[Intel-gfx] [PATCH v9 5/7] vfio: Define vfio based dma-buf operations

[Gerd Hoffmann]

  Hi,

> > Does gvt track the live cycle of all dma-bufs it has handed out?
> 
> The V9 implementation does track the dma-bufs' live cycle. The
> original idea was that leaving the dma-bufs' live cycle management to
> user mode.

That is still the case, user space decides which dma-bufs it'll go keep
cached.  But kernel space can see what user space is doing, so there is
no need to explicitly tell the kernel whenever a cached dma-buf exists
or not.

cheers,
  Gerd