mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Stefano Garzarella](/assets/img/avatar_default.png)
We can increment `total_len` directly and remove `len` since it is no longer used for vhost_add_used(). Signed-off-by: Stefano Garzarella <sgarzare@redhat.com> Link: https://lore.kernel.org/r/20211122163525.294024-3-sgarzare@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
974 lines
24 KiB
C
974 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* vhost transport for vsock
|
|
*
|
|
* Copyright (C) 2013-2015 Red Hat, Inc.
|
|
* Author: Asias He <asias@redhat.com>
|
|
* Stefan Hajnoczi <stefanha@redhat.com>
|
|
*/
|
|
#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 <linux/hashtable.h>
|
|
|
|
#include <net/af_vsock.h>
|
|
#include "vhost.h"
|
|
|
|
#define VHOST_VSOCK_DEFAULT_HOST_CID 2
|
|
/* Max number of bytes transferred before requeueing the job.
|
|
* Using this limit prevents one virtqueue from starving others. */
|
|
#define VHOST_VSOCK_WEIGHT 0x80000
|
|
/* Max number of packets transferred before requeueing the job.
|
|
* Using this limit prevents one virtqueue from starving others with
|
|
* small pkts.
|
|
*/
|
|
#define VHOST_VSOCK_PKT_WEIGHT 256
|
|
|
|
enum {
|
|
VHOST_VSOCK_FEATURES = VHOST_FEATURES |
|
|
(1ULL << VIRTIO_F_ACCESS_PLATFORM) |
|
|
(1ULL << VIRTIO_VSOCK_F_SEQPACKET)
|
|
};
|
|
|
|
enum {
|
|
VHOST_VSOCK_BACKEND_FEATURES = (1ULL << VHOST_BACKEND_F_IOTLB_MSG_V2)
|
|
};
|
|
|
|
/* Used to track all the vhost_vsock instances on the system. */
|
|
static DEFINE_MUTEX(vhost_vsock_mutex);
|
|
static DEFINE_READ_MOSTLY_HASHTABLE(vhost_vsock_hash, 8);
|
|
|
|
struct vhost_vsock {
|
|
struct vhost_dev dev;
|
|
struct vhost_virtqueue vqs[2];
|
|
|
|
/* Link to global vhost_vsock_hash, writes use vhost_vsock_mutex */
|
|
struct hlist_node hash;
|
|
|
|
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;
|
|
bool seqpacket_allow;
|
|
};
|
|
|
|
static u32 vhost_transport_get_local_cid(void)
|
|
{
|
|
return VHOST_VSOCK_DEFAULT_HOST_CID;
|
|
}
|
|
|
|
/* Callers that dereference the return value must hold vhost_vsock_mutex or the
|
|
* RCU read lock.
|
|
*/
|
|
static struct vhost_vsock *vhost_vsock_get(u32 guest_cid)
|
|
{
|
|
struct vhost_vsock *vsock;
|
|
|
|
hash_for_each_possible_rcu(vhost_vsock_hash, vsock, hash, guest_cid) {
|
|
u32 other_cid = vsock->guest_cid;
|
|
|
|
/* Skip instances that have no CID yet */
|
|
if (other_cid == 0)
|
|
continue;
|
|
|
|
if (other_cid == guest_cid)
|
|
return vsock;
|
|
|
|
}
|
|
|
|
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];
|
|
int pkts = 0, total_len = 0;
|
|
bool added = false;
|
|
bool restart_tx = false;
|
|
|
|
mutex_lock(&vq->mutex);
|
|
|
|
if (!vhost_vq_get_backend(vq))
|
|
goto out;
|
|
|
|
if (!vq_meta_prefetch(vq))
|
|
goto out;
|
|
|
|
/* Avoid further vmexits, we're already processing the virtqueue */
|
|
vhost_disable_notify(&vsock->dev, vq);
|
|
|
|
do {
|
|
struct virtio_vsock_pkt *pkt;
|
|
struct iov_iter iov_iter;
|
|
unsigned out, in;
|
|
size_t nbytes;
|
|
size_t iov_len, payload_len;
|
|
int head;
|
|
u32 flags_to_restore = 0;
|
|
|
|
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;
|
|
}
|
|
|
|
iov_len = iov_length(&vq->iov[out], in);
|
|
if (iov_len < sizeof(pkt->hdr)) {
|
|
virtio_transport_free_pkt(pkt);
|
|
vq_err(vq, "Buffer len [%zu] too small\n", iov_len);
|
|
break;
|
|
}
|
|
|
|
iov_iter_init(&iov_iter, READ, &vq->iov[out], in, iov_len);
|
|
payload_len = pkt->len - pkt->off;
|
|
|
|
/* If the packet is greater than the space available in the
|
|
* buffer, we split it using multiple buffers.
