 336         rte_vhost_driver_get_features(dev->ifname, &vhost_features);
 337         if (features & ~vhost_features) {
 338                 VHOST_LOG_CONFIG(ERR,
 339                         "(%d) received invalid negotiated features.\n",
 340                         dev->vid);
 341                 return RTE_VHOST_MSG_RESULT_ERR;
 342         }
 343
 344         if (dev->flags & VIRTIO_DEV_RUNNING) {
 345                 if (dev->features == features)
 346                         return RTE_VHOST_MSG_RESULT_OK;
 347
 348                 /*
 349                  * Error out if master tries to change features while device is
 350                  * in running state. The exception being VHOST_F_LOG_ALL, which
 351                  * is enabled when the live-migration starts.
 352                  */
 353                 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) {
 354                         VHOST_LOG_CONFIG(ERR,
 355                                 "(%d) features changed while device is running.\n",
 356                                 dev->vid);
 357                         return RTE_VHOST_MSG_RESULT_ERR;
 358                 }
 359
 360                 if (dev->notify_ops->features_changed)
 361                         dev->notify_ops->features_changed(dev->vid, features);
 362         }
 363
 364         dev->features = features;
 365         if (dev->features &
 366                 ((1 << VIRTIO_NET_F_MRG_RXBUF) | (1ULL << VIRTIO_F_VERSION_1))) {
 367                 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf);
 368         } else {
 369                 dev->vhost_hlen = sizeof(struct virtio_net_hdr);
 370         }
 371         VHOST_LOG_CONFIG(INFO,
 372                 "negotiated Virtio features: 0x%" PRIx64 "\n", dev->features);
 373         VHOST_LOG_CONFIG(DEBUG,
 374                 "(%d) mergeable RX buffers %s, virtio 1 %s\n",
 375                 dev->vid,
 376                 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off",
 377                 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off");
 378
 379         if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) &&
 380             !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) {
 381                 /*
 382                  * Remove all but first queue pair if MQ hasn't been
 383                  * negotiated. This is safe because the device is not
 384                  * running at this stage.
 385                  */
 386                 while (dev->nr_vring > 2) {
 387                         struct vhost_virtqueue *vq;
 388
 389                         vq = dev->virtqueue[--dev->nr_vring];
 390                         if (!vq)
 391                                 continue;
 392
 393                         dev->virtqueue[dev->nr_vring] = NULL;
 394                         cleanup_vq(vq, 1);
 395                         cleanup_vq_inflight(dev, vq);
 396                         free_vq(dev, vq);
 397                 }
 398         }
 399
 400         vdpa_dev = dev->vdpa_dev;
 401         if (vdpa_dev && vdpa_dev->ops->set_features)
 402                 vdpa_dev->ops->set_features(dev->vid);
 403
 404         return RTE_VHOST_MSG_RESULT_OK;
 405 }
 406
 407 /*
 408  * The virtio device sends us the size of the descriptor ring.
 409  */
 410 static int
 411 vhost_user_set_vring_num(struct virtio_net **pdev,
 412                         struct VhostUserMsg *msg,
 413                         int main_fd __rte_unused)
 414 {
 415         struct virtio_net *dev = *pdev;
 416         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 417
 418         if (validate_msg_fds(msg, 0) != 0)
 419                 return RTE_VHOST_MSG_RESULT_ERR;
 420
 421         vq->size = msg->payload.state.num;
 422
 423         /* VIRTIO 1.0, 2.4 Virtqueues says:
 424          *
 425          *   Queue Size value is always a power of 2. The maximum Queue Size
 426          *   value is 32768.
 427          *
 428          * VIRTIO 1.1 2.7 Virtqueues says:
 429          *
 430          *   Packed virtqueues support up to 2^15 entries each.
 431          */
 432         if (!vq_is_packed(dev)) {
 433                 if (vq->size & (vq->size - 1)) {
 434                         VHOST_LOG_CONFIG(ERR,
 435                                 "invalid virtqueue size %u\n", vq->size);
 436                         return RTE_VHOST_MSG_RESULT_ERR;
 437                 }
 438         }
 439
 440         if (vq->size > 32768) {
 441                 VHOST_LOG_CONFIG(ERR,
 442                         "invalid virtqueue size %u\n", vq->size);
 443                 return RTE_VHOST_MSG_RESULT_ERR;
 444         }
 445
 446         if (dev->dequeue_zero_copy) {
 447                 vq->nr_zmbuf = 0;
 448                 vq->last_zmbuf_idx = 0;
 449                 vq->zmbuf_size = vq->size;
 450                 if (vq->zmbufs)
 451                         rte_free(vq->zmbufs);
 452                 vq->zmbufs = rte_zmalloc(NULL, vq->zmbuf_size *
 453                                          sizeof(struct zcopy_mbuf), 0);
 454                 if (vq->zmbufs == NULL) {
 455                         VHOST_LOG_CONFIG(WARNING,
 456                                 "failed to allocate mem for zero copy; "
 457                                 "zero copy is force disabled\n");
 458                         dev->dequeue_zero_copy = 0;
 459                 }
 460                 TAILQ_INIT(&vq->zmbuf_list);
 461         }
 462
 463         if (vq_is_packed(dev)) {
 464                 if (vq->shadow_used_packed)
 465                         rte_free(vq->shadow_used_packed);
 466                 vq->shadow_used_packed = rte_malloc(NULL,
 467                                 vq->size *
 468                                 sizeof(struct vring_used_elem_packed),
 469                                 RTE_CACHE_LINE_SIZE);
 470                 if (!vq->shadow_used_packed) {
 471                         VHOST_LOG_CONFIG(ERR,
 472                                         "failed to allocate memory for shadow used ring.\n");
 473                         return RTE_VHOST_MSG_RESULT_ERR;
 474                 }
 475
 476         } else {
 477                 if (vq->shadow_used_split)
 478                         rte_free(vq->shadow_used_split);
 479                 vq->shadow_used_split = rte_malloc(NULL,
 480                                 vq->size * sizeof(struct vring_used_elem),
 481                                 RTE_CACHE_LINE_SIZE);
 482                 if (!vq->shadow_used_split) {
 483                         VHOST_LOG_CONFIG(ERR,
 484                                         "failed to allocate memory for shadow used ring.\n");
 485                         return RTE_VHOST_MSG_RESULT_ERR;
 486                 }
 487         }
 488
 489         if (vq->batch_copy_elems)
 490                 rte_free(vq->batch_copy_elems);
 491         vq->batch_copy_elems = rte_malloc(NULL,
 492                                 vq->size * sizeof(struct batch_copy_elem),
 493                                 RTE_CACHE_LINE_SIZE);
 494         if (!vq->batch_copy_elems) {
 495                 VHOST_LOG_CONFIG(ERR,
 496                         "failed to allocate memory for batching copy.\n");
 497                 return RTE_VHOST_MSG_RESULT_ERR;
 498         }
 499
 500         return RTE_VHOST_MSG_RESULT_OK;
 501 }
 502
 503 /*
 504  * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the
 505  * same numa node as the memory of vring descriptor.
 506  */
 507 #ifdef RTE_LIBRTE_VHOST_NUMA
 508 static struct virtio_net*
 509 numa_realloc(struct virtio_net *dev, int index)
 510 {
 511         int oldnode, newnode;
 512         struct virtio_net *old_dev;
 513         struct vhost_virtqueue *old_vq, *vq;
 514         struct zcopy_mbuf *new_zmbuf;
 515         struct vring_used_elem *new_shadow_used_split;
 516         struct vring_used_elem_packed *new_shadow_used_packed;
 517         struct batch_copy_elem *new_batch_copy_elems;
 518         int ret;
 519
 520         if (dev->flags & VIRTIO_DEV_RUNNING)
 521                 return dev;
 522
 523         old_dev = dev;
 524         vq = old_vq = dev->virtqueue[index];
 525
 526         ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc,
 527                             MPOL_F_NODE | MPOL_F_ADDR);
 528
 529         /* check if we need to reallocate vq */
 530         ret |= get_mempolicy(&oldnode, NULL, 0, old_vq,
 531                              MPOL_F_NODE | MPOL_F_ADDR);
 532         if (ret) {
 533                 VHOST_LOG_CONFIG(ERR,
 534                         "Unable to get vq numa information.\n");
 535                 return dev;
 536         }
 537         if (oldnode != newnode) {
 538                 VHOST_LOG_CONFIG(INFO,
 539                         "reallocate vq from %d to %d node\n", oldnode, newnode);
 540                 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode);
 541                 if (!vq)
 542                         return dev;
 543
 544                 memcpy(vq, old_vq, sizeof(*vq));
 545                 TAILQ_INIT(&vq->zmbuf_list);
 546
 547                 if (dev->dequeue_zero_copy) {
 548                         new_zmbuf = rte_malloc_socket(NULL, vq->zmbuf_size *
 549                                         sizeof(struct zcopy_mbuf), 0, newnode);
 550                         if (new_zmbuf) {
 551                                 rte_free(vq->zmbufs);
 552                                 vq->zmbufs = new_zmbuf;
 553                         }
 554                 }
 555
 556                 if (vq_is_packed(dev)) {
 557                         new_shadow_used_packed = rte_malloc_socket(NULL,
 558                                         vq->size *
 559                                         sizeof(struct vring_used_elem_packed),
 560                                         RTE_CACHE_LINE_SIZE,
 561                                         newnode);
 562                         if (new_shadow_used_packed) {
 563                                 rte_free(vq->shadow_used_packed);
 564                                 vq->shadow_used_packed = new_shadow_used_packed;
 565                         }
 566                 } else {
 567                         new_shadow_used_split = rte_malloc_socket(NULL,
 568                                         vq->size *
 569                                         sizeof(struct vring_used_elem),
 570                                         RTE_CACHE_LINE_SIZE,
 571                                         newnode);
 572                         if (new_shadow_used_split) {
 573                                 rte_free(vq->shadow_used_split);
 574                                 vq->shadow_used_split = new_shadow_used_split;
 575                         }
 576                 }
 577
 578                 new_batch_copy_elems = rte_malloc_socket(NULL,
 579                         vq->size * sizeof(struct batch_copy_elem),
 580                         RTE_CACHE_LINE_SIZE,
 581                         newnode);
 582                 if (new_batch_copy_elems) {
 583                         rte_free(vq->batch_copy_elems);
 584                         vq->batch_copy_elems = new_batch_copy_elems;
 585                 }
 586
 587                 rte_free(old_vq);
 588         }
 589
 590         /* check if we need to reallocate dev */
 591         ret = get_mempolicy(&oldnode, NULL, 0, old_dev,
 592                             MPOL_F_NODE | MPOL_F_ADDR);
 593         if (ret) {
 594                 VHOST_LOG_CONFIG(ERR,
 595                         "Unable to get dev numa information.\n");
 596                 goto out;
 597         }
 598         if (oldnode != newnode) {
 599                 VHOST_LOG_CONFIG(INFO,
 600                         "reallocate dev from %d to %d node\n",
 601                         oldnode, newnode);
 602                 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode);
 603                 if (!dev) {
 604                         dev = old_dev;
 605                         goto out;
 606                 }
 607
 608                 memcpy(dev, old_dev, sizeof(*dev));
 609                 rte_free(old_dev);
 610         }
 611
 612 out:
 613         dev->virtqueue[index] = vq;
 614         vhost_devices[dev->vid] = dev;
 615
 616         if (old_vq != vq)
 617                 vhost_user_iotlb_init(dev, index);
 618
 619         return dev;
 620 }
 621 #else
 622 static struct virtio_net*
 623 numa_realloc(struct virtio_net *dev, int index __rte_unused)
 624 {
 625         return dev;
 626 }
 627 #endif
 628
 629 /* Converts QEMU virtual address to Vhost virtual address. */
 630 static uint64_t
 631 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len)
 632 {
 633         struct rte_vhost_mem_region *r;
 634         uint32_t i;
 635
 636         if (unlikely(!dev || !dev->mem))
 637                 goto out_error;
 638
 639         /* Find the region where the address lives. */
 640         for (i = 0; i < dev->mem->nregions; i++) {
 641                 r = &dev->mem->regions[i];
 642
 643                 if (qva >= r->guest_user_addr &&
 644                     qva <  r->guest_user_addr + r->size) {
 645
 646                         if (unlikely(*len > r->guest_user_addr + r->size - qva))
 647                                 *len = r->guest_user_addr + r->size - qva;
 648
 649                         return qva - r->guest_user_addr +
 650                                r->host_user_addr;
 651                 }
 652         }
 653 out_error:
 654         *len = 0;
 655
 656         return 0;
 657 }
 658
 659
 660 /*
 661  * Converts ring address to Vhost virtual address.
