Re: [Qemu-devel] [PATCH] vhost: Use vbus var instead of VIRTIO_BUS() macro

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

On Wed, Nov 09, 2016 at 02:22:42PM +0100, Paolo Bonzini wrote:
> 
> 
> On 09/11/2016 14:18, Felipe Franciosi wrote:
> > Recent changes on vhost_dev_enable/disable_notifiers() produced a
> > VirtioBusState vbus variable which can be used instead of the
> > VIRTIO_BUS() macro. This commit just makes the code a little bit cleaner
> > and more consistent.
> > 
> > Signed-off-by: Felipe Franciosi <felipe@nutanix.com>
> 
> Michael, what do you think?  Perhaps it's simplest to just squash the
> two patches (v2 of "vhost: Update 'ioeventfd_started' with host
> notifiers" and this one).
> 
> Paolo

I think I'll apply both but why bother squashing?

> > ---
> >  hw/virtio/vhost.c | 14 ++++++--------
> >  1 file changed, 6 insertions(+), 8 deletions(-)
> > 
> > diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> > index 1290963..7d29dad 100644
> > --- a/hw/virtio/vhost.c
> > +++ b/hw/virtio/vhost.c
> > @@ -1198,20 +1198,18 @@ int vhost_dev_enable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
> >  
> >      virtio_device_stop_ioeventfd(vdev);
> >      for (i = 0; i < hdev->nvqs; ++i) {
> > -        r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
> > -                                         true);
> > +        r = virtio_bus_set_host_notifier(vbus, hdev->vq_index + i, true);
> >          if (r < 0) {
> >              error_report("vhost VQ %d notifier binding failed: %d", i, -r);
> >              goto fail_vq;
> >          }
> >      }
> > -    VIRTIO_BUS(qbus)->ioeventfd_started = true;
> > +    vbus->ioeventfd_started = true;
> >  
> >      return 0;
> >  fail_vq:
> >      while (--i >= 0) {
> > -        e = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
> > -                                         false);
> > +        e = virtio_bus_set_host_notifier(vbus, hdev->vq_index + i, false);
> >          if (e < 0) {
> >              error_report("vhost VQ %d notifier cleanup error: %d", i, -r);
> >          }
> > @@ -1230,17 +1228,17 @@ fail:
> >  void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev)
> >  {
> >      BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev)));
> > +    VirtioBusState *vbus = VIRTIO_BUS(qbus);
> >      int i, r;
> >  
> >      for (i = 0; i < hdev->nvqs; ++i) {
> > -        r = virtio_bus_set_host_notifier(VIRTIO_BUS(qbus), hdev->vq_index + i,
> > -                                         false);
> > +        r = virtio_bus_set_host_notifier(vbus, hdev->vq_index + i, false);
> >          if (r < 0) {
> >              error_report("vhost VQ %d notifier cleanup failed: %d", i, -r);
> >          }
> >          assert (r >= 0);
> >      }
> > -    VIRTIO_BUS(qbus)->ioeventfd_started = false;
> > +    vbus->ioeventfd_started = false;
> >      virtio_device_start_ioeventfd(vdev);
> >  }
> >  
> >