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Re: [Qemu-devel] Drop support for 32bit hosts in qemu?

From: Juan Quintela
Subject: Re: [Qemu-devel] Drop support for 32bit hosts in qemu?
Date: Wed, 27 Jun 2018 15:02:48 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux)

Markus Armbruster <address@hidden> wrote:
> Thomas Huth <address@hidden> writes:
>> On 27.06.2018 08:51, Gerd Hoffmann wrote:
> [...]
>>> Drop support for 32bit hosts in qemu?
>> I guess the only way to answer that question reliably is to send a patch
>> to mark 32-bit hosts as deprecated...
>> Anyway, you still have got to fix that problem with -m32 now somehow
>> since we certainly can not drop 32-bit immediately.
> We certainly can if we want to.
> Our formal deprecation policy codifies our compromise between the need
> to evolve QEMU and the need of its users for stable external interfaces.
> "Compiles on host X" is also a need, but it's a different one.
> Evidence: "Supported build platforms" has its own appendix, separate
> from "Deprecated features".  It's mum on 32-bit hosts.
> I'm not saying we *should* drop 32-bit hosts immediately.  Only that the
> feature deprecation policy does not apply.
> Is QEMU still useful on 32-bit hosts?  Honest question!

At least require 32bits architectures/compilers able to use 64bit
atomics.  That leaves us with x86 (depending on compiler).  And there
haven't been 32bit x86 hosts since .....

Later, Juan.

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