Controlling access to pages in a memory in a computing device
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United States of America Patent
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Jan 1, 2019
Grant Date -
Feb 1, 2018
app pub date -
Jul 29, 2016
filing date -
Jul 29, 2016
priority date (Note) -
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status (Latency Note)
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Abstract
The described embodiments perform a method for handling memory accesses by virtual machines in a computing device. The described embodiments include a reverse map table (RMT) and a separate guest accessed pages table (GAPT) for each virtual machine. The RMT has a plurality of entries, each entry including information for identifying a virtual machine that is permitted to access an associated page of data in a memory. Each GAPT has a record of pages being accessed by a corresponding virtual machine. During operation, a table walker receives a request from a given virtual machine to translate a guest physical address to a system physical address. The table walker checks at least one of the RMT and a corresponding GAPT to determine whether the given virtual machine has access to a corresponding page. If not, the table walker terminates the translating. Otherwise, the table walker completes the translating.
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