1. In a logically partitioned host computer system comprising host processors (host CPUs), a method for discovering topology of one or more guest processors (guest CPUs) of a guest configuration, the method comprising: executing a STORE SYSTEM INFORMATION instruction by a logical processor of a logical partition, wherein the STORE SYSTEM INFORMATION instruction defined for a computer architecture is executed by a central processing unit of an alternate computer architecture, the execution comprising: obtaining topology information of the guest configuration wherein the topology information comprises nesting information of logical processors of the logical partition, the nesting information comprising an indication of a maximum number of containers for each nesting level, wherein a container specifies groups of processors or groups of containers; and storing the topology information in a configuration topology table.