From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
	id 1NAkvf-00082F-Gh
	for qemu-devel@nongnu.org; Wed, 18 Nov 2009 08:50:39 -0500
Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
	id 1NAkvY-0007yj-Ld
	for qemu-devel@nongnu.org; Wed, 18 Nov 2009 08:50:37 -0500
Received: from [199.232.76.173] (port=43647 helo=monty-python.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1NAkvY-0007yT-AP
	for qemu-devel@nongnu.org; Wed, 18 Nov 2009 08:50:32 -0500
Received: from mx1.redhat.com ([209.132.183.28]:46608)
	by monty-python.gnu.org with esmtp (Exim 4.60)
	(envelope-from <avi@redhat.com>) id 1NAkvX-0003zV-Mf
	for qemu-devel@nongnu.org; Wed, 18 Nov 2009 08:50:31 -0500
Message-ID: <4B03FB9C.8040407@redhat.com>
Date: Wed, 18 Nov 2009 15:50:20 +0200
From: Avi Kivity <avi@redhat.com>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] Stack corruption problem with SeaBIOS/gPXE under QEMU
References: <4AFBEF9A.5010802@redhat.com>
	<20091114194745.GA12007@morn.localdomain>
	<4B01555B.1030109@redhat.com> <4B015B6C.4090000@redhat.com>
	<20091117022620.GA25962@morn.localdomain>
	<20091118093949.GA18543@redhat.com>
In-Reply-To: <20091118093949.GA18543@redhat.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
List-Id: qemu-devel.nongnu.org
List-Unsubscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.gnu.org/pipermail/qemu-devel>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: Gleb Natapov <gleb@redhat.com>
Cc: qemu-devel@nongnu.org, Glauber Costa <glommer@redhat.com>, Kevin O'Connor <kevin@koconnor.net>, gpxe@etherboot.org, Naphtali Sprei <nsprei@redhat.com>

On 11/18/2009 11:39 AM, Gleb Natapov wrote:
>
>> Hi Avi,
>>
>> Can you send the full qemu command line that you used?  I can't seem
>> to reproduce this on my setup.
>>
>> I do see an issue if SeaBIOS's reboot vector is called (eg, by using
>> "sendkey ctrl-alt-delete" while still in the bios) because seabios
>> allows gpxe to modify itself, and on a seabios only reboot the gpxe
>> rom isn't recopied and gpxe therefore gets confused.  However, on a
>> linux invoked reboot, it looks like a full machine reset occurs and
>> qemu recopies the gpxe rom, so that doesn't seem to be an issue.
>>
>>      
> Do we have the same problem with tpr patching rom (vapic,bin)? It modifies
> itself too.
>    

But a reset will reload it.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.