Re: [PATCH v10 6/9] s390x/cpu topology: add topology-disable machine property

[Cornelia Huck]

On Tue, Oct 18 2022, Cédric Le Goater <clg@kaod.org> wrote:

> On 10/12/22 18:21, Pierre Morel wrote:
>> S390 CPU topology is only allowed for s390-virtio-ccw-7.3 and
>> newer S390 machines.
>> We keep the possibility to disable the topology on these newer
>> machines with the property topology-disable.
>> 
>> Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
>> ---
>>   include/hw/boards.h                |  3 ++
>>   include/hw/s390x/cpu-topology.h    | 18 +++++++++-
>>   include/hw/s390x/s390-virtio-ccw.h |  2 ++
>>   hw/core/machine.c                  |  5 +++
>>   hw/s390x/s390-virtio-ccw.c         | 53 +++++++++++++++++++++++++++++-
>>   util/qemu-config.c                 |  4 +++
>>   qemu-options.hx                    |  6 +++-
>>   7 files changed, 88 insertions(+), 3 deletions(-)
>> 
>> diff --git a/include/hw/boards.h b/include/hw/boards.h
>> index 311ed17e18..67147c47bf 100644
>> --- a/include/hw/boards.h
>> +++ b/include/hw/boards.h
>> @@ -379,6 +379,9 @@ struct MachineState {
>>       } \
>>       type_init(machine_initfn##_register_types)
>>   
>> +extern GlobalProperty hw_compat_7_2[];
>> +extern const size_t hw_compat_7_2_len;
>
> QEMU 7.2 is not out yet.

Yes, and the introduction of the new compat machines needs to go into a
separate patch. I'm usually preparing that patch while QEMU is in
freeze, but feel free to cook up a patch earlier if you need it.

(...)

>> +static void ccw_machine_7_3_instance_options(MachineState *machine)
>> +{
>> +}
>> +
>> +static void ccw_machine_7_3_class_options(MachineClass *mc)
>> +{
>> +}
>> +DEFINE_CCW_MACHINE(7_3, "7.3", true);
>
> That's too early.

Also, the next QEMU version will be 8.0, not 7.3 :)