From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:37065)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <anthony@codemonkey.ws>) id 1UykId-0005yA-G9
	for qemu-devel@nongnu.org; Mon, 15 Jul 2013 11:02:53 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <anthony@codemonkey.ws>) id 1UykIc-0005WD-AG
	for qemu-devel@nongnu.org; Mon, 15 Jul 2013 11:02:51 -0400
Received: from mail-ie0-f172.google.com ([209.85.223.172]:33717)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <anthony@codemonkey.ws>) id 1UykIc-0005Vs-5W
	for qemu-devel@nongnu.org; Mon, 15 Jul 2013 11:02:50 -0400
Received: by mail-ie0-f172.google.com with SMTP id 16so26130856iea.31
	for <qemu-devel@nongnu.org>; Mon, 15 Jul 2013 08:02:49 -0700 (PDT)
From: Anthony Liguori <anthony@codemonkey.ws>
In-Reply-To: <51E2A614.5010402@ozlabs.ru>
References: <1373614639-15523-1-git-send-email-aik@ozlabs.ru>
	<20130713080309.GA11522@voom.redhat.com>
	<51E2A614.5010402@ozlabs.ru>
Date: Mon, 15 Jul 2013 10:02:42 -0500
Message-ID: <87vc4bamst.fsf@codemonkey.ws>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Subject: Re: [Qemu-devel] [PATCH] spapr-pci: change endianness for io ports
	space
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: Alexey Kardashevskiy <aik@ozlabs.ru>, David Gibson <david@gibson.dropbear.id.au>
Cc: qemu-ppc@nongnu.org, qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>

Alexey Kardashevskiy <aik@ozlabs.ru> writes:

> On 07/13/2013 06:03 PM, David Gibson wrote:
>> On Fri, Jul 12, 2013 at 05:37:19PM +1000, Alexey Kardashevskiy wrote:
>>> sPAPR PHB emulates IO ports on PCI via a special memory region which
>>> routes all reads/writes further via cpu_in*/cpu_out* which are eventually
>>> processed by MemoryRegionOps implemented by devices.
>
>> Hrm.  That double dispatch was a workaround for bugs in the plain
>> memory region dispatching which meant we couldn't directly map regions
>> in memory space to IO areas.
>> 
>> It would be worth checking if that workaround is still necessary.
>
> Hm. Good point, thanks! It seems memory_region_init_io is not necessary any
> more. Will make a patch for it.

You should try the latest qemu.git commit.  There shouldn't be a problem
anymore.

Regards,

Anthony Liguori

>
>
> -- 
> Alexey