ACK: [SRU][N][PATCH 0/1] [UBUNTU 24.04] PAI/NNPA support for new IBM z17 (LP: #2121956)

[Tim Whisonant]

On Thu, Sep 04, 2025 at 04:35:23PM +0200, Massimiliano Pellizzer wrote:
> BugLink: https://bugs.launchpad.net/bugs/2121956
> 
> [ Impact ]
> 
> Extend the s390 PAI monitoring infrastructure to cover new hardware capabilities
> in IBM Z systems.
> Add sysfs and perf event names for counters introduced with Message Security
> Assist (MSA) 10 and 11, enabling monitoring of new AES-XTS and HMAC-SHA
> variants, as well as protected key operations.
> Updates the NNPA counter set, adding events for modern AI/ML primitives.
> 
> [ Fix ]
> 
> Backport the following commits from upstream:
> - d414f4ecb240b s390/pai: export number of sysfs attribute files
> - 4ae48555d0edc s390/pai_crypto: Add support for MSA 10 and 11 pai counters
> - 0114009953c11 s390/pai_ext: Update PAI extension 1 counters
> 
> [ Test Plan ]
> 
> Run an ubuntu instance on IBM Z hardware that actually supports
> MSA 10/11 and the updated NNPA instructions.
> Check under /sys/bus/event_source/devices/pai_crypto/events/
> and /sys/bus/event_source/devices/pai_ext/events/
> to confirm that the new counters are exported.
> 
> [ Regression Potential ]
> 
> The regression potential of these patches is very low,
> since they only extend the PAI crypto and extension event description tables
> with new counters for newer IBM Z hardware generations.
> Any possible issues would be limited to inaccurate labeling
> or unsupported counters being exposed on systems with recent MSA or NNPA
> facilities,
> with no effect on older IBM Z machines or other architectures.
> 
> 
>

Acked-by: Tim Whisonant <tim.whisonant at canonical.com>