Data processing system for keeping isolation between logical...

Details Data processing system for keeping isolation between logical... Data processing system for keeping isolation between logical...

2011-07-05

2011-07-05

Chen, Alan (Department: 2182)

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral configuration

C710S003000, C710S020000, C710S036000, C710S062000, C711S100000, C714S001000, C714S006130, C714S053000

Reexamination Certificate

active

07975076

ABSTRACT:
When a subject of access of a transaction from an IO device is not any resource allocated to a logical partition to which the device having issued the transaction belongs, a report as an error is sent to a CPU, while the transaction is finished on the IO bus. To prevent a transaction between IO devices from gaining access to any resource in another logical partition, one access permission bit is provided for each combination of all the IO devices, and the access is permitted only when the bit has a predetermined value. A reset signal is provided by IO slot so that only an IO slot allocated to a specific logical partition can be reset without affecting any other logical partition. A transaction issued from an IO device in one logical partition is prevented from gaining access to a resource in another logical partition, while proper error handling can be performed.

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Japanese Office Action dated Nov. 13, 2007 regarding Japanese Patent Application No. 2003-005241, in Japanese.

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