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 [VHOST_USER_SET_STATUS] = "VHOST_USER_SET_STATUS", 91 [VHOST_USER_GET_STATUS] = "VHOST_USER_GET_STATUS", 92 }; 93 94 static int send_vhost_reply(int sockfd, struct VhostUserMsg *msg); 95 static int read_vhost_message(int sockfd, struct VhostUserMsg *msg); 96 97 static void 98 close_msg_fds(struct VhostUserMsg *msg) 99 { 100 int i; 101 102 for (i = 0; i < msg->fd_num; i++) { 103 int fd = msg->fds[i]; 104 105 if (fd == -1) 106 continue; 107 108 msg->fds[i] = -1; 109 close(fd); 110 } 111 } 112 113 /* 114 * Ensure the expected number of FDs is received, 115 * close all FDs and return an error if this is not the case. 116 */ 117 static int 118 validate_msg_fds(struct VhostUserMsg *msg, int expected_fds) 119 { 120 if (msg->fd_num == expected_fds) 121 return 0; 122 123 VHOST_LOG_CONFIG(ERR, 124 " Expect %d FDs for request %s, received %d\n", 125 expected_fds, 126 vhost_message_str[msg->request.master], 127 msg->fd_num); 128 129 close_msg_fds(msg); 130 131 return -1; 132 } 133 134 static uint64_t 135 get_blk_size(int fd) 136 { 137 struct stat stat; 138 int ret; 139 140 ret = fstat(fd, &stat); 141 return ret == -1 ? (uint64_t)-1 : (uint64_t)stat.st_blksize; 142 } 143 144 static void 145 free_mem_region(struct virtio_net *dev) 146 { 147 uint32_t i; 148 struct rte_vhost_mem_region *reg; 149 150 if (!dev || !dev->mem) 151 return; 152 153 for (i = 0; i < dev->mem->nregions; i++) { 154 reg = &dev->mem->regions[i]; 155 if (reg->host_user_addr) { 156 munmap(reg->mmap_addr, reg->mmap_size); 157 close(reg->fd); 158 } 159 } 160 } 161 162 void 163 vhost_backend_cleanup(struct virtio_net *dev) 164 { 165 if (dev->mem) { 166 free_mem_region(dev); 167 rte_free(dev->mem); 168 dev->mem = NULL; 169 } 170 171 rte_free(dev->guest_pages); 172 dev->guest_pages = NULL; 173 174 if (dev->log_addr) { 175 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); 176 dev->log_addr = 0; 177 } 178 179 if (dev->inflight_info) { 180 if (dev->inflight_info->addr) { 181 munmap(dev->inflight_info->addr, 182 dev->inflight_info->size); 183 dev->inflight_info->addr = NULL; 184 } 185 186 if (dev->inflight_info->fd >= 0) { 187 close(dev->inflight_info->fd); 188 dev->inflight_info->fd = -1; 189 } 190 191 free(dev->inflight_info); 192 dev->inflight_info = NULL; 193 } 194 195 if (dev->slave_req_fd >= 0) { 196 close(dev->slave_req_fd); 197 dev->slave_req_fd = -1; 198 } 199 200 if (dev->postcopy_ufd >= 0) { 201 close(dev->postcopy_ufd); 202 dev->postcopy_ufd = -1; 203 } 204 205 dev->postcopy_listening = 0; 206 } 207 208 static void 209 vhost_user_notify_queue_state(struct virtio_net *dev, uint16_t index, 210 int enable) 211 { 212 struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev; 213 struct vhost_virtqueue *vq = dev->virtqueue[index]; 214 215 /* Configure guest notifications on enable */ 216 if (enable && vq->notif_enable != VIRTIO_UNINITIALIZED_NOTIF) 217 vhost_enable_guest_notification(dev, vq, vq->notif_enable); 218 219 if (vdpa_dev && vdpa_dev->ops->set_vring_state) 220 vdpa_dev->ops->set_vring_state(dev->vid, index, enable); 221 222 if (dev->notify_ops->vring_state_changed) 223 dev->notify_ops->vring_state_changed(dev->vid, 224 index, enable); 225 } 226 227 /* 228 * This function just returns success at the moment unless 229 * the device hasn't been initialised. 230 */ 231 static int 232 vhost_user_set_owner(struct virtio_net **pdev __rte_unused, 233 struct VhostUserMsg *msg, 234 int main_fd __rte_unused) 235 { 236 if (validate_msg_fds(msg, 0) != 0) 237 return RTE_VHOST_MSG_RESULT_ERR; 238 239 return RTE_VHOST_MSG_RESULT_OK; 240 } 241 242 static int 243 vhost_user_reset_owner(struct virtio_net **pdev, 244 struct VhostUserMsg *msg, 245 int main_fd __rte_unused) 246 { 247 struct virtio_net *dev = *pdev; 248 249 if (validate_msg_fds(msg, 0) != 0) 250 return RTE_VHOST_MSG_RESULT_ERR; 251 252 vhost_destroy_device_notify(dev); 253 254 cleanup_device(dev, 0); 255 reset_device(dev); 256 return RTE_VHOST_MSG_RESULT_OK; 257 } 258 259 /* 260 * The features that we support are requested. 261 */ 262 static int 263 vhost_user_get_features(struct virtio_net **pdev, struct VhostUserMsg *msg, 264 int main_fd __rte_unused) 265 { 266 struct virtio_net *dev = *pdev; 267 uint64_t features = 0; 268 269 if (validate_msg_fds(msg, 0) != 0) 270 return RTE_VHOST_MSG_RESULT_ERR; 271 272 rte_vhost_driver_get_features(dev->ifname, &features); 273 274 msg->payload.u64 = features; 275 msg->size = sizeof(msg->payload.u64); 276 msg->fd_num = 0; 277 278 return RTE_VHOST_MSG_RESULT_REPLY; 279 } 280 281 /* 282 * The queue number that we support are requested. 283 */ 284 static int 285 vhost_user_get_queue_num(struct virtio_net **pdev, struct VhostUserMsg *msg, 286 int main_fd __rte_unused) 287 { 288 struct virtio_net *dev = *pdev; 289 uint32_t queue_num = 0; 290 291 if (validate_msg_fds(msg, 0) != 0) 292 return RTE_VHOST_MSG_RESULT_ERR; 293 294 rte_vhost_driver_get_queue_num(dev->ifname, &queue_num); 295 296 msg->payload.u64 = (uint64_t)queue_num; 297 msg->size = sizeof(msg->payload.u64); 298 msg->fd_num = 0; 299 300 return RTE_VHOST_MSG_RESULT_REPLY; 301 } 302 303 /* 304 * We receive the negotiated features supported by us and the virtio device. 305 */ 306 static int 307 vhost_user_set_features(struct virtio_net **pdev, struct VhostUserMsg *msg, 308 int main_fd __rte_unused) 309 { 310 struct virtio_net *dev = *pdev; 311 uint64_t features = msg->payload.u64; 312 uint64_t vhost_features = 0; 313 struct rte_vdpa_device *vdpa_dev; 314 315 if (validate_msg_fds(msg, 0) != 0) 316 return RTE_VHOST_MSG_RESULT_ERR; 317 318 rte_vhost_driver_get_features(dev->ifname, &vhost_features); 319 if (features & ~vhost_features) { 320 VHOST_LOG_CONFIG(ERR, 321 "(%d) received invalid negotiated features.\n", 322 dev->vid); 323 dev->flags |= VIRTIO_DEV_FEATURES_FAILED; 324 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK; 325 326 return RTE_VHOST_MSG_RESULT_ERR; 327 } 328 329 if (dev->flags & VIRTIO_DEV_RUNNING) { 330 if (dev->features == features) 331 return RTE_VHOST_MSG_RESULT_OK; 332 333 /* 334 * Error out if master tries to change features while device is 335 * in running state. The exception being VHOST_F_LOG_ALL, which 336 * is enabled when the live-migration starts. 337 */ 338 if ((dev->features ^ features) & ~(1ULL << VHOST_F_LOG_ALL)) { 339 VHOST_LOG_CONFIG(ERR, 340 "(%d) features changed while device is running.\n", 341 dev->vid); 342 return RTE_VHOST_MSG_RESULT_ERR; 343 } 344 345 if (dev->notify_ops->features_changed) 346 dev->notify_ops->features_changed(dev->vid, features); 347 } 348 349 dev->features = features; 350 if (dev->features & 351 ((1ULL << VIRTIO_NET_F_MRG_RXBUF) | 352 (1ULL << VIRTIO_F_VERSION_1) | 353 (1ULL << VIRTIO_F_RING_PACKED))) { 354 dev->vhost_hlen = sizeof(struct virtio_net_hdr_mrg_rxbuf); 355 } else { 356 dev->vhost_hlen = sizeof(struct virtio_net_hdr); 357 } 358 VHOST_LOG_CONFIG(INFO, 359 "negotiated Virtio features: 0x%" PRIx64 "\n", dev->features); 360 VHOST_LOG_CONFIG(DEBUG, 361 "(%d) mergeable RX buffers %s, virtio 1 %s\n", 362 dev->vid, 363 (dev->features & (1 << VIRTIO_NET_F_MRG_RXBUF)) ? "on" : "off", 364 (dev->features & (1ULL << VIRTIO_F_VERSION_1)) ? "on" : "off"); 365 366 if ((dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) && 367 !(dev->features & (1ULL << VIRTIO_NET_F_MQ))) { 368 /* 369 * Remove all but first queue pair if MQ hasn't been 370 * negotiated. This is safe because the device is not 371 * running at this stage. 372 */ 373 while (dev->nr_vring > 2) { 374 struct vhost_virtqueue *vq; 375 376 vq = dev->virtqueue[--dev->nr_vring]; 377 if (!vq) 378 continue; 379 380 dev->virtqueue[dev->nr_vring] = NULL; 381 cleanup_vq(vq, 1); 382 cleanup_vq_inflight(dev, vq); 383 free_vq(dev, vq); 384 } 385 } 386 387 vdpa_dev = dev->vdpa_dev; 388 if (vdpa_dev) 389 vdpa_dev->ops->set_features(dev->vid); 390 391 dev->flags &= ~VIRTIO_DEV_FEATURES_FAILED; 392 return RTE_VHOST_MSG_RESULT_OK; 393 } 394 395 /* 396 * The virtio device sends us the size of the descriptor ring. 397 */ 398 static int 399 vhost_user_set_vring_num(struct virtio_net **pdev, 400 struct VhostUserMsg *msg, 401 int main_fd __rte_unused) 402 { 403 struct virtio_net *dev = *pdev; 404 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; 405 406 if (validate_msg_fds(msg, 0) != 0) 407 return RTE_VHOST_MSG_RESULT_ERR; 408 409 if (msg->payload.state.num > 32768) { 410 VHOST_LOG_CONFIG(ERR, "invalid virtqueue size %u\n", msg->payload.state.num); 411 return RTE_VHOST_MSG_RESULT_ERR; 412 } 413 414 vq->size = msg->payload.state.num; 415 416 /* VIRTIO 1.0, 2.4 Virtqueues says: 417 * 418 * Queue Size value is always a power of 2. The maximum Queue Size 419 * value is 32768. 420 * 421 * VIRTIO 1.1 2.7 Virtqueues says: 422 * 423 * Packed virtqueues support up to 2^15 entries each. 424 */ 425 if (!vq_is_packed(dev)) { 426 if (vq->size & (vq->size - 1)) { 427 VHOST_LOG_CONFIG(ERR, 428 "invalid virtqueue size %u\n", vq->size); 429 return RTE_VHOST_MSG_RESULT_ERR; 430 } 431 } 432 433 if (vq_is_packed(dev)) { 434 if (vq->shadow_used_packed) 435 rte_free(vq->shadow_used_packed); 436 vq->shadow_used_packed = rte_malloc(NULL, 437 vq->size * 438 sizeof(struct vring_used_elem_packed), 439 RTE_CACHE_LINE_SIZE); 440 if (!vq->shadow_used_packed) { 441 VHOST_LOG_CONFIG(ERR, 442 "failed to allocate memory for shadow used ring.\n"); 443 return RTE_VHOST_MSG_RESULT_ERR; 444 } 445 446 } else { 447 if (vq->shadow_used_split) 448 rte_free(vq->shadow_used_split); 449 450 vq->shadow_used_split = rte_malloc(NULL, 451 vq->size * sizeof(struct vring_used_elem), 452 RTE_CACHE_LINE_SIZE); 453 454 if (!vq->shadow_used_split) { 455 VHOST_LOG_CONFIG(ERR, 456 "failed to allocate memory for vq internal data.\n"); 457 return RTE_VHOST_MSG_RESULT_ERR; 458 } 459 } 460 461 if (vq->batch_copy_elems) 462 rte_free(vq->batch_copy_elems); 463 vq->batch_copy_elems = rte_malloc(NULL, 464 vq->size * sizeof(struct batch_copy_elem), 465 RTE_CACHE_LINE_SIZE); 466 if (!vq->batch_copy_elems) { 467 VHOST_LOG_CONFIG(ERR, 468 "failed to allocate memory for batching copy.\n"); 469 return RTE_VHOST_MSG_RESULT_ERR; 470 } 471 472 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) { 473 if (vhost_user_iotlb_init(dev, msg->payload.state.index)) 474 return RTE_VHOST_MSG_RESULT_ERR; 475 } 476 return RTE_VHOST_MSG_RESULT_OK; 477 } 478 479 /* 480 * Reallocate virtio_dev and vhost_virtqueue data structure to make them on the 481 * same numa node as the memory of vring descriptor. 482 */ 483 #ifdef RTE_LIBRTE_VHOST_NUMA 484 static struct virtio_net* 485 numa_realloc(struct virtio_net *dev, int index) 486 { 487 int oldnode, newnode; 488 struct virtio_net *old_dev; 489 struct vhost_virtqueue *old_vq, *vq; 490 struct vring_used_elem *new_shadow_used_split; 491 struct vring_used_elem_packed *new_shadow_used_packed; 492 struct batch_copy_elem *new_batch_copy_elems; 493 int ret; 494 495 if (dev->flags & VIRTIO_DEV_RUNNING) 496 return dev; 497 498 old_dev = dev; 499 vq = old_vq = dev->virtqueue[index]; 500 501 ret = get_mempolicy(&newnode, NULL, 0, old_vq->desc, 502 MPOL_F_NODE | MPOL_F_ADDR); 503 504 /* check if we need to reallocate vq */ 505 ret |= get_mempolicy(&oldnode, NULL, 0, old_vq, 506 MPOL_F_NODE | MPOL_F_ADDR); 507 if (ret) { 508 VHOST_LOG_CONFIG(ERR, 509 "Unable to get vq numa information.