 662  * If IOMMU is enabled, the ring address is a guest IO virtual address,
 663  * else it is a QEMU virtual address.
 664  */
 665 static uint64_t
 666 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq,
 667                 uint64_t ra, uint64_t *size)
 668 {
 669         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) {
 670                 uint64_t vva;
 671
 672                 vhost_user_iotlb_rd_lock(vq);
 673                 vva = vhost_iova_to_vva(dev, vq, ra,
 674                                         size, VHOST_ACCESS_RW);
 675                 vhost_user_iotlb_rd_unlock(vq);
 676
 677                 return vva;
 678         }
 679
 680         return qva_to_vva(dev, ra, size);
 681 }
 682
 683 static uint64_t
 684 log_addr_to_gpa(struct virtio_net *dev, struct vhost_virtqueue *vq)
 685 {
 686         uint64_t log_gpa;
 687
 688         vhost_user_iotlb_rd_lock(vq);
 689         log_gpa = translate_log_addr(dev, vq, vq->ring_addrs.log_guest_addr);
 690         vhost_user_iotlb_rd_unlock(vq);
 691
 692         return log_gpa;
 693 }
 694
 695 static struct virtio_net *
 696 translate_ring_addresses(struct virtio_net *dev, int vq_index)
 697 {
 698         struct vhost_virtqueue *vq = dev->virtqueue[vq_index];
 699         struct vhost_vring_addr *addr = &vq->ring_addrs;
 700         uint64_t len, expected_len;
 701
 702         if (addr->flags & (1 << VHOST_VRING_F_LOG)) {
 703                 vq->log_guest_addr =
 704                         log_addr_to_gpa(dev, vq);
 705                 if (vq->log_guest_addr == 0) {
 706                         VHOST_LOG_CONFIG(DEBUG,
 707                                 "(%d) failed to map log_guest_addr.\n",
 708                                 dev->vid);
 709                         return dev;
 710                 }
 711         }
 712
 713         if (vq_is_packed(dev)) {
 714                 len = sizeof(struct vring_packed_desc) * vq->size;
 715                 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t)
 716                         ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len);
 717                 if (vq->desc_packed == NULL ||
 718                                 len != sizeof(struct vring_packed_desc) *
 719                                 vq->size) {
 720                         VHOST_LOG_CONFIG(DEBUG,
 721                                 "(%d) failed to map desc_packed ring.\n",
 722                                 dev->vid);
 723                         return dev;
 724                 }
 725
 726                 dev = numa_realloc(dev, vq_index);
 727                 vq = dev->virtqueue[vq_index];
 728                 addr = &vq->ring_addrs;
 729
 730                 len = sizeof(struct vring_packed_desc_event);
 731                 vq->driver_event = (struct vring_packed_desc_event *)
 732                                         (uintptr_t)ring_addr_to_vva(dev,
 733                                         vq, addr->avail_user_addr, &len);
 734                 if (vq->driver_event == NULL ||
 735                                 len != sizeof(struct vring_packed_desc_event)) {
 736                         VHOST_LOG_CONFIG(DEBUG,
 737                                 "(%d) failed to find driver area address.\n",
 738                                 dev->vid);
 739                         return dev;
 740                 }
 741
 742                 len = sizeof(struct vring_packed_desc_event);
 743                 vq->device_event = (struct vring_packed_desc_event *)
 744                                         (uintptr_t)ring_addr_to_vva(dev,
 745                                         vq, addr->used_user_addr, &len);
 746                 if (vq->device_event == NULL ||
 747                                 len != sizeof(struct vring_packed_desc_event)) {
 748                         VHOST_LOG_CONFIG(DEBUG,
 749                                 "(%d) failed to find device area address.\n",
 750                                 dev->vid);
 751                         return dev;
 752                 }
 753
 754                 vq->access_ok = 1;
 755                 return dev;
 756         }
 757
 758         /* The addresses are converted from QEMU virtual to Vhost virtual. */
 759         if (vq->desc && vq->avail && vq->used)
 760                 return dev;
 761
 762         len = sizeof(struct vring_desc) * vq->size;
 763         vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev,
 764                         vq, addr->desc_user_addr, &len);
 765         if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) {
 766                 VHOST_LOG_CONFIG(DEBUG,
 767                         "(%d) failed to map desc ring.\n",
 768                         dev->vid);
 769                 return dev;
 770         }
 771
 772         dev = numa_realloc(dev, vq_index);
 773         vq = dev->virtqueue[vq_index];
 774         addr = &vq->ring_addrs;
 775
 776         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
 777         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 778                 len += sizeof(uint16_t);
 779         expected_len = len;
 780         vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev,
 781                         vq, addr->avail_user_addr, &len);
 782         if (vq->avail == 0 || len != expected_len) {
 783                 VHOST_LOG_CONFIG(DEBUG,
 784                         "(%d) failed to map avail ring.\n",
 785                         dev->vid);
 786                 return dev;
 787         }
 788
 789         len = sizeof(struct vring_used) +
 790                 sizeof(struct vring_used_elem) * vq->size;
 791         if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX))
 792                 len += sizeof(uint16_t);
 793         expected_len = len;
 794         vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev,
 795                         vq, addr->used_user_addr, &len);
 796         if (vq->used == 0 || len != expected_len) {
 797                 VHOST_LOG_CONFIG(DEBUG,
 798                         "(%d) failed to map used ring.\n",
 799                         dev->vid);
 800                 return dev;
 801         }
 802
 803         if (vq->last_used_idx != vq->used->idx) {
 804                 VHOST_LOG_CONFIG(WARNING,
 805                         "last_used_idx (%u) and vq->used->idx (%u) mismatches; "
 806                         "some packets maybe resent for Tx and dropped for Rx\n",
 807                         vq->last_used_idx, vq->used->idx);
 808                 vq->last_used_idx  = vq->used->idx;
 809                 vq->last_avail_idx = vq->used->idx;
 810         }
 811
 812         vq->access_ok = 1;
 813
 814         VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address desc: %p\n",
 815                         dev->vid, vq->desc);
 816         VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address avail: %p\n",
 817                         dev->vid, vq->avail);
 818         VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address used: %p\n",
 819                         dev->vid, vq->used);
 820         VHOST_LOG_CONFIG(DEBUG, "(%d) log_guest_addr: %" PRIx64 "\n",
 821                         dev->vid, vq->log_guest_addr);
 822
 823         return dev;
 824 }
 825
 826 /*
 827  * The virtio device sends us the desc, used and avail ring addresses.
 828  * This function then converts these to our address space.
 829  */
 830 static int
 831 vhost_user_set_vring_addr(struct virtio_net **pdev, struct VhostUserMsg *msg,
 832                         int main_fd __rte_unused)
 833 {
 834         struct virtio_net *dev = *pdev;
 835         struct vhost_virtqueue *vq;
 836         struct vhost_vring_addr *addr = &msg->payload.addr;
 837         bool access_ok;
 838
 839         if (validate_msg_fds(msg, 0) != 0)
 840                 return RTE_VHOST_MSG_RESULT_ERR;
 841
 842         if (dev->mem == NULL)
 843                 return RTE_VHOST_MSG_RESULT_ERR;
 844
 845         /* addr->index refers to the queue index. The txq 1, rxq is 0. */
 846         vq = dev->virtqueue[msg->payload.addr.index];
 847
 848         access_ok = vq->access_ok;
 849
 850         /*
 851          * Rings addresses should not be interpreted as long as the ring is not
 852          * started and enabled
 853          */
 854         memcpy(&vq->ring_addrs, addr, sizeof(*addr));
 855
 856         vring_invalidate(dev, vq);
 857
 858         if ((vq->enabled && (dev->features &
 859                                 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) ||
 860                         access_ok) {
 861                 dev = translate_ring_addresses(dev, msg->payload.addr.index);
 862                 if (!dev)
 863                         return RTE_VHOST_MSG_RESULT_ERR;
 864
 865                 *pdev = dev;
 866         }
 867
 868         return RTE_VHOST_MSG_RESULT_OK;
 869 }
 870
 871 /*
 872  * The virtio device sends us the available ring last used index.
 873  */
 874 static int
 875 vhost_user_set_vring_base(struct virtio_net **pdev,
 876                         struct VhostUserMsg *msg,
 877                         int main_fd __rte_unused)
 878 {
 879         struct virtio_net *dev = *pdev;
 880         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
 881         uint64_t val = msg->payload.state.num;
 882
 883         if (validate_msg_fds(msg, 0) != 0)
 884                 return RTE_VHOST_MSG_RESULT_ERR;
 885
 886         if (vq_is_packed(dev)) {
 887                 /*
 888                  * Bit[0:14]: avail index
 889                  * Bit[15]: avail wrap counter
 890                  */
 891                 vq->last_avail_idx = val & 0x7fff;
 892                 vq->avail_wrap_counter = !!(val & (0x1 << 15));
 893                 /*
 894                  * Set used index to same value as available one, as
 895                  * their values should be the same since ring processing
 896                  * was stopped at get time.
