From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=56503 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Pg0Lm-0000vE-7w for qemu-devel@nongnu.org; Thu, 20 Jan 2011 14:39:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Pg0Ll-0001xd-8G for qemu-devel@nongnu.org; Thu, 20 Jan 2011 14:39:18 -0500 Received: from e5.ny.us.ibm.com ([32.97.182.145]:53690) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Pg0Ll-0001xO-3a for qemu-devel@nongnu.org; Thu, 20 Jan 2011 14:39:17 -0500 Received: from d01dlp02.pok.ibm.com (d01dlp02.pok.ibm.com [9.56.224.85]) by e5.ny.us.ibm.com (8.14.4/8.13.1) with ESMTP id p0KJFicS016964 for ; Thu, 20 Jan 2011 14:15:48 -0500 Received: from d01relay04.pok.ibm.com (d01relay04.pok.ibm.com [9.56.227.236]) by d01dlp02.pok.ibm.com (Postfix) with ESMTP id 401624DE8026 for ; Thu, 20 Jan 2011 14:35:54 -0500 (EST) Received: from d03av06.boulder.ibm.com (d03av06.boulder.ibm.com [9.17.195.245]) by d01relay04.pok.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id p0KJdDNm195448 for ; Thu, 20 Jan 2011 14:39:13 -0500 Received: from d03av06.boulder.ibm.com (loopback [127.0.0.1]) by d03av06.boulder.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id p0KJhh7L028381 for ; Thu, 20 Jan 2011 12:43:43 -0700 Message-ID: <4D388F60.5070001@linux.vnet.ibm.com> Date: Thu, 20 Jan 2011 13:39:12 -0600 From: Anthony Liguori MIME-Version: 1.0 Subject: Re: [Qemu-devel] [PATCH 28/35] kvm: x86: Introduce kvmclock device to save/restore its state References: <4D35B6DD.1020005@linux.vnet.ibm.com> <4D35B963.7000605@siemens.com> <4D35BA22.7060602@linux.vnet.ibm.com> <4D35BD30.1060900@siemens.com> <4D35C1CE.10509@linux.vnet.ibm.com> <4D35C648.7050809@siemens.com> <4D35C92D.7030000@linux.vnet.ibm.com> <4D36B362.70202@redhat.com> <4D371732.5040901@linux.vnet.ibm.com> <20110119171918.GI5113@redhat.com> <4D3722BB.5030407@linux.vnet.ibm.com> <4D37F5D5.3040409@redhat.com> In-Reply-To: <4D37F5D5.3040409@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gerd Hoffmann Cc: "kvm@vger.kernel.org" , Jan Kiszka , Glauber Costa , Marcelo Tosatti , Markus Armbruster , "qemu-devel@nongnu.org" , Avi Kivity On 01/20/2011 02:44 AM, Gerd Hoffmann wrote: > Hi, > >> For (2), you cannot use bus=X,addr=Y because it makes assumptions about >> the PCI topology which may change in newer -M pc's. > > Why should the PCI topology for 'pc' ever change? > > We'll probably get q35 support some day, but when this lands I expect > we'll see a new machine type 'q35', so '-m q35' will pick the ich9 > chipset (which will have a different pci topology of course) and '-m > pc' will pick the existing piix chipset (which will continue to look > like it looks today). But then what's the default machine type? When I say -M pc, I really mean the default machine. At some point, "qemu-system-x86_64 -device virtio-net-pci,addr=2.0" Is not going to be a reliable way to invoke qemu because there's no way we can guarantee that slot 2 isn't occupied by a chipset device or some other default device. Regards, Anthony Liguori > cheers, > Gerd