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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch
 dispatching to memory core layer
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To: Alexander Graf <agraf@suse.de>
Cc: Liu Ping Fan <pingfank@linux.vnet.ibm.com>, qemu-devel Developers <qemu-devel@nongnu.org>, "qemu-ppc@nongnu.org list:PowerPC" <qemu-ppc@nongnu.org>, Paolo Bonzini <pbonzini@redhat.com>, Jan Kiszka <jan.kiszka@web.de>, Andreas =?ISO-8859-1?Q?F=E4rber?= <afaerber@suse.de>, =?ISO-8859-1?Q?Herv=E9?= Poussineau <hpoussin@reactos.org>

On Thu, 2013-07-11 at 15:28 +0200, Alexander Graf wrote:
> 
> Semantically having your PCI host bridge do the endianness conversion
> is the correct way of handling it, as that's where the conversion
> happens. If it makes life easier to do it in the isa bridging code,
> that's fine for me too though. But then we'll have to get rid of all
> endianness swaps that already happen in PCI bridges.

BTW. Why would IOs to a PCI VGA device go through an "ISA bridge" of any
kind ? PCI IO space is PCI IO space... whether there is an ISA bridge or
not is a separate thing and PCI VGA cards certainly don't sit behind
one.

Ben.