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Re: [PATCH v1 2/9] s390x: toplogy: adding drawers and books to smp parsi

From: Pierre Morel
Subject: Re: [PATCH v1 2/9] s390x: toplogy: adding drawers and books to smp parsing
Date: Tue, 20 Jul 2021 10:46:31 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0

On 7/20/21 10:20 AM, Cornelia Huck wrote:
On Tue, Jul 20 2021, Pierre Morel <pmorel@linux.ibm.com> wrote:

On 7/19/21 5:50 PM, Cornelia Huck wrote:
On Fri, Jul 16 2021, Daniel P. Berrangé <berrange@redhat.com> wrote:
Is the book/drawer thing architecture specific, or is it machine
type / CPU specific. ie do /all/ the s390x machine types / CPUS
QEMU support the book/drawer concept, or only a subset.

Should not be by machine type, but might be by cpu model (e.g. older
hardware lacking the needed support for exposing this to the guest.) IBM
folks, please correct me if I'm wrong.

Looks correct to me this is an information indicated by a facility
introduced with Z10 if I do not make an error.

Hm. Would that become a problem if we made availability of parameters
dependent upon a value in the machine (see the other thread I cc:ed you

The parameter can always be there, it is just that with older cpu model we will not report the topology information to the guest.

The discussion on dies and on smp_dies_supported in this thread will be interesting to follow because in my opinion dies for X or books/drawers for Z are to be treated equally.


Pierre Morel
IBM Lab Boeblingen

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