 897                  */
 898                 vq->last_used_idx = vq->last_avail_idx;
 899                 vq->used_wrap_counter = vq->avail_wrap_counter;
 900         } else {
 901                 vq->last_used_idx = msg->payload.state.num;
 902                 vq->last_avail_idx = msg->payload.state.num;
 903         }
 904
 905         return RTE_VHOST_MSG_RESULT_OK;
 906 }
 907
 908 static int
 909 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr,
 910                    uint64_t host_phys_addr, uint64_t size)
 911 {
 912         struct guest_page *page, *last_page;
 913         struct guest_page *old_pages;
 914
 915         if (dev->nr_guest_pages == dev->max_guest_pages) {
 916                 dev->max_guest_pages *= 2;
 917                 old_pages = dev->guest_pages;
 918                 dev->guest_pages = rte_realloc(dev->guest_pages,
 919                                         dev->max_guest_pages * sizeof(*page),
 920                                         RTE_CACHE_LINE_SIZE);
 921                 if (dev->guest_pages == NULL) {
 922                         VHOST_LOG_CONFIG(ERR, "cannot realloc guest_pages\n");
 923                         rte_free(old_pages);
 924                         return -1;
 925                 }
 926         }
 927
 928         if (dev->nr_guest_pages > 0) {
 929                 last_page = &dev->guest_pages[dev->nr_guest_pages - 1];
 930                 /* merge if the two pages are continuous */
 931                 if (host_phys_addr == last_page->host_phys_addr +
 932                                       last_page->size) {
 933                         last_page->size += size;
 934                         return 0;
 935                 }
 936         }
 937
 938         page = &dev->guest_pages[dev->nr_guest_pages++];
 939         page->guest_phys_addr = guest_phys_addr;
 940         page->host_phys_addr  = host_phys_addr;
 941         page->size = size;
 942
 943         return 0;
 944 }
 945
 946 static int
 947 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg,
 948                 uint64_t page_size)
 949 {
 950         uint64_t reg_size = reg->size;
 951         uint64_t host_user_addr  = reg->host_user_addr;
 952         uint64_t guest_phys_addr = reg->guest_phys_addr;
 953         uint64_t host_phys_addr;
 954         uint64_t size;
 955
 956         host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr);
 957         size = page_size - (guest_phys_addr & (page_size - 1));
 958         size = RTE_MIN(size, reg_size);
 959
 960         if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0)
 961                 return -1;
 962
 963         host_user_addr  += size;
 964         guest_phys_addr += size;
 965         reg_size -= size;
 966
 967         while (reg_size > 0) {
 968                 size = RTE_MIN(reg_size, page_size);
 969                 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)
 970                                                   host_user_addr);
 971                 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr,
 972                                 size) < 0)
 973                         return -1;
 974
 975                 host_user_addr  += size;
 976                 guest_phys_addr += size;
 977                 reg_size -= size;
 978         }
 979
 980         /* sort guest page array if over binary search threshold */
 981         if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) {
 982                 qsort((void *)dev->guest_pages, dev->nr_guest_pages,
 983                         sizeof(struct guest_page), guest_page_addrcmp);
 984         }
 985
 986         return 0;
 987 }
 988
 989 #ifdef RTE_LIBRTE_VHOST_DEBUG
 990 /* TODO: enable it only in debug mode? */
 991 static void
 992 dump_guest_pages(struct virtio_net *dev)
 993 {
 994         uint32_t i;
 995         struct guest_page *page;
 996
 997         for (i = 0; i < dev->nr_guest_pages; i++) {
 998                 page = &dev->guest_pages[i];
 999
1000                 VHOST_LOG_CONFIG(INFO,
1001                         "guest physical page region %u\n"
1002                         "\t guest_phys_addr: %" PRIx64 "\n"
1003                         "\t host_phys_addr : %" PRIx64 "\n"
1004                         "\t size           : %" PRIx64 "\n",
1005                         i,
1006                         page->guest_phys_addr,
1007                         page->host_phys_addr,
1008                         page->size);
1009         }
1010 }
1011 #else
1012 #define dump_guest_pages(dev)
1013 #endif
1014
1015 static bool
1016 vhost_memory_changed(struct VhostUserMemory *new,
1017                      struct rte_vhost_memory *old)
1018 {
1019         uint32_t i;
1020
1021         if (new->nregions != old->nregions)
1022                 return true;
1023
1024         for (i = 0; i < new->nregions; ++i) {
1025                 VhostUserMemoryRegion *new_r = &new->regions[i];
1026                 struct rte_vhost_mem_region *old_r = &old->regions[i];
1027
1028                 if (new_r->guest_phys_addr != old_r->guest_phys_addr)
1029                         return true;
1030                 if (new_r->memory_size != old_r->size)
1031                         return true;
1032                 if (new_r->userspace_addr != old_r->guest_user_addr)
1033                         return true;
1034         }
1035
1036         return false;
1037 }
1038
1039 static int
1040 vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg,
1041                         int main_fd)
1042 {
1043         struct virtio_net *dev = *pdev;
1044         struct VhostUserMemory *memory = &msg->payload.memory;
1045         struct rte_vhost_mem_region *reg;
1046         void *mmap_addr;
1047         uint64_t mmap_size;
1048         uint64_t mmap_offset;
1049         uint64_t alignment;
1050         uint32_t i;
1051         int populate;
1052         int fd;
1053
1054         if (validate_msg_fds(msg, memory->nregions) != 0)
1055                 return RTE_VHOST_MSG_RESULT_ERR;
1056
1057         if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) {
1058                 VHOST_LOG_CONFIG(ERR,
1059                         "too many memory regions (%u)\n", memory->nregions);
1060                 return RTE_VHOST_MSG_RESULT_ERR;
1061         }
1062
1063         if (dev->mem && !vhost_memory_changed(memory, dev->mem)) {
1064                 VHOST_LOG_CONFIG(INFO,
1065                         "(%d) memory regions not changed\n", dev->vid);
1066
1067                 close_msg_fds(msg);
1068
1069                 return RTE_VHOST_MSG_RESULT_OK;
1070         }
1071
1072         if (dev->mem) {
1073                 if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) {
1074                         struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev;
1075
1076                         if (vdpa_dev && vdpa_dev->ops->dev_close)
1077                                 vdpa_dev->ops->dev_close(dev->vid);
1078                         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1079                 }
1080                 free_mem_region(dev);
1081                 rte_free(dev->mem);
1082                 dev->mem = NULL;
1083         }
1084
1085         /* Flush IOTLB cache as previous HVAs are now invalid */
1086         if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))
1087                 for (i = 0; i < dev->nr_vring; i++)
1088                         vhost_user_iotlb_flush_all(dev->virtqueue[i]);
1089
1090         dev->nr_guest_pages = 0;
1091         if (dev->guest_pages == NULL) {
1092                 dev->max_guest_pages = 8;
1093                 dev->guest_pages = rte_zmalloc(NULL,
1094                                         dev->max_guest_pages *
1095                                         sizeof(struct guest_page),
1096                                         RTE_CACHE_LINE_SIZE);
1097                 if (dev->guest_pages == NULL) {
1098                         VHOST_LOG_CONFIG(ERR,
1099                                 "(%d) failed to allocate memory "
1100                                 "for dev->guest_pages\n",
1101                                 dev->vid);
1102                         return RTE_VHOST_MSG_RESULT_ERR;
1103                 }
1104         }
1105
1106         dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) +
1107                 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0);
1108         if (dev->mem == NULL) {
1109                 VHOST_LOG_CONFIG(ERR,
1110                         "(%d) failed to allocate memory for dev->mem\n",
1111                         dev->vid);
1112                 return RTE_VHOST_MSG_RESULT_ERR;
1113         }
1114         dev->mem->nregions = memory->nregions;
1115
1116         for (i = 0; i < memory->nregions; i++) {
1117                 fd  = msg->fds[i];
1118                 reg = &dev->mem->regions[i];
1119
1120                 reg->guest_phys_addr = memory->regions[i].guest_phys_addr;
1121                 reg->guest_user_addr = memory->regions[i].userspace_addr;
1122                 reg->size            = memory->regions[i].memory_size;
1123                 reg->fd              = fd;
1124
1125                 mmap_offset = memory->regions[i].mmap_offset;
1126
1127                 /* Check for memory_size + mmap_offset overflow */
1128                 if (mmap_offset >= -reg->size) {
1129                         VHOST_LOG_CONFIG(ERR,
1130                                 "mmap_offset (%#"PRIx64") and memory_size "
1131                                 "(%#"PRIx64") overflow\n",
1132                                 mmap_offset, reg->size);
1133                         goto err_mmap;
1134                 }
1135
1136                 mmap_size = reg->size + mmap_offset;
1137
1138                 /* mmap() without flag of MAP_ANONYMOUS, should be called
1139                  * with length argument aligned with hugepagesz at older
1140                  * longterm version Linux, like 2.6.32 and 3.2.72, or
1141                  * mmap() will fail with EINVAL.
1142                  *
1143                  * to avoid failure, make sure in caller to keep length
1144                  * aligned.
1145                  */
1146                 alignment = get_blk_size(fd);
1147                 if (alignment == (uint64_t)-1) {
1148                         VHOST_LOG_CONFIG(ERR,
1149                                 "couldn't get hugepage size through fstat\n");
1150                         goto err_mmap;
1151                 }
1152                 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment);
1153                 if (mmap_size == 0) {
1154                         /*
1155                          * It could happen if initial mmap_size + alignment
1156                          * overflows the sizeof uint64, which could happen if
1157                          * either mmap_size or alignment value is wrong.
1158                          *
1159                          * mmap() kernel implementation would return an error,
1160                          * but better catch it before and provide useful info
1161                          * in the logs.
1162                          */
1163                         VHOST_LOG_CONFIG(ERR, "mmap size (0x%" PRIx64 ") "
1164                                         "or alignment (0x%" PRIx64 ") is invalid\n",
1165                                         reg->size + mmap_offset, alignment);
1166                         goto err_mmap;
1167                 }
1168
1169                 populate = (dev->dequeue_zero_copy) ? MAP_POPULATE : 0;
1170                 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE,
1171                                  MAP_SHARED | populate, fd, 0);
1172
1173                 if (mmap_addr == MAP_FAILED) {
1174                         VHOST_LOG_CONFIG(ERR,
1175                                 "mmap region %u failed.\n", i);
1176                         goto err_mmap;
1177                 }
1178
1179                 reg->mmap_addr = mmap_addr;
1180                 reg->mmap_size = mmap_size;
1181                 reg->host_user_addr = (uint64_t)(uintptr_t)mmap_addr +
1182                                       mmap_offset;
1183
1184                 if (dev->dequeue_zero_copy)
1185                         if (add_guest_pages(dev, reg, alignment) < 0) {
1186                                 VHOST_LOG_CONFIG(ERR,
1187                                         "adding guest pages to region %u failed.\n",
1188                                         i);
1189                                 goto err_mmap;
1190                         }
1191
1192                 VHOST_LOG_CONFIG(INFO,
1193                         "guest memory region %u, size: 0x%" PRIx64 "\n"
1194                         "\t guest physical addr: 0x%" PRIx64 "\n"
1195                         "\t guest virtual  addr: 0x%" PRIx64 "\n"
1196                         "\t host  virtual  addr: 0x%" PRIx64 "\n"
1197                         "\t mmap addr : 0x%" PRIx64 "\n"
1198                         "\t mmap size : 0x%" PRIx64 "\n"
1199                         "\t mmap align: 0x%" PRIx64 "\n"
1200                         "\t mmap off  : 0x%" PRIx64 "\n",
1201                         i, reg->size,
1202                         reg->guest_phys_addr,
1203                         reg->guest_user_addr,
1204                         reg->host_user_addr,
1205                         (uint64_t)(uintptr_t)mmap_addr,
1206                         mmap_size,
1207                         alignment,
1208                         mmap_offset);
1209
1210                 if (dev->postcopy_listening) {
1211                         /*
1212                          * We haven't a better way right now than sharing
1213                          * DPDK's virtual address with Qemu, so that Qemu can
1214                          * retrieve the region offset when handling userfaults.
1215                          */
1216                         memory->regions[i].userspace_addr =
1217                                 reg->host_user_addr;
1218                 }
1219         }
1220         if (dev->postcopy_listening) {
1221                 /* Send the addresses back to qemu */
1222                 msg->fd_num = 0;
1223                 send_vhost_reply(main_fd, msg);
1224
1225                 /* Wait for qemu to acknolwedge it's got the addresses
1226                  * we've got to wait before we're allowed to generate faults.
1227                  */
1228                 VhostUserMsg ack_msg;
1229                 if (read_vhost_message(main_fd, &ack_msg) <= 0) {
1230                         VHOST_LOG_CONFIG(ERR,
1231                                 "Failed to read qemu ack on postcopy set-mem-table\n");
1232                         goto err_mmap;
1233                 }
1234
1235                 if (validate_msg_fds(&ack_msg, 0) != 0)
1236                         goto err_mmap;
1237
1238                 if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) {
1239                         VHOST_LOG_CONFIG(ERR,
1240                                 "Bad qemu ack on postcopy set-mem-table (%d)\n",
1241                                 ack_msg.request.master);
1242                         goto err_mmap;
1243                 }
1244
1245                 /* Now userfault register and we can use the memory */
1246                 for (i = 0; i < memory->nregions; i++) {
1247 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
1248                         reg = &dev->mem->regions[i];
1249                         struct uffdio_register reg_struct;
1250
1251                         /*
1252                          * Let's register all the mmap'ed area to ensure
1253                          * alignment on page boundary.
1254                          */
1255                         reg_struct.range.start =
1256                                 (uint64_t)(uintptr_t)reg->mmap_addr;
1257                         reg_struct.range.len = reg->mmap_size;
1258                         reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING;
1259
1260                         if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER,
1261                                                 &reg_struct)) {
1262                                 VHOST_LOG_CONFIG(ERR,
1263                                         "Failed to register ufd for region %d: (ufd = %d) %s\n",
1264                                         i, dev->postcopy_ufd,
1265                                         strerror(errno));
1266                                 goto err_mmap;
1267                         }
1268                         VHOST_LOG_CONFIG(INFO,
1269                                 "\t userfaultfd registered for range : "
1270                                 "%" PRIx64 " - %" PRIx64 "\n",
1271                                 (uint64_t)reg_struct.range.start,
1272                                 (uint64_t)reg_struct.range.start +
1273                                 (uint64_t)reg_struct.range.len - 1);
1274 #else
1275                         goto err_mmap;
1276 #endif
1277                 }
1278         }
1279
1280         for (i = 0; i < dev->nr_vring; i++) {
1281                 struct vhost_virtqueue *vq = dev->virtqueue[i];
1282
1283                 if (vq->desc || vq->avail || vq->used) {
1284                         /*
1285                          * If the memory table got updated, the ring addresses
1286                          * need to be translated again as virtual addresses have
1287                          * changed.
