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                 u32 len;
 311
 312                 if (!vhost_vsock_more_replies(vsock)) {
 313                         /* Stop tx until the device processes already
 314                          * pending replies.  Leave tx virtqueue
 315                          * callbacks disabled.
 316                          */
 317                         goto no_more_replies;
 318                 }
 319
 320                 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
 321                                          &out, &in, NULL, NULL);
 322                 if (head < 0)
 323                         break;
 324
 325                 if (head == vq->num) {
 326                         if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
 327                                 vhost_disable_notify(&vsock->dev, vq);
 328                                 continue;
 329                         }
 330                         break;
 331                 }
 332
 333                 pkt = vhost_vsock_alloc_pkt(vq, out, in);
 334                 if (!pkt) {
 335                         vq_err(vq, "Faulted on pkt\n");
 336                         continue;
 337                 }
 338
 339                 len = pkt->len;
 340
 341                 /* Only accept correctly addressed packets */
 342                 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid)
 343                         virtio_transport_recv_pkt(pkt);
 344                 else
 345                         virtio_transport_free_pkt(pkt);
 346
 347                 vhost_add_used(vq, head, sizeof(pkt->hdr) + len);
 348                 added = true;
 349         }
 350
 351 no_more_replies:
 352         if (added)
 353                 vhost_signal(&vsock->dev, vq);
 354
 355 out:
 356         mutex_unlock(&vq->mutex);
 357 }
 358
 359 static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
 360 {
 361         struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
 362                                                 poll.work);
 363         struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
 364                                                  dev);
 365
 366         vhost_transport_do_send_pkt(vsock, vq);
 367 }
 368
 369 static int vhost_vsock_start(struct vhost_vsock *vsock)
 370 {
 371         struct vhost_virtqueue *vq;
 372         size_t i;
 373         int ret;
 374
 375         mutex_lock(&vsock->dev.mutex);
 376
 377         ret = vhost_dev_check_owner(&vsock->dev);
 378         if (ret)
 379                 goto err;
 380
 381         for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
 382                 vq = &vsock->vqs[i];
 383
 384                 mutex_lock(&vq->mutex);
 385
 386                 if (!vhost_vq_access_ok(vq)) {
 387                         ret = -EFAULT;
 388                         goto err_vq;
 389                 }
 390
 391                 if (!vq->private_data) {
 392                         vq->private_data = vsock;
 393                         ret = vhost_vq_init_access(vq);
 394                         if (ret)
 395                                 goto err_vq;
 396                 }
 397
 398                 mutex_unlock(&vq->mutex);
 399         }
 400
 401         mutex_unlock(&vsock->dev.mutex);
 402         return 0;
 403
 404 err_vq:
 405         vq->private_data = NULL;
 406         mutex_unlock(&vq->mutex);
 407
 408         for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
 409                 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         other = vhost_vsock_get(guest_cid);
 571         if (other && other != vsock)
 572                 return -EADDRINUSE;
 573
 574         spin_lock_bh(&vhost_vsock_lock);
 575         vsock->guest_cid = guest_cid;
 576         spin_unlock_bh(&vhost_vsock_lock);
 577
 578         return 0;
 579 }
 580
 581 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
 582 {
 583         struct vhost_virtqueue *vq;
 584         int i;
 585
 586         if (features & ~VHOST_VSOCK_FEATURES)
 587                 return -EOPNOTSUPP;
 588
 589         mutex_lock(&vsock->dev.mutex);
 590         if ((features & (1 << VHOST_F_LOG_ALL)) &&
 591             !vhost_log_access_ok(&vsock->dev)) {
 592                 mutex_unlock(&vsock->dev.mutex);
 593                 return -EFAULT;
 594         }
 595
 596         for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
 597                 vq = &vsock->vqs[i];
 598                 mutex_lock(&vq->mutex);
 599                 vq->acked_features = features;
 600                 mutex_unlock(&vq->mutex);
 601         }
 602         mutex_unlock(&vsock->dev.mutex);
 603         return 0;
 604 }
 605
 606 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
 607                                   unsigned long arg)
 608 {
 609         struct vhost_vsock *vsock = f->private_data;
 610         void __user *argp = (void __user *)arg;
 611         u64 guest_cid;
 612         u64 features;
 613         int start;
 614         int r;
 615
 616         switch (ioctl) {
 617         case VHOST_VSOCK_SET_GUEST_CID:
 618                 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid)))
 619                         return -EFAULT;
 620                 return vhost_vsock_set_cid(vsock, guest_cid);
