I wanted to try libvirtd with virt-manager (I wanted to test migration.) on a virtual machine (without nested virtualization support enabled, so no kvm...), and I expected it to work (and use full emulation, qemu), but instead i receive the following error:
The qemu package is installed. Target is Ubuntu 14.04.2 LTS.
Is this not a supported scenario?
When connecting to a host libvirtd can use a default path for the connection. if i remember that right :///system will be fine, whereas i.e. :///xapi would expect a specific listener.
I have tried again from scratch, and could not reproduce the original issue. This time it it all just worked after installing the libvirt-bin and the qemu packages on the remote machine.
So, it appears that this is indeed a supported scenario.