linux-kernel - Re: [PATCH 04/12] x86/mm: get INVLPGB count max from CPUID

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Message-ID: <20250110203420.GGZ4GETAo2HPUKaPgH@fat_crate.local>
Date: Fri, 10 Jan 2025 21:34:20 +0100
From: Borislav Petkov <bp@...en8.de>
To: Rik van Riel <riel@...riel.com>
Cc: Tom Lendacky <thomas.lendacky@....com>, x86@...nel.org,
	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, nadav.amit@...il.com,
	zhengqi.arch@...edance.com, linux-mm@...ck.org
Subject: Re: [PATCH 04/12] x86/mm: get INVLPGB count max from CPUID

On Fri, Jan 10, 2025 at 03:27:37PM -0500, Rik van Riel wrote:
> I don't see X86_FEATURE_TLBI defined in the tip
> tree. Which CPUID bit does that need to be?

It should be added as:

#define X86_FEATURE_INVLPGB          (13*32+ 3) /* INVLPGB and TLBSYNC instruction supported. */

in arch/x86/include/asm/cpufeatures.h

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette