VSOCK: Introduce vhost-vsock.ko
VM sockets vhost transport implementation. This module runs in host kernel. Signed-off-by: Asias He <asias@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Asias He
David S. Miller
parent
32e61b06b6
commit
98bb892821
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@ -0,0 +1,631 @@
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/*
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* vhost transport for vsock
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*
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* Copyright (C) 2013-2015 Red Hat, Inc.
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* Author: Asias He <asias@redhat.com>
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2.
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*/
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <net/sock.h>
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#include <linux/virtio_vsock.h>
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#include <linux/vhost.h>
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#include <net/af_vsock.h>
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#include "vhost.h"
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#include "vsock.h"
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#define VHOST_VSOCK_DEFAULT_HOST_CID 2
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static int vhost_transport_socket_init(struct vsock_sock *vsk,
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struct vsock_sock *psk);
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enum {
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VHOST_VSOCK_FEATURES = VHOST_FEATURES,
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};
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/* Used to track all the vhost_vsock instances on the system. */
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static LIST_HEAD(vhost_vsock_list);
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static DEFINE_MUTEX(vhost_vsock_mutex);
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struct vhost_vsock_virtqueue {
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struct vhost_virtqueue vq;
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};
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struct vhost_vsock {
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/* Vhost device */
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struct vhost_dev dev;
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/* Vhost vsock virtqueue*/
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struct vhost_vsock_virtqueue vqs[VSOCK_VQ_MAX];
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/* Link to global vhost_vsock_list*/
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struct list_head list;
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/* Head for pkt from host to guest */
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struct list_head send_pkt_list;
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/* Work item to send pkt */
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struct vhost_work send_pkt_work;
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/* Wait queue for send pkt */
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wait_queue_head_t queue_wait;
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/* Used for global tx buf limitation */
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u32 total_tx_buf;
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/* Guest contex id this vhost_vsock instance handles */
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u32 guest_cid;
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};
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static u32 vhost_transport_get_local_cid(void)
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{
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u32 cid = VHOST_VSOCK_DEFAULT_HOST_CID;
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return cid;
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}
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static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
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{
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struct vhost_vsock *vsock;
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mutex_lock(&vhost_vsock_mutex);
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list_for_each_entry(vsock, &vhost_vsock_list, list) {
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if (vsock->guest_cid == guest_cid) {
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mutex_unlock(&vhost_vsock_mutex);
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return vsock;
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}
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}
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mutex_unlock(&vhost_vsock_mutex);
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return NULL;
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}
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static void
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vhost_transport_do_send_pkt(struct vhost_vsock *vsock,
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struct vhost_virtqueue *vq)
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{
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bool added = false;
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mutex_lock(&vq->mutex);
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vhost_disable_notify(&vsock->dev, vq);
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for (;;) {
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struct virtio_vsock_pkt *pkt;
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struct iov_iter iov_iter;
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unsigned out, in;
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struct sock *sk;
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size_t nbytes;
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size_t len;
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int head;
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if (list_empty(&vsock->send_pkt_list)) {
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vhost_enable_notify(&vsock->dev, vq);
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break;
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}
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head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
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&out, &in, NULL, NULL);
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pr_debug("%s: head = %d\n", __func__, head);
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if (head < 0)
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break;
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if (head == vq->num) {
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if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
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vhost_disable_notify(&vsock->dev, vq);
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continue;
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}
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break;
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}
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pkt = list_first_entry(&vsock->send_pkt_list,
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struct virtio_vsock_pkt, list);
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list_del_init(&pkt->list);
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if (out) {
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virtio_transport_free_pkt(pkt);
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vq_err(vq, "Expected 0 output buffers, got %u\n", out);
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break;
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}
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len = iov_length(&vq->iov[out], in);
