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 #include <linux/hashtable.h> 19 20 #include <net/af_vsock.h> 21 #include "vhost.h" 22 23 #define VHOST_VSOCK_DEFAULT_HOST_CID 2 24 25 enum { 26 VHOST_VSOCK_FEATURES = VHOST_FEATURES, 27 }; 28 29 /* Used to track all the vhost_vsock instances on the system. */ 30 static DEFINE_MUTEX(vhost_vsock_mutex); 31 static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8); 32 33 struct vhost_vsock { 34 struct vhost_dev dev; 35 struct vhost_virtqueue vqs[2]; 36 37 /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */ 38 struct hlist_node hash; 39 40 struct vhost_work send_pkt_work; 41 spinlock_t send_pkt_list_lock; 42 struct list_head send_pkt_list; /* host->guest pending packets */ 43 44 atomic_t queued_replies; 45 46 u32 guest_cid; 47 }; 48 49 static u32 vhost_transport_get_local_cid(void) 50 { 51 return VHOST_VSOCK_DEFAULT_HOST_CID; 52 } 53 54 /* Callers that dereference the return value must hold vhost_vsock_mutex or the 55 * RCU read lock. 56 */ 57 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 58 { 59 struct vhost_vsock *vsock; 60 61 hash_for_each_possible_rcu(vhost_vsock_hash, vsock, hash, guest_cid) { 62 u32 other_cid = vsock->guest_cid; 63 64 /* Skip instances that have no CID yet */ 65 if (other_cid == 0) 66 continue; 67 68 if (other_cid == guest_cid) 69 return vsock; 70 71 } 72 73 return NULL; 74 } 75 76 static void 77 vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 78 struct vhost_virtqueue *vq) 79 { 80 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 81 bool added = false; 82 bool restart_tx = false; 83 84 mutex_lock(&vq->mutex); 85 86 if (!vq->private_data) 87 goto out; 88 89 /* Avoid further vmexits, we're already processing the virtqueue */ 90 vhost_disable_notify(&vsock->dev, vq); 91 92 for (;;) { 93 struct virtio_vsock_pkt *pkt; 94 struct iov_iter iov_iter; 95 unsigned out, in; 96 size_t nbytes; 97 size_t len; 98 int head; 99 100 spin_lock_bh(&vsock->send_pkt_list_lock); 101 if (list_empty(&vsock->send_pkt_list)) { 102 spin_unlock_bh(&vsock->send_pkt_list_lock); 103 vhost_enable_notify(&vsock->dev, vq); 104 break; 105 } 106 107 pkt = list_first_entry(&vsock->send_pkt_list, 108 struct virtio_vsock_pkt, list); 109 list_del_init(&pkt->list); 110 spin_unlock_bh(&vsock->send_pkt_list_lock); 111 112 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 113 &out, &in, NULL, NULL); 114 if (head < 0) { 115 spin_lock_bh(&vsock->send_pkt_list_lock); 116 list_add(&pkt->list, &vsock->send_pkt_list); 117 spin_unlock_bh(&vsock->send_pkt_list_lock); 118 break; 119 } 120 121 if (head == vq->num) { 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); 125 126 /* We cannot finish yet if more buffers snuck in while 127 * re-enabling notify. 128 */ 129 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 130 vhost_disable_notify(&vsock->dev, vq); 131 continue; 132 } 133 break; 134 } 135 136 if (out) { 137 virtio_transport_free_pkt(pkt); 138 vq_err(vq, "Expected 0 output buffers, got %u\n", out); 139 break; 140 } 141 142 len = iov_length(&vq->iov[out], in); 143 iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len); 144 145 nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 146 if (nbytes != sizeof(pkt->hdr)) { 147 virtio_transport_free_pkt(pkt); 148 vq_err(vq, "Faulted on copying pkt hdr\n"); 149 break; 150 } 151 152 nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter); 153 if (nbytes != pkt->len) { 154 virtio_transport_free_pkt(pkt); 155 vq_err(vq, "Faulted on copying pkt buf\n"); 156 break; 157 } 158 159 vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); 160 added = true; 161 162 if (pkt->reply) { 163 int val; 164 165 val = atomic_dec_return(&vsock->queued_replies); 166 167 /* Do we have resources to resume tx processing? */ 168 if (val + 1 == tx_vq->num) 169 restart_tx = true; 170 } 171 172 /* Deliver to monitoring devices all correctly transmitted 173 * packets. 