1 // SPDX-License-Identifier: GPL-2.0-only
3 * vhost transport for vsock
5 * Copyright (C) 2013-2015 Red Hat, Inc.
6 * Author: Asias He <asias@redhat.com>
7 * Stefan Hajnoczi <stefanha@redhat.com>
9 #include <linux/miscdevice.h>
10 #include <linux/atomic.h>
11 #include <linux/module.h>
12 #include <linux/mutex.h>
13 #include <linux/vmalloc.h>
15 #include <linux/virtio_vsock.h>
16 #include <linux/vhost.h>
17 #include <linux/hashtable.h>
19 #include <net/af_vsock.h>
22 #define VHOST_VSOCK_DEFAULT_HOST_CID 2
23 /* Max number of bytes transferred before requeueing the job.
24 * Using this limit prevents one virtqueue from starving others. */
25 #define VHOST_VSOCK_WEIGHT 0x80000
26 /* Max number of packets transferred before requeueing the job.
27 * Using this limit prevents one virtqueue from starving others with
30 #define VHOST_VSOCK_PKT_WEIGHT 256
33 VHOST_VSOCK_FEATURES = VHOST_FEATURES,
36 /* Used to track all the vhost_vsock instances on the system. */
37 static DEFINE_MUTEX(vhost_vsock_mutex);
38 static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8);
42 struct vhost_virtqueue vqs[2];
44 /* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */
45 struct hlist_node hash;
47 struct vhost_work send_pkt_work;
48 spinlock_t send_pkt_list_lock;
49 struct list_head send_pkt_list; /* host->guest pending packets */
51 atomic_t queued_replies;
56 static u32 vhost_transport_get_local_cid(void)
58 return VHOST_VSOCK_DEFAULT_HOST_CID;
61 /* Callers that dereference the return value must hold vhost_vsock_mutex or the
64 static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
66 struct vhost_vsock *vsock;
68 hash_for_each_possible_rcu(vhost_vsock_hash, vsock, hash, guest_cid) {
69 u32 other_cid = vsock->guest_cid;
71 /* Skip instances that have no CID yet */
75 if (other_cid == guest_cid)
84 vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
85 struct vhost_virtqueue *vq)
87 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
88 int pkts = 0, total_len = 0;
90 bool restart_tx = false;
92 mutex_lock(&vq->mutex);
94 if (!vhost_vq_get_backend(vq))
97 /* Avoid further vmexits, we're already processing the virtqueue */
98 vhost_disable_notify(&vsock->dev, vq);
101 struct virtio_vsock_pkt *pkt;
102 struct iov_iter iov_iter;
105 size_t iov_len, payload_len;
108 spin_lock_bh(&vsock->send_pkt_list_lock);
109 if (list_empty(&vsock->send_pkt_list)) {
110 spin_unlock_bh(&vsock->send_pkt_list_lock);
111 vhost_enable_notify(&vsock->dev, vq);
115 pkt = list_first_entry(&vsock->send_pkt_list,
116 struct virtio_vsock_pkt, list);
117 list_del_init(&pkt->list);
118 spin_unlock_bh(&vsock->send_pkt_list_lock);
120 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
121 &out, &in, NULL, NULL);
123 spin_lock_bh(&vsock->send_pkt_list_lock);
124 list_add(&pkt->list, &vsock->send_pkt_list);
125 spin_unlock_bh(&vsock->send_pkt_list_lock);
129 if (head == vq->num) {
130 spin_lock_bh(&vsock->send_pkt_list_lock);
131 list_add(&pkt->list, &vsock->send_pkt_list);
132 spin_unlock_bh(&vsock->send_pkt_list_lock);
134 /* We cannot finish yet if more buffers snuck in while
135 * re-enabling notify.
137 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
138 vhost_disable_notify(&vsock->dev, vq);
145 virtio_transport_free_pkt(pkt);
146 vq_err(vq, "Expected 0 output buffers, got %u\n", out);
150 iov_len = iov_length(&vq->iov[out], in);
151 if (iov_len < sizeof(pkt->hdr)) {
152 virtio_transport_free_pkt(pkt);
153 vq_err(vq, "Buffer len [%zu] too small\n", iov_len);
157 iov_iter_init(&iov_iter, READ, &vq->iov[out], in, iov_len);
158 payload_len = pkt->len - pkt->off;
160 /* If the packet is greater than the space available in the
161 * buffer, we split it using multiple buffers.
