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Re: dropping 32-bit host support

From: Philippe Mathieu-Daudé
Subject: Re: dropping 32-bit host support
Date: Thu, 16 Mar 2023 08:05:09 +0100
User-agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:102.0) Gecko/20100101 Thunderbird/102.8.0

Hi Andrew,

On 16/3/23 01:57, Andrew Randrianasulu wrote:
Looking at https://wiki.qemu.org/ChangeLog/8.0 <https://wiki.qemu.org/ChangeLog/8.0>

System emulation on 32-bit x86 and ARM hosts has been deprecated. The QEMU project no longer considers 32-bit x86 and ARM support for system emulation to be an effective use of its limited resources, and thus intends to discontinue.


well, I guess arguing from memory-consuption point on 32 bit x86 hosts (like my machine where I run 32 bit userspace on 64 bit kernel) is not

If you use a 64-bit kernel, then your host is 64-bit :)

host: hardware where you run QEMU
guest: what is run within QEMU

Running 32-bit *guest* on your 64-bit *host* is still supported.

We don't plan to support running 32-bit WinXP x86 (guest) on 32-bit
Raspberry Pi 2 (host) for example.

going anywhere, but what about 32bit userspace on Android tablets, either via Limbo emulator or qemu itself in Termux?

*System* emulation [on 32-bit hosts] is deprecated. User emulation
(such linux-user) is not. For example, you can still run 64-bit x86_64
Linux binaries on a 32-bit ARM Raspberry Pi.

At least I hope it will be not *actively* (intentionally) broken, just ...unsupported (so users who know how to run git revert still will get their build for some more time).

Unsupported code almost always unintentionally end bit-rotting...

I hope this is clearer.



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