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

[Rusty Russell <rusty@rustcorp.com.au>]

"Michael S. Tsirkin" <mst@redhat.com> writes:
> On Thu, Mar 14, 2013 at 01:10:20PM +0200, Michael S. Tsirkin wrote:
>> Add field for guest to specify command size for virtio-blk.
>> 
>> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
>
> There's one concern here: are we going to add a
> feature flag for flexible layout? If yes this feature
> could thinkably just reuse it.
>
> It allows a nice optimization in virtio net that is very easy
> with latest qemu.
>
> Rusty, what is our plan wrt this?  Are you fine with a per-device
> feature bit?  Or do we need a transport feature bit (there's the small
> issue that we almost run out of them for virtio-pci, do we use the last
> one?).

I'd really like to tie it to the virtio PCI config work, but I need
cycles to complete that....

> As an aside, the new virtio pci config proposal seems to be stuck too,
> are you looking into it or want me to?

That would be good.  If I re-spin the kernel side, will you be able to
look at the QEMU parts?

I can weave this in between my vhost/vringh work and other commitments,
I hope.

Thanks,
Rusty.