163 if (payload_len > iov_len - sizeof(pkt->hdr))
164 payload_len = iov_len - sizeof(pkt->hdr);
166 /* Set the correct length in the header */
167 pkt->hdr.len = cpu_to_le32(payload_len);
169 nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
170 if (nbytes != sizeof(pkt->hdr)) {
171 virtio_transport_free_pkt(pkt);
172 vq_err(vq, "Faulted on copying pkt hdr\n");
176 nbytes = copy_to_iter(pkt->buf + pkt->off, payload_len,
178 if (nbytes != payload_len) {
179 virtio_transport_free_pkt(pkt);
180 vq_err(vq, "Faulted on copying pkt buf\n");
184 /* Deliver to monitoring devices all packets that we
187 virtio_transport_deliver_tap_pkt(pkt);
189 vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
192 pkt->off += payload_len;
193 total_len += payload_len;
195 /* If we didn't send all the payload we can requeue the packet
196 * to send it with the next available buffer.
198 if (pkt->off < pkt->len) {
199 /* We are queueing the same virtio_vsock_pkt to handle
200 * the remaining bytes, and we want to deliver it
201 * to monitoring devices in the next iteration.
203 pkt->tap_delivered = false;
205 spin_lock_bh(&vsock->send_pkt_list_lock);
206 list_add(&pkt->list, &vsock->send_pkt_list);
207 spin_unlock_bh(&vsock->send_pkt_list_lock);
212 val = atomic_dec_return(&vsock->queued_replies);
214 /* Do we have resources to resume tx
217 if (val + 1 == tx_vq->num)
221 virtio_transport_free_pkt(pkt);
223 } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
225 vhost_signal(&vsock->dev, vq);
228 mutex_unlock(&vq->mutex);
231 vhost_poll_queue(&tx_vq->poll);
234 static void vhost_transport_send_pkt_work(struct vhost_work *work)
236 struct vhost_virtqueue *vq;
237 struct vhost_vsock *vsock;
239 vsock = container_of(work, struct vhost_vsock, send_pkt_work);
240 vq = &vsock->vqs[VSOCK_VQ_RX];
242 vhost_transport_do_send_pkt(vsock, vq);
246 vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
248 struct vhost_vsock *vsock;
253 /* Find the vhost_vsock according to guest context id */
254 vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid));
257 virtio_transport_free_pkt(pkt);
262 atomic_inc(&vsock->queued_replies);
264 spin_lock_bh(&vsock->send_pkt_list_lock);
265 list_add_tail(&pkt->list, &vsock->send_pkt_list);
266 spin_unlock_bh(&vsock->send_pkt_list_lock);
268 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
275 vhost_transport_cancel_pkt(struct vsock_sock *vsk)
277 struct vhost_vsock *vsock;
278 struct virtio_vsock_pkt *pkt, *n;
285 /* Find the vhost_vsock according to guest context id */
286 vsock = vhost_vsock_get(vsk->remote_addr.svm_cid);
290 spin_lock_bh(&vsock->send_pkt_list_lock);
291 list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) {
294 list_move(&pkt->list, &freeme);
296 spin_unlock_bh(&vsock->send_pkt_list_lock);
298 list_for_each_entry_safe(pkt, n, &freeme, list) {
301 list_del(&pkt->list);
302 virtio_transport_free_pkt(pkt);
306 struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
309 new_cnt = atomic_sub_return(cnt, &vsock->queued_replies);
310 if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num)
311 vhost_poll_queue(&tx_vq->poll);
320 static struct virtio_vsock_pkt *
321 vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
322 unsigned int out, unsigned int in)
324 struct virtio_vsock_pkt *pkt;
325 struct iov_iter iov_iter;
330 vq_err(vq, "Expected 0 input buffers, got %u\n", in);
334 pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
338 len = iov_length(vq->iov, out);
339 iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
341 nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
342 if (nbytes != sizeof(pkt->hdr)) {
343 vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
344 sizeof(pkt->hdr), nbytes);
349 if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
350 pkt->len = le32_to_cpu(pkt->hdr.len);
356 /* The pkt is too big */
357 if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
362 pkt->buf = kvmalloc(pkt->len, GFP_KERNEL);
368 pkt->buf_len = pkt->len;
370 nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
371 if (nbytes != pkt->len) {
372 vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
374 virtio_transport_free_pkt(pkt);
381 /* Is there space left for replies to rx packets? */
