Intel-IOMMU

[Saptarshi Sen]

I am trying to understand the intel-iommu.

a) I find mention of three address types. Untranslated Requests,
Translation Requests and Translated Requests.

Translated Requests mean translation of host virtual to host physical.

But I am unclear about the other two requests. One of them should be GVA to
HPA.

The VT-d spec does not clearly mention the difference.

b) Secondly, there are two levels of Address Translations. I am working in
a non VM environment but still using IOMMU through VFIO. I was curious to
know whether we really need two levels of translations as in my case.

Thanks
Saptarshi
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