[Xen-devel] Allowing several mappings of a frame

[Mohammad Hedayati <hedayati.mo@xxxxxxxxx>]

Xen currently allows granting a single frame to several domains,
several times (to map or copy). Though the feature itself seems
appealing, I wonder if there's a real use case in any ports or PV
aware applications (i.e. a page is mapped or copied by more than 2
domains). Is there?

Except the condition outlined above, PGC_count_mask part of a
page->count_info can be more than 1?

Thanks,
Mohammad

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