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Method for controlling a shared resource in an LPAR environment

IP.com Disclosure Number: IPCOM000235616D
Publication Date: 2014-Mar-13
Document File: 1 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for controlling a hardware resource in a Logical Partition (LPAR) environment wherein the resource is not equally accessible or controllable by the LPARs.

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Method for controlling a shared resource in an LPAR environment

In a Logical Partition (LPAR) environment, hardware resources can be shared amongst the LPARs. Situations arise where a resource is accessible by more than one LPAR, but only controllable by a single LPAR. The term, "accessible", is used here to imply that an LPAR can read status on the resource or set restricted registers on the resource, but it cannot instruct the resource to perform some action. The term, "controllable", is used here to imply that an LPAR can instruct the resource to perform an action.

Making the resource equally accessible and controllable by all LPARs is one possible solution, but this is not always feasible or cost effective.

This disclosure offers a solution for controlling a hardware resource in an LPAR environment where the resource is not equally accessible or controllable by the LPARs. When an LPAR not having control capability of a resource needs to request an action by that resource, it sets a status bit on the resource. In addition, the LPAR having control capability of the resource detects a status bit change and invokes the appropriate action on the resource.

This method provides a simple and cost effective design, over adding complexity to the LPARs and hardware resources, so that the resources can be controlled by multiple LPARs.

The resource to be controlled must contain registers that can be set by LPARs having access to the resource. The "controlling" LPAR must...