1. A method for a cloud computing environment to facilitate migration of a virtual machine from a host computing system to the cloud computing environment, the method comprising the following for at least one virtual machine: an act maintaining a localized virtual machine state portion of a virtual machine in a cloud computing environment that is external to a host computing system that hosts the virtual machine; an act of determining a location of a centralized virtual machine state portion that is accessible to the host computing system and the cloud computing environment; in response to determining that migration of the virtual machine from the host computing system to the cloud computing environment is to occur, performing the following: an act of correlating the centralized virtual machine state portion with the localized virtual machine portion; and an act of instantiating the virtual machine in the cloud computing environment using the centralized virtual machine state and the localized virtual machine state.