Received-SPF: pass (google.com: domain of linux-kernel+bounces-140524-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:45d1:ec00::1 as permitted sender) client-ip=2604:1380:45d1:ec00::1;
Date: Thu, 11 Apr 2024 14:37:56 +0100
From: Will Deacon <will@kernel.org>
To: Zayd Qumsieh <zayd_qumsieh@apple.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Mark Brown <broonie@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Mateusz Guzik <mjguzik@gmail.com>,
	Anshuman Khandual <anshuman.khandual@arm.com>,
	Marc Zyngier <maz@kernel.org>,
	Oliver Upton <oliver.upton@linux.dev>,
	Miguel Luis <miguel.luis@oracle.com>,
	Joey Gouly <joey.gouly@arm.com>,
	Christoph Paasch <cpaasch@apple.com>,
	Kees Cook <keescook@chromium.org>,
	Sami Tolvanen <samitolvanen@google.com>,
	Baoquan He <bhe@redhat.com>,
	Lecopzer Chen <lecopzer.chen@mediatek.com>,
	Joel Granados <j.granados@samsung.com>,
	Dawei Li <dawei.li@shingroup.cn>,
	Andrew Morton <akpm@linux-foundation.org>,
	Florent Revest <revest@chromium.org>,
	David Hildenbrand <david@redhat.com>,
	Stefan Roesch <shr@devkernel.io>, Andy Chiu <andy.chiu@sifive.com>,
	Josh Triplett <josh@joshtriplett.org>,
	Oleg Nesterov <oleg@redhat.com>, Helge Deller <deller@gmx.de>,
	Zev Weiss <zev@bewilderbeest.net>,
	Ondrej Mosnacek <omosnace@redhat.com>,
	Miguel Ojeda <ojeda@kernel.org>,
	linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/3] tso: aarch64: Expose TSO for virtualized linux on
 Apple Silicon
Message-ID: <20240411133755.GA26535@willie-the-truck>
References: <20240410211652.16640-1-zayd_qumsieh@apple.com>
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20240410211652.16640-1-zayd_qumsieh@apple.com>
User-Agent: Mutt/1.10.1 (2018-07-13)

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