From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:44543)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1ZxAQE-0000Ih-Oj
	for qemu-devel@nongnu.org; Fri, 13 Nov 2015 04:13:31 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1ZxAQA-0002aK-UH
	for qemu-devel@nongnu.org; Fri, 13 Nov 2015 04:13:30 -0500
Received: from mx1.redhat.com ([209.132.183.28]:37963)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <kraxel@redhat.com>) id 1ZxAQA-0002ZF-OW
	for qemu-devel@nongnu.org; Fri, 13 Nov 2015 04:13:26 -0500
Received: from int-mx13.intmail.prod.int.phx2.redhat.com
	(int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26])
	by mx1.redhat.com (Postfix) with ESMTPS id D13131309
	for <qemu-devel@nongnu.org>; Fri, 13 Nov 2015 09:13:25 +0000 (UTC)
Message-ID: <1447406002.1400.94.camel@redhat.com>
From: Gerd Hoffmann <kraxel@redhat.com>
Date: Fri, 13 Nov 2015 10:13:22 +0100
In-Reply-To: <1447341076-11573-2-git-send-email-marcel@redhat.com>
References: <1447341076-11573-1-git-send-email-marcel@redhat.com>
	<1447341076-11573-2-git-send-email-marcel@redhat.com>
Content-Type: text/plain; charset="UTF-8"
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH 1/4] hw/pxb: remove the built-in pci bridge
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: Marcel Apfelbaum <marcel@redhat.com>
Cc: rth@twiddle.ne, ehabkost@redhat.com, mst@redhat.com, qemu-devel@nongnu.org, imammedo@redhat.com, pbonzini@redhat.com

On Do, 2015-11-12 at 17:11 +0200, Marcel Apfelbaum wrote:
> As part of porting the pxb device to Q35 remove the internal pci-2-pci
> bridge. The only way to hot-pug devices on the extra PCI root buses
> is by adding a pci-2-pci to the pxb before the firmware assign the
> IO/mem resources.

I think this breaks live migration and is guest-visible too.  So not
going to fly without backward-compatibility mode for old machine
types ...

Possibly it is easier to just have have pci and pcie pxb devices look
differenty rather than adding all the compatibility fluff.

cheers,
  Gerd