From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([208.118.235.92]:43220)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <lcapitulino@redhat.com>) id 1SB8kk-0001IK-PT
	for qemu-devel@nongnu.org; Fri, 23 Mar 2012 13:58:20 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <lcapitulino@redhat.com>) id 1SB8kj-0004kK-3q
	for qemu-devel@nongnu.org; Fri, 23 Mar 2012 13:58:18 -0400
Received: from mx1.redhat.com ([209.132.183.28]:57280)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <lcapitulino@redhat.com>) id 1SB8ki-0004iH-RU
	for qemu-devel@nongnu.org; Fri, 23 Mar 2012 13:58:17 -0400
Date: Fri, 23 Mar 2012 14:58:17 -0300
From: Luiz Capitulino <lcapitulino@redhat.com>
Message-ID: <20120323145817.11e8101c@doriath.home>
In-Reply-To: <4F69DC3B.3050509@redhat.com>
References: <CABurPedHNnAewUhiZ8L4JiwRn_2g2Sq=F+GSi8qE2YKqLCRqHg@mail.gmail.com>
	<4F69DA5E.6010505@siemens.com> <4F69DC3B.3050509@redhat.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] Can VMX provide real mode support?
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: Avi Kivity <avi@redhat.com>
Cc: Jan Kiszka <jan.kiszka@siemens.com>, GaoYi <gaoyi709@gmail.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, kvm <kvm@vger.kernel.org>

On Wed, 21 Mar 2012 15:48:43 +0200
Avi Kivity <avi@redhat.com> wrote:

> On 03/21/2012 03:40 PM, Jan Kiszka wrote:
> > On 2012-03-21 13:38, GaoYi wrote:
> > > Hi Jan,
> > > 
> > >     Since the newest Intel-VT supports the guest OS under the real mode, which was already supported in AMD-V, can the VMX in the latest KVM support that case?
> >
> > Yes, both with our without that "unrestricted guest" support (as Intel
> > called it), real mode will generally work. Without that CPU feature, I
> > think to recall that there were some limitations for big real mode, not
> > sure.
> >
> 
> Yes, big real mode will not work without "unrestricted guest".  There
> was some work to emulate it (module option emulate_invalid_guest_state),
> but it is not complete.

Can you provide a pointer for this? series?