 621         case VHOST_VSOCK_SET_RUNNING:
 622                 if (copy_from_user(&start, argp, sizeof(start)))
 623                         return -EFAULT;
 624                 if (start)
 625                         return vhost_vsock_start(vsock);
 626                 else
 627                         return vhost_vsock_stop(vsock);
 628         case VHOST_GET_FEATURES:
 629                 features = VHOST_VSOCK_FEATURES;
 630                 if (copy_to_user(argp, &features, sizeof(features)))
 631                         return -EFAULT;
 632                 return 0;
 633         case VHOST_SET_FEATURES:
 634                 if (copy_from_user(&features, argp, sizeof(features)))
 635                         return -EFAULT;
 636                 return vhost_vsock_set_features(vsock, features);
 637         default:
 638                 mutex_lock(&vsock->dev.mutex);
 639                 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
 640                 if (r == -ENOIOCTLCMD)
 641                         r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
 642                 else
 643                         vhost_vsock_flush(vsock);
 644                 mutex_unlock(&vsock->dev.mutex);
 645                 return r;
 646         }
 647 }
 648
 649 static const struct file_operations vhost_vsock_fops = {
 650         .owner          = THIS_MODULE,
 651         .open           = vhost_vsock_dev_open,
 652         .release        = vhost_vsock_dev_release,
 653         .llseek         = noop_llseek,
 654         .unlocked_ioctl = vhost_vsock_dev_ioctl,
 655 };
 656
 657 static struct miscdevice vhost_vsock_misc = {
 658         .minor = MISC_DYNAMIC_MINOR,
 659         .name = "vhost-vsock",
 660         .fops = &vhost_vsock_fops,
 661 };
 662
 663 static struct virtio_transport vhost_transport = {
 664         .transport = {
 665                 .get_local_cid            = vhost_transport_get_local_cid,
 666
 667                 .init                     = virtio_transport_do_socket_init,
 668                 .destruct                 = virtio_transport_destruct,
 669                 .release                  = virtio_transport_release,
 670                 .connect                  = virtio_transport_connect,
 671                 .shutdown                 = virtio_transport_shutdown,
 672
 673                 .dgram_enqueue            = virtio_transport_dgram_enqueue,
 674                 .dgram_dequeue            = virtio_transport_dgram_dequeue,
 675                 .dgram_bind               = virtio_transport_dgram_bind,
 676                 .dgram_allow              = virtio_transport_dgram_allow,
 677
 678                 .stream_enqueue           = virtio_transport_stream_enqueue,
 679                 .stream_dequeue           = virtio_transport_stream_dequeue,
 680                 .stream_has_data          = virtio_transport_stream_has_data,
 681                 .stream_has_space         = virtio_transport_stream_has_space,
 682                 .stream_rcvhiwat          = virtio_transport_stream_rcvhiwat,
 683                 .stream_is_active         = virtio_transport_stream_is_active,
 684                 .stream_allow             = virtio_transport_stream_allow,
 685
 686                 .notify_poll_in           = virtio_transport_notify_poll_in,
 687                 .notify_poll_out          = virtio_transport_notify_poll_out,
 688                 .notify_recv_init         = virtio_transport_notify_recv_init,
 689                 .notify_recv_pre_block    = virtio_transport_notify_recv_pre_block,
 690                 .notify_recv_pre_dequeue  = virtio_transport_notify_recv_pre_dequeue,
 691                 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
 692                 .notify_send_init         = virtio_transport_notify_send_init,
 693                 .notify_send_pre_block    = virtio_transport_notify_send_pre_block,
 694                 .notify_send_pre_enqueue  = virtio_transport_notify_send_pre_enqueue,
 695                 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
 696
 697                 .set_buffer_size          = virtio_transport_set_buffer_size,
 698                 .set_min_buffer_size      = virtio_transport_set_min_buffer_size,
 699                 .set_max_buffer_size      = virtio_transport_set_max_buffer_size,
 700                 .get_buffer_size          = virtio_transport_get_buffer_size,
 701                 .get_min_buffer_size      = virtio_transport_get_min_buffer_size,
 702                 .get_max_buffer_size      = virtio_transport_get_max_buffer_size,
 703         },
 704
 705         .send_pkt = vhost_transport_send_pkt,
 706 };
 707
 708 static int __init vhost_vsock_init(void)
 709 {
 710         int ret;
 711
 712         ret = vsock_core_init(&vhost_transport.transport);
 713         if (ret < 0)
 714                 return ret;
 715         return misc_register(&vhost_vsock_misc);
 716 };
 717
 718 static void __exit vhost_vsock_exit(void)
 719 {
 720         misc_deregister(&vhost_vsock_misc);
 721         vsock_core_exit();
 722 };
 723
 724 module_init(vhost_vsock_init);
 725 module_exit(vhost_vsock_exit);
 726 MODULE_LICENSE("GPL v2");
 727 MODULE_AUTHOR("Asias He");
 728 MODULE_DESCRIPTION("vhost transport for vsock ");