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 /* Max number of bytes transferred before requeueing the job. 25 * Using this limit prevents one virtqueue from starving others. */ 26 #define VHOST_VSOCK_WEIGHT 0x80000 27 /* Max number of packets transferred before requeueing the job. 28 * Using this limit prevents one virtqueue from starving others with 29 * small pkts. 30 */ 31 #define VHOST_VSOCK_PKT_WEIGHT 256 32 33 enum { 34 VHOST_VSOCK_FEATURES = VHOST_FEATURES, 35 }; 36 37 /* Used to track all the vhost_vsock instances on the system. */ 38 static DEFINE_MUTEX(vhost_vsock_mutex); 39 static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8); 40 41 struct vhost_vsock { 42 struct vhost_dev dev; 43 struct vhost_virtqueue vqs[2]; 44 45 /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */ 46 struct hlist_node hash; 47 48 struct vhost_work send_pkt_work; 49 spinlock_t send_pkt_list_lock; 50 struct list_head send_pkt_list; /* host->guest pending packets */ 51 52 atomic_t queued_replies; 53 54 u32 guest_cid; 55 }; 56 57 static u32 vhost_transport_get_local_cid(void) 58 { 59 return VHOST_VSOCK_DEFAULT_HOST_CID; 60 } 61 62 /* Callers that dereference the return value must hold vhost_vsock_mutex or the 63 * RCU read lock. 64 */ 65 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid) 66 { 67 struct vhost_vsock *vsock; 68 69 hash_for_each_possible_rcu(vhost_vsock_hash, vsock, hash, guest_cid) { 70 u32 other_cid = vsock->guest_cid; 71 72 /* Skip instances that have no CID yet */ 73 if (other_cid == 0) 74 continue; 75 76 if (other_cid == guest_cid) 77 return vsock; 78 79 } 80 81 return NULL; 82 } 83 84 static void 85 vhost_transport_do_send_pkt(struct vhost_vsock *vsock, 86 struct vhost_virtqueue *vq) 87 { 88 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 89 int pkts = 0, total_len = 0; 90 bool added = false; 91 bool restart_tx = false; 92 93 mutex_lock(&vq->mutex); 94 95 if (!vq->private_data) 96 goto out; 97 98 /* Avoid further vmexits, we're already processing the virtqueue */ 99 vhost_disable_notify(&vsock->dev, vq); 100 101 do { 102 struct virtio_vsock_pkt *pkt; 103 struct iov_iter iov_iter; 104 unsigned out, in; 105 size_t nbytes; 106 size_t len; 107 int head; 108 109 spin_lock_bh(&vsock->send_pkt_list_lock); 110 if (list_empty(&vsock->send_pkt_list)) { 111 spin_unlock_bh(&vsock->send_pkt_list_lock); 112 vhost_enable_notify(&vsock->dev, vq); 113 break; 114 } 115 116 pkt = list_first_entry(&vsock->send_pkt_list, 117 struct virtio_vsock_pkt, list); 118 list_del_init(&pkt->list); 119 spin_unlock_bh(&vsock->send_pkt_list_lock); 120 121 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 122 &out, &in, NULL, NULL); 123 if (head < 0) { 124 spin_lock_bh(&vsock->send_pkt_list_lock); 125 list_add(&pkt->list, &vsock->send_pkt_list); 126 spin_unlock_bh(&vsock->send_pkt_list_lock); 127 break; 128 } 129 130 if (head == vq->num) { 131 spin_lock_bh(&vsock->send_pkt_list_lock); 132 list_add(&pkt->list, &vsock->send_pkt_list); 133 spin_unlock_bh(&vsock->send_pkt_list_lock); 134 135 /* We cannot finish yet if more buffers snuck in while 136 * re-enabling notify. 