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 u32 len; 311 312 if (!vhost_vsock_more_replies(vsock)) { 313 /* Stop tx until the device processes already 314 * pending replies. Leave tx virtqueue 315 * callbacks disabled. 316 */ 317 goto no_more_replies; 318 } 319 320 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 321 &out, &in, NULL, NULL); 322 if (head < 0) 323 break; 324 325 if (head == vq->num) { 326 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 327 vhost_disable_notify(&vsock->dev, vq); 328 continue; 329 } 330 break; 331 } 332 333 pkt = vhost_vsock_alloc_pkt(vq, out, in); 334 if (!pkt) { 335 vq_err(vq, "Faulted on pkt\n"); 336 continue; 337 } 338 339 len = pkt->len; 340 341 /* Only accept correctly addressed packets */ 342 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 343 virtio_transport_recv_pkt(pkt); 344 else 345 virtio_transport_free_pkt(pkt); 346 347 vhost_add_used(vq, head, sizeof(pkt->hdr) + len); 348 added = true; 349 } 350 351 no_more_replies: 352 if (added) 353 vhost_signal(&vsock->dev, vq); 354 355 out: 356 mutex_unlock(&vq->mutex); 357 } 358 359 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 360 { 361 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 362 poll.work); 363 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 364 dev); 365 366 vhost_transport_do_send_pkt(vsock, vq); 367 } 368 369 static int vhost_vsock_start(struct vhost_vsock *vsock) 370 { 371 size_t i; 372 int ret; 373 374 mutex_lock(&vsock->dev.mutex); 375 376 ret = vhost_dev_check_owner(&vsock->dev); 377 if (ret) 378 goto err; 379 380 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 381 struct vhost_virtqueue *vq = &vsock->vqs[i]; 382 383 mutex_lock(&vq->mutex); 384 385 if (!vhost_vq_access_ok(vq)) { 386 ret = -EFAULT; 387 mutex_unlock(&vq->mutex); 388 goto err_vq; 389 } 390 391 if (!vq->private_data) { 392 vq->private_data = vsock; 393 vhost_vq_init_access(vq); 394 } 395 396 mutex_unlock(&vq->mutex); 397 } 398 399 mutex_unlock(&vsock->dev.mutex); 400 return 0; 401 402 err_vq: 403 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 404 struct vhost_virtqueue *vq = &vsock->vqs[i]; 405 406 mutex_lock(&vq->mutex); 407 vq->private_data = NULL; 408 mutex_unlock(&vq->mutex); 409 } 410 err: 411 mutex_unlock(&vsock->dev.mutex); 412 return ret; 413 } 414 415 static int vhost_vsock_stop(struct vhost_vsock *vsock) 416 { 417 size_t i; 418 int ret; 419 420 mutex_lock(&vsock->dev.mutex); 421 422 ret = vhost_dev_check_owner(&vsock->dev); 423 if (ret) 424 goto err; 425 426 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 427 struct vhost_virtqueue *vq = &vsock->vqs[i]; 428 429 mutex_lock(&vq->mutex); 430 vq->private_data = NULL; 431 mutex_unlock(&vq->mutex); 432 } 433 434 err: 435 mutex_unlock(&vsock->dev.mutex); 436 return ret; 437 } 438 439 static void vhost_vsock_free(struct vhost_vsock *vsock) 440 { 441 kvfree(vsock); 442 } 443 444 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 445 { 446 struct vhost_virtqueue **vqs; 447 struct vhost_vsock *vsock; 448 int ret; 449 450 /* This struct is large and allocation could fail, fall back to vmalloc 451 * if there is no other way. 452 */ 453 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); 454 if (!vsock) { 455 vsock = vmalloc(sizeof(*vsock)); 456 if (!vsock) 457 return -ENOMEM; 458 } 459 460 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 461 if (!vqs) { 462 ret = -ENOMEM; 463 goto out; 464 } 465 466 atomic_set(&vsock->queued_replies, 0); 467 468 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 469 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 470 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 471 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 472 473 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs)); 