Splitting direct memory access windows
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United States of America Patent
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Jul 28, 2015
Grant Date -
Feb 26, 2015
app pub date -
Aug 22, 2013
filing date -
Aug 22, 2013
priority date (Note) -
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status (Latency Note)
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Abstract
A computing device may split a translation table used when performing a DMA operation into two different translation tables. To split the translation table, the computing device may update the registers in the IOMMU to include pointers to the two different translation tables. For example, the IOMMU may update one register to point to the same starting address as the original translation table but assign a shorter length (i.e., fewer entries) to that table. The extra entries may then be used to form the other translation table by adding a new pointer to one of the IOMMU registers. The two translation tables may be owned by the same service provider or two different service providers. Alternatively, the computing device may assign the two tables to the same service provider which in turn assigns the tables to respective client devices executed by the service provider.
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