1 /* 2 * vhost transport for vsock 3 * 4 * Copyright (C) 2013-2015 Red Hat, Inc. 5 * Author: Asias He <asias@redhat.com> 6 * Stefan Hajnoczi <stefanha@redhat.com> 7 * 8 * This work is licensed under the terms of the GNU GPL, version 2. 9 */ 10 #include <linux/miscdevice.h> 11 #include <linux/atomic.h> 12 #include <linux/module.h> 13 #include <linux/mutex.h> 14 #include <linux/vmalloc.h> 15 #include <net/sock.h> 16 #include <linux/virtio_vsock.h> 17 #include <linux/vhost.h> 18 19 #include <net/af_vsock.h> 20 #include "vhost.h" 21 22 #define VHOST_VSOCK_DEFAULT_HOST_CID 2 23 24 enum { 25 VHOST_VSOCK_FEATURES = VHOST_FEATURES, 26 }; 27 28 /* Used to track all the vhost_vsock instances on the system. */ 29 static DEFINE_SPINLOCK(vhost_vsock_lock); 30 static LIST_HEAD(vhost_vsock_list); 31 32 struct vhost_vsock { 33 struct vhost_dev dev; 34 struct vhost_virtqueue vqs[2]; 35 36 /* Link to global vhost_vsock_list, protected by vhost_vsock_lock */ 37 struct list_head list; 38 39 struct vhost_work send_pkt_work; 40 spinlock_t send_pkt_list_lock; 41 struct list_head send_pkt_list; /* host->guest pending packets */ 42 43 atomic_t queued_replies; 44 45 u32 guest_cid; 46 }; 47 48 static u32 vhost_transport_get_local_cid(void) 49 { 50 return VHOST_VSOCK_DEFAULT_HOST_CID; 51 } 52 53 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 54 { 55 struct vhost_vsock *vsock; 56 57 spin_lock_bh(&vhost_vsock_lock); 58 list_for_each_entry(vsock, &vhost_vsock_list, list) { 59 u32 other_cid = vsock->guest_cid; 60 61 /* Skip instances that have no CID yet */ 62 if (other_cid == 0) 63 continue; 64 65 if (other_cid == guest_cid) { 66 spin_unlock_bh(&vhost_vsock_lock); 67 return vsock; 68 } 69 } 70 spin_unlock_bh(&vhost_vsock_lock); 71 72 return NULL; 73 } 74 75 static void 76 vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 77 struct vhost_virtqueue *vq) 78 { 79 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 80 bool added = false; 81 bool restart_tx = false; 82 83 mutex_lock(&vq->mutex); 84 85 if (!vq->private_data) 86 goto out; 87 88 /* Avoid further vmexits, we're already processing the virtqueue */ 89 vhost_disable_notify(&vsock->dev, vq); 90 91 for (;;) { 92 struct virtio_vsock_pkt *pkt; 93 struct iov_iter iov_iter; 94 unsigned out, in; 95 size_t nbytes; 96 size_t len; 97 int head; 98 99 spin_lock_bh(&vsock->send_pkt_list_lock); 100 if (list_empty(&vsock->send_pkt_list)) { 101 spin_unlock_bh(&vsock->send_pkt_list_lock); 102 vhost_enable_notify(&vsock->dev, vq); 103 break; 104 } 105 106 pkt = list_first_entry(&vsock->send_pkt_list, 107 struct virtio_vsock_pkt, list); 108 list_del_init(&pkt->list); 109 spin_unlock_bh(&vsock->send_pkt_list_lock); 110 111 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 112 &out, &in, NULL, NULL); 113 if (head < 0) { 114 spin_lock_bh(&vsock->send_pkt_list_lock); 115 list_add(&pkt->list, &vsock->send_pkt_list); 116 spin_unlock_bh(&vsock->send_pkt_list_lock); 117 break; 118 } 119 120 if (head == vq->num) { 121 spin_lock_bh(&vsock->send_pkt_list_lock); 122 list_add(&pkt->list, &vsock->send_pkt_list); 123 spin_unlock_bh(&vsock->send_pkt_list_lock); 124 125 /* We cannot finish yet if more buffers snuck in while 126 * re-enabling notify. 127 */ 128 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 129 vhost_disable_notify(&vsock->dev, vq); 130 continue; 131 } 132 break; 133 } 134 135 if (out) { 136 virtio_transport_free_pkt(pkt); 137 vq_err(vq, "Expected 0 output buffers, got %u\n", out); 138 break; 139 } 140 141 len = iov_length(&vq->iov[out], in); 142 iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len); 143 144 nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 145 if (nbytes != sizeof(pkt->hdr)) { 146 virtio_transport_free_pkt(pkt); 147 vq_err(vq, "Faulted on copying pkt hdr\n"); 