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From: Thomas Huth <thuth@redhat.com>
To: Richard Henderson <richard.henderson@linaro.org>, qemu-devel@nongnu.org
Cc: peter.maydell@linaro.org, stefanha@redhat.com,
	pbonzini@redhat.com, berrange@redhat.com, philmd@linaro.org,
	mark.cave-ayland@ilande.co.uk, alex.bennee@linaro.org,
	Liviu Ionescu <ilg@livius.net>
Subject: Re: [PATCH 0/1] meson: Deprecate 32-bit host systems
Date: Tue, 28 Jan 2025 05:00:35 +0100	[thread overview]
Message-ID: <9a280789-9248-4eca-b50c-048fc58e3f53@redhat.com> (raw)
In-Reply-To: <20250128004254.33442-1-richard.henderson@linaro.org>

On 28/01/2025 01.42, Richard Henderson wrote:
> Time for our biennial attempt to kill ancient hosts.
> 
> I've been re-working the tcg code generator a bit over the holidays.
> One place that screams for a bit of cleanup is with 64-bit guest
> addresses on 32-bit hosts.  Of course the best "cleanup" is to not
> have to handle such silliness at all.
> 
> Two years after Thomas' last attempt,
> 
>    https://lore.kernel.org/qemu-devel/20230130114428.1297295-1-thuth@redhat.com/
> 
> which resulted only in deprecation of i686 host for system emulation.
> By itself, this just isn't enough for large-scale cleanups.
> 
> I'll note that we've separately deprecated mips32, set to expire
> with the end of Debian bookworm, set to enter LTS in June 2026.
> 
> I'll note that there is *already* no Debian support for ppc32,
> and that I am currently unable to cross-compile that host at all.

IIRC the biggest pushback that I got two years ago was with regards to 
32-bit arm: The recommended version of Raspberry Pi OS is still 32-bit:

  https://lore.kernel.org/qemu-devel/F852C238-77B8-4E24-9494-8D060EB78F9F@livius.net/

And looking at https://www.raspberrypi.com/software/operating-systems/ this 
still seems to be the case...

So I guess the main question is now: Would it be ok to kill support for 
32-bit Raspberry Pi OS nowadays?

> Showing my hand a bit, I am willing to limit deprecation to
> 64-bit guests on 32-bit hosts.  But I'd prefer to go the whole hog:
> unconditional support for TCG_TYPE_I64 would remove a *lot* of
> 32-bit fallback code.

Sound like a good alternative to me!

  Thomas



  parent reply	other threads:[~2025-01-28  4:01 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-01-28  0:42 [PATCH 0/1] meson: Deprecate 32-bit host systems Richard Henderson
2025-01-28  0:42 ` [PATCH 1/1] meson: Deprecate 32-bit host support Richard Henderson
2025-01-28  4:00 ` Thomas Huth [this message]
2025-01-28  9:02   ` [PATCH 0/1] meson: Deprecate 32-bit host systems Alex Bennée
2025-01-28  9:16     ` Daniel P. Berrangé
2025-01-28  9:17     ` Philippe Mathieu-Daudé
2025-01-28  9:27       ` Daniel P. Berrangé
2025-01-28 10:01         ` Philippe Mathieu-Daudé
2025-01-28 10:02           ` Philippe Mathieu-Daudé
2025-01-29  6:23             ` Thomas Huth
2025-01-29 12:23               ` Peter Maydell
2025-01-29 12:47                 ` Paolo Bonzini
2025-01-31 16:46                   ` Richard Henderson
2025-01-31 17:08                     ` Paolo Bonzini
2025-01-31 21:28                       ` Daniel P. Berrangé
2025-02-03  9:10                 ` Alex Bennée
2025-02-03 16:06                   ` Philippe Mathieu-Daudé
2025-01-28 20:39         ` Richard Henderson
2025-02-01 15:20     ` James Cloos

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