I restarted the server, with no change. I uninstalled and reinstalled libvirt, same result. I had a look at libvirt logs, there is nothing special. I tried several other things, with no luck. I check that "lshal" gives result : it is actually the case... I'll check that. However I don't know what happened with this last update, physical devices worked great before it... If what you say is right, it may be linked with some other update that occured at the same time... Thanks for you help!