Method, apparatus, and computer program product for migrating data pages by disabling selected DMA operations in a physical I/O adapter
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United States of America Patent
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Aug 11, 2009
Grant Date -
Aug 10, 2006
app pub date -
Feb 3, 2005
filing date -
Feb 3, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method, apparatus, and computer program product are disclosed in a data processing system for migrating data pages subject to DMA access by temporarily disabling selected DMA operations within a physical I/O adapter. A determination is made as to whether to disable data access DMA capabilities of the physical I/O adapter. An operating mode of the physical I/O adapter is set to a particular mode utilizing a mode bit according to the determination of whether to disable data access DMA capabilities. Only data access DMA capabilities of the physical I/O adapter are disabled when the mode bit is set. Administrative services operations continue to be performed by the physical I/O adapter when the data access DMA capabilities of the physical I/O adapter are disabled.
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