Re: [PATCH v12 23/31] x86/resctrl: Add energy/perf choices to rdt boot option

[Reinette Chatre]

Hi Tony,

On 10/13/25 3:33 PM, Tony Luck wrote:
> Legacy resctrl features are enumerated by X86_FEATURE_* flags. These
> may be overridden by quirks to disable features in the case of errata.
> Users can use kernel command line options to either disable a feature,
> or to force enable a feature that was disabled by a quirk.
> 
> Provide similar functionality for hardware features that do not have an
> X86_FEATURE_* flag.  Unlike other features that are tied to X86_FEATURE_*
> flags, these must be queried by name. Add rdt_is_feature_enabled()
> to check whether quirks or kernel command line have disabled a feature.
> 
> Users may force a feature to be disabled. E.g. "rdt=!perf" will ensure
> that none of the perf telemetry events are enabled.
> 
> Resctrl architecture code may disable a feature that does not provide
> full functionality. Users may override that decision.  E.g. "rdt=energy"
> will enable any available energy telemetry events even if they do not
> provide full functionality.
> 
> Signed-off-by: Tony Luck <tony.luck@xxxxxxxxx>
> ---

Reviewed-by: Reinette Chatre <reinette.chatre@xxxxxxxxx>

Reinette