Comment 6 for bug 1621076

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Daniel Berrange (berrange) wrote :

This is due to nova violating the libvirt XML contract for virDomainDetachDevice.

You are required to provide the full <interface> XML as currently shown in the *live* guest XML.

Nova doesn't do this, instead it builds new minimal <interface> XML from scatch. Thus nova is missing the PCI device information that libvirt would use to uniquely identify devices.