Executing an instruction for performing a configuration virtual topology change

摘要

In a logically partitioned host computer system comprising host processors (host CPUs) partitioned into a plurality of guest processors (guest CPUs) of a guest configuration, a perform topology function instruction is executed by a guest processor specifying a topology change of the guest configuration. The topology change preferably changes the polarization of guest CPUs, the polarization related to the amount of a host CPU resource is provided to a guest CPU.

主权项

1. A computer program product, the computer program product comprising a tangible storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
executing, by a processor a perform topology function instruction for requesting a configuration change of a topology of a plurality of first processors (CPUs) of a first configuration, the execution comprising: any one of initiating a change of a polarization of the processors of the first configuration according to a requested polarization change or rejecting the requested polarization change; and setting a condition code, by the processor, to a value indicating whether a polarization change is any one of initiated or rejected, wherein the condition code of an instruction set architecture provides branching criterion for branch on condition instructions.