Image ownership changes while mirgation live


Hi everyone. When I do migrate --live to migrate my virtual machine from one hypervisor (gv1) to another (gv2), it goes ok but in the end ownership of migrated vm image changes from libvirt-qemu:kvm to root:root even if I do migration under unprivileged user added to kvm group. And second hypervisor (gv2) has this directory mounted by NFS so image becomes RO for him and this is not good. My question is: how to make my first hypervisor not to change ownership of migrated vm image? I think it (gv1) does this nasty thing. Thanx for any ideas.