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Our asserts allow for the PDEs to be allocated concurrently, but we did not account for the aliasing-ppgtt to be preallocated on top. Testcase: igt/gem_ppgtt #bsw Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Acked-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20191207221453.2802627-1-chris@chris-wilson.co.uk