Re: [Xen-devel] [RFC] Virtual disk configuration, PV vs. emulated, backward compatibility etc

[Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>]

On Thu, 29 Jul 2010 09:37:22 -0700
Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

>   On 07/29/2010 09:34 AM, Ian Jackson wrote:
> > Jeremy Fitzhardinge writes ("Re: [Xen-devel] [RFC] Virtual disk 
> > configuration, PV vs. emulated, backward compatibility etc"):
> >> I wonder if blkfront could register itself with the scsi subsystem
> >> rather than directly as a block device?
> > I bet that would mean it would have to deal with SCSI command blocks
> > and stuff, so I doubt it.
> 
> Well, random ide/ata devices are now part of scsi via libata, and they 
> presumably can not deal with raw scsi commands.

ATAPI device speak SCSI (or a sort of Pidgin SCSI anyway), libata
translates SCSI<->ATA for disks, so you can in the Linux world throw
arbitary *valid* SCSI at them and you should get valid and correct
behaviour for a SCSI disk. If not its a bug.

Alan

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