yum downgrade -y qemu-img-ev-2.3.0-31.el7.16.1.x86_64.rpm  qemu-kvm-common-ev-2.3.0-31.el7.16.1.x86_64.rpm  qemu-kvm-ev-2.3.0-31.el7.16.1.x86_64.rpm  qemu-kvm-tools-ev-2.3.0-31.el7.16.1.x86_64.rpm

sleep 2
systemctl restart libvirtd
sleep 2
systemctl restart openstack-nova-compute
sleep 2
systemctl status libvirtd
sleep 2
systemctl status openstack-nova-compute
sleep 2
/usr/libexec/qemu-kvm  --version
