Re: [PATCH v2 0/6] Deprecate support for 32-bit x86 and arm hosts

[Thomas Huth]

On 03/03/2023 12.09, John Paul Adrian Glaubitz wrote:
> Hello!
>
> On Fri, 2023-03-03 at 10:48 +0100, Thomas Huth wrote:
> > x86 ==> deprecate both, user and system emulation support on
> >           32-bit hosts
> > arm ==> deprecate only system emulation on 32-bit hosts.
>
> I would recommend against dropping support for 32-bit hosts for qemu-user
> as there are some cases where the emulation of 32-bit user code on 64-bit
> hosts does not work properly [1].
>
> Adrian
>
> > [1] https://sourceware.org/bugzilla/show_bug.cgi?id=23960

The ticket is very long and hard to read, but ... oh my, does that mean you 
need to compile qemu-user in 32-bit mode on a 64-bit x86 host to properly 
run 32-bit binaries from other architectures? ... uh, that's ugly ... and 
sounds like bug in QEMU's user mode emulation ... and what if you're running 
a distro (or different 64-bit host architecutre) that does not support 
32-bit userspace libraries anymore? Then you're lost?

 Thomas