linux-kernel - Re: [PATCH 02/10] x86,tlb: get INVLPGB count max from CPUID

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Message-ID: <9beef4411b811c08106332b92d2f2776735af7c3.camel@surriel.com>
Date: Sun, 22 Dec 2024 09:39:42 -0500
From: Rik van Riel <riel@...riel.com>
To: Borislav Petkov <bp@...en8.de>, x86@...nel.org
Cc: linux-kernel@...r.kernel.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,
 akpm@...ux-foundation.org
Subject: Re: [PATCH 02/10] x86,tlb: get INVLPGB count max from CPUID

On Sun, 2024-12-22 at 12:46 +0100, Borislav Petkov wrote:
> On December 22, 2024 5:06:34 AM GMT+01:00, Rik van Riel
> <riel@...riel.com> wrote:
> > The CPU advertises the maximum number of pages that can be shot
> > down
> > with one INVLPGB instruction in the CPUID data.
> > 
> > Save that information for later use.
> 
> Definitely not replicate a single datum into every CPU's descriptor.
> 
Oops. I was under the impression this was only done for
the boot CPU.

I'll turn it into a global variable.

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