I've configured a network passtrough like this:
<source dev='eth1' mode='passthrough'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
OK. it works :)
There's only one small difficulty:
I have to make sure the host network interface is down before I start the VM.
Then, after the VM starts, I have to bring the host network interface up by hand.
If the host interface is up before the VM starts, the VM fails to start.
If I do not bring the host network interface up after the VM starts, the VM cannot effectively communicate using that network interface.
Does anybody has a "clean" solution for it, I mean: without employing some external "dirty" script or so?