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 list_for_each_entry(vsock, &vhost_vsock_list, list) { 58 u32 other_cid = vsock->guest_cid; 59 60 /* Skip instances that have no CID yet */ 61 if (other_cid == 0) 62 continue; 63 64 if (other_cid == guest_cid) { 65 return vsock; 66 } 67 } 68 69 return NULL; 70 } 71 72 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 73 { 74 struct vhost_vsock *vsock; 75 76 spin_lock_bh(&vhost_vsock_lock); 77 vsock = __vhost_vsock_get(guest_cid); 78 spin_unlock_bh(&vhost_vsock_lock); 79 80 return vsock; 81 } 82 83 static void 84 vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 85 struct vhost_virtqueue *vq) 86 { 87 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 88 bool added = false; 89 bool restart_tx = false; 90 91 mutex_lock(&vq->mutex); 92 93 if (!vq->private_data) 94 goto out; 95 96 /* Avoid further vmexits, we're already processing the virtqueue */ 97 vhost_disable_notify(&vsock->dev, vq); 98 99 for (;;) { 100 struct virtio_vsock_pkt *pkt; 101 struct iov_iter iov_iter; 102 unsigned out, in; 103 size_t nbytes; 104 size_t len; 105 int head; 106 107 spin_lock_bh(&vsock->send_pkt_list_lock); 108 if (list_empty(&vsock->send_pkt_list)) { 109 spin_unlock_bh(&vsock->send_pkt_list_lock); 110 vhost_enable_notify(&vsock->dev, vq); 111 break; 112 } 113 114 pkt = list_first_entry(&vsock->send_pkt_list, 115 struct virtio_vsock_pkt, list); 116 list_del_init(&pkt->list); 117 spin_unlock_bh(&vsock->send_pkt_list_lock); 118 119 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 120 &out, &in, NULL, NULL); 121 if (head < 0) { 122 spin_lock_bh(&vsock->send_pkt_list_lock); 123 list_add(&pkt->list, &vsock->send_pkt_list); 124 spin_unlock_bh(&vsock->send_pkt_list_lock); 125 break; 126 } 127 128 if (head == vq->num) { 129 spin_lock_bh(&vsock->send_pkt_list_lock); 130 list_add(&pkt->list, &vsock->send_pkt_list); 131 spin_unlock_bh(&vsock->send_pkt_list_lock); 132 133 /* We cannot finish yet if more buffers snuck in while 134 * re-enabling notify. 135 */ 136 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 137 vhost_disable_notify(&vsock->dev, vq); 138 continue; 139 } 140 break; 141 } 142 143 if (out) { 144 virtio_transport_free_pkt(pkt); 145 vq_err(vq, "Expected 0 output buffers, got %u\n", out); 146 break; 147 } 148 149 len = iov_length(&vq->iov[out], in); 150 iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len); 151 152 nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 153 if (nbytes != sizeof(pkt->hdr)) { 154 virtio_transport_free_pkt(pkt); 155 vq_err(vq, "Faulted on copying pkt hdr\n"); 156 break; 157 } 158 159 nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter); 160 if (nbytes != pkt->len) { 161 virtio_transport_free_pkt(pkt); 162 vq_err(vq, "Faulted on copying pkt buf\n"); 163 break; 164 } 165 166 vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); 167 added = true; 168 169 if (pkt->reply) { 170 int val; 171 172 val = atomic_dec_return(&vsock->queued_replies); 173 174 /* Do we have resources to resume tx processing? */ 175 if (val + 1 == tx_vq->num) 176 restart_tx = true; 177 } 178 179 virtio_transport_free_pkt(pkt); 180 } 181 if (added) 182 vhost_signal(&vsock->dev, vq); 183 184 out: 185 mutex_unlock(&vq->mutex); 186 187 if (restart_tx) 188 vhost_poll_queue(&tx_vq->poll); 189 } 190 191 static void vhost_transport_send_pkt_work(struct vhost_work *work) 192 { 193 struct vhost_virtqueue *vq; 194 struct vhost_vsock *vsock; 195 196 vsock = container_of(work, struct vhost_vsock, send_pkt_work); 197 vq = &vsock->vqs[VSOCK_VQ_RX]; 