137 */ 138 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 139 vhost_disable_notify(&vsock->dev, vq); 140 continue; 141 } 142 break; 143 } 144 145 if (out) { 146 virtio_transport_free_pkt(pkt); 147 vq_err(vq, "Expected 0 output buffers, got %u\n", out); 148 break; 149 } 150 151 len = iov_length(&vq->iov[out], in); 152 iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len); 153 154 nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 155 if (nbytes != sizeof(pkt->hdr)) { 156 virtio_transport_free_pkt(pkt); 157 vq_err(vq, "Faulted on copying pkt hdr\n"); 158 break; 159 } 160 161 nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter); 162 if (nbytes != pkt->len) { 163 virtio_transport_free_pkt(pkt); 164 vq_err(vq, "Faulted on copying pkt buf\n"); 165 break; 166 } 167 168 vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len); 169 added = true; 170 171 if (pkt->reply) { 172 int val; 173 174 val = atomic_dec_return(&vsock->queued_replies); 175 176 /* Do we have resources to resume tx processing? */ 177 if (val + 1 == tx_vq->num) 178 restart_tx = true; 179 } 180 181 /* Deliver to monitoring devices all correctly transmitted 182 * packets. 183 */ 184 virtio_transport_deliver_tap_pkt(pkt); 185 186 total_len += pkt->len; 187 virtio_transport_free_pkt(pkt); 188 } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); 189 if (added) 190 vhost_signal(&vsock->dev, vq); 191 192 out: 193 mutex_unlock(&vq->mutex); 194 195 if (restart_tx) 196 vhost_poll_queue(&tx_vq->poll); 197 } 198 199 static void vhost_transport_send_pkt_work(struct vhost_work *work) 200 { 201 struct vhost_virtqueue *vq; 202 struct vhost_vsock *vsock; 203 204 vsock = container_of(work, struct vhost_vsock, send_pkt_work); 205 vq = &vsock->vqs[VSOCK_VQ_RX]; 206 207 vhost_transport_do_send_pkt(vsock, vq); 208 } 209 210 static int 211 vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt) 212 { 213 struct vhost_vsock *vsock; 214 int len = pkt->len; 215 216 rcu_read_lock(); 217 218 /* Find the vhost_vsock according to guest context id */ 219 vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid)); 220 if (!vsock) { 221 rcu_read_unlock(); 222 virtio_transport_free_pkt(pkt); 223 return -ENODEV; 224 } 225 226 if (pkt->reply) 227 atomic_inc(&vsock->queued_replies); 228 229 spin_lock_bh(&vsock->send_pkt_list_lock); 230 list_add_tail(&pkt->list, &vsock->send_pkt_list); 231 spin_unlock_bh(&vsock->send_pkt_list_lock); 232 233 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work); 234 235 rcu_read_unlock(); 236 return len; 237 } 238 239 static int 240 vhost_transport_cancel_pkt(struct vsock_sock *vsk) 241 { 242 struct vhost_vsock *vsock; 243 struct virtio_vsock_pkt *pkt, *n; 244 int cnt = 0; 245 int ret = -ENODEV; 246 LIST_HEAD(freeme); 247 248 rcu_read_lock(); 249 250 /* Find the vhost_vsock according to guest context id */ 251 vsock = vhost_vsock_get(vsk->remote_addr.svm_cid); 252 if (!vsock) 253 goto out; 254 255 spin_lock_bh(&vsock->send_pkt_list_lock); 256 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) { 257 if (pkt->vsk != vsk) 258 continue; 259 list_move(&pkt->list, &freeme); 260 } 261 spin_unlock_bh(&vsock->send_pkt_list_lock); 262 263 list_for_each_entry_safe(pkt, n, &freeme, list) { 264 if (pkt->reply) 265 cnt++; 266 list_del(&pkt->list); 267 virtio_transport_free_pkt(pkt); 268 } 269 270 if (cnt) { 271 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX]; 272 int new_cnt; 273 274 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies); 275 if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num) 276 vhost_poll_queue(&tx_vq->poll); 277 } 278 279 ret = 0; 280 out: 281 rcu_read_unlock(); 282 return ret; 283 } 284 285 static struct virtio_vsock_pkt * 286 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq, 287 unsigned int out, unsigned int in) 288 { 289 struct virtio_vsock_pkt *pkt; 290 struct iov_iter iov_iter; 291 size_t nbytes; 292 size_t len; 293 294 if (in != 0) { 295 vq_err(vq, "Expected 0 input buffers, got %u\n", in); 296 return NULL; 297 } 298 299 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL); 300 if (!pkt) 301 return