\n"); 510 return dev; 511 } 512 if (oldnode != newnode) { 513 VHOST_LOG_CONFIG(INFO, 514 "reallocate vq from %d to %d node\n", oldnode, newnode); 515 vq = rte_malloc_socket(NULL, sizeof(*vq), 0, newnode); 516 if (!vq) 517 return dev; 518 519 memcpy(vq, old_vq, sizeof(*vq)); 520 521 if (vq_is_packed(dev)) { 522 new_shadow_used_packed = rte_malloc_socket(NULL, 523 vq->size * 524 sizeof(struct vring_used_elem_packed), 525 RTE_CACHE_LINE_SIZE, 526 newnode); 527 if (new_shadow_used_packed) { 528 rte_free(vq->shadow_used_packed); 529 vq->shadow_used_packed = new_shadow_used_packed; 530 } 531 } else { 532 new_shadow_used_split = rte_malloc_socket(NULL, 533 vq->size * 534 sizeof(struct vring_used_elem), 535 RTE_CACHE_LINE_SIZE, 536 newnode); 537 if (new_shadow_used_split) { 538 rte_free(vq->shadow_used_split); 539 vq->shadow_used_split = new_shadow_used_split; 540 } 541 } 542 543 new_batch_copy_elems = rte_malloc_socket(NULL, 544 vq->size * sizeof(struct batch_copy_elem), 545 RTE_CACHE_LINE_SIZE, 546 newnode); 547 if (new_batch_copy_elems) { 548 rte_free(vq->batch_copy_elems); 549 vq->batch_copy_elems = new_batch_copy_elems; 550 } 551 552 rte_free(old_vq); 553 } 554 555 /* check if we need to reallocate dev */ 556 ret = get_mempolicy(&oldnode, NULL, 0, old_dev, 557 MPOL_F_NODE | MPOL_F_ADDR); 558 if (ret) { 559 VHOST_LOG_CONFIG(ERR, 560 "Unable to get dev numa information.\n"); 561 goto out; 562 } 563 if (oldnode != newnode) { 564 VHOST_LOG_CONFIG(INFO, 565 "reallocate dev from %d to %d node\n", 566 oldnode, newnode); 567 dev = rte_malloc_socket(NULL, sizeof(*dev), 0, newnode); 568 if (!dev) { 569 dev = old_dev; 570 goto out; 571 } 572 573 memcpy(dev, old_dev, sizeof(*dev)); 574 rte_free(old_dev); 575 } 576 577 out: 578 dev->virtqueue[index] = vq; 579 vhost_devices[dev->vid] = dev; 580 581 if (old_vq != vq && (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM))) 582 vhost_user_iotlb_init(dev, index); 583 584 return dev; 585 } 586 #else 587 static struct virtio_net* 588 numa_realloc(struct virtio_net *dev, int index __rte_unused) 589 { 590 return dev; 591 } 592 #endif 593 594 /* Converts QEMU virtual address to Vhost virtual address. */ 595 static uint64_t 596 qva_to_vva(struct virtio_net *dev, uint64_t qva, uint64_t *len) 597 { 598 struct rte_vhost_mem_region *r; 599 uint32_t i; 600 601 if (unlikely(!dev || !dev->mem)) 602 goto out_error; 603 604 /* Find the region where the address lives. */ 605 for (i = 0; i < dev->mem->nregions; i++) { 606 r = &dev->mem->regions[i]; 607 608 if (qva >= r->guest_user_addr && 609 qva < r->guest_user_addr + r->size) { 610 611 if (unlikely(*len > r->guest_user_addr + r->size - qva)) 612 *len = r->guest_user_addr + r->size - qva; 613 614 return qva - r->guest_user_addr + 615 r->host_user_addr; 616 } 617 } 618 out_error: 619 *len = 0; 620 621 return 0; 622 } 623 624 625 /* 626 * Converts ring address to Vhost virtual address. 627 * If IOMMU is enabled, the ring address is a guest IO virtual address, 628 * else it is a QEMU virtual address. 629 */ 630 static uint64_t 631 ring_addr_to_vva(struct virtio_net *dev, struct vhost_virtqueue *vq, 632 uint64_t ra, uint64_t *size) 633 { 634 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) { 635 uint64_t vva; 636 637 vhost_user_iotlb_rd_lock(vq); 638 vva = vhost_iova_to_vva(dev, vq, ra, 639 size, VHOST_ACCESS_RW); 640 vhost_user_iotlb_rd_unlock(vq); 641 642 return vva; 643 } 644 645 return qva_to_vva(dev, ra, size); 646 } 647 648 static uint64_t 649 log_addr_to_gpa(struct virtio_net *dev, struct vhost_virtqueue *vq) 650 { 651 uint64_t log_gpa; 652 653 vhost_user_iotlb_rd_lock(vq); 654 log_gpa = translate_log_addr(dev, vq, vq->ring_addrs.log_guest_addr); 655 vhost_user_iotlb_rd_unlock(vq); 656 657 return log_gpa; 658 } 659 660 static struct virtio_net * 661 translate_ring_addresses(struct virtio_net *dev, int vq_index) 662 { 663 struct vhost_virtqueue *vq = dev->virtqueue[vq_index]; 664 struct vhost_vring_addr *addr = &vq->ring_addrs; 665 uint64_t len, expected_len; 666 667 if (addr->flags & (1 << VHOST_VRING_F_LOG)) { 668 vq->log_guest_addr = 669 log_addr_to_gpa(dev, vq); 670 if (vq->log_guest_addr == 0) { 671 VHOST_LOG_CONFIG(DEBUG, 672 "(%d) failed to map log_guest_addr.\n", 673 dev->vid); 674 return dev; 675 } 676 } 677 678 if (vq_is_packed(dev)) { 679 len = sizeof(struct vring_packed_desc) * vq->size; 680 vq->desc_packed = (struct vring_packed_desc *)(uintptr_t) 681 ring_addr_to_vva(dev, vq, addr->desc_user_addr, &len); 682 if (vq->desc_packed == NULL || 683 len != sizeof(struct vring_packed_desc) * 684 vq->size) { 685 VHOST_LOG_CONFIG(DEBUG, 686 "(%d) failed to map desc_packed ring.\n", 687 dev->vid); 688 return dev; 689 } 690 691 dev = numa_realloc(dev, vq_index); 692 vq = dev->virtqueue[vq_index]; 693 addr = &vq->ring_addrs; 694 695 len = sizeof(struct vring_packed_desc_event); 696 vq->driver_event = (struct vring_packed_desc_event *) 697 (uintptr_t)ring_addr_to_vva(dev, 698 vq, addr->avail_user_addr, &len); 699 if (vq->driver_event == NULL || 700 len != sizeof(struct vring_packed_desc_event)) { 701 VHOST_LOG_CONFIG(DEBUG, 702 "(%d) failed to find driver area address.\n", 703 dev->vid); 704 return dev; 705 } 706 707 len = sizeof(struct vring_packed_desc_event); 708 vq->device_event = (struct vring_packed_desc_event *) 709 (uintptr_t)ring_addr_to_vva(dev, 710 vq, addr->used_user_addr, &len); 711 if (vq->device_event == NULL || 712 len != sizeof(struct vring_packed_desc_event)) { 713 VHOST_LOG_CONFIG(DEBUG, 714 "(%d) failed to find device area address.\n", 715 dev->vid); 716 return dev; 717 } 718 719 vq->access_ok = true; 720 return dev; 721 } 722 723 /* The addresses are converted from QEMU virtual to Vhost virtual. */ 724 if (vq->desc && vq->avail && vq->used) 725 return dev; 726 727 len = sizeof(struct vring_desc) * vq->size; 728 vq->desc = (struct vring_desc *)(uintptr_t)ring_addr_to_vva(dev, 729 vq, addr->desc_user_addr, &len); 730 if (vq->desc == 0 || len != sizeof(struct vring_desc) * vq->size) { 731 VHOST_LOG_CONFIG(DEBUG, 732 "(%d) failed to map desc ring.\n", 733 dev->vid); 734 return dev; 735 } 736 737 dev = numa_realloc(dev, vq_index); 738 vq = dev->virtqueue[vq_index]; 739 addr = &vq->ring_addrs; 740 741 len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size; 742 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) 743 len += sizeof(uint16_t); 744 expected_len = len; 745 vq->avail = (struct vring_avail *)(uintptr_t)ring_addr_to_vva(dev, 746 vq, addr->avail_user_addr, &len); 747 if (vq->avail == 0 || len != expected_len) { 748 VHOST_LOG_CONFIG(DEBUG, 749 "(%d) failed to map avail ring.\n", 750 dev->vid); 751 return dev; 752 } 753 754 len = sizeof(struct vring_used) + 755 sizeof(struct vring_used_elem) * vq->size; 756 if (dev->features & (1ULL << VIRTIO_RING_F_EVENT_IDX)) 757 len += sizeof(uint16_t); 758 expected_len = len; 759 vq->used = (struct vring_used *)(uintptr_t)ring_addr_to_vva(dev, 760 vq, addr->used_user_addr, &len); 761 if (vq->used == 0 || len != expected_len) { 762 VHOST_LOG_CONFIG(DEBUG, 763 "(%d) failed to map used ring.\n", 764 dev->vid); 765 return dev; 766 } 767 768 if (vq->last_used_idx != vq->used->idx) { 769 VHOST_LOG_CONFIG(WARNING, 770 "last_used_idx (%u) and vq->used->idx (%u) mismatches; " 771 "some packets maybe resent for Tx and dropped for Rx\n", 772 vq->last_used_idx, vq->used->idx); 773 vq->last_used_idx = vq->used->idx; 774 vq->last_avail_idx = vq->used->idx; 775 } 776 777 vq->access_ok = true; 778 779 VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address desc: %p\n", 780 dev->vid, vq->desc); 781 VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address avail: %p\n", 782 dev->vid, vq->avail); 783 VHOST_LOG_CONFIG(DEBUG, "(%d) mapped address used: %p\n", 784 dev->vid, vq->used); 785 VHOST_LOG_CONFIG(DEBUG, "(%d) log_guest_addr: %" PRIx64 "\n", 786 dev->vid, vq->log_guest_addr); 787 788 return dev; 789 } 790 791 /* 792 * The virtio device sends us the desc, used and avail ring addresses. 793 * This function then converts these to our address space. 794 */ 795 static int 796 vhost_user_set_vring_addr(struct virtio_net **pdev, struct VhostUserMsg *msg, 797 int main_fd __rte_unused) 798 { 799 struct virtio_net *dev = *pdev; 800 struct vhost_virtqueue *vq; 801 struct vhost_vring_addr *addr = &msg->payload.addr; 802 bool access_ok; 803 804 if (validate_msg_fds(msg, 0) != 0) 805 return RTE_VHOST_MSG_RESULT_ERR; 806 807 if (dev->mem == NULL) 808 return RTE_VHOST_MSG_RESULT_ERR; 809 810 /* addr->index refers to the queue index. The txq 1, rxq is 0. */ 811 vq = dev->virtqueue[msg->payload.addr.index]; 812 813 access_ok = vq->access_ok; 814 815 /* 816 * Rings addresses should not be interpreted as long as the ring is not 817 * started and enabled 818 */ 819 memcpy(&vq->ring_addrs, addr, sizeof(*addr)); 820 821 vring_invalidate(dev, vq); 822 823 if ((vq->enabled && (dev->features & 824 (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) || 825 access_ok) { 826 dev = translate_ring_addresses(dev, msg->payload.addr.index); 827 if (!dev) 828 return RTE_VHOST_MSG_RESULT_ERR; 829 830 *pdev = dev; 831 } 832 833 return RTE_VHOST_MSG_RESULT_OK; 834 } 835 836 /* 837 * The virtio device sends us the available ring last used index. 838 */ 839 static int 840 vhost_user_set_vring_base(struct virtio_net **pdev, 841 struct VhostUserMsg *msg, 842 int main_fd __rte_unused) 843 { 844 struct virtio_net *dev = *pdev; 845 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; 846 uint64_t val = msg->payload.state.num; 847 848 if (validate_msg_fds(msg, 0) != 0) 849 return RTE_VHOST_MSG_RESULT_ERR; 850 851 if (vq_is_packed(dev)) { 852 /* 853 * Bit[0:14]: avail index 854 * Bit[15]: avail wrap counter 855 */ 856 vq->last_avail_idx = val & 0x7fff; 857 vq->avail_wrap_counter = !!