On 09.08.2017 15:01, Cornelia Huck wrote:
> On Fri, 21 Jul 2017 14:56:08 +0200
> David Hildenbrand <da...@redhat.com> wrote:
> Finally got around to that one...
>> The STFLE bits for the MSA (extension) facilities simply indicate that
>> the respective instructions can be executed. The QUERY subfunction can then
>> be used to identify which features exactly are available.
>> Availability of subfunctions can also vary on real hardware. For now, we
>> simply implement a CPU model without any available subfunctions except
>> QUERY (which is always around).
>> As all MSA functions behave quite similarly, we can use one translation
>> handler for now. Prepare the code for implementation of actual subfunctions.
> Sounds reasonable.
>> At least MSA is helpful for now, as older Linux kernels require this
>> facility when compiled for a z9 model. Allow to enable the facilities
>> for the qemu cpu model.
> Do you remember which kernels?

Basically everything before kernel version 4.13 - the patch to lift this
requirement has just been merged very recently:



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