Hi Maintainers, Currently libvirt could only parse commandline for several legacy devices. For example, -pcidevice: qemuParseCommandLinePCI() -usbdevice: qemuParseCommandLineUSB() It also provides test cases for host device assignment. DO_TEST("hostdev-usb-address"); DO_TEST("hostdev-pci-address"); But for other hostdev with -device option, it failed to convert into <hostdev> tag. -device vfio-pci,host=06:12.5,id=hostdev0,bus=pci.0,addr=0x3 $ virsh domxml-from-native qemu-argv kvm.args >kvm.xml <qemu:commandline> <qemu:arg value='-device'/> <qemu:arg value='vfio-pci,host=06:12.5,id=hostdev0,bus=pci.0,addr=0x3'/> </qemu:commandline> Expected XML file should like below: <hostdev mode='subsystem' type='pci' managed='yes'> <driver name='vfio'/> <source> <address domain='0x0000' bus='0x06' slot='0x12' function='0x5'/> </source> </hostdev> Maybe it is not very critical. Is it complicated to add support to -device option in function qemuParseCommandLine()? Do you have any thought or plan about it? Best Regards, Olivia