NACK/Cmnt: [SRU][J][PATCH 0/1] [UBUNTU 22.04] Support CPU-MF Counters for new IBM z17 - kernel part (LP: #2121811)

[Stefan Bader]

On 04/09/2025 14:18, Massimiliano Pellizzer wrote:
> BugLink: https://bugs.launchpad.net/bugs/2121811
> 
> [ Impact ]
> 
> s390/cpumf: Update CPU Measurement facility extended counter set support
> 
> Update CPU Measurement counter facility support for the
> extended counter set for machine types 9175 and 9176.
> 
> [ Fix ]
> 
> Backport the following patch from upstream:
> - df194f57de71 s390/cpumf: Update CPU Measurement facility extended counter set
> support
> 
> [ Test Plan ]
> 
> Boot a z17 instance and run the command:
> ls -l /sys/devices/cpum_cf/events | wc -l
> The output must be 160.
> 
> [ Where Problems Could Occur ]
> 
> The fix modifies CPUMF event registration for IBM z17. A bug in this patch may
> cause incorrect event exposure on unsupported hardware, leading to invalid perf
> measurements, sysfs inconsistencies, or kernel warnings due to misconfigured or
> non-existent counters.
> 
> 



Rejected for the following reasons:
HW enablement beyond latest LTS

-Stefan
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