174 */ 175 virtio_transport_deliver_tap_pkt(pkt); 176 177 virtio_transport_free_pkt(pkt); 178 } 179 if (added) 180 vhost_signal(&vsock->dev, vq); 181 182 out: 183 mutex_unlock(&vq->mutex); 184 185 if (restart_tx) 186 vhost_poll_queue(&tx_vq->poll); 187 } 188 189 static void vhost_transport_send_pkt_work(struct vhost_work *work) 190 { 191 struct vhost_virtqueue *vq; 192 struct vhost_vsock *vsock; 193 194 vsock = container_of(work, struct vhost_vsock, send_pkt_work); 195 vq = &vsock->vqs[VSOCK_VQ_RX]; 196 197 vhost_transport_do_send_pkt(vsock, vq); 198 } 199 200 static int 201 vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) 202 { 203 struct vhost_vsock *vsock; 204 int len = pkt->len; 205 206 rcu_read_lock(); 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 rcu_read_unlock(); 212 virtio_transport_free_pkt(pkt); 213 return -ENODEV; 214 } 215 216 if (pkt->reply) 217 atomic_inc(&vsock->queued_replies); 218 219 spin_lock_bh(&vsock->send_pkt_list_lock); 220 list_add_tail(&pkt->list, &vsock->send_pkt_list); 221 spin_unlock_bh(&vsock->send_pkt_list_lock); 222 223 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 224 225 rcu_read_unlock(); 226 return len; 227 } 228 229 static int 230 vhost_transport_cancel_pkt(struct vsock_sock *vsk) 231 { 232 struct vhost_vsock *vsock; 233 struct virtio_vsock_pkt *pkt, *n; 234 int cnt = 0; 235 int ret = -ENODEV; 236 LIST_HEAD(freeme); 237 238 rcu_read_lock(); 239 240 /* Find the vhost_vsock according to guest context id */ 241 vsock = vhost_vsock_get(vsk->remote_addr.svm_cid); 242 if (!vsock) 243 goto out; 244 245 spin_lock_bh(&vsock->send_pkt_list_lock); 246 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 247 if (pkt->vsk != vsk) 248 continue; 249 list_move(&pkt->list, &freeme); 250 } 251 spin_unlock_bh(&vsock->send_pkt_list_lock); 252 253 list_for_each_entry_safe(pkt, n, &freeme, list) { 254 if (pkt->reply) 255 cnt++; 256 list_del(&pkt->list); 257 virtio_transport_free_pkt(pkt); 258 } 259 260 if (cnt) { 261 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 262 int new_cnt; 263 264 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 265 if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num) 266 vhost_poll_queue(&tx_vq->poll); 267 } 268 269 ret = 0; 270 out: 271 rcu_read_unlock(); 272 return ret; 273 } 274 275 static struct virtio_vsock_pkt * 276 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 277 unsigned int out, unsigned int in) 278 { 279 struct virtio_vsock_pkt *pkt; 280 struct iov_iter iov_iter; 281 size_t nbytes; 282 size_t len; 283 284 if (in != 0) { 285 vq_err(vq, "Expected 0 input buffers, got %u\n", in); 286 return NULL; 287 } 288 289 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 290 if (!pkt) 291 return NULL; 292 293 len = iov_length(vq->iov, out); 294 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 295 296 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 297 if (nbytes != sizeof(pkt->hdr)) { 298 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 299 sizeof(pkt->hdr), nbytes); 300 kfree(pkt); 301 return NULL; 302 } 303 304 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 305 pkt->len = le32_to_cpu(pkt->hdr.len); 306 307 /* No payload */ 308 if (!pkt->len) 309 return pkt; 310 311 /* The pkt is too big */ 312 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 313 kfree(pkt); 314 return NULL; 315 } 316 317 pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 318 if (!pkt->buf) { 319 kfree(pkt); 320 return NULL; 321 } 322 323 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 324 if (nbytes != pkt->len) { 325 vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 326 pkt->len, nbytes); 327 virtio_transport_free_pkt(pkt); 328 return NULL; 329 } 330 331 return pkt; 332 } 333 334 /* Is there space left for replies to rx packets? */ 335 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 336 { 337 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 338 int val; 339 340 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 341 val = atomic_read(&vsock->queued_replies); 342 343 return val < vq->num; 344 } 345 346 static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 347 { 348 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 349 poll.work); 350 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 351 dev); 352 struct virtio_vsock_pkt *pkt; 353 int head; 354 unsigned int out, in; 355 bool added = false; 356 357 mutex_lock(&vq->mutex); 358 359 if (!vq->private_data) 360 goto out; 361 362 vhost_disable_notify(&vsock->dev, vq); 363 for (;;) { 364 u32 len; 365 366 if (!vhost_vsock_more_replies(vsock)) { 367 /* Stop tx until the device processes already 368 * pending replies. Leave tx virtqueue 369 * callbacks disabled. 