From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:46756)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1c4DDB-0000Pn-UJ
	for qemu-devel@nongnu.org; Tue, 08 Nov 2016 15:41:42 -0500
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <paolo.bonzini@gmail.com>) id 1c4DD8-0002lc-SI
	for qemu-devel@nongnu.org; Tue, 08 Nov 2016 15:41:41 -0500
Received: from mail-wm0-x244.google.com ([2a00:1450:400c:c09::244]:36734)
	by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16)
	(Exim 4.71) (envelope-from <paolo.bonzini@gmail.com>)
	id 1c4DD8-0002lY-L5
	for qemu-devel@nongnu.org; Tue, 08 Nov 2016 15:41:38 -0500
Received: by mail-wm0-x244.google.com with SMTP id c17so24997400wmc.3
	for <qemu-devel@nongnu.org>; Tue, 08 Nov 2016 12:41:38 -0800 (PST)
Sender: Paolo Bonzini <paolo.bonzini@gmail.com>
References: <cover.1478619442.git.vpalatin@chromium.org>
	<5a5399c5-a8bb-bfcb-8bc5-8aaad9749aa0@redhat.com>
	<CAP_ceTwvtCLW8U-jSPpZ13zYf+cPVx67DDnrtTmuvV7Tq7=zLg@mail.gmail.com>
From: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <6cc211ce-7af1-c125-66cd-14b701f95f62@redhat.com>
Date: Tue, 8 Nov 2016 21:41:34 +0100
MIME-Version: 1.0
In-Reply-To: <CAP_ceTwvtCLW8U-jSPpZ13zYf+cPVx67DDnrtTmuvV7Tq7=zLg@mail.gmail.com>
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 7bit
Subject: Re: [Qemu-devel] [PATCH 0/3] [RFC] Add HAX 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: Vincent Palatin <vpalatin@chromium.org>
Cc: qemu-devel <qemu-devel@nongnu.org>



On 08/11/2016 20:41, Vincent Palatin wrote:
> >   If so, I think we should only support those
> > processors and slash all the part related to HAX_EMULATE_STATE_INITIAL
> > and HAX_EMULATE_STATE_REAL.  This would probably let us make patch 3
> > much less intrusive.
> 
> Sure the whole patchset would be lighter, not sure which proportion of
> user have VT machines without UG support though.

All Intel machines sold after ~2010 should have unrestricted guest
support.  (HAX doesn't support AMD, but anyway AMD's virt extensions
have always had the equivalent feature).

I'm not sure we want !UG support at all but, if we do, QEMU 2.9 will
have multithreaded TCG so it would be possible to make it less
intrusive.  So it's worth starting with the minimum patchset and see
what happens.

Thanks for working on this!

Paolo