linux-kernel - Re: [PATCH] x86/cpufeatures: Correct LKGS feature flag description

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Message-ID: <20251016124118.GAaPDn7nLmV2zNSlKo@fat_crate.local>
Date: Thu, 16 Oct 2025 14:41:18 +0200
From: Borislav Petkov <bp@...en8.de>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Xin Li <xin@...or.com>, Borislav Petkov <bp@...nel.org>,
	Xin Li <xin3.li@...el.com>, X86 ML <x86@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86/cpufeatures: Correct LKGS feature flag description

On Wed, Oct 15, 2025 at 08:12:08PM -0700, H. Peter Anvin wrote:
> No, "load user space GS." It loads everything, not just the base.

My aim is to have the comment be maximally helpful:

#define X86_FEATURE_LKGS                (12*32+18) /* Like MOV_GS except MSR_KERNEL_GS_BASE = GS.base */

This is the gist of what's in the FRED spec.

-- 
Regards/Gruss,
    Boris.

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