> >We could also do it the other way around:  Instead of having the kernel 
> >returning
> >the plane description userspace could pass it in, and the kernel throws 
> >-EINVAL in
> >case it doesn't match due to things having changed meanwhile.
> Or just return a dmabuf  based on the current plane ?

If gvt is able to hand out dma-bufs for inactive planes, then yes, we
can do this.  Have one ioctl where we pass in the plane id, get back a
plane description struct, and another where we pass in the plane
description struct and get back a dma-buf fd.


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