From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:53952) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fQBtO-0000vS-Ug for qemu-devel@nongnu.org; Tue, 05 Jun 2018 09:20:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fQBtL-00077E-Pp for qemu-devel@nongnu.org; Tue, 05 Jun 2018 09:20:54 -0400 Received: from mail-wm0-x241.google.com ([2a00:1450:400c:c09::241]:38567) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fQBtL-00076a-Ie for qemu-devel@nongnu.org; Tue, 05 Jun 2018 09:20:51 -0400 Received: by mail-wm0-x241.google.com with SMTP id m129-v6so5060863wmb.3 for ; Tue, 05 Jun 2018 06:20:51 -0700 (PDT) References: <20180603092749.107476-1-marcel.apfelbaum@gmail.com> <20180604042928-mutt-send-email-mst@kernel.org> <23040757-b561-e0bf-a41d-38d3c44555ee@gmail.com> <20180605072746.v6xxabsbewiuw7ka@sirius.home.kraxel.org> <20180605084300.GF32286@redhat.com> From: Marcel Apfelbaum Message-ID: <53c37321-52d2-732c-19fb-8f6a9542c714@gmail.com> Date: Tue, 5 Jun 2018 16:20:46 +0300 MIME-Version: 1.0 In-Reply-To: <20180605084300.GF32286@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Subject: Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: "=?UTF-8?Q?Daniel_P._Berrang=c3=a9?=" , Gerd Hoffmann Cc: pbonzini@redhat.com, rth@twiddle.net, qemu-devel@nongnu.org, ehabkost@redhat.com, "Michael S. Tsirkin" On 06/05/2018 11:43 AM, Daniel P. Berrangé wrote: > On Tue, Jun 05, 2018 at 09:27:46AM +0200, Gerd Hoffmann wrote: >> Hi, >> >>>> Add to that shortcuts like -cdrom >>>> stop working, >>> Maybe is fixable. >> Already fixed for ages. >> >>> I see marking Q35 as the default machine a first step. >> Maybe the better option is to go the arm route: Just don't define a >> default, so users have to specify pc or q35. That will make them notice >> there is a world beside 'pc', and we also avoid breaking things >> silently. It can work, sure. And we can add user hints: "Use q35 for ...., select pc if..." > If QEMU removes the default, then libvirt will have to hardcode > 'pc' as the default to maintain back compatibility, so I don't > think that ends up as a net win Can't libvirt preserve 'pc' for existing domains, while defaulting to q35 the creation of new domains ? This way it aligns with Gerd's proposal of no default x86 machine. Thanks, Marcel > > Regards, > Daniel