From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gleb Natapov Subject: Re: qemu-kvm: Inconsistent vgabios reference Date: Sun, 15 Jan 2012 15:36:25 +0200 Message-ID: <20120115133625.GG2167@redhat.com> References: <4F12C79E.8060902@redhat.com> <4F12C907.3070702@web.de> <4F12C9BF.7040406@redhat.com> <4F12CA17.9010604@web.de> <4F12CB51.4040502@redhat.com> <4F12CB9C.9010006@web.de> <4F12CC59.8090808@redhat.com> <4F12D056.2060605@msgid.tls.msk.ru> <4F12D226.803@redhat.com> <4F12D44B.2040208@msgid.tls.msk.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Avi Kivity , Jan Kiszka , Marcelo Tosatti , kvm To: Michael Tokarev Return-path: Received: from mx1.redhat.com ([209.132.183.28]:30762 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752805Ab2AONga (ORCPT ); Sun, 15 Jan 2012 08:36:30 -0500 Content-Disposition: inline In-Reply-To: <4F12D44B.2040208@msgid.tls.msk.ru> Sender: kvm-owner@vger.kernel.org List-ID: On Sun, Jan 15, 2012 at 05:27:39PM +0400, Michael Tokarev wrote: > On 15.01.2012 17:18, Avi Kivity wrote: > > On 01/15/2012 03:10 PM, Michael Tokarev wrote: > [] > >> FWIW, I had to patch extboot back in for debian qemu-kvm 1.0, because > >> of lack of boot support from scsi (and no alternative), and because > >> many people's scripts who used boot= broke. I thought it is better > >> to let users to have a chance to perform a smoother transition than > >> to break their stuff. > > > > It's really sad that people have to use lsi scsi. Luckily qemu 1.1 will > > feature virtio-scsi, though of course that doesn't help already > > installed guests or non Windows/Linux guests. Do you know what the use > > cases requiring scsi boot are? > > I've one (not very pleasant) bugreport handy, http://bugs.debian.org/652447 > and a few private messages asking me for ways to restore booting from scsi, > all talking about older/custom systems which worked for years in kvm. > As you can see in the bugreport mentioned, I know that scsi is broken > and should not be used and so on, and suggested switching from it on > every chance. > > >> Now, I've a question: what seabios implementation of extboot we're > >> talking about? -option-rom which is impossible to select as a first > >> boot device? > > > > seabios has native support for booting from virtio-blk, and will > > natively support virtio-scsi as well. > > Ah. Well, I thought especially about lsi emulated scsi. I wasn't > able to boot from it even with their bios -- once there's at least > one other bootable device present (including the NIC) it refuses > to boot from lsi emulated scsi drive. > Kevin is going to include a patch to Seabios to fix that. Meanwhile you can use bootindex to specify boot order. -- Gleb.