linux-kernel - Re: [PATCH] x86,cpu: add X86_FEATURE

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Message-ID: <05edf115007ae9d6169b55d437dff99abcad0939.camel@surriel.com>
Date: Wed, 25 Sep 2024 10:05:39 -0400
From: Rik van Riel <riel@...riel.com>
To: Xin Li <xin@...or.com>, Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave
 Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, "H. Peter Anvin"
 <hpa@...or.com>,  linux-kernel@...r.kernel.org, kernel-team@...a.com
Subject: Re: [PATCH] x86,cpu: add X86_FEATURE_INVLPGB flag

On Tue, 2024-09-24 at 20:33 -0700, Xin Li wrote:
> On 9/24/2024 3:00 PM, Rik van Riel wrote:
> > Add the definition for the X86_FEATURE_INVLPGB CPUID flag.
> > 
> > Tested by booting a kernel with this change on an AMD Milan system,
> > and making sure the "invlpgb" flag shows up in /proc/cpuinfo
> > 
> > Signed-off-by: Rik van Riel <riel@...riel.com>
> 
> Now there is a need to also update the CPUID database:
> 
> https://lore.kernel.org/lkml/87o7642u7w.ffs@tglx/

The invlpgb flag is already in the CPUID database:

https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/tip/db/xml/leaf_80000008.xml#L53

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