Re: [Qemu-devel] [PATCH v7 2/4] vfio: VFIO driver for mediated devices

[Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>]

* Jike Song <jike.song@intel.com> [2016-09-13 10:35:11 +0800]:

> On 09/08/2016 10:45 AM, Jike Song wrote:
> > On 08/25/2016 05:22 PM, Dong Jia wrote:
> >> On Thu, 25 Aug 2016 09:23:53 +0530
> >> Kirti Wankhede <kwankhede@nvidia.com> wrote:
> >>
> >> [...]
> >>
> >> Dear Kirti,
> >>
> >> I just rebased my vfio-ccw patches to this series.
> >> With a little fix, which was pointed it out in my reply to the #3
> >> patch, it works fine.
> >>
> > 
> > Hi Jia,
> > 
> > Sorry I didn't follow a lot in previous discussion, but since
> > vfio-mdev in v7 patchset is at least PCI-agnostic, would you share
> > with us why you still need a vfio-ccw?
> 
> Kind ping :)
> 
> 
> Hi Dong Jia,
> 
> Since Kirti has confirmed that in v7 it is designed to have only one
> vfio-mdev driver for all mdev devices, would you please tell us the
> reason of your vfio-ccw? It could possibly be an architectural gap and
> the earlier we discuss it the better :)

Hi Jike,

Sorry for the late response.

I think you may mix up vfio-ccw with vfio-mccw, which is in the same
level with vfio-mpci in v6 (or vfio-mdev in v7). :>

The term of vfio-ccw is in the same semantic level with vfio-pci. You
can understand vfio-ccw as the parent device driver in the ccw case.

As you mentioned above, v7 provides an universal mdev driver (vfio-mdev)
for the mediated devices. So I don't need to provide a vfio-mccw (a
vendor specific mediated device driver) anymore, but I'd still need my
vfio-ccw (the parent device driver).

> 
> --
> Thanks,
> Jike
> 

...snip...

-- 
Dong Jia