Re: [RFC PATCH 1/1] virtio: write back features before verify

[Cornelia Huck]

On Mon, Oct 04 2021, Halil Pasic <pasic@xxxxxxxxxxxxx> wrote:

> On Mon, 04 Oct 2021 09:01:42 +0200
> Cornelia Huck <cohuck@xxxxxxxxxx> wrote:
>
>> On Sat, Oct 02 2021, "Michael S. Tsirkin" <mst@xxxxxxxxxx> wrote:
>> 
>> > On Fri, Oct 01, 2021 at 05:18:46PM +0200, Cornelia Huck wrote:  
>> >> I'd say we need a hack here so that we assume little-endian config space
>> >> if VERSION_1 has been offered; if your patch here works, I assume QEMU
>> >> does what we expect (assmuming little-endian as well.) I'm mostly
>> >> wondering what happens if you use a different VMM; can we expect it to
>> >> work similar to QEMU?  
>> >
>> > Hard to say of course ... hopefully other VMMs are actually
>> > implementing the spec. E.g. IIUC rust vmm is modern only.  
>> 
>> Yes, I kind of hope they are simply doing LE config space accesses.
>> 
>> Are there any other VMMs that are actually supported on s390x (or other
>> BE architectures)?
>> 
>
> I think zCX (z/OS Container Extensions) is relevant as it uses virtio.
> That is all I know about.

Ok, I'll assume that you (IBM) will be able to verify that any fixup
will continue to work there.