ACK: [SRU][N/P][PATCH 0/1] [UBUNTU 24.04] Kernel: Add CPUMF extended counter set for z17 (LP: #2114258)

[Wei-Lin Chang]

On Sun, Jun 15, 2025 at 11:00:58AM +0200, Massimiliano Pellizzer wrote:
> BugLink: https://bugs.launchpad.net/bugs/2114258
> 
> [ 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 106.
> 
> [ 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.
> 
> 
> -- 
> kernel-team mailing list
> kernel-team at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kernel-team

Acked-by: Wei-Lin Chang <weilin.chang at canonical.com>