From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:51803) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ctGvl-0004EO-Ih for qemu-devel@nongnu.org; Wed, 29 Mar 2017 12:58:46 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ctGvg-00045x-Kt for qemu-devel@nongnu.org; Wed, 29 Mar 2017 12:58:45 -0400 Received: from mx1.redhat.com ([209.132.183.28]:47096) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ctGvg-00045q-Ey for qemu-devel@nongnu.org; Wed, 29 Mar 2017 12:58:40 -0400 Received: from smtp.corp.redhat.com (int-mx16.intmail.prod.int.phx2.redhat.com [10.5.11.28]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3F8A83710D5 for ; Wed, 29 Mar 2017 16:58:39 +0000 (UTC) References: <3d1c16a1-ec05-0367-e569-64a63b34f2e3@redhat.com> <4a56f716-3528-ddd4-f8c4-f3f6b23c469a@redhat.com> <3044459b-65a3-ca78-c009-15de9823704a@redhat.com> <20170329164646.GD2501@work-vm> From: Paolo Bonzini Message-ID: <0eebf55d-aeb9-5426-001d-175b0cbfc60c@redhat.com> Date: Wed, 29 Mar 2017 18:58:36 +0200 MIME-Version: 1.0 In-Reply-To: <20170329164646.GD2501@work-vm> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Subject: Re: [Qemu-devel] Deprecating old machine types List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "Dr. David Alan Gilbert" , Thomas Huth Cc: qemu-devel@nongnu.org, John Snow , "Michael S. Tsirkin" , Juan Quintela On 29/03/2017 18:46, Dr. David Alan Gilbert wrote: >> By the way, what about old machine types like "pc-0.10" ? Do we want t= o >> carry them along forever (e.g. since it is not too complicated to >> maintain?), or shall we get rid of those one day (e.g. with QEMU 3.0),= too? > It seems reasonable to slowly deprecate them. > I'm just not sure how slowly. Some data: - dropping 0.12, 0.13 _and_ isapc would let us kill the code for rombar=3D0 (i.e. where QEMU copies ROM BARs directly to low memory). - the oldest versions in use are probably 0.12 (CentOS 6) and 1.0 (Ubuntu 12.04) - migration from old versions is broken in various ways from at least QEMU 1.2 and older. Paolo