linux-kernel - Re: [PATCH v8 24/32] x86/resctrl: Add energy/perf choices to rdt boot option

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Message-ID: <bb85b3e9-d10c-4b6a-a02e-e67a439b5a29@intel.com>
Date: Thu, 14 Aug 2025 14:51:57 -0700
From: Reinette Chatre <reinette.chatre@...el.com>
To: Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghuay@...dia.com>, "Maciej
 Wieczor-Retman" <maciej.wieczor-retman@...el.com>, Peter Newman
	<peternewman@...gle.com>, James Morse <james.morse@....com>, Babu Moger
	<babu.moger@....com>, Drew Fustini <dfustini@...libre.com>, Dave Martin
	<Dave.Martin@....com>, Chen Yu <yu.c.chen@...el.com>
CC: <x86@...nel.org>, <linux-kernel@...r.kernel.org>,
	<patches@...ts.linux.dev>
Subject: Re: [PATCH v8 24/32] x86/resctrl: Add energy/perf choices to rdt boot
 option

Hi Tony,

On 8/11/25 11:16 AM, 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. Just like the legacy
> features the command line enable overrides quirk disable.

I am not able to parse the last sentence.

> 
> Signed-off-by: Tony Luck <tony.luck@...el.com>
> ---

Reinette