Re: [Qemu-devel] boot from scsi/virtio?

[Laurent Vivier <Laurent.Vivier@bull.net>]

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Le vendredi 15 mai 2009 à 10:54 +0200, Gerd Hoffmann a écrit :
> On 05/15/09 10:46, Laurent Vivier wrote:
> > Le vendredi 15 mai 2009 à 10:26 +0200, Gerd Hoffmann a écrit :
> >> Hi folks,
> >>
> >> Is it possible to boot from non-ide disks?  kvm has extboot and the
> >> -drive ...,boot=on syntax to use it.  That isn't in upstream qemu
> >> though.  Is there another way to boot from non-ide disks?  Or is extboot
> >> just not yet merged?  Or are there other plans?
> >
> > I did last year a series of patches to enable virtio boot using gPXE
> > add-on ROM:
> >
> > http://markmail.org/message/qxqvcrzqitpzrsnb
> 
> Didn't got merged it seems.  git tree hasn't a block subdir.  Also 
> rom-o-magic offers virtio-net only.  And it doesn't solve the scsi 
> booting issue, right?

Yes, I didn't finish this work and didn't push it to the git tree.
It introduces block device support into gPXE and a virtio-block driver
using it. To support SCSI we have to write the SCSI driver too...

Attached, an old ROM I found on my disk (not tested recently) ...
(use it with "-driver file=...,if=virtio -option-rom virtio-blk.brom")

You can use it to boot from a CDROM too (but the kernel doesn't have
support for that)

Regards,
Laurent
-- 
------------------ Laurent.Vivier@bull.net  ------------------
"Tout ce qui est impossible reste à accomplir"    Jules Verne
"Things are only impossible until they're not" Jean-Luc Picard

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