2016-07-28 17:36:34 +03:00
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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/atomic.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/vmalloc.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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#define VHOST_VSOCK_DEFAULT_HOST_CID 2
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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 DEFINE_SPINLOCK(vhost_vsock_lock);
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static LIST_HEAD(vhost_vsock_list);
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struct vhost_vsock {
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struct vhost_dev dev;
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struct vhost_virtqueue vqs[2];
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/* Link to global vhost_vsock_list, protected by vhost_vsock_lock */
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struct list_head list;
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struct vhost_work send_pkt_work;
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spinlock_t send_pkt_list_lock;
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struct list_head send_pkt_list; /* host->guest pending packets */
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atomic_t queued_replies;
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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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return VHOST_VSOCK_DEFAULT_HOST_CID;
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}
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2016-12-14 14:24:36 +03:00
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static struct vhost_vsock *__vhost_vsock_get(u32 guest_cid)
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2016-07-28 17:36:34 +03:00
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{
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struct vhost_vsock *vsock;
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list_for_each_entry(vsock, &vhost_vsock_list, list) {
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u32 other_cid = vsock->guest_cid;
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/* Skip instances that have no CID yet */
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if (other_cid == 0)
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continue;
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if (other_cid == guest_cid) {
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return vsock;
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}
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}
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return NULL;
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}
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2016-12-14 14:24:36 +03:00
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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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spin_lock_bh(&vhost_vsock_lock);
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vsock = __vhost_vsock_get(guest_cid);
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spin_unlock_bh(&vhost_vsock_lock);
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return vsock;
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}
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2016-07-28 17:36:34 +03:00
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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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struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
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bool added = false;
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bool restart_tx = false;
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mutex_lock(&vq->mutex);
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if (!vq->private_data)
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goto out;
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/* Avoid further vmexits, we're already processing the virtqueue */
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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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size_t nbytes;
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size_t len;
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int head;
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spin_lock_bh(&vsock->send_pkt_list_lock);
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if (list_empty(&vsock->send_pkt_list)) {
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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vhost_enable_notify(&vsock->dev, vq);
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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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spin_unlock_bh(&vsock->send_pkt_list_lock);
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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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spin_lock_bh(&vsock->send_pkt_list_lock);
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list_add(&pkt->list, &vsock->send_pkt_list);
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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break;
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}
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if (head == vq->num) {
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spin_lock_bh(&vsock->send_pkt_list_lock);
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list_add(&pkt->list, &vsock->send_pkt_list);
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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/* We cannot finish yet if more buffers snuck in while
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* re-enabling notify.
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*/
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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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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, sizeof(pkt->hdr) + pkt->len);
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added = true;
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if (pkt->reply) {
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int val;
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val = atomic_dec_return(&vsock->queued_replies);
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/* Do we have resources to resume tx processing? */
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if (val + 1 == tx_vq->num)
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restart_tx = true;
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}
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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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out:
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mutex_unlock(&vq->mutex);
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if (restart_tx)
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vhost_poll_queue(&tx_vq->poll);
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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];
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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 virtio_vsock_pkt *pkt)
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{
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struct vhost_vsock *vsock;
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int len = pkt->len;
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/* Find the vhost_vsock according to guest context id */
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vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid));
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if (!vsock) {
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virtio_transport_free_pkt(pkt);
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return -ENODEV;
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}
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if (pkt->reply)
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atomic_inc(&vsock->queued_replies);
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spin_lock_bh(&vsock->send_pkt_list_lock);
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list_add_tail(&pkt->list, &vsock->send_pkt_list);
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
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return len;
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}
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2017-03-15 04:32:15 +03:00
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static int
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vhost_transport_cancel_pkt(struct vsock_sock *vsk)
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{
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struct vhost_vsock *vsock;
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struct virtio_vsock_pkt *pkt, *n;
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int cnt = 0;
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LIST_HEAD(freeme);
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/* Find the vhost_vsock according to guest context id */
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vsock = vhost_vsock_get(vsk->remote_addr.svm_cid);
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if (!vsock)
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return -ENODEV;
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spin_lock_bh(&vsock->send_pkt_list_lock);
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list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) {
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if (pkt->vsk != vsk)
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continue;
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list_move(&pkt->list, &freeme);
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}
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spin_unlock_bh(&vsock->send_pkt_list_lock);
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list_for_each_entry_safe(pkt, n, &freeme, list) {
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if (pkt->reply)
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cnt++;
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list_del(&pkt->list);
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virtio_transport_free_pkt(pkt);
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}
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if (cnt) {
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struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
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int new_cnt;
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new_cnt = atomic_sub_return(cnt, &vsock->queued_replies);
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if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num)
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vhost_poll_queue(&tx_vq->poll);
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}
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return 0;
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}
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2016-07-28 17:36:34 +03:00
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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_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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/* Is there space left for replies to rx packets? */
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static bool vhost_vsock_more_replies(struct vhost_vsock *vsock)
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{
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struct vhost_virtqueue *vq = &vsock->vqs[VSOCK_VQ_TX];
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int val;
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smp_rmb(); /* paired with atomic_inc() and atomic_dec_return() */
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val = atomic_read(&vsock->queued_replies);
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return val < vq->num;
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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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mutex_lock(&vq->mutex);
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if (!vq->private_data)
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goto out;
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vhost_disable_notify(&vsock->dev, vq);
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for (;;) {
|
2016-08-04 16:52:53 +03:00
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u32 len;
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2016-07-28 17:36:34 +03:00
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if (!vhost_vsock_more_replies(vsock)) {
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/* Stop tx until the device processes already
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* pending replies. Leave tx virtqueue
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* callbacks disabled.
