linux-kernel - Re: [PATCH v6 5/5] x86/gsseg: use the LKGS instruction if available for load_gs

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Message-ID: <20240701064002.GBZoJPQg2IXSCRa4sN@fat_crate.local>
Date: Mon, 1 Jul 2024 08:40:02 +0200
From: Borislav Petkov <bp@...en8.de>
To: "H. Peter Anvin" <hpa@...or.com>
Cc: Xin Li <xin3.li@...el.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, tglx@...utronix.de, mingo@...hat.com,
	dave.hansen@...ux.intel.com, peterz@...radead.org,
	brgerst@...il.com, chang.seok.bae@...el.com, jgross@...e.com
Subject: Re: [PATCH v6 5/5] x86/gsseg: use the LKGS instruction if available
 for load_gs_index()

On Sun, Jun 30, 2024 at 11:31:42PM -0700, H. Peter Anvin wrote:
> Yes, all loads into a segment register are truncated to 16 bits.

Right, but are we saying that somewhere explicitly or it is too obvious so
that there's no need to?

-- 
Regards/Gruss,
    Boris.

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