From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:48722)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <benh@kernel.crashing.org>) id 1Wwrxs-00038R-0l
	for qemu-devel@nongnu.org; Tue, 17 Jun 2014 07:54:18 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <benh@kernel.crashing.org>) id 1Wwrxj-0001K3-BE
	for qemu-devel@nongnu.org; Tue, 17 Jun 2014 07:54:11 -0400
Received: from gate.crashing.org ([63.228.1.57]:50549)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <benh@kernel.crashing.org>) id 1Wwrxj-0001Jp-1i
	for qemu-devel@nongnu.org; Tue, 17 Jun 2014 07:54:03 -0400
Message-ID: <1403006031.7661.150.camel@pasglop>
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Tue, 17 Jun 2014 21:53:51 +1000
In-Reply-To: <20140617134057.157e6acf@bahia.local>
References: <1402974463.7661.102.camel@pasglop>
	<539FC6B9.6060003@redhat.com> <1402981184.7661.107.camel@pasglop>
	<539FD3F1.2010304@redhat.com> <53A007D3.2090604@ozlabs.ru>
	<20140617120044.3ae839fa@bahia.local>
	<1402999758.7661.129.camel@pasglop>
	<20140617134057.157e6acf@bahia.local>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [RFC] qemu VGA endian swap low level drawing
 changes
List-Id: <qemu-devel.nongnu.org>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Greg Kurz <gkurz@linux.vnet.ibm.com>
Cc: Peter Maydell <peter.maydell@linaro.org>, Alexey Kardashevskiy <aik@ozlabs.ru>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Alexander Graf <agraf@suse.de>, Gerd Hoffmann <kraxel@redhat.com>, Paolo Bonzini <pbonzini@redhat.com>

On Tue, 2014-06-17 at 13:40 +0200, Greg Kurz wrote:
> This conclusion was reached while discussing dump support where we
> use LPCR_ILE, and I wanted to add a common helper to be used by
> virtio. Please find the thread in the link below:
> 
> https://lists.nongnu.org/archive/html/qemu-devel/2014-05/msg00415.html
> 
> Can you elaborate on the "less sense" opinion please ?

I can't fathom how the endianness of a specific CPU at the point of the
reset makes any sense vs. the overall endianness of the system.

But this is all very theorical, fact is they will always match on
powerpc, so I don't care that much :)

In any case, for VGA, the right long term approach is a register in
the adapter. Though we might want to keep the trick of forcing it when
a PAPR guest does the H_SET_MODE hcall for general compatibility with
existing guests, after all it's a paravirt interface, we can have side
effects like that....

Cheers,
Ben.