148 break; 149 } 150 151 nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter); 152 if (nbytes != pkt->len) { 153 virtio_transport_free_pkt(pkt); 154 vq_err(vq, "Faulted on copying pkt buf\n"); 155 break; 156 } 157 158 vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); 159 added = true; 160 161 if (pkt->reply) { 162 int val; 163 164 val = atomic_dec_return(&vsock->queued_replies); 165 166 /* Do we have resources to resume tx processing? */ 167 if (val + 1 == tx_vq->num) 168 restart_tx = true; 169 } 170 171 virtio_transport_free_pkt(pkt); 172 } 173 if (added) 174 vhost_signal(&vsock->dev, vq); 175 176 out: 177 mutex_unlock(&vq->mutex); 178 179 if (restart_tx) 180 vhost_poll_queue(&tx_vq->poll); 181 } 182 183 static void vhost_transport_send_pkt_work(struct vhost_work *work) 184 { 185 struct vhost_virtqueue *vq; 186 struct vhost_vsock *vsock; 187 188 vsock = container_of(work, struct vhost_vsock, send_pkt_work); 189 vq = &vsock->vqs[VSOCK_VQ_RX]; 190 191 vhost_transport_do_send_pkt(vsock, vq); 192 } 193 194 static int 195 vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) 196 { 197 struct vhost_vsock *vsock; 198 int len = pkt->len; 199 200 /* Find the vhost_vsock according to guest context id */ 201 vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); 202 if (!vsock) { 203 virtio_transport_free_pkt(pkt); 204 return -ENODEV; 205 } 206 207 if (pkt->reply) 208 atomic_inc(&vsock->queued_replies); 209 210 spin_lock_bh(&vsock->send_pkt_list_lock); 211 list_add_tail(&pkt->list, &vsock->send_pkt_list); 212 spin_unlock_bh(&vsock->send_pkt_list_lock); 213 214 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 215 return len; 216 } 217 218 static struct virtio_vsock_pkt * 219 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 220 unsigned int out, unsigned int in) 221 { 222 struct virtio_vsock_pkt *pkt; 223 struct iov_iter iov_iter; 224 size_t nbytes; 225 size_t len; 226 227 if (in != 0) { 228 vq_err(vq, "Expected 0 input buffers, got %u\n", in); 229 return NULL; 230 } 231 232 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 233 if (!pkt) 234 return NULL; 235 236 len = iov_length(vq->iov, out); 237 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 238 239 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 240 if (nbytes != sizeof(pkt->hdr)) { 241 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 242 sizeof(pkt->hdr), nbytes); 243 kfree(pkt); 244 return NULL; 245 } 246 247 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 248 pkt->len = le32_to_cpu(pkt->hdr.len); 249 250 /* No payload */ 251 if (!pkt->len) 252 return pkt; 253 254 /* The pkt is too big */ 255 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 256 kfree(pkt); 257 return NULL; 258 } 259 260 pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 261 if (!pkt->buf) { 262 kfree(pkt); 263 return NULL; 264 } 265 266 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 267 if (nbytes != pkt->len) { 268 vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 269 pkt->len, nbytes); 270 virtio_transport_free_pkt(pkt); 271 return NULL; 272 } 273 274 return pkt; 275 } 276 277 /* Is there space left for replies to rx packets? */ 278 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 279 { 280 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 281 int val; 282 283 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 284 val = atomic_read(&vsock->queued_replies); 285 286 return val < vq->num; 287 } 288 289 static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 290 { 291 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 292 poll.work); 293 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 294 dev); 295 struct virtio_vsock_pkt *pkt; 296 int head; 297 unsigned int out, in; 298 bool added = false; 299 300 mutex_lock(&vq->mutex); 301 302 if (!vq->private_data) 303 goto out; 304 305 vhost_disable_notify(&vsock->dev, vq); 306 for (;;) { 307 u32 len; 308 309 if (!vhost_vsock_more_replies(vsock)) { 310 /* Stop tx until the device processes already 311 * pending replies. Leave tx virtqueue 312 * callbacks disabled. 