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iov_iter_init(&iov_iter, READ, &vq->iov[out], in, len);
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nbytes = copy_to_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
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if (nbytes != sizeof(pkt->hdr)) {
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virtio_transport_free_pkt(pkt);
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vq_err(vq, "Faulted on copying pkt hdr\n");
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break;
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}
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nbytes = copy_to_iter(pkt->buf, pkt->len, &iov_iter);
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if (nbytes != pkt->len) {
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virtio_transport_free_pkt(pkt);
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vq_err(vq, "Faulted on copying pkt buf\n");
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break;
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}
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vhost_add_used(vq, head, pkt->len); /* TODO should this be sizeof(pkt->hdr) + pkt->len? */
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added = true;
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virtio_transport_dec_tx_pkt(pkt);
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vsock->total_tx_buf -= pkt->len;
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sk = sk_vsock(pkt->trans->vsk);
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/* Release refcnt taken in vhost_transport_send_pkt */
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sock_put(sk);
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virtio_transport_free_pkt(pkt);
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}
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if (added)
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vhost_signal(&vsock->dev, vq);
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mutex_unlock(&vq->mutex);
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if (added)
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wake_up(&vsock->queue_wait);
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}
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static void vhost_transport_send_pkt_work(struct vhost_work *work)
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{
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struct vhost_virtqueue *vq;
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struct vhost_vsock *vsock;
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vsock = container_of(work, struct vhost_vsock, send_pkt_work);
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vq = &vsock->vqs[VSOCK_VQ_RX].vq;
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vhost_transport_do_send_pkt(vsock, vq);
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}
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static int
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vhost_transport_send_pkt(struct vsock_sock *vsk,
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struct virtio_vsock_pkt_info *info)
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{
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u32 src_cid, src_port, dst_cid, dst_port;
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struct virtio_transport *trans;
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struct virtio_vsock_pkt *pkt;
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struct vhost_virtqueue *vq;
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struct vhost_vsock *vsock;
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u32 pkt_len = info->pkt_len;
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DEFINE_WAIT(wait);
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src_cid = vhost_transport_get_local_cid();
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src_port = vsk->local_addr.svm_port;
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if (!info->remote_cid) {
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dst_cid = vsk->remote_addr.svm_cid;
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dst_port = vsk->remote_addr.svm_port;
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} else {
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dst_cid = info->remote_cid;
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dst_port = info->remote_port;
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}
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/* Find the vhost_vsock according to guest context id */
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vsock = vhost_vsock_get(dst_cid);
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if (!vsock)
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return -ENODEV;
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trans = vsk->trans;
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vq = &vsock->vqs[VSOCK_VQ_RX].vq;
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/* we can send less than pkt_len bytes */
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if (pkt_len > VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE)
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pkt_len = VIRTIO_VSOCK_DEFAULT_RX_BUF_SIZE;
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/* virtio_transport_get_credit might return less than pkt_len credit */
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pkt_len = virtio_transport_get_credit(trans, pkt_len);
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/* Do not send zero length OP_RW pkt*/
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if (pkt_len == 0 && info->op == VIRTIO_VSOCK_OP_RW)
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return pkt_len;
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/* Respect global tx buf limitation */
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mutex_lock(&vq->mutex);
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while (pkt_len + vsock->total_tx_buf > VIRTIO_VSOCK_MAX_TX_BUF_SIZE) {
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prepare_to_wait_exclusive(&vsock->queue_wait, &wait,
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TASK_UNINTERRUPTIBLE);
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mutex_unlock(&vq->mutex);
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schedule();
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mutex_lock(&vq->mutex);
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finish_wait(&vsock->queue_wait, &wait);
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}
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vsock->total_tx_buf += pkt_len;
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mutex_unlock(&vq->mutex);
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pkt = virtio_transport_alloc_pkt(vsk, info, pkt_len,
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src_cid, src_port,
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dst_cid, dst_port);
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if (!pkt) {
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mutex_lock(&vq->mutex);
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vsock->total_tx_buf -= pkt_len;
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mutex_unlock(&vq->mutex);
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virtio_transport_put_credit(trans, pkt_len);
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return -ENOMEM;
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}
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pr_debug("%s:info->pkt_len= %d\n", __func__, pkt_len);
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/* Released in vhost_transport_do_send_pkt */
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sock_hold(&trans->vsk->sk);
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virtio_transport_inc_tx_pkt(pkt);