1288                          */
1289                         vring_invalidate(dev, vq);
1290
1291                         dev = translate_ring_addresses(dev, i);
1292                         if (!dev) {
1293                                 dev = *pdev;
1294                                 goto err_mmap;
1295                         }
1296
1297                         *pdev = dev;
1298                 }
1299         }
1300
1301         dump_guest_pages(dev);
1302
1303         return RTE_VHOST_MSG_RESULT_OK;
1304
1305 err_mmap:
1306         free_mem_region(dev);
1307         rte_free(dev->mem);
1308         dev->mem = NULL;
1309         return RTE_VHOST_MSG_RESULT_ERR;
1310 }
1311
1312 static bool
1313 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq)
1314 {
1315         bool rings_ok;
1316
1317         if (!vq)
1318                 return false;
1319
1320         if (vq_is_packed(dev))
1321                 rings_ok = vq->desc_packed && vq->driver_event &&
1322                         vq->device_event;
1323         else
1324                 rings_ok = vq->desc && vq->avail && vq->used;
1325
1326         return rings_ok &&
1327                vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1328                vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD &&
1329                vq->enabled;
1330 }
1331
1332 #define VIRTIO_DEV_NUM_VQS_TO_BE_READY 2u
1333
1334 static int
1335 virtio_is_ready(struct virtio_net *dev)
1336 {
1337         struct vhost_virtqueue *vq;
1338         uint32_t i;
1339
1340         if (dev->nr_vring < VIRTIO_DEV_NUM_VQS_TO_BE_READY)
1341                 return 0;
1342
1343         for (i = 0; i < VIRTIO_DEV_NUM_VQS_TO_BE_READY; i++) {
1344                 vq = dev->virtqueue[i];
1345
1346                 if (!vq_is_ready(dev, vq))
1347                         return 0;
1348         }
1349
1350         if (!(dev->flags & VIRTIO_DEV_RUNNING))
1351                 VHOST_LOG_CONFIG(INFO,
1352                         "virtio is now ready for processing.\n");
1353         return 1;
1354 }
1355
1356 static void *
1357 inflight_mem_alloc(const char *name, size_t size, int *fd)
1358 {
1359         void *ptr;
1360         int mfd = -1;
1361         char fname[20] = "/tmp/memfd-XXXXXX";
1362
1363         *fd = -1;
1364 #ifdef MEMFD_SUPPORTED
1365         mfd = memfd_create(name, MFD_CLOEXEC);
1366 #else
1367         RTE_SET_USED(name);
1368 #endif
1369         if (mfd == -1) {
1370                 mfd = mkstemp(fname);
1371                 if (mfd == -1) {
1372                         VHOST_LOG_CONFIG(ERR,
1373                                 "failed to get inflight buffer fd\n");
1374                         return NULL;
1375                 }
1376
1377                 unlink(fname);
1378         }
1379
1380         if (ftruncate(mfd, size) == -1) {
1381                 VHOST_LOG_CONFIG(ERR,
1382                         "failed to alloc inflight buffer\n");
1383                 close(mfd);
1384                 return NULL;
1385         }
1386
1387         ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0);
1388         if (ptr == MAP_FAILED) {
1389                 VHOST_LOG_CONFIG(ERR,
1390                         "failed to mmap inflight buffer\n");
1391                 close(mfd);
1392                 return NULL;
1393         }
1394
1395         *fd = mfd;
1396         return ptr;
1397 }
1398
1399 static uint32_t
1400 get_pervq_shm_size_split(uint16_t queue_size)
1401 {
1402         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) *
1403                                   queue_size + sizeof(uint64_t) +
1404                                   sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT);
1405 }
1406
1407 static uint32_t
1408 get_pervq_shm_size_packed(uint16_t queue_size)
1409 {
1410         return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed)
1411                                   * queue_size + sizeof(uint64_t) +
1412                                   sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9,
1413                                   INFLIGHT_ALIGNMENT);
1414 }
1415
1416 static int
1417 vhost_user_get_inflight_fd(struct virtio_net **pdev,
1418                            VhostUserMsg *msg,
1419                            int main_fd __rte_unused)
1420 {
1421         struct rte_vhost_inflight_info_packed *inflight_packed;
1422         uint64_t pervq_inflight_size, mmap_size;
1423         uint16_t num_queues, queue_size;
1424         struct virtio_net *dev = *pdev;
1425         int fd, i, j;
1426         void *addr;
1427
1428         if (msg->size != sizeof(msg->payload.inflight)) {
1429                 VHOST_LOG_CONFIG(ERR,
1430                         "invalid get_inflight_fd message size is %d\n",
1431                         msg->size);
1432                 return RTE_VHOST_MSG_RESULT_ERR;
1433         }
1434
1435         if (dev->inflight_info == NULL) {
1436                 dev->inflight_info = calloc(1,
1437                                             sizeof(struct inflight_mem_info));
1438                 if (!dev->inflight_info) {
1439                         VHOST_LOG_CONFIG(ERR,
1440                                 "failed to alloc dev inflight area\n");
1441                         return RTE_VHOST_MSG_RESULT_ERR;
1442                 }
1443                 dev->inflight_info->fd = -1;
1444         }
1445
1446         num_queues = msg->payload.inflight.num_queues;
1447         queue_size = msg->payload.inflight.queue_size;
1448
1449         VHOST_LOG_CONFIG(INFO, "get_inflight_fd num_queues: %u\n",
1450                 msg->payload.inflight.num_queues);
1451         VHOST_LOG_CONFIG(INFO, "get_inflight_fd queue_size: %u\n",
1452                 msg->payload.inflight.queue_size);
1453
1454         if (vq_is_packed(dev))
1455                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1456         else
1457                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1458
1459         mmap_size = num_queues * pervq_inflight_size;
1460         addr = inflight_mem_alloc("vhost-inflight", mmap_size, &fd);
1461         if (!addr) {
1462                 VHOST_LOG_CONFIG(ERR,
1463                         "failed to alloc vhost inflight area\n");
1464                         msg->payload.inflight.mmap_size = 0;
1465                 return RTE_VHOST_MSG_RESULT_ERR;
1466         }
1467         memset(addr, 0, mmap_size);
1468
1469         if (dev->inflight_info->addr) {
1470                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1471                 dev->inflight_info->addr = NULL;
1472         }
1473
1474         if (dev->inflight_info->fd >= 0) {
1475                 close(dev->inflight_info->fd);
1476                 dev->inflight_info->fd = -1;
1477         }
1478
1479         dev->inflight_info->addr = addr;
1480         dev->inflight_info->size = msg->payload.inflight.mmap_size = mmap_size;
1481         dev->inflight_info->fd = msg->fds[0] = fd;
1482         msg->payload.inflight.mmap_offset = 0;
1483         msg->fd_num = 1;
1484
1485         if (vq_is_packed(dev)) {
1486                 for (i = 0; i < num_queues; i++) {
1487                         inflight_packed =
1488                                 (struct rte_vhost_inflight_info_packed *)addr;
1489                         inflight_packed->used_wrap_counter = 1;
1490                         inflight_packed->old_used_wrap_counter = 1;
1491                         for (j = 0; j < queue_size; j++)
1492                                 inflight_packed->desc[j].next = j + 1;
1493                         addr = (void *)((char *)addr + pervq_inflight_size);
1494                 }
1495         }
1496
1497         VHOST_LOG_CONFIG(INFO,
1498                 "send inflight mmap_size: %"PRIu64"\n",
1499                 msg->payload.inflight.mmap_size);
1500         VHOST_LOG_CONFIG(INFO,
1501                 "send inflight mmap_offset: %"PRIu64"\n",
1502                 msg->payload.inflight.mmap_offset);
1503         VHOST_LOG_CONFIG(INFO,
1504                 "send inflight fd: %d\n", msg->fds[0]);
1505
1506         return RTE_VHOST_MSG_RESULT_REPLY;
1507 }
1508
1509 static int
1510 vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg,
1511                            int main_fd __rte_unused)
1512 {
1513         uint64_t mmap_size, mmap_offset;
1514         uint16_t num_queues, queue_size;
1515         struct virtio_net *dev = *pdev;
1516         uint32_t pervq_inflight_size;
1517         struct vhost_virtqueue *vq;
1518         void *addr;
1519         int fd, i;
1520
1521         fd = msg->fds[0];
1522         if (msg->size != sizeof(msg->payload.inflight) || fd < 0) {
1523                 VHOST_LOG_CONFIG(ERR,
1524                         "invalid set_inflight_fd message size is %d,fd is %d\n",
1525                         msg->size, fd);
1526                 return RTE_VHOST_MSG_RESULT_ERR;
1527         }
1528
1529         mmap_size = msg->payload.inflight.mmap_size;
1530         mmap_offset = msg->payload.inflight.mmap_offset;
1531         num_queues = msg->payload.inflight.num_queues;
1532         queue_size = msg->payload.inflight.queue_size;
1533
1534         if (vq_is_packed(dev))
1535                 pervq_inflight_size = get_pervq_shm_size_packed(queue_size);
1536         else
1537                 pervq_inflight_size = get_pervq_shm_size_split(queue_size);
1538
1539         VHOST_LOG_CONFIG(INFO,
1540                 "set_inflight_fd mmap_size: %"PRIu64"\n", mmap_size);
1541         VHOST_LOG_CONFIG(INFO,
1542                 "set_inflight_fd mmap_offset: %"PRIu64"\n", mmap_offset);
1543         VHOST_LOG_CONFIG(INFO,
1544                 "set_inflight_fd num_queues: %u\n", num_queues);
1545         VHOST_LOG_CONFIG(INFO,
1546                 "set_inflight_fd queue_size: %u\n", queue_size);
1547         VHOST_LOG_CONFIG(INFO,
1548                 "set_inflight_fd fd: %d\n", fd);
1549         VHOST_LOG_CONFIG(INFO,
1550                 "set_inflight_fd pervq_inflight_size: %d\n",
1551                 pervq_inflight_size);
1552
1553         if (!dev->inflight_info) {
1554                 dev->inflight_info = calloc(1,
1555                                             sizeof(struct inflight_mem_info));
1556                 if (dev->inflight_info == NULL) {
1557                         VHOST_LOG_CONFIG(ERR,
1558                                 "failed to alloc dev inflight area\n");
1559                         return RTE_VHOST_MSG_RESULT_ERR;
1560                 }
1561                 dev->inflight_info->fd = -1;
1562         }
1563
1564         if (dev->inflight_info->addr) {
1565                 munmap(dev->inflight_info->addr, dev->inflight_info->size);
1566                 dev->inflight_info->addr = NULL;
1567         }
1568
1569         addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
1570                     fd, mmap_offset);
1571         if (addr == MAP_FAILED) {
1572                 VHOST_LOG_CONFIG(ERR, "failed to mmap share memory.\n");
1573                 return RTE_VHOST_MSG_RESULT_ERR;
1574         }
1575
1576         if (dev->inflight_info->fd >= 0) {
1577                 close(dev->inflight_info->fd);
1578                 dev->inflight_info->fd = -1;
1579         }
1580
1581         dev->inflight_info->fd = fd;
1582         dev->inflight_info->addr = addr;
1583         dev->inflight_info->size = mmap_size;
1584
1585         for (i = 0; i < num_queues; i++) {
1586                 vq = dev->virtqueue[i];
1587                 if (vq_is_packed(dev)) {
1588                         vq->inflight_packed = addr;
1589                         vq->inflight_packed->desc_num = queue_size;
1590                 } else {
1591                         vq->inflight_split = addr;
1592                         vq->inflight_split->desc_num = queue_size;
1593                 }
1594                 addr = (void *)((char *)addr + pervq_inflight_size);
1595         }
1596
1597         return RTE_VHOST_MSG_RESULT_OK;
1598 }
1599
1600 static int
1601 vhost_user_set_vring_call(struct virtio_net **pdev, struct VhostUserMsg *msg,
1602                         int main_fd __rte_unused)
1603 {
1604         struct virtio_net *dev = *pdev;
1605         struct vhost_vring_file file;
1606         struct vhost_virtqueue *vq;
1607         int expected_fds;
1608
1609         expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1610         if (validate_msg_fds(msg, expected_fds) != 0)
1611                 return RTE_VHOST_MSG_RESULT_ERR;
1612
1613         file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1614         if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1615                 file.fd = VIRTIO_INVALID_EVENTFD;
1616         else
1617                 file.fd = msg->fds[0];
1618         VHOST_LOG_CONFIG(INFO,
1619                 "vring call idx:%d file:%d\n", file.index, file.fd);
1620
1621         vq = dev->virtqueue[file.index];
1622         if (vq->callfd >= 0)
1623                 close(vq->callfd);
1624
1625         vq->callfd = file.fd;
1626
1627         return RTE_VHOST_MSG_RESULT_OK;
1628 }
1629
1630 static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused,
1631                         struct VhostUserMsg *msg,
1632                         int main_fd __rte_unused)
1633 {
1634         int expected_fds;
1635
1636         expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1637         if (validate_msg_fds(msg, expected_fds) != 0)
1638                 return RTE_VHOST_MSG_RESULT_ERR;
1639
1640         if (!(msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK))
1641                 close(msg->fds[0]);
1642         VHOST_LOG_CONFIG(INFO, "not implemented\n");
1643
1644         return RTE_VHOST_MSG_RESULT_OK;
1645 }
1646
1647 static int
1648 resubmit_desc_compare(const void *a, const void *b)
1649 {
1650         const struct rte_vhost_resubmit_desc *desc0 = a;
1651         const struct rte_vhost_resubmit_desc *desc1 = b;
1652
1653         if (desc1->counter > desc0->counter)
1654                 return 1;
1655
1656         return -1;
1657 }
1658
1659 static int
1660 vhost_check_queue_inflights_split(struct virtio_net *dev,
1661                                   struct vhost_virtqueue *vq)
1662 {
1663         uint16_t i;
1664         uint16_t resubmit_num = 0, last_io, num;
1665         struct vring_used *used = vq->used;
1666         struct rte_vhost_resubmit_info *resubmit;
1667         struct rte_vhost_inflight_info_split *inflight_split;
1668
1669         if (!(dev->protocol_features &
1670             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1671                 return RTE_VHOST_MSG_RESULT_OK;
1672
1673         /* The frontend may still not support the inflight feature
1674          * although we negotiate the protocol feature.
