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/*
* Sharing QEMU devices via vhost-user protocol
*
* Copyright (c) Coiby Xu <coiby.xu@gmail.com>.
* Copyright (c) 2020 Red Hat, Inc.
*
* This work is licensed under the terms of the GNU GPL, version 2 or
* later. See the COPYING file in the top-level directory.
*/
#ifndef VHOST_USER_SERVER_H
#define VHOST_USER_SERVER_H
#include "subprojects/libvhost-user/libvhost-user.h" /* only for the type definitions */
#include "io/channel-socket.h"
#include "io/channel-file.h"
#include "io/net-listener.h"
#include "qemu/error-report.h"
#include "qapi/error.h"
#include "standard-headers/linux/virtio_blk.h"
/* A kick fd that we monitor on behalf of libvhost-user */
typedef struct VuFdWatch {
VuDev *vu_dev;
int fd; /*kick fd*/
void *pvt;
vu_watch_cb cb;
QTAILQ_ENTRY(VuFdWatch) next;
} VuFdWatch;
/**
* VuServer:
* A vhost-user server instance with user-defined VuDevIface callbacks.
* Vhost-user device backends can be implemented using VuServer. VuDevIface
* callbacks and virtqueue kicks run in the given AioContext.
*/
typedef struct {
QIONetListener *listener;
QEMUBH *restart_listener_bh;
AioContext *ctx;
int max_queues;
const VuDevIface *vu_iface;
/* Protected by ctx lock */
unsigned int refcount;
bool wait_idle;
VuDev vu_dev;
QIOChannel *ioc; /* The I/O channel with the client */
QIOChannelSocket *sioc; /* The underlying data channel with the client */
QTAILQ_HEAD(, VuFdWatch) vu_fd_watches;
Coroutine *co_trip; /* coroutine for processing VhostUserMsg */
} VuServer;
bool vhost_user_server_start(VuServer *server,
SocketAddress *unix_socket,
AioContext *ctx,
uint16_t max_queues,
const VuDevIface *vu_iface,
Error **errp);
void vhost_user_server_stop(VuServer *server);
void vhost_user_server_ref(VuServer *server);
void vhost_user_server_unref(VuServer *server);
void vhost_user_server_attach_aio_context(VuServer *server, AioContext *ctx);
void vhost_user_server_detach_aio_context(VuServer *server);
#endif /* VHOST_USER_SERVER_H */
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