From: Mark Brown <broonie@kernel.org>
To: Steven Price <steven.price@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Gavin Shan <gshan@redhat.com>,
Catalin Marinas <catalin.marinas@arm.com>,
linux-kernel@vger.kernel.org, Julien Grall <julien.grall@arm.com>,
Amit Daniel Kachhap <amit.kachhap@arm.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>, Qais Yousef <qais.yousef@arm.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
Marc Zyngier <maz@kernel.org>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Andrey Ignatov <rdna@fb.com>,
Sami Tolvanen <samitolvanen@google.com>,
David Brazdil <dbrazdil@google.com>,
Dave Martin <Dave.Martin@arm.com>,
Kees Cook <keescook@chromium.org>,
sonicadvance1@gmail.com,
Frederic Weisbecker <frederic@kernel.org>,
Kristina Martsenko <kristina.martsenko@arm.com>,
Al Viro <viro@zeniv.linux.org.uk>,
amanieu@gmail.com, Peter Collingbourne <pcc@google.com>,
linux-arm-kernel@lists.infradead.org,
Jens Axboe <axboe@kernel.dk>, Kevin Hao <haokexin@gmail.com>,
Jason Yan <yanaijie@huawei.com>, Oleg Nesterov <oleg@redhat.com>,
Tian Tao <tiantao6@hisilicon.com>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@kernel.org>
Subject: Re: [RESEND RFC PATCH v2] arm64: Exposes support for 32-bit syscalls
Date: Fri, 12 Feb 2021 12:35:15 +0000 [thread overview]
Message-ID: <20210212123515.GC6057@sirena.org.uk> (raw)
In-Reply-To: <58b03e17-3729-99ea-8691-0d735a53b9bc@arm.com>
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On Fri, Feb 12, 2021 at 11:30:41AM +0000, Steven Price wrote:
> On 11/02/2021 20:21, sonicadvance1@gmail.com wrote:
> > Why do we need compatibility layers?
> > There are ARMv8 CPUs that only support AArch64 but still need to run
> > AArch32 applications.
> > Cortex-A34/R82 and other cores are prime examples of this.
> > Additionally if a user is needing to run legacy 32-bit x86 software, it
> > needs the same compatibility layer.
> Unless I'm much mistaken QEMU's user mode already does this - admittedly I
> don't tend to run "legacy 32-bit x86 software".
Yes, this has been deployed on Debian for a long time - you can install
any combination of Debian architectures on a single system and it will
use qemu to run binaries that can't be supported natively by the
hardware.
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next prev parent reply other threads:[~2021-02-12 12:37 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 20:21 [RESEND RFC PATCH v2] arm64: Exposes support for 32-bit syscalls sonicadvance1
2021-02-12 11:30 ` Steven Price
2021-02-12 12:35 ` Mark Brown [this message]
2021-02-12 13:28 ` Catalin Marinas
2021-02-12 14:12 ` David Laight
2021-02-12 14:44 ` Catalin Marinas
2021-02-12 15:06 ` David Laight
2021-02-12 16:24 ` Amanieu d'Antras
2021-02-12 18:04 ` Mark Rutland
2021-02-12 19:06 ` Amanieu d'Antras
2021-02-12 13:59 ` Arnd Bergmann
2021-02-12 14:13 ` Mark Rutland
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