1675          */
1676         if ((!vq->inflight_split))
1677                 return RTE_VHOST_MSG_RESULT_OK;
1678
1679         if (!vq->inflight_split->version) {
1680                 vq->inflight_split->version = INFLIGHT_VERSION;
1681                 return RTE_VHOST_MSG_RESULT_OK;
1682         }
1683
1684         if (vq->resubmit_inflight)
1685                 return RTE_VHOST_MSG_RESULT_OK;
1686
1687         inflight_split = vq->inflight_split;
1688         vq->global_counter = 0;
1689         last_io = inflight_split->last_inflight_io;
1690
1691         if (inflight_split->used_idx != used->idx) {
1692                 inflight_split->desc[last_io].inflight = 0;
1693                 rte_smp_mb();
1694                 inflight_split->used_idx = used->idx;
1695         }
1696
1697         for (i = 0; i < inflight_split->desc_num; i++) {
1698                 if (inflight_split->desc[i].inflight == 1)
1699                         resubmit_num++;
1700         }
1701
1702         vq->last_avail_idx += resubmit_num;
1703
1704         if (resubmit_num) {
1705                 resubmit  = calloc(1, sizeof(struct rte_vhost_resubmit_info));
1706                 if (!resubmit) {
1707                         VHOST_LOG_CONFIG(ERR,
1708                                 "failed to allocate memory for resubmit info.\n");
1709                         return RTE_VHOST_MSG_RESULT_ERR;
1710                 }
1711
1712                 resubmit->resubmit_list = calloc(resubmit_num,
1713                         sizeof(struct rte_vhost_resubmit_desc));
1714                 if (!resubmit->resubmit_list) {
1715                         VHOST_LOG_CONFIG(ERR,
1716                                 "failed to allocate memory for inflight desc.\n");
1717                         free(resubmit);
1718                         return RTE_VHOST_MSG_RESULT_ERR;
1719                 }
1720
1721                 num = 0;
1722                 for (i = 0; i < vq->inflight_split->desc_num; i++) {
1723                         if (vq->inflight_split->desc[i].inflight == 1) {
1724                                 resubmit->resubmit_list[num].index = i;
1725                                 resubmit->resubmit_list[num].counter =
1726                                         inflight_split->desc[i].counter;
1727                                 num++;
1728                         }
1729                 }
1730                 resubmit->resubmit_num = num;
1731
1732                 if (resubmit->resubmit_num > 1)
1733                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1734                               sizeof(struct rte_vhost_resubmit_desc),
1735                               resubmit_desc_compare);
1736
1737                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1738                 vq->resubmit_inflight = resubmit;
1739         }
1740
1741         return RTE_VHOST_MSG_RESULT_OK;
1742 }
1743
1744 static int
1745 vhost_check_queue_inflights_packed(struct virtio_net *dev,
1746                                    struct vhost_virtqueue *vq)
1747 {
1748         uint16_t i;
1749         uint16_t resubmit_num = 0, old_used_idx, num;
1750         struct rte_vhost_resubmit_info *resubmit;
1751         struct rte_vhost_inflight_info_packed *inflight_packed;
1752
1753         if (!(dev->protocol_features &
1754             (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD)))
1755                 return RTE_VHOST_MSG_RESULT_OK;
1756
1757         /* The frontend may still not support the inflight feature
1758          * although we negotiate the protocol feature.
1759          */
1760         if ((!vq->inflight_packed))
1761                 return RTE_VHOST_MSG_RESULT_OK;
1762
1763         if (!vq->inflight_packed->version) {
1764                 vq->inflight_packed->version = INFLIGHT_VERSION;
1765                 return RTE_VHOST_MSG_RESULT_OK;
1766         }
1767
1768         if (vq->resubmit_inflight)
1769                 return RTE_VHOST_MSG_RESULT_OK;
1770
1771         inflight_packed = vq->inflight_packed;
1772         vq->global_counter = 0;
1773         old_used_idx = inflight_packed->old_used_idx;
1774
1775         if (inflight_packed->used_idx != old_used_idx) {
1776                 if (inflight_packed->desc[old_used_idx].inflight == 0) {
1777                         inflight_packed->old_used_idx =
1778                                 inflight_packed->used_idx;
1779                         inflight_packed->old_used_wrap_counter =
1780                                 inflight_packed->used_wrap_counter;
1781                         inflight_packed->old_free_head =
1782                                 inflight_packed->free_head;
1783                 } else {
1784                         inflight_packed->used_idx =
1785                                 inflight_packed->old_used_idx;
1786                         inflight_packed->used_wrap_counter =
1787                                 inflight_packed->old_used_wrap_counter;
1788                         inflight_packed->free_head =
1789                                 inflight_packed->old_free_head;
1790                 }
1791         }
1792
1793         for (i = 0; i < inflight_packed->desc_num; i++) {
1794                 if (inflight_packed->desc[i].inflight == 1)
1795                         resubmit_num++;
1796         }
1797
1798         if (resubmit_num) {
1799                 resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info));
1800                 if (resubmit == NULL) {
1801                         VHOST_LOG_CONFIG(ERR,
1802                                 "failed to allocate memory for resubmit info.\n");
1803                         return RTE_VHOST_MSG_RESULT_ERR;
1804                 }
1805
1806                 resubmit->resubmit_list = calloc(resubmit_num,
1807                         sizeof(struct rte_vhost_resubmit_desc));
1808                 if (resubmit->resubmit_list == NULL) {
1809                         VHOST_LOG_CONFIG(ERR,
1810                                 "failed to allocate memory for resubmit desc.\n");
1811                         free(resubmit);
1812                         return RTE_VHOST_MSG_RESULT_ERR;
1813                 }
1814
1815                 num = 0;
1816                 for (i = 0; i < inflight_packed->desc_num; i++) {
1817                         if (vq->inflight_packed->desc[i].inflight == 1) {
1818                                 resubmit->resubmit_list[num].index = i;
1819                                 resubmit->resubmit_list[num].counter =
1820                                         inflight_packed->desc[i].counter;
1821                                 num++;
1822                         }
1823                 }
1824                 resubmit->resubmit_num = num;
1825
1826                 if (resubmit->resubmit_num > 1)
1827                         qsort(resubmit->resubmit_list, resubmit->resubmit_num,
1828                               sizeof(struct rte_vhost_resubmit_desc),
1829                               resubmit_desc_compare);
1830
1831                 vq->global_counter = resubmit->resubmit_list[0].counter + 1;
1832                 vq->resubmit_inflight = resubmit;
1833         }
1834
1835         return RTE_VHOST_MSG_RESULT_OK;
1836 }
1837
1838 static int
1839 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg,
1840                         int main_fd __rte_unused)
1841 {
1842         struct virtio_net *dev = *pdev;
1843         struct vhost_vring_file file;
1844         struct vhost_virtqueue *vq;
1845         int expected_fds;
1846
1847         expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1;
1848         if (validate_msg_fds(msg, expected_fds) != 0)
1849                 return RTE_VHOST_MSG_RESULT_ERR;
1850
1851         file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
1852         if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)
1853                 file.fd = VIRTIO_INVALID_EVENTFD;
1854         else
1855                 file.fd = msg->fds[0];
1856         VHOST_LOG_CONFIG(INFO,
1857                 "vring kick idx:%d file:%d\n", file.index, file.fd);
1858
1859         /* Interpret ring addresses only when ring is started. */
1860         dev = translate_ring_addresses(dev, file.index);
1861         if (!dev)
1862                 return RTE_VHOST_MSG_RESULT_ERR;
1863
1864         *pdev = dev;
1865
1866         vq = dev->virtqueue[file.index];
1867
1868         /*
1869          * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated,
1870          * the ring starts already enabled. Otherwise, it is enabled via
1871          * the SET_VRING_ENABLE message.
1872          */
1873         if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) {
1874                 vq->enabled = 1;
1875                 if (dev->notify_ops->vring_state_changed)
1876                         dev->notify_ops->vring_state_changed(
1877                                 dev->vid, file.index, 1);
1878         }
1879
1880         if (vq->kickfd >= 0)
1881                 close(vq->kickfd);
1882         vq->kickfd = file.fd;
1883
1884         if (vq_is_packed(dev)) {
1885                 if (vhost_check_queue_inflights_packed(dev, vq)) {
1886                         VHOST_LOG_CONFIG(ERR,
1887                                 "failed to inflights for vq: %d\n", file.index);
1888                         return RTE_VHOST_MSG_RESULT_ERR;
1889                 }
1890         } else {
1891                 if (vhost_check_queue_inflights_split(dev, vq)) {
1892                         VHOST_LOG_CONFIG(ERR,
1893                                 "failed to inflights for vq: %d\n", file.index);
1894                         return RTE_VHOST_MSG_RESULT_ERR;
1895                 }
1896         }
1897
1898         return RTE_VHOST_MSG_RESULT_OK;
1899 }
1900
1901 static void
1902 free_zmbufs(struct vhost_virtqueue *vq)
1903 {
1904         drain_zmbuf_list(vq);
1905
1906         rte_free(vq->zmbufs);
1907 }
1908
1909 /*
1910  * when virtio is stopped, qemu will send us the GET_VRING_BASE message.
1911  */
1912 static int
1913 vhost_user_get_vring_base(struct virtio_net **pdev,
1914                         struct VhostUserMsg *msg,
1915                         int main_fd __rte_unused)
1916 {
1917         struct virtio_net *dev = *pdev;
1918         struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index];
1919         uint64_t val;
1920
1921         if (validate_msg_fds(msg, 0) != 0)
1922                 return RTE_VHOST_MSG_RESULT_ERR;
1923
1924         /* We have to stop the queue (virtio) if it is running. */
1925         vhost_destroy_device_notify(dev);
1926
1927         dev->flags &= ~VIRTIO_DEV_READY;
1928         dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED;
1929
1930         /* Here we are safe to get the indexes */
1931         if (vq_is_packed(dev)) {
1932                 /*
1933                  * Bit[0:14]: avail index
1934                  * Bit[15]: avail wrap counter
1935                  */
1936                 val = vq->last_avail_idx & 0x7fff;
1937                 val |= vq->avail_wrap_counter << 15;
1938                 msg->payload.state.num = val;
1939         } else {
1940                 msg->payload.state.num = vq->last_avail_idx;
1941         }
1942
1943         VHOST_LOG_CONFIG(INFO,
1944                 "vring base idx:%d file:%d\n", msg->payload.state.index,
1945                 msg->payload.state.num);
1946         /*
1947          * Based on current qemu vhost-user implementation, this message is
1948          * sent and only sent in vhost_vring_stop.
1949          * TODO: cleanup the vring, it isn't usable since here.
1950          */
1951         if (vq->kickfd >= 0)
1952                 close(vq->kickfd);
1953
1954         vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD;
1955
1956         if (vq->callfd >= 0)
1957                 close(vq->callfd);
1958
1959         vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD;
1960
1961         vq->signalled_used_valid = false;
1962
1963         if (dev->dequeue_zero_copy)
1964                 free_zmbufs(vq);
1965         if (vq_is_packed(dev)) {
1966                 rte_free(vq->shadow_used_packed);
1967                 vq->shadow_used_packed = NULL;
1968         } else {
1969                 rte_free(vq->shadow_used_split);
1970                 vq->shadow_used_split = NULL;
1971         }
1972
1973         rte_free(vq->batch_copy_elems);
1974         vq->batch_copy_elems = NULL;
1975
1976         msg->size = sizeof(msg->payload.state);
1977         msg->fd_num = 0;
1978
1979         vring_invalidate(dev, vq);
1980
1981         return RTE_VHOST_MSG_RESULT_REPLY;
1982 }
1983
1984 /*
1985  * when virtio queues are ready to work, qemu will send us to
1986  * enable the virtio queue pair.
