在 2021/4/8 下午5:38, Cindy Lu 写道:
> add configure interrupt support for virtio-mmio bus. This
> interrupt will working while backend is vhost-vdpa
So this is actually the guest notifier of config interrupt for virtio-mmio.
Thanks
>
> Signed-off-by: Cindy Lu <lulu@redhat.com>
> ---
> hw/virtio/virtio-mmio.c | 26 ++++++++++++++++++++++++++
> 1 file changed, 26 insertions(+)
>
> diff --git a/hw/virtio/virtio-mmio.c b/hw/virtio/virtio-mmio.c
> index 1aa1aaeca4..64b347421b 100644
> --- a/hw/virtio/virtio-mmio.c
> +++ b/hw/virtio/virtio-mmio.c
> @@ -632,7 +632,26 @@ static int virtio_mmio_set_guest_notifier(DeviceState *d, int n, bool assign,
>
> return 0;
> }
> +static int virtio_mmio_set_config_notifier(DeviceState *d, bool assign)
> +{
> + VirtIOMMIOProxy *proxy = VIRTIO_MMIO(d);
> + VirtIODevice *vdev = virtio_bus_get_device(&proxy->bus);
> + VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
>
> + EventNotifier *notifier = virtio_get_config_notifier(vdev);
> + int r = 0;
> + if (assign) {
> + r = event_notifier_init(notifier, 0);
> + virtio_set_config_notifier_fd_handler(vdev, true, false);
> + } else {
> + virtio_set_config_notifier_fd_handler(vdev, false, false);
> + event_notifier_cleanup(notifier);
> + }
> + if (vdc->guest_notifier_mask && vdev->use_guest_notifier_mask) {
> + vdc->guest_notifier_mask(vdev, 0, !assign, VIRTIO_CONFIG_VECTOR);
> + }
> + return r;
> +}
> static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
> bool assign)
> {
> @@ -654,8 +673,15 @@ static int virtio_mmio_set_guest_notifiers(DeviceState *d, int nvqs,
> goto assign_error;
> }
> }
> + r = virtio_mmio_set_config_notifier(d, assign);
> + if (r < 0) {
> + goto config_assign_error;
> + }
>
> return 0;
> +config_assign_error:
> + assert(assign);
> + r = virtio_mmio_set_config_notifier(d, false);
>
> assign_error:
> /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */