[Xen-devel] Distinguishing gpfn, gmfn, mfn, and pfn

[Sengul Thomas <thomas.sengul@xxxxxxxxx>]

Hi xen developers,

I'm confused about the actual usage of the four types of frames.
I can find the definition in xen/include/xen/mm.h, but would like
to check my understanding is correct:

1) Is 2-stage MMU-supported (e.g., ARMv7 VE) translation
    auto-translated mode? Then, gpfn == gmfn.

2) Is gmfn --> mfn mapping the p2m table?

3) Paravirtualized x86 guest will have gpfn != gmfn, and it is
    quite hard to imagine. Could you tell me the difference
    between gpfn and gmfn? (for instance, when it is used)


thanks always,
Thomas

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