1987  */
1988 static int
1989 vhost_user_set_vring_enable(struct virtio_net **pdev,
1990                         struct VhostUserMsg *msg,
1991                         int main_fd __rte_unused)
1992 {
1993         struct virtio_net *dev = *pdev;
1994         int enable = (int)msg->payload.state.num;
1995         int index = (int)msg->payload.state.index;
1996
1997         if (validate_msg_fds(msg, 0) != 0)
1998                 return RTE_VHOST_MSG_RESULT_ERR;
1999
2000         VHOST_LOG_CONFIG(INFO,
2001                 "set queue enable: %d to qp idx: %d\n",
2002                 enable, index);
2003
2004         /* On disable, rings have to be stopped being processed. */
2005         if (!enable && dev->dequeue_zero_copy)
2006                 drain_zmbuf_list(dev->virtqueue[index]);
2007
2008         dev->virtqueue[index]->enabled = enable;
2009
2010         return RTE_VHOST_MSG_RESULT_OK;
2011 }
2012
2013 static int
2014 vhost_user_get_protocol_features(struct virtio_net **pdev,
2015                         struct VhostUserMsg *msg,
2016                         int main_fd __rte_unused)
2017 {
2018         struct virtio_net *dev = *pdev;
2019         uint64_t features, protocol_features;
2020
2021         if (validate_msg_fds(msg, 0) != 0)
2022                 return RTE_VHOST_MSG_RESULT_ERR;
2023
2024         rte_vhost_driver_get_features(dev->ifname, &features);
2025         rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features);
2026
2027         msg->payload.u64 = protocol_features;
2028         msg->size = sizeof(msg->payload.u64);
2029         msg->fd_num = 0;
2030
2031         return RTE_VHOST_MSG_RESULT_REPLY;
2032 }
2033
2034 static int
2035 vhost_user_set_protocol_features(struct virtio_net **pdev,
2036                         struct VhostUserMsg *msg,
2037                         int main_fd __rte_unused)
2038 {
2039         struct virtio_net *dev = *pdev;
2040         uint64_t protocol_features = msg->payload.u64;
2041         uint64_t slave_protocol_features = 0;
2042
2043         if (validate_msg_fds(msg, 0) != 0)
2044                 return RTE_VHOST_MSG_RESULT_ERR;
2045
2046         rte_vhost_driver_get_protocol_features(dev->ifname,
2047                         &slave_protocol_features);
2048         if (protocol_features & ~slave_protocol_features) {
2049                 VHOST_LOG_CONFIG(ERR,
2050                         "(%d) received invalid protocol features.\n",
2051                         dev->vid);
2052                 return RTE_VHOST_MSG_RESULT_ERR;
2053         }
2054
2055         dev->protocol_features = protocol_features;
2056         VHOST_LOG_CONFIG(INFO,
2057                 "negotiated Vhost-user protocol features: 0x%" PRIx64 "\n",
2058                 dev->protocol_features);
2059
2060         return RTE_VHOST_MSG_RESULT_OK;
2061 }
2062
2063 static int
2064 vhost_user_set_log_base(struct virtio_net **pdev, struct VhostUserMsg *msg,
2065                         int main_fd __rte_unused)
2066 {
2067         struct virtio_net *dev = *pdev;
2068         int fd = msg->fds[0];
2069         uint64_t size, off;
2070         void *addr;
2071
2072         if (validate_msg_fds(msg, 1) != 0)
2073                 return RTE_VHOST_MSG_RESULT_ERR;
2074
2075         if (fd < 0) {
2076                 VHOST_LOG_CONFIG(ERR, "invalid log fd: %d\n", fd);
2077                 return RTE_VHOST_MSG_RESULT_ERR;
2078         }
2079
2080         if (msg->size != sizeof(VhostUserLog)) {
2081                 VHOST_LOG_CONFIG(ERR,
2082                         "invalid log base msg size: %"PRId32" != %d\n",
2083                         msg->size, (int)sizeof(VhostUserLog));
2084                 return RTE_VHOST_MSG_RESULT_ERR;
2085         }
2086
2087         size = msg->payload.log.mmap_size;
2088         off  = msg->payload.log.mmap_offset;
2089
2090         /* Check for mmap size and offset overflow. */
2091         if (off >= -size) {
2092                 VHOST_LOG_CONFIG(ERR,
2093                         "log offset %#"PRIx64" and log size %#"PRIx64" overflow\n",
2094                         off, size);
2095                 return RTE_VHOST_MSG_RESULT_ERR;
2096         }
2097
2098         VHOST_LOG_CONFIG(INFO,
2099                 "log mmap size: %"PRId64", offset: %"PRId64"\n",
2100                 size, off);
2101
2102         /*
2103          * mmap from 0 to workaround a hugepage mmap bug: mmap will
2104          * fail when offset is not page size aligned.
2105          */
2106         addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
2107         close(fd);
2108         if (addr == MAP_FAILED) {
2109                 VHOST_LOG_CONFIG(ERR, "mmap log base failed!\n");
2110                 return RTE_VHOST_MSG_RESULT_ERR;
2111         }
2112
2113         /*
2114          * Free previously mapped log memory on occasionally
2115          * multiple VHOST_USER_SET_LOG_BASE.
2116          */
2117         if (dev->log_addr) {
2118                 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size);
2119         }
2120         dev->log_addr = (uint64_t)(uintptr_t)addr;
2121         dev->log_base = dev->log_addr + off;
2122         dev->log_size = size;
2123
2124         /*
2125          * The spec is not clear about it (yet), but QEMU doesn't expect
2126          * any payload in the reply.
2127          */
2128         msg->size = 0;
2129         msg->fd_num = 0;
2130
2131         return RTE_VHOST_MSG_RESULT_REPLY;
2132 }
2133
2134 static int vhost_user_set_log_fd(struct virtio_net **pdev __rte_unused,
2135                         struct VhostUserMsg *msg,
2136                         int main_fd __rte_unused)
2137 {
2138         if (validate_msg_fds(msg, 1) != 0)
2139                 return RTE_VHOST_MSG_RESULT_ERR;
2140
2141         close(msg->fds[0]);
2142         VHOST_LOG_CONFIG(INFO, "not implemented.\n");
2143
2144         return RTE_VHOST_MSG_RESULT_OK;
2145 }
2146
2147 /*
2148  * An rarp packet is constructed and broadcasted to notify switches about
2149  * the new location of the migrated VM, so that packets from outside will
2150  * not be lost after migration.
2151  *
2152  * However, we don't actually "send" a rarp packet here, instead, we set
2153  * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it.
2154  */
2155 static int
2156 vhost_user_send_rarp(struct virtio_net **pdev, struct VhostUserMsg *msg,
2157                         int main_fd __rte_unused)
2158 {
2159         struct virtio_net *dev = *pdev;
2160         uint8_t *mac = (uint8_t *)&msg->payload.u64;
2161         struct rte_vdpa_device *vdpa_dev;
2162
2163         if (validate_msg_fds(msg, 0) != 0)
2164                 return RTE_VHOST_MSG_RESULT_ERR;
2165
2166         VHOST_LOG_CONFIG(DEBUG,
2167                 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n",
2168                 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]);
2169         memcpy(dev->mac.addr_bytes, mac, 6);
2170
2171         /*
2172          * Set the flag to inject a RARP broadcast packet at
2173          * rte_vhost_dequeue_burst().
2174          *
2175          * __ATOMIC_RELEASE ordering is for making sure the mac is
2176          * copied before the flag is set.
2177          */
2178         __atomic_store_n(&dev->broadcast_rarp, 1, __ATOMIC_RELEASE);
2179         vdpa_dev = dev->vdpa_dev;
2180         if (vdpa_dev && vdpa_dev->ops->migration_done)
2181                 vdpa_dev->ops->migration_done(dev->vid);
2182
2183         return RTE_VHOST_MSG_RESULT_OK;
2184 }
2185
2186 static int
2187 vhost_user_net_set_mtu(struct virtio_net **pdev, struct VhostUserMsg *msg,
2188                         int main_fd __rte_unused)
2189 {
2190         struct virtio_net *dev = *pdev;
2191
2192         if (validate_msg_fds(msg, 0) != 0)
2193                 return RTE_VHOST_MSG_RESULT_ERR;
2194
2195         if (msg->payload.u64 < VIRTIO_MIN_MTU ||
2196                         msg->payload.u64 > VIRTIO_MAX_MTU) {
2197                 VHOST_LOG_CONFIG(ERR, "Invalid MTU size (%"PRIu64")\n",
2198                                 msg->payload.u64);
2199
2200                 return RTE_VHOST_MSG_RESULT_ERR;
2201         }
2202
2203         dev->mtu = msg->payload.u64;
2204
2205         return RTE_VHOST_MSG_RESULT_OK;
2206 }
2207
2208 static int
2209 vhost_user_set_req_fd(struct virtio_net **pdev, struct VhostUserMsg *msg,
2210                         int main_fd __rte_unused)
2211 {
2212         struct virtio_net *dev = *pdev;
2213         int fd = msg->fds[0];
2214
2215         if (validate_msg_fds(msg, 1) != 0)
2216                 return RTE_VHOST_MSG_RESULT_ERR;
2217
2218         if (fd < 0) {
2219                 VHOST_LOG_CONFIG(ERR,
2220                                 "Invalid file descriptor for slave channel (%d)\n",
2221                                 fd);
2222                 return RTE_VHOST_MSG_RESULT_ERR;
2223         }
2224
2225         if (dev->slave_req_fd >= 0)
2226                 close(dev->slave_req_fd);
2227
2228         dev->slave_req_fd = fd;
2229
2230         return RTE_VHOST_MSG_RESULT_OK;
2231 }
2232
2233 static int
2234 is_vring_iotlb_split(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2235 {
2236         struct vhost_vring_addr *ra;
2237         uint64_t start, end, len;
2238
2239         start = imsg->iova;
2240         end = start + imsg->size;
2241
2242         ra = &vq->ring_addrs;
2243         len = sizeof(struct vring_desc) * vq->size;
2244         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2245                 return 1;
2246
2247         len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size;
2248         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2249                 return 1;
2250
2251         len = sizeof(struct vring_used) +
2252                sizeof(struct vring_used_elem) * vq->size;
2253         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2254                 return 1;
2255
2256         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2257                 len = sizeof(uint64_t);
2258                 if (ra->log_guest_addr < end &&
2259                     (ra->log_guest_addr + len) > start)
2260                         return 1;
2261         }
2262
2263         return 0;
2264 }
2265
2266 static int
2267 is_vring_iotlb_packed(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg)
2268 {
2269         struct vhost_vring_addr *ra;
2270         uint64_t start, end, len;
2271
2272         start = imsg->iova;
2273         end = start + imsg->size;
2274
2275         ra = &vq->ring_addrs;
2276         len = sizeof(struct vring_packed_desc) * vq->size;
2277         if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start)
2278                 return 1;
2279
2280         len = sizeof(struct vring_packed_desc_event);
2281         if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start)
2282                 return 1;
2283
2284         len = sizeof(struct vring_packed_desc_event);
2285         if (ra->used_user_addr < end && (ra->used_user_addr + len) > start)
2286                 return 1;
2287
2288         if (ra->flags & (1 << VHOST_VRING_F_LOG)) {
2289                 len = sizeof(uint64_t);
2290                 if (ra->log_guest_addr < end &&
2291                     (ra->log_guest_addr + len) > start)
2292                         return 1;
2293         }
2294
2295         return 0;
2296 }
2297
2298 static int is_vring_iotlb(struct virtio_net *dev,
2299                           struct vhost_virtqueue *vq,
2300                           struct vhost_iotlb_msg *imsg)
2301 {
2302         if (vq_is_packed(dev))
2303                 return is_vring_iotlb_packed(vq, imsg);
2304         else
2305                 return is_vring_iotlb_split(vq, imsg);
2306 }
2307
2308 static int
2309 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg,
2310                         int main_fd __rte_unused)
2311 {
2312         struct virtio_net *dev = *pdev;
2313         struct vhost_iotlb_msg *imsg = &msg->payload.iotlb;
2314         uint16_t i;
2315         uint64_t vva, len;
2316
2317         if (validate_msg_fds(msg, 0) != 0)
2318                 return RTE_VHOST_MSG_RESULT_ERR;
2319
2320         switch (imsg->type) {
2321         case VHOST_IOTLB_UPDATE:
2322                 len = imsg->size;
2323                 vva = qva_to_vva(dev, imsg->uaddr, &len);
2324                 if (!vva)
2325                         return RTE_VHOST_MSG_RESULT_ERR;
2326
2327                 for (i = 0; i < dev->nr_vring; i++) {
2328                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2329
2330                         vhost_user_iotlb_cache_insert(vq, imsg->iova, vva,
2331                                         len, imsg->perm);
2332
2333                         if (is_vring_iotlb(dev, vq, imsg))
2334                                 *pdev = dev = translate_ring_addresses(dev, i);
2335                 }
2336                 break;
2337         case VHOST_IOTLB_INVALIDATE:
2338                 for (i = 0; i < dev->nr_vring; i++) {
2339                         struct vhost_virtqueue *vq = dev->virtqueue[i];