198 199 vhost_transport_do_send_pkt(vsock, vq); 200 } 201 202 static int 203 vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) 204 { 205 struct vhost_vsock *vsock; 206 int len = pkt->len; 207 208 /* Find the vhost_vsock according to guest context id */ 209 vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); 210 if (!vsock) { 211 virtio_transport_free_pkt(pkt); 212 return -ENODEV; 213 } 214 215 if (pkt->reply) 216 atomic_inc(&vsock->queued_replies); 217 218 spin_lock_bh(&vsock->send_pkt_list_lock); 219 list_add_tail(&pkt->list, &vsock->send_pkt_list); 220 spin_unlock_bh(&vsock->send_pkt_list_lock); 221 222 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 223 return len; 224 } 225 226 static struct virtio_vsock_pkt * 227 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 228 unsigned int out, unsigned int in) 229 { 230 struct virtio_vsock_pkt *pkt; 231 struct iov_iter iov_iter; 232 size_t nbytes; 233 size_t len; 234 235 if (in != 0) { 236 vq_err(vq, "Expected 0 input buffers, got %u\n", in); 237 return NULL; 238 } 239 240 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 241 if (!pkt) 242 return NULL; 243 244 len = iov_length(vq->iov, out); 245 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 246 247 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 248 if (nbytes != sizeof(pkt->hdr)) { 249 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 250 sizeof(pkt->hdr), nbytes); 251 kfree(pkt); 252 return NULL; 253 } 254 255 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 256 pkt->len = le32_to_cpu(pkt->hdr.len); 257 258 /* No payload */ 259 if (!pkt->len) 260 return pkt; 261 262 /* The pkt is too big */ 263 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 264 kfree(pkt); 265 return NULL; 266 } 267 268 pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 269 if (!pkt->buf) { 270 kfree(pkt); 271 return NULL; 272 } 273 274 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 275 if (nbytes != pkt->len) { 276 vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 277 pkt->len, nbytes); 278 virtio_transport_free_pkt(pkt); 279 return NULL; 280 } 281 282 return pkt; 283 } 284 285 /* Is there space left for replies to rx packets? */ 286 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 287 { 288 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 289 int val; 290 291 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 292 val = atomic_read(&vsock->queued_replies); 293 294 return val < vq->num; 295 } 296 297 static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 298 { 299 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 300 poll.work); 301 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 302 dev); 303 struct virtio_vsock_pkt *pkt; 304 int head; 305 unsigned int out, in; 306 bool added = false; 307 308 mutex_lock(&vq->mutex); 309 310 if (!vq->private_data) 311 goto out; 312 313 vhost_disable_notify(&vsock->dev, vq); 314 for (;;) { 315 u32 len; 316 317 if (!vhost_vsock_more_replies(vsock)) { 318 /* Stop tx until the device processes already 319 * pending replies. Leave tx virtqueue 320 * callbacks disabled. 