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Performing a Configuration Virtual Topology Change and Instruction Therefore

  • US 20090182915A1
  • Filed: 01/11/2008
  • Published: 07/16/2009
  • Est. Priority Date: 01/11/2008
  • Status: Active Grant
First Claim
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1. In a logically partitioned host computer system comprising host processors (host CPUs), a method for a configuration change of a topology of a plurality of guest processors (guest CPUs) of a guest configuration, the method comprising:

  • a guest processor of the guest configuration fetching a perform topology function instruction defined for a computer architecture, the perform topology function instruction comprising an opcode field specifying a function to be performed;

    executing function to be performed of the perform topology function instruction comprising;

    requesting a specified polarization change of the configuration of the topology of the guest processors of the guest configuration;

    responsive to the requested specified polarization change being accepted, initiating a chang of the topology of the guest processors of the guest configuration according to the specified polarization change and setting a condition code to a first condition code value, the first condition code value indicating a topology-change initiated; and

    responsive to the requested specified polarization change not being accepted, setting the condition code to a second condition code value, the second condition code value indicating a topology-change is rejected.

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