Re: [Qemu-devel] [PATCH v2 1/2] virtio: Add function to check whether backend supports VIRTIO_1

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Sep 12, 2016 at 06:42:46PM +0200, Maxime Coquelin wrote:
> 
> 
> On 09/12/2016 02:28 PM, Cornelia Huck wrote:
> > On Fri,  9 Sep 2016 15:10:06 +0200
> > Maxime Coquelin <maxime.coquelin@redhat.com> wrote:
> > 
> > > This patch adds virtio_test_backend_virtio_1() function to
> > > check whether backend supports VIRTIO_F_VERSION_1 before the
> > > negociation takes place.
> > 
> > s/negociation/negotiation/
> > 
> > > 
> > > Cc: Cornelia Huck <cornelia.huck@de.ibm.com>
> > > Cc: Marcel Apfelbaum <marcel@redhat.com>
> > > Cc: Michael S. Tsirkin <mst@redhat.com>
> > > Cc: qemu-stable@nongnu.org
> > > Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> > > ---
> > >  hw/virtio/virtio.c         | 13 +++++++++++++
> > >  include/hw/virtio/virtio.h |  1 +
> > >  2 files changed, 14 insertions(+)
> > > 
> > > diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
> > > index 74c085c..8b30b69 100644
> > > --- a/hw/virtio/virtio.c
> > > +++ b/hw/virtio/virtio.c
> > > @@ -1481,6 +1481,19 @@ void virtio_vmstate_save(QEMUFile *f, void *opaque, size_t size)
> > >      virtio_save(VIRTIO_DEVICE(opaque), f);
> > >  }
> > > 
> > > +bool virtio_test_backend_virtio_1(VirtIODevice *vdev, Error **errp)
> > > +{
> > > +    VirtioDeviceClass *k = VIRTIO_DEVICE_GET_CLASS(vdev);
> > > +    uint64_t feature;
> > 
> > As others had requested, I'd prefer setting this to 0 as well.
> > 
> > With that changed:
> > 
> > Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
> Thanks Cornelia,
> Note that if everyone agree to have patch adding pre_plugged,
> this series will not be needed anymore.
> 
> Regards,
> Maxime

Yes - that one needs testing for ccw and mmio.

-- 
MST