321 */ 322 goto no_more_replies; 323 } 324 325 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 326 &out, &in, NULL, NULL); 327 if (head < 0) 328 break; 329 330 if (head == vq->num) { 331 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 332 vhost_disable_notify(&vsock->dev, vq); 333 continue; 334 } 335 break; 336 } 337 338 pkt = vhost_vsock_alloc_pkt(vq, out, in); 339 if (!pkt) { 340 vq_err(vq, "Faulted on pkt\n"); 341 continue; 342 } 343 344 len = pkt->len; 345 346 /* Only accept correctly addressed packets */ 347 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 348 virtio_transport_recv_pkt(pkt); 349 else 350 virtio_transport_free_pkt(pkt); 351 352 vhost_add_used(vq, head, sizeof(pkt->hdr) + len); 353 added = true; 354 } 355 356 no_more_replies: 357 if (added) 358 vhost_signal(&vsock->dev, vq); 359 360 out: 361 mutex_unlock(&vq->mutex); 362 } 363 364 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 365 { 366 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 367 poll.work); 368 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 369 dev); 370 371 vhost_transport_do_send_pkt(vsock, vq); 372 } 373 374 static int vhost_vsock_start(struct vhost_vsock *vsock) 375 { 376 size_t i; 377 int ret; 378 379 mutex_lock(&vsock->dev.mutex); 380 381 ret = vhost_dev_check_owner(&vsock->dev); 382 if (ret) 383 goto err; 384 385 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 386 struct vhost_virtqueue *vq = &vsock->vqs[i]; 387 388 mutex_lock(&vq->mutex); 389 390 if (!vhost_vq_access_ok(vq)) { 391 ret = -EFAULT; 392 mutex_unlock(&vq->mutex); 393 goto err_vq; 394 } 395 396 if (!vq->private_data) { 397 vq->private_data = vsock; 398 vhost_vq_init_access(vq); 399 } 400 401 mutex_unlock(&vq->mutex); 402 } 403 404 mutex_unlock(&vsock->dev.mutex); 405 return 0; 406 407 err_vq: 408 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 409 struct vhost_virtqueue *vq = &vsock->vqs[i]; 410 411 mutex_lock(&vq->mutex); 412 vq->private_data = NULL; 413 mutex_unlock(&vq->mutex); 414 } 415 err: 416 mutex_unlock(&vsock->dev.mutex); 417 return ret; 418 } 419 420 static int vhost_vsock_stop(struct vhost_vsock *vsock) 421 { 422 size_t i; 423 int ret; 424 425 mutex_lock(&vsock->dev.mutex); 426 427 ret = vhost_dev_check_owner(&vsock->dev); 428 if (ret) 429 goto err; 430 431 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 432 struct vhost_virtqueue *vq = &vsock->vqs[i]; 433 434 mutex_lock(&vq->mutex); 435 vq->private_data = NULL; 436 mutex_unlock(&vq->mutex); 437 } 438 439 err: 440 mutex_unlock(&vsock->dev.mutex); 441 return ret; 442 } 443 444 static void vhost_vsock_free(struct vhost_vsock *vsock) 445 { 446 kvfree(vsock); 447 } 448 449 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 450 { 451 struct vhost_virtqueue **vqs; 452 struct vhost_vsock *vsock; 453 int ret; 454 455 /* This struct is large and allocation could fail, fall back to vmalloc 456 * if there is no other way. 457 */ 458 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); 459 if (!vsock) { 460 vsock = vmalloc(sizeof(*vsock)); 461 if (!vsock) 462 return -ENOMEM; 463 } 464 465 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 466 if (!vqs) { 467 ret = -ENOMEM; 468 goto out; 469 } 470 471 atomic_set(&vsock->queued_replies, 0); 472 473 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 474 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 475 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 476 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 477 478 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs)); 479 480 file->private_data = vsock; 481 spin_lock_init(&vsock->send_pkt_list_lock); 482 INIT_LIST_HEAD(&vsock->send_pkt_list); 483 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 484 485 spin_lock_bh(&vhost_vsock_lock); 486 list_add_tail(&vsock->list, &vhost_vsock_list); 487 spin_unlock_bh(&vhost_vsock_lock); 488 return 0; 489 490 out: 491 vhost_vsock_free(vsock); 492 return ret; 493 } 494 495 static void vhost_vsock_flush(struct vhost_vsock *vsock) 496 { 497 int i; 498 499 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 500 if (vsock->vqs[i].handle_kick) 501 vhost_poll_flush(&vsock->vqs[i].poll); 502 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 503 } 504 505 static void vhost_vsock_reset_orphans(struct sock *sk) 506 { 507 struct vsock_sock *vsk = vsock_sk(sk); 508 509 /* vmci_transport.c doesn't take sk_lock here either. At least we're 510 * under vsock_table_lock so the sock cannot disappear while we're 511 * executing. 