Starting with a new machine, s390-virtio-ccw-7.2, the machine
property topology-disable is set to false while it is kept to
true for older machine.
This allows migrating older machine without disabling the ctop
CPU feature for older machine, thus keeping existing start scripts.
The KVM capability, KVM_CAP_S390_CPU_TOPOLOGY is used to
activate the S390_FEAT_CONFIGURATION_TOPOLOGY feature and
the topology facility for the guest in the case the topology
is not disabled.
Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
---