linux-kernel - Re: [PATCH 0/3] tso: aarch64: Expose TSO for virtualized linux on Apple Silicon

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Date: Thu, 11 Apr 2024 14:37:56 +0100
From: Will Deacon <will@...nel.org>
To: Zayd Qumsieh <zayd_qumsieh@...le.com>
Cc: Catalin Marinas <catalin.marinas@....com>,
	Mark Brown <broonie@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mateusz Guzik <mjguzik@...il.com>,
	Anshuman Khandual <anshuman.khandual@....com>,
	Marc Zyngier <maz@...nel.org>,
	Oliver Upton <oliver.upton@...ux.dev>,
	Miguel Luis <miguel.luis@...cle.com>,
	Joey Gouly <joey.gouly@....com>,
	Christoph Paasch <cpaasch@...le.com>,
	Kees Cook <keescook@...omium.org>,
	Sami Tolvanen <samitolvanen@...gle.com>,
	Baoquan He <bhe@...hat.com>,
	Lecopzer Chen <lecopzer.chen@...iatek.com>,
	Joel Granados <j.granados@...sung.com>,
	Dawei Li <dawei.li@...ngroup.cn>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Florent Revest <revest@...omium.org>,
	David Hildenbrand <david@...hat.com>,
	Stefan Roesch <shr@...kernel.io>, Andy Chiu <andy.chiu@...ive.com>,
	Josh Triplett <josh@...htriplett.org>,
	Oleg Nesterov <oleg@...hat.com>, Helge Deller <deller@....de>,
	Zev Weiss <zev@...ilderbeest.net>,
	Ondrej Mosnacek <omosnace@...hat.com>,
	Miguel Ojeda <ojeda@...nel.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] tso: aarch64: Expose TSO for virtualized linux on
 Apple Silicon

Hi Zayd,

It makes a nice change to see an apple.com address on the mailing list!

On Wed, Apr 10, 2024 at 02:16:38PM -0700, Zayd Qumsieh wrote:
> x86 CPUs use a TSO memory model. Apple Silicon CPUs have the ability to
> selectively use a TSO memory model. This can be done by setting the
> ACTLR.TSOEN bit to 1. This feature is useful for x86 emulators, since it
> removes the need for emulators to insert memory barriers in order to abide
> by the TSO memory model. This patch series will add ACTLR.TSOEN support to
> virtualized linux on Apple Silicon machines. Userspace will be able to use
> a prctl to change the memory model of the CPU from the default ARM64 memory
> model to a TSO memory model.

FWIW: I've replied on the other series from Hector:

https://lore.kernel.org/lkml/20240411132853.GA26481@willie-the-truck/T/#t

Will