313 */ 314 goto no_more_replies; 315 } 316 317 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 318 &out, &in, NULL, NULL); 319 if (head < 0) 320 break; 321 322 if (head == vq->num) { 323 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 324 vhost_disable_notify(&vsock->dev, vq); 325 continue; 326 } 327 break; 328 } 329 330 pkt = vhost_vsock_alloc_pkt(vq, out, in); 331 if (!pkt) { 332 vq_err(vq, "Faulted on pkt\n"); 333 continue; 334 } 335 336 len = pkt->len; 337 338 /* Only accept correctly addressed packets */ 339 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 340 virtio_transport_recv_pkt(pkt); 341 else 342 virtio_transport_free_pkt(pkt); 343 344 vhost_add_used(vq, head, sizeof(pkt->hdr) + len); 345 added = true; 346 } 347 348 no_more_replies: 349 if (added) 350 vhost_signal(&vsock->dev, vq); 351 352 out: 353 mutex_unlock(&vq->mutex); 354 } 355 356 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 357 { 358 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 359 poll.work); 360 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 361 dev); 362 363 vhost_transport_do_send_pkt(vsock, vq); 364 } 365 366 static int vhost_vsock_start(struct vhost_vsock *vsock) 367 { 368 size_t i; 369 int ret; 370 371 mutex_lock(&vsock->dev.mutex); 372 373 ret = vhost_dev_check_owner(&vsock->dev); 374 if (ret) 375 goto err; 376 377 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 378 struct vhost_virtqueue *vq = &vsock->vqs[i]; 379 380 mutex_lock(&vq->mutex); 381 382 if (!vhost_vq_access_ok(vq)) { 383 ret = -EFAULT; 384 mutex_unlock(&vq->mutex); 385 goto err_vq; 386 } 387 388 if (!vq->private_data) { 389 vq->private_data = vsock; 390 vhost_vq_init_access(vq); 391 } 392 393 mutex_unlock(&vq->mutex); 394 } 395 396 mutex_unlock(&vsock->dev.mutex); 397 return 0; 398 399 err_vq: 400 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 401 struct vhost_virtqueue *vq = &vsock->vqs[i]; 402 403 mutex_lock(&vq->mutex); 404 vq->private_data = NULL; 405 mutex_unlock(&vq->mutex); 406 } 407 err: 408 mutex_unlock(&vsock->dev.mutex); 409 return ret; 410 } 411 412 static int vhost_vsock_stop(struct vhost_vsock *vsock) 413 { 414 size_t i; 415 int ret; 416 417 mutex_lock(&vsock->dev.mutex); 418 419 ret = vhost_dev_check_owner(&vsock->dev); 420 if (ret) 421 goto err; 422 423 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 424 struct vhost_virtqueue *vq = &vsock->vqs[i]; 425 426 mutex_lock(&vq->mutex); 427 vq->private_data = NULL; 428 mutex_unlock(&vq->mutex); 429 } 430 431 err: 432 mutex_unlock(&vsock->dev.mutex); 433 return ret; 434 } 435 436 static void vhost_vsock_free(struct vhost_vsock *vsock) 437 { 438 kvfree(vsock); 439 } 440 441 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 442 { 443 struct vhost_virtqueue **vqs; 444 struct vhost_vsock *vsock; 445 int ret; 446 447 /* This struct is large and allocation could fail, fall back to vmalloc 448 * if there is no other way. 449 */ 450 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); 451 if (!vsock) { 452 vsock = vmalloc(sizeof(*vsock)); 453 if (!vsock) 454 return -ENOMEM; 455 } 456 457 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 458 if (!vqs) { 459 ret = -ENOMEM; 460 goto out; 461 } 462 463 atomic_set(&vsock->queued_replies, 0); 464 465 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 466 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 467 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 468 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 