1. A computer system comprising: a processor to execute a first virtual machine monitor (VMM), and a second VMM, the processor comprising a first storage structure to store a location of a domain specifier of the second VMM; and a memory to store a virtual machine control structure (VMCS) including state information pertaining to the first and second VMMs if a transition between the first and the second VMMs occurs; wherein the second VMM is to be provided with a pointer to the VMCS after program control has been transitioned to the second VMM.