ACK: [SRU][F][I][J][PATCH 0/2] kernel: Add support for CPU-MF counter second version 7

[Tim Gardner]

Acked-by: Tim Gardner <tim.gardner at canonical.com>

On 2/16/22 4:43 AM, Krzysztof Kozlowski wrote:
> BugLink: https://bugs.launchpad.net/bugs/1960182
> 
> SRU Justification:
> 
> [Impact]
> 
> * Daemon cpacfstatsd fails on start up of the system
>    with this error message cpacfstatsd: Event DEA_FUNCTIONS for pmu
>    cpum_cf not found (2:No such file or directory)
> 
> * When the CPU Measurement facility device driver is initialized during
>    kernel boot, it reads out the CPU Measurement facility counter
>    hardware first and second version numbers. Depending on these numbers
>    the device driver exports attributes in the sysfs directory
>    /sys/devices/cpum_cf/events. When the CPM-MF second version number is
>    not known, no attributes of the crypto counter set are exported.
> 
>    However the cpacfstatsd program scans the sysfs directory
>    /sys/devices/cpum_cf/events for attribute files of the crypto counter
>    set, for example attribute file DEA_FUNCTIONS and others.
> 
> [Fix]
> 
> * Add support for the new CPU-MF Measurement counter
>                 facility second version number 7
> 
> * Two patches (backport+cherry) for Focal.
> * Two patches (clean cherry) for Impish and Jammy.
> 
> [Test Plan]
> 
> * Tests provided by IBM. See also bug report.
> 
> [Where problems could occur]
> 
> * s390x only.
> 
> Thomas Richter (2):
>    s390/cpumf: Support for CPU Measurement Facility CSVN 7
>    s390/cpumf: Support for CPU Measurement Sampling Facility LS bit
> 
>   arch/s390/include/asm/cpu_mf.h         | 4 +++-
>   arch/s390/kernel/perf_cpum_cf_diag.c   | 4 ++--
>   arch/s390/kernel/perf_cpum_cf_events.c | 6 +++---
>   arch/s390/kernel/perf_cpum_sf.c        | 2 +-
>   4 files changed, 9 insertions(+), 7 deletions(-)
> 

-- 
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Tim Gardner
Canonical, Inc