1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * virtio transport for vsock 4 * 5 * Copyright (C) 2013-2015 Red Hat, Inc. 6 * Author: Asias He <asias@redhat.com> 7 * Stefan Hajnoczi <stefanha@redhat.com> 8 * 9 * Some of the code is take from Gerd Hoffmann <kraxel@redhat.com>'s 10 * early virtio-vsock proof-of-concept bits. 11 */ 12 #include <linux/spinlock.h> 13 #include <linux/module.h> 14 #include <linux/list.h> 15 #include <linux/atomic.h> 16 #include <linux/virtio.h> 17 #include <linux/virtio_ids.h> 18 #include <linux/virtio_config.h> 19 #include <linux/virtio_vsock.h> 20 #include <net/sock.h> 21 #include <linux/mutex.h> 22 #include <net/af_vsock.h> 23 24 static struct workqueue_struct *virtio_vsock_workqueue; 25 static struct virtio_vsock *the_virtio_vsock; 26 static DEFINE_MUTEX(the_virtio_vsock_mutex); /* protects the_virtio_vsock */ 27 28 struct virtio_vsock { 29 struct virtio_device *vdev; 30 struct virtqueue *vqs[VSOCK_VQ_MAX]; 31 32 /* Virtqueue processing is deferred to a workqueue */ 33 struct work_struct tx_work; 34 struct work_struct rx_work; 35 struct work_struct event_work; 36 37 /* The following fields are protected by tx_lock. vqs[VSOCK_VQ_TX] 38 * must be accessed with tx_lock held. 39 */ 40 struct mutex tx_lock; 41 bool tx_run; 42 43 struct work_struct send_pkt_work; 44 spinlock_t send_pkt_list_lock; 45 struct list_head send_pkt_list; 46 47 atomic_t queued_replies; 48 49 /* The following fields are protected by rx_lock. vqs[VSOCK_VQ_RX] 50 * must be accessed with rx_lock held. 51 */ 52 struct mutex rx_lock; 53 bool rx_run; 54 int rx_buf_nr; 55 int rx_buf_max_nr; 56 57 /* The following fields are protected by event_lock. 58 * vqs[VSOCK_VQ_EVENT] must be accessed with event_lock held. 59 */ 60 struct mutex event_lock; 61 bool event_run; 62 struct virtio_vsock_event event_list[8]; 63 64 u32 guest_cid; 65 }; 66 67 static u32 virtio_transport_get_local_cid(void) 68 { 69 struct virtio_vsock *vsock; 70 u32 ret; 71 72 rcu_read_lock(); 73 vsock = rcu_dereference(the_virtio_vsock); 74 if (!vsock) { 75 ret = VMADDR_CID_ANY; 76 goto out_rcu; 77 } 78 79 ret = vsock->guest_cid; 80 out_rcu: 81 rcu_read_unlock(); 82 return ret; 83 } 84 85 static void 86 virtio_transport_send_pkt_work(struct work_struct *work) 87 { 88 struct virtio_vsock *vsock = 89 container_of(work, struct virtio_vsock, send_pkt_work); 90 struct virtqueue *vq; 91 bool added = false; 92 bool restart_rx = false; 93 94 mutex_lock(&vsock->tx_lock); 95 96 if (!vsock->tx_run) 97 goto out; 98 99 vq = vsock->vqs[VSOCK_VQ_TX]; 100 101 for (;;) { 102 struct virtio_vsock_pkt *pkt; 103 struct scatterlist hdr, buf, *sgs[2]; 104 int ret, in_sg = 0, out_sg = 0; 105 bool reply; 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 break; 111 } 112 113 pkt = list_first_entry(&vsock->send_pkt_list, 114 struct virtio_vsock_pkt, list); 115 list_del_init(&pkt->list); 116 spin_unlock_bh(&vsock->send_pkt_list_lock); 117 118 virtio_transport_deliver_tap_pkt(pkt); 119 120 reply = pkt->reply; 121 122 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); 123 sgs[out_sg++] = &hdr; 124 if (pkt->buf) { 125 sg_init_one(&buf, pkt->buf, pkt->len); 126 sgs[out_sg++] = &buf; 127 } 128 129 ret = virtqueue_add_sgs(vq, sgs, out_sg, in_sg, pkt, GFP_KERNEL); 130 /* Usually this means that there is no