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

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Subject: RE: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
From: David Laight <David.Laight@xxxxxxxxxx>
Date: Thu, 6 May 2021 09:47:46 +0000
Accept-language: en-GB, en-US
Cc: Stefan Metzmacher <metze@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, "Peter Zijlstra" <peterz@xxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "Jens Axboe" <axboe@xxxxxxxxx>, Linux Kernel Mailing List <linux-kernel@xxxxxxxxxxxxxxx>, io-uring <io-uring@xxxxxxxxxxxxxxx>, "the arch/x86 maintainers" <x86@xxxxxxxxxx>, "linux-toolchains@xxxxxxxxxxxxxxx" <linux-toolchains@xxxxxxxxxxxxxxx>
In-reply-to: <CALCETrUF5M+Qw+RfY8subR7nzmpMyFsE3NHSAPoMVWMz6_hr-w@mail.gmail.com>
Thread-index: AQHXQfuSElK5zn4+eUeudkt5GoEV9qrWNZZw
Thread-topic: [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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Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)

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References:
- Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
  - From: Andy Lutomirski
- Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
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- Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
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- Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
  - From: Simon Marchi
- Re: [PATCH] io_thread/x86: don't reset 'cs', 'ss', 'ds' and 'es' registers for io_threads
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