linux-kernel - Re: [PATCH v13 14/14] x86/mm: add noinvlpgb commandline option

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Message-ID: <79d279294bd9dc6e8385495b1ec9abfcfe03856a.camel@surriel.com>
Date: Sun, 23 Feb 2025 19:34:03 -0500
From: Rik van Riel <riel@...riel.com>
To: Borislav Petkov <bp@...en8.de>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, peterz@...radead.org, 
	dave.hansen@...ux.intel.com, zhengqi.arch@...edance.com,
 nadav.amit@...il.com, 	thomas.lendacky@....com, kernel-team@...a.com,
 linux-mm@...ck.org, 	akpm@...ux-foundation.org, jackmanb@...gle.com,
 jannh@...gle.com, 	mhklinux@...look.com, andrew.cooper3@...rix.com,
 Manali.Shukla@....com, 	mingo@...nel.org
Subject: Re: [PATCH v13 14/14] x86/mm: add noinvlpgb commandline option

On Sun, 2025-02-23 at 22:29 +0100, Borislav Petkov wrote:
> On Sun, Feb 23, 2025 at 02:49:04PM -0500, Rik van Riel wrote:
> > Add a "noinvlpgb" commandline option to disable AMD
> > broadcast TLB flushing at boot time.
> 
> See if clearcpuid= works too pls.
> 
What specifically are the things you want me to test here?

Just that clearcpuid=419 properly disables INVLPGB, or
also whether clearcpuid=145 (PCID) also automatically
disables INVLPGB?

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