linux-kernel - Re: [RESEND RFC PATCH v2] arm64: Exposes support for 32-bit syscalls

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Date:   Fri, 12 Feb 2021 12:35:15 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Steven Price <steven.price@....com>
Cc:     sonicadvance1@...il.com, amanieu@...il.com,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Dave Martin <Dave.Martin@....com>,
        Amit Daniel Kachhap <amit.kachhap@....com>,
        Marc Zyngier <maz@...nel.org>,
        David Brazdil <dbrazdil@...gle.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Gavin Shan <gshan@...hat.com>, Mike Rapoport <rppt@...nel.org>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Kristina Martsenko <kristina.martsenko@....com>,
        Kees Cook <keescook@...omium.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Kevin Hao <haokexin@...il.com>,
        Jason Yan <yanaijie@...wei.com>, Andrey Ignatov <rdna@...com>,
        Peter Collingbourne <pcc@...gle.com>,
        Julien Grall <julien.grall@....com>,
        Tian Tao <tiantao6@...ilicon.com>,
        Qais Yousef <qais.yousef@....com>,
        Jens Axboe <axboe@...nel.dk>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND RFC PATCH v2] arm64: Exposes support for 32-bit syscalls

On Fri, Feb 12, 2021 at 11:30:41AM +0000, Steven Price wrote:
> On 11/02/2021 20:21, sonicadvance1@...il.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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