NULL; 302 303 len = iov_length(vq->iov, out); 304 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len); 305 306 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter); 307 if (nbytes != sizeof(pkt->hdr)) { 308 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n", 309 sizeof(pkt->hdr), nbytes); 310 kfree(pkt); 311 return NULL; 312 } 313 314 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM) 315 pkt->len = le32_to_cpu(pkt->hdr.len); 316 317 /* No payload */ 318 if (!pkt->len) 319 return pkt; 320 321 /* The pkt is too big */ 322 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) { 323 kfree(pkt); 324 return NULL; 325 } 326 327 pkt->buf = kmalloc(pkt->len, GFP_KERNEL); 328 if (!pkt->buf) { 329 kfree(pkt); 330 return NULL; 331 } 332 333 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter); 334 if (nbytes != pkt->len) { 335 vq_err(vq, "Expected %u byte payload, got %zu bytes\n", 336 pkt->len, nbytes); 337 virtio_transport_free_pkt(pkt); 338 return NULL; 339 } 340 341 return pkt; 342 } 343 344 /* Is there space left for replies to rx packets? */ 345 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock) 346 { 347 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX]; 348 int val; 349 350 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */ 351 val = atomic_read(&vsock->queued_replies); 352 353 return val < vq->num; 354 } 355 356 static void vhost_vsock_handle_tx_kick(struct vhost_work *work) 357 { 358 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 359 poll.work); 360 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 361 dev); 362 struct virtio_vsock_pkt *pkt; 363 int head, pkts = 0, total_len = 0; 364 unsigned int out, in; 365 bool added = false; 366 367 mutex_lock(&vq->mutex); 368 369 if (!vq->private_data) 370 goto out; 371 372 vhost_disable_notify(&vsock->dev, vq); 373 do { 374 u32 len; 375 376 if (!vhost_vsock_more_replies(vsock)) { 377 /* Stop tx until the device processes already 378 * pending replies. Leave tx virtqueue 379 * callbacks disabled. 380 */ 381 goto no_more_replies; 382 } 383 384 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), 385 &out, &in, NULL, NULL); 386 if (head < 0) 387 break; 388 389 if (head == vq->num) { 390 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { 391 vhost_disable_notify(&vsock->dev, vq); 392 continue; 393 } 394 break; 395 } 396 397 pkt = vhost_vsock_alloc_pkt(vq, out, in); 398 if (!pkt) { 399 vq_err(vq, "Faulted on pkt\n"); 400 continue; 401 } 402 403 len = pkt->len; 404 405 /* Deliver to monitoring devices all received packets */ 406 virtio_transport_deliver_tap_pkt(pkt); 407 408 /* Only accept correctly addressed packets */ 409 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid) 410 virtio_transport_recv_pkt(pkt); 411 else 412 virtio_transport_free_pkt(pkt); 413 414 len += sizeof(pkt->hdr); 415 vhost_add_used(vq, head, len); 416 total_len += len; 417 added = true; 418 } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); 419 420 no_more_replies: 421 if (added) 422 vhost_signal(&vsock->dev, vq); 423 424 out: 425 mutex_unlock(&vq->mutex); 426 } 427 428 static void vhost_vsock_handle_rx_kick(struct vhost_work *work) 429 { 430 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue, 431 poll.work); 432 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, 433 dev); 434 435 vhost_transport_do_send_pkt(vsock, vq); 436 } 437 438 static int vhost_vsock_start(struct vhost_vsock *vsock) 439 { 440 struct vhost_virtqueue *vq; 441 size_t i; 442 int ret; 443 444 mutex_lock(&vsock->dev.mutex); 445 446 ret = vhost_dev_check_owner(&vsock->dev); 447 if (ret) 448 