Electrical computers and digital processing systems: memory – Storage accessing and control – Shared memory area
Reexamination Certificate
2007-09-25
2007-09-25
Ellis, Kevin L. (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Shared memory area
C711S138000, C711S152000
Reexamination Certificate
active
11494347
ABSTRACT:
In a computer system with a non-segmented, region-based memory architecture, such as Intel IA-64 systems, two or more sub-systems share a resource, such as a virtual-to-physical address mapping and need to have overlapping regions of the virtual address space for accessing different physical addresses. Virtual addresses include a portion that is used to identify which region the issuing sub-system wants to access. For example, the region-identifying portion of virtual addresses may select a region register whose contents point to a virtual-to-physical address mapping for the corresponding region. To protect a second sub-system S2from a first S1, whenever the S1issues an address in a region occupied by S2, the region for the S2is changed. This allows S1to issue its addresses without change. In a preferred embodiment of the invention, S2is a virtual machine monitor (VMM) and S1is a virtual machine running on the VMM.
REFERENCES:
patent: 6075938 (2000-06-01), Bugnion et al.
patent: 2003/0084256 (2003-05-01), McKee
patent: 2003/0115578 (2003-06-01), Liokumovich et al.
Doan Duc T.
Ellis Kevin L.
Pearce Jeffrey
Smith Darryl A.
VMware, Inc.
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