System and method for virtualizing computer systems

  • US 6,496,847 B1
  • Filed: 09/10/1998
  • Issued: 12/17/2002
  • Est. Priority Date: 05/15/1998
  • Status: Expired due to Term
First Claim
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1. A virtualization system for a computer, in whichthe computer includes a host processor, which has a processor state, physical system devices, and a host operating system (HOS), and the computer is operationally divided into a system level and a user level, the HOS is at the system level, the host processor accepting and carrying out a pre-determined set of privileged instruction calls only from sub-systems at the system level, the virtualization system comprising:

  • at least one virtual machine monitor (VMM) also at the system level, both the VMM and the HOS thus being able to independently issue both privileged and non-privileged instructions for execution by the processor and to independently modify the processor state.

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