Restricting memory access to protect data when sharing a...

Details Restricting memory access to protect data when sharing a... Restricting memory access to protect data when sharing a...

2007-10-01

2009-02-03

Sough, Hyung S (Department: 2188)

Electrical computers and digital processing systems: memory

Storage accessing and control

Control technique

C711S006000, C711S150000, C711S151000, C711S158000

Reexamination Certificate

active

07487314

ABSTRACT:
A first software entity occupies a portion of a linear address space of a second software entity and prevents the second software entity from accessing the memory of the first software entity. For example, in one embodiment of the invention, the first software entity is a virtual machine monitor (VMM), which supports a virtual machine (VM), the second software entity. The VMM sometimes directly executes guest instructions from the VM and, at other times, the VMM executes binary translated instructions derived from guest instructions. When executing binary translated instructions, the VMM uses memory segmentation to protect its memory. When directly executing guest instructions, the VMM may use either memory segmentation or a memory paging mechanism to protect its memory. When the memory paging mechanism is active during direct execution, the protection from the memory segmentation mechanism may be selectively deactivated to improve the efficiency of the virtual computer system.

REFERENCES:
patent: 6671786 (2003-12-01), Wang et al.
patent: 6775754 (2004-08-01), Okaue et al.

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