KVM: s390: resetting the Topology-Change-Report

KVM: s390: resetting the Topology-Change-Report

During a subsystem reset the Topology-Change-Report is cleared.

Let's give userland the possibility to clear the MTCR in the case
of a subsystem reset.

To migrate the MTCR, we give userland the possibility to
query the MTCR state.

We indicate KVM support for the CPU topology facility with a new
KVM capability: KVM_CAP_S390_CPU_TOPOLOGY.

Signed-off-by: Pierre Morel <[email protected]>
Reviewed-by: Janis Schoetterl-Glausch <[email protected]>
Reviewed-by: Janosch Frank <[email protected]>
Message-Id: <20220714194334[email protected]>
Link: https://lore.kernel.org/all/[email protected]/
[[email protected]: Simple conflict resolution in Documentation/virt/kvm/api.rst]
Signed-off-by: Janosch Frank <[email protected]>