qemu 初始化流程

subgraph netdev_init {
    label="netdev 初始化";
    cluster=true;
    net_init_netdev
    -> net_client_init
    -> visit_type_Netdev
}

subgraph chardev_init {
    label="chardev 初始化";
    cluster=true;
    chardev_init_func
        -> qemu_chr_new_from_opts
        -> qemu_chardev_new
        -> chardev_new
        -> qemu_char_open
        -> qmp_chardev_open_socket
        -> qmp_chardev_open_socket_server
        -> tcp_chr_accept_server_sync
        -> qio_net_listener_wait_client
        -> g_main_loop_run
}

subgraph virtio_net_init {
    label="virtio_net设备初始化";
    cluster=true;
    virtio_net_pci_instance_init
}

subgraph vhost_user_init {
    label="qemu vhost_user 初始化";
    cluster=true;
    net_init_vhost_user -> net_vhost_user_init
                        -> qemu_chr_fe_set_handlers
                        -> qemu_chr_fe_set_handlers_full
                        -> qemu_chr_be_event
                        -> chr_be_event
                        -> net_vhost_user_event
                        -> vhost_user_start
                        -> vhost_net_init
                        -> vhost_dev_init[weight=500]
                           vhost_dev_init
                        -> vhost_set_backend_type[label="根据backend_type设置vhost_ops为user_ops"]
    net_vhost_user_init -> qemu_chr_fe_init[label="关联vhost user 与 chrdev"]
}

subgraph vhost_user_negotiation {
    label="vhost_user 协商";
    cluster=true;
    //vhost_dev_init ->
    vhost_dev_init -> vhost_backend_init[label="1"]
        vhost_backend_init -> vhost_user_get_features
        vhost_backend_init -> vhost_user_set_protocol_features
    vhost_dev_init -> vhost_set_owner[label="2"]
    vhost_dev_init -> vhost_get_features[label="3"]
    vhost_dev_init -> vhost_virtqueue_init[label="4"]
                      vhost_virtqueue_init
                   -> vhost_user_set_vring_call

    //vhost_net_init ->
}

subgraph vdpa_restart {
    label="vdpa_重启";
    cluster=true;
    net_vhost_user_init -> qemu_chr_fe_wait_connected[label="vdpa 重启逻辑"]
                           qemu_chr_fe_wait_connected
                        -> vhost_dev_init
}

qemu_init -> qemu_create_early_backends[label="创建chardev 并等待连接"]
             qemu_create_early_backends
          -> qemu_opts_foreach
          -> chardev_init_func

qemu_init -> qemu_create_late_backends
          -> net_init_clients
          -> qemu_opts_foreach
          -> net_init_netdev
          -> net_client_init1
          -> net_client_init_fun
          -> net_init_vhost_user

qemu_init -> qmp_x_exit_preconfig
          -> qemu_create_cli_devices
          -> qemu_opts_foreach
          -> device_init_func
          -> qdev_device_add
          -> qdev_device_add_from_qdict
          -> qdev_new
          -> object_new
             object_new
          -> virtio_net_pci_instance_init

qmp_x_exit_preconfig
          -> qemu_init_board[label="初始化cpu内存"]

//vhost_dev_init

//net_vhost_user_event

//vhost_user_one_time_request

}