more space available in 131 * the vq 132 */ 133 if (ret < 0) { 134 spin_lock_bh(&vsock->send_pkt_list_lock); 135 list_add(&pkt->list, &vsock->send_pkt_list); 136 spin_unlock_bh(&vsock->send_pkt_list_lock); 137 break; 138 } 139 140 if (reply) { 141 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; 142 int val; 143 144 val = atomic_dec_return(&vsock->queued_replies); 145 146 /* Do we now have resources to resume rx processing? */ 147 if (val + 1 == virtqueue_get_vring_size(rx_vq)) 148 restart_rx = true; 149 } 150 151 added = true; 152 } 153 154 if (added) 155 virtqueue_kick(vq); 156 157 out: 158 mutex_unlock(&vsock->tx_lock); 159 160 if (restart_rx) 161 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 162 } 163 164 static int 165 virtio_transport_send_pkt(struct virtio_vsock_pkt *pkt) 166 { 167 struct virtio_vsock *vsock; 168 int len = pkt->len; 169 170 rcu_read_lock(); 171 vsock = rcu_dereference(the_virtio_vsock); 172 if (!vsock) { 173 virtio_transport_free_pkt(pkt); 174 len = -ENODEV; 175 goto out_rcu; 176 } 177 178 if (le64_to_cpu(pkt->hdr.dst_cid) == vsock->guest_cid) { 179 virtio_transport_free_pkt(pkt); 180 len = -ENODEV; 181 goto out_rcu; 182 } 183 184 if (pkt->reply) 185 atomic_inc(&vsock->queued_replies); 186 187 spin_lock_bh(&vsock->send_pkt_list_lock); 188 list_add_tail(&pkt->list, &vsock->send_pkt_list); 189 spin_unlock_bh(&vsock->send_pkt_list_lock); 190 191 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); 192 193 out_rcu: 194 rcu_read_unlock(); 195 return len; 196 } 197 198 static int 199 virtio_transport_cancel_pkt(struct vsock_sock *vsk) 200 { 201 struct virtio_vsock *vsock; 202 struct virtio_vsock_pkt *pkt, *n; 203 int cnt = 0, ret; 204 LIST_HEAD(freeme); 205 206 rcu_read_lock(); 207 vsock = rcu_dereference(the_virtio_vsock); 208 if (!vsock) { 209 ret = -ENODEV; 210 goto out_rcu; 211 } 212 213 spin_lock_bh(&vsock->send_pkt_list_lock); 214 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 215 if (pkt->vsk != vsk) 216 continue; 217 list_move(&pkt->list, &freeme); 218 } 219 spin_unlock_bh(&vsock->send_pkt_list_lock); 220 221 list_for_each_entry_safe(pkt, n, &freeme, list) { 222 if (pkt->reply) 223 cnt++; 224 list_del(&pkt->list); 225 virtio_transport_free_pkt(pkt); 226 } 227 228 if (cnt) { 229 struct virtqueue *rx_vq = vsock->vqs[VSOCK_VQ_RX]; 230 int new_cnt; 231 232 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 233 if (new_cnt + cnt >= virtqueue_get_vring_size(rx_vq) && 234 new_cnt < virtqueue_get_vring_size(rx_vq)) 235 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 236 } 237 238 ret = 0; 239 240 out_rcu: 241 rcu_read_unlock(); 242 return ret; 243 } 244 245 static void virtio_vsock_rx_fill(struct virtio_vsock *vsock) 246 { 247 int buf_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE; 248 struct virtio_vsock_pkt *pkt; 249 struct scatterlist hdr, buf, *sgs[2]; 250 struct virtqueue *vq; 251 int ret; 252 253 vq = vsock->vqs[VSOCK_VQ_RX]; 254 255 do { 256 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 257 if (!pkt) 258 break; 259 260 pkt->buf = kmalloc(buf_len, GFP_KERNEL); 261 if (!pkt->buf) { 262 virtio_transport_free_pkt(pkt); 263 break; 264 } 265 266 pkt->buf_len = buf_len; 267 pkt->len = buf_len; 268 269 sg_init_one(&hdr, &pkt->hdr, sizeof(pkt->hdr)); 270 sgs[0] = &hdr; 271 272 