(val & (0x1 << 15)); 858 /* 859 * Set used index to same value as available one, as 860 * their values should be the same since ring processing 861 * was stopped at get time. 862 */ 863 vq->last_used_idx = vq->last_avail_idx; 864 vq->used_wrap_counter = vq->avail_wrap_counter; 865 } else { 866 vq->last_used_idx = msg->payload.state.num; 867 vq->last_avail_idx = msg->payload.state.num; 868 } 869 870 return RTE_VHOST_MSG_RESULT_OK; 871 } 872 873 static int 874 add_one_guest_page(struct virtio_net *dev, uint64_t guest_phys_addr, 875 uint64_t host_phys_addr, uint64_t size) 876 { 877 struct guest_page *page, *last_page; 878 struct guest_page *old_pages; 879 880 if (dev->nr_guest_pages == dev->max_guest_pages) { 881 dev->max_guest_pages *= 2; 882 old_pages = dev->guest_pages; 883 dev->guest_pages = rte_realloc(dev->guest_pages, 884 dev->max_guest_pages * sizeof(*page), 885 RTE_CACHE_LINE_SIZE); 886 if (dev->guest_pages == NULL) { 887 VHOST_LOG_CONFIG(ERR, "cannot realloc guest_pages\n"); 888 rte_free(old_pages); 889 return -1; 890 } 891 } 892 893 if (dev->nr_guest_pages > 0) { 894 last_page = &dev->guest_pages[dev->nr_guest_pages - 1]; 895 /* merge if the two pages are continuous */ 896 if (host_phys_addr == last_page->host_phys_addr + 897 last_page->size) { 898 last_page->size += size; 899 return 0; 900 } 901 } 902 903 page = &dev->guest_pages[dev->nr_guest_pages++]; 904 page->guest_phys_addr = guest_phys_addr; 905 page->host_phys_addr = host_phys_addr; 906 page->size = size; 907 908 return 0; 909 } 910 911 static int 912 add_guest_pages(struct virtio_net *dev, struct rte_vhost_mem_region *reg, 913 uint64_t page_size) 914 { 915 uint64_t reg_size = reg->size; 916 uint64_t host_user_addr = reg->host_user_addr; 917 uint64_t guest_phys_addr = reg->guest_phys_addr; 918 uint64_t host_phys_addr; 919 uint64_t size; 920 921 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t)host_user_addr); 922 size = page_size - (guest_phys_addr & (page_size - 1)); 923 size = RTE_MIN(size, reg_size); 924 925 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, size) < 0) 926 return -1; 927 928 host_user_addr += size; 929 guest_phys_addr += size; 930 reg_size -= size; 931 932 while (reg_size > 0) { 933 size = RTE_MIN(reg_size, page_size); 934 host_phys_addr = rte_mem_virt2iova((void *)(uintptr_t) 935 host_user_addr); 936 if (add_one_guest_page(dev, guest_phys_addr, host_phys_addr, 937 size) < 0) 938 return -1; 939 940 host_user_addr += size; 941 guest_phys_addr += size; 942 reg_size -= size; 943 } 944 945 /* sort guest page array if over binary search threshold */ 946 if (dev->nr_guest_pages >= VHOST_BINARY_SEARCH_THRESH) { 947 qsort((void *)dev->guest_pages, dev->nr_guest_pages, 948 sizeof(struct guest_page), guest_page_addrcmp); 949 } 950 951 return 0; 952 } 953 954 #ifdef RTE_LIBRTE_VHOST_DEBUG 955 /* TODO: enable it only in debug mode? */ 956 static void 957 dump_guest_pages(struct virtio_net *dev) 958 { 959 uint32_t i; 960 struct guest_page *page; 961 962 for (i = 0; i < dev->nr_guest_pages; i++) { 963 page = &dev->guest_pages[i]; 964 965 VHOST_LOG_CONFIG(INFO, 966 "guest physical page region %u\n" 967 "\t guest_phys_addr: %" PRIx64 "\n" 968 "\t host_phys_addr : %" PRIx64 "\n" 969 "\t size : %" PRIx64 "\n", 970 i, 971 page->guest_phys_addr, 972 page->host_phys_addr, 973 page->size); 974 } 975 } 976 #else 977 #define dump_guest_pages(dev) 978 #endif 979 980 static bool 981 vhost_memory_changed(struct VhostUserMemory *new, 982 struct rte_vhost_memory *old) 983 { 984 uint32_t i; 985 986 if (new->nregions != old->nregions) 987 return true; 988 989 for (i = 0; i < new->nregions; ++i) { 990 VhostUserMemoryRegion *new_r = &new->regions[i]; 991 struct rte_vhost_mem_region *old_r = &old->regions[i]; 992 993 if (new_r->guest_phys_addr != old_r->guest_phys_addr) 994 return true; 995 if (new_r->memory_size != old_r->size) 996 return true; 997 if (new_r->userspace_addr != old_r->guest_user_addr) 998 return true; 999 } 1000 1001 return false; 1002 } 1003 1004 #ifdef RTE_LIBRTE_VHOST_POSTCOPY 1005 static int 1006 vhost_user_postcopy_region_register(struct virtio_net *dev, 1007 struct rte_vhost_mem_region *reg) 1008 { 1009 struct uffdio_register reg_struct; 1010 1011 /* 1012 * Let's register all the mmap'ed area to ensure 1013 * alignment on page boundary. 1014 */ 1015 reg_struct.range.start = (uint64_t)(uintptr_t)reg->mmap_addr; 1016 reg_struct.range.len = reg->mmap_size; 1017 reg_struct.mode = UFFDIO_REGISTER_MODE_MISSING; 1018 1019 if (ioctl(dev->postcopy_ufd, UFFDIO_REGISTER, 1020 ®_struct)) { 1021 VHOST_LOG_CONFIG(ERR, "Failed to register ufd for region " 1022 "%" PRIx64 " - %" PRIx64 " (ufd = %d) %s\n", 1023 (uint64_t)reg_struct.range.start, 1024 (uint64_t)reg_struct.range.start + 1025 (uint64_t)reg_struct.range.len - 1, 1026 dev->postcopy_ufd, 1027 strerror(errno)); 1028 return -1; 1029 } 1030 1031 VHOST_LOG_CONFIG(INFO, "\t userfaultfd registered for range : %" PRIx64 " - %" PRIx64 "\n", 1032 (uint64_t)reg_struct.range.start, 1033 (uint64_t)reg_struct.range.start + 1034 (uint64_t)reg_struct.range.len - 1); 1035 1036 return 0; 1037 } 1038 #else 1039 static int 1040 vhost_user_postcopy_region_register(struct virtio_net *dev __rte_unused, 1041 struct rte_vhost_mem_region *reg __rte_unused) 1042 { 1043 return -1; 1044 } 1045 #endif 1046 1047 static int 1048 vhost_user_postcopy_register(struct virtio_net *dev, int main_fd, 1049 struct VhostUserMsg *msg) 1050 { 1051 struct VhostUserMemory *memory; 1052 struct rte_vhost_mem_region *reg; 1053 VhostUserMsg ack_msg; 1054 uint32_t i; 1055 1056 if (!dev->postcopy_listening) 1057 return 0; 1058 1059 /* 1060 * We haven't a better way right now than sharing 1061 * DPDK's virtual address with Qemu, so that Qemu can 1062 * retrieve the region offset when handling userfaults. 1063 */ 1064 memory = &msg->payload.memory; 1065 for (i = 0; i < memory->nregions; i++) { 1066 reg = &dev->mem->regions[i]; 1067 memory->regions[i].userspace_addr = reg->host_user_addr; 1068 } 1069 1070 /* Send the addresses back to qemu */ 1071 msg->fd_num = 0; 1072 send_vhost_reply(main_fd, msg); 1073 1074 /* Wait for qemu to acknolwedge it's got the addresses 1075 * we've got to wait before we're allowed to generate faults. 1076 */ 1077 if (read_vhost_message(main_fd, &ack_msg) <= 0) { 1078 VHOST_LOG_CONFIG(ERR, 1079 "Failed to read qemu ack on postcopy set-mem-table\n"); 1080 return -1; 1081 } 1082 1083 if (validate_msg_fds(&ack_msg, 0) != 0) 1084 return -1; 1085 1086 if (ack_msg.request.master != VHOST_USER_SET_MEM_TABLE) { 1087 VHOST_LOG_CONFIG(ERR, 1088 "Bad qemu ack on postcopy set-mem-table (%d)\n", 1089 ack_msg.request.master); 1090 return -1; 1091 } 1092 1093 /* Now userfault register and we can use the memory */ 1094 for (i = 0; i < memory->nregions; i++) { 1095 reg = &dev->mem->regions[i]; 1096 if (vhost_user_postcopy_region_register(dev, reg) < 0) 1097 return -1; 1098 } 1099 1100 return 0; 1101 } 1102 1103 static int 1104 vhost_user_mmap_region(struct virtio_net *dev, 1105 struct rte_vhost_mem_region *region, 1106 uint64_t mmap_offset) 1107 { 1108 void *mmap_addr; 1109 uint64_t mmap_size; 1110 uint64_t alignment; 1111 int populate; 1112 1113 /* Check for memory_size + mmap_offset overflow */ 1114 if (mmap_offset >= -region->size) { 1115 VHOST_LOG_CONFIG(ERR, 1116 "mmap_offset (%#"PRIx64") and memory_size " 1117 "(%#"PRIx64") overflow\n", 1118 mmap_offset, region->size); 1119 return -1; 1120 } 1121 1122 mmap_size = region->size + mmap_offset; 1123 1124 /* mmap() without flag of MAP_ANONYMOUS, should be called with length 1125 * argument aligned with hugepagesz at older longterm version Linux, 1126 * like 2.6.32 and 3.2.72, or mmap() will fail with EINVAL. 1127 * 1128 * To avoid failure, make sure in caller to keep length aligned. 1129 */ 1130 alignment = get_blk_size(region->fd); 1131 if (alignment == (uint64_t)-1) { 1132 VHOST_LOG_CONFIG(ERR, 1133 "couldn't get hugepage size through fstat\n"); 1134 return -1; 1135 } 1136 mmap_size = RTE_ALIGN_CEIL(mmap_size, alignment); 1137 if (mmap_size == 0) { 1138 /* 1139 * It could happen if initial mmap_size + alignment overflows 1140 * the sizeof uint64, which could happen if either mmap_size or 1141 * alignment value is wrong. 1142 * 1143 * mmap() kernel implementation would return an error, but 1144 * better catch it before and provide useful info in the logs. 1145 */ 1146 VHOST_LOG_CONFIG(ERR, "mmap size (0x%" PRIx64 ") " 1147 "or alignment (0x%" PRIx64 ") is invalid\n", 1148 region->size + mmap_offset, alignment); 1149 return -1; 1150 } 1151 1152 populate = dev->async_copy ? MAP_POPULATE : 0; 1153 mmap_addr = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, 1154 MAP_SHARED | populate, region->fd, 0); 1155 1156 if (mmap_addr == MAP_FAILED) { 1157 VHOST_LOG_CONFIG(ERR, "mmap failed (%s).\n", strerror(errno)); 1158 return -1; 1159 } 1160 1161 region->mmap_addr = mmap_addr; 1162 region->mmap_size = mmap_size; 1163 region->host_user_addr = (uint64_t)(uintptr_t)mmap_addr + mmap_offset; 1164 1165 if (dev->async_copy) 1166 if (add_guest_pages(dev, region, alignment) < 0) { 1167 VHOST_LOG_CONFIG(ERR, 1168 "adding guest pages to region failed.\n"); 1169 return -1; 1170 } 1171 1172 VHOST_LOG_CONFIG(INFO, 1173 "guest memory region size: 0x%" PRIx64 "\n" 1174 "\t guest physical addr: 0x%" PRIx64 "\n" 1175 "\t guest virtual addr: 0x%" PRIx64 "\n" 1176 "\t host virtual addr: 0x%" PRIx64 "\n" 1177 "\t mmap addr : 0x%" PRIx64 "\n" 1178 "\t mmap size : 0x%" PRIx64 "\n" 1179 "\t mmap align: 0x%" PRIx64 "\n" 1180 "\t mmap off : 0x%" PRIx64 "\n", 1181 region->size, 1182 region->guest_phys_addr, 1183 region->guest_user_addr, 1184 region->host_user_addr, 1185 (uint64_t)(uintptr_t)mmap_addr, 1186 mmap_size, 1187 alignment, 1188 mmap_offset); 1189 1190 return 0; 1191 } 1192 1193 static int 1194 vhost_user_set_mem_table(struct virtio_net **pdev, struct VhostUserMsg *msg, 1195 int main_fd) 1196 { 1197 struct virtio_net *dev = *pdev; 1198 struct VhostUserMemory *memory = &msg->payload.memory; 1199 struct rte_vhost_mem_region *reg; 1200 1201 uint64_t mmap_offset; 1202 uint32_t i; 1203 1204 if (validate_msg_fds(msg, memory->nregions) != 0) 1205 return RTE_VHOST_MSG_RESULT_ERR; 1206 1207 if (memory->nregions > VHOST_MEMORY_MAX_NREGIONS) { 1208 VHOST_LOG_CONFIG(ERR, 1209 "too many memory regions (%u)\n", memory->nregions); 1210 goto close_msg_fds; 1211 } 1212 1213 if (dev->mem && !vhost_memory_changed(memory, dev->mem)) { 1214 VHOST_LOG_CONFIG(INFO, 1215 "(%d) memory regions not changed\n", dev->vid); 1216 1217 close_msg_fds(msg); 1218 1219 return RTE_VHOST_MSG_RESULT_OK; 1220 } 1221 1222 if (dev->mem) { 1223 if (dev->flags & VIRTIO_DEV_VDPA_CONFIGURED) { 1224 struct rte_vdpa_device *vdpa_dev = dev->vdpa_dev; 1225 1226 if (vdpa_dev && vdpa_dev->ops->dev_close) 1227 vdpa_dev->ops->dev_close(dev->vid); 1228 dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED; 1229 } 1230 free_mem_region(dev); 1231 rte_free(dev->mem); 1232 dev->mem = NULL; 1233 } 1234 1235 /* Flush IOTLB cache as previous HVAs are now invalid */ 1236 if (dev->features & (1ULL << VIRTIO_F_IOMMU_PLATFORM)) 1237 for (i = 0; i < dev->nr_vring; i++) 1238 vhost_user_iotlb_flush_all(dev->virtqueue[i]); 1239 1240 dev->nr_guest_pages = 0; 1241 if (dev->guest_pages == NULL) { 1242 dev->max_guest_pages = 8; 1243 dev->guest_pages = rte_zmalloc(NULL, 1244 dev->max_guest_pages * 1245 sizeof(struct guest_page), 1246 RTE_CACHE_LINE_SIZE); 1247 if (dev->guest_pages == NULL) { 1248 VHOST_LOG_CONFIG(ERR, 1249 "(%d) failed to allocate memory " 1250 "for dev->guest_pages\n", 1251 dev->vid); 1252 goto close_msg_fds; 1253 } 1254 } 1255 1256 dev->mem = rte_zmalloc("vhost-mem-table", sizeof(struct rte_vhost_memory) + 1257 sizeof(struct rte_vhost_mem_region) * memory->nregions, 0); 1258 if (dev->mem == NULL) { 1259 VHOST_LOG_CONFIG(ERR, 1260 "(%d) failed to allocate memory for dev->mem\n", 1261 dev->vid); 1262 goto free_guest_pages; 1263 } 1264 1265 for (i = 0; i < memory->nregions; i++) { 1266 reg = &dev->mem->regions[i]; 1267 1268 reg->guest_phys_addr = memory->regions[i].guest_phys_addr; 1269 reg->guest_user_addr = memory->regions[i].userspace_addr; 1270 reg->size = memory->regions[i].memory_size; 1271 reg->fd = msg->fds[i]; 1272 1273 /* 1274 * Assign invalid file descriptor value to avoid double 1275 * closing on error path. 1276 */ 1277 msg->fds[i] = -1; 1278 1279 mmap_offset = memory->regions[i].mmap_offset; 1280 1281 if (vhost_user_mmap_region(dev, reg, mmap_offset) < 0) { 1282 VHOST_LOG_CONFIG(ERR, "Failed to mmap region %u\n", i); 1283 goto free_mem_table; 1284 } 1285 1286 dev->mem->nregions++; 1287 } 1288 1289 if (vhost_user_postcopy_register(dev, main_fd, msg) < 0) 1290 goto free_mem_table; 1291 1292 for (i = 0; i < dev->nr_vring; i++) { 1293 struct vhost_virtqueue *vq = dev->virtqueue[i]; 1294 1295 if (!vq) 1296 continue; 1297 1298 if (vq->desc || vq->avail || vq->used) { 1299 /* 1300 * If the memory table got updated, the ring addresses 1301 * need to be translated again as virtual addresses have 1302 * changed. 