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Re: [Qemu-devel] [PATCH - V3] Port codes from qemu-kvm to support bootin

From: Gleb Natapov
Subject: Re: [Qemu-devel] [PATCH - V3] Port codes from qemu-kvm to support booting from SCSI disk image
Date: Wed, 18 Aug 2010 18:37:20 +0300

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 
src/drivers/block/scsi.c so may be it already supports qemu scsi device?


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