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

[Amit Shah <amit.shah@redhat.com>]

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