1303 */ 1304 vring_invalidate(dev, vq); 1305 1306 dev = translate_ring_addresses(dev, i); 1307 if (!dev) { 1308 dev = *pdev; 1309 goto free_mem_table; 1310 } 1311 1312 *pdev = dev; 1313 } 1314 } 1315 1316 dump_guest_pages(dev); 1317 1318 return RTE_VHOST_MSG_RESULT_OK; 1319 1320 free_mem_table: 1321 free_mem_region(dev); 1322 rte_free(dev->mem); 1323 dev->mem = NULL; 1324 free_guest_pages: 1325 rte_free(dev->guest_pages); 1326 dev->guest_pages = NULL; 1327 close_msg_fds: 1328 close_msg_fds(msg); 1329 return RTE_VHOST_MSG_RESULT_ERR; 1330 } 1331 1332 static bool 1333 vq_is_ready(struct virtio_net *dev, struct vhost_virtqueue *vq) 1334 { 1335 bool rings_ok; 1336 1337 if (!vq) 1338 return false; 1339 1340 if (vq_is_packed(dev)) 1341 rings_ok = vq->desc_packed && vq->driver_event && 1342 vq->device_event; 1343 else 1344 rings_ok = vq->desc && vq->avail && vq->used; 1345 1346 return rings_ok && 1347 vq->kickfd != VIRTIO_UNINITIALIZED_EVENTFD && 1348 vq->callfd != VIRTIO_UNINITIALIZED_EVENTFD && 1349 vq->enabled; 1350 } 1351 1352 #define VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY 2u 1353 1354 static int 1355 virtio_is_ready(struct virtio_net *dev) 1356 { 1357 struct vhost_virtqueue *vq; 1358 uint32_t i, nr_vring = dev->nr_vring; 1359 1360 if (dev->flags & VIRTIO_DEV_READY) 1361 return 1; 1362 1363 if (!dev->nr_vring) 1364 return 0; 1365 1366 if (dev->flags & VIRTIO_DEV_BUILTIN_VIRTIO_NET) { 1367 nr_vring = VIRTIO_BUILTIN_NUM_VQS_TO_BE_READY; 1368 1369 if (dev->nr_vring < nr_vring) 1370 return 0; 1371 } 1372 1373 for (i = 0; i < nr_vring; i++) { 1374 vq = dev->virtqueue[i]; 1375 1376 if (!vq_is_ready(dev, vq)) 1377 return 0; 1378 } 1379 1380 /* If supported, ensure the frontend is really done with config */ 1381 if (dev->protocol_features & (1ULL << VHOST_USER_PROTOCOL_F_STATUS)) 1382 if (!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK)) 1383 return 0; 1384 1385 dev->flags |= VIRTIO_DEV_READY; 1386 1387 if (!(dev->flags & VIRTIO_DEV_RUNNING)) 1388 VHOST_LOG_CONFIG(INFO, 1389 "virtio is now ready for processing.\n"); 1390 return 1; 1391 } 1392 1393 static void * 1394 inflight_mem_alloc(const char *name, size_t size, int *fd) 1395 { 1396 void *ptr; 1397 int mfd = -1; 1398 char fname[20] = "/tmp/memfd-XXXXXX"; 1399 1400 *fd = -1; 1401 #ifdef MEMFD_SUPPORTED 1402 mfd = memfd_create(name, MFD_CLOEXEC); 1403 #else 1404 RTE_SET_USED(name); 1405 #endif 1406 if (mfd == -1) { 1407 mfd = mkstemp(fname); 1408 if (mfd == -1) { 1409 VHOST_LOG_CONFIG(ERR, 1410 "failed to get inflight buffer fd\n"); 1411 return NULL; 1412 } 1413 1414 unlink(fname); 1415 } 1416 1417 if (ftruncate(mfd, size) == -1) { 1418 VHOST_LOG_CONFIG(ERR, 1419 "failed to alloc inflight buffer\n"); 1420 close(mfd); 1421 return NULL; 1422 } 1423 1424 ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, mfd, 0); 1425 if (ptr == MAP_FAILED) { 1426 VHOST_LOG_CONFIG(ERR, 1427 "failed to mmap inflight buffer\n"); 1428 close(mfd); 1429 return NULL; 1430 } 1431 1432 *fd = mfd; 1433 return ptr; 1434 } 1435 1436 static uint32_t 1437 get_pervq_shm_size_split(uint16_t queue_size) 1438 { 1439 return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_split) * 1440 queue_size + sizeof(uint64_t) + 1441 sizeof(uint16_t) * 4, INFLIGHT_ALIGNMENT); 1442 } 1443 1444 static uint32_t 1445 get_pervq_shm_size_packed(uint16_t queue_size) 1446 { 1447 return RTE_ALIGN_MUL_CEIL(sizeof(struct rte_vhost_inflight_desc_packed) 1448 * queue_size + sizeof(uint64_t) + 1449 sizeof(uint16_t) * 6 + sizeof(uint8_t) * 9, 1450 INFLIGHT_ALIGNMENT); 1451 } 1452 1453 static int 1454 vhost_user_get_inflight_fd(struct virtio_net **pdev, 1455 VhostUserMsg *msg, 1456 int main_fd __rte_unused) 1457 { 1458 struct rte_vhost_inflight_info_packed *inflight_packed; 1459 uint64_t pervq_inflight_size, mmap_size; 1460 uint16_t num_queues, queue_size; 1461 struct virtio_net *dev = *pdev; 1462 int fd, i, j; 1463 void *addr; 1464 1465 if (msg->size != sizeof(msg->payload.inflight)) { 1466 VHOST_LOG_CONFIG(ERR, 1467 "invalid get_inflight_fd message size is %d\n", 1468 msg->size); 1469 return RTE_VHOST_MSG_RESULT_ERR; 1470 } 1471 1472 if (dev->inflight_info == NULL) { 1473 dev->inflight_info = calloc(1, 1474 sizeof(struct inflight_mem_info)); 1475 if (!dev->inflight_info) { 1476 VHOST_LOG_CONFIG(ERR, 1477 "failed to alloc dev inflight area\n"); 1478 return RTE_VHOST_MSG_RESULT_ERR; 1479 } 1480 dev->inflight_info->fd = -1; 1481 } 1482 1483 num_queues = msg->payload.inflight.num_queues; 1484 queue_size = msg->payload.inflight.queue_size; 1485 1486 VHOST_LOG_CONFIG(INFO, "get_inflight_fd num_queues: %u\n", 1487 msg->payload.inflight.num_queues); 1488 VHOST_LOG_CONFIG(INFO, "get_inflight_fd queue_size: %u\n", 1489 msg->payload.inflight.queue_size); 1490 1491 if (vq_is_packed(dev)) 1492 pervq_inflight_size = get_pervq_shm_size_packed(queue_size); 1493 else 1494 pervq_inflight_size = get_pervq_shm_size_split(queue_size); 1495 1496 mmap_size = num_queues * pervq_inflight_size; 1497 addr = inflight_mem_alloc("vhost-inflight", mmap_size, &fd); 1498 if (!addr) { 1499 VHOST_LOG_CONFIG(ERR, 1500 "failed to alloc vhost inflight area\n"); 1501 msg->payload.inflight.mmap_size = 0; 1502 return RTE_VHOST_MSG_RESULT_ERR; 1503 } 1504 memset(addr, 0, mmap_size); 1505 1506 if (dev->inflight_info->addr) { 1507 munmap(dev->inflight_info->addr, dev->inflight_info->size); 1508 dev->inflight_info->addr = NULL; 1509 } 1510 1511 if (dev->inflight_info->fd >= 0) { 1512 close(dev->inflight_info->fd); 1513 dev->inflight_info->fd = -1; 1514 } 1515 1516 dev->inflight_info->addr = addr; 1517 dev->inflight_info->size = msg->payload.inflight.mmap_size = mmap_size; 1518 dev->inflight_info->fd = msg->fds[0] = fd; 1519 msg->payload.inflight.mmap_offset = 0; 1520 msg->fd_num = 1; 1521 1522 if (vq_is_packed(dev)) { 1523 for (i = 0; i < num_queues; i++) { 1524 inflight_packed = 1525 (struct rte_vhost_inflight_info_packed *)addr; 1526 inflight_packed->used_wrap_counter = 1; 1527 inflight_packed->old_used_wrap_counter = 1; 1528 for (j = 0; j < queue_size; j++) 1529 inflight_packed->desc[j].next = j + 1; 1530 addr = (void *)((char *)addr + pervq_inflight_size); 1531 } 1532 } 1533 1534 VHOST_LOG_CONFIG(INFO, 1535 "send inflight mmap_size: %"PRIu64"\n", 1536 msg->payload.inflight.mmap_size); 1537 VHOST_LOG_CONFIG(INFO, 1538 "send inflight mmap_offset: %"PRIu64"\n", 1539 msg->payload.inflight.mmap_offset); 1540 VHOST_LOG_CONFIG(INFO, 1541 "send inflight fd: %d\n", msg->fds[0]); 1542 1543 return RTE_VHOST_MSG_RESULT_REPLY; 1544 } 1545 1546 static int 1547 vhost_user_set_inflight_fd(struct virtio_net **pdev, VhostUserMsg *msg, 1548 int main_fd __rte_unused) 1549 { 1550 uint64_t mmap_size, mmap_offset; 1551 uint16_t num_queues, queue_size; 1552 struct virtio_net *dev = *pdev; 1553 uint32_t pervq_inflight_size; 1554 struct vhost_virtqueue *vq; 1555 void *addr; 1556 int fd, i; 1557 1558 fd = msg->fds[0]; 1559 if (msg->size != sizeof(msg->payload.inflight) || fd < 0) { 1560 VHOST_LOG_CONFIG(ERR, 1561 "invalid set_inflight_fd message size is %d,fd is %d\n", 1562 msg->size, fd); 1563 return RTE_VHOST_MSG_RESULT_ERR; 1564 } 1565 1566 mmap_size = msg->payload.inflight.mmap_size; 1567 mmap_offset = msg->payload.inflight.mmap_offset; 1568 num_queues = msg->payload.inflight.num_queues; 1569 queue_size = msg->payload.inflight.queue_size; 1570 1571 if (vq_is_packed(dev)) 1572 pervq_inflight_size = get_pervq_shm_size_packed(queue_size); 1573 else 1574 pervq_inflight_size = get_pervq_shm_size_split(queue_size); 1575 1576 VHOST_LOG_CONFIG(INFO, 1577 "set_inflight_fd mmap_size: %"PRIu64"\n", mmap_size); 1578 VHOST_LOG_CONFIG(INFO, 1579 "set_inflight_fd mmap_offset: %"PRIu64"\n", mmap_offset); 1580 VHOST_LOG_CONFIG(INFO, 1581 "set_inflight_fd num_queues: %u\n", num_queues); 1582 VHOST_LOG_CONFIG(INFO, 1583 "set_inflight_fd queue_size: %u\n", queue_size); 1584 VHOST_LOG_CONFIG(INFO, 1585 "set_inflight_fd fd: %d\n", fd); 1586 VHOST_LOG_CONFIG(INFO, 1587 "set_inflight_fd pervq_inflight_size: %d\n", 1588 pervq_inflight_size); 1589 1590 if (!dev->inflight_info) { 1591 dev->inflight_info = calloc(1, 1592 sizeof(struct inflight_mem_info)); 1593 if (dev->inflight_info == NULL) { 1594 VHOST_LOG_CONFIG(ERR, 1595 "failed to alloc dev inflight area\n"); 1596 return RTE_VHOST_MSG_RESULT_ERR; 1597 } 1598 dev->inflight_info->fd = -1; 1599 } 1600 1601 if (dev->inflight_info->addr) { 1602 munmap(dev->inflight_info->addr, dev->inflight_info->size); 1603 dev->inflight_info->addr = NULL; 1604 } 1605 1606 addr = mmap(0, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED, 1607 fd, mmap_offset); 1608 if (addr == MAP_FAILED) { 1609 VHOST_LOG_CONFIG(ERR, "failed to mmap share memory.\n"); 1610 return RTE_VHOST_MSG_RESULT_ERR; 1611 } 1612 1613 if (dev->inflight_info->fd >= 0) { 1614 close(dev->inflight_info->fd); 1615 dev->inflight_info->fd = -1; 1616 } 1617 1618 dev->inflight_info->fd = fd; 1619 dev->inflight_info->addr = addr; 1620 dev->inflight_info->size = mmap_size; 1621 1622 for (i = 0; i < num_queues; i++) { 1623 vq = dev->virtqueue[i]; 1624 if (!vq) 1625 continue; 1626 1627 if (vq_is_packed(dev)) { 1628 vq->inflight_packed = addr; 1629 vq->inflight_packed->desc_num = queue_size; 1630 } else { 1631 vq->inflight_split = addr; 1632 vq->inflight_split->desc_num = queue_size; 1633 } 1634 addr = (void *)((char *)addr + pervq_inflight_size); 1635 } 1636 1637 return RTE_VHOST_MSG_RESULT_OK; 1638 } 1639 1640 static int 1641 vhost_user_set_vring_call(struct virtio_net **pdev, struct VhostUserMsg *msg, 1642 int main_fd __rte_unused) 1643 { 1644 struct virtio_net *dev = *pdev; 1645 struct vhost_vring_file file; 1646 struct vhost_virtqueue *vq; 1647 int expected_fds; 1648 1649 expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1; 1650 if (validate_msg_fds(msg, expected_fds) != 0) 1651 return RTE_VHOST_MSG_RESULT_ERR; 1652 1653 file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; 1654 if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) 1655 file.fd = VIRTIO_INVALID_EVENTFD; 1656 else 1657 file.fd = msg->fds[0]; 1658 VHOST_LOG_CONFIG(INFO, 1659 "vring call idx:%d file:%d\n", file.index, file.fd); 1660 1661 vq = dev->virtqueue[file.index]; 1662 1663 if (vq->ready) { 1664 vq->ready = false; 1665 vhost_user_notify_queue_state(dev, file.index, 0); 1666 } 1667 1668 if (vq->callfd >= 0) 1669 close(vq->callfd); 1670 1671 vq->callfd = file.fd; 1672 1673 return RTE_VHOST_MSG_RESULT_OK; 1674 } 1675 1676 static int vhost_user_set_vring_err(struct virtio_net **pdev __rte_unused, 1677 struct VhostUserMsg *msg, 1678 int main_fd __rte_unused) 1679 { 1680 int expected_fds; 1681 1682 expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1; 1683 if (validate_msg_fds(msg, expected_fds) != 0) 1684 return RTE_VHOST_MSG_RESULT_ERR; 1685 1686 if (!(msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK)) 1687 close(msg->fds[0]); 1688 VHOST_LOG_CONFIG(INFO, "not implemented\n"); 1689 1690 return RTE_VHOST_MSG_RESULT_OK; 1691 } 1692 1693 static int 1694 resubmit_desc_compare(const void *a, const void *b) 1695 { 1696 const struct rte_vhost_resubmit_desc *desc0 = a; 1697 const struct rte_vhost_resubmit_desc *desc1 = b; 1698 1699 if (desc1->counter > desc0->counter) 1700 return 1; 1701 1702 return -1; 1703 } 1704 1705 static int 1706 vhost_check_queue_inflights_split(struct virtio_net *dev, 1707 struct vhost_virtqueue *vq) 1708 { 1709 uint16_t i; 1710 uint16_t resubmit_num = 0, last_io, num; 1711 struct vring_used *used = vq->used; 1712 struct rte_vhost_resubmit_info *resubmit; 1713 struct rte_vhost_inflight_info_split *inflight_split; 1714 1715 if (!(dev->protocol_features & 1716 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))) 1717 return RTE_VHOST_MSG_RESULT_OK; 1718 1719 /* The frontend may still not support the inflight feature 1720 * although we negotiate the protocol feature. 1721 */ 1722 if ((!vq->inflight_split)) 1723 return RTE_VHOST_MSG_RESULT_OK; 1724 1725 if (!vq->inflight_split->version) { 1726 vq->inflight_split->version = INFLIGHT_VERSION; 1727 return RTE_VHOST_MSG_RESULT_OK; 1728 } 1729 1730 if (vq->resubmit_inflight) 1731 return RTE_VHOST_MSG_RESULT_OK; 1732 1733 inflight_split = vq->inflight_split; 1734 vq->global_counter = 0; 1735 last_io = inflight_split->last_inflight_io; 1736 1737 if (inflight_split->used_idx != used->idx) { 1738 inflight_split->desc[last_io].inflight = 0; 1739 rte_atomic_thread_fence(__ATOMIC_SEQ_CST); 1740 inflight_split->used_idx = used->idx; 1741 } 1742 1743 for (i = 0; i < inflight_split->desc_num; i++) { 1744 if (inflight_split->desc[i].inflight == 1) 1745 resubmit_num++; 1746 } 1747 1748 vq->last_avail_idx += resubmit_num; 1749 1750 if (resubmit_num) { 1751 resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info)); 1752 if (!resubmit) { 1753 VHOST_LOG_CONFIG(ERR, 1754 "failed to allocate memory for resubmit info.\n"); 1755 return RTE_VHOST_MSG_RESULT_ERR; 1756 } 1757 1758 resubmit->resubmit_list = calloc(resubmit_num, 1759 sizeof(struct rte_vhost_resubmit_desc)); 1760 if (!resubmit->resubmit_list) { 1761 VHOST_LOG_CONFIG(ERR, 1762 "failed to allocate memory for inflight desc.\n"); 1763 free(resubmit); 1764 return RTE_VHOST_MSG_RESULT_ERR; 1765 } 1766 1767 num = 0; 1768 for (i = 0; i < vq->inflight_split->desc_num; i++) { 1769 if (vq->inflight_split->desc[i].inflight == 1) { 1770 resubmit->resubmit_list[num].index = i; 1771 resubmit->resubmit_list[num].counter = 1772 inflight_split->desc[i].counter; 1773 num++; 1774 } 1775 } 1776 resubmit->resubmit_num = num; 1777 1778 if (resubmit->resubmit_num > 1) 1779 qsort(resubmit->resubmit_list, resubmit->resubmit_num, 1780 sizeof(struct rte_vhost_resubmit_desc), 1781 resubmit_desc_compare); 1782 1783 vq->global_counter = resubmit->resubmit_list[0].counter + 1; 1784 vq->resubmit_inflight = resubmit; 1785 } 1786 1787 return RTE_VHOST_MSG_RESULT_OK; 1788 } 1789 1790 static int 1791 vhost_check_queue_inflights_packed(struct virtio_net *dev, 1792 struct vhost_virtqueue *vq) 1793 { 1794 uint16_t i; 1795 uint16_t resubmit_num = 0, old_used_idx, num; 1796 struct rte_vhost_resubmit_info *resubmit; 1797 struct rte_vhost_inflight_info_packed *inflight_packed; 1798 1799 if (!(dev->protocol_features & 1800 (1ULL << VHOST_USER_PROTOCOL_F_INFLIGHT_SHMFD))) 1801 return RTE_VHOST_MSG_RESULT_OK; 1802 1803 /* The frontend may still not support the inflight feature 1804 * although we negotiate the protocol feature. 1805 */ 1806 if ((!vq->inflight_packed)) 1807 return RTE_VHOST_MSG_RESULT_OK; 1808 1809 if (!vq->inflight_packed->version) { 1810 vq->inflight_packed->version = INFLIGHT_VERSION; 1811 return RTE_VHOST_MSG_RESULT_OK; 1812 } 1813 1814 if (vq->resubmit_inflight) 1815 return RTE_VHOST_MSG_RESULT_OK; 1816 1817 inflight_packed = vq->inflight_packed; 1818 vq->global_counter = 0; 1819 old_used_idx = inflight_packed->old_used_idx; 1820 1821 if (inflight_packed->used_idx != old_used_idx) { 1822 if (inflight_packed->desc[old_used_idx].inflight == 0) { 1823 inflight_packed->old_used_idx = 1824 inflight_packed->used_idx; 1825 inflight_packed->old_used_wrap_counter = 1826 inflight_packed->used_wrap_counter; 1827 inflight_packed->old_free_head = 1828 inflight_packed->free_head; 1829 } else { 1830 inflight_packed->used_idx = 1831 inflight_packed->old_used_idx; 1832 inflight_packed->used_wrap_counter = 1833 inflight_packed->old_used_wrap_counter; 1834 inflight_packed->free_head = 1835 inflight_packed->old_free_head; 1836 } 1837 } 1838 1839 for (i = 0; i < inflight_packed->desc_num; i++) { 1840 if (inflight_packed->desc[i].inflight == 1) 1841 resubmit_num++; 1842 } 1843 1844 if (resubmit_num) { 1845 resubmit = calloc(1, sizeof(struct rte_vhost_resubmit_info)); 1846 if (resubmit == NULL) { 1847 VHOST_LOG_CONFIG(ERR, 1848 "failed to allocate memory for resubmit info.\n"); 1849 return RTE_VHOST_MSG_RESULT_ERR; 1850 } 1851 1852 resubmit->resubmit_list = calloc(resubmit_num, 1853 sizeof(struct rte_vhost_resubmit_desc)); 1854 if (resubmit->resubmit_list == NULL) { 1855 VHOST_LOG_CONFIG(ERR, 1856 "failed to allocate memory for resubmit desc.\n"); 1857 free(resubmit); 1858 return RTE_VHOST_MSG_RESULT_ERR; 1859 } 1860 1861 num = 0; 1862 for (i = 0; i < inflight_packed->desc_num; i++) { 1863 if (vq->inflight_packed->desc[i].inflight == 1) { 1864 resubmit->resubmit_list[num].index = i; 1865 resubmit->resubmit_list[num].counter = 1866 inflight_packed->desc[i].counter; 1867 num++; 1868 } 1869 } 1870 resubmit->resubmit_num = num; 1871 1872 if (resubmit->resubmit_num > 1) 1873 qsort(resubmit->resubmit_list, resubmit->resubmit_num, 1874 sizeof(struct rte_vhost_resubmit_desc), 1875 resubmit_desc_compare); 1876 1877 vq->global_counter = resubmit->resubmit_list[0].counter + 1; 1878 vq->resubmit_inflight = resubmit; 1879 } 1880 1881 return RTE_VHOST_MSG_RESULT_OK; 1882 } 1883 1884 static int 1885 vhost_user_set_vring_kick(struct virtio_net **pdev, struct VhostUserMsg *msg, 1886 int main_fd __rte_unused) 1887 { 1888 struct virtio_net *dev = *pdev; 1889 struct vhost_vring_file file; 1890 struct vhost_virtqueue *vq; 1891 int expected_fds; 1892 1893 expected_fds = (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) ? 0 : 1; 1894 if (validate_msg_fds(msg, expected_fds) != 0) 1895 return RTE_VHOST_MSG_RESULT_ERR; 1896 1897 file.index = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; 1898 if (msg->payload.u64 & VHOST_USER_VRING_NOFD_MASK) 1899 file.fd = VIRTIO_INVALID_EVENTFD; 1900 else 1901 file.fd = msg->fds[0]; 1902 VHOST_LOG_CONFIG(INFO, 1903 "vring kick idx:%d file:%d\n", file.index, file.fd); 1904 1905 /* Interpret ring addresses only when ring is started. */ 1906 dev = translate_ring_addresses(dev, file.index); 1907 if (!dev) { 1908 if (file.fd != VIRTIO_INVALID_EVENTFD) 1909 close(file.fd); 1910 1911 return RTE_VHOST_MSG_RESULT_ERR; 1912 } 1913 1914 *pdev = dev; 1915 1916 vq = dev->virtqueue[file.index]; 1917 1918 /* 1919 * When VHOST_USER_F_PROTOCOL_FEATURES is not negotiated, 1920 * the ring starts already enabled. Otherwise, it is enabled via 1921 * the SET_VRING_ENABLE message. 1922 */ 1923 if (!(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES))) { 1924 vq->enabled = true; 1925 } 1926 1927 if (vq->ready) { 1928 vq->ready = false; 1929 vhost_user_notify_queue_state(dev, file.index, 0); 1930 } 1931 1932 if (vq->kickfd >= 0) 1933 close(vq->kickfd); 1934 vq->kickfd = file.fd; 1935 1936 if (vq_is_packed(dev)) { 1937 if (vhost_check_queue_inflights_packed(dev, vq)) { 1938 VHOST_LOG_CONFIG(ERR, 1939 "failed to inflights for vq: %d\n", file.index); 1940 return RTE_VHOST_MSG_RESULT_ERR; 1941 } 1942 } else { 1943 if (vhost_check_queue_inflights_split(dev, vq)) { 1944 VHOST_LOG_CONFIG(ERR, 1945 "failed to inflights for vq: %d\n", file.index); 1946 return RTE_VHOST_MSG_RESULT_ERR; 1947 } 1948 } 1949 1950 return RTE_VHOST_MSG_RESULT_OK; 1951 } 1952 1953 /* 1954 * when virtio is stopped, qemu will send us the GET_VRING_BASE message. 1955 */ 1956 static int 1957 vhost_user_get_vring_base(struct virtio_net **pdev, 1958 struct VhostUserMsg *msg, 1959 int main_fd __rte_unused) 1960 { 1961 struct virtio_net *dev = *pdev; 1962 struct vhost_virtqueue *vq = dev->virtqueue[msg->payload.state.index]; 1963 uint64_t val; 1964 1965 if (validate_msg_fds(msg, 0) != 0) 1966 return RTE_VHOST_MSG_RESULT_ERR; 1967 1968 /* We have to stop the queue (virtio) if it is running. */ 1969 vhost_destroy_device_notify(dev); 1970 1971 dev->flags &= ~VIRTIO_DEV_READY; 1972 dev->flags &= ~VIRTIO_DEV_VDPA_CONFIGURED; 1973 1974 /* Here we are safe to get the indexes */ 1975 if (vq_is_packed(dev)) { 1976 /* 1977 * Bit[0:14]: avail index 1978 * Bit[15]: avail wrap counter 1979 */ 1980 val = vq->last_avail_idx & 0x7fff; 1981 val |= vq->avail_wrap_counter << 15; 1982 msg->payload.state.num = val; 1983 } else { 1984 msg->payload.state.num = vq->last_avail_idx; 1985 } 1986 1987 VHOST_LOG_CONFIG(INFO, 1988 "vring base idx:%d file:%d\n", msg->payload.state.index, 1989 msg->payload.state.num); 1990 /* 1991 * Based on current qemu vhost-user implementation, this message is 1992 * sent and only sent in vhost_vring_stop. 1993 * TODO: cleanup the vring, it isn't usable since here. 1994 */ 1995 if (vq->kickfd >= 0) 1996 close(vq->kickfd); 1997 1998 vq->kickfd = VIRTIO_UNINITIALIZED_EVENTFD; 1999 2000 if (vq->callfd >= 0) 2001 close(vq->callfd); 2002 2003 vq->callfd = VIRTIO_UNINITIALIZED_EVENTFD; 2004 2005 vq->signalled_used_valid = false; 2006 2007 if (vq_is_packed(dev)) { 2008 rte_free(vq->shadow_used_packed); 2009 vq->shadow_used_packed = NULL; 2010 } else { 2011 rte_free(vq->shadow_used_split); 2012 vq->shadow_used_split = NULL; 2013 } 2014 2015 rte_free(vq->batch_copy_elems); 2016 vq->batch_copy_elems = NULL; 2017 2018 rte_free(vq->log_cache); 2019 vq->log_cache = NULL; 2020 2021 msg->size = sizeof(msg->payload.state); 