From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:35729) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YzOoy-0005os-B7 for qemu-devel@nongnu.org; Mon, 01 Jun 2015 08:28:01 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1YzOot-0000sm-SJ for qemu-devel@nongnu.org; Mon, 01 Jun 2015 08:28:00 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56721) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1YzOot-0000sZ-HQ for qemu-devel@nongnu.org; Mon, 01 Jun 2015 08:27:55 -0400 Received: from int-mx11.intmail.prod.int.phx2.redhat.com (int-mx11.intmail.prod.int.phx2.redhat.com [10.5.11.24]) by mx1.redhat.com (Postfix) with ESMTPS id 38B06B82B8 for ; Mon, 1 Jun 2015 12:27:55 +0000 (UTC) Date: Mon, 1 Jun 2015 14:27:52 +0200 From: "Michael S. Tsirkin" Message-ID: <20150601142731-mutt-send-email-mst@redhat.com> References: <1432568042-19553-1-git-send-email-marcel@redhat.com> <1432568042-19553-24-git-send-email-marcel@redhat.com> <20150531181221.GJ5268@redhat.com> <556C2985.9000909@redhat.com> <1433158819.19671.23.camel@nilsson.home.kraxel.org> <20150601141532-mutt-send-email-mst@redhat.com> <556C4E3F.7050102@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <556C4E3F.7050102@redhat.com> Subject: Re: [Qemu-devel] [PATCH V7 23/24] apci: fix PXB behaviour if used with unsupported BIOS List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Marcel Apfelbaum Cc: pbonzini@redhat.com, Laszlo Ersek , Gerd Hoffmann , qemu-devel@nongnu.org On Mon, Jun 01, 2015 at 03:21:19PM +0300, Marcel Apfelbaum wrote: > On 06/01/2015 03:17 PM, Michael S. Tsirkin wrote: > >On Mon, Jun 01, 2015 at 01:40:19PM +0200, Gerd Hoffmann wrote: > >>On Mo, 2015-06-01 at 12:44 +0300, Marcel Apfelbaum wrote: > >>>On 05/31/2015 09:12 PM, Michael S. Tsirkin wrote: > >>>>On Mon, May 25, 2015 at 06:34:01PM +0300, Marcel Apfelbaum wrote: > >>>>>PXB does not work with unsupported bioses, but should > >>>>>not interfere with normal OS operation. > >>>>>We don't ship them anymore, but it's reasonable > >>>>>to keep the work-around until we update the bios in qemu. > >>>> > >>>>We already did, did we not? > >>>Yes, we did, but Gerd preferred to keep this patch around. > >>>Adding him to thread. > >> > >>seabios bundled with qemu isn't the only possible firmware. > >> > >>We have ovmf, coreboot, qboot. > > > >ovmf is especially interesting. Marcel, did you look at what > >happens with pxb and ovmf? > No, I talked to Laszlo about it, he said ovmf is not there yet. > OVMF will not query the extra buses, so the devices on the extra bus will not be visible. > Adding him to the thread. > > Thanks, > Marcel But does OVMF need this specific patch? > > > >>You might boot with old seabios for > >>whatever reasons (say bisecting down something). > > > >But then you won't have pxb, will you? > > > >>IMO qemu should deal > >>with pxe not being initialized by the firmware in a sensible way, for > >>robustness reasons. > >> > >>cheers, > >> Gerd > >>