[Xen-devel] functionality of xc_dom_pfn_to_ptr

[Sandesh <sandesh.ahiremath@xxxxxxxxx>]

hi all,
  I have some confusion about the functionality of xc_dom_pfn_to_ptr.
According to my understanding i think it's used to return an ptr to the
segment base by creating a physical_to_machine address mapping for each
guest. but the part thats confusing me is that in the privcmd.c the MMAP
switch case calls direct_remap_pfn_range which inturn calls 
apply_to_page_range which updates the dom0 page tables!!! why is this
required?? 
        Please correct me if my understanding is wrong.

Thanks,
  Sandesh


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