| 摘要 |
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 S 2 from a first S 1 , whenever the S 1 issues an address in a region occupied by S 2 , the region for the S 2 is changed. This allows S 1 to issue its addresses without change. In a preferred embodiment of the invention, S 2 is a virtual machine monitor (VMM) and S 1 is a virtual machine running on the VMM.
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