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 struct vhost_virtqueue *vq; 199 int len = pkt->len; 200 201 /* Find the vhost_vsock according to guest context id */ 202 vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); 203 if (!vsock) { 204 virtio_transport_free_pkt(pkt); 205 return -ENODEV; 206 } 207 208 vq = &vsock->vqs[VSOCK_VQ_RX]; 209 210 if (pkt->reply) 211 atomic_inc(&vsock->queued_replies); 212 213 spin_lock_bh(&vsock->send_pkt_list_lock); 214 list_add_tail(&pkt->list, &vsock->send_pkt_list); 215 spin_unlock_bh(&vsock->send_pkt_list_lock); 216 217 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 218 return len; 219 } 220 221 static struct virtio_vsock_pkt * 222 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 223 unsigned int out, unsigned int in) 224 { 225 struct virtio_vsock_pkt *pkt; 226 struct iov_iter iov_iter; 227 size_t nbytes; 228 size_t len; 229 230 if (in != 0) { 231 vq_err(vq, "Expected 0 input buffers, got %u\n", in); 232 return NULL; 233 } 234 235 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 236 if (!pkt) 237 return NULL; 238 239 len = iov_length(vq->iov, out); 240 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 241 242 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 243 if (nbytes != sizeof(pkt->hdr)) { 244 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 245 sizeof(pkt->hdr), nbytes); 246 kfree(pkt); 247 return NULL; 248 } 249 250 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 251 pkt->len = le32_to_cpu(pkt->hdr.len); 252 253 /* No payload */ 254 if (!pkt->len) 255 return pkt; 256 257 /* The pkt is too big */ 258 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 259 kfree(pkt); 260 return NULL; 261 } 262 263 pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 264 if (!pkt->buf) { 265 kfree(pkt); 266 return NULL; 267 } 268 269 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 270 if (nbytes != pkt->len) { 271 vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 272 pkt->len, nbytes); 273 virtio_transport_free_pkt(pkt); 274 return NULL; 275 } 276 277 return pkt; 278 } 279 280 /* Is there space left for replies to rx packets? */ 281 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 282 { 283 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 284 int val; 285 286 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 287 val = atomic_read(&vsock->queued_replies); 288 289 return val < vq->num; 290 } 291 292 static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 293 { 294 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 295 poll.work); 296 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 297 dev); 298 struct virtio_vsock_pkt *pkt; 299 int head; 300 unsigned int out, in; 301 bool added = false; 302 303 mutex_lock(&vq->mutex); 304 305 if (!vq->private_data) 306 goto out; 307 308 vhost_disable_notify(&vsock->dev, vq); 309 for (;;) { 310 if (!vhost_vsock_more_replies(vsock)) { 311 /* Stop tx until the device processes already 312 * pending replies. Leave tx virtqueue 313 * callbacks disabled. 314 */ 315 goto no_more_replies; 316 } 317 318 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 319 &out, &in, NULL, NULL); 320 if (head < 0) 321 break; 322 323 if (head == vq->num) { 324 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 325 vhost_disable_notify(&vsock->dev, vq); 326 continue; 327 } 328 break; 329 } 330 331 pkt = vhost_vsock_alloc_pkt(vq, out, in); 332 if (!pkt) { 333 vq_err(vq, "Faulted on pkt\n"); 334 continue; 335 } 336 337 /* Only accept correctly addressed packets */ 338 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 339 virtio_transport_recv_pkt(pkt); 340 else 341 virtio_transport_free_pkt(pkt); 342 343 vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); 344 added = true; 345 } 346 347 no_more_replies: 348 if (added) 349 vhost_signal(&vsock->dev, vq); 350 351 out: 352 mutex_unlock(&vq->mutex); 353 } 354 355 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 356 { 357 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 358 poll.work); 359 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 360 dev); 361 362 vhost_transport_do_send_pkt(vsock, vq); 363 } 364 365 static int vhost_vsock_start(struct vhost_vsock *vsock) 366 { 367 size_t i; 368 int ret; 369 370 mutex_lock(&vsock->dev.mutex); 371 372 ret = vhost_dev_check_owner(&vsock->dev); 373 if (ret) 374 goto err; 375 376 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 377 struct vhost_virtqueue *vq = &vsock->vqs[i]; 378 379 mutex_lock(&vq->mutex); 380 381 if (!vhost_vq_access_ok(vq)) { 382 ret = -EFAULT; 383 mutex_unlock(&vq->mutex); 384 goto err_vq; 385 } 386 387 if (!vq->private_data) { 388 vq->private_data = vsock; 