fn create_virtio_devices(
cfg: &Config,
vm: &mut impl Vm,
resources: &mut SystemAllocator,
vm_evt_wrtube: &SendTube,
balloon_device_tube: Option<Tube>,
balloon_inflate_tube: Option<Tube>,
init_balloon_size: u64,
disk_device_tubes: &mut Vec<Tube>,
pmem_device_tubes: &mut Vec<Tube>,
fs_device_tubes: &mut Vec<Tube>,
gpu_control_tube: Tube,
render_server_fd: Option<SafeDescriptor>,
registered_evt_q: &SendTube
) -> Result<Vec<VirtioDeviceStub>>