|
|
*/
|
|
if (payload_len > iov_len - sizeof(pkt->hdr)) {
|
|
payload_len = iov_len - sizeof(pkt->hdr);
|
|
|
|
/* As we are copying pieces of large packet's buffer to
|
|
* small rx buffers, headers of packets in rx queue are
|
|
* created dynamically and are initialized with header
|
|
* of current packet(except length). But in case of
|
|
* SOCK_SEQPACKET, we also must clear message delimeter
|
|
* bit (VIRTIO_VSOCK_SEQ_EOM) and MSG_EOR bit
|
|
* (VIRTIO_VSOCK_SEQ_EOR) if set. Otherwise,
|
|
* there will be sequence of packets with these
|
|
* bits set. After initialized header will be copied to
|
|
* rx buffer, these required bits will be restored.
|
|
*/
|
|
if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOM) {
|
|
pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOM);
|
|
flags_to_restore |= VIRTIO_VSOCK_SEQ_EOM;
|
|
|
|
if (le32_to_cpu(pkt->hdr.flags) & VIRTIO_VSOCK_SEQ_EOR) {
|
|
pkt->hdr.flags &= ~cpu_to_le32(VIRTIO_VSOCK_SEQ_EOR);
|
|
flags_to_restore |= VIRTIO_VSOCK_SEQ_EOR;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Set the correct length in the header */
|
|
pkt->hdr.len = cpu_to_le32(payload_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->off, payload_len,
|
|
&iov_iter);
|
|
if (nbytes != payload_len) {
|
|
virtio_transport_free_pkt(pkt);
|
|
vq_err(vq, "Faulted on copying pkt buf\n");
|
|
break;
|
|
}
|
|
|
|
/* Deliver to monitoring devices all packets that we
|
|
* will transmit.
|
|
*/
|
|
virtio_transport_deliver_tap_pkt(pkt);
|
|
|
|
vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len);
|
|
added = true;
|
|
|
|
pkt->off += payload_len;
|
|
total_len += payload_len;
|
|
|
|
/* If we didn't send all the payload we can requeue the packet
|
|
* to send it with the next available buffer.
|
|
*/
|
|
if (pkt->off < pkt->len) {
|
|
pkt->hdr.flags |= cpu_to_le32(flags_to_restore);
|
|
|
|
/* We are queueing the same virtio_vsock_pkt to handle
|
|
* the remaining bytes, and we want to deliver it
|
|
* to monitoring devices in the next iteration.
|
|
*/
|
|
pkt->tap_delivered = false;
|
|
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
list_add(&pkt->list, &vsock->send_pkt_list);
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
} else {
|
|
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);
|
|
}
|
|
} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
|
|
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;
|
|
int len = pkt->len;
|
|
|
|
rcu_read_lock();
|
|
|
|
/* Find the vhost_vsock according to guest context id */
|
|
vsock = vhost_vsock_get(le64_to_cpu(pkt->hdr.dst_cid));
|
|
if (!vsock) {
|
|
rcu_read_unlock();
|
|
virtio_transport_free_pkt(pkt);
|
|
return -ENODEV;
|
|
}
|
|
|
|
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);
|
|
|
|
rcu_read_unlock();
|
|
return len;
|
|
}
|
|
|
|
static int
|
|
vhost_transport_cancel_pkt(struct vsock_sock *vsk)
|
|
{
|
|
struct vhost_vsock *vsock;
|
|
struct virtio_vsock_pkt *pkt, *n;
|
|
int cnt = 0;
|
|
int ret = -ENODEV;
|
|
LIST_HEAD(freeme);
|
|
|
|
rcu_read_lock();
|
|
|
|
/* Find the vhost_vsock according to guest context id */
|
|
vsock = vhost_vsock_get(vsk->remote_addr.svm_cid);
|
|
if (!vsock)
|
|
goto out;
|
|
|
|
spin_lock_bh(&vsock->send_pkt_list_lock);
|
|
list_for_each_entry_safe(pkt, n, &vsock->send_pkt_list, list) {
|
|
if (pkt->vsk != vsk)
|
|
continue;
|
|
list_move(&pkt->list, &freeme);
|
|
}
|
|
spin_unlock_bh(&vsock->send_pkt_list_lock);
|
|
|
|
list_for_each_entry_safe(pkt, n, &freeme, list) {
|
|
if (pkt->reply)
|
|
cnt++;
|
|
list_del(&pkt->list);
|
|
virtio_transport_free_pkt(pkt);
|
|
}
|
|
|
|
if (cnt) {
|
|
struct vhost_virtqueue *tx_vq = &vsock->vqs[VSOCK_VQ_TX];
|
|
int new_cnt;
|
|
|
|
new_cnt = atomic_sub_return(cnt, &vsock->queued_replies);
|
|
if (new_cnt + cnt >= tx_vq->num && new_cnt < tx_vq->num)
|
|
vhost_poll_queue(&tx_vq->poll);
|
|
}
|
|
|
|
ret = 0;
|
|
out:
|
|
rcu_read_unlock();
|
|
return ret;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
pkt->buf_len = pkt->len;
|
|
|
|
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 bool vhost_transport_seqpacket_allow(u32 remote_cid);
|
|
|
|
static struct virtio_transport vhost_transport = {
|
|
.transport = {
|
|
.module = THIS_MODULE,
|
|
|
|
.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,
|
|
.cancel_pkt = vhost_transport_cancel_pkt,
|
|
|
|
.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,
|
|
|
|
.seqpacket_dequeue = virtio_transport_seqpacket_dequeue,
|
|
.seqpacket_enqueue = virtio_transport_seqpacket_enqueue,
|
|
.seqpacket_allow = vhost_transport_seqpacket_allow,
|
|
.seqpacket_has_data = virtio_transport_seqpacket_has_data,
|
|
|
|
.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,
|
|
.notify_buffer_size = virtio_transport_notify_buffer_size,
|
|
|
|
},
|
|
|
|
.send_pkt = vhost_transport_send_pkt,
|
|
};
|
|
|
|
static bool vhost_transport_seqpacket_allow(u32 remote_cid)
|
|
{
|
|
struct vhost_vsock *vsock;
|
|
bool seqpacket_allow = false;
|
|
|
|
rcu_read_lock();
|
|
vsock = vhost_vsock_get(remote_cid);
|
|
|
|
if (vsock)
|
|
seqpacket_allow = vsock->seqpacket_allow;
|
|
|
|
rcu_read_unlock();
|
|
|
|
return seqpacket_allow;
|
|
}
|
|
|
|
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, pkts = 0, total_len = 0;
|
|
unsigned int out, in;
|
|
bool added = false;
|
|
|
|
mutex_lock(&vq->mutex);
|
|
|
|
if (!vhost_vq_get_backend(vq))
|
|
goto out;
|
|
|
|
if (!vq_meta_prefetch(vq))
|
|
goto out;
|
|
|
|
vhost_disable_notify(&vsock->dev, vq);
|
|
do {
|
|
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;
|
|
}
|
|
|
|
total_len += sizeof(pkt->hdr) + pkt->len;
|
|
|
|
/* Deliver to monitoring devices all received packets */
|
|
virtio_transport_deliver_tap_pkt(pkt);
|
|
|
|
/* Only accept correctly addressed packets */
|
|
if (le64_to_cpu(pkt->hdr.src_cid) == vsock->guest_cid &&
|
|
le64_to_cpu(pkt->hdr.dst_cid) ==
|
|
vhost_transport_get_local_cid())
|
|
virtio_transport_recv_pkt(&vhost_transport, pkt);
|
|
else
|
|
virtio_transport_free_pkt(pkt);
|
|
|
|
vhost_add_used(vq, head, 0);
|
|
added = true;
|
|
} while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len)));
|
|
|
|
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)
|
|
{
|
|
struct vhost_virtqueue *vq;
|
|
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++) {
|
|
vq = &vsock->vqs[i];
|
|
|
|
mutex_lock(&vq->mutex);
|
|
|
|
if (!vhost_vq_access_ok(vq)) {
|
|
ret = -EFAULT;
|
|
goto err_vq;
|
|
}
|
|
|
|
if (!vhost_vq_get_backend(vq)) {
|
|
vhost_vq_set_backend(vq, vsock);
|
|
ret = vhost_vq_init_access(vq);
|
|
if (ret)
|
|
goto err_vq;
|
|
}
|
|
|
|
mutex_unlock(&vq->mutex);
|
|
}
|
|
|
|
/* Some packets may have been queued before the device was started,
|
|
* let's kick the send worker to send them.
