Re: [PATCH v3 0/3] selftests/resctrl: Fix resctrl selftests issues on aarch64

[Richard Cheng <icheng@nvidia.com>]

On Fri, May 29, 2026 at 10:23:48AM +0800, Richard Cheng wrote:
> This series fixes numerous issues in the resctrl selftests on aarch64,
> where they currently misreport failures.
> 
> Patch 1 skips L3_CAT at feature-check time when MPAM legitimately
> reports every CBM bit as shareable, instead of failing the test.
> 
> Patch 2 adds aarch64 implementations of cl_flush() and sb() in
> fill_buf.c so cache flushes are no longer silent no-ops.
> 
> Patch 3 teaches detect_vendor() about aarch64 (which exposes no
> vendor_id in /proc/cpuinfo) and lets arch_supports_noncont_cat()
> return true for ARM, fixing spurious L3_NONCONT_CAT failures.
> 
> Changes since v2:
>     - Patch 1: add Ilpo's Reviewed-by.
>     - Patch 3: factor the aarch64 check into a detect_aarch64() helper
>       instead of an inline #ifdef in detect_vendor().
>     - Fix the patch ordering in this cover letter to match the series.
> 
> Richard Cheng (3):
>   selftests/resctrl: Skip L3_CAT when no exclusive cache portion exists
>   selftests/resctrl: Implement cl_flush() and sb() for aarch64
>   selftests/resctrl: Recognise aarch64 as a vendor for L3_NONCONT_CAT
> 
>  tools/testing/selftests/resctrl/cat_test.c    | 32 +++++++++++++++++--
>  tools/testing/selftests/resctrl/fill_buf.c    |  6 ++++
>  tools/testing/selftests/resctrl/resctrl.h     |  1 +
>  .../testing/selftests/resctrl/resctrl_tests.c | 21 ++++++++++++
>  4 files changed, 57 insertions(+), 3 deletions(-)
> 
> -- 
> 2.43.0
>

Sorry forgot to cc Ilpo.

+Cc. Ilpo Järvinen

Best regards,
Richard Cheng.