From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50890) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WMzqR-0003S8-CR for qemu-devel@nongnu.org; Mon, 10 Mar 2014 09:02:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WMzqK-0004nd-6R for qemu-devel@nongnu.org; Mon, 10 Mar 2014 09:02:15 -0400 Message-ID: <531DB7C6.5010204@redhat.com> Date: Mon, 10 Mar 2014 14:01:58 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <1394185045-24868-1-git-send-email-wudxw@linux.vnet.ibm.com> <1394185045-24868-2-git-send-email-wudxw@linux.vnet.ibm.com> <531994DF.4000503@redhat.com> <531B1A95.4030603@ozlabs.ru> <531CADCE.1080802@redhat.com> <531DAEA5.50208@ozlabs.ru> <531DAF5A.8090204@redhat.com> <531DB3DE.4010104@ozlabs.ru> In-Reply-To: <531DB3DE.4010104@ozlabs.ru> Content-Type: text/plain; charset=KOI8-R; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [Qemu-ppc] [PATCH v2 2/2] Fix return value of vga initlization on ppc List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexey Kardashevskiy , Mark Wu , qemu-devel@nongnu.org, qemu-ppc@nongnu.org Cc: afaerber@suse.de, aliguori@amazon.com, Alex Graf Il 10/03/2014 13:45, Alexey Kardashevskiy ha scritto: >>> As I was told in this list before, even with -nodefaults, QEMU should not >>> create a machine which is known for not working or not being supported. >>> Having VGA and not having any input device is kind of such a config, no? >> >> -nodefaults is exactly the opposite of that: no magic whatsoever. No VGA, >> no serial, nothing. > > qemu-system-x86_64 -enable-kvm -nographic -nodefaults -monitor stdio > > "info qtree" shows a whole bunch of devices like "i440FX-pcihost", > "isa-fdc", "piix3-ide", "vmmouse", "vmport" (what are the last two?). I was > told here that 8042 is to emulate A20, ok, but others - I do not really > understand. "q35" is bit different than "pc" but not smaller. The point was > made that there is no point in emulating a machine which does not exist in > the real world. Has it changed recently? -nodefaults should be the bare minimum that is necessary for the VM firmware to work. On x86, isa-fdc/vmmouse/vmport are there only for backwards compatibility reasons. >> And especially, with -nodefaults adding a VGA means just that: adding a VGA. > > Usual issue - libvirt expects keyboard with VGA and x86 provides this as it > always has keyboard. PPC does not have such default. I don't think it's even a libvirt bug. Then in the libvirt XML you should have: explicitly. If libvirt uses -nodefaults, it's up to virt-manager or oVirt or whatever management layer you're using to add all the necessary controllers (USB in this case) and devices (keyboard) for the machine to be usable. Paolo