382 static bool vhost_vsock_more_replies(struct vhost_vsock *vsock)
384 struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX];
387 smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
388 val = atomic_read(&vsock->queued_replies);
390 return val < vq->num;
393 static struct virtio_transport vhost_transport = {
395 .module = THIS_MODULE,
397 .get_local_cid = vhost_transport_get_local_cid,
399 .init = virtio_transport_do_socket_init,
400 .destruct = virtio_transport_destruct,
401 .release = virtio_transport_release,
402 .connect = virtio_transport_connect,
403 .shutdown = virtio_transport_shutdown,
404 .cancel_pkt = vhost_transport_cancel_pkt,
406 .dgram_enqueue = virtio_transport_dgram_enqueue,
407 .dgram_dequeue = virtio_transport_dgram_dequeue,
408 .dgram_bind = virtio_transport_dgram_bind,
409 .dgram_allow = virtio_transport_dgram_allow,
411 .stream_enqueue = virtio_transport_stream_enqueue,
412 .stream_dequeue = virtio_transport_stream_dequeue,
413 .stream_has_data = virtio_transport_stream_has_data,
414 .stream_has_space = virtio_transport_stream_has_space,
415 .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
416 .stream_is_active = virtio_transport_stream_is_active,
417 .stream_allow = virtio_transport_stream_allow,
419 .notify_poll_in = virtio_transport_notify_poll_in,
420 .notify_poll_out = virtio_transport_notify_poll_out,
421 .notify_recv_init = virtio_transport_notify_recv_init,
422 .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
423 .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
424 .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
425 .notify_send_init = virtio_transport_notify_send_init,
426 .notify_send_pre_block = virtio_transport_notify_send_pre_block,
427 .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
428 .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
429 .notify_buffer_size = virtio_transport_notify_buffer_size,
433 .send_pkt = vhost_transport_send_pkt,
436 static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
438 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
440 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
442 struct virtio_vsock_pkt *pkt;
443 int head, pkts = 0, total_len = 0;
444 unsigned int out, in;
447 mutex_lock(&vq->mutex);
449 if (!vhost_vq_get_backend(vq))
452 vhost_disable_notify(&vsock->dev, vq);
456 if (!vhost_vsock_more_replies(vsock)) {
457 /* Stop tx until the device processes already
458 * pending replies. Leave tx virtqueue
459 * callbacks disabled.
461 goto no_more_replies;
464 head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
465 &out, &in, NULL, NULL);
469 if (head == vq->num) {
470 if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
471 vhost_disable_notify(&vsock->dev, vq);
477 pkt = vhost_vsock_alloc_pkt(vq, out, in);
479 vq_err(vq, "Faulted on pkt\n");
485 /* Deliver to monitoring devices all received packets */
486 virtio_transport_deliver_tap_pkt(pkt);
488 /* Only accept correctly addressed packets */
489 if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
490 le64_to_cpu(pkt->hdr.dst_cid) ==
491 vhost_transport_get_local_cid())
492 virtio_transport_recv_pkt(&vhost_transport, pkt);
494 virtio_transport_free_pkt(pkt);
496 len += sizeof(pkt->hdr);
497 vhost_add_used(vq, head, 0);
500 } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
504 vhost_signal(&vsock->dev, vq);
507 mutex_unlock(&vq->mutex);
510 static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
512 struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
514 struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
517 vhost_transport_do_send_pkt(vsock, vq);
520 static int vhost_vsock_start(struct vhost_vsock *vsock)
522 struct vhost_virtqueue *vq;
526 mutex_lock(&vsock->dev.mutex);
528 ret = vhost_dev_check_owner(&vsock->dev);
532 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
535 mutex_lock(&vq->mutex);
537 if (!vhost_vq_access_ok(vq)) {
542 if (!vhost_vq_get_backend(vq)) {
543 vhost_vq_set_backend(vq, vsock);
544 ret = vhost_vq_init_access(vq);
549 mutex_unlock(&vq->mutex);
552 /* Some packets may have been queued before the device was started,
553 * let's kick the send worker to send them.
555 vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
557 mutex_unlock(&vsock->dev.mutex);
561 vhost_vq_set_backend(vq, NULL);
562 mutex_unlock(&vq->mutex);
564 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
567 mutex_lock(&vq->mutex);
568 vhost_vq_set_backend(vq, NULL);
569 mutex_unlock(&vq->mutex);
572 mutex_unlock(&vsock->dev.mutex);
576 static int vhost_vsock_stop(struct vhost_vsock *vsock, bool check_owner)
581 mutex_lock(&vsock->dev.mutex);
584 ret = vhost_dev_check_owner(&vsock->dev);
589 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
590 struct vhost_virtqueue *vq = &vsock->vqs[i];
592 mutex_lock(&vq->mutex);
593 vhost_vq_set_backend(vq, NULL);
594 mutex_unlock(&vq->mutex);
598 mutex_unlock(&vsock->dev.mutex);
602 static void vhost_vsock_free(struct vhost_vsock *vsock)
607 static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
609 struct vhost_virtqueue **vqs;
610 struct vhost_vsock *vsock;
613 /* This struct is large and allocation could fail, fall back to vmalloc
614 * if there is no other way.
616 vsock = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
620 vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL);
626 vsock->guest_cid = 0; /* no CID assigned yet */
628 atomic_set(&vsock->queued_replies, 0);
630 vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX];
631 vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX];
632 vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick;
633 vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick;
635 vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs),
636 UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT,
637 VHOST_VSOCK_WEIGHT, true, NULL);
639 file->private_data = vsock;
640 spin_lock_init(&vsock->send_pkt_list_lock);
641 INIT_LIST_HEAD(&vsock->send_pkt_list);
642 vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
646 vhost_vsock_free(vsock);
650 static void vhost_vsock_flush(struct vhost_vsock *vsock)
654 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++)
655 if (vsock->vqs[i].handle_kick)
656 vhost_poll_flush(&vsock->vqs[i].poll);
657 vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
660 static void vhost_vsock_reset_orphans(struct sock *sk)
662 struct vsock_sock *vsk = vsock_sk(sk);
664 /* vmci_transport.c doesn't take sk_lock here either. At least we're
665 * under vsock_table_lock so the sock cannot disappear while we're
669 /* If the peer is still valid, no need to reset connection */
670 if (vhost_vsock_get(vsk->remote_addr.svm_cid))
673 /* If the close timeout is pending, let it expire. This avoids races
674 * with the timeout callback.
676 if (vsk->close_work_scheduled)
679 sock_set_flag(sk, SOCK_DONE);
680 vsk->peer_shutdown = SHUTDOWN_MASK;
681 sk->sk_state = SS_UNCONNECTED;
682 sk->sk_err = ECONNRESET;
683 sk->sk_error_report(sk);
686 static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
688 struct vhost_vsock *vsock = file->private_data;
690 mutex_lock(&vhost_vsock_mutex);
691 if (vsock->guest_cid)
692 hash_del_rcu(&vsock->hash);
693 mutex_unlock(&vhost_vsock_mutex);
695 /* Wait for other CPUs to finish using vsock */
698 /* Iterating over all connections for all CIDs to find orphans is
699 * inefficient. Room for improvement here. */
700 vsock_for_each_connected_socket(&vhost_transport.transport,
701 vhost_vsock_reset_orphans);
703 /* Don't check the owner, because we are in the release path, so we
704 * need to stop the vsock device in any case.
705 * vhost_vsock_stop() can not fail in this case, so we don't need to
706 * check the return code.
