Re: [Qemu-devel] [PATCHv4 06/12] virtio: add set_status callback

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

On Thu, Mar 04, 2010 at 05:49:37PM +0530, Amit Shah wrote:
> On (Wed) Mar 03 2010 [19:16:13], Michael S. Tsirkin wrote:
> > vhost net backend needs to be notified when
> > frontend status changes. Add a callback,
> > similar to set_features.
> > 
> > Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
> > ---
> >  hw/s390-virtio-bus.c |    2 +-
> >  hw/syborg_virtio.c   |    2 +-
> >  hw/virtio-pci.c      |    5 +++--
> >  hw/virtio.h          |    9 +++++++++
> >  4 files changed, 14 insertions(+), 4 deletions(-)
> > 
> > diff --git a/hw/s390-virtio-bus.c b/hw/s390-virtio-bus.c
> > index fa0a74f..6f93d67 100644
> > --- a/hw/s390-virtio-bus.c
> > +++ b/hw/s390-virtio-bus.c
> > @@ -242,7 +242,7 @@ void s390_virtio_device_update_status(VirtIOS390Device *dev)
> >      VirtIODevice *vdev = dev->vdev;
> >      uint32_t features;
> >  
> > -    vdev->status = ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS);
> > +    virtio_set_status(vdev, ldub_phys(dev->dev_offs + VIRTIO_DEV_OFFS_STATUS));
> >  
> >      /* Update guest supported feature bitmap */
> >  
> > diff --git a/hw/syborg_virtio.c b/hw/syborg_virtio.c
> > index 65239a0..c7b1162 100644
> > --- a/hw/syborg_virtio.c
> > +++ b/hw/syborg_virtio.c
> > @@ -149,7 +149,7 @@ static void syborg_virtio_writel(void *opaque, target_phys_addr_t offset,
> >          virtio_queue_notify(vdev, value);
> >          break;
> >      case SYBORG_VIRTIO_STATUS:
> > -        vdev->status = value & 0xFF;
> > +        virtio_set_status(vdev, value);
> 
> Dropping the '& 0xFF'? Should be OK, but in the next hunk it's retained:
> 
> >          if (vdev->status == 0)
> >              virtio_reset(vdev);
> >          break;
> > diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
> > index bcd40f7..fd9759a 100644
> > --- a/hw/virtio-pci.c
> > +++ b/hw/virtio-pci.c
> > @@ -206,7 +206,7 @@ static void virtio_ioport_write(void *opaque, uint32_t addr, uint32_t val)
> >          virtio_queue_notify(vdev, val);
> >          break;
> >      case VIRTIO_PCI_STATUS:
> > -        vdev->status = val & 0xFF;
> > +        virtio_set_status(vdev, val & 0xFF);
> >          if (vdev->status == 0) {
> >              virtio_reset(proxy->vdev);
> >              msix_unuse_all_vectors(&proxy->pci_dev);
> 
> 		Amit

Yea, maybe both places should go.