From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:55701) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UeoP8-000419-1H for qemu-devel@nongnu.org; Tue, 21 May 2013 11:23:12 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UeoKM-0004fU-SR for qemu-devel@nongnu.org; Tue, 21 May 2013 11:18:17 -0400 Received: from mail-pd0-f172.google.com ([209.85.192.172]:42950) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UeoKM-0004fG-K7 for qemu-devel@nongnu.org; Tue, 21 May 2013 11:18:14 -0400 Received: by mail-pd0-f172.google.com with SMTP id 10so720347pdi.31 for ; Tue, 21 May 2013 08:18:13 -0700 (PDT) Message-ID: <519B9027.4@gmail.com> Date: Tue, 21 May 2013 23:17:59 +0800 From: Li Zhang MIME-Version: 1.0 References: <519B2E24.40104@gmail.com> <20130521083953.GB31290@redhat.com> <20130521095527.GB29303@iris.ozlabs.ibm.com> In-Reply-To: <20130521095527.GB29303@iris.ozlabs.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] [qemu-devel][libvirt] Default machine type setting for ppc64 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Paul Mackerras Cc: Peter Maydell , libvir-list@redhat.com, "qemu-devel@nongnu.org" , anthony@codemonkey.ws, Pradipta Kumar Banerjee On 2013年05月21日 17:55, Paul Mackerras wrote: > On Tue, May 21, 2013 at 09:39:53AM +0100, Daniel P. Berrange wrote: >> On Tue, May 21, 2013 at 09:31:26AM +0100, Peter Maydell wrote: >>> On 21 May 2013 09:19, Li Zhang wrote: >>>> We encounter this problem in openstack which always use >>>> default machine type. Currently, QEMU sets mac99 as default >>>> setting for ppc64 but it doesn't work on our platform at all. >>>> >>>> I tried to fix this in libvirt which it is not acceptable because >>>> libvirt only considers to get default setting from QEMU. >>> This will need to be fixed for ARM -- the whole idea of there >>> being a sensible "default machine type" and it being the one >>> QEMU starts by default is pretty x86-centric. libvirt needs >>> to have support for specifying which machine to use. >> Libvirt has always had support for specifying what machine type to use. >> This discussion is simply about what machine type to default to, if the >> user hasn't explicitly asked for one. > So, the situation is that the XML in question has hvm, > in the section. Does that say anything about what type of > machine is being requested? Why is the machine type in the > section rather than the section? > >> QEMU has the notion of a default machine for each target, and that is >> what libvirt uses if the user hasn't specified a machine. It is not >> libvirt's job to override QEMU's notion of the default machine here, >> so if the 'mac99' machine type isn't suitable as the default either >> QEMU needs to change that for the ppc target, or the user needs to >> explicitly specify their desired machine type. > We are getting the default changed to 'pseries', at least for cases > where pseries support is compiled in, which isn't necessarily > always. That will of course not satisfy the Freescale guys. You are right. This default setting can't satisfy every platform. So it will needs management tool to add one machine type option, if it wants to support different machine types for ppc64. Thanks. :) > I think libvirt needs some more sensible way to ask qemu what its > capabilities are. Currently it has no way to ask qemu "what machines > can you emulate with kvm acceleration?" If the user has asked for a > KVM domain then the default machine should be one that can be provided > by KVM. At present it isn't, on PowerPC. > > Paul. >