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/* Queue it up in vhost work */
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mutex_lock(&vq->mutex);
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list_add_tail(&pkt->list, &vsock->send_pkt_list);
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vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
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mutex_unlock(&vq->mutex);
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return pkt_len;
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}
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static struct virtio_transport_pkt_ops vhost_ops = {
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.send_pkt = vhost_transport_send_pkt,
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};
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static struct virtio_vsock_pkt *
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vhost_vsock_alloc_pkt(struct vhost_virtqueue *vq,
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unsigned int out, unsigned int in)
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{
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struct virtio_vsock_pkt *pkt;
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struct iov_iter iov_iter;
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size_t nbytes;
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size_t len;
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if (in != 0) {
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vq_err(vq, "Expected 0 input buffers, got %u\n", in);
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return NULL;
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}
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pkt = kzalloc(sizeof(*pkt), GFP_KERNEL);
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if (!pkt)
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return NULL;
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len = iov_length(vq->iov, out);
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iov_iter_init(&iov_iter, WRITE, vq->iov, out, len);
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nbytes = copy_from_iter(&pkt->hdr, sizeof(pkt->hdr), &iov_iter);
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if (nbytes != sizeof(pkt->hdr)) {
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vq_err(vq, "Expected %zu bytes for pkt->hdr, got %zu bytes\n",
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sizeof(pkt->hdr), nbytes);
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kfree(pkt);
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return NULL;
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}
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if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_DGRAM)
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pkt->len = le32_to_cpu(pkt->hdr.len) & 0XFFFF;
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else if (le16_to_cpu(pkt->hdr.type) == VIRTIO_VSOCK_TYPE_STREAM)
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pkt->len = le32_to_cpu(pkt->hdr.len);
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/* No payload */
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if (!pkt->len)
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return pkt;
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/* The pkt is too big */
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if (pkt->len > VIRTIO_VSOCK_MAX_PKT_BUF_SIZE) {
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kfree(pkt);
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return NULL;
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}
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pkt->buf = kmalloc(pkt->len, GFP_KERNEL);
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if (!pkt->buf) {
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kfree(pkt);
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return NULL;
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}
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nbytes = copy_from_iter(pkt->buf, pkt->len, &iov_iter);
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if (nbytes != pkt->len) {
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vq_err(vq, "Expected %u byte payload, got %zu bytes\n",
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pkt->len, nbytes);
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virtio_transport_free_pkt(pkt);
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return NULL;
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}
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return pkt;
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}
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static void vhost_vsock_handle_ctl_kick(struct vhost_work *work)
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{
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struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
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poll.work);
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struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
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dev);
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pr_debug("%s vq=%p, vsock=%p\n", __func__, vq, vsock);
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}
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static void vhost_vsock_handle_tx_kick(struct vhost_work *work)
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{
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struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
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poll.work);
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struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
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dev);
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struct virtio_vsock_pkt *pkt;
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int head;
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unsigned int out, in;
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bool added = false;
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u32 len;
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mutex_lock(&vq->mutex);
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vhost_disable_notify(&vsock->dev, vq);
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for (;;) {
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head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov),
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&out, &in, NULL, NULL);
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if (head < 0)
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break;
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if (head == vq->num) {
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if (unlikely(vhost_enable_notify(&vsock->dev, vq))) {
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vhost_disable_notify(&vsock->dev, vq);
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continue;
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}
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break;
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}
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pkt = vhost_vsock_alloc_pkt(vq, out, in);
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if (!pkt) {
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vq_err(vq, "Faulted on pkt\n");
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continue;
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}
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len = pkt->len;
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/* Only accept correctly addressed packets */
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if (le32_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
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le32_to_cpu(pkt->hdr.dst_cid) == vhost_transport_get_local_cid())
