Comment # 15 on bug 1174365 from James Fehlig

I'm not sure how to proceed with this issue. Klaus, did you check if session vs
system libvirtd for running VMs as a regular user satisfies your needs (see
comment #13)?

Also note that the system libvirtd starts VMs as the 'qemu' user and group. You
can change that to a user and group of your liking in /etc/libvirt/qemu.conf.
Beware a custom user and group must have appropriate rights, e.g. member of the
kvm group.