389 vhost_vq_init_access(vq); 390 } 391 392 mutex_unlock(&vq->mutex); 393 } 394 395 mutex_unlock(&vsock->dev.mutex); 396 return 0; 397 398 err_vq: 399 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 400 struct vhost_virtqueue *vq = &vsock->vqs[i]; 401 402 mutex_lock(&vq->mutex); 403 vq->private_data = NULL; 404 mutex_unlock(&vq->mutex); 405 } 406 err: 407 mutex_unlock(&vsock->dev.mutex); 408 return ret; 409 } 410 411 static int vhost_vsock_stop(struct vhost_vsock *vsock) 412 { 413 size_t i; 414 int ret; 415 416 mutex_lock(&vsock->dev.mutex); 417 418 ret = vhost_dev_check_owner(&vsock->dev); 419 if (ret) 420 goto err; 421 422 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 423 struct vhost_virtqueue *vq = &vsock->vqs[i]; 424 425 mutex_lock(&vq->mutex); 426 vq->private_data = NULL; 427 mutex_unlock(&vq->mutex); 428 } 429 430 err: 431 mutex_unlock(&vsock->dev.mutex); 432 return ret; 433 } 434 435 static void vhost_vsock_free(struct vhost_vsock *vsock) 436 { 437 kvfree(vsock); 438 } 439 440 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 441 { 442 struct vhost_virtqueue **vqs; 443 struct vhost_vsock *vsock; 444 int ret; 445 446 /* This struct is large and allocation could fail, fall back to vmalloc 447 * if there is no other way. 448 */ 449 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); 450 if (!vsock) { 451 vsock = vmalloc(sizeof(*vsock)); 452 if (!vsock) 453 return -ENOMEM; 454 } 455 456 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 457 if (!vqs) { 458 ret = -ENOMEM; 459 goto out; 460 } 461 462 atomic_set(&vsock->queued_replies, 0); 463 464 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 465 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 466 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 467 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 468 469 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs)); 470 471 file->private_data = vsock; 472 spin_lock_init(&vsock->send_pkt_list_lock); 473 INIT_LIST_HEAD(&vsock->send_pkt_list); 474 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 475 476 spin_lock_bh(&vhost_vsock_lock); 477 list_add_tail(&vsock->list, &vhost_vsock_list); 478 spin_unlock_bh(&vhost_vsock_lock); 479 return 0; 480 481 out: 482 vhost_vsock_free(vsock); 483 return ret; 484 } 485 486 static void vhost_vsock_flush(struct vhost_vsock *vsock) 487 { 488 int i; 489 490 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 491 if (vsock->vqs[i].handle_kick) 492 vhost_poll_flush(&vsock->vqs[i].poll); 493 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 494 } 495 496 static void vhost_vsock_reset_orphans(struct sock *sk) 497 { 498 struct vsock_sock *vsk = vsock_sk(sk); 499 500 /* vmci_transport.c doesn't take sk_lock here either. At least we're 501 * under vsock_table_lock so the sock cannot disappear while we're 502 * executing. 503 */ 504 505 if (!vhost_vsock_get(vsk->local_addr.svm_cid)) { 506 sock_set_flag(sk, SOCK_DONE); 507 vsk->peer_shutdown = SHUTDOWN_MASK; 508 sk->sk_state = SS_UNCONNECTED; 509 sk->sk_err = ECONNRESET; 510 sk->sk_error_report(sk); 511 } 512 } 513 514 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 515 { 516 struct vhost_vsock *vsock = file->private_data; 517 518 spin_lock_bh(&vhost_vsock_lock); 519 list_del(&vsock->list); 520 spin_unlock_bh(&vhost_vsock_lock); 521 522 /* Iterating over all connections for all CIDs to find orphans is 523 * inefficient. Room for improvement here. */ 524 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 525 526 vhost_vsock_stop(vsock); 527 vhost_vsock_flush(vsock); 528 vhost_dev_stop(&vsock->dev); 529 530 spin_lock_bh(&vsock->send_pkt_list_lock); 531 while (!list_empty(&vsock->send_pkt_list)) { 532 struct virtio_vsock_pkt *pkt; 533 534 pkt = list_first_entry(&vsock->send_pkt_list, 535 struct virtio_vsock_pkt, list); 536 list_del_init(&pkt->list); 537 virtio_transport_free_pkt(pkt); 538 } 539 spin_unlock_bh(&vsock->send_pkt_list_lock); 540 541 vhost_dev_cleanup(&vsock->dev, false); 542 kfree(vsock->dev.vqs); 543 vhost_vsock_free(vsock); 544 return 0; 545 } 546 547 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 548 { 549 struct vhost_vsock *other; 550 551 /* Refuse reserved CIDs */ 552 if (guest_cid <= VMADDR_CID_HOST || 553 guest_cid == U32_MAX) 554 return -EINVAL; 555 556 /* 64-bit CIDs are not yet supported */ 557 if (guest_cid > U32_MAX) 558 return -EINVAL; 559 560 /* Refuse if CID is already in use */ 561 other = vhost_vsock_get(guest_cid); 562 if (other && other != vsock) 563 return -EADDRINUSE; 564 565 spin_lock_bh(&vhost_vsock_lock); 566 vsock->guest_cid = guest_cid; 567 spin_unlock_bh(&vhost_vsock_lock); 568 569 return 0; 570 } 571 572 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 