Re: [RFC PATCH v2 1/3] vfio: Use capability chains to handle device specific irq

[kraxel@xxxxxxxxxx]

  Hi,

> > Really need to split for different planes? I'd like a
> > VFIO_IRQ_SUBTYPE_GFX_DISPLAY_EVENT
> > so user space can probe change for all.

> User space can choose to user different handlers according to the
> specific event. For example, user space might not want to handle every
> cursor event due to performance consideration. Besides, it can reduce
> the probe times, as we don't need to probe twice to make sure if both
> cursor plane and primary plane have been updated.

I'd suggest to use the value passed via eventfd for that, i.e. instead
of sending "1" unconditionally send a mask of changed planes.

cheers,
  Gerd