Re: [RFC v3 4/8] virtio-pci: implement queue_enabled method

[Laurent Vivier]

On 29/05/2020 16:06, Cindy Lu wrote:
> From: Jason Wang <jasowang@redhat.com>
> 
> With version 1, we can detect whether a queue is enabled via
> queue_enabled.
> 
> Signed-off-by: Jason Wang <jasowang@redhat.com>

Add your S-o-b.

> ---
>  hw/virtio/virtio-pci.c | 13 +++++++++++++
>  1 file changed, 13 insertions(+)
> 
> diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
> index 4cb784389c..2c82ed5246 100644
> --- a/hw/virtio/virtio-pci.c
> +++ b/hw/virtio/virtio-pci.c
> @@ -1107,6 +1107,18 @@ static AddressSpace *virtio_pci_get_dma_as(DeviceState 
> *d)
>      return pci_get_address_space(dev);
>  }
>  
> +static bool virtio_pci_queue_enabled(DeviceState *d, int n)
> +{
> +    VirtIOPCIProxy *proxy = VIRTIO_PCI(d);
> +    VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> +
> +    if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) {
> +        return proxy->vqs[vdev->queue_sel].enabled;
> +    }
> +
> +    return virtio_queue_get_desc_addr(vdev, n) != 0;

I think it would be clearer/cleaner to use here:

  return virtio_queue_enabled(vdev, n);

Thanks,
Laurent