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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Wed, 18 Jun 2014 09:16:45 +1000
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Subject: Re: [Qemu-devel] [RFC] qemu VGA endian swap low level drawing
 changes
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To: Alexander Graf <agraf@suse.de>
Cc: Alexey Kardashevskiy <aik@ozlabs.ru>, Peter Maydell <peter.maydell@linaro.org>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Gerd Hoffmann <kraxel@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>

On Wed, 2014-06-18 at 01:05 +0200, Alexander Graf wrote:
> Given that, the prerequisite to that interface is to have a guest 
> exposed register to flip the endianness in the first place. I think it 
> makes most sense to settle on that register first, then talk about 
> potential backwards compat hacks that we could do on hypercalls with 
> that register.
> 
> Of course, the side effect that H_SET_MODE(LE) flips the VGA endianness 
> needs to be documented in sPAPR as well if we want to go down that path. 
> sPAPR is the hypercall specification we implement with -M pseries.

Yeah well, let's first get the base code done as discussed with Gerd
with the register, and we can keep that "optimization" separate and talk
again about it later.

I'll come up with patches in the next few days.

Cheers,
Ben.