FOREIGN_FRAME_BIT   27 include/asm-x86/xen/page.h #define FOREIGN_FRAME(m)	((m) | FOREIGN_FRAME_BIT)
FOREIGN_FRAME_BIT   42 include/asm-x86/xen/page.h 	return get_phys_to_machine(pfn) & ~FOREIGN_FRAME_BIT;