[Intel-gfx] [PATCH] drm/i915/execlists: Disable preemption under GVT

[Chris Wilson]

Quoting Zhenyu Wang (2019-06-24 10:02:31)
> On 2019.06.21 20:13:13 +0100, Chris Wilson wrote:
> > Preempt-to-busy uses a GPU semaphore to enforce an idle-barrier across
> > preemption, but mediated gvt does not fully support semaphores.
> >
> 
> Current looks semaphore is still used from emit_fini_breadcrumb which
> caused gvt error, gvt may support memory based semaphore but not for
> reg based.

Already resent patch to avoid the emission as well, as I guessed that
even using a no-op semaphore might be problematic :)
-Chris