|
|
*/
|
|
vhost_work_queue(&vsock->dev, &vsock->send_pkt_work);
|
|
|
|
mutex_unlock(&vsock->dev.mutex);
|
|
return 0;
|
|
|
|
err_vq:
|
|
vhost_vq_set_backend(vq, NULL);
|
|
mutex_unlock(&vq->mutex);
|
|
|
|
for (i = 0; i < ARRAY_SIZE(vsock->vqs); i++) {
|
|
vq = &vsock->vqs[i];
|
|
|
|
mutex_lock(&vq->mutex);
|
|
vhost_vq_set_backend(vq, 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);
|
|
vhost_vq_set_backend(vq, NULL);
|
|
mutex_unlock(&vq->mutex);
|
|
}
|
|
|
|
err:
|
|
mutex_unlock(&vsock->dev.mutex);
|
|
return ret;
|
|
}
|
|
|
|
static void vhost_vsock_free(struct vhost_vsock *vsock)
|
|
{
|
|
kvfree(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 = kvmalloc(sizeof(*vsock), GFP_KERNEL | __GFP_RETRY_MAYFAIL);
|
|
if (!vsock)
|
|
return -ENOMEM;
|
|
|
|
vqs = kmalloc_array(ARRAY_SIZE(vsock->vqs), sizeof(*vqs), GFP_KERNEL);
|
|
if (!vqs) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
vsock->guest_cid = 0; /* no CID assigned yet */
|
|
|
|
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),
|
|
UIO_MAXIOV, VHOST_VSOCK_PKT_WEIGHT,
|
|
VHOST_VSOCK_WEIGHT, true, NULL);
|
|
|
|
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);
|
|
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_dev_flush(&vsock->dev);
|
|
}
|
|
|
|
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 the peer is still valid, no need to reset connection */
|
|
if (vhost_vsock_get(vsk->remote_addr.svm_cid))
|
|
return;
|
|
|
|
/* If the close timeout is pending, let it expire. This avoids races
|
|
* with the timeout callback.
|
|
*/
|
|
if (vsk->close_work_scheduled)
|
|
return;
|
|
|
|
sock_set_flag(sk, SOCK_DONE);
|
|
vsk->peer_shutdown = SHUTDOWN_MASK;
|
|
sk->sk_state = SS_UNCONNECTED;
|
|
sk->sk_err = ECONNRESET;
|
|
sk_error_report(sk);
|
|
}
|
|
|
|
static int vhost_vsock_dev_release(struct inode *inode, struct file *file)
|
|
{
|
|
struct vhost_vsock *vsock = file->private_data;
|
|
|
|
mutex_lock(&vhost_vsock_mutex);
|
|
if (vsock->guest_cid)
|
|
hash_del_rcu(&vsock->hash);
|
|
mutex_unlock(&vhost_vsock_mutex);
|
|
|
|
/* Wait for other CPUs to finish using vsock */
|
|
synchronize_rcu();
|
|
|
|
/* 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);
|
|
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 assigned to the guest->host transport (i.e. nested
|
|
* VM), to make the loopback work.
