drivers/vhost/vsock.c

   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 ");