L0 (physycal host; RHEL 7.6):

    [root@shark13 ~]# rpm -q libvirt-daemon-kvm qemu-kvm-rhev; uname -r
    libvirt-daemon-kvm-4.5.0-10.el7_6.3.x86_64
    qemu-kvm-rhev-2.12.0-13.el7.x86_64
    3.10.0-957.1.3.el7.x86_64

L1 (source and destination hypervisors; F28):

    [root@guestHyp1 ~]# rpm -q libvirt-daemon-kvm qemu-system-x86; uname -r
    libvirt-daemon-kvm-4.10.0-2.fc28.x86_64
    qemu-system-x86-2.11.2-4.fc28.x86_64
    4.16.5-300.fc28.x86_64
    
    [root@guestHyp2 ~]# rpm -q libvirt-daemon-kvm qemu-system-x86; uname -r
    libvirt-daemon-kvm-4.10.0-2.fc28.x86_64
    qemu-system-x86-2.11.2-4.fc28.x86_64
    4.16.5-300.fc28.x86_64
    [root@guestHyp2 ~]#