FLAT_RING3_DS64    19 arch/x86/include/asm/xen/interface_64.h #define FLAT_KERNEL_DS64 FLAT_RING3_DS64
FLAT_RING3_DS64    29 arch/x86/include/asm/xen/interface_64.h #define FLAT_USER_DS64 FLAT_RING3_DS64