2022 msg->fd_num = 0; 2023 2024 vring_invalidate(dev, vq); 2025 2026 return RTE_VHOST_MSG_RESULT_REPLY; 2027 } 2028 2029 /* 2030 * when virtio queues are ready to work, qemu will send us to 2031 * enable the virtio queue pair. 2032 */ 2033 static int 2034 vhost_user_set_vring_enable(struct virtio_net **pdev, 2035 struct VhostUserMsg *msg, 2036 int main_fd __rte_unused) 2037 { 2038 struct virtio_net *dev = *pdev; 2039 bool enable = !!msg->payload.state.num; 2040 int index = (int)msg->payload.state.index; 2041 2042 if (validate_msg_fds(msg, 0) != 0) 2043 return RTE_VHOST_MSG_RESULT_ERR; 2044 2045 VHOST_LOG_CONFIG(INFO, 2046 "set queue enable: %d to qp idx: %d\n", 2047 enable, index); 2048 2049 if (enable && dev->virtqueue[index]->async_registered) { 2050 if (dev->virtqueue[index]->async_pkts_inflight_n) { 2051 VHOST_LOG_CONFIG(ERR, "failed to enable vring. " 2052 "async inflight packets must be completed first\n"); 2053 return RTE_VHOST_MSG_RESULT_ERR; 2054 } 2055 } 2056 2057 dev->virtqueue[index]->enabled = enable; 2058 2059 return RTE_VHOST_MSG_RESULT_OK; 2060 } 2061 2062 static int 2063 vhost_user_get_protocol_features(struct virtio_net **pdev, 2064 struct VhostUserMsg *msg, 2065 int main_fd __rte_unused) 2066 { 2067 struct virtio_net *dev = *pdev; 2068 uint64_t features, protocol_features; 2069 2070 if (validate_msg_fds(msg, 0) != 0) 2071 return RTE_VHOST_MSG_RESULT_ERR; 2072 2073 rte_vhost_driver_get_features(dev->ifname, &features); 2074 rte_vhost_driver_get_protocol_features(dev->ifname, &protocol_features); 2075 2076 msg->payload.u64 = protocol_features; 2077 msg->size = sizeof(msg->payload.u64); 2078 msg->fd_num = 0; 2079 2080 return RTE_VHOST_MSG_RESULT_REPLY; 2081 } 2082 2083 static int 2084 vhost_user_set_protocol_features(struct virtio_net **pdev, 2085 struct VhostUserMsg *msg, 2086 int main_fd __rte_unused) 2087 { 2088 struct virtio_net *dev = *pdev; 2089 uint64_t protocol_features = msg->payload.u64; 2090 uint64_t slave_protocol_features = 0; 2091 2092 if (validate_msg_fds(msg, 0) != 0) 2093 return RTE_VHOST_MSG_RESULT_ERR; 2094 2095 rte_vhost_driver_get_protocol_features(dev->ifname, 2096 &slave_protocol_features); 2097 if (protocol_features & ~slave_protocol_features) { 2098 VHOST_LOG_CONFIG(ERR, 2099 "(%d) received invalid protocol features.\n", 2100 dev->vid); 2101 return RTE_VHOST_MSG_RESULT_ERR; 2102 } 2103 2104 dev->protocol_features = protocol_features; 2105 VHOST_LOG_CONFIG(INFO, 2106 "negotiated Vhost-user protocol features: 0x%" PRIx64 "\n", 2107 dev->protocol_features); 2108 2109 return RTE_VHOST_MSG_RESULT_OK; 2110 } 2111 2112 static int 2113 vhost_user_set_log_base(struct virtio_net **pdev, struct VhostUserMsg *msg, 2114 int main_fd __rte_unused) 2115 { 2116 struct virtio_net *dev = *pdev; 2117 int fd = msg->fds[0]; 2118 uint64_t size, off; 2119 void *addr; 2120 uint32_t i; 2121 2122 if (validate_msg_fds(msg, 1) != 0) 2123 return RTE_VHOST_MSG_RESULT_ERR; 2124 2125 if (fd < 0) { 2126 VHOST_LOG_CONFIG(ERR, "invalid log fd: %d\n", fd); 2127 return RTE_VHOST_MSG_RESULT_ERR; 2128 } 2129 2130 if (msg->size != sizeof(VhostUserLog)) { 2131 VHOST_LOG_CONFIG(ERR, 2132 "invalid log base msg size: %"PRId32" != %d\n", 2133 msg->size, (int)sizeof(VhostUserLog)); 2134 goto close_msg_fds; 2135 } 2136 2137 size = msg->payload.log.mmap_size; 2138 off = msg->payload.log.mmap_offset; 2139 2140 /* Check for mmap size and offset overflow. */ 2141 if (off >= -size) { 2142 VHOST_LOG_CONFIG(ERR, 2143 "log offset %#"PRIx64" and log size %#"PRIx64" overflow\n", 2144 off, size); 2145 goto close_msg_fds; 2146 } 2147 2148 VHOST_LOG_CONFIG(INFO, 2149 "log mmap size: %"PRId64", offset: %"PRId64"\n", 2150 size, off); 2151 2152 /* 2153 * mmap from 0 to workaround a hugepage mmap bug: mmap will 2154 * fail when offset is not page size aligned. 2155 */ 2156 addr = mmap(0, size + off, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); 2157 close(fd); 2158 if (addr == MAP_FAILED) { 2159 VHOST_LOG_CONFIG(ERR, "mmap log base failed!\n"); 2160 return RTE_VHOST_MSG_RESULT_ERR; 2161 } 2162 2163 /* 2164 * Free previously mapped log memory on occasionally 2165 * multiple VHOST_USER_SET_LOG_BASE. 2166 */ 2167 if (dev->log_addr) { 2168 munmap((void *)(uintptr_t)dev->log_addr, dev->log_size); 2169 } 2170 dev->log_addr = (uint64_t)(uintptr_t)addr; 2171 dev->log_base = dev->log_addr + off; 2172 dev->log_size = size; 2173 2174 for (i = 0; i < dev->nr_vring; i++) { 2175 struct vhost_virtqueue *vq = dev->virtqueue[i]; 2176 2177 rte_free(vq->log_cache); 2178 vq->log_cache = NULL; 2179 vq->log_cache_nb_elem = 0; 2180 vq->log_cache = rte_zmalloc("vq log cache", 2181 sizeof(struct log_cache_entry) * VHOST_LOG_CACHE_NR, 2182 0); 2183 /* 2184 * If log cache alloc fail, don't fail migration, but no 2185 * caching will be done, which will impact performance 2186 */ 2187 if (!vq->log_cache) 2188 VHOST_LOG_CONFIG(ERR, "Failed to allocate VQ logging cache\n"); 2189 } 2190 2191 /* 2192 * The spec is not clear about it (yet), but QEMU doesn't expect 2193 * any payload in the reply. 2194 */ 2195 msg->size = 0; 2196 msg->fd_num = 0; 2197 2198 return RTE_VHOST_MSG_RESULT_REPLY; 2199 2200 close_msg_fds: 2201 close_msg_fds(msg); 2202 return RTE_VHOST_MSG_RESULT_ERR; 2203 } 2204 2205 static int vhost_user_set_log_fd(struct virtio_net **pdev __rte_unused, 2206 struct VhostUserMsg *msg, 2207 int main_fd __rte_unused) 2208 { 2209 if (validate_msg_fds(msg, 1) != 0) 2210 return RTE_VHOST_MSG_RESULT_ERR; 2211 2212 close(msg->fds[0]); 2213 VHOST_LOG_CONFIG(INFO, "not implemented.\n"); 2214 2215 return RTE_VHOST_MSG_RESULT_OK; 2216 } 2217 2218 /* 2219 * An rarp packet is constructed and broadcasted to notify switches about 2220 * the new location of the migrated VM, so that packets from outside will 2221 * not be lost after migration. 2222 * 2223 * However, we don't actually "send" a rarp packet here, instead, we set 2224 * a flag 'broadcast_rarp' to let rte_vhost_dequeue_burst() inject it. 2225 */ 2226 static int 2227 vhost_user_send_rarp(struct virtio_net **pdev, struct VhostUserMsg *msg, 2228 int main_fd __rte_unused) 2229 { 2230 struct virtio_net *dev = *pdev; 2231 uint8_t *mac = (uint8_t *)&msg->payload.u64; 2232 struct rte_vdpa_device *vdpa_dev; 2233 2234 if (validate_msg_fds(msg, 0) != 0) 2235 return RTE_VHOST_MSG_RESULT_ERR; 2236 2237 VHOST_LOG_CONFIG(DEBUG, 2238 ":: mac: %02x:%02x:%02x:%02x:%02x:%02x\n", 2239 mac[0], mac[1], mac[2], mac[3], mac[4], mac[5]); 2240 memcpy(dev->mac.addr_bytes, mac, 6); 2241 2242 /* 2243 * Set the flag to inject a RARP broadcast packet at 2244 * rte_vhost_dequeue_burst(). 2245 * 2246 * __ATOMIC_RELEASE ordering is for making sure the mac is 2247 * copied before the flag is set. 2248 */ 2249 __atomic_store_n(&dev->broadcast_rarp, 1, __ATOMIC_RELEASE); 2250 vdpa_dev = dev->vdpa_dev; 2251 if (vdpa_dev && vdpa_dev->ops->migration_done) 2252 vdpa_dev->ops->migration_done(dev->vid); 2253 2254 return RTE_VHOST_MSG_RESULT_OK; 2255 } 2256 2257 static int 2258 vhost_user_net_set_mtu(struct virtio_net **pdev, struct VhostUserMsg *msg, 2259 int main_fd __rte_unused) 2260 { 2261 struct virtio_net *dev = *pdev; 2262 2263 if (validate_msg_fds(msg, 0) != 0) 2264 return RTE_VHOST_MSG_RESULT_ERR; 2265 2266 if (msg->payload.u64 < VIRTIO_MIN_MTU || 2267 msg->payload.u64 > VIRTIO_MAX_MTU) { 2268 VHOST_LOG_CONFIG(ERR, "Invalid MTU size (%"PRIu64")\n", 2269 msg->payload.u64); 2270 2271 return RTE_VHOST_MSG_RESULT_ERR; 2272 } 2273 2274 dev->mtu = msg->payload.u64; 2275 2276 return RTE_VHOST_MSG_RESULT_OK; 2277 } 2278 2279 static int 2280 vhost_user_set_req_fd(struct virtio_net **pdev, struct VhostUserMsg *msg, 2281 int main_fd __rte_unused) 2282 { 2283 struct virtio_net *dev = *pdev; 2284 int fd = msg->fds[0]; 2285 2286 if (validate_msg_fds(msg, 1) != 0) 2287 return RTE_VHOST_MSG_RESULT_ERR; 2288 2289 if (fd < 0) { 2290 VHOST_LOG_CONFIG(ERR, 2291 "Invalid file descriptor for slave channel (%d)\n", 2292 fd); 2293 return RTE_VHOST_MSG_RESULT_ERR; 2294 } 2295 2296 if (dev->slave_req_fd >= 0) 2297 close(dev->slave_req_fd); 2298 2299 dev->slave_req_fd = fd; 2300 2301 return RTE_VHOST_MSG_RESULT_OK; 2302 } 2303 2304 static int 2305 is_vring_iotlb_split(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg) 2306 { 2307 struct vhost_vring_addr *ra; 2308 uint64_t start, end, len; 2309 2310 start = imsg->iova; 2311 end = start + imsg->size; 2312 2313 ra = &vq->ring_addrs; 2314 len = sizeof(struct vring_desc) * vq->size; 2315 if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start) 2316 return 1; 2317 2318 len = sizeof(struct vring_avail) + sizeof(uint16_t) * vq->size; 2319 if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start) 2320 return 1; 2321 2322 len = sizeof(struct vring_used) + 2323 sizeof(struct vring_used_elem) * vq->size; 2324 if (ra->used_user_addr < end && (ra->used_user_addr + len) > start) 2325 return 1; 2326 2327 if (ra->flags & (1 << VHOST_VRING_F_LOG)) { 2328 len = sizeof(uint64_t); 2329 if (ra->log_guest_addr < end && 2330 (ra->log_guest_addr + len) > start) 2331 return 1; 2332 } 2333 2334 return 0; 2335 } 2336 2337 static int 2338 is_vring_iotlb_packed(struct vhost_virtqueue *vq, struct vhost_iotlb_msg *imsg) 2339 { 2340 struct vhost_vring_addr *ra; 2341 uint64_t start, end, len; 2342 2343 start = imsg->iova; 2344 end = start + imsg->size; 2345 2346 ra = &vq->ring_addrs; 2347 len = sizeof(struct vring_packed_desc) * vq->size; 2348 if (ra->desc_user_addr < end && (ra->desc_user_addr + len) > start) 2349 return 1; 2350 2351 len = sizeof(struct vring_packed_desc_event); 2352 if (ra->avail_user_addr < end && (ra->avail_user_addr + len) > start) 2353 return 1; 2354 2355 len = sizeof(struct vring_packed_desc_event); 2356 if (ra->used_user_addr < end && (ra->used_user_addr + len) > start) 2357 return 1; 2358 2359 if (ra->flags & (1 << VHOST_VRING_F_LOG)) { 2360 len = sizeof(uint64_t); 2361 if (ra->log_guest_addr < end && 2362 (ra->log_guest_addr + len) > start) 2363 return 1; 2364 } 2365 2366 return 0; 2367 } 2368 2369 static int is_vring_iotlb(struct virtio_net *dev, 2370 struct vhost_virtqueue *vq, 2371 struct vhost_iotlb_msg *imsg) 2372 { 2373 if (vq_is_packed(dev)) 2374 return is_vring_iotlb_packed(vq, imsg); 2375 else 2376 return is_vring_iotlb_split(vq, imsg); 2377 } 2378 2379 static int 2380 vhost_user_iotlb_msg(struct virtio_net **pdev, struct VhostUserMsg *msg, 2381 int main_fd __rte_unused) 2382 { 2383 struct virtio_net *dev = *pdev; 2384 struct vhost_iotlb_msg *imsg = &msg->payload.iotlb; 2385 uint16_t i; 2386 uint64_t vva, len; 2387 2388 if (validate_msg_fds(msg, 0) != 0) 2389 return RTE_VHOST_MSG_RESULT_ERR; 2390 2391 switch (imsg->type) { 2392 case VHOST_IOTLB_UPDATE: 2393 len = imsg->size; 2394 vva = qva_to_vva(dev, imsg->uaddr, &len); 2395 if (!vva) 2396 return RTE_VHOST_MSG_RESULT_ERR; 2397 2398 for (i = 0; i < dev->nr_vring; i++) { 2399 struct vhost_virtqueue *vq = dev->virtqueue[i]; 2400 2401 if (!vq) 2402 continue; 2403 2404 vhost_user_iotlb_cache_insert(vq, imsg->iova, vva, 