Function xenpv_probe_cpus

freebsd/x86/xen/pvcpu_enum.c:151–165

* