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-rw-r--r--drivers/vhost/vsock.c722
1 files changed, 722 insertions, 0 deletions
diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c
new file mode 100644
index 000000000000..028ca16c2d36
--- /dev/null
+++ b/drivers/vhost/vsock.c
@@ -0,0 +1,722 @@
+/*
+ * vhost transport for vsock
+ *
+ * Copyright (C) 2013-2015 Red Hat, Inc.
+ * Author: Asias He <asias@redhat.com>
+ * Stefan Hajnoczi <stefanha@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2.
+ */
+#include <linux/miscdevice.h>
+#include <linux/atomic.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/vmalloc.h>
+#include <net/sock.h>
+#include <linux/virtio_vsock.h>
+#include <linux/vhost.h>
+
+#include <net/af_vsock.h>
+#include "vhost.h"
+
+#define VHOST_VSOCK_DEFAULT_HOST_CID 2
+
+enum {
+ VHOST_VSOCK_FEATURES = VHOST_FEATURES,
+};
+
+/* Used to track all the vhost_vsock instances on the system. */
+static DEFINE_SPINLOCK(vhost_vsock_lock);
+static LIST_HEAD(vhost_vsock_list);
+
+struct vhost_vsock {
+ struct vhost_dev dev;
+ struct vhost_virtqueue vqs[2];
+
+ /* Link to global vhost_vsock_list, protected by vhost_vsock_lock */
+ struct list_head list;
+
+ struct vhost_work send_pkt_work;
+ spinlock_t send_pkt_list_lock;
+ struct list_head send_pkt_list; /* host->guest pending packets */
+
+ atomic_t queued_replies;
+
+ u32 guest_cid;
+};
+
+static u32 vhost_transport_get_local_cid(void)
+{
+ return VHOST_VSOCK_DEFAULT_HOST_CID;
+}
+
+static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
+{
+ struct vhost_vsock *vsock;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ list_for_each_entry(vsock, &vhost_vsock_list, list) {
+ u32 other_cid = vsock->guest_cid;
+
+ /* Skip instances that have no CID yet */
+ if (other_cid == 0)
+ continue;
+
+ if (other_cid == guest_cid) {
+ spin_unlock_bh(&vhost_vsock_lock);
+ return vsock;
+ }
+ }
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ return NULL;
+}
+
+static void
+vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
+ struct vhost_virtqueue *vq)
+{
+ struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
+ bool added = false;
+ bool restart_tx = false;
+
+ mutex_lock(&vq->mutex);
+
+ if (!vq->private_data)
+ goto out;
+
+ /* Avoid further vmexits, we're already processing the virtqueue */
+ vhost_disable_notify(&vsock->dev, vq);
+
+ for (;;) {
+ struct virtio_vsock_pkt *pkt;
+ struct iov_iter iov_iter;
+ unsigned out, in;
+ size_t nbytes;
+ size_t len;
+ int head;
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ if (list_empty(&vsock->send_pkt_list)) {
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+ vhost_enable_notify(&vsock->dev, vq);
+ break;
+ }
+
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del_init(&pkt->list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
+ &out, &in, NULL, NULL);
+ if (head < 0) {
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+ break;
+ }
+
+ if (head == vq->num) {
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ /* We cannot finish yet if more buffers snuck in while
+ * re-enabling notify.
+ */
+ if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
+ vhost_disable_notify(&vsock->dev, vq);
+ continue;
+ }
+ break;
+ }
+
+ if (out) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Expected 0 output buffers, got %u\n", out);
+ break;
+ }
+
+ len = iov_length(&vq->iov[out], in);
+ iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len);
+
+ nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
+ if (nbytes != sizeof(pkt->hdr)) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Faulted on copying pkt hdr\n");
+ break;
+ }
+
+ nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter);
+ if (nbytes != pkt->len) {
+ virtio_transport_free_pkt(pkt);
+ vq_err(vq, "Faulted on copying pkt buf\n");
+ break;
+ }
+
+ vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len);
+ added = true;
+
+ if (pkt->reply) {
+ int val;
+
+ val = atomic_dec_return(&vsock->queued_replies);
+
+ /* Do we have resources to resume tx processing? */
+ if (val + 1 == tx_vq->num)
+ restart_tx = true;
+ }
+
+ virtio_transport_free_pkt(pkt);
+ }
+ if (added)
+ vhost_signal(&vsock->dev, vq);
+
+out:
+ mutex_unlock(&vq->mutex);
+
+ if (restart_tx)
+ vhost_poll_queue(&tx_vq->poll);
+}
+
+static void vhost_transport_send_pkt_work(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq;
+ struct vhost_vsock *vsock;
+
+ vsock = container_of(work, struct vhost_vsock, send_pkt_work);
+ vq = &vsock->vqs[VSOCK_VQ_RX];
+
+ vhost_transport_do_send_pkt(vsock, vq);
+}
+
+static int
+vhost_transport_send_pkt(struct virtio_vsock_pkt *pkt)
+{
+ struct vhost_vsock *vsock;
+ struct vhost_virtqueue *vq;
+ int len = pkt->len;
+
+ /* Find the vhost_vsock according to guest context id */
+ vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid));
+ if (!vsock) {
+ virtio_transport_free_pkt(pkt);
+ return -ENODEV;
+ }
+
+ vq = &vsock->vqs[VSOCK_VQ_RX];
+
+ if (pkt->reply)
+ atomic_inc(&vsock->queued_replies);
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ list_add_tail(&pkt->list, &vsock->send_pkt_list);
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
+ return len;
+}
+
+static struct virtio_vsock_pkt *
+vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
+ unsigned int out, unsigned int in)
+{
+ struct virtio_vsock_pkt *pkt;
+ struct iov_iter iov_iter;
+ size_t nbytes;
+ size_t len;
+
+ if (in != 0) {
+ vq_err(vq, "Expected 0 input buffers, got %u\n", in);
+ return NULL;
+ }
+
+ pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
+ if (!pkt)
+ return NULL;
+
+ len = iov_length(vq->iov, out);
+ iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
+
+ nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
+ if (nbytes != sizeof(pkt->hdr)) {
+ vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
+ sizeof(pkt->hdr), nbytes);
+ kfree(pkt);
+ return NULL;
+ }
+
+ if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
+ pkt->len = le32_to_cpu(pkt->hdr.len);
+
+ /* No payload */
+ if (!pkt->len)
+ return pkt;
+
+ /* The pkt is too big */
+ if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
+ kfree(pkt);
+ return NULL;
+ }
+
+ pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
+ if (!pkt->buf) {
+ kfree(pkt);
+ return NULL;
+ }
+
+ nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
+ if (nbytes != pkt->len) {
+ vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
+ pkt->len, nbytes);
+ virtio_transport_free_pkt(pkt);
+ return NULL;
+ }
+
+ return pkt;
+}
+
+/* Is there space left for replies to rx packets? */
+static bool vhost_vsock_more_replies(struct vhost_vsock *vsock)
+{
+ struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX];
+ int val;
+
+ smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
+ val = atomic_read(&vsock->queued_replies);
+
+ return val < vq->num;
+}
+
+static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+ struct virtio_vsock_pkt *pkt;
+ int head;
+ unsigned int out, in;
+ bool added = false;
+
+ mutex_lock(&vq->mutex);
+
+ if (!vq->private_data)
+ goto out;
+
+ vhost_disable_notify(&vsock->dev, vq);
+ for (;;) {
+ if (!vhost_vsock_more_replies(vsock)) {
+ /* Stop tx until the device processes already
+ * pending replies. Leave tx virtqueue
+ * callbacks disabled.
+ */
+ goto no_more_replies;
+ }
+
+ head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
+ &out, &in, NULL, NULL);
+ if (head < 0)
+ break;
+
+ if (head == vq->num) {
+ if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
+ vhost_disable_notify(&vsock->dev, vq);
+ continue;
+ }
+ break;
+ }
+
+ pkt = vhost_vsock_alloc_pkt(vq, out, in);
+ if (!pkt) {
+ vq_err(vq, "Faulted on pkt\n");
+ continue;
+ }
+
+ /* Only accept correctly addressed packets */
+ if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid)
+ virtio_transport_recv_pkt(pkt);
+ else
+ virtio_transport_free_pkt(pkt);
+
+ vhost_add_used(vq, head, sizeof(pkt->hdr) + pkt->len);
+ added = true;
+ }
+
+no_more_replies:
+ if (added)
+ vhost_signal(&vsock->dev, vq);
+
+out:
+ mutex_unlock(&vq->mutex);
+}
+
+static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
+{
+ struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
+ poll.work);
+ struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
+ dev);
+
+ vhost_transport_do_send_pkt(vsock, vq);
+}
+
+static int vhost_vsock_start(struct vhost_vsock *vsock)
+{
+ size_t i;
+ int ret;
+
+ mutex_lock(&vsock->dev.mutex);
+
+ ret = vhost_dev_check_owner(&vsock->dev);
+ if (ret)
+ goto err;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ struct vhost_virtqueue *vq = &vsock->vqs[i];
+
+ mutex_lock(&vq->mutex);
+
+ if (!vhost_vq_access_ok(vq)) {
+ ret = -EFAULT;
+ mutex_unlock(&vq->mutex);
+ goto err_vq;
+ }
+
+ if (!vq->private_data) {
+ vq->private_data = vsock;
+ vhost_vq_init_access(vq);
+ }
+
+ mutex_unlock(&vq->mutex);
+ }
+
+ mutex_unlock(&vsock->dev.mutex);
+ return 0;
+
+err_vq:
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ struct vhost_virtqueue *vq = &vsock->vqs[i];
+
+ mutex_lock(&vq->mutex);
+ vq->private_data = NULL;
+ mutex_unlock(&vq->mutex);
+ }
+err:
+ mutex_unlock(&vsock->dev.mutex);
+ return ret;
+}
+
+static int vhost_vsock_stop(struct vhost_vsock *vsock)
+{
+ size_t i;
+ int ret;
+
+ mutex_lock(&vsock->dev.mutex);
+
+ ret = vhost_dev_check_owner(&vsock->dev);
+ if (ret)
+ goto err;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ struct vhost_virtqueue *vq = &vsock->vqs[i];
+
+ mutex_lock(&vq->mutex);
+ vq->private_data = NULL;
+ mutex_unlock(&vq->mutex);
+ }
+
+err:
+ mutex_unlock(&vsock->dev.mutex);
+ return ret;
+}
+
+static void vhost_vsock_free(struct vhost_vsock *vsock)
+{
+ if (is_vmalloc_addr(vsock))
+ vfree(vsock);
+ else
+ kfree(vsock);
+}
+
+static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
+{
+ struct vhost_virtqueue **vqs;
+ struct vhost_vsock *vsock;
+ int ret;
+
+ /* This struct is large and allocation could fail, fall back to vmalloc
+ * if there is no other way.
+ */
+ vsock = kzalloc(sizeof(*vsock), GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT);
+ if (!vsock) {
+ vsock = vmalloc(sizeof(*vsock));
+ if (!vsock)
+ return -ENOMEM;
+ }
+
+ vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL);
+ if (!vqs) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ atomic_set(&vsock->queued_replies, 0);
+
+ vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX];
+ vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX];
+ vsock->vqs[VSOCK_VQ_TX].handle_kick = vhost_vsock_handle_tx_kick;
+ vsock->vqs[VSOCK_VQ_RX].handle_kick = vhost_vsock_handle_rx_kick;
+
+ vhost_dev_init(&vsock->dev, vqs, ARRAY_SIZE(vsock->vqs));
+
+ file->private_data = vsock;
+ spin_lock_init(&vsock->send_pkt_list_lock);
+ INIT_LIST_HEAD(&vsock->send_pkt_list);
+ vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
+
+ spin_lock_bh(&vhost_vsock_lock);
+ list_add_tail(&vsock->list, &vhost_vsock_list);
+ spin_unlock_bh(&vhost_vsock_lock);
+ return 0;
+
+out:
+ vhost_vsock_free(vsock);
+ return ret;
+}
+
+static void vhost_vsock_flush(struct vhost_vsock *vsock)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++)
+ if (vsock->vqs[i].handle_kick)
+ vhost_poll_flush(&vsock->vqs[i].poll);
+ vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
+}
+
+static void vhost_vsock_reset_orphans(struct sock *sk)
+{
+ struct vsock_sock *vsk = vsock_sk(sk);
+
+ /* vmci_transport.c doesn't take sk_lock here either. At least we're
+ * under vsock_table_lock so the sock cannot disappear while we're
+ * executing.
+ */
+
+ if (!vhost_vsock_get(vsk->local_addr.svm_cid)) {
+ sock_set_flag(sk, SOCK_DONE);
+ vsk->peer_shutdown = SHUTDOWN_MASK;
+ sk->sk_state = SS_UNCONNECTED;
+ sk->sk_err = ECONNRESET;
+ sk->sk_error_report(sk);
+ }
+}
+
+static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
+{
+ struct vhost_vsock *vsock = file->private_data;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ list_del(&vsock->list);
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ /* Iterating over all connections for all CIDs to find orphans is
+ * inefficient. Room for improvement here. */
+ vsock_for_each_connected_socket(vhost_vsock_reset_orphans);
+
+ vhost_vsock_stop(vsock);
+ vhost_vsock_flush(vsock);
+ vhost_dev_stop(&vsock->dev);
+
+ spin_lock_bh(&vsock->send_pkt_list_lock);
+ while (!list_empty(&vsock->send_pkt_list)) {
+ struct virtio_vsock_pkt *pkt;
+
+ pkt = list_first_entry(&vsock->send_pkt_list,
+ struct virtio_vsock_pkt, list);
+ list_del_init(&pkt->list);
+ virtio_transport_free_pkt(pkt);
+ }
+ spin_unlock_bh(&vsock->send_pkt_list_lock);
+
+ vhost_dev_cleanup(&vsock->dev, false);
+ kfree(vsock->dev.vqs);
+ vhost_vsock_free(vsock);
+ return 0;
+}
+
+static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u64 guest_cid)
+{
+ struct vhost_vsock *other;
+
+ /* Refuse reserved CIDs */
+ if (guest_cid <= VMADDR_CID_HOST ||
+ guest_cid == U32_MAX)
+ return -EINVAL;
+
+ /* 64-bit CIDs are not yet supported */
+ if (guest_cid > U32_MAX)
+ return -EINVAL;
+
+ /* Refuse if CID is already in use */
+ other = vhost_vsock_get(guest_cid);
+ if (other && other != vsock)
+ return -EADDRINUSE;
+
+ spin_lock_bh(&vhost_vsock_lock);
+ vsock->guest_cid = guest_cid;
+ spin_unlock_bh(&vhost_vsock_lock);
+
+ return 0;
+}
+
+static int vhost_vsock_set_features(struct vhost_vsock *vsock, u64 features)
+{
+ struct vhost_virtqueue *vq;
+ int i;
+
+ if (features & ~VHOST_VSOCK_FEATURES)
+ return -EOPNOTSUPP;
+
+ mutex_lock(&vsock->dev.mutex);
+ if ((features & (1 << VHOST_F_LOG_ALL)) &&
+ !vhost_log_access_ok(&vsock->dev)) {
+ mutex_unlock(&vsock->dev.mutex);
+ return -EFAULT;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
+ vq = &vsock->vqs[i];
+ mutex_lock(&vq->mutex);
+ vq->acked_features = features;
+ mutex_unlock(&vq->mutex);
+ }
+ mutex_unlock(&vsock->dev.mutex);
+ return 0;
+}
+
+static long vhost_vsock_dev_ioctl(struct file *f, unsigned int ioctl,
+ unsigned long arg)
+{
+ struct vhost_vsock *vsock = f->private_data;
+ void __user *argp = (void __user *)arg;
+ u64 guest_cid;
+ u64 features;
+ int start;
+ int r;
+
+ switch (ioctl) {
+ case VHOST_VSOCK_SET_GUEST_CID:
+ if (copy_from_user(&guest_cid, argp, sizeof(guest_cid)))
+ return -EFAULT;
+ return vhost_vsock_set_cid(vsock, guest_cid);
+ case VHOST_VSOCK_SET_RUNNING:
+ if (copy_from_user(&start, argp, sizeof(start)))
+ return -EFAULT;
+ if (start)
+ return vhost_vsock_start(vsock);
+ else
+ return vhost_vsock_stop(vsock);
+ case VHOST_GET_FEATURES:
+ features = VHOST_VSOCK_FEATURES;
+ if (copy_to_user(argp, &features, sizeof(features)))
+ return -EFAULT;
+ return 0;
+ case VHOST_SET_FEATURES:
+ if (copy_from_user(&features, argp, sizeof(features)))
+ return -EFAULT;
+ return vhost_vsock_set_features(vsock, features);
+ default:
+ mutex_lock(&vsock->dev.mutex);
+ r = vhost_dev_ioctl(&vsock->dev, ioctl, argp);
+ if (r == -ENOIOCTLCMD)
+ r = vhost_vring_ioctl(&vsock->dev, ioctl, argp);
+ else
+ vhost_vsock_flush(vsock);
+ mutex_unlock(&vsock->dev.mutex);
+ return r;
+ }
+}
+
+static const struct file_operations vhost_vsock_fops = {
+ .owner = THIS_MODULE,
+ .open = vhost_vsock_dev_open,
+ .release = vhost_vsock_dev_release,
+ .llseek = noop_llseek,
+ .unlocked_ioctl = vhost_vsock_dev_ioctl,
+};
+
+static struct miscdevice vhost_vsock_misc = {
+ .minor = MISC_DYNAMIC_MINOR,
+ .name = "vhost-vsock",
+ .fops = &vhost_vsock_fops,
+};
+
+static struct virtio_transport vhost_transport = {
+ .transport = {
+ .get_local_cid = vhost_transport_get_local_cid,
+
+ .init = virtio_transport_do_socket_init,
+ .destruct = virtio_transport_destruct,
+ .release = virtio_transport_release,
+ .connect = virtio_transport_connect,
+ .shutdown = virtio_transport_shutdown,
+
+ .dgram_enqueue = virtio_transport_dgram_enqueue,
+ .dgram_dequeue = virtio_transport_dgram_dequeue,
+ .dgram_bind = virtio_transport_dgram_bind,
+ .dgram_allow = virtio_transport_dgram_allow,
+
+ .stream_enqueue = virtio_transport_stream_enqueue,
+ .stream_dequeue = virtio_transport_stream_dequeue,
+ .stream_has_data = virtio_transport_stream_has_data,
+ .stream_has_space = virtio_transport_stream_has_space,
+ .stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
+ .stream_is_active = virtio_transport_stream_is_active,
+ .stream_allow = virtio_transport_stream_allow,
+
+ .notify_poll_in = virtio_transport_notify_poll_in,
+ .notify_poll_out = virtio_transport_notify_poll_out,
+ .notify_recv_init = virtio_transport_notify_recv_init,
+ .notify_recv_pre_block = virtio_transport_notify_recv_pre_block,
+ .notify_recv_pre_dequeue = virtio_transport_notify_recv_pre_dequeue,
+ .notify_recv_post_dequeue = virtio_transport_notify_recv_post_dequeue,
+ .notify_send_init = virtio_transport_notify_send_init,
+ .notify_send_pre_block = virtio_transport_notify_send_pre_block,
+ .notify_send_pre_enqueue = virtio_transport_notify_send_pre_enqueue,
+ .notify_send_post_enqueue = virtio_transport_notify_send_post_enqueue,
+
+ .set_buffer_size = virtio_transport_set_buffer_size,
+ .set_min_buffer_size = virtio_transport_set_min_buffer_size,
+ .set_max_buffer_size = virtio_transport_set_max_buffer_size,
+ .get_buffer_size = virtio_transport_get_buffer_size,
+ .get_min_buffer_size = virtio_transport_get_min_buffer_size,
+ .get_max_buffer_size = virtio_transport_get_max_buffer_size,
+ },
+
+ .send_pkt = vhost_transport_send_pkt,
+};
+
+static int __init vhost_vsock_init(void)
+{
+ int ret;
+
+ ret = vsock_core_init(&vhost_transport.transport);
+ if (ret < 0)
+ return ret;
+ return misc_register(&vhost_vsock_misc);
+};
+
+static void __exit vhost_vsock_exit(void)
+{
+ misc_deregister(&vhost_vsock_misc);
+ vsock_core_exit();
+};
+
+module_init(vhost_vsock_init);
+module_exit(vhost_vsock_exit);
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Asias He");
+MODULE_DESCRIPTION("vhost transport for vsock ");

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