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[Xen-devel] question about machine-to-physic table and phy-to-machine table

I read the code ,there are machine-to-physic table and physic-to-machine table there are machine address for hardward address ,physic address for guestos's view hardware and virtual address ,is it right?

phy-to-machine table is a mapping for guestos's view hardware to real hardward ,is it right?
I am confused about the meaning and function of  machine-to-physic address

could you help me
Thanks in advnace

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