[libvirt] Hide fully-virtualized network devices to domU with PV drivers

Hello, I have a problem with libvirt which I hope someone on this list might be able to help with. I have many DomU images which all have PV drivers loaded for network. I want to start these DomU guests with only the PV network device being visible from within the DomU. In testing I have been able to create the required system with the 'xm' command. The important part of the network line is "type=none". The complete line looks like: vif = [ "mac=00:16:3e:00:a5:57,bridge=eth0,script=vif-bridge,type=none" ] With libvirt I have tried adding "<model type='none'/>" into the interface section but this errors with "qemu: Unsupported NIC: none" so I'm obviously missing something obvious. The complete interface section looks like: <interface type='bridge'> <mac address='00:16:3e:00:a5:57'/> <source bridge='eth0'/> <target dev='vif9.0'/> <model type='none'/> </interface> I have been able to achieve the required configuration if I completely omit an 'interface' section and once the DomU has booted I use virsh to add an interface to the domain. Unfortunately if I then reboot the DomU the guest comes back up with two network interfaces visible to it and the qemu-dm line has added a "-net ...,model=rtl8139" option. Having hunted around I am yet to find a way to configure a domU in libvirt so the networking available to the guest is the way I require. As I can do this with xm, I'm hoping someone on this list can point me in the right direction to also do this with libvirt. Thanks in advance, Iain Watson