Re: [PATCH] virtio-spec: add field for scsi command size

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On Mon, Jul 01, 2013 at 09:17:13AM +0930, Rusty Russell wrote:
> Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
> 
> > Il 20/06/2013 04:40, Rusty Russell ha scritto:
> >> Paolo Bonzini <pbonzini@xxxxxxxxxx> writes:
> >>> Il 19/06/2013 10:24, Michael S. Tsirkin ha scritto:
> >>>>>> 2) We introduce VIRTIO_NET_F_ANY_LAYOUT and VIRTIO_BLK_F_ANY_LAYOUT
> >>>>>>    specifically for net and block (note the new names).
> >>>
> >>> So why not a transport feature?  Is it just because the SCSI commands
> >>> for virtio-blk also require a config space field?  Sorry if I missed
> >>> this upthread.
> >> 
> >> Mainly because I'm not sure that *all* devices are now safe.  Are they?
> >
> > virtio-scsi's implementation in QEMU is not safe (been delaying that for
> > too long, sorry), but the spec is safe.
> 
> Then if we added a transport feature, we couldn't use it :(
> 
> So I think it needs to be a per-device feature bit.
> 
> Cheers,
> Rusty.

Yea.
Could you push the updated spec so I can send the updated patch?
Would be nice to have the virtio-net optimization in 3.11.
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