sg_init_one(&buf, pkt->buf, buf_len); 273 sgs[1] = &buf; 274 ret = virtqueue_add_sgs(vq, sgs, 0, 2, pkt, GFP_KERNEL); 275 if (ret) { 276 virtio_transport_free_pkt(pkt); 277 break; 278 } 279 vsock->rx_buf_nr++; 280 } while (vq->num_free); 281 if (vsock->rx_buf_nr > vsock->rx_buf_max_nr) 282 vsock->rx_buf_max_nr = vsock->rx_buf_nr; 283 virtqueue_kick(vq); 284 } 285 286 static void virtio_transport_tx_work(struct work_struct *work) 287 { 288 struct virtio_vsock *vsock = 289 container_of(work, struct virtio_vsock, tx_work); 290 struct virtqueue *vq; 291 bool added = false; 292 293 vq = vsock->vqs[VSOCK_VQ_TX]; 294 mutex_lock(&vsock->tx_lock); 295 296 if (!vsock->tx_run) 297 goto out; 298 299 do { 300 struct virtio_vsock_pkt *pkt; 301 unsigned int len; 302 303 virtqueue_disable_cb(vq); 304 while ((pkt = virtqueue_get_buf(vq, &len)) != NULL) { 305 virtio_transport_free_pkt(pkt); 306 added = true; 307 } 308 } while (!virtqueue_enable_cb(vq)); 309 310 out: 311 mutex_unlock(&vsock->tx_lock); 312 313 if (added) 314 queue_work(virtio_vsock_workqueue, &vsock->send_pkt_work); 315 } 316 317 /* Is there space left for replies to rx packets? */ 318 static bool virtio_transport_more_replies(struct virtio_vsock *vsock) 319 { 320 struct virtqueue *vq = vsock->vqs[VSOCK_VQ_RX]; 321 int val; 322 323 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 324 val = atomic_read(&vsock->queued_replies); 325 326 return val < virtqueue_get_vring_size(vq); 327 } 328 329 /* event_lock must be held */ 330 static int virtio_vsock_event_fill_one(struct virtio_vsock *vsock, 331 struct virtio_vsock_event *event) 332 { 333 struct scatterlist sg; 334 struct virtqueue *vq; 335 336 vq = vsock->vqs[VSOCK_VQ_EVENT]; 337 338 sg_init_one(&sg, event, sizeof(*event)); 339 340 return virtqueue_add_inbuf(vq, &sg, 1, event, GFP_KERNEL); 341 } 342 343 /* event_lock must be held */ 344 static void virtio_vsock_event_fill(struct virtio_vsock *vsock) 345 { 346 size_t i; 347 348 for (i = 0; i < ARRAY_SIZE(vsock->event_list); i++) { 349 struct virtio_vsock_event *event = &vsock->event_list[i]; 350 351 virtio_vsock_event_fill_one(vsock, event); 352 } 353 354 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); 355 } 356 357 static void virtio_vsock_reset_sock(struct sock *sk) 358 { 359 lock_sock(sk); 360 sk->sk_state = TCP_CLOSE; 361 sk->sk_err = ECONNRESET; 362 sk->sk_error_report(sk); 363 release_sock(sk); 364 } 365 366 static void virtio_vsock_update_guest_cid(struct virtio_vsock *vsock) 367 { 368 struct virtio_device *vdev = vsock->vdev; 369 __le64 guest_cid; 370 371 vdev->config->get(vdev, offsetof(struct virtio_vsock_config, guest_cid), 372 &guest_cid, sizeof(guest_cid)); 373 vsock->guest_cid = le64_to_cpu(guest_cid); 374 } 375 376 /* event_lock must be held */ 377 static void virtio_vsock_event_handle(struct virtio_vsock *vsock, 378 struct virtio_vsock_event *event) 379 { 380 switch (le32_to_cpu(event->id)) { 381 case VIRTIO_VSOCK_EVENT_TRANSPORT_RESET: 382 virtio_vsock_update_guest_cid(vsock); 383 vsock_for_each_connected_socket(virtio_vsock_reset_sock); 384 break; 385 } 386 } 387 388 static void virtio_transport_event_work(struct work_struct *work) 389 { 390 struct virtio_vsock *vsock = 391 container_of(work, struct virtio_vsock, event_work); 392 struct virtqueue *vq; 393 394 vq = vsock->vqs[VSOCK_VQ_EVENT]; 395 396 mutex_lock(&vsock->event_lock); 397 398 if (!vsock->event_run) 399 goto out; 400 401 do { 402 struct virtio_vsock_event *event; 403 unsigned int len; 404 405 virtqueue_disable_cb(vq); 406 while ((event = virtqueue_get_buf(vq, &len)) != NULL) { 407 if (len == sizeof(*event)) 408 virtio_vsock_event_handle(vsock, event); 409 410 virtio_vsock_event_fill_one(vsock, event); 411 } 412 } while (!virtqueue_enable_cb(vq)); 413 414 virtqueue_kick(vsock->vqs[VSOCK_VQ_EVENT]); 415 out: 416 mutex_unlock(&vsock->event_lock); 417 } 418 419 static void virtio_vsock_event_done(struct virtqueue *vq) 420 { 421 struct virtio_vsock *vsock = vq->vdev->priv; 422 423 if (!vsock) 424 return; 425 queue_work(virtio_vsock_workqueue, &vsock->event_work); 426 } 427 428 static void virtio_vsock_tx_done(struct virtqueue *vq) 429 { 430 struct virtio_vsock *vsock = vq->vdev->priv; 431 432 if (!vsock) 433 return; 434 queue_work(virtio_vsock_workqueue, &vsock->tx_work); 435 } 436 437 static void virtio_vsock_rx_done(struct virtqueue *vq) 438 { 439 struct virtio_vsock *vsock = vq->vdev->priv; 440 441 if (!vsock) 442 return; 443 queue_work(virtio_vsock_workqueue, &vsock->rx_work); 444 } 445 446 static struct virtio_transport virtio_transport = { 447 .transport = { 448 .module = THIS_MODULE, 449 450 .get_local_cid = virtio_transport_get_local_cid, 451 452 .init = virtio_transport_do_socket_init, 453 .destruct = virtio_transport_destruct, 454 .release = virtio_transport_release, 455 .connect = virtio_transport_connect, 456 .shutdown = virtio_transport_shutdown, 457 .cancel_pkt = virtio_transport_cancel_pkt, 458 459 .dgram_bind = virtio_transport_dgram_bind, 460 .dgram_dequeue = virtio_transport_dgram_dequeue, 461 .dgram_enqueue = virtio_transport_dgram_enqueue, 462 .dgram_allow = virtio_transport_dgram_allow, 463 464 .stream_dequeue = virtio_transport_stream_dequeue, 465 .stream_enqueue = virtio_transport_stream_enqueue, 466 .stream_has_data = virtio_transport_stream_has_data, 467 .stream_has_space = virtio_transport_stream_has_space, 468 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 469 .stream_is_active = virtio_transport_stream_is_active, 470 .stream_allow = virtio_transport_stream_allow, 471 472 .notify_poll_in = virtio_transport_notify_poll_in, 473 .notify_poll_out = virtio_transport_notify_poll_out, 474 .notify_recv_init = virtio_transport_notify_recv_init, 475 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 476 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 477 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 478 .notify_send_init = virtio_transport_notify_send_init, 479 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 480 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 481 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 482 .notify_buffer_size = virtio_transport_notify_buffer_size, 483 }, 484 485 .send_pkt = virtio_transport_send_pkt, 486 }; 487 488 static void virtio_transport_rx_work(struct work_struct *work) 489 { 490 struct virtio_vsock *vsock = 491 container_of(work, struct virtio_vsock, rx_work); 492 struct virtqueue *vq; 493 494 vq = vsock->vqs[VSOCK_VQ_RX]; 495 496 mutex_lock(&vsock->rx_lock); 497 498 if (!vsock->rx_run) 499 goto out; 500 501 do { 502 virtqueue_disable_cb(vq); 503 for (;;) { 504 struct virtio_vsock_pkt *pkt; 505 unsigned int len; 506 507 if (!virtio_transport_more_replies(vsock)) { 508 /* Stop rx until the device processes already 509 * pending replies. Leave rx virtqueue 510 * callbacks disabled. 