1. A method, comprising: executing an operating system (OS) on one or more processors of a computer system; executing a type 2 virtual machine monitor (VMM) on the one or more processors from the OS to isolate the OS from the one or more processors, wherein the executing a type 2 VMM includes, saving a current state of the one or more processors as a first state, halting execution of the OS on the one or more processors, and reconfiguring the one or more processors to a second state in which to permit a type 1 VMM to access physical resources of the computer, while execution of the OS is halted and subsequent to saving the first state, and passing the saved first state to the type 1 VMM while execution of the OS is halted; and launching the type 1 VMM on the one or more processors from the type 2 VMM while execution of the OS is halted and subsequent to reconfiguring the one or more processors to the second state, to access the physical resources of the computer system while execution of the OS is halted.