Maintaining reverse mappings in a virtualized computer system
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United States of America Patent
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Apr 2, 2013
Grant Date -
Nov 10, 2011
app pub date -
Jul 19, 2011
filing date -
Mar 31, 2006
priority date (Note) -
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status (Latency Note)
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Abstract
For a virtual memory of a virtualized computer system in which a virtual page is mapped to a guest physical page which is backed by a machine page and in which a shadow page table entry directly maps the virtual page to the machine page, reverse mappings of guest physical pages are optimized by removing the reverse mappings of certain immutable guest physical pages. An immutable guest physical memory page is identified, and existing reverse mappings corresponding to the immutable guest physical page are removed. New reverse mappings corresponding to the identified immutable guest physical page are no longer added.
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