Re: [qemu-web PATCH v2] Add virtio-blk and virtio-scsi configuration post

[Thomas Huth]

On 14/01/2021 17.05, Stefan Hajnoczi wrote:
> On Wed, Jan 06, 2021 at 03:04:20PM +0100, Thomas Huth wrote:
> > On 05/01/2021 11.49, Stefan Hajnoczi wrote:
[...]
> > > +Applications that send SCSI commands are better served by the virtio-scsi
> > > +device, which has full SCSI support. SCSI passthrough was removed from the
> > > +Linux virtio-blk driver in v5.6 in favor of using virtio-scsi.
> >
> > Since "passthrough" sounds like a passthrough of real hardware devices, I'd
> > maybe rather say something like: The original virtio-blk devices also
> > included the possibility to handle SCSI commands, but this features was
> > removed from the Linux driver in v5.6 in favor of using virtio-scsi (and is
> > also not available for modern virtio-1.0 devices anymore).
>
> Guest SCSI commands were passed through to the physical LUN but what you
> described sounds more like emulating SCSI commands, which is not what
> the feature did.

Ok, I likely just understood that feature in the wrong way. Looking at the 
virtio spec, it just talks about the possibility to send SCSI commands to 
the virtio-blk device, but looking at the implementation in QEMU, it seems 
more like the way you described, so never mind my comment.

 Thomas