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From: Peter Maydell <peter.maydell@linaro.org>
Date: Wed, 7 May 2014 10:40:02 +0100
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Subject: Re: [Qemu-devel] [PATCH v3 3/4] target-ppc: ppc can be either endian
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To: Alexander Graf <agraf@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>, QEMU Developers <qemu-devel@nongnu.org>, "qemu-ppc@nongnu.org" <qemu-ppc@nongnu.org>, "bharata@linux.vnet.ibm.com" <bharata@linux.vnet.ibm.com>, =?UTF-8?Q?Andreas_F=C3=A4rber?= <afaerber@suse.de>, Greg Kurz <gkurz@linux.vnet.ibm.com>

On 7 May 2014 10:37, Alexander Graf <agraf@suse.de> wrote:
>
>
>> Am 07.05.2014 um 11:26 schrieb Peter Maydell <peter.maydell@linaro.org>:
>>
>>> On 7 May 2014 10:09, Alexander Graf <agraf@suse.de> wrote:
>>> I don't think we should overengineer hacks for legacy virtio.
>>
>> Agreed. So what's our final conclusion: virtio endianness
>> is the endianness of the guest kernel at the point where
>> it triggers a reset of the virtio device, yes?
>
> The interrupt endianness for book3s PPC. Since that's an arch
> specific thing I think we should just make the determination
> mechanism arch dependent and list it in the spec.
>
> Booke for example would be vastly different since there is no
> global LE flag - it's a bit in the TLB entries.

Sure, but I think we should also state the general principle
we're aiming to implement with the arch specific detail,
so that people figuring out what a new arch should do
have a guide to follow.

thanks
-- PMM