linux-kernel - Re: [RFC v2 4/9] x86/mm: Introduce X86_FEATURE

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Message-ID: <cb657cabbc3c87e0a821c7c3fcc16e62b7d854f4.camel@surriel.com>
Date: Wed, 21 May 2025 09:57:52 -0400
From: Rik van Riel <riel@...riel.com>
To: Borislav Petkov <bp@...en8.de>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org, 
	kernel-team@...a.com, dave.hansen@...ux.intel.com, luto@...nel.org, 
	peterz@...radead.org, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, 
	nadav.amit@...il.com, Rik van Riel <riel@...com>, Yu-cheng Yu
	 <yu-cheng.yu@...el.com>
Subject: Re: [RFC v2 4/9] x86/mm: Introduce X86_FEATURE_RAR

On Wed, 2025-05-21 at 13:53 +0200, Borislav Petkov wrote:
> On Mon, May 19, 2025 at 09:02:29PM -0400, Rik van Riel wrote:
> > From: Rik van Riel <riel@...com>
> > 
> > Introduce X86_FEATURE_RAR and enumeration of the feature.
> > 
> > [riel: moved initialization to intel.c and disabling to
> > Kconfig.cpufeatures]
> > 
> > Signed-off-by: Yu-cheng Yu <yu-cheng.yu@...el.com>
> 
> I'm guessing Yu-cheng is the original author - that's expressed
> differently.

I will fix that up!

> 
> > @@ -1771,6 +1783,7 @@ static void __init early_identify_cpu(struct
> > cpuinfo_x86 *c)
> >  		setup_clear_cpu_cap(X86_FEATURE_LA57);
> >  
> >  	detect_nopl();
> > +	detect_rar(c);
> >  }
> 
> Move all this gunk into early_init_intel().
> 
I had the same thought, and tried that already.

It didn't work.

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