Re: [PATCH v5 0/3] x86,fs/resctrl,arm_mpam: Factor MBA parse-time conversion to be per-arch

[Reinette Chatre]

Dear x86 maintainers,

Could you please consider this series for inclusion? It applies cleanly on top
of x86/cache with HEAD at
	 2566b5cd6a27 ("fs/resctrl: Fix UAF from worker threads when domains are removed")

Please note that this is the first instance of a series that touches resctrl fs, x86, and
Arm. Since this is a resctrl fs API change these patches should stay together. You will
find in Ben's message below that patch routing via tip is supported by Arm.

Thank you very much

Reinette

On 7/9/26 2:31 AM, Ben Horgan wrote:
> This version fixes a couple of non-functional mistakes in v4 pointed out by Reinette.
> 
> The patches should stay together so please could this all go via tip.
> 
> Changelogs in patches.
> 
> From cover letter of v3:
> 
> This is a new version of Dave Martin's patch [1] to delegate rounding of
> bandwidth control user values to the arch code. As there is now more than one
> architecture using resctrl, I split the original patch into two, a core resctrl
> patch and an x86 patch, and added an MPAM patch. Please let me know if the patch
> break down and ordering is sensible and whether the pattern should be followed
> for any future similar changes.
> 
> This does have a user visible effect on MB schema when using MPAM hardware
> with 'bandwidth_gran' greater than 1. I'm not sure if MPAM hardware with such
> coarse controls exists in the wild but it is spec compliant and I've tested it
> on a model.
> 
> [1] https://lore.kernel.org/lkml/20251031154225.14799-1-Dave.Martin@xxxxxxx/
> 
> v3: https://lore.kernel.org/lkml/20260515140612.1205251-1-ben.horgan@xxxxxxx/
> v4: https://lore.kernel.org/lkml/20260706160639.2136674-1-ben.horgan@xxxxxxx/
> 
> Based on v7.2-rc2
> 
> Ben Horgan (1):
>   arm_mpam: resctrl: Add pass-through resctrl_arch_preconvert_bw()
> 
> Dave Martin (2):
>   x86,fs/resctrl: Add resctrl_arch_preconvert_bw()
>   fs/resctrl: Factor MBA parse-time conversion to be per-arch
> 
>  Documentation/filesystems/resctrl.rst     | 17 +++++++++--------
>  arch/x86/kernel/cpu/resctrl/ctrlmondata.c |  6 ++++++
>  drivers/resctrl/mpam_resctrl.c            |  5 +++++
>  fs/resctrl/ctrlmondata.c                  |  6 +++---
>  include/linux/resctrl.h                   | 19 +++++++++++++++++++
>  5 files changed, 42 insertions(+), 11 deletions(-)
>