474 475 file->private_data = vsock; 476 spin_lock_init(&vsock->send_pkt_list_lock); 477 INIT_LIST_HEAD(&vsock->send_pkt_list); 478 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 479 480 spin_lock_bh(&vhost_vsock_lock); 481 list_add_tail(&vsock->list, &vhost_vsock_list); 482 spin_unlock_bh(&vhost_vsock_lock); 483 return 0; 484 485 out: 486 vhost_vsock_free(vsock); 487 return ret; 488 } 489 490 static void vhost_vsock_flush(struct vhost_vsock *vsock) 491 { 492 int i; 493 494 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 495 if (vsock->vqs[i].handle_kick) 496 vhost_poll_flush(&vsock->vqs[i].poll); 497 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 498 } 499 500 static void vhost_vsock_reset_orphans(struct sock *sk) 501 { 502 struct vsock_sock *vsk = vsock_sk(sk); 503 504 /* vmci_transport.c doesn't take sk_lock here either. At least we're 505 * under vsock_table_lock so the sock cannot disappear while we're 506 * executing. 507 */ 508 509 if (!vhost_vsock_get(vsk->local_addr.svm_cid)) { 510 sock_set_flag(sk, SOCK_DONE); 511 vsk->peer_shutdown = SHUTDOWN_MASK; 512 sk->sk_state = SS_UNCONNECTED; 513 sk->sk_err = ECONNRESET; 514 sk->sk_error_report(sk); 515 } 516 } 517 518 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 519 { 520 struct vhost_vsock *vsock = file->private_data; 521 522 spin_lock_bh(&vhost_vsock_lock); 523 list_del(&vsock->list); 524 spin_unlock_bh(&vhost_vsock_lock); 525 526 /* Iterating over all connections for all CIDs to find orphans is 527 * inefficient. Room for improvement here. */ 528 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 529 530 vhost_vsock_stop(vsock); 531 vhost_vsock_flush(vsock); 532 vhost_dev_stop(&vsock->dev); 533 534 spin_lock_bh(&vsock->send_pkt_list_lock); 535 while (!list_empty(&vsock->send_pkt_list)) { 536 struct virtio_vsock_pkt *pkt; 537 538 pkt = list_first_entry(&vsock->send_pkt_list, 539 struct virtio_vsock_pkt, list); 540 list_del_init(&pkt->list); 541 virtio_transport_free_pkt(pkt); 542 } 543 spin_unlock_bh(&vsock->send_pkt_list_lock); 544 545 vhost_dev_cleanup(&vsock->dev, false); 546 kfree(vsock->dev.vqs); 547 vhost_vsock_free(vsock); 548 return 0; 549 } 550 551 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 552 { 553 struct vhost_vsock *other; 554 555 /* Refuse reserved CIDs */ 556 if (guest_cid <= VMADDR_CID_HOST || 557 guest_cid == U32_MAX) 558 return -EINVAL; 559 560 /* 64-bit CIDs are not yet supported */ 561 if (guest_cid > U32_MAX) 562 return -EINVAL; 563 564 /* Refuse if CID is already in use */ 565 other = vhost_vsock_get(guest_cid); 566 if (other && other != vsock) 567 return -EADDRINUSE; 568 569 spin_lock_bh(&vhost_vsock_lock); 570 vsock->guest_cid = guest_cid; 571 spin_unlock_bh(&vhost_vsock_lock); 572 573 return 0; 574 } 575 576 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 577 { 578 struct vhost_virtqueue *vq; 579 int i; 580 581 if (features & ~VHOST_VSOCK_FEATURES) 582 return -EOPNOTSUPP; 583 584 mutex_lock(&vsock->dev.mutex); 585 if ((features & (1 << VHOST_F_LOG_ALL)) && 586 !vhost_log_access_ok(&vsock->dev)) { 587 mutex_unlock(&vsock->dev.mutex); 588 return -EFAULT; 589 } 590 591 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 592 vq = &vsock->vqs[i]; 593 mutex_lock(&vq->mutex); 594 vq->acked_features = features; 595 mutex_unlock(&vq->mutex); 596 } 597 mutex_unlock(&vsock->dev.mutex); 598 return 0; 599 } 600 601 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 602 unsigned long arg) 603 { 604 struct vhost_vsock *vsock = f->private_data; 605 void __user *argp = (void __user *)arg; 606 u64 guest_cid; 607 u64 features; 608 int start; 609 int r; 610 611 switch (ioctl) { 612 case VHOST_VSOCK_SET_GUEST_CID: 613 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 