On 2020-11-25 1:57 p.m., Christian König wrote:
Well thinking more about this, it seems to be a another really good
argument why mapping pages from DMA-bufs into application address space
directly is a very bad idea :)
Apologies for going off on a tangent here...
Since allowing userspace mmap with dma-buf fds seems to be a trap in
general[0], I wonder if there's any way we could stop supporting that?
[0] E.g. mutter had to disable handing out dma-bufs for screen capture
by default with non-i915 for now, because in particular with discrete
GPUs, direct CPU reads can be unusably slow (think single-digit frames
per second), and of course there's other userspace which goes "ooh,
dma-buf, let's map and read!".
--
Earthling Michel Dänzer | https://redhat.com
Libre software enthusiast | Mesa and X developer
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