370 */ 371 goto no_more_replies; 372 } 373 374 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 375 &out, &in, NULL, NULL); 376 if (head < 0) 377 break; 378 379 if (head == vq->num) { 380 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 381 vhost_disable_notify(&vsock->dev, vq); 382 continue; 383 } 384 break; 385 } 386 387 pkt = vhost_vsock_alloc_pkt(vq, out, in); 388 if (!pkt) { 389 vq_err(vq, "Faulted on pkt\n"); 390 continue; 391 } 392 393 len = pkt->len; 394 395 /* Deliver to monitoring devices all received packets */ 396 virtio_transport_deliver_tap_pkt(pkt); 397 398 /* Only accept correctly addressed packets */ 399 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 400 virtio_transport_recv_pkt(pkt); 401 else 402 virtio_transport_free_pkt(pkt); 403 404 vhost_add_used(vq, head, sizeof(pkt->hdr) + len); 405 added = true; 406 } 407 408 no_more_replies: 409 if (added) 410 vhost_signal(&vsock->dev, vq); 411 412 out: 413 mutex_unlock(&vq->mutex); 414 } 415 416 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 417 { 418 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 419 poll.work); 420 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 421 dev); 422 423 vhost_transport_do_send_pkt(vsock, vq); 424 } 425 426 static int vhost_vsock_start(struct vhost_vsock *vsock) 427 { 428 struct vhost_virtqueue *vq; 429 size_t i; 430 int ret; 431 432 mutex_lock(&vsock->dev.mutex); 433 434 ret = vhost_dev_check_owner(&vsock->dev); 435 if (ret) 436 goto err; 437 438 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 439 vq = &vsock->vqs[i]; 440 441 mutex_lock(&vq->mutex); 442 443 if (!vhost_vq_access_ok(vq)) { 444 ret = -EFAULT; 445 goto err_vq; 446 } 447 448 if (!vq->private_data) { 449 vq->private_data = vsock; 450 ret = vhost_vq_init_access(vq); 451 if (ret) 452 goto err_vq; 453 } 454 455 mutex_unlock(&vq->mutex); 456 } 457 458 mutex_unlock(&vsock->dev.mutex); 459 return 0; 460 461 err_vq: 462 vq->private_data = NULL; 463 mutex_unlock(&vq->mutex); 464 465 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 466 vq = &vsock->vqs[i]; 467 468 mutex_lock(&vq->mutex); 469 vq->private_data = NULL; 470 mutex_unlock(&vq->mutex); 471 } 472 err: 473 mutex_unlock(&vsock->dev.mutex); 474 return ret; 475 } 476 477 static int vhost_vsock_stop(struct vhost_vsock *vsock) 478 { 479 size_t i; 480 int ret; 481 482 mutex_lock(&vsock->dev.mutex); 483 484 ret = vhost_dev_check_owner(&vsock->dev); 485 if (ret) 486 goto err; 487 488 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 489 struct vhost_virtqueue *vq = &vsock->vqs[i]; 490 491 mutex_lock(&vq->mutex); 492 vq->private_data = NULL; 493 mutex_unlock(&vq->mutex); 494 } 495 496 err: 497 mutex_unlock(&vsock->dev.mutex); 498 return ret; 499 } 500 501 static void vhost_vsock_free(struct vhost_vsock *vsock) 502 { 503 kvfree(vsock); 504 } 505 506 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 507 { 508 struct vhost_virtqueue **vqs; 509 struct vhost_vsock *vsock; 510 int ret; 511 512 /* This struct is large and allocation could fail, fall back to vmalloc 513 * if there is no other way. 514 */ 515 vsock = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL); 516 if (!vsock) 517 return -ENOMEM; 518 519 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 520 if (!vqs) { 521 ret = -ENOMEM; 522 goto out; 523 } 524 525 vsock->guest_cid = 0; /* no CID assigned yet */ 526 527 atomic_set(&vsock->queued_replies, 0); 528 529 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 530 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 531 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 532 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 533 534 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs), UIO_MAXIOV); 535 536 file->private_data = vsock; 537 spin_lock_init(&vsock->send_pkt_list_lock); 