|
|
*/
|
|
if (vsock_find_cid(guest_cid))
|
|
return -EADDRINUSE;
|
|
|
|
/* Refuse if CID is already in use */
|
|
mutex_lock(&vhost_vsock_mutex);
|
|
other = vhost_vsock_get(guest_cid);
|
|
if (other && other != vsock) {
|
|
mutex_unlock(&vhost_vsock_mutex);
|
|
return -EADDRINUSE;
|
|
}
|
|
|
|
if (vsock->guest_cid)
|
|
hash_del_rcu(&vsock->hash);
|
|
|
|
vsock->guest_cid = guest_cid;
|
|
hash_add_rcu(vhost_vsock_hash, &vsock->hash, vsock->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)) {
|
|
goto err;
|
|
}
|
|
|
|
if ((features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) {
|
|
if (vhost_init_device_iotlb(&vsock->dev, true))
|
|
goto err;
|
|
}
|
|
|
|
if (features & (1ULL << VIRTIO_VSOCK_F_SEQPACKET))
|
|
vsock->seqpacket_allow = true;
|
|
|
|
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;
|
|
|
|
err:
|
|
mutex_unlock(&vsock->dev.mutex);
|
|
return -EFAULT;
|
|
}
|
|
|
|
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);
|
|
case VHOST_GET_BACKEND_FEATURES:
|
|
features = VHOST_VSOCK_BACKEND_FEATURES;
|
|
if (copy_to_user(argp, &features, sizeof(features)))
|
|
return -EFAULT;
|
|
return 0;
|
|
case VHOST_SET_BACKEND_FEATURES:
|
|
if (copy_from_user(&features, argp, sizeof(features)))
|
|
return -EFAULT;
|
|
if (features & ~VHOST_VSOCK_BACKEND_FEATURES)
|
|
return -EOPNOTSUPP;
|
|
vhost_set_backend_features(&vsock->dev, features);
|
|
return 0;
|
|
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 ssize_t vhost_vsock_chr_read_iter(struct kiocb *iocb, struct iov_iter *to)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct vhost_vsock *vsock = file->private_data;
|
|
struct vhost_dev *dev = &vsock->dev;
|
|
int noblock = file->f_flags & O_NONBLOCK;
|
|
|
|
return vhost_chr_read_iter(dev, to, noblock);
|
|
}
|
|
|
|
static ssize_t vhost_vsock_chr_write_iter(struct kiocb *iocb,
|
|
struct iov_iter *from)
|
|
{
|
|
struct file *file = iocb->ki_filp;
|
|
struct vhost_vsock *vsock = file->private_data;
|
|
struct vhost_dev *dev = &vsock->dev;
|
|
|
|
return vhost_chr_write_iter(dev, from);
|
|
}
|
|
|
|
static __poll_t vhost_vsock_chr_poll(struct file *file, poll_table *wait)
|
|
{
|
|
struct vhost_vsock *vsock = file->private_data;
|
|
struct vhost_dev *dev = &vsock->dev;
|
|
|
|
return vhost_chr_poll(file, dev, wait);
|
|
}
|
|
|
|
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,
|
|
.compat_ioctl = compat_ptr_ioctl,
|
|
.read_iter = vhost_vsock_chr_read_iter,
|
|
.write_iter = vhost_vsock_chr_write_iter,
|
|
.poll = vhost_vsock_chr_poll,
|
|
};
|
|
|
|
static struct miscdevice vhost_vsock_misc = {
|
|
.minor = VHOST_VSOCK_MINOR,
|
|
.name = "vhost-vsock",
|
|
.fops = &vhost_vsock_fops,
|
|
};
|
|
|
|
static int __init vhost_vsock_init(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = vsock_core_register(&vhost_transport.transport,
|
|
VSOCK_TRANSPORT_F_H2G);
|
|
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_unregister(&vhost_transport.transport);
|
|
};
|
|
|
|
module_init(vhost_vsock_init);
|
|
module_exit(vhost_vsock_exit);
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR("Asias He");
|
|
MODULE_DESCRIPTION("vhost transport for vsock ");
|
|
MODULE_ALIAS_MISCDEV(VHOST_VSOCK_MINOR);
|
|
MODULE_ALIAS("devname:vhost-vsock");
|