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*/
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goto no_more_replies;
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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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|
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;
|
|
|
|
}
|
|
|
|
|
2016-08-04 16:52:53 +03:00
|
|
|
len = pkt->len;
|
|
|
|
|
2016-07-28 17:36:34 +03:00
|
|
|
/* 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);
|
|
|
|
|
2016-08-04 16:52:53 +03:00
|
|
|
vhost_add_used(vq, head, sizeof(pkt->hdr) + len);
|
2016-07-28 17:36:34 +03:00
|
|
|
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)
|
|
|
|
{
|
2017-01-19 13:43:53 +03:00
|
|
|
struct vhost_virtqueue *vq;
|
2016-07-28 17:36:34 +03:00
|
|
|
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++) {
|
2017-01-19 13:43:53 +03:00
|
|
|
vq = &vsock->vqs[i];
|
2016-07-28 17:36:34 +03:00
|
|
|
|
|
|
|
mutex_lock(&vq->mutex);
|
|
|
|
|
|
|
|
if (!vhost_vq_access_ok(vq)) {
|
|
|
|
ret = -EFAULT;
|
|
|
|
goto err_vq;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (!vq->private_data) {
|
|
|
|
vq->private_data = vsock;
|
2017-01-19 13:43:53 +03:00
|
|
|
ret = vhost_vq_init_access(vq);
|
|
|
|
if (ret)
|
|
|
|
goto err_vq;
|
2016-07-28 17:36:34 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&vq->mutex);
|
|
|
|
}
|
|
|
|
|
|
|
|
mutex_unlock(&vsock->dev.mutex);
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
err_vq:
|
2017-01-19 13:43:53 +03:00
|
|
|
vq->private_data = NULL;
|
|
|
|
mutex_unlock(&vq->mutex);
|
|
|
|
|
2016-07-28 17:36:34 +03:00
|
|
|
for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
|
2017-01-19 13:43:53 +03:00
|
|
|
vq = &vsock->vqs[i];
|
2016-07-28 17:36:34 +03:00
|
|
|
|
|
|
|
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)
|
|
|
|
{
|
2016-08-02 16:50:42 +03:00
|
|
|
kvfree(vsock);
|
2016-07-28 17:36:34 +03:00
|
|
|
}
|
|
|
|
|
|
|
|
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.
|
|
|
|
*/
|
|
|
|
|
2016-12-08 20:10:46 +03:00
|
|
|
if (!vhost_vsock_get(vsk->remote_addr.svm_cid)) {
|
2016-07-28 17:36:34 +03:00
|
|
|
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 */
|
|
|
|
spin_lock_bh(&vhost_vsock_lock);
|
2016-12-14 14:24:36 +03:00
|
|
|
other = __vhost_vsock_get(guest_cid);
|
|
|
|
if (other && other != vsock) {
|
|
|
|
spin_unlock_bh(&vhost_vsock_lock);
|
|
|
|
return -EADDRINUSE;
|
|
|
|
}
|
2016-07-28 17:36:34 +03:00
|
|
|
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,
|
2017-03-15 04:32:15 +03:00
|
|
|
.cancel_pkt = vhost_transport_cancel_pkt,
|
2016-07-28 17:36:34 +03:00
|
|
|
|
|
|
|
.dgram_enqueue = virtio_transport_dgram_enqueue,
|
|
|
|
.dgram_dequeue = virtio_transport_dgram_dequeue,
|
|
|
|
.dgram_bind = virtio_transport_dgram_bind,
|
|
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.dgram_allow = virtio_transport_dgram_allow,
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|
|
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|
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.stream_enqueue = virtio_transport_stream_enqueue,
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.stream_dequeue = virtio_transport_stream_dequeue,
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|
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.stream_has_data = virtio_transport_stream_has_data,
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|
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.stream_has_space = virtio_transport_stream_has_space,
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|
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.stream_rcvhiwat = virtio_transport_stream_rcvhiwat,
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|
|
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.stream_is_active = virtio_transport_stream_is_active,
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|
|
.stream_allow = virtio_transport_stream_allow,
|
|
|
|
|
|
|
|
.notify_poll_in = virtio_transport_notify_poll_in,
|
|
|
|
.notify_poll_out = virtio_transport_notify_poll_out,
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|
|
|
.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 ");
|