Re: [PATCH v6 00/40] arm_mpam: Add KVM/arm64 and resctrl glue code

From: Fenghua Yu

Date: Wed Apr 01 2026 - 19:56:25 EST




On 3/13/26 07:45, Ben Horgan wrote:
This version of the mpam missing pieces series sees a couple of things
dropped or hidden. Memory bandwith utilization with free-running counters
is dropped in preference of just always using 'mbm_event' mode (ABMC
emulation) which simplifies the code and allows for, in the future,
filtering by read/write traffic. So, for the interim, there is no memory
bandwidth utilization support. CDP is hidden behind config expert as
remount of resctrl fs could potentially lead to out of range PARTIDs being
used and the fix requires a change in fs/resctrl. The setting of MPAM2_EL2
(for pkvm/nvhe) is dropped as too expensive a write for not much value.

There are a couple of 'fixes' at the start of the series which address
problems in the base driver but are only user visible due to this series.

Tested-by: Fenghua Yu <fenghuay@xxxxxxxxxx>

Thanks.

-Fenghua