Re: [PATCH 1/2] vfio: Make vfio-pci available on 64-bit host platforms only

[Thomas Huth <thuth@redhat.com>]

On 03/03/2025 18.32, Philippe Mathieu-Daudé wrote:
> On 3/3/25 17:57, Peter Maydell wrote:
>> On Mon, 3 Mar 2025 at 15:49, Cédric Le Goater <clg@redhat.com> wrote:
>>> Why are we keeping qemu-system-ppc and qemu-system-i386, and arm,
>>> since qemu-system-ppc64 and qemu-system-x86_64 should be able to
>>> run the same machines ?
>>
>> They're not identical -- for example "-cpu max" on
>> qemu-system-arm is a 32-bit CPU but on qemu-system-aarch64
>> it is a 64-bit CPU.
>>
>> There's definitely a lot of overlap but we can't just drop
>> the -arm executable until/unless we figure out what to do
>> about the corner cases where they are different. Plus there's
>> a lot of users out there with existing command lines and
>> configs that assume the existence of a qemu-system-arm
>> executable.
> 
> Thomas and myself have been trying to sort that out. Now with the
> single-binary effort, it gained new interest. This hasn't be a trivial
> task so far, due to as you mentioned the legacy CLI uses and migration.

FWIW, here's my former attempt to see whether we could move into that direction:

  https://lore.kernel.org/qemu-devel/20230425133851.489283-1-thuth@redhat.com/

In the end, it was too frustrating to struggle with the 
backwards-compatibility questions (do we really need to keep 
qemu-system-i386 around forever?), so I pretty much gave up on that patch 
series.

  Thomas