[libvirt] virDomanMigrate on kvm fails

virDomainMigrate fails when the domain is a kvm guest. The error message is "this function is not supported by the hypervisor: virDomainMigrate." I tried migrating with virsh but it says it can not connected to the destination host. I have successfully created copies of the same image on both so that is not the problem. I hava also booted the same hosts with xen and virDomainMigrate worked. What do you think the problem is? Kenneth Nagin