linux-kernel - RE: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io

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Date:   Thu, 6 May 2021 09:47:46 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Andy Lutomirski' <luto@...nel.org>,
        Simon Marchi <simon.marchi@...ymtl.ca>
CC:     Stefan Metzmacher <metze@...ba.org>,
        Borislav Petkov <bp@...en8.de>,
        "Peter Zijlstra" <peterz@...radead.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Jens Axboe" <axboe@...nel.dk>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        io-uring <io-uring@...r.kernel.org>,
        "the arch/x86 maintainers" <x86@...nel.org>,
        "linux-toolchains@...r.kernel.org" <linux-toolchains@...r.kernel.org>
Subject: RE: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es'
 registers for io_threads

> (To avoid confusion, this is not a universal property of Linux.  arm64
> and arm32 tasks on an arm64 Linux host are different and cannot
> arbitrarily switch modes.)

Although there are patches lurking to change that.
(not from me).

	David

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