1 /* 2 * Sharing QEMU devices via vhost-user protocol 3 * 4 * Copyright (c) Coiby Xu <coiby.xu@gmail.com>. 5 * Copyright (c) 2020 Red Hat, Inc. 6 * 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. 9 */ 10 11 #ifndef VHOST_USER_SERVER_H 12 #define VHOST_USER_SERVER_H 13 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 "qemu/error-report.h" 19 #include "qapi/error.h" 20 #include "standard-headers/linux/virtio_blk.h" 21 22 /* A kick fd that we monitor on behalf of libvhost-user */ 23 typedef struct VuFdWatch { 24 VuDev *vu_dev; 25 int fd; /*kick fd*/ 26 void *pvt; 27 vu_watch_cb cb; 28 QTAILQ_ENTRY(VuFdWatch) next; 29 } VuFdWatch; 30 31 /** 32 * VuServer: 33 * A vhost-user server instance with user-defined VuDevIface callbacks. 34 * Vhost-user device backends can be implemented using VuServer. VuDevIface 35 * callbacks and virtqueue kicks run in the given AioContext. 36 */ 37 typedef struct { 38 QIONetListener *listener; 39 QEMUBH *restart_listener_bh; 40 AioContext *ctx; 41 int max_queues; 42 const VuDevIface *vu_iface; 43 44 /* Protected by ctx lock */ 45 VuDev vu_dev; 46 QIOChannel *ioc; /* The I/O channel with the client */ 47 QIOChannelSocket *sioc; /* The underlying data channel with the client */ 48 QTAILQ_HEAD(, VuFdWatch) vu_fd_watches; 49 50 Coroutine *co_trip; /* coroutine for processing VhostUserMsg */ 51 } VuServer; 52 53 bool vhost_user_server_start(VuServer *server, 54 SocketAddress *unix_socket, 55 AioContext *ctx, 56 uint16_t max_queues, 57 const VuDevIface *vu_iface, 58 Error **errp); 59 60 void vhost_user_server_stop(VuServer *server); 61 62 void vhost_user_server_attach_aio_context(VuServer *server, AioContext *ctx); 63 void vhost_user_server_detach_aio_context(VuServer *server); 64 65 #endif /* VHOST_USER_SERVER_H */ 66