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We report a topology change to the guest for any CPU hotplug. The reporting to the guest is done using the Multiprocessor Topology-Change-Report (MTCR) bit of the utility entry in the guest's SCA which will be cleared during the interpretation of PTF. On every vCPU creation we set the MCTR bit to let the guest know the next time it uses the PTF with command 2 instruction that the topology changed and that it should use the STSI(15.1.x) instruction to get the topology details. STSI(15.1.x) gives information on the CPU configuration topology. Let's accept the interception of STSI with the function code 15 and let the userland part of the hypervisor handle it when userland supports the CPU Topology facility. Signed-off-by: Pierre Morel <pmorel@linux.ibm.com> Reviewed-by: Nico Boehr <nrb@linux.ibm.com> Reviewed-by: Janis Schoetterl-Glausch <scgl@linux.ibm.com> Reviewed-by: Janosch Frank <frankja@linux.ibm.com> Link: https://lore.kernel.org/r/20220714101824.101601-2-pmorel@linux.ibm.com Message-Id: <20220714101824.101601-2-pmorel@linux.ibm.com> Signed-off-by: Janosch Frank <frankja@linux.ibm.com> |
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