Re: [Qemu-ppc] KVM and variable-endianness guest CPUs

Benjamin Herrenschmidt
2014-01-28T00:33:07Z

On Thu, 2014-01-23 at 20:11 -0800, Victor Kamensky wrote:
> > I would take 50 byteswaps with a clear ABI any day over an obscure
> > standard that can avoid a single hardware-on-register instruction.
> This
> > is about designing a clean software interface, not about building an
> > optimized integrated stack.
> >
> > Unfortunately, this is going nowhere, so I think we need to stop
> this
> > thread. As you can see I have sent a patch as a clarification to
> the
> > ABI, if it's merged we can move on with more important tasks.
>
> OK, that is fine. I still believe is not the best choice,
> but I agree that we need to move on. I will respin my
> V7 KVM BE patches according to this new semantics, I will
> integrate comments that you (thanks!) and others gave me
> over mailing list and post my series again when it is ready.

Right, the whole "host endian" is a horrible choice from every way you
look at it, but I'm afraid it's unfixable since it's already ABI :-(

Ben.