2 * Sharing QEMU devices via vhost-user protocol
4 * Copyright (c) Coiby Xu <coiby.xu@gmail.com>.
5 * Copyright (c) 2020 Red Hat, Inc.
7 * This work is licensed under the terms of the GNU GPL, version 2 or
8 * later. See the COPYING file in the top-level directory.
11 #ifndef VHOST_USER_SERVER_H
12 #define VHOST_USER_SERVER_H
14 #include "subprojects/libvhost-user/libvhost-user.h" /* only for the type definitions */
15 #include "io/channel-socket.h"
16 #include "io/channel-file.h"
17 #include "io/net-listener.h"
18 #include "qapi/error.h"
19 #include "standard-headers/linux/virtio_blk.h"
21 /* A kick fd that we monitor on behalf of libvhost-user */
22 typedef struct VuFdWatch {
27 QTAILQ_ENTRY(VuFdWatch) next;
32 * A vhost-user server instance with user-defined VuDevIface callbacks.
33 * Vhost-user device backends can be implemented using VuServer. VuDevIface
34 * callbacks and virtqueue kicks run in the given AioContext.
37 QIONetListener *listener;
38 QEMUBH *restart_listener_bh;
41 const VuDevIface *vu_iface;
43 unsigned int in_flight; /* atomic */
45 /* Protected by ctx lock */
46 bool in_qio_channel_yield;
49 QIOChannel *ioc; /* The I/O channel with the client */
50 QIOChannelSocket *sioc; /* The underlying data channel with the client */
51 QTAILQ_HEAD(, VuFdWatch) vu_fd_watches;
53 Coroutine *co_trip; /* coroutine for processing VhostUserMsg */
56 bool vhost_user_server_start(VuServer *server,
57 SocketAddress *unix_socket,
60 const VuDevIface *vu_iface,
63 void vhost_user_server_stop(VuServer *server);
65 void vhost_user_server_inc_in_flight(VuServer *server);
66 void vhost_user_server_dec_in_flight(VuServer *server);
67 bool vhost_user_server_has_in_flight(VuServer *server);
69 void vhost_user_server_attach_aio_context(VuServer *server, AioContext *ctx);
70 void vhost_user_server_detach_aio_context(VuServer *server);
72 #endif /* VHOST_USER_SERVER_H */