1. A method comprising: modifying a hypercall interface of a first virtual machine monitor (VMM) to support a virtual machine (VM) fork hypercall; capturing a runtime image of the VM in response to the VM fork hypercall issued by the VM to a first VMM of a first host platform of a VM cluster environment; and loading the runtime image of the VM on a second host platform of the VM cluster environment, the second host platform having a second VMM, wherein loading the runtime image comprises issuing a VM clone command by the first VMM to the second VMM of the second host platform.