Virtualization of input/output devices in a logically...

Details Virtualization of input/output devices in a logically... Virtualization of input/output devices in a logically...

2005-09-13

2005-09-13

Vo, Ted T. (Department: 2192)

Data processing: software development, installation, and managem

Software program development tool

Managing software components

C709S226000

Reexamination Certificate

active

06944847

ABSTRACT:
A hypervisor (management) layer synchronizes use of virtualized input/output (I/O) devices that may regularly be used by multiple partitions of a logically partitioned data processing system by making them callable by any system partition to the hypervisor layer. A partition makes a call to the hypervisor to reserve an I/O resource. If the I/O resource is presently allocated to another partition when a call is made to reserve the resource, the hypervisor rejects the request to reserve the device. If the resource is available, the hypervisor issues a command to the resource to service calls made from the reserving partition. After utilizing the resource as necessary, the reserving partition releases control over the I/O device and sends a notification to hypervisor that it has released the I/O device. Upon release, the I/O device will automatically be available for use by another partition via a call to the hypervisor.

REFERENCES:
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patent: 5655076 (1997-08-01), Kimura et al.
patent: 6112263 (2000-08-01), Futral
Schimunek et al., “Slicing the AS/400 with Logical Partitioning: A How to Guide”, IBM RedBooks, http://www.redbooks.ibm.com, pp.: i-xviii, 1-219, Aug. 1999.

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