1. A method for controlling live migration of a virtual machine from a first host to a second host, comprising: determining, by a virtual machine manager, that the virtual machine will be migrated from the first host to the second host; and sending, by the virtual machine manager to at least a third host in a virtual network including the virtual machine, an updated mapping policy that maps a customer address of the virtual machine to a provider address of the migrated virtual machine on the second host.