Migration script to run on the source hypervisor

migrate_source.sh

#!/bin/bash

DOMAIN=vm-01
PF=ens6np0
VF=ens6v1             # VF attached to the bridge.
VF_NUM=1
TAP_IF=vmtap01        # virtio-net interface in the VM.
VF_XML=vf.xml

MAC=52:54:00:00:12:53
ZERO_MAC=00:00:00:00:00:00

# Set the virtio-net interface up.
virsh domif-setlink $DOMAIN $TAP_IF up

# Remove the VF that was passthrough'd to the VM.
virsh detach-device --live --config $DOMAIN $VF_XML

ip link set $PF vf $VF_NUM mac $ZERO_MAC

# Add FDB entry for traffic to continue going to the VM via
# the VF -> br0 -> vnet interface path.
bridge fdb add $MAC dev $VF
bridge fdb add $MAC dev $TAP_IF master

# Migrate the VM
virsh migrate --live --persistent $DOMAIN qemu+ssh://$REMOTE_HOST/system

# Clean up FDB entries after migration completes.
bridge fdb del $MAC dev $VF
bridge fdb del $MAC dev $TAP_IF master