512 */ 513 514 if (!vhost_vsock_get(vsk->remote_addr.svm_cid)) { 515 sock_set_flag(sk, SOCK_DONE); 516 vsk->peer_shutdown = SHUTDOWN_MASK; 517 sk->sk_state = SS_UNCONNECTED; 518 sk->sk_err = ECONNRESET; 519 sk->sk_error_report(sk); 520 } 521 } 522 523 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 524 { 525 struct vhost_vsock *vsock = file->private_data; 526 527 spin_lock_bh(&vhost_vsock_lock); 528 list_del(&vsock->list); 529 spin_unlock_bh(&vhost_vsock_lock); 530 531 /* Iterating over all connections for all CIDs to find orphans is 532 * inefficient. Room for improvement here. */ 533 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 534 535 vhost_vsock_stop(vsock); 536 vhost_vsock_flush(vsock); 537 vhost_dev_stop(&vsock->dev); 538 539 spin_lock_bh(&vsock->send_pkt_list_lock); 540 while (!list_empty(&vsock->send_pkt_list)) { 541 struct virtio_vsock_pkt *pkt; 542 543 pkt = list_first_entry(&vsock->send_pkt_list, 544 struct virtio_vsock_pkt, list); 545 list_del_init(&pkt->list); 546 virtio_transport_free_pkt(pkt); 547 } 548 spin_unlock_bh(&vsock->send_pkt_list_lock); 549 550 vhost_dev_cleanup(&vsock->dev, false); 551 kfree(vsock->dev.vqs); 552 vhost_vsock_free(vsock); 553 return 0; 554 } 555 556 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 557 { 558 struct vhost_vsock *other; 559 560 /* Refuse reserved CIDs */ 561 if (guest_cid <= VMADDR_CID_HOST || 562 guest_cid == U32_MAX) 563 return -EINVAL; 564 565 /* 64-bit CIDs are not yet supported */ 566 if (guest_cid > U32_MAX) 567 return -EINVAL; 568 569 /* Refuse if CID is already in use */ 570 spin_lock_bh(&vhost_vsock_lock); 571 other = __vhost_vsock_get(guest_cid); 572 if (other && other != vsock) { 573 spin_unlock_bh(&vhost_vsock_lock); 574 return -EADDRINUSE; 575 } 576 vsock->guest_cid = guest_cid; 577 spin_unlock_bh(&vhost_vsock_lock); 578 579 return 0; 580 } 581 582 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 583 { 584 struct vhost_virtqueue *vq; 585 int i; 586 587 if (features & ~VHOST_VSOCK_FEATURES) 588 return -EOPNOTSUPP; 589 590 mutex_lock(&vsock->dev.mutex); 591 if ((features & (1 << VHOST_F_LOG_ALL)) && 592 !vhost_log_access_ok(&vsock->dev)) { 593 mutex_unlock(&vsock->dev.mutex); 594 return -EFAULT; 595 } 596 597 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 598 vq = &vsock->vqs[i]; 599 mutex_lock(&vq->mutex); 600 vq->acked_features = features; 601 mutex_unlock(&vq->mutex); 602 } 603 mutex_unlock(&vsock->dev.mutex); 604 return 0; 605 } 606 607 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 608 unsigned long arg) 609 { 610 struct vhost_vsock *vsock = f->private_data; 611 void __user *argp = (void __user *)arg; 612 u64 guest_cid; 613 u64 features; 614 int start; 615 int r; 616 617 switch (ioctl) { 618 case VHOST_VSOCK_SET_GUEST_CID: 619 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 620 return -EFAULT; 621 return vhost_vsock_set_cid(vsock, guest_cid); 622 case VHOST_VSOCK_SET_RUNNING: 623 if (copy_from_user(&start, argp, sizeof(start))) 624 return -EFAULT; 625 if (start) 626 