469 470 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs)); 471 472 file->private_data = vsock; 473 spin_lock_init(&vsock->send_pkt_list_lock); 474 INIT_LIST_HEAD(&vsock->send_pkt_list); 475 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 476 477 spin_lock_bh(&vhost_vsock_lock); 478 list_add_tail(&vsock->list, &vhost_vsock_list); 479 spin_unlock_bh(&vhost_vsock_lock); 480 return 0; 481 482 out: 483 vhost_vsock_free(vsock); 484 return ret; 485 } 486 487 static void vhost_vsock_flush(struct vhost_vsock *vsock) 488 { 489 int i; 490 491 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 492 if (vsock->vqs[i].handle_kick) 493 vhost_poll_flush(&vsock->vqs[i].poll); 494 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 495 } 496 497 static void vhost_vsock_reset_orphans(struct sock *sk) 498 { 499 struct vsock_sock *vsk = vsock_sk(sk); 500 501 /* vmci_transport.c doesn't take sk_lock here either. At least we're 502 * under vsock_table_lock so the sock cannot disappear while we're 503 * executing. 504 */ 505 506 if (!vhost_vsock_get(vsk->local_addr.svm_cid)) { 507 sock_set_flag(sk, SOCK_DONE); 508 vsk->peer_shutdown = SHUTDOWN_MASK; 509 sk->sk_state = SS_UNCONNECTED; 510 sk->sk_err = ECONNRESET; 511 sk->sk_error_report(sk); 512 } 513 } 514 515 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 516 { 517 struct vhost_vsock *vsock = file->private_data; 518 519 spin_lock_bh(&vhost_vsock_lock); 520 list_del(&vsock->list); 521 spin_unlock_bh(&vhost_vsock_lock); 522 523 /* Iterating over all connections for all CIDs to find orphans is 524 * inefficient. Room for improvement here. */ 525 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 526 527 vhost_vsock_stop(vsock); 528 vhost_vsock_flush(vsock); 529 vhost_dev_stop(&vsock->dev); 530 531 spin_lock_bh(&vsock->send_pkt_list_lock); 532 while (!list_empty(&vsock->send_pkt_list)) { 533 struct virtio_vsock_pkt *pkt; 534 535 pkt = list_first_entry(&vsock->send_pkt_list, 536 struct virtio_vsock_pkt, list); 537 list_del_init(&pkt->list); 538 virtio_transport_free_pkt(pkt); 539 } 540 spin_unlock_bh(&vsock->send_pkt_list_lock); 541 542 vhost_dev_cleanup(&vsock->dev, false); 543 kfree(vsock->dev.vqs); 544 vhost_vsock_free(vsock); 545 return 0; 546 } 547 548 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 549 { 550 struct vhost_vsock *other; 551 552 /* Refuse reserved CIDs */ 553 if (guest_cid <= VMADDR_CID_HOST || 554 guest_cid == U32_MAX) 555 return -EINVAL; 556 557 /* 64-bit CIDs are not yet supported */ 558 if (guest_cid > U32_MAX) 559 return -EINVAL; 560 561 /* Refuse if CID is already in use */ 562 other = vhost_vsock_get(guest_cid); 563 if (other && other != vsock) 564 return -EADDRINUSE; 565 566 spin_lock_bh(&vhost_vsock_lock); 567 vsock->guest_cid = guest_cid; 568 spin_unlock_bh(&vhost_vsock_lock); 569 570 return 0; 571 } 572 573 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 574 { 575 struct vhost_virtqueue *vq; 576 int i; 577 578 if (features & ~VHOST_VSOCK_FEATURES) 579 return -EOPNOTSUPP; 580 581 mutex_lock(&vsock->dev.mutex); 582 if ((features & (1 << VHOST_F_LOG_ALL)) && 583 !vhost_log_access_ok(&vsock->dev)) { 584 mutex_unlock(&vsock->dev.mutex); 585 return -EFAULT; 586 } 587 588 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 589 vq = &vsock->vqs[i]; 590 mutex_lock(&vq->mutex); 591 vq->acked_features = features; 592 mutex_unlock(&vq->mutex); 593 } 594 mutex_unlock(&vsock->dev.mutex); 595 return 0; 596 } 597 598 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 599 unsigned long arg) 600 { 601 struct vhost_vsock *vsock = f->private_data; 602 void __user *argp = (void __user *)arg; 603 u64 guest_cid; 604 u64 features; 605 int start; 606 int r; 607 608 switch (ioctl) { 609 case VHOST_VSOCK_SET_GUEST_CID: 610 