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virtio_transport_recv_pkt(pkt);
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else
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virtio_transport_free_pkt(pkt);
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vhost_add_used(vq, head, len);
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added = true;
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}
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if (added)
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vhost_signal(&vsock->dev, vq);
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mutex_unlock(&vq->mutex);
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}
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static void vhost_vsock_handle_rx_kick(struct vhost_work *work)
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{
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struct vhost_virtqueue *vq = container_of(work, struct vhost_virtqueue,
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poll.work);
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struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock,
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dev);
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vhost_transport_do_send_pkt(vsock, vq);
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}
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static int vhost_vsock_dev_open(struct inode *inode, struct file *file)
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{
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struct vhost_virtqueue **vqs;
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struct vhost_vsock *vsock;
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int ret;
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vsock = kzalloc(sizeof(*vsock), GFP_KERNEL);
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if (!vsock)
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return -ENOMEM;
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pr_debug("%s:vsock=%p\n", __func__, vsock);
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vqs = kmalloc(VSOCK_VQ_MAX * sizeof(*vqs), GFP_KERNEL);
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if (!vqs) {
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ret = -ENOMEM;
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goto out;
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}
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vqs[VSOCK_VQ_CTRL] = &vsock->vqs[VSOCK_VQ_CTRL].vq;
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vqs[VSOCK_VQ_TX] = &vsock->vqs[VSOCK_VQ_TX].vq;
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vqs[VSOCK_VQ_RX] = &vsock->vqs[VSOCK_VQ_RX].vq;
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vsock->vqs[VSOCK_VQ_CTRL].vq.handle_kick = vhost_vsock_handle_ctl_kick;
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vsock->vqs[VSOCK_VQ_TX].vq.handle_kick = vhost_vsock_handle_tx_kick;
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vsock->vqs[VSOCK_VQ_RX].vq.handle_kick = vhost_vsock_handle_rx_kick;
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vhost_dev_init(&vsock->dev, vqs, VSOCK_VQ_MAX);
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file->private_data = vsock;
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init_waitqueue_head(&vsock->queue_wait);
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INIT_LIST_HEAD(&vsock->send_pkt_list);
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vhost_work_init(&vsock->send_pkt_work, vhost_transport_send_pkt_work);
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mutex_lock(&vhost_vsock_mutex);
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list_add_tail(&vsock->list, &vhost_vsock_list);
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mutex_unlock(&vhost_vsock_mutex);
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return 0;
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out:
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kfree(vsock);
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return ret;
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}
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static void vhost_vsock_flush(struct vhost_vsock *vsock)
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{
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int i;
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for (i = 0; i < VSOCK_VQ_MAX; i++)
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vhost_poll_flush(&vsock->vqs[i].vq.poll);
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vhost_work_flush(&vsock->dev, &vsock->send_pkt_work);
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}
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static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
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{
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struct vhost_vsock *vsock = file->private_data;
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mutex_lock(&vhost_vsock_mutex);
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list_del(&vsock->list);
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mutex_unlock(&vhost_vsock_mutex);
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vhost_dev_stop(&vsock->dev);
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vhost_vsock_flush(vsock);
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vhost_dev_cleanup(&vsock->dev, false);
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kfree(vsock->dev.vqs);
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||||
kfree(vsock);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int vhost_vsock_set_cid(struct vhost_vsock *vsock, u32 guest_cid)
|
||||
{
|
||||
struct vhost_vsock *other;
|
||||
|
||||
/* Refuse reserved CIDs */
|
||||
if (guest_cid <= VMADDR_CID_HOST) {
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
/* Refuse if CID is already in use */
|
||||
other = vhost_vsock_get(guest_cid);
|
||||
if (other && other != vsock) {
|
||||
return -EADDRINUSE;
|
||||
}
|
||||
|
||||
mutex_lock(&vhost_vsock_mutex);
|
||||
vsock->guest_cid = guest_cid;
|
||||
pr_debug("%s:guest_cid=%d\n", __func__, guest_cid);
|
||||
mutex_unlock(&vhost_vsock_mutex);
|
||||
|
||||
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 < VSOCK_VQ_MAX; i++) {
|
||||
vq = &vsock->vqs[i].vq;
|
||||
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 __user *featurep = argp;
|
||||
u32 __user *cidp = argp;
|
||||
u32 guest_cid;
|
||||
u64 features;
|
||||
int r;
|
||||
|
||||
switch (ioctl) {
|
||||
case VHOST_VSOCK_SET_GUEST_CID:
|
||||
if (get_user(guest_cid, cidp))
|
||||
return -EFAULT;
|
||||
return vhost_vsock_set_cid(vsock, guest_cid);
|
||||
case VHOST_GET_FEATURES:
|
||||
features = VHOST_VSOCK_FEATURES;
|
||||
if (copy_to_user(featurep, &features, sizeof(features)))
|
||||
return -EFAULT;
|
||||
return 0;
|
||||
case VHOST_SET_FEATURES:
|
||||
if (copy_from_user(&features, featurep, 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 int
|
||||
vhost_transport_socket_init(struct vsock_sock *vsk, struct vsock_sock *psk)
|
||||
{
|
||||
struct virtio_transport *trans;
|
||||
int ret;
|
||||
|
||||
ret = virtio_transport_do_socket_init(vsk, psk);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
trans = vsk->trans;
|
||||
trans->ops = &vhost_ops;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static struct vsock_transport vhost_transport = {
|
||||
.get_local_cid = vhost_transport_get_local_cid,
|
||||
|
||||
.init = vhost_transport_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,
|
||||
};
|
||||
|
||||
static int __init vhost_vsock_init(void)
|
||||
{
|
||||
int ret;
|
||||
|
||||
ret = vsock_core_init(&vhost_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 ");
|
||||
|
|
@ -0,0 +1,4 @@
|
|||
#ifndef VHOST_VSOCK_H
|
||||
#define VHOST_VSOCK_H
|
||||
#define VHOST_VSOCK_SET_GUEST_CID _IOW(VHOST_VIRTIO, 0x60, __u32)
|
||||
#endif
|
||||
Loading…
Reference in New Issue