On 12/05/17 12:06, Chris Wilson wrote:
On Fri, May 12, 2017 at 06:55:35PM +0100, Chris Wilson wrote:
On Fri, May 12, 2017 at 06:49:09PM +0100, Chris Wilson wrote:
We have always excluded the top-page of the Global GTT to prevent
prefetching past the end of the address space. We have been lax about
applying this restriction to the per-process GTT, but there is no reason
to believe that the hw restriction is any less severe.
Other than empirical, but the note in bspec is still there and who knows
they may start to be strict again in future.
Fwiw, it looks like we can sleep on this again. Jason no longer believes
this to be an immediate issue.
-Chris
It might be true for 32b ppgtt, but anything slightly recent should
already be using 48b.
-Michel
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