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

[Thomas Huth <thuth@redhat.com>]

On 27.06.2018 13:08, Alex Bennée wrote:
> 
> Thomas Huth <thuth@redhat.com> writes:
> 
>> On 27.06.2018 09:57, Markus Armbruster wrote:
>>> Thomas Huth <thuth@redhat.com> 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.
>>
>> Theoretically I'd agree, but actually it's more than that: If we drop
>> support for 32-bit hosts, we could also drop the qemu-system-i386,
>> qemu-system-ppc and qemu-system-arm targets, since qemu-system-x86_64,
>> qemu-system-ppc64 and qemu-system-aarch64 are a clear superset of
>> these.
> 
> Hmm not quite - not building on HOST != not wanting to run GUEST
> 
> While I'm unlikely to build on a 32 bit ARM system I run 32 bit guests
> all the time.

But you can also run 32-bit ARM guests with qemu-system-aarch64, can't you?

 Thomas