On Wed, Aug 18, 2010 at 05:16:56PM +0200, Alexander Graf wrote:
>
> On 18.08.2010, at 17:08, Paul Brook wrote:
>
> >> The qemu-kvm could boot from SCSI disk image by utilizing seabios, this
> >> patch ported codes
> >> from qemu-kvm to let upstream qemu to support booting from SCSI disk image.
> >
> > No. This has nothing to do with SCSI.
> >
> > What it does is add a really cheap and nasty block storage device that
> > aliases
> > one of the other block devices in the system. This is bad. The OS has no
> > way
> > of knowing which devices are aliased, and we really don't want yet another
> > braindead guest visible interface (c.f. recent performance issues where -
> > kernel/fw_cfg were being abused)
> >
> > This has been discussed several times before. The proper solution is to
> > teach
> > the bios how to boot off SCSI devices. IIRC support for virtio devices
> > already
> > exists, implementing support for the SCSI controller shouldn't be that much
> > harder.
>
> Couldn't we just have an option rom for the SCSI controller? The same way the
> VGABIOS is a rewrite of a VGA BIOS for the Cirrus Logic...
>
>
Of course we could, but it should not be extboot, but proper scsi driver. gpxe
has
src/drivers/block/scsi.c so may be it already supports qemu scsi device?
--
Gleb.