2405 len, imsg->perm); 2406 2407 if (is_vring_iotlb(dev, vq, imsg)) 2408 *pdev = dev = translate_ring_addresses(dev, i); 2409 } 2410 break; 2411 case VHOST_IOTLB_INVALIDATE: 2412 for (i = 0; i < dev->nr_vring; i++) { 2413 struct vhost_virtqueue *vq = dev->virtqueue[i]; 2414 2415 if (!vq) 2416 continue; 2417 2418 vhost_user_iotlb_cache_remove(vq, imsg->iova, 2419 imsg->size); 2420 2421 if (is_vring_iotlb(dev, vq, imsg)) 2422 vring_invalidate(dev, vq); 2423 } 2424 break; 2425 default: 2426 VHOST_LOG_CONFIG(ERR, "Invalid IOTLB message type (%d)\n", 2427 imsg->type); 2428 return RTE_VHOST_MSG_RESULT_ERR; 2429 } 2430 2431 return RTE_VHOST_MSG_RESULT_OK; 2432 } 2433 2434 static int 2435 vhost_user_set_postcopy_advise(struct virtio_net **pdev, 2436 struct VhostUserMsg *msg, 2437 int main_fd __rte_unused) 2438 { 2439 struct virtio_net *dev = *pdev; 2440 #ifdef RTE_LIBRTE_VHOST_POSTCOPY 2441 struct uffdio_api api_struct; 2442 2443 if (validate_msg_fds(msg, 0) != 0) 2444 return RTE_VHOST_MSG_RESULT_ERR; 2445 2446 dev->postcopy_ufd = syscall(__NR_userfaultfd, O_CLOEXEC | O_NONBLOCK); 2447 2448 if (dev->postcopy_ufd == -1) { 2449 VHOST_LOG_CONFIG(ERR, "Userfaultfd not available: %s\n", 2450 strerror(errno)); 2451 return RTE_VHOST_MSG_RESULT_ERR; 2452 } 2453 api_struct.api = UFFD_API; 2454 api_struct.features = 0; 2455 if (ioctl(dev->postcopy_ufd, UFFDIO_API, &api_struct)) { 2456 VHOST_LOG_CONFIG(ERR, "UFFDIO_API ioctl failure: %s\n", 2457 strerror(errno)); 2458 close(dev->postcopy_ufd); 2459 dev->postcopy_ufd = -1; 2460 return RTE_VHOST_MSG_RESULT_ERR; 2461 } 2462 msg->fds[0] = dev->postcopy_ufd; 2463 msg->fd_num = 1; 2464 2465 return RTE_VHOST_MSG_RESULT_REPLY; 2466 #else 2467 dev->postcopy_ufd = -1; 2468 msg->fd_num = 0; 2469 2470 return RTE_VHOST_MSG_RESULT_ERR; 2471 #endif 2472 } 2473 2474 static int 2475 vhost_user_set_postcopy_listen(struct virtio_net **pdev, 2476 struct VhostUserMsg *msg __rte_unused, 2477 int main_fd __rte_unused) 2478 { 2479 struct virtio_net *dev = *pdev; 2480 2481 if (validate_msg_fds(msg, 0) != 0) 2482 return RTE_VHOST_MSG_RESULT_ERR; 2483 2484 if (dev->mem && dev->mem->nregions) { 2485 VHOST_LOG_CONFIG(ERR, 2486 "Regions already registered at postcopy-listen\n"); 2487 return RTE_VHOST_MSG_RESULT_ERR; 2488 } 2489 dev->postcopy_listening = 1; 2490 2491 return RTE_VHOST_MSG_RESULT_OK; 2492 } 2493 2494 static int 2495 vhost_user_postcopy_end(struct virtio_net **pdev, struct VhostUserMsg *msg, 2496 int main_fd __rte_unused) 2497 { 2498 struct virtio_net *dev = *pdev; 2499 2500 if (validate_msg_fds(msg, 0) != 0) 2501 return RTE_VHOST_MSG_RESULT_ERR; 2502 2503 dev->postcopy_listening = 0; 2504 if (dev->postcopy_ufd >= 0) { 2505 close(dev->postcopy_ufd); 2506 dev->postcopy_ufd = -1; 2507 } 2508 2509 msg->payload.u64 = 0; 2510 msg->size = sizeof(msg->payload.u64); 2511 msg->fd_num = 0; 2512 2513 return RTE_VHOST_MSG_RESULT_REPLY; 2514 } 2515 2516 static int 2517 vhost_user_get_status(struct virtio_net **pdev, struct VhostUserMsg *msg, 2518 int main_fd __rte_unused) 2519 { 2520 struct virtio_net *dev = *pdev; 2521 2522 if (validate_msg_fds(msg, 0) != 0) 2523 return RTE_VHOST_MSG_RESULT_ERR; 2524 2525 msg->payload.u64 = dev->status; 2526 msg->size = sizeof(msg->payload.u64); 2527 msg->fd_num = 0; 2528 2529 return RTE_VHOST_MSG_RESULT_REPLY; 2530 } 2531 2532 static int 2533 vhost_user_set_status(struct virtio_net **pdev, struct VhostUserMsg *msg, 2534 int main_fd __rte_unused) 2535 { 2536 struct virtio_net *dev = *pdev; 2537 2538 if (validate_msg_fds(msg, 0) != 0) 2539 return RTE_VHOST_MSG_RESULT_ERR; 2540 2541 /* As per Virtio specification, the device status is 8bits long */ 2542 if (msg->payload.u64 > UINT8_MAX) { 2543 VHOST_LOG_CONFIG(ERR, "Invalid VHOST_USER_SET_STATUS payload 0x%" PRIx64 "\n", 2544 msg->payload.u64); 2545 return RTE_VHOST_MSG_RESULT_ERR; 2546 } 2547 2548 dev->status = msg->payload.u64; 2549 2550 if ((dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK) && 2551 (dev->flags & VIRTIO_DEV_FEATURES_FAILED)) { 2552 VHOST_LOG_CONFIG(ERR, "FEATURES_OK bit is set but feature negotiation failed\n"); 2553 /* 2554 * Clear the bit to let the driver know about the feature 2555 * negotiation failure 2556 */ 2557 dev->status &= ~VIRTIO_DEVICE_STATUS_FEATURES_OK; 2558 } 2559 2560 VHOST_LOG_CONFIG(INFO, "New device status(0x%08x):\n" 2561 "\t-RESET: %u\n" 2562 "\t-ACKNOWLEDGE: %u\n" 2563 "\t-DRIVER: %u\n" 2564 "\t-FEATURES_OK: %u\n" 2565 "\t-DRIVER_OK: %u\n" 2566 "\t-DEVICE_NEED_RESET: %u\n" 2567 "\t-FAILED: %u\n", 2568 dev->status, 2569 (dev->status == VIRTIO_DEVICE_STATUS_RESET), 2570 !!(dev->status & VIRTIO_DEVICE_STATUS_ACK), 2571 !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER), 2572 !!(dev->status & VIRTIO_DEVICE_STATUS_FEATURES_OK), 2573 !!(dev->status & VIRTIO_DEVICE_STATUS_DRIVER_OK), 2574 !!(dev->status & VIRTIO_DEVICE_STATUS_DEV_NEED_RESET), 2575 !!(dev->status & VIRTIO_DEVICE_STATUS_FAILED)); 2576 2577 return RTE_VHOST_MSG_RESULT_OK; 2578 } 2579 2580 typedef int (*vhost_message_handler_t)(struct virtio_net **pdev, 2581 struct VhostUserMsg *msg, 2582 int main_fd); 2583 static vhost_message_handler_t vhost_message_handlers[VHOST_USER_MAX] = { 2584 [VHOST_USER_NONE] = NULL, 2585 [VHOST_USER_GET_FEATURES] = vhost_user_get_features, 2586 [VHOST_USER_SET_FEATURES] = vhost_user_set_features, 2587 [VHOST_USER_SET_OWNER] = vhost_user_set_owner, 2588 [VHOST_USER_RESET_OWNER] = vhost_user_reset_owner, 2589 [VHOST_USER_SET_MEM_TABLE] = vhost_user_set_mem_table, 2590 [VHOST_USER_SET_LOG_BASE] = vhost_user_set_log_base, 2591 [VHOST_USER_SET_LOG_FD] = vhost_user_set_log_fd, 2592 [VHOST_USER_SET_VRING_NUM] = vhost_user_set_vring_num, 2593 [VHOST_USER_SET_VRING_ADDR] = vhost_user_set_vring_addr, 2594 [VHOST_USER_SET_VRING_BASE] = vhost_user_set_vring_base, 2595 [VHOST_USER_GET_VRING_BASE] = vhost_user_get_vring_base, 2596 [VHOST_USER_SET_VRING_KICK] = vhost_user_set_vring_kick, 2597 [VHOST_USER_SET_VRING_CALL] = vhost_user_set_vring_call, 2598 [VHOST_USER_SET_VRING_ERR] = vhost_user_set_vring_err, 2599 [VHOST_USER_GET_PROTOCOL_FEATURES] = vhost_user_get_protocol_features, 2600 [VHOST_USER_SET_PROTOCOL_FEATURES] = vhost_user_set_protocol_features, 2601 [VHOST_USER_GET_QUEUE_NUM] = vhost_user_get_queue_num, 2602 [VHOST_USER_SET_VRING_ENABLE] = vhost_user_set_vring_enable, 2603 [VHOST_USER_SEND_RARP] = vhost_user_send_rarp, 2604 [VHOST_USER_NET_SET_MTU] = vhost_user_net_set_mtu, 2605 [VHOST_USER_SET_SLAVE_REQ_FD] = vhost_user_set_req_fd, 2606 [VHOST_USER_IOTLB_MSG] = vhost_user_iotlb_msg, 2607 [VHOST_USER_POSTCOPY_ADVISE] = vhost_user_set_postcopy_advise, 2608 [VHOST_USER_POSTCOPY_LISTEN] = vhost_user_set_postcopy_listen, 2609 [VHOST_USER_POSTCOPY_END] = vhost_user_postcopy_end, 2610 [VHOST_USER_GET_INFLIGHT_FD] = vhost_user_get_inflight_fd, 2611 [VHOST_USER_SET_INFLIGHT_FD] = vhost_user_set_inflight_fd, 2612 [VHOST_USER_SET_STATUS] = vhost_user_set_status, 2613 [VHOST_USER_GET_STATUS] = vhost_user_get_status, 2614 }; 2615 2616 /* return bytes# of read on success or negative val on failure. */ 2617 static int 2618 read_vhost_message(int sockfd, struct VhostUserMsg *msg) 2619 { 2620 int ret; 2621 2622 ret = read_fd_message(sockfd, (char *)msg, VHOST_USER_HDR_SIZE, 2623 msg->fds, VHOST_MEMORY_MAX_NREGIONS, &msg->fd_num); 2624 if (ret <= 0) { 2625 return ret; 2626 } else if (ret != VHOST_USER_HDR_SIZE) { 2627 VHOST_LOG_CONFIG(ERR, "Unexpected header size read\n"); 2628 close_msg_fds(msg); 2629 return -1; 2630 } 2631 2632 if (msg->size) { 2633 if (msg->size > sizeof(msg->payload)) { 2634 VHOST_LOG_CONFIG(ERR, 2635 "invalid msg size: %d\n", msg->size); 2636 return -1; 2637 } 2638 ret = read(sockfd, &msg->payload, msg->size); 2639 if (ret <= 0) 2640 return ret; 2641 if (ret != (int)msg->size) { 2642 VHOST_LOG_CONFIG(ERR, 2643 "read control message failed\n"); 2644 return -1; 2645 } 2646 } 2647 2648 return ret; 2649 } 2650 2651 static int 2652 send_vhost_message(int sockfd, struct VhostUserMsg *msg) 2653 { 2654 if (!msg) 2655 return 0; 2656 2657 return send_fd_message(sockfd, (char *)msg, 2658 VHOST_USER_HDR_SIZE + msg->size, msg->fds, msg->fd_num); 2659 } 2660 2661 static int 2662 send_vhost_reply(int sockfd, struct VhostUserMsg *msg) 2663 { 2664 if (!msg) 2665 return 0; 2666 2667 msg->flags &= ~VHOST_USER_VERSION_MASK; 2668 msg->flags &= ~VHOST_USER_NEED_REPLY; 2669 msg->flags |= VHOST_USER_VERSION; 2670 msg->flags |= VHOST_USER_REPLY_MASK; 2671 2672 return send_vhost_message(sockfd, msg); 2673 } 2674 2675 static int 2676 send_vhost_slave_message(struct virtio_net *dev, struct VhostUserMsg *msg) 2677 { 2678 int ret; 2679 2680 if (msg->flags & VHOST_USER_NEED_REPLY) 2681 rte_spinlock_lock(&dev->slave_req_lock); 2682 2683 ret = send_vhost_message(dev->slave_req_fd, msg); 2684 if (ret < 0 && (msg->flags & VHOST_USER_NEED_REPLY)) 2685 rte_spinlock_unlock(&dev->slave_req_lock); 2686 2687 return ret; 2688 } 2689 2690 /* 2691 * Allocate a queue pair if it hasn't been allocated yet 2692 */ 2693 static int 2694 vhost_user_check_and_alloc_queue_pair(struct virtio_net *dev, 2695 struct VhostUserMsg *msg) 2696 { 2697 uint32_t vring_idx; 2698 2699 switch (msg->request.master) { 2700 case VHOST_USER_SET_VRING_KICK: 2701 case VHOST_USER_SET_VRING_CALL: 2702 case VHOST_USER_SET_VRING_ERR: 2703 vring_idx = msg->payload.u64 & VHOST_USER_VRING_IDX_MASK; 2704 break; 2705 case VHOST_USER_SET_VRING_NUM: 2706 case VHOST_USER_SET_VRING_BASE: 2707 case VHOST_USER_SET_VRING_ENABLE: 2708 vring_idx = msg->payload.state.index; 2709 break; 2710 case VHOST_USER_SET_VRING_ADDR: 2711 vring_idx = msg->payload.addr.index; 2712 break; 2713 default: 2714 return 0; 2715 } 2716 2717 if (vring_idx >= VHOST_MAX_VRING) { 2718 VHOST_LOG_CONFIG(ERR, 2719 "invalid vring index: %u\n", vring_idx); 2720 return -1; 2721 } 2722 2723 if (dev->virtqueue[vring_idx]) 2724 return 0; 2725 2726 return alloc_vring_queue(dev, vring_idx); 2727 } 2728 2729 static void 2730 vhost_user_lock_all_queue_pairs(struct virtio_net *dev) 2731 { 2732 unsigned int i = 0; 2733 unsigned int vq_num = 0; 2734 2735 while (vq_num < dev->nr_vring) { 2736 struct vhost_virtqueue *vq = dev->virtqueue[i]; 2737 2738 if (vq) { 2739 rte_spinlock_lock(&vq->access_lock); 2740 vq_num++; 2741 } 2742 i++; 2743 } 2744 } 2745 2746 static void 2747 vhost_user_unlock_all_queue_pairs(struct virtio_net *dev) 2748 { 2749 unsigned int i = 0; 2750 unsigned int vq_num = 0; 2751 2752 while (vq_num < dev->nr_vring) { 2753 struct vhost_virtqueue *vq = dev->virtqueue[i]; 2754 2755 if (vq) { 2756 rte_spinlock_unlock(&vq->access_lock); 2757 vq_num++; 2758 } 2759 i++; 2760 } 2761 } 2762 2763 int 2764 vhost_user_msg_handler(int vid, int fd) 2765 { 2766 struct virtio_net *dev; 2767 struct VhostUserMsg msg; 2768 struct rte_vdpa_device *vdpa_dev; 2769 int ret; 2770 int unlock_required = 0; 2771 bool handled; 2772 int request; 2773 uint32_t i; 2774 2775 dev = get_device(vid); 2776 if (dev == NULL) 2777 return -1; 2778 2779 if (!dev->notify_ops) { 