Another note: I am using a remote connection over ssh from virt-manager to the kvm system. virt-manager behaves differently when run locally - it finds the interfaces (presumably it detects them directly rather than querying the hypervisor?).
Another note: I am using a remote connection over ssh from virt-manager to the kvm system. virt-manager behaves differently when run locally - it finds the interfaces (presumably it detects them directly rather than querying the hypervisor?).