pub fn create_gpu_device(
cfg: &Config,
exit_evt_wrtube: &SendTube,
gpu_control_tube: Tube,
resource_bridges: Vec<Tube>,
render_server_fd: Option<SafeDescriptor>,
has_vfio_gfx_device: bool,
event_devices: Vec<EventDevice>
) -> Result<VirtioDeviceStub>