511 */ 512 goto out; 513 } 514 515 pkt = virtqueue_get_buf(vq, &len); 516 if (!pkt) { 517 break; 518 } 519 520 vsock->rx_buf_nr--; 521 522 /* Drop short/long packets */ 523 if (unlikely(len < sizeof(pkt->hdr) || 524 len > sizeof(pkt->hdr) + pkt->len)) { 525 virtio_transport_free_pkt(pkt); 526 continue; 527 } 528 529 pkt->len = len - sizeof(pkt->hdr); 530 virtio_transport_deliver_tap_pkt(pkt); 531 virtio_transport_recv_pkt(&virtio_transport, pkt); 532 } 533 } while (!virtqueue_enable_cb(vq)); 534 535 out: 536 if (vsock->rx_buf_nr < vsock->rx_buf_max_nr / 2) 537 virtio_vsock_rx_fill(vsock); 538 mutex_unlock(&vsock->rx_lock); 539 } 540 541 static int virtio_vsock_probe(struct virtio_device *vdev) 542 { 543 vq_callback_t *callbacks[] = { 544 virtio_vsock_rx_done, 545 virtio_vsock_tx_done, 546 virtio_vsock_event_done, 547 }; 548 static const char * const names[] = { 549 "rx", 550 "tx", 551 "event", 552 }; 553 struct virtio_vsock *vsock = NULL; 554 int ret; 555 556 ret = mutex_lock_interruptible(&the_virtio_vsock_mutex); 557 if (ret) 558 return ret; 559 560 /* Only one virtio-vsock device per guest is supported */ 561 if (rcu_dereference_protected(the_virtio_vsock, 562 lockdep_is_held(&the_virtio_vsock_mutex))) { 563 ret = -EBUSY; 564 goto out; 565 } 566 567 vsock = kzalloc(sizeof(*vsock), GFP_KERNEL); 568 if (!vsock) { 569 ret = -ENOMEM; 570 goto out; 571 } 572 573 vsock->vdev = vdev; 574 575 ret = virtio_find_vqs(vsock->vdev, VSOCK_VQ_MAX, 576 vsock->vqs, callbacks, names, 577 NULL); 578 if (ret < 0) 579 goto out; 580 581 virtio_vsock_update_guest_cid(vsock); 582 583 vsock->rx_buf_nr = 0; 584 vsock->rx_buf_max_nr = 0; 585 atomic_set(&vsock->queued_replies, 0); 586 587 mutex_init(&vsock->tx_lock); 588 mutex_init(&vsock->rx_lock); 589 mutex_init(&vsock->event_lock); 590 spin_lock_init(&vsock->send_pkt_list_lock); 591 INIT_LIST_HEAD(&vsock->send_pkt_list); 592 INIT_WORK(&vsock->rx_work, virtio_transport_rx_work); 593 INIT_WORK(&vsock->tx_work, virtio_transport_tx_work); 594 INIT_WORK(&vsock->event_work, virtio_transport_event_work); 595 INIT_WORK(&vsock->send_pkt_work, virtio_transport_send_pkt_work); 596 597 mutex_lock(&vsock->tx_lock); 598 vsock->tx_run = true; 599 mutex_unlock(&vsock->tx_lock); 600 601 mutex_lock(&vsock->rx_lock); 602 virtio_vsock_rx_fill(vsock); 603 vsock->rx_run = true; 604 mutex_unlock(&vsock->rx_lock); 605 606 mutex_lock(&vsock->event_lock); 607 virtio_vsock_event_fill(vsock); 608 vsock->event_run = true; 609 mutex_unlock(&vsock->event_lock); 610 611 vdev->priv = vsock; 612 rcu_assign_pointer(the_virtio_vsock, vsock); 613 614 mutex_unlock(&the_virtio_vsock_mutex); 615 return 0; 616 617 out: 618 kfree(vsock); 619 mutex_unlock(&the_virtio_vsock_mutex); 620 return ret; 621 } 622 623 static void virtio_vsock_remove(struct virtio_device *vdev) 624 { 625 struct virtio_vsock *vsock = vdev->priv; 626 struct virtio_vsock_pkt *pkt; 627 628 mutex_lock(&the_virtio_vsock_mutex); 629 630 vdev->priv = NULL; 631 rcu_assign_pointer(the_virtio_vsock, NULL); 632 synchronize_rcu(); 633 634 /* Reset all connected sockets when the device disappear */ 635 vsock_for_each_connected_socket(virtio_vsock_reset_sock); 636 637 /* Stop all work handlers to make sure no one is accessing the device, 638 * so we can safely call vdev->config->reset(). 