XEN_NR_IPIS 12 arch/arm/include/asm/xen/events.h XEN_NR_IPIS, XEN_NR_IPIS 12 arch/arm64/include/asm/xen/events.h XEN_NR_IPIS, XEN_NR_IPIS 15 arch/x86/include/asm/xen/events.h XEN_NR_IPIS,