Currently, when a user tries to live migrate a VM that owns a network interface that is configured via a net file descriptor (meaning VM is created with --net <net> fd=<fd1,fd2,...>), the live migration fails with following error.

There is recent support of using snapshot/restore of VMs that use net FDs documented here.

A similar mechanism could be implemented for live migration, were the receiver side needs to provide the expected Net FDs when doing the receive-migration api call:

ch-remote --api-socket=/tmp/api receive-migration tcp:0.0.0.0:{port} net_fds=[net1@[23,24],net2@[25,26]]