-device usb-host,hostbus=1,hostport=6.1
-device usb-host,hostbus=1,hostport=6.2
-device usb-host,hostbus=1,hostport=6.3
-device usb-host,hostbus=1,hostport=6.4
-device vfio-pci,host=$GPU_ID,multifunction=on,id=gpu,romfile=$GPU_ROM
-device vfio-pci,host=$AUDIO_ID,id=audio