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

[Moger, Babu]

Ran few tests on the series. Everything looks good.

Tested-by: Babu Moger <babu.moger at amd.com>


On 7/14/2026 12:45 PM, Reinette Chatre wrote:
> 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@arm.com/
>>
>> v3: https://lore.kernel.org/lkml/20260515140612.1205251-1-ben.horgan@arm.com/
>> v4: https://lore.kernel.org/lkml/20260706160639.2136674-1-ben.horgan@arm.com/
>>
>> 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(-)
>>
> 
>