Re: [Qemu-devel] [sneak preview] major scsi overhaul

[Gerd Hoffmann]

On 11/27/09 12:08, Gerd Hoffmann wrote:
> On 11/26/09 16:50, Hannes Reinecke wrote:
> > So indeed, this approach would only work if we signal some sense code
> > back to the host.
> > I, OTOH, don't have any qualms with returning HARDWARE_ERROR,
> > 0x26/0x08(TOO MANY SEGMENT DESCRIPTORS) resp 0x26h/0x0B (INLINE DATA
> > LENGTH EXCEEDED).
> > Feels only fair to notify the guest it has done something wrong.
>
> Also set the info field which linux uses to figure how many sectors it
> actually got.

Hmm.  Well.  Seems to work out at least for linux, i.e. it figures it 
got a bunch of sectors and tries to continue.  Linux logs an I/O error. 
 Also I didn't try other guests (yet).

Using that as a way to limit scsi-disk request sizes probably isn't a 
good idea.  For scsi-generic that would be a improvement over the 
current situation though.

cheers,
  Gerd