Is it reasonable for ATS Invalidate Completion to check its RID width and report an fault if it is wider than that supported by the IOMMU mode？

Question

Is it reasonable for ATS Invalidate Completion to check its RID width and report an fault if it is wider than that supported by the IOMMU mode？

Closed this issue 2 months ago · 1 comments

There is no related check in the c_model. And if the fault is reported , will it be useful?

Answer 1 · 2024-05-29T12:20:28.000Z

If an IOMMU receives a invalidation completion where the combination of RID and iTAG does not match an outstanding invalidation then such messages are ignored. An IOMMU cannot receive a RID wider than its maximum supported width as these messages are received over a hardware bus from the root port.