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Re: [RFC PATCH] docs/about/deprecated: Deprecate 32-bit host systems


From: Richard Henderson
Subject: Re: [RFC PATCH] docs/about/deprecated: Deprecate 32-bit host systems
Date: Mon, 30 Jan 2023 13:33:36 -1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.4.2

On 1/30/23 13:14, Philippe Mathieu-Daudé wrote:
On 30/1/23 20:19, Richard Henderson wrote:

But I do question whether we need to support 64-bit guests on 32-bit hosts at 
all.
Retaining 32-bit on 32-bit allows arm32 to emulate i686, which I suspect, but have no proof, is the limit of what users actually want.

I presume you implicitly restrict that to user emulation, right?

No, there's no specific reason to eliminate e.g. qemu-system-i386. or any other 32-bit guest. Though quite often such hardware doesn't really have enough ram to do a good job, that's not a technical argument against.


WRT i686, if your example is "i686 useremu on non-x86 embedde router"
then any 32-bit host is potentially interested, not only arm32.

arm32 was merely an example -- the other 32-bit hosts are i686, mips, ppc. But we don't have many of them.

I remember being able to run armhf binaries on armel hosts (and vice
versa) was useful 7 years ago.

Fair enough.

Today I have no clue, we could poll the community and some distributions.

Sure.


r~



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