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[Xen-devel] question about gmfn_to_mfn()

I read the code of balloon part, I am confused about the meaning and function of " mfn = gmfn_to_mfn(d, gmfn);" what is gmfn and and what is mfn? and" #define gmfn_to_mfn(_d, gpfn) mfn_x(sh_gfn_to_mfn(_d, gpfn))"
it seems that  gmfn and gpfn  is the same  or  what is the trick in it ?

I am confused about it

could you help me
Thanks in advance

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