2340
2341                         vhost_user_iotlb_cache_remove(vq, imsg->iova,
2342                                         imsg->size);
2343
2344                         if (is_vring_iotlb(dev, vq, imsg))
2345                                 vring_invalidate(dev, vq);
2346                 }
2347                 break;
2348         default:
2349                 VHOST_LOG_CONFIG(ERR, "Invalid IOTLB message type (%d)\n",
2350                                 imsg->type);
2351                 return RTE_VHOST_MSG_RESULT_ERR;
2352         }
2353
2354         return RTE_VHOST_MSG_RESULT_OK;
2355 }
2356
2357 static int
2358 vhost_user_set_postcopy_advise(struct virtio_net **pdev,
2359                         struct VhostUserMsg *msg,
2360                         int main_fd __rte_unused)
2361 {
2362         struct virtio_net *dev = *pdev;
2363 #ifdef RTE_LIBRTE_VHOST_POSTCOPY
2364         struct uffdio_api api_struct;
2365
2366         if (validate_msg_fds(msg, 0) != 0)
2367                 return RTE_VHOST_MSG_RESULT_ERR;
2368
2369         dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK);
2370
2371         if (dev->postcopy_ufd == -1) {
2372                 VHOST_LOG_CONFIG(ERR, "Userfaultfd not available: %s\n",
2373                         strerror(errno));
2374                 return RTE_VHOST_MSG_RESULT_ERR;
2375         }
2376         api_struct.api = UFFD_API;
2377         api_struct.features = 0;
2378         if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) {
2379                 VHOST_LOG_CONFIG(ERR, "UFFDIO_API ioctl failure: %s\n",
2380                         strerror(errno));
2381                 close(dev->postcopy_ufd);
2382                 dev->postcopy_ufd = -1;
2383                 return RTE_VHOST_MSG_RESULT_ERR;
2384         }
2385         msg->fds[0] = dev->postcopy_ufd;
2386         msg->fd_num = 1;
2387
2388         return RTE_VHOST_MSG_RESULT_REPLY;
2389 #else
2390         dev->postcopy_ufd = -1;
2391         msg->fd_num = 0;
2392
2393         return RTE_VHOST_MSG_RESULT_ERR;
2394 #endif
2395 }
2396
2397 static int
2398 vhost_user_set_postcopy_listen(struct virtio_net **pdev,
2399                         struct VhostUserMsg *msg __rte_unused,
2400                         int main_fd __rte_unused)
2401 {
2402         struct virtio_net *dev = *pdev;
2403
2404         if (validate_msg_fds(msg, 0) != 0)
2405                 return RTE_VHOST_MSG_RESULT_ERR;
2406
2407         if (dev->mem && dev->mem->nregions) {
2408                 VHOST_LOG_CONFIG(ERR,
2409                         "Regions already registered at postcopy-listen\n");
2410                 return RTE_VHOST_MSG_RESULT_ERR;
2411         }
2412         dev->postcopy_listening = 1;
2413
2414         return RTE_VHOST_MSG_RESULT_OK;
2415 }
2416
2417 static int
2418 vhost_user_postcopy_end(struct virtio_net **pdev, struct VhostUserMsg *msg,
2419                         int main_fd __rte_unused)
2420 {
2421         struct virtio_net *dev = *pdev;
2422
2423         if (validate_msg_fds(msg, 0) != 0)
2424                 return RTE_VHOST_MSG_RESULT_ERR;
2425
2426         dev->postcopy_listening = 0;
2427         if (dev->postcopy_ufd >= 0) {
2428                 close(dev->postcopy_ufd);
2429                 dev->postcopy_ufd = -1;
2430         }
2431
2432         msg->payload.u64 = 0;
2433         msg->size = sizeof(msg->payload.u64);
2434         msg->fd_num = 0;
2435
2436         return RTE_VHOST_MSG_RESULT_REPLY;
2437 }
2438
2439 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev,
2440                                         struct VhostUserMsg *msg,
2441                                         int main_fd);
2442 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = {
2443         [VHOST_USER_NONE] = NULL,
2444         [VHOST_USER_GET_FEATURES] = vhost_user_get_features,
2445         [VHOST_USER_SET_FEATURES] = vhost_user_set_features,
2446         [VHOST_USER_SET_OWNER] = vhost_user_set_owner,
2447         [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner,
2448         [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table,
2449         [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base,
2450         [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd,
2451         [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num,
2452         [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr,
2453         [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base,
2454         [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base,
2455         [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick,
2456         [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call,
2457         [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err,
2458         [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features,
2459         [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features,
2460         [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num,
2461         [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable,
2462         [VHOST_USER_SEND_RARP] = vhost_user_send_rarp,
2463         [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu,
2464         [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd,
2465         [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg,
2466         [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise,
2467         [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen,
2468         [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end,
2469         [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd,
2470         [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd,
2471 };
2472
2473 /* return bytes# of read on success or negative val on failure. */
2474 static int
2475 read_vhost_message(int sockfd, struct VhostUserMsg *msg)
2476 {
2477         int ret;
2478
2479         ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE,
2480                 msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num);
2481         if (ret <= 0) {
2482                 return ret;
2483         } else if (ret != VHOST_USER_HDR_SIZE) {
2484                 VHOST_LOG_CONFIG(ERR, "Unexpected header size read\n");
2485                 close_msg_fds(msg);
2486                 return -1;
2487         }
2488
2489         if (msg->size) {
2490                 if (msg->size > sizeof(msg->payload)) {
2491                         VHOST_LOG_CONFIG(ERR,
2492                                 "invalid msg size: %d\n", msg->size);
2493                         return -1;
2494                 }
2495                 ret = read(sockfd, &msg->payload, msg->size);
2496                 if (ret <= 0)
2497                         return ret;
2498                 if (ret != (int)msg->size) {
2499                         VHOST_LOG_CONFIG(ERR,
2500                                 "read control message failed\n");
2501                         return -1;
2502                 }
2503         }
2504
2505         return ret;
2506 }
2507
2508 static int
2509 send_vhost_message(int sockfd, struct VhostUserMsg *msg)
2510 {
2511         if (!msg)
2512                 return 0;
2513
2514         return send_fd_message(sockfd, (char *)msg,
2515                 VHOST_USER_HDR_SIZE + msg->size, msg->fds, msg->fd_num);
2516 }
2517
2518 static int
2519 send_vhost_reply(int sockfd, struct VhostUserMsg *msg)
2520 {
2521         if (!msg)
2522                 return 0;
2523
2524         msg->flags &= ~VHOST_USER_VERSION_MASK;
2525         msg->flags &= ~VHOST_USER_NEED_REPLY;
2526         msg->flags |= VHOST_USER_VERSION;
2527         msg->flags |= VHOST_USER_REPLY_MASK;
2528
2529         return send_vhost_message(sockfd, msg);
2530 }
2531
2532 static int
2533 send_vhost_slave_message(struct virtio_net *dev, struct VhostUserMsg *msg)
2534 {
2535         int ret;
2536
2537         if (msg->flags & VHOST_USER_NEED_REPLY)
2538                 rte_spinlock_lock(&dev->slave_req_lock);
2539
2540         ret = send_vhost_message(dev->slave_req_fd, msg);
2541         if (ret < 0 && (msg->flags & VHOST_USER_NEED_REPLY))
2542                 rte_spinlock_unlock(&dev->slave_req_lock);
2543
2544         return ret;
2545 }
2546
2547 /*
2548  * Allocate a queue pair if it hasn't been allocated yet
2549  */
2550 static int
2551 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev,
2552                         struct VhostUserMsg *msg)
2553 {
2554         uint32_t vring_idx;
2555
2556         switch (msg->request.master) {
2557         case VHOST_USER_SET_VRING_KICK:
2558         case VHOST_USER_SET_VRING_CALL:
2559         case VHOST_USER_SET_VRING_ERR:
2560                 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK;
2561                 break;
2562         case VHOST_USER_SET_VRING_NUM:
2563         case VHOST_USER_SET_VRING_BASE:
2564         case VHOST_USER_SET_VRING_ENABLE:
2565                 vring_idx = msg->payload.state.index;
2566                 break;
2567         case VHOST_USER_SET_VRING_ADDR:
2568                 vring_idx = msg->payload.addr.index;
2569                 break;
2570         default:
2571                 return 0;
2572         }
2573
2574         if (vring_idx >= VHOST_MAX_VRING) {
2575                 VHOST_LOG_CONFIG(ERR,
2576                         "invalid vring index: %u\n", vring_idx);
2577                 return -1;
2578         }
2579
2580         if (dev->virtqueue[vring_idx])
2581                 return 0;
2582
2583         return alloc_vring_queue(dev, vring_idx);
2584 }
2585
2586 static void
2587 vhost_user_lock_all_queue_pairs(struct virtio_net *dev)
2588 {
2589         unsigned int i = 0;
2590         unsigned int vq_num = 0;
2591
2592         while (vq_num < dev->nr_vring) {
2593                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2594
2595                 if (vq) {
2596                         rte_spinlock_lock(&vq->access_lock);
2597                         vq_num++;
2598                 }
2599                 i++;
2600         }
2601 }
2602
2603 static void
2604 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev)
2605 {
2606         unsigned int i = 0;
2607         unsigned int vq_num = 0;
2608
2609         while (vq_num < dev->nr_vring) {
2610                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2611
2612                 if (vq) {
2613                         rte_spinlock_unlock(&vq->access_lock);
2614                         vq_num++;
2615                 }
2616                 i++;
2617         }
2618 }
2619
2620 int
2621 vhost_user_msg_handler(int vid, int fd)
2622 {
2623         struct virtio_net *dev;
2624         struct VhostUserMsg msg;
2625         struct rte_vdpa_device *vdpa_dev;
2626         int ret;
2627         int unlock_required = 0;
2628         bool handled;
2629         int request;
2630         uint32_t i;
2631
2632         dev = get_device(vid);
2633         if (dev == NULL)
2634                 return -1;
2635
2636         if (!dev->notify_ops) {
2637                 dev->notify_ops = vhost_driver_callback_get(dev->ifname);
2638                 if (!dev->notify_ops) {
2639                         VHOST_LOG_CONFIG(ERR,
2640                                 "failed to get callback ops for driver %s\n",
2641                                 dev->ifname);
2642                         return -1;
2643                 }
2644         }
2645
2646         ret = read_vhost_message(fd, &msg);
2647         if (ret <= 0) {
2648                 if (ret < 0)
2649                         VHOST_LOG_CONFIG(ERR,
2650                                 "vhost read message failed\n");
2651                 else
2652                         VHOST_LOG_CONFIG(INFO,
2653                                 "vhost peer closed\n");
2654
2655                 return -1;
2656         }
2657
2658         ret = 0;
2659         request = msg.request.master;
2660         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX &&
2661                         vhost_message_str[request]) {
2662                 if (request != VHOST_USER_IOTLB_MSG)
2663                         VHOST_LOG_CONFIG(INFO, "read message %s\n",
2664                                 vhost_message_str[request]);
2665                 else
2666                         VHOST_LOG_CONFIG(DEBUG, "read message %s\n",
2667                                 vhost_message_str[request]);
2668         } else {
2669                 VHOST_LOG_CONFIG(DEBUG, "External request %d\n", request);
2670         }
2671
2672         ret = vhost_user_check_and_alloc_queue_pair(dev, &msg);
2673         if (ret < 0) {
2674                 VHOST_LOG_CONFIG(ERR,
2675                         "failed to alloc queue\n");
2676                 return -1;
2677         }
2678
2679         /*
2680          * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE
2681          * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops
2682          * and device is destroyed. destroy_device waits for queues to be
2683          * inactive, so it is safe. Otherwise taking the access_lock
2684          * would cause a dead lock.
