How to migrate foreign VM to CloudStack

[JohnnyZhao]

Dear Sir:
I have some questions about how to migrate foreign VM to cloudstack. If I have 
setup a cloudstack environment to manage one VMware vSphere Cluster with one 
vCenter and one KVM clusters, how to migrate the existing current VMs on 
vSphere Clusters into cloudstack? For example, I deploy new VM by vCenter, but 
CloudStack doesn't know it. How to migrate it into existing cloudstack 
environment? Thanks a lot!
RegardsJohnny Zhao