Re: [RFC] mpam,x86,fs/resctrl: Generic schema description Proof of Concept

["Chen, Yu C" <yu.c.chen@intel.com>]

Hi Reinette,

On 6/10/2026 11:59 PM, Reinette Chatre wrote:
> Hi Chenyu,
> 

[ ... ]

> 
> -  This implies that all current and future ERDT capable systems will keep
>     supporting MSR access with the legacy "percentage based control". Is this
>     accurate? What will behavior be on an ERDT system that does not support
>     MSR access with the percentage-based control?

Would it make sense to encourage users to switch to MMIO-based access if 
the
platform replaces MSR interfaces with MMIO-based ones? One issue with 
emulating
MSR-based access is that there may not be a strict 1:1 mapping between 
the MSR
range and the MMIO range. Additionally, I am unsure whether both are 
strictly
linearly scalable, so it could be challenging to create a proper mapping for
msr_value_emulated = map(mmio_value) IIUC.

thanks,
Chenyu