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 611 return -EFAULT; 612 return vhost_vsock_set_cid(vsock, guest_cid); 613 case VHOST_VSOCK_SET_RUNNING: 614 if (copy_from_user(&start, argp, sizeof(start))) 615 return -EFAULT; 616 if (start) 617 return vhost_vsock_start(vsock); 618 else 619 return vhost_vsock_stop(vsock); 620 case VHOST_GET_FEATURES: 621 features = VHOST_VSOCK_FEATURES; 622 if (copy_to_user(argp, &features, sizeof(features))) 623 return -EFAULT; 624 return 0; 625 case VHOST_SET_FEATURES: 626 if (copy_from_user(&features, argp, sizeof(features))) 627 return -EFAULT; 628 return vhost_vsock_set_features(vsock, features); 629 default: 630 mutex_lock(&vsock->dev.mutex); 631 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 632 if (r == -ENOIOCTLCMD) 633 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 634 else 635 vhost_vsock_flush(vsock); 636 mutex_unlock(&vsock->dev.mutex); 637 return r; 638 } 639 } 640 641 static const struct file_operations vhost_vsock_fops = { 642 .owner = THIS_MODULE, 643 .open = vhost_vsock_dev_open, 644 .release = vhost_vsock_dev_release, 645 .llseek = noop_llseek, 646 .unlocked_ioctl = vhost_vsock_dev_ioctl, 647 }; 648 649 static struct miscdevice vhost_vsock_misc = { 650 .minor = MISC_DYNAMIC_MINOR, 651 .name = "vhost-vsock", 652 .fops = &vhost_vsock_fops, 653 }; 654 655 static struct virtio_transport vhost_transport = { 656 .transport = { 657 .get_local_cid = vhost_transport_get_local_cid, 658 659 .init = virtio_transport_do_socket_init, 660 .destruct = virtio_transport_destruct, 661 .release = virtio_transport_release, 662 .connect = virtio_transport_connect, 663 .shutdown = virtio_transport_shutdown, 664 665 .dgram_enqueue = virtio_transport_dgram_enqueue, 666 .dgram_dequeue = virtio_transport_dgram_dequeue, 667 .dgram_bind = virtio_transport_dgram_bind, 668 .dgram_allow = virtio_transport_dgram_allow, 669 670 .stream_enqueue = virtio_transport_stream_enqueue, 671 .stream_dequeue = virtio_transport_stream_dequeue, 672 .stream_has_data = virtio_transport_stream_has_data, 673 .stream_has_space = virtio_transport_stream_has_space, 674 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 675 .stream_is_active = virtio_transport_stream_is_active, 676 .stream_allow = virtio_transport_stream_allow, 677 678 .notify_poll_in = virtio_transport_notify_poll_in, 679 .notify_poll_out = virtio_transport_notify_poll_out, 680 .notify_recv_init = virtio_transport_notify_recv_init, 681 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 682 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 683 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 684 .notify_send_init = virtio_transport_notify_send_init, 685 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 686 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 687 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 688 689 .set_buffer_size = virtio_transport_set_buffer_size, 690 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 691 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 692 .get_buffer_size = virtio_transport_get_buffer_size, 693 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 694 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 695 }, 696 697 .send_pkt = vhost_transport_send_pkt, 698 }; 699 700 static int __init vhost_vsock_init(void) 701 { 702 int ret; 703 704 ret = vsock_core_init(&vhost_transport.transport); 705 if (ret < 0) 706 return ret; 707 return misc_register(&vhost_vsock_misc); 708 }; 709 710 static void __exit vhost_vsock_exit(void) 711 { 712 misc_deregister(&vhost_vsock_misc); 713 vsock_core_exit(); 714 }; 715 716 module_init(vhost_vsock_init); 717 module_exit(vhost_vsock_exit); 718 MODULE_LICENSE("GPL v2"); 719 MODULE_AUTHOR("Asias He"); 720 MODULE_DESCRIPTION("vhost transport for vsock "); 721