goto err; 449 450 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 451 vq = &vsock->vqs[i]; 452 453 mutex_lock(&vq->mutex); 454 455 if (!vhost_vq_access_ok(vq)) { 456 ret = -EFAULT; 457 goto err_vq; 458 } 459 460 if (!vq->private_data) { 461 vq->private_data = vsock; 462 ret = vhost_vq_init_access(vq); 463 if (ret) 464 goto err_vq; 465 } 466 467 mutex_unlock(&vq->mutex); 468 } 469 470 mutex_unlock(&vsock->dev.mutex); 471 return 0; 472 473 err_vq: 474 vq->private_data = NULL; 475 mutex_unlock(&vq->mutex); 476 477 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 478 vq = &vsock->vqs[i]; 479 480 mutex_lock(&vq->mutex); 481 vq->private_data = NULL; 482 mutex_unlock(&vq->mutex); 483 } 484 err: 485 mutex_unlock(&vsock->dev.mutex); 486 return ret; 487 } 488 489 static int vhost_vsock_stop(struct vhost_vsock *vsock) 490 { 491 size_t i; 492 int ret; 493 494 mutex_lock(&vsock->dev.mutex); 495 496 ret = vhost_dev_check_owner(&vsock->dev); 497 if (ret) 498 goto err; 499 500 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 501 struct vhost_virtqueue *vq = &vsock->vqs[i]; 502 503 mutex_lock(&vq->mutex); 504 vq->private_data = NULL; 505 mutex_unlock(&vq->mutex); 506 } 507 508 err: 509 mutex_unlock(&vsock->dev.mutex); 510 return ret; 511 } 512 513 static void vhost_vsock_free(struct vhost_vsock *vsock) 514 { 515 kvfree(vsock); 516 } 517 518 static int vhost_vsock_dev_open(struct inode *inode, struct file *file) 519 { 520 struct vhost_virtqueue **vqs; 521 struct vhost_vsock *vsock; 522 int ret; 523 524 /* This struct is large and allocation could fail, fall back to vmalloc 525 * if there is no other way. 526 */ 527 vsock = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL); 528 if (!vsock) 529 return -ENOMEM; 530 531 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL); 532 if (!vqs) { 533 ret = -ENOMEM; 534 goto out; 535 } 536 537 vsock->guest_cid = 0; /* no CID assigned yet */ 538 539 atomic_set(&vsock->queued_replies, 0); 540 541 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX]; 542 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX]; 543 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick; 544 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick; 545 546 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs), 547 UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT, 548 VHOST_VSOCK_WEIGHT); 549 550 file->private_data = vsock; 551 spin_lock_init(&vsock->send_pkt_list_lock); 552 INIT_LIST_HEAD(&vsock->send_pkt_list); 553 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work); 554 return 0; 555 556 out: 557 vhost_vsock_free(vsock); 558 return ret; 559 } 560 561 static void vhost_vsock_flush(struct vhost_vsock *vsock) 562 { 563 int i; 564 565 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) 566 if (vsock->vqs[i].handle_kick) 567 vhost_poll_flush(&vsock->vqs[i].poll); 568 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work); 569 } 570 571 static void vhost_vsock_reset_orphans(struct sock *sk) 572 { 573 struct vsock_sock *vsk = vsock_sk(sk); 574 575 /* vmci_transport.c doesn't take sk_lock here either. At least we're 576 * under vsock_table_lock so the sock cannot disappear while we're 577 * executing. 578 */ 579 580 /* If the peer is still valid, no need to reset connection */ 581 if (vhost_vsock_get(vsk->remote_addr.svm_cid)) 582 return; 583 584 /* If the close timeout is pending, let it expire. This avoids races 585 * with the timeout callback. 