2685          */
2686         switch (request) {
2687         case VHOST_USER_SET_FEATURES:
2688         case VHOST_USER_SET_PROTOCOL_FEATURES:
2689         case VHOST_USER_SET_OWNER:
2690         case VHOST_USER_SET_MEM_TABLE:
2691         case VHOST_USER_SET_LOG_BASE:
2692         case VHOST_USER_SET_LOG_FD:
2693         case VHOST_USER_SET_VRING_NUM:
2694         case VHOST_USER_SET_VRING_ADDR:
2695         case VHOST_USER_SET_VRING_BASE:
2696         case VHOST_USER_SET_VRING_KICK:
2697         case VHOST_USER_SET_VRING_CALL:
2698         case VHOST_USER_SET_VRING_ERR:
2699         case VHOST_USER_SET_VRING_ENABLE:
2700         case VHOST_USER_SEND_RARP:
2701         case VHOST_USER_NET_SET_MTU:
2702         case VHOST_USER_SET_SLAVE_REQ_FD:
2703                 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
2704                         vhost_user_lock_all_queue_pairs(dev);
2705                         unlock_required = 1;
2706                 }
2707                 break;
2708         default:
2709                 break;
2710
2711         }
2712
2713         handled = false;
2714         if (dev->extern_ops.pre_msg_handle) {
2715                 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid,
2716                                 (void *)&msg);
2717                 switch (ret) {
2718                 case RTE_VHOST_MSG_RESULT_REPLY:
2719                         send_vhost_reply(fd, &msg);
2720                         /* Fall-through */
2721                 case RTE_VHOST_MSG_RESULT_ERR:
2722                 case RTE_VHOST_MSG_RESULT_OK:
2723                         handled = true;
2724                         goto skip_to_post_handle;
2725                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2726                 default:
2727                         break;
2728                 }
2729         }
2730
2731         if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) {
2732                 if (!vhost_message_handlers[request])
2733                         goto skip_to_post_handle;
2734                 ret = vhost_message_handlers[request](&dev, &msg, fd);
2735
2736                 switch (ret) {
2737                 case RTE_VHOST_MSG_RESULT_ERR:
2738                         VHOST_LOG_CONFIG(ERR,
2739                                 "Processing %s failed.\n",
2740                                 vhost_message_str[request]);
2741                         handled = true;
2742                         break;
2743                 case RTE_VHOST_MSG_RESULT_OK:
2744                         VHOST_LOG_CONFIG(DEBUG,
2745                                 "Processing %s succeeded.\n",
2746                                 vhost_message_str[request]);
2747                         handled = true;
2748                         break;
2749                 case RTE_VHOST_MSG_RESULT_REPLY:
2750                         VHOST_LOG_CONFIG(DEBUG,
2751                                 "Processing %s succeeded and needs reply.\n",
2752                                 vhost_message_str[request]);
2753                         send_vhost_reply(fd, &msg);
2754                         handled = true;
2755                         break;
2756                 default:
2757                         break;
2758                 }
2759         }
2760
2761 skip_to_post_handle:
2762         if (ret != RTE_VHOST_MSG_RESULT_ERR &&
2763                         dev->extern_ops.post_msg_handle) {
2764                 ret = (*dev->extern_ops.post_msg_handle)(dev->vid,
2765                                 (void *)&msg);
2766                 switch (ret) {
2767                 case RTE_VHOST_MSG_RESULT_REPLY:
2768                         send_vhost_reply(fd, &msg);
2769                         /* Fall-through */
2770                 case RTE_VHOST_MSG_RESULT_ERR:
2771                 case RTE_VHOST_MSG_RESULT_OK:
2772                         handled = true;
2773                 case RTE_VHOST_MSG_RESULT_NOT_HANDLED:
2774                 default:
2775                         break;
2776                 }
2777         }
2778
2779         if (unlock_required)
2780                 vhost_user_unlock_all_queue_pairs(dev);
2781
2782         /* If message was not handled at this stage, treat it as an error */
2783         if (!handled) {
2784                 VHOST_LOG_CONFIG(ERR,
2785                         "vhost message (req: %d) was not handled.\n", request);
2786                 close_msg_fds(&msg);
2787                 ret = RTE_VHOST_MSG_RESULT_ERR;
2788         }
2789
2790         /*
2791          * If the request required a reply that was already sent,
2792          * this optional reply-ack won't be sent as the
2793          * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply().
2794          */
2795         if (msg.flags & VHOST_USER_NEED_REPLY) {
2796                 msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR;
2797                 msg.size = sizeof(msg.payload.u64);
2798                 msg.fd_num = 0;
2799                 send_vhost_reply(fd, &msg);
2800         } else if (ret == RTE_VHOST_MSG_RESULT_ERR) {
2801                 VHOST_LOG_CONFIG(ERR,
2802                         "vhost message handling failed.\n");
2803                 return -1;
2804         }
2805
2806         for (i = 0; i < dev->nr_vring; i++) {
2807                 struct vhost_virtqueue *vq = dev->virtqueue[i];
2808                 bool cur_ready = vq_is_ready(dev, vq);
2809
2810                 if (cur_ready != (vq && vq->ready)) {
2811                         vhost_user_notify_queue_state(dev, i, cur_ready);
2812                         vq->ready = cur_ready;
2813                 }
2814         }
2815
2816
2817         if (!(dev->flags & VIRTIO_DEV_RUNNING) && virtio_is_ready(dev)) {
2818                 dev->flags |= VIRTIO_DEV_READY;
2819
2820                 if (!(dev->flags & VIRTIO_DEV_RUNNING)) {
2821                         if (dev->dequeue_zero_copy) {
2822                                 VHOST_LOG_CONFIG(INFO,
2823                                                 "dequeue zero copy is enabled\n");
2824                         }
2825
2826                         if (dev->notify_ops->new_device(dev->vid) == 0)
2827                                 dev->flags |= VIRTIO_DEV_RUNNING;
2828                 }
2829         }
2830
2831         vdpa_dev = dev->vdpa_dev;
2832         if (vdpa_dev && virtio_is_ready(dev) &&
2833             !(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) {
2834                 if (vdpa_dev->ops->dev_conf)
2835                         vdpa_dev->ops->dev_conf(dev->vid);
2836                 dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED;
2837         }
2838
2839         return 0;
2840 }
2841
2842 static int process_slave_message_reply(struct virtio_net *dev,
2843                                        const struct VhostUserMsg *msg)
2844 {
2845         struct VhostUserMsg msg_reply;
2846         int ret;
2847
2848         if ((msg->flags & VHOST_USER_NEED_REPLY) == 0)
2849                 return 0;
2850
2851         ret = read_vhost_message(dev->slave_req_fd, &msg_reply);
2852         if (ret <= 0) {
2853                 if (ret < 0)
2854                         VHOST_LOG_CONFIG(ERR,
2855                                 "vhost read slave message reply failed\n");
2856                 else
2857                         VHOST_LOG_CONFIG(INFO,
2858                                 "vhost peer closed\n");
2859                 ret = -1;
2860                 goto out;
2861         }
2862
2863         ret = 0;
2864         if (msg_reply.request.slave != msg->request.slave) {
2865                 VHOST_LOG_CONFIG(ERR,
2866                         "Received unexpected msg type (%u), expected %u\n",
2867                         msg_reply.request.slave, msg->request.slave);
2868                 ret = -1;
2869                 goto out;
2870         }
2871
2872         ret = msg_reply.payload.u64 ? -1 : 0;
2873
2874 out:
2875         rte_spinlock_unlock(&dev->slave_req_lock);
2876         return ret;
2877 }
2878
2879 int
2880 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm)
2881 {
2882         int ret;
2883         struct VhostUserMsg msg = {
2884                 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG,
2885                 .flags = VHOST_USER_VERSION,
2886                 .size = sizeof(msg.payload.iotlb),
2887                 .payload.iotlb = {
2888                         .iova = iova,
2889                         .perm = perm,
2890                         .type = VHOST_IOTLB_MISS,
2891                 },
2892         };
2893
2894         ret = send_vhost_message(dev->slave_req_fd, &msg);
2895         if (ret < 0) {
2896                 VHOST_LOG_CONFIG(ERR,
2897                                 "Failed to send IOTLB miss message (%d)\n",
2898                                 ret);
2899                 return ret;
2900         }
2901
2902         return 0;
2903 }
2904
2905 static int
2906 vhost_user_slave_config_change(struct virtio_net *dev, bool need_reply)
2907 {
2908         int ret;
2909         struct VhostUserMsg msg = {
2910                 .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG,
2911                 .flags = VHOST_USER_VERSION,
2912                 .size = 0,
2913         };
2914
2915         if (need_reply)
2916                 msg.flags |= VHOST_USER_NEED_REPLY;
2917
2918         ret = send_vhost_slave_message(dev, &msg);
2919         if (ret < 0) {
2920                 VHOST_LOG_CONFIG(ERR,
2921                                 "Failed to send config change (%d)\n",
2922                                 ret);
2923                 return ret;
2924         }
2925
2926         return process_slave_message_reply(dev, &msg);
2927 }
2928
2929 int
2930 rte_vhost_slave_config_change(int vid, bool need_reply)
2931 {
2932         struct virtio_net *dev;
2933
2934         dev = get_device(vid);
2935         if (!dev)
2936                 return -ENODEV;
2937
2938         return vhost_user_slave_config_change(dev, need_reply);
2939 }
2940
2941 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev,
2942                                                     int index, int fd,
2943                                                     uint64_t offset,
2944                                                     uint64_t size)
2945 {
2946         int ret;
2947         struct VhostUserMsg msg = {
2948                 .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG,
2949                 .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY,
2950                 .size = sizeof(msg.payload.area),
2951                 .payload.area = {
2952                         .u64 = index & VHOST_USER_VRING_IDX_MASK,
2953                         .size = size,
2954                         .offset = offset,
2955                 },
2956         };
2957
2958         if (fd < 0)
2959                 msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK;
2960         else {
2961                 msg.fds[0] = fd;
2962                 msg.fd_num = 1;
2963         }
2964
2965         ret = send_vhost_slave_message(dev, &msg);
2966         if (ret < 0) {
2967                 VHOST_LOG_CONFIG(ERR,
2968                         "Failed to set host notifier (%d)\n", ret);
2969                 return ret;
2970         }
2971
2972         return process_slave_message_reply(dev, &msg);
2973 }
2974
2975 int rte_vhost_host_notifier_ctrl(int vid, uint16_t qid, bool enable)
2976 {
2977         struct virtio_net *dev;
2978         struct rte_vdpa_device *vdpa_dev;
2979         int vfio_device_fd, ret = 0;
2980         uint64_t offset, size;
2981         unsigned int i, q_start, q_last;
2982
2983         dev = get_device(vid);
2984         if (!dev)
2985                 return -ENODEV;
2986
2987         vdpa_dev = dev->vdpa_dev;
2988         if (vdpa_dev == NULL)
2989                 return -ENODEV;
2990
2991         if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) ||
2992             !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) ||
2993             !(dev->protocol_features &
2994                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) ||
2995             !(dev->protocol_features &
2996                         (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) ||
2997             !(dev->protocol_features &
2998                         (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER)))
2999                 return -ENOTSUP;
3000
3001         if (qid == RTE_VHOST_QUEUE_ALL) {
3002                 q_start = 0;
3003                 q_last = dev->nr_vring - 1;
3004         } else {
3005                 if (qid >= dev->nr_vring)
3006                         return -EINVAL;
3007                 q_start = qid;
3008                 q_last = qid;
3009         }
3010
3011         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP);
3012         RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP);
3013
3014         vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid);
3015         if (vfio_device_fd < 0)
3016                 return -ENOTSUP;
3017
3018         if (enable) {
3019                 for (i = q_start; i <= q_last; i++) {
3020                         if (vdpa_dev->ops->get_notify_area(vid, i, &offset,
3021                                         &size) < 0) {
3022                                 ret = -ENOTSUP;
3023                                 goto disable;
3024                         }
3025
3026                         if (vhost_user_slave_set_vring_host_notifier(dev, i,
3027                                         vfio_device_fd, offset, size) < 0) {
3028                                 ret = -EFAULT;
3029                                 goto disable;
3030                         }
3031                 }
3032         } else {
3033 disable:
3034                 for (i = q_start; i <= q_last; i++) {
3035                         vhost_user_slave_set_vring_host_notifier(dev, i, -1,
3036                                         0, 0);
3037                 }
3038         }
3039
3040         return ret;
3041 }