Re: [PATCH v2 1/3] x86/resctrl: Fix ABMC counter programming for extended counter ranges

[Reinette Chatre]

Hi Babu,

On 9/14/26 5:18 PM, Moger, Babu wrote:
> 
> The original issue arose when programming a Counter ID wider than 5 bits. To address that issue, the Counter ID width needs to be increased to 12 bits.
> 
> Currently, the RMID width is 12 bits, and there is no hardware that supports a width greater than 12 bits.
> 
> How about we address the Counter ID issue for now and revisit the RMID width when the specification changes?
> 
> Would that work?

Neither change seems to be reflected in any public spec. The comment in this patch
seems to be that the upcoming spec change will cover both?

	The AMD64 Architecture Programmer's Manual [1] available at [2] will be
	updated accordingly in a future revision to document the expanded cntr_id
	and bw_src field definitions.

If you thus plan to change RMID width when the specification changes then it is not clear
to me how the timing is different from the counter ID width change.

In the end it is up to you though since the impact is on AMD hardware that you
are best to judge.

Reinette