586 */ 587 if (vsk->close_work_scheduled) 588 return; 589 590 sock_set_flag(sk, SOCK_DONE); 591 vsk->peer_shutdown = SHUTDOWN_MASK; 592 sk->sk_state = SS_UNCONNECTED; 593 sk->sk_err = ECONNRESET; 594 sk->sk_error_report(sk); 595 } 596 597 static int vhost_vsock_dev_release(struct inode *inode, struct file *file) 598 { 599 struct vhost_vsock *vsock = file->private_data; 600 601 mutex_lock(&vhost_vsock_mutex); 602 if (vsock->guest_cid) 603 hash_del_rcu(&vsock->hash); 604 mutex_unlock(&vhost_vsock_mutex); 605 606 /* Wait for other CPUs to finish using vsock */ 607 synchronize_rcu(); 608 609 /* Iterating over all connections for all CIDs to find orphans is 610 * inefficient. Room for improvement here. */ 611 vsock_for_each_connected_socket(vhost_vsock_reset_orphans); 612 613 vhost_vsock_stop(vsock); 614 vhost_vsock_flush(vsock); 615 vhost_dev_stop(&vsock->dev); 616 617 spin_lock_bh(&vsock->send_pkt_list_lock); 618 while (!list_empty(&vsock->send_pkt_list)) { 619 struct virtio_vsock_pkt *pkt; 620 621 pkt = list_first_entry(&vsock->send_pkt_list, 622 struct virtio_vsock_pkt, list); 623 list_del_init(&pkt->list); 624 virtio_transport_free_pkt(pkt); 625 } 626 spin_unlock_bh(&vsock->send_pkt_list_lock); 627 628 vhost_dev_cleanup(&vsock->dev); 629 kfree(vsock->dev.vqs); 630 vhost_vsock_free(vsock); 631 return 0; 632 } 633 634 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid) 635 { 636 struct vhost_vsock *other; 637 638 /* Refuse reserved CIDs */ 639 if (guest_cid <= VMADDR_CID_HOST || 640 guest_cid == U32_MAX) 641 return -EINVAL; 642 643 /* 64-bit CIDs are not yet supported */ 644 if (guest_cid > U32_MAX) 645 return -EINVAL; 646 647 /* Refuse if CID is already in use */ 648 mutex_lock(&vhost_vsock_mutex); 649 other = vhost_vsock_get(guest_cid); 650 if (other && other != vsock) { 651 mutex_unlock(&vhost_vsock_mutex); 652 return -EADDRINUSE; 653 } 654 655 if (vsock->guest_cid) 656 hash_del_rcu(&vsock->hash); 657 658 vsock->guest_cid = guest_cid; 659 hash_add_rcu(vhost_vsock_hash, &vsock->hash, vsock->guest_cid); 660 mutex_unlock(&vhost_vsock_mutex); 661 662 return 0; 663 } 664 665 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features) 666 { 667 struct vhost_virtqueue *vq; 668 int i; 669 670 if (features & ~VHOST_VSOCK_FEATURES) 671 return -EOPNOTSUPP; 672 673 mutex_lock(&vsock->dev.mutex); 674 if ((features & (1 << VHOST_F_LOG_ALL)) && 675 !vhost_log_access_ok(&vsock->dev)) { 676 mutex_unlock(&vsock->dev.mutex); 677 return -EFAULT; 678 } 679 680 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) { 681 vq = &vsock->vqs[i]; 682 mutex_lock(&vq->mutex); 683 vq->acked_features = features; 684 mutex_unlock(&vq->mutex); 685 } 686 mutex_unlock(&vsock->dev.mutex); 687 return 0; 688 } 689 690 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl, 691 unsigned long arg) 692 { 693 struct vhost_vsock *vsock = f->private_data; 694 void __user *argp = (void __user *)arg; 695 u64 guest_cid; 696 u64 features; 697 int start; 698 int r; 699 700 switch (ioctl) { 701 case VHOST_VSOCK_SET_GUEST_CID: 702 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid))) 703 return -EFAULT; 704 return vhost_vsock_set_cid(vsock, guest_cid); 705 case VHOST_VSOCK_SET_RUNNING: 706 if (copy_from_user(&start, argp, sizeof(start))) 707 return -EFAULT; 708 if (start) 709 return vhost_vsock_start(vsock); 710 else 711 return vhost_vsock_stop(vsock); 712 case VHOST_GET_FEATURES: 713 features = VHOST_VSOCK_FEATURES; 714 if (copy_to_user(argp, &features, sizeof(features))) 715 return -EFAULT; 716 return 0; 717 case VHOST_SET_FEATURES: 718 if (copy_from_user(&features, argp, sizeof(features))) 719 return -EFAULT; 720 return vhost_vsock_set_features(vsock, features); 721 default: 722 mutex_lock(&vsock->dev.mutex); 723 