2780 dev->notify_ops = vhost_driver_callback_get(dev->ifname); 2781 if (!dev->notify_ops) { 2782 VHOST_LOG_CONFIG(ERR, 2783 "failed to get callback ops for driver %s\n", 2784 dev->ifname); 2785 return -1; 2786 } 2787 } 2788 2789 ret = read_vhost_message(fd, &msg); 2790 if (ret <= 0) { 2791 if (ret < 0) 2792 VHOST_LOG_CONFIG(ERR, 2793 "vhost read message failed\n"); 2794 else 2795 VHOST_LOG_CONFIG(INFO, 2796 "vhost peer closed\n"); 2797 2798 return -1; 2799 } 2800 2801 ret = 0; 2802 request = msg.request.master; 2803 if (request > VHOST_USER_NONE && request < VHOST_USER_MAX && 2804 vhost_message_str[request]) { 2805 if (request != VHOST_USER_IOTLB_MSG) 2806 VHOST_LOG_CONFIG(INFO, "read message %s\n", 2807 vhost_message_str[request]); 2808 else 2809 VHOST_LOG_CONFIG(DEBUG, "read message %s\n", 2810 vhost_message_str[request]); 2811 } else { 2812 VHOST_LOG_CONFIG(DEBUG, "External request %d\n", request); 2813 } 2814 2815 ret = vhost_user_check_and_alloc_queue_pair(dev, &msg); 2816 if (ret < 0) { 2817 VHOST_LOG_CONFIG(ERR, 2818 "failed to alloc queue\n"); 2819 return -1; 2820 } 2821 2822 /* 2823 * Note: we don't lock all queues on VHOST_USER_GET_VRING_BASE 2824 * and VHOST_USER_RESET_OWNER, since it is sent when virtio stops 2825 * and device is destroyed. destroy_device waits for queues to be 2826 * inactive, so it is safe. Otherwise taking the access_lock 2827 * would cause a dead lock. 2828 */ 2829 switch (request) { 2830 case VHOST_USER_SET_FEATURES: 2831 case VHOST_USER_SET_PROTOCOL_FEATURES: 2832 case VHOST_USER_SET_OWNER: 2833 case VHOST_USER_SET_MEM_TABLE: 2834 case VHOST_USER_SET_LOG_BASE: 2835 case VHOST_USER_SET_LOG_FD: 2836 case VHOST_USER_SET_VRING_NUM: 2837 case VHOST_USER_SET_VRING_ADDR: 2838 case VHOST_USER_SET_VRING_BASE: 2839 case VHOST_USER_SET_VRING_KICK: 2840 case VHOST_USER_SET_VRING_CALL: 2841 case VHOST_USER_SET_VRING_ERR: 2842 case VHOST_USER_SET_VRING_ENABLE: 2843 case VHOST_USER_SEND_RARP: 2844 case VHOST_USER_NET_SET_MTU: 2845 case VHOST_USER_SET_SLAVE_REQ_FD: 2846 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) { 2847 vhost_user_lock_all_queue_pairs(dev); 2848 unlock_required = 1; 2849 } 2850 break; 2851 default: 2852 break; 2853 2854 } 2855 2856 handled = false; 2857 if (dev->extern_ops.pre_msg_handle) { 2858 ret = (*dev->extern_ops.pre_msg_handle)(dev->vid, 2859 (void *)&msg); 2860 switch (ret) { 2861 case RTE_VHOST_MSG_RESULT_REPLY: 2862 send_vhost_reply(fd, &msg); 2863 /* Fall-through */ 2864 case RTE_VHOST_MSG_RESULT_ERR: 2865 case RTE_VHOST_MSG_RESULT_OK: 2866 handled = true; 2867 goto skip_to_post_handle; 2868 case RTE_VHOST_MSG_RESULT_NOT_HANDLED: 2869 default: 2870 break; 2871 } 2872 } 2873 2874 if (request > VHOST_USER_NONE && request < VHOST_USER_MAX) { 2875 if (!vhost_message_handlers[request]) 2876 goto skip_to_post_handle; 2877 ret = vhost_message_handlers[request](&dev, &msg, fd); 2878 2879 switch (ret) { 2880 case RTE_VHOST_MSG_RESULT_ERR: 2881 VHOST_LOG_CONFIG(ERR, 2882 "Processing %s failed.\n", 2883 vhost_message_str[request]); 2884 handled = true; 2885 break; 2886 case RTE_VHOST_MSG_RESULT_OK: 2887 VHOST_LOG_CONFIG(DEBUG, 2888 "Processing %s succeeded.\n", 2889 vhost_message_str[request]); 2890 handled = true; 2891 break; 2892 case RTE_VHOST_MSG_RESULT_REPLY: 2893 VHOST_LOG_CONFIG(DEBUG, 2894 "Processing %s succeeded and needs reply.\n", 2895 vhost_message_str[request]); 2896 send_vhost_reply(fd, &msg); 2897 handled = true; 2898 break; 2899 default: 2900 break; 2901 } 2902 } 2903 2904 skip_to_post_handle: 2905 if (ret != RTE_VHOST_MSG_RESULT_ERR && 2906 dev->extern_ops.post_msg_handle) { 2907 ret = (*dev->extern_ops.post_msg_handle)(dev->vid, 2908 (void *)&msg); 2909 switch (ret) { 2910 case RTE_VHOST_MSG_RESULT_REPLY: 2911 send_vhost_reply(fd, &msg); 2912 /* Fall-through */ 2913 case RTE_VHOST_MSG_RESULT_ERR: 2914 case RTE_VHOST_MSG_RESULT_OK: 2915 handled = true; 2916 case RTE_VHOST_MSG_RESULT_NOT_HANDLED: 2917 default: 2918 break; 2919 } 2920 } 2921 2922 if (unlock_required) 2923 vhost_user_unlock_all_queue_pairs(dev); 2924 2925 /* If message was not handled at this stage, treat it as an error */ 2926 if (!handled) { 2927 VHOST_LOG_CONFIG(ERR, 2928 "vhost message (req: %d) was not handled.\n", request); 2929 close_msg_fds(&msg); 2930 ret = RTE_VHOST_MSG_RESULT_ERR; 2931 } 2932 2933 /* 2934 * If the request required a reply that was already sent, 2935 * this optional reply-ack won't be sent as the 2936 * VHOST_USER_NEED_REPLY was cleared in send_vhost_reply(). 2937 */ 2938 if (msg.flags & VHOST_USER_NEED_REPLY) { 2939 msg.payload.u64 = ret == RTE_VHOST_MSG_RESULT_ERR; 2940 msg.size = sizeof(msg.payload.u64); 2941 msg.fd_num = 0; 2942 send_vhost_reply(fd, &msg); 2943 } else if (ret == RTE_VHOST_MSG_RESULT_ERR) { 2944 VHOST_LOG_CONFIG(ERR, 2945 "vhost message handling failed.\n"); 2946 return -1; 2947 } 2948 2949 for (i = 0; i < dev->nr_vring; i++) { 2950 struct vhost_virtqueue *vq = dev->virtqueue[i]; 2951 bool cur_ready = vq_is_ready(dev, vq); 2952 2953 if (cur_ready != (vq && vq->ready)) { 2954 vq->ready = cur_ready; 2955 vhost_user_notify_queue_state(dev, i, cur_ready); 2956 } 2957 } 2958 2959 2960 if (!virtio_is_ready(dev)) 2961 goto out; 2962 2963 /* 2964 * Virtio is now ready. If not done already, it is time 2965 * to notify the application it can process the rings and 2966 * configure the vDPA device if present. 2967 */ 2968 2969 if (!(dev->flags & VIRTIO_DEV_RUNNING)) { 2970 if (dev->notify_ops->new_device(dev->vid) == 0) 2971 dev->flags |= VIRTIO_DEV_RUNNING; 2972 } 2973 2974 vdpa_dev = dev->vdpa_dev; 2975 if (!vdpa_dev) 2976 goto out; 2977 2978 if (!(dev->flags & VIRTIO_DEV_VDPA_CONFIGURED)) { 2979 if (vdpa_dev->ops->dev_conf(dev->vid)) 2980 VHOST_LOG_CONFIG(ERR, 2981 "Failed to configure vDPA device\n"); 2982 else 2983 dev->flags |= VIRTIO_DEV_VDPA_CONFIGURED; 2984 } 2985 2986 out: 2987 return 0; 2988 } 2989 2990 static int process_slave_message_reply(struct virtio_net *dev, 2991 const struct VhostUserMsg *msg) 2992 { 2993 struct VhostUserMsg msg_reply; 2994 int ret; 2995 2996 if ((msg->flags & VHOST_USER_NEED_REPLY) == 0) 2997 return 0; 2998 2999 ret = read_vhost_message(dev->slave_req_fd, &msg_reply); 3000 if (ret <= 0) { 3001 if (ret < 0) 3002 VHOST_LOG_CONFIG(ERR, 3003 "vhost read slave message reply failed\n"); 3004 else 3005 VHOST_LOG_CONFIG(INFO, 3006 "vhost peer closed\n"); 3007 ret = -1; 3008 goto out; 3009 } 3010 3011 ret = 0; 3012 if (msg_reply.request.slave != msg->request.slave) { 3013 VHOST_LOG_CONFIG(ERR, 3014 "Received unexpected msg type (%u), expected %u\n", 3015 msg_reply.request.slave, msg->request.slave); 3016 ret = -1; 3017 goto out; 3018 } 3019 3020 ret = msg_reply.payload.u64 ? -1 : 0; 3021 3022 out: 3023 rte_spinlock_unlock(&dev->slave_req_lock); 3024 return ret; 3025 } 3026 3027 int 3028 vhost_user_iotlb_miss(struct virtio_net *dev, uint64_t iova, uint8_t perm) 3029 { 3030 int ret; 3031 struct VhostUserMsg msg = { 3032 .request.slave = VHOST_USER_SLAVE_IOTLB_MSG, 3033 .flags = VHOST_USER_VERSION, 3034 .size = sizeof(msg.payload.iotlb), 3035 .payload.iotlb = { 3036 .iova = iova, 3037 .perm = perm, 3038 .type = VHOST_IOTLB_MISS, 3039 }, 3040 }; 3041 3042 ret = send_vhost_message(dev->slave_req_fd, &msg); 3043 if (ret < 0) { 3044 VHOST_LOG_CONFIG(ERR, 3045 "Failed to send IOTLB miss message (%d)\n", 3046 ret); 3047 return ret; 3048 } 3049 3050 return 0; 3051 } 3052 3053 static int 3054 vhost_user_slave_config_change(struct virtio_net *dev, bool need_reply) 3055 { 3056 int ret; 3057 struct VhostUserMsg msg = { 3058 .request.slave = VHOST_USER_SLAVE_CONFIG_CHANGE_MSG, 3059 .flags = VHOST_USER_VERSION, 3060 .size = 0, 3061 }; 3062 3063 if (need_reply) 3064 msg.flags |= VHOST_USER_NEED_REPLY; 3065 3066 ret = send_vhost_slave_message(dev, &msg); 3067 if (ret < 0) { 3068 VHOST_LOG_CONFIG(ERR, 3069 "Failed to send config change (%d)\n", 3070 ret); 3071 return ret; 3072 } 3073 3074 return process_slave_message_reply(dev, &msg); 3075 } 3076 3077 int 3078 rte_vhost_slave_config_change(int vid, bool need_reply) 3079 { 3080 struct virtio_net *dev; 3081 3082 dev = get_device(vid); 3083 if (!dev) 3084 return -ENODEV; 3085 3086 return vhost_user_slave_config_change(dev, need_reply); 3087 } 3088 3089 static int vhost_user_slave_set_vring_host_notifier(struct virtio_net *dev, 3090 int index, int fd, 3091 uint64_t offset, 3092 uint64_t size) 3093 { 3094 int ret; 3095 struct VhostUserMsg msg = { 3096 .request.slave = VHOST_USER_SLAVE_VRING_HOST_NOTIFIER_MSG, 3097 .flags = VHOST_USER_VERSION | VHOST_USER_NEED_REPLY, 3098 .size = sizeof(msg.payload.area), 3099 .payload.area = { 3100 .u64 = index & VHOST_USER_VRING_IDX_MASK, 3101 .size = size, 3102 .offset = offset, 3103 }, 3104 }; 3105 3106 if (fd < 0) 3107 msg.payload.area.u64 |= VHOST_USER_VRING_NOFD_MASK; 3108 else { 3109 msg.fds[0] = fd; 3110 msg.fd_num = 1; 3111 } 3112 3113 ret = send_vhost_slave_message(dev, &msg); 3114 if (ret < 0) { 3115 VHOST_LOG_CONFIG(ERR, 3116 "Failed to set host notifier (%d)\n", ret); 3117 return ret; 3118 } 3119 3120 return process_slave_message_reply(dev, &msg); 3121 } 3122 3123 int rte_vhost_host_notifier_ctrl(int vid, uint16_t qid, bool enable) 3124 { 3125 struct virtio_net *dev; 3126 struct rte_vdpa_device *vdpa_dev; 3127 int vfio_device_fd, ret = 0; 3128 uint64_t offset, size; 3129 unsigned int i, q_start, q_last; 3130 3131 dev = get_device(vid); 3132 if (!dev) 3133 return -ENODEV; 3134 3135 vdpa_dev = dev->vdpa_dev; 3136 if (vdpa_dev == NULL) 3137 return -ENODEV; 3138 3139 if (!(dev->features & (1ULL << VIRTIO_F_VERSION_1)) || 3140 !(dev->features & (1ULL << VHOST_USER_F_PROTOCOL_FEATURES)) || 3141 !(dev->protocol_features & 3142 (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_REQ)) || 3143 !(dev->protocol_features & 3144 (1ULL << VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) || 3145 !(dev->protocol_features & 3146 (1ULL << VHOST_USER_PROTOCOL_F_HOST_NOTIFIER))) 3147 return -ENOTSUP; 3148 3149 if (qid == RTE_VHOST_QUEUE_ALL) { 3150 q_start = 0; 3151 q_last = dev->nr_vring - 1; 3152 } else { 3153 if (qid >= dev->nr_vring) 3154 return -EINVAL; 3155 q_start = qid; 3156 q_last = qid; 3157 } 3158 3159 RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_vfio_device_fd, -ENOTSUP); 3160 RTE_FUNC_PTR_OR_ERR_RET(vdpa_dev->ops->get_notify_area, -ENOTSUP); 3161 3162 vfio_device_fd = vdpa_dev->ops->get_vfio_device_fd(vid); 3163 if (vfio_device_fd < 0) 3164 return -ENOTSUP; 3165 3166 if (enable) { 3167 for (i = q_start; i <= q_last; i++) { 3168 if (vdpa_dev->ops->get_notify_area(vid, i, &offset, 3169 &size) < 0) { 3170 ret = -ENOTSUP; 3171 goto disable; 3172 } 3173 3174 if (vhost_user_slave_set_vring_host_notifier(dev, i, 3175 vfio_device_fd, offset, size) < 0) { 3176 ret = -EFAULT; 3177 goto disable; 3178 } 3179 } 3180 } else { 3181 disable: 3182 for (i = q_start; i <= q_last; i++) { 3183 vhost_user_slave_set_vring_host_notifier(dev, i, -1, 3184 0, 0); 3185 } 3186 } 3187 3188 return ret; 3189 } 3190