From mboxrd@z Thu Jan  1 00:00:00 1970
From: Gerd Hoffmann <kraxel@redhat.com>
Subject: Re: [PATCH 0/3] Enable Option ROM support in Guest BIOS
Date: Thu, 27 Nov 2008 11:27:00 +0100
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To: Ian Pratt <Ian.Pratt@eu.citrix.com>
Cc: xen-devel@lists.xensource.com, "Shan, Haitao" <haitao.shan@intel.com>, Keir Fraser <Keir.Fraser@eu.citrix.com>, John Levon <levon@movementarian.org>
List-Id: xen-devel@lists.xenproject.org

  Hi,

> Writing even a simple driver for a scsi device is a bit of a pain, so if
> we can't use the real option ROM, it's probably easiest to hack in a
> real simple block read/write and LUN query function into the emulated
> device and then write a trivial option ROM to drive it.
> Anthony Liguori started something similar to this a year or two back,
> but I don't believe it was finished.

It's done, named "extboot", allows booting from scsi and virtio devices
(effectively any qemu block device).  It sits in the kvm tree right now
and will probably submitted to upstream qemu soon.

cheers,
  Gerd