From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([140.186.70.92]:39493)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <Alexey.Korolev@endace.com>) id 1RgUk1-0001nW-Ce
	for qemu-devel@nongnu.org; Fri, 30 Dec 2011 00:10:54 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <Alexey.Korolev@endace.com>) id 1RgUk0-000367-9V
	for qemu-devel@nongnu.org; Fri, 30 Dec 2011 00:10:53 -0500
Received: from usrksweb02.endace.com ([174.143.168.194]:44672)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <Alexey.Korolev@endace.com>) id 1RgUk0-00035v-4z
	for qemu-devel@nongnu.org; Fri, 30 Dec 2011 00:10:52 -0500
Message-ID: <4EFD47B5.800@endace.com>
Date: Fri, 30 Dec 2011 18:10:13 +1300
From: Alexey Korolev <alexey.korolev@endace.com>
MIME-Version: 1.0
References: <4EFA9DF0.7050902@endace.com> <4EFAAABB.3020804@endace.com>
	<20111228114302.GB26310@redhat.com> <4EFBFD90.3020705@endace.com>
	<20111229162107.GF2300@redhat.com>
In-Reply-To: <20111229162107.GF2300@redhat.com>
Content-Type: text/plain; charset="ISO-8859-1"; format=flowed
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH 3/3] Changes related to secondary buses and
	64bit regions
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: "Michael S. Tsirkin" <mst@redhat.com>
Cc: sfd@endace.com, yamahata@valinux.co.jp, seabios@seabios.org, qemu-devel@nongnu.org

On 30/12/11 05:21, Michael S. Tsirkin wrote:
> On Thu, Dec 29, 2011 at 06:41:36PM +1300, Alexey Korolev wrote:
>>> Can't figure this out. What does this do?
>> Bios will panic if it founds prefmem BARs in both 32bit and 64bit areas.
> That's not good, it's a legal configuration.
>
To be more complete : Bios will panic if it founds prefmem BARs in both 
32bit and 64bit areas
on the same secondary Bus.
I agree about that this limitation is too strict at the moment. But this 
is just a limitation, there are
plenty of them in Seabios.

To answer if it is a legal or not we need to have a look how real BIOS 
would behave in a such
scenario. Unfortunately I have no chance to have this configuration on 
hand. If you have (may
have) this I would appreciate if you let us know how the Bios will behave?