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