[ubuntu] VMM libvirtd/kvm pci passthrough: Unable to read from monitor

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http://ubuntuforums.org – I am having trouble getting any pci devices to pass through to guests from ubuntu 12.04 server. I have three devices and am trying to pass them through from VMM GUI. The VM will boot fine without any pci devices assigned to it and has bridge network connection. As soon as I attempt to pass through a PCI device I get the following error on boot: Error starting domain: Unable to read from monitor: Connection reset by peer Traceback (most recent call last): File "/usr/share/virt-manager/virtManager/asyncjob.py", line 45, in cb_wrapper callback(asyncjob, *args, **kwarg (Hardware)