Re: [RFC v2 7/9] virito-pci: implement queue_enabled method

[Cindy Lu <lulu@redhat.com>]

On Sat, May 9, 2020 at 8:02 PM Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> Typo "virtio-pci" in patch subject.
>
Thanks Philippe, I will fix this
> On 5/8/20 6:32 PM, 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>
> > ---
> >   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 c6b47a9c73..4aaf5d953e 100644
> > --- a/hw/virtio/virtio-pci.c
> > +++ b/hw/virtio/virtio-pci.c
> > @@ -1103,6 +1103,18 @@ 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;
> > +}
> > +
> >   static int virtio_pci_add_mem_cap(VirtIOPCIProxy *proxy,
> >                                      struct virtio_pci_cap *cap)
> >   {
> > @@ -2053,6 +2065,7 @@ static void virtio_pci_bus_class_init(ObjectClass *klass, void *data)
> >       k->ioeventfd_enabled = virtio_pci_ioeventfd_enabled;
> >       k->ioeventfd_assign = virtio_pci_ioeventfd_assign;
> >       k->get_dma_as = virtio_pci_get_dma_as;
> > +    k->queue_enabled = virtio_pci_queue_enabled;
> >   }
> >
> >   static const TypeInfo virtio_pci_bus_info = {
> >
>