__HYPERVISOR_VIRT_START   44 arch/x86/include/asm/xen/interface_32.h #define __HYPERVISOR_VIRT_START 0xF5800000
__HYPERVISOR_VIRT_START   38 arch/x86/include/asm/xen/interface_64.h #define __HYPERVISOR_VIRT_START 0xFFFF800000000000