639 */ 640 mutex_lock(&vsock->rx_lock); 641 vsock->rx_run = false; 642 mutex_unlock(&vsock->rx_lock); 643 644 mutex_lock(&vsock->tx_lock); 645 vsock->tx_run = false; 646 mutex_unlock(&vsock->tx_lock); 647 648 mutex_lock(&vsock->event_lock); 649 vsock->event_run = false; 650 mutex_unlock(&vsock->event_lock); 651 652 /* Flush all device writes and interrupts, device will not use any 653 * more buffers. 654 */ 655 vdev->config->reset(vdev); 656 657 mutex_lock(&vsock->rx_lock); 658 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_RX]))) 659 virtio_transport_free_pkt(pkt); 660 mutex_unlock(&vsock->rx_lock); 661 662 mutex_lock(&vsock->tx_lock); 663 while ((pkt = virtqueue_detach_unused_buf(vsock->vqs[VSOCK_VQ_TX]))) 664 virtio_transport_free_pkt(pkt); 665 mutex_unlock(&vsock->tx_lock); 666 667 spin_lock_bh(&vsock->send_pkt_list_lock); 668 while (!list_empty(&vsock->send_pkt_list)) { 669 pkt = list_first_entry(&vsock->send_pkt_list, 670 struct virtio_vsock_pkt, list); 671 list_del(&pkt->list); 672 virtio_transport_free_pkt(pkt); 673 } 674 spin_unlock_bh(&vsock->send_pkt_list_lock); 675 676 /* Delete virtqueues and flush outstanding callbacks if any */ 677 vdev->config->del_vqs(vdev); 678 679 /* Other works can be queued before 'config->del_vqs()', so we flush 680 * all works before to free the vsock object to avoid use after free. 681 */ 682 flush_work(&vsock->rx_work); 683 flush_work(&vsock->tx_work); 684 flush_work(&vsock->event_work); 685 flush_work(&vsock->send_pkt_work); 686 687 mutex_unlock(&the_virtio_vsock_mutex); 688 689 kfree(vsock); 690 } 691 692 static struct virtio_device_id id_table[] = { 693 { VIRTIO_ID_VSOCK, VIRTIO_DEV_ANY_ID }, 694 { 0 }, 695 }; 696 697 static unsigned int features[] = { 698 }; 699 700 static struct virtio_driver virtio_vsock_driver = { 701 .feature_table = features, 702 .feature_table_size = ARRAY_SIZE(features), 703 .driver.name = KBUILD_MODNAME, 704 .driver.owner = THIS_MODULE, 705 .id_table = id_table, 706 .probe = virtio_vsock_probe, 707 .remove = virtio_vsock_remove, 708 }; 709 710 static int __init virtio_vsock_init(void) 711 { 712 int ret; 713 714 virtio_vsock_workqueue = alloc_workqueue("virtio_vsock", 0, 0); 715 if (!virtio_vsock_workqueue) 716 return -ENOMEM; 717 718 ret = vsock_core_register(&virtio_transport.transport, 719 VSOCK_TRANSPORT_F_G2H); 720 if (ret) 721 goto out_wq; 722 723 ret = register_virtio_driver(&virtio_vsock_driver); 724 if (ret) 725 goto out_vci; 726 727 return 0; 728 729 out_vci: 730 vsock_core_unregister(&virtio_transport.transport); 731 out_wq: 732 destroy_workqueue(virtio_vsock_workqueue); 733 return ret; 734 } 735 736 static void __exit virtio_vsock_exit(void) 737 { 738 unregister_virtio_driver(&virtio_vsock_driver); 739 vsock_core_unregister(&virtio_transport.transport); 740 destroy_workqueue(virtio_vsock_workqueue); 741 } 742 743 module_init(virtio_vsock_init); 744 module_exit(virtio_vsock_exit); 745 MODULE_LICENSE("GPL v2"); 746 MODULE_AUTHOR("Asias He"); 747 MODULE_DESCRIPTION("virtio transport for vsock"); 748 MODULE_DEVICE_TABLE(virtio, id_table); 749