614 return -EFAULT; 615 return vhost_vsock_set_cid(vsock, guest_cid); 616 case VHOST_VSOCK_SET_RUNNING: 617 if (copy_from_user(&start, argp, sizeof(start))) 618 return -EFAULT; 619 if (start) 620 return vhost_vsock_start(vsock); 621 else 622 return vhost_vsock_stop(vsock); 623 case VHOST_GET_FEATURES: 624 features = VHOST_VSOCK_FEATURES; 625 if (copy_to_user(argp, &features, sizeof(features))) 626 return -EFAULT; 627 return 0; 628 case VHOST_SET_FEATURES: 629 if (copy_from_user(&features, argp, sizeof(features))) 630 return -EFAULT; 631 return vhost_vsock_set_features(vsock, features); 632 default: 633 mutex_lock(&vsock->dev.mutex); 634 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 635 if (r == -ENOIOCTLCMD) 636 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 637 else 638 vhost_vsock_flush(vsock); 639 mutex_unlock(&vsock->dev.mutex); 640 return r; 641 } 642 } 643 644 static const struct file_operations vhost_vsock_fops = { 645 .owner = THIS_MODULE, 646 .open = vhost_vsock_dev_open, 647 .release = vhost_vsock_dev_release, 648 .llseek = noop_llseek, 649 .unlocked_ioctl = vhost_vsock_dev_ioctl, 650 }; 651 652 static struct miscdevice vhost_vsock_misc = { 653 .minor = MISC_DYNAMIC_MINOR, 654 .name = "vhost-vsock", 655 .fops = &vhost_vsock_fops, 656 }; 657 658 static struct virtio_transport vhost_transport = { 659 .transport = { 660 .get_local_cid = vhost_transport_get_local_cid, 661 662 .init = virtio_transport_do_socket_init, 663 .destruct = virtio_transport_destruct, 664 .release = virtio_transport_release, 665 .connect = virtio_transport_connect, 666 .shutdown = virtio_transport_shutdown, 667 668 .dgram_enqueue = virtio_transport_dgram_enqueue, 669 .dgram_dequeue = virtio_transport_dgram_dequeue, 670 .dgram_bind = virtio_transport_dgram_bind, 671 .dgram_allow = virtio_transport_dgram_allow, 672 673 .stream_enqueue = virtio_transport_stream_enqueue, 674 .stream_dequeue = virtio_transport_stream_dequeue, 675 .stream_has_data = virtio_transport_stream_has_data, 676 .stream_has_space = virtio_transport_stream_has_space, 677 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 678 .stream_is_active = virtio_transport_stream_is_active, 679 .stream_allow = virtio_transport_stream_allow, 680 681 .notify_poll_in = virtio_transport_notify_poll_in, 682 .notify_poll_out = virtio_transport_notify_poll_out, 683 .notify_recv_init = virtio_transport_notify_recv_init, 684 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 685 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 686 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 687 .notify_send_init = virtio_transport_notify_send_init, 688 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 689 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 690 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 691 692 .set_buffer_size = virtio_transport_set_buffer_size, 693 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 694 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 695 .get_buffer_size = virtio_transport_get_buffer_size, 696 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 697 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 698 }, 699 700 .send_pkt = vhost_transport_send_pkt, 701 }; 702 703 static int __init vhost_vsock_init(void) 704 { 705 int ret; 706 707 ret = vsock_core_init(&vhost_transport.transport); 708 if (ret < 0) 709 return ret; 710 return misc_register(&vhost_vsock_misc); 711 }; 712 713 static void __exit vhost_vsock_exit(void) 714 { 715 misc_deregister(&vhost_vsock_misc); 716 vsock_core_exit(); 717 }; 718 719 module_init(vhost_vsock_init); 720 module_exit(vhost_vsock_exit); 721 MODULE_LICENSE("GPL v2"); 722 MODULE_AUTHOR("Asias He"); 723 MODULE_DESCRIPTION("vhost transport for vsock "); 724