From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from [140.186.70.92] (port=34263 helo=eggs.gnu.org)
	by lists.gnu.org with esmtp (Exim 4.43) id 1PAWBU-0000EC-LE
	for qemu-devel@nongnu.org; Mon, 25 Oct 2010 19:10:33 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <aliguori@linux.vnet.ibm.com>) id 1PAW7w-0001sg-OB
	for qemu-devel@nongnu.org; Mon, 25 Oct 2010 19:06:53 -0400
Received: from e1.ny.us.ibm.com ([32.97.182.141]:34576)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <aliguori@linux.vnet.ibm.com>) id 1PAW7w-0001re-M1
	for qemu-devel@nongnu.org; Mon, 25 Oct 2010 19:06:52 -0400
Received: from d01relay05.pok.ibm.com (d01relay05.pok.ibm.com [9.56.227.237])
	by e1.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id o9PMxEex003668
	for <qemu-devel@nongnu.org>; Mon, 25 Oct 2010 18:59:14 -0400
Received: from d01av03.pok.ibm.com (d01av03.pok.ibm.com [9.56.224.217])
	by d01relay05.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id
	o9PN6YtZ168096
	for <qemu-devel@nongnu.org>; Mon, 25 Oct 2010 19:06:34 -0400
Received: from d01av03.pok.ibm.com (loopback [127.0.0.1])
	by d01av03.pok.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id
	o9PN6YQQ011080
	for <qemu-devel@nongnu.org>; Mon, 25 Oct 2010 21:06:34 -0200
Message-ID: <4CC60D7B.7050002@linux.vnet.ibm.com>
Date: Mon, 25 Oct 2010 18:06:35 -0500
From: Anthony Liguori <aliguori@linux.vnet.ibm.com>
MIME-Version: 1.0
Subject: Re: [Qemu-devel] Re: backdoor
References: <cover.1287772322.git.vilanova@ac.upc.edu>	<AANLkTimNx5cXZ3bsvQaKdF5_in+2YF8jym0p=6ekFgcG@mail.gmail.com>	<87vd4q5yqd.fsf_-_@ginnungagap.bsc.es>
	<4CC5783C.8060009@redhat.com>	<87pquy4cn7.fsf@ginnungagap.bsc.es>
	<4CC5F4AE.6020306@codemonkey.ws> <87iq0prire.fsf@fulla.xlab.taz>
In-Reply-To: <87iq0prire.fsf@fulla.xlab.taz>
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: quoted-printable
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.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: <http://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
To: =?UTF-8?B?TGx1w61z?= <xscript@gmx.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org

On 10/25/2010 05:48 PM, Llu=C3=ADs wrote:
>> For instance, a CPUID leaf could be used in the 0x40001xxx range.
>>     =20
> Right, I commented this in a previous mail as a much nicer way to do it=
,
> but I was just too lazy to look up how CPUID works and instead ported
> the implementation I already had in bochs :)
>
> Although I can port it to CPUID if people find it useful to have
> upstream. I just need a way to provide an immediate and a register-base=
d
> argument (at the same time), which does not require executing more than
> a couple of extra instructions (right now everything fits on a single
> instruction).
>
> Being able te receive back information would be a plus, which I think
> CPUID already does to return its results; although I think the ISA says
> that _all_ registers are "used" after executing it.
>   =20

I think just the base 6 GP registers.  I don't think any of the extended=20
registers in 64-bit mode are affected but I would have to look it up.

Regards,

Anthony Liguori

> Lluis
>
>   =20