Re: [Qemu-devel] [PATCH v6 2/8] virtio-blk: add the virtio-blk device.

[Cornelia Huck <cornelia.huck@de.ibm.com>]

On Tue, 12 Mar 2013 16:22:22 +0100
KONRAD Frédéric <fred.konrad@greensocs.com> wrote:

> On 12/03/2013 16:12, Peter Maydell wrote:
> > On 12 March 2013 15:08, KONRAD Frédéric <fred.konrad@greensocs.com> wrote:
> >> On 12/03/2013 15:42, Peter Maydell wrote:
> >>> Yes, I see your problem there, but DEFINE_VIRTIO_BLK_SCSI_PROPERTY
> >>> and DEFINE_DATA_PLANE_PROPERTIES are just convenience macros, not
> >>> ones that are expected to be used by other code, right? So you can
> >>> define them with commas (and name them something so it's obvious
> >>> they're not intended for wider use as property array elements),
> >>> and then just make sure your public-facing DEFINE_VIRTIO_BLK_PROPERTIES
> >>> doesn't end with a comma. (You can do that by putting the macros
> >>> that expand to maybe-comma-or-not at the front, not the end.)
> >>>
> >>> -- PMM
> >> ok, I can put a comment which say not to use them?
> > And suitable macro names (ie not ones which look like all
> > the other DEFINE_FOO_PROPERTIES ones). Alternatively since the
> > macro's only used once as far as I can see, you could just not
> > bother to abstract it out. The virtio-ccw blk properties still
> > just have inline #ifdefs for the scsi prop for instance.
> >
> > -- PMM
> 
> The macro is used for virtio-blk device and virtio-blk-pci.
> s390x devices don't use the same properties.
> 

Looking at the s390 devices, the difference seems to be the following:

- CHS - missing on virtio-ccw, I'll do a patch.
- config_wce - missing on s390-virtio and virtio-ccw, should probably
  be added.
- x-data-plane - we plan to add this eventually to virtio-ccw, but not
  to s390-virtio. Could that be split out from the generic properties?