Re: [PATCH] target/s390x: Add a CONFIG switch to disable legacy CPUs

[Christian Borntraeger]

Am 13.06.24 um 19:07 schrieb Thomas Huth:
> Old CPU models are not officially supported anymore by IBM, and for
> downstream builds of QEMU, we would like to be able to disable these
> CPUs in the build. Thus add a CONFIG switch that can be used to
> disable these CPUs (and old machine types that use them by default).
>
> Signed-off-by: Thomas Huth <thuth@redhat.com>
> ---
>   If you're interested, the PDF that can be downloaded from
>   https://www.ibm.com/support/pages/ibm-mainframe-life-cycle-history
>   shows the supported CPUs in a nice diagram

z13 is still supported so the patch needs to be fixed at least.
Furthermore, z14 has the IBC/VAL cabability to behave like a z13,
same for z15. (we do support VAL to N-2)

I fail to see the value of this given how stable this code is.