From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:46057) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dUwS9-0005cO-1r for qemu-devel@nongnu.org; Tue, 11 Jul 2017 10:47:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dUwS5-0002e5-6p for qemu-devel@nongnu.org; Tue, 11 Jul 2017 10:47:53 -0400 Received: from mail-wr0-f173.google.com ([209.85.128.173]:35714) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1dUwS5-0002dk-0L for qemu-devel@nongnu.org; Tue, 11 Jul 2017 10:47:49 -0400 Received: by mail-wr0-f173.google.com with SMTP id k67so2280117wrc.2 for ; Tue, 11 Jul 2017 07:47:48 -0700 (PDT) References: <5233eee1-a017-ccae-3458-762c9e86902c@redhat.com> <20170707133949.GH10776@localhost.localdomain> <20170707181642-mutt-send-email-mst@kernel.org> <20170707180358.GA12152@localhost.localdomain> <626ce419-8418-a4a2-88d3-b61bf20bbb32@redhat.com> <20170710135943.GG12152@localhost.localdomain> <20170710194345-mutt-send-email-mst@kernel.org> <20170710174730.GL12152@localhost.localdomain> <063778b8-d517-dcac-3c83-95076604a16c@redhat.com> <1499760785.8257.5.camel@redhat.com> <20170711144215.GI4335@noname.str.redhat.com> From: Paolo Bonzini Message-ID: <1cc3488e-d40b-ac73-9087-f2bf64f2cd1c@redhat.com> Date: Tue, 11 Jul 2017 16:47:45 +0200 MIME-Version: 1.0 In-Reply-To: <20170711144215.GI4335@noname.str.redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] change x86 default machine type to Q35? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Kevin Wolf , Gerd Hoffmann Cc: "Tian, Kevin" , Eduardo Habkost , "Michael S. Tsirkin" , libvir-list@redhat.com, Thomas Huth , qemu-devel@nongnu.org, Chao Peng , Marcel Apfelbaum , Laszlo Ersek On 11/07/2017 16:42, Kevin Wolf wrote: >>> Concerning QEMU, could we maybe simply emit a warning a la >>> >>> "you did not specify a machine type with the -M option, so you are >>> currently running the the 'pc' machine type. Please note that >>> future >>> versions of QEMU might use the 'q35' machine type instead. If you >>> require the 'pc' machine type for your setting, then please specify >>> it with the -M option." >> Warnings tend to get ignored until things are actually break, so I >> don't think this helps much. I think simply not having a default >> machine type (as already suggested elsewhere in this thread) is the >> best way to deal with this. > I would absolutely hate this. One of the nice things about qemu has > always been that 'qemu disk.img' is enough to start a simple VM. You > only need to touch any other options for things you care about. I > wouldn't want to give this up. I agree. Don't change anything, leave "-M pc" aside, and let libosinfo pick q35 for newer guests. Paolo