xen_send_IPI_one
xen_send_IPI_one(cpu, XEN_RESCHEDULE_VECTOR);
xen_send_IPI_one(cpu, vector);
xen_send_IPI_one(smp_processor_id(), xen_vector);
xen_send_IPI_one(cpu, xen_vector);
xen_send_IPI_one(cpu, XEN_SPIN_UNLOCK_VECTOR);
void xen_send_IPI_one(unsigned int cpu, enum ipi_vector vector);