708 vhost_vsock_stop(vsock, false);
709 vhost_vsock_flush(vsock);
710 vhost_dev_stop(&vsock->dev);
712 spin_lock_bh(&vsock->send_pkt_list_lock);
713 while (!list_empty(&vsock->send_pkt_list)) {
714 struct virtio_vsock_pkt *pkt;
716 pkt = list_first_entry(&vsock->send_pkt_list,
717 struct virtio_vsock_pkt, list);
718 list_del_init(&pkt->list);
719 virtio_transport_free_pkt(pkt);
721 spin_unlock_bh(&vsock->send_pkt_list_lock);
723 vhost_dev_cleanup(&vsock->dev);
724 kfree(vsock->dev.vqs);
725 vhost_vsock_free(vsock);
729 static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
731 struct vhost_vsock *other;
733 /* Refuse reserved CIDs */
734 if (guest_cid <= VMADDR_CID_HOST ||
735 guest_cid == U32_MAX)
738 /* 64-bit CIDs are not yet supported */
739 if (guest_cid > U32_MAX)
742 /* Refuse if CID is assigned to the guest->host transport (i.e. nested
743 * VM), to make the loopback work.
745 if (vsock_find_cid(guest_cid))
748 /* Refuse if CID is already in use */
749 mutex_lock(&vhost_vsock_mutex);
750 other = vhost_vsock_get(guest_cid);
751 if (other && other != vsock) {
752 mutex_unlock(&vhost_vsock_mutex);
756 if (vsock->guest_cid)
757 hash_del_rcu(&vsock->hash);
759 vsock->guest_cid = guest_cid;
760 hash_add_rcu(vhost_vsock_hash, &vsock->hash, vsock->guest_cid);
761 mutex_unlock(&vhost_vsock_mutex);
766 static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
768 struct vhost_virtqueue *vq;
771 if (features & ~VHOST_VSOCK_FEATURES)
774 mutex_lock(&vsock->dev.mutex);
775 if ((features & (1 << VHOST_F_LOG_ALL)) &&
776 !vhost_log_access_ok(&vsock->dev)) {
777 mutex_unlock(&vsock->dev.mutex);
781 for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
783 mutex_lock(&vq->mutex);
784 vq->acked_features = features;
785 mutex_unlock(&vq->mutex);
787 mutex_unlock(&vsock->dev.mutex);
791 static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
794 struct vhost_vsock *vsock = f->private_data;
795 void __user *argp = (void __user *)arg;
802 case VHOST_VSOCK_SET_GUEST_CID:
803 if (copy_from_user(&guest_cid, argp, sizeof(guest_cid)))
805 return vhost_vsock_set_cid(vsock, guest_cid);
806 case VHOST_VSOCK_SET_RUNNING:
807 if (copy_from_user(&start, argp, sizeof(start)))
810 return vhost_vsock_start(vsock);
812 return vhost_vsock_stop(vsock, true);
813 case VHOST_GET_FEATURES:
814 features = VHOST_VSOCK_FEATURES;
815 if (copy_to_user(argp, &features, sizeof(features)))
818 case VHOST_SET_FEATURES:
819 if (copy_from_user(&features, argp, sizeof(features)))
821 return vhost_vsock_set_features(vsock, features);
823 mutex_lock(&vsock->dev.mutex);
824 r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
825 if (r == -ENOIOCTLCMD)
826 r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
828 vhost_vsock_flush(vsock);
829 mutex_unlock(&vsock->dev.mutex);
834 static const struct file_operations vhost_vsock_fops = {
835 .owner = THIS_MODULE,
836 .open = vhost_vsock_dev_open,
837 .release = vhost_vsock_dev_release,
838 .llseek = noop_llseek,
839 .unlocked_ioctl = vhost_vsock_dev_ioctl,
840 .compat_ioctl = compat_ptr_ioctl,
843 static struct miscdevice vhost_vsock_misc = {
844 .minor = VHOST_VSOCK_MINOR,
845 .name = "vhost-vsock",
846 .fops = &vhost_vsock_fops,
849 static int __init vhost_vsock_init(void)
853 ret = vsock_core_register(&vhost_transport.transport,
854 VSOCK_TRANSPORT_F_H2G);
858 ret = misc_register(&vhost_vsock_misc);
860 vsock_core_unregister(&vhost_transport.transport);
867 static void __exit vhost_vsock_exit(void)
869 misc_deregister(&vhost_vsock_misc);
870 vsock_core_unregister(&vhost_transport.transport);
873 module_init(vhost_vsock_init);
874 module_exit(vhost_vsock_exit);
875 MODULE_LICENSE("GPL v2");
876 MODULE_AUTHOR("Asias He");
877 MODULE_DESCRIPTION("vhost transport for vsock ");
878 MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR);
879 MODULE_ALIAS("devname:vhost-vsock");