Apparatus and method for sharing a network I/O adapter between logical partitions
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United States of America Patent
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Jun 3, 2008
Grant Date -
Sep 15, 2005
app pub date -
Mar 11, 2004
filing date -
Mar 11, 2004
priority date (Note) -
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Abstract
An I/O adapter sharing mechanism in a logically partitioned computer system allows sharing a network I/O adapter between logical partitions in an efficient manner. A first logical partition owns (or controls) the I/O adapter, and a second logical partition desires to use (or share) the I/O adapter. An I/O adapter device driver that includes a hardware interface is provided in the first logical partition. A virtual device driver is provided in the second logical partition that provides a set of functions that is at least partially defined by querying the I/O adapter device driver in the first logical partition. The I/O adapter sharing mechanism includes a transfer mechanism that allows data to be transferred directly from the virtual device driver in the second logical partition to the I/O adapter without passing through the I/O adapter device driver in the first logical partition.
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