[Libvir] Is it possible to add an interface to intercept the migration process?

[Meng Ran]

Hi All,

I'm thinking about if it possible to add an interface to let user 
specified action to happen on destination during the migration, this 
should be useful for migrating things that have different paths on 
source and destination.

Allowing specified action(callback) to happen at a time point, e.g., 
after the config file is transfered and before starting the vm, can 
bring in a lot of flexibilities considering the migration of devices 
which are shared but have different paths/views. Giving the dest a 
chance to recognize these devices and update the config, and then start 
the vm probably is helpful there.

Comment?

Thanks,
Jack