return vhost_vsock_start(vsock); 627 else 628 return vhost_vsock_stop(vsock); 629 case VHOST_GET_FEATURES: 630 features = VHOST_VSOCK_FEATURES; 631 if (copy_to_user(argp, &features, sizeof(features))) 632 return -EFAULT; 633 return 0; 634 case VHOST_SET_FEATURES: 635 if (copy_from_user(&features, argp, sizeof(features))) 636 return -EFAULT; 637 return vhost_vsock_set_features(vsock, features); 638 default: 639 mutex_lock(&vsock->dev.mutex); 640 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 641 if (r == -ENOIOCTLCMD) 642 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 643 else 644 vhost_vsock_flush(vsock); 645 mutex_unlock(&vsock->dev.mutex); 646 return r; 647 } 648 } 649 650 static const struct file_operations vhost_vsock_fops = { 651 .owner = THIS_MODULE, 652 .open = vhost_vsock_dev_open, 653 .release = vhost_vsock_dev_release, 654 .llseek = noop_llseek, 655 .unlocked_ioctl = vhost_vsock_dev_ioctl, 656 }; 657 658 static struct miscdevice vhost_vsock_misc = { 659 .minor = MISC_DYNAMIC_MINOR, 660 .name = "vhost-vsock", 661 .fops = &vhost_vsock_fops, 662 }; 663 664 static struct virtio_transport vhost_transport = { 665 .transport = { 666 .get_local_cid = vhost_transport_get_local_cid, 667 668 .init = virtio_transport_do_socket_init, 669 .destruct = virtio_transport_destruct, 670 .release = virtio_transport_release, 671 .connect = virtio_transport_connect, 672 .shutdown = virtio_transport_shutdown, 673 674 .dgram_enqueue = virtio_transport_dgram_enqueue, 675 .dgram_dequeue = virtio_transport_dgram_dequeue, 676 .dgram_bind = virtio_transport_dgram_bind, 677 .dgram_allow = virtio_transport_dgram_allow, 678 679 .stream_enqueue = virtio_transport_stream_enqueue, 680 .stream_dequeue = virtio_transport_stream_dequeue, 681 .stream_has_data = virtio_transport_stream_has_data, 682 .stream_has_space = virtio_transport_stream_has_space, 683 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 684 .stream_is_active = virtio_transport_stream_is_active, 685 .stream_allow = virtio_transport_stream_allow, 686 687 .notify_poll_in = virtio_transport_notify_poll_in, 688 .notify_poll_out = virtio_transport_notify_poll_out, 689 .notify_recv_init = virtio_transport_notify_recv_init, 690 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 691 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 692 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 693 .notify_send_init = virtio_transport_notify_send_init, 694 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 695 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 696 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 697 698 .set_buffer_size = virtio_transport_set_buffer_size, 699 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 700 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 701 .get_buffer_size = virtio_transport_get_buffer_size, 702 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 703 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 704 }, 705 706 .send_pkt = vhost_transport_send_pkt, 707 }; 708 709 static int __init vhost_vsock_init(void) 710 { 711 int ret; 712 713 ret = vsock_core_init(&vhost_transport.transport); 714 if (ret < 0) 715 return ret; 716 return misc_register(&vhost_vsock_misc); 717 }; 718 719 static void __exit vhost_vsock_exit(void) 720 { 721 misc_deregister(&vhost_vsock_misc); 722 vsock_core_exit(); 723 }; 724 725 module_init(vhost_vsock_init); 726 module_exit(vhost_vsock_exit); 727 MODULE_LICENSE("GPL v2"); 728 MODULE_AUTHOR("Asias He"); 729 MODULE_DESCRIPTION("vhost transport for vsock "); 730