573 { 574 struct vhost_virtqueue *vq; 575 int i; 576 577 if (features & ~VHOST_VSOCK_FEATURES) 578 return -EOPNOTSUPP; 579 580 mutex_lock(&vsock->dev.mutex); 581 if ((features & (1 << VHOST_F_LOG_ALL)) && 582 !vhost_log_access_ok(&vsock->dev)) { 583 mutex_unlock(&vsock->dev.mutex); 584 return -EFAULT; 585 } 586 587 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 588 vq = &vsock->vqs[i]; 589 mutex_lock(&vq->mutex); 590 vq->acked_features = features; 591 mutex_unlock(&vq->mutex); 592 } 593 mutex_unlock(&vsock->dev.mutex); 594 return 0; 595 } 596 597 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 598 unsigned long arg) 599 { 600 struct vhost_vsock *vsock = f->private_data; 601 void __user *argp = (void __user *)arg; 602 u64 guest_cid; 603 u64 features; 604 int start; 605 int r; 606 607 switch (ioctl) { 608 case VHOST_VSOCK_SET_GUEST_CID: 609 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 610 return -EFAULT; 611 return vhost_vsock_set_cid(vsock, guest_cid); 612 case VHOST_VSOCK_SET_RUNNING: 613 if (copy_from_user(&start, argp, sizeof(start))) 614 return -EFAULT; 615 if (start) 616 return vhost_vsock_start(vsock); 617 else 618 return vhost_vsock_stop(vsock); 619 case VHOST_GET_FEATURES: 620 features = VHOST_VSOCK_FEATURES; 621 if (copy_to_user(argp, &features, sizeof(features))) 622 return -EFAULT; 623 return 0; 624 case VHOST_SET_FEATURES: 625 if (copy_from_user(&features, argp, sizeof(features))) 626 return -EFAULT; 627 return vhost_vsock_set_features(vsock, features); 628 default: 629 mutex_lock(&vsock->dev.mutex); 630 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 631 if (r == -ENOIOCTLCMD) 632 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 633 else 634 vhost_vsock_flush(vsock); 635 mutex_unlock(&vsock->dev.mutex); 636 return r; 637 } 638 } 639 640 static const struct file_operations vhost_vsock_fops = { 641 .owner = THIS_MODULE, 642 .open = vhost_vsock_dev_open, 643 .release = vhost_vsock_dev_release, 644 .llseek = noop_llseek, 645 .unlocked_ioctl = vhost_vsock_dev_ioctl, 646 }; 647 648 static struct miscdevice vhost_vsock_misc = { 649 .minor = MISC_DYNAMIC_MINOR, 650 .name = "vhost-vsock", 651 .fops = &vhost_vsock_fops, 652 }; 653 654 static struct virtio_transport vhost_transport = { 655 .transport = { 656 .get_local_cid = vhost_transport_get_local_cid, 657 658 .init = virtio_transport_do_socket_init, 659 .destruct = virtio_transport_destruct, 660 .release = virtio_transport_release, 661 .connect = virtio_transport_connect, 662 .shutdown = virtio_transport_shutdown, 663 664 .dgram_enqueue = virtio_transport_dgram_enqueue, 665 .dgram_dequeue = virtio_transport_dgram_dequeue, 666 .dgram_bind = virtio_transport_dgram_bind, 667 .dgram_allow = virtio_transport_dgram_allow, 668 669 .stream_enqueue = virtio_transport_stream_enqueue, 670 .stream_dequeue = virtio_transport_stream_dequeue, 671 .stream_has_data = virtio_transport_stream_has_data, 672 .stream_has_space = virtio_transport_stream_has_space, 673 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 674 .stream_is_active = virtio_transport_stream_is_active, 675 .stream_allow = virtio_transport_stream_allow, 676 677 .notify_poll_in = virtio_transport_notify_poll_in, 678 .notify_poll_out = virtio_transport_notify_poll_out, 679 .notify_recv_init = virtio_transport_notify_recv_init, 680 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 681 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 682 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 683 .notify_send_init = virtio_transport_notify_send_init, 684 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 685 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 686 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 687 688 .set_buffer_size = virtio_transport_set_buffer_size, 689 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 690 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 691 .get_buffer_size = virtio_transport_get_buffer_size, 692 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 693 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 694 }, 695 696 .send_pkt = vhost_transport_send_pkt, 697 }; 698 699 static int __init vhost_vsock_init(void) 700 { 701 int ret; 702 703 ret = vsock_core_init(&vhost_transport.transport); 704 if (ret < 0) 705 return ret; 706 return misc_register(&vhost_vsock_misc); 707 }; 708 709 static void __exit vhost_vsock_exit(void) 710 { 711 misc_deregister(&vhost_vsock_misc); 712 vsock_core_exit(); 713 }; 714 715 module_init(vhost_vsock_init); 716 module_exit(vhost_vsock_exit); 717 MODULE_LICENSE("GPL v2"); 718 MODULE_AUTHOR("Asias He"); 719 MODULE_DESCRIPTION("vhost transport for vsock "); 720