538 INIT_LIST_HEAD(&vsock->send_pkt_list); 539 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 540 return 0; 541 542 out: 543 vhost_vsock_free(vsock); 544 return ret; 545 } 546 547 static void vhost_vsock_flush(struct vhost_vsock *vsock) 548 { 549 int i; 550 551 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 552 if (vsock->vqs[i].handle_kick) 553 vhost_poll_flush(&vsock->vqs[i].poll); 554 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 555 } 556 557 static void vhost_vsock_reset_orphans(struct sock *sk) 558 { 559 struct vsock_sock *vsk = vsock_sk(sk); 560 561 /* vmci_transport.c doesn't take sk_lock here either. At least we're 562 * under vsock_table_lock so the sock cannot disappear while we're 563 * executing. 564 */ 565 566 /* If the peer is still valid, no need to reset connection */ 567 if (vhost_vsock_get(vsk->remote_addr.svm_cid)) 568 return; 569 570 /* If the close timeout is pending, let it expire. This avoids races 571 * with the timeout callback. 572 */ 573 if (vsk->close_work_scheduled) 574 return; 575 576 sock_set_flag(sk, SOCK_DONE); 577 vsk->peer_shutdown = SHUTDOWN_MASK; 578 sk->sk_state = SS_UNCONNECTED; 579 sk->sk_err = ECONNRESET; 580 sk->sk_error_report(sk); 581 } 582 583 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 584 { 585 struct vhost_vsock *vsock = file->private_data; 586 587 mutex_lock(&vhost_vsock_mutex); 588 if (vsock->guest_cid) 589 hash_del_rcu(&vsock->hash); 590 mutex_unlock(&vhost_vsock_mutex); 591 592 /* Wait for other CPUs to finish using vsock */ 593 synchronize_rcu(); 594 595 /* Iterating over all connections for all CIDs to find orphans is 596 * inefficient. Room for improvement here. */ 597 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 598 599 vhost_vsock_stop(vsock); 600 vhost_vsock_flush(vsock); 601 vhost_dev_stop(&vsock->dev); 602 603 spin_lock_bh(&vsock->send_pkt_list_lock); 604 while (!list_empty(&vsock->send_pkt_list)) { 605 struct virtio_vsock_pkt *pkt; 606 607 pkt = list_first_entry(&vsock->send_pkt_list, 608 struct virtio_vsock_pkt, list); 609 list_del_init(&pkt->list); 610 virtio_transport_free_pkt(pkt); 611 } 612 spin_unlock_bh(&vsock->send_pkt_list_lock); 613 614 vhost_dev_cleanup(&vsock->dev); 615 kfree(vsock->dev.vqs); 616 vhost_vsock_free(vsock); 617 return 0; 618 } 619 620 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 621 { 622 struct vhost_vsock *other; 623 624 /* Refuse reserved CIDs */ 625 if (guest_cid <= VMADDR_CID_HOST || 626 guest_cid == U32_MAX) 627 return -EINVAL; 628 629 /* 64-bit CIDs are not yet supported */ 630 if (guest_cid > U32_MAX) 631 return -EINVAL; 632 633 /* Refuse if CID is already in use */ 634 mutex_lock(&vhost_vsock_mutex); 635 other = vhost_vsock_get(guest_cid); 636 if (other && other != vsock) { 637 mutex_unlock(&vhost_vsock_mutex); 638 return -EADDRINUSE; 639 } 640 641 if (vsock->guest_cid) 642 hash_del_rcu(&vsock->hash); 643 644 vsock->guest_cid = guest_cid; 645 hash_add_rcu(vhost_vsock_hash, &vsock->hash, vsock->guest_cid); 646 mutex_unlock(&vhost_vsock_mutex); 647 648 return 0; 649 } 650 651 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 652 { 653 struct vhost_virtqueue *vq; 654 int i; 655 656 if (features & ~VHOST_VSOCK_FEATURES) 657 return -EOPNOTSUPP; 658 659 mutex_lock(&vsock->dev.mutex); 660 if ((features & (1 << VHOST_F_LOG_ALL)) && 661 !vhost_log_access_ok(&vsock->dev)) { 662 mutex_unlock(&vsock->dev.mutex); 663 return -EFAULT; 664 } 665 666 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 667 vq = &vsock->vqs[i]; 668 mutex_lock(&vq->mutex); 669 vq->acked_features = features; 670 mutex_unlock(&vq->mutex); 671 } 672 mutex_unlock(&vsock->dev.mutex); 673 return 0; 674 } 675 676 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 677 unsigned long arg) 678 { 679 struct vhost_vsock *vsock = f->private_data; 680 void __user *argp = (void __user *)arg; 681 u64 guest_cid; 682 u64 features; 683 int start; 684 int r; 685 686 switch (ioctl) { 687 case VHOST_VSOCK_SET_GUEST_CID: 688 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 689 return -EFAULT; 690 return vhost_vsock_set_cid(vsock, guest_cid); 691 case