On 08/18/2010 11:16 PM, 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...
In my opinion add SCSI support to seabios would be a choice.
Alex
