Re: [PATCH v13 4/7] s390x/cpu_topology: CPU topology migration

[Pierre Morel]

On 12/13/22 14:26, Christian Borntraeger wrote:
> Am 08.12.22 um 10:44 schrieb Pierre Morel:
> > The migration can only take place if both source and destination
> > of the migration both use or both do not use the CPU topology
> > facility.
> >
> > We indicate a change in topology during migration postload for the
> > case the topology changed between source and destination.
>
> I dont get why we need this? If the target QEMU has topology it should
> already create this according to the configuration. WHy do we need a
> trigger?

We do not.
The first idea was to migrate the topology with a dedicated object but 
after today discussion, it will be recreated by the admin on the target 
and the MTCR will not be migrated but simply set to 1 on target start.

So next spin will not get migration included.

Regards,
Pierre


--
Pierre Morel
IBM Lab Boeblingen