VHOST_VSOCK_SET_RUNNING: 692 if (copy_from_user(&start, argp, sizeof(start))) 693 return -EFAULT; 694 if (start) 695 return vhost_vsock_start(vsock); 696 else 697 return vhost_vsock_stop(vsock); 698 case VHOST_GET_FEATURES: 699 features = VHOST_VSOCK_FEATURES; 700 if (copy_to_user(argp, &features, sizeof(features))) 701 return -EFAULT; 702 return 0; 703 case VHOST_SET_FEATURES: 704 if (copy_from_user(&features, argp, sizeof(features))) 705 return -EFAULT; 706 return vhost_vsock_set_features(vsock, features); 707 default: 708 mutex_lock(&vsock->dev.mutex); 709 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 710 if (r == -ENOIOCTLCMD) 711 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 712 else 713 vhost_vsock_flush(vsock); 714 mutex_unlock(&vsock->dev.mutex); 715 return r; 716 } 717 } 718 719 #ifdef CONFIG_COMPAT 720 static long vhost_vsock_dev_compat_ioctl(struct file *f, unsigned int ioctl, 721 unsigned long arg) 722 { 723 return vhost_vsock_dev_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); 724 } 725 #endif 726 727 static const struct file_operations vhost_vsock_fops = { 728 .owner = THIS_MODULE, 729 .open = vhost_vsock_dev_open, 730 .release = vhost_vsock_dev_release, 731 .llseek = noop_llseek, 732 .unlocked_ioctl = vhost_vsock_dev_ioctl, 733 #ifdef CONFIG_COMPAT 734 .compat_ioctl = vhost_vsock_dev_compat_ioctl, 735 #endif 736 }; 737 738 static struct miscdevice vhost_vsock_misc = { 739 .minor = VHOST_VSOCK_MINOR, 740 .name = "vhost-vsock", 741 .fops = &vhost_vsock_fops, 742 }; 743 744 static struct virtio_transport vhost_transport = { 745 .transport = { 746 .get_local_cid = vhost_transport_get_local_cid, 747 748 .init = virtio_transport_do_socket_init, 749 .destruct = virtio_transport_destruct, 750 .release = virtio_transport_release, 751 .connect = virtio_transport_connect, 752 .shutdown = virtio_transport_shutdown, 753 .cancel_pkt = vhost_transport_cancel_pkt, 754 755 .dgram_enqueue = virtio_transport_dgram_enqueue, 756 .dgram_dequeue = virtio_transport_dgram_dequeue, 757 .dgram_bind = virtio_transport_dgram_bind, 758 .dgram_allow = virtio_transport_dgram_allow, 759 760 .stream_enqueue = virtio_transport_stream_enqueue, 761 .stream_dequeue = virtio_transport_stream_dequeue, 762 .stream_has_data = virtio_transport_stream_has_data, 763 .stream_has_space = virtio_transport_stream_has_space, 764 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 765 .stream_is_active = virtio_transport_stream_is_active, 766 .stream_allow = virtio_transport_stream_allow, 767 768 .notify_poll_in = virtio_transport_notify_poll_in, 769 .notify_poll_out = virtio_transport_notify_poll_out, 770 .notify_recv_init = virtio_transport_notify_recv_init, 771 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 772 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 773 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 774 .notify_send_init = virtio_transport_notify_send_init, 775 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 776 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 777 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 778 779 .set_buffer_size = virtio_transport_set_buffer_size, 780 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 781 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 782 .get_buffer_size = virtio_transport_get_buffer_size, 783 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 784 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 785 }, 786 787 .send_pkt = vhost_transport_send_pkt, 788 }; 789 790 static int __init vhost_vsock_init(void) 791 { 792 int ret; 793 794 ret = vsock_core_init(&vhost_transport.transport); 795 if (ret < 0) 796 return ret; 797 return misc_register(&vhost_vsock_misc); 798 }; 799 800 static void __exit vhost_vsock_exit(void) 801 { 802 misc_deregister(&vhost_vsock_misc); 803 vsock_core_exit(); 804 }; 805 806 module_init(vhost_vsock_init); 807 module_exit(vhost_vsock_exit); 808 MODULE_LICENSE("GPL v2"); 809 MODULE_AUTHOR("Asias He"); 810 MODULE_DESCRIPTION("vhost transport for vsock "); 811 MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR); 812 MODULE_ALIAS("devname:vhost-vsock"); 813