On Wed, 12 Nov 2025 13:18:59 +0530, Srikar Dronamraju wrote:

quoted

From Power10 processors onwards, each chip has 2 hemispheres. For LPARs

running on PowerVM Hypervisor, hypervisor determines the allocation of
CPU groups to each LPAR, resulting in two LPARs with the same number of
CPUs potentially having different numbers of CPUs from each hemisphere.
Additionally, it is not feasible to ascertain the hemisphere based
solely on the CPU number.

[...]

Applied to powerpc/next.

[1/1] powerpc/smp: Expose die_id and die_cpumask
      https://git.kernel.org/powerpc/c/fb2ff9fa72e20a75cab0ffc9dc8735de68ed4d0d

Thanks