From mboxrd@z Thu Jan  1 00:00:00 1970
Received: from eggs.gnu.org ([2001:4830:134:3::10]:49312)
	by lists.gnu.org with esmtp (Exim 4.71)
	(envelope-from <armbru@redhat.com>) id 1XKB9F-0001BC-GR
	for qemu-devel@nongnu.org; Wed, 20 Aug 2014 15:02:22 -0400
Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71)
	(envelope-from <armbru@redhat.com>) id 1XKB9A-0005dN-P3
	for qemu-devel@nongnu.org; Wed, 20 Aug 2014 15:02:17 -0400
Received: from mx1.redhat.com ([209.132.183.28]:26213)
	by eggs.gnu.org with esmtp (Exim 4.71)
	(envelope-from <armbru@redhat.com>) id 1XKB9A-0005dF-Hc
	for qemu-devel@nongnu.org; Wed, 20 Aug 2014 15:02:12 -0400
Received: from int-mx11.intmail.prod.int.phx2.redhat.com
	(int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24])
	by mx1.redhat.com (8.14.4/8.14.4) with ESMTP id s7KJ2AmO019569
	(version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256
	verify=OK)
	for <qemu-devel@nongnu.org>; Wed, 20 Aug 2014 15:02:11 -0400
From: Markus Armbruster <armbru@redhat.com>
References: <20140820153431.15111.3916.stgit@fimbulvetr.bsc.es>
	<87ppfvqfao.fsf@blackfin.pond.sub.org>
	<87r40bko80.fsf@fimbulvetr.bsc.es>
Date: Wed, 20 Aug 2014 21:02:07 +0200
In-Reply-To: <87r40bko80.fsf@fimbulvetr.bsc.es> (=?utf-8?Q?=22Llu=C3=ADs?=
	Vilanova"'s message of "Wed, 20 Aug 2014 20:30:55 +0200")
Message-ID: <871tsbnfww.fsf@blackfin.pond.sub.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
Subject: Re: [Qemu-devel] [PATCH v2] trace: [qmp] Add QAPI/QMP commands to
	query and control event tracing state
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: qemu-devel@nongnu.org
Cc: Stefan Hajnoczi <stefanha@redhat.com>, Luiz Capitulino <lcapitulino@redhat.com>

Llu=C3=ADs Vilanova <vilanova@ac.upc.edu> writes:

> Markus Armbruster writes:
>
>> Llu=C3=ADs Vilanova <vilanova@ac.upc.edu> writes:
>>> Also removes old "trace-event", "trace-file" and "info trace-events" HMP
>>> commands.
>
>> We gain the ability to control trace via QMP, but lose the ability to
>> control it via HMP, correct?
>
> Right. I can keep the HMP commands, but doing so requires exposing the in=
ternal
> trace event identifier number in the QMP interface. Also, "trace-file" ca=
nnot be
> implemented on top of the current QMP commands, and is specific to the "s=
imple"
> tracing backend.

Would rough feature-parity with QMP be feasible with new HMP commands on
top of the QMP interfaces, completely ignoring HMP backward
compatibility?

[...]