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp); 724 if (r == -ENOIOCTLCMD) 725 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp); 726 else 727 vhost_vsock_flush(vsock); 728 mutex_unlock(&vsock->dev.mutex); 729 return r; 730 } 731 } 732 733 #ifdef CONFIG_COMPAT 734 static long vhost_vsock_dev_compat_ioctl(struct file *f, unsigned int ioctl, 735 unsigned long arg) 736 { 737 return vhost_vsock_dev_ioctl(f, ioctl, (unsigned long)compat_ptr(arg)); 738 } 739 #endif 740 741 static const struct file_operations vhost_vsock_fops = { 742 .owner = THIS_MODULE, 743 .open = vhost_vsock_dev_open, 744 .release = vhost_vsock_dev_release, 745 .llseek = noop_llseek, 746 .unlocked_ioctl = vhost_vsock_dev_ioctl, 747 #ifdef CONFIG_COMPAT 748 .compat_ioctl = vhost_vsock_dev_compat_ioctl, 749 #endif 750 }; 751 752 static struct miscdevice vhost_vsock_misc = { 753 .minor = VHOST_VSOCK_MINOR, 754 .name = "vhost-vsock", 755 .fops = &vhost_vsock_fops, 756 }; 757 758 static struct virtio_transport vhost_transport = { 759 .transport = { 760 .get_local_cid = vhost_transport_get_local_cid, 761 762 .init = virtio_transport_do_socket_init, 763 .destruct = virtio_transport_destruct, 764 .release = virtio_transport_release, 765 .connect = virtio_transport_connect, 766 .shutdown = virtio_transport_shutdown, 767 .cancel_pkt = vhost_transport_cancel_pkt, 768 769 .dgram_enqueue = virtio_transport_dgram_enqueue, 770 .dgram_dequeue = virtio_transport_dgram_dequeue, 771 .dgram_bind = virtio_transport_dgram_bind, 772 .dgram_allow = virtio_transport_dgram_allow, 773 774 .stream_enqueue = virtio_transport_stream_enqueue, 775 .stream_dequeue = virtio_transport_stream_dequeue, 776 .stream_has_data = virtio_transport_stream_has_data, 777 .stream_has_space = virtio_transport_stream_has_space, 778 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat, 779 .stream_is_active = virtio_transport_stream_is_active, 780 .stream_allow = virtio_transport_stream_allow, 781 782 .notify_poll_in = virtio_transport_notify_poll_in, 783 .notify_poll_out = virtio_transport_notify_poll_out, 784 .notify_recv_init = virtio_transport_notify_recv_init, 785 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block, 786 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue, 787 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue, 788 .notify_send_init = virtio_transport_notify_send_init, 789 .notify_send_pre_block = virtio_transport_notify_send_pre_block, 790 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue, 791 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue, 792 793 .set_buffer_size = virtio_transport_set_buffer_size, 794 .set_min_buffer_size = virtio_transport_set_min_buffer_size, 795 .set_max_buffer_size = virtio_transport_set_max_buffer_size, 796 .get_buffer_size = virtio_transport_get_buffer_size, 797 .get_min_buffer_size = virtio_transport_get_min_buffer_size, 798 .get_max_buffer_size = virtio_transport_get_max_buffer_size, 799 }, 800 801 .send_pkt = vhost_transport_send_pkt, 802 }; 803 804 static int __init vhost_vsock_init(void) 805 { 806 int ret; 807 808 ret = vsock_core_init(&vhost_transport.transport); 809 if (ret < 0) 810 return ret; 811 return misc_register(&vhost_vsock_misc); 812 }; 813 814 static void __exit vhost_vsock_exit(void) 815 { 816 misc_deregister(&vhost_vsock_misc); 817 vsock_core_exit(); 818 }; 819 820 module_init(vhost_vsock_init); 821 module_exit(vhost_vsock_exit); 822 MODULE_LICENSE("GPL v2"); 823 MODULE_AUTHOR("Asias He"); 824 MODULE_DESCRIPTION("vhost transport for vsock "); 825 MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR); 826 MODULE_ALIAS("devname:vhost-vsock"); 827