[PATCH v1 1/2] drm/i915/gvt: reorder the shadow ppgtt update process by adding entry first

[Zhenyu Wang]

On 2017.05.04 17:35:09 +0800, Tina Zhang wrote:
> Guest i915 driver may update the ppgtt table just before this workload
> is going to be submitted to the hardware by device model. This case
> wasn't handled well by device model before, due to the small time
> window between removing old ppgtt entry and adding the new one. Errors
> occur when the workload is executed by hardware during that small time
> window. This patch is to remove this time window by adding the new ppgtt
> entry first and then remove the old one.
>

Although the fix logic seems sane, but could you elaborate the race case?

-- 
Open Source Technology Center, Intel ltd.

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