Xen devel - Apr 2011 - xc_map_foreign_range() to Map Dom U kernel

Hi All,
           I am currently trying to map memory from Dom U to Domain 0 using the
xc_map_foreign_range() function. I am trying to understand some of the arguments
in xc_map_foreign_range() like int size, int prot and unsigned long mfn.
 I am guessing that the value of mfn indicates the page in Dom U that I wish to
start mapping from. The size indicates the range of pages as a multiple of Page
Size and prot indicates Read/Write access. If this is correct,  then how do I
get the values for these 3 arguments.  Say for instance, If I wanted to map the
kernel running in the Dom U or even a specific process running in DOM U.?
Can someone please shed some light on it?
Thanks a lot.

Regards,
Jeet

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