Protection ring extension for computers having distinct virtual

Details Protection ring extension for computers having distinct virtual Protection ring extension for computers having distinct virtual

1994-03-22

1996-05-28

Kim, Ken S.

Boots, shoes, and leggings

395375, 395478, 39518401, 395800, 395416, 364DIG1, G06F 1214

Patent

active

055220754

ABSTRACT:
In a system for implementing virtual machines a Virtual Machine Monitor (VMM) is assigned an address space separate and distinct from the address space assigned to the virtual machines (VMs). A VM-bit is used to determine whether the processor is executing a process in the VM or the VMM. Through the use of the separate address spaces and the VM-bit a system is disclosed wherein the VMM can take full advantage of all the protection rings offered by the system on which it runs and the VMs are also allowed to operate in an environment that essentially offers the same number of real protection rings as are available on the underlying computer system.

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patent: 4975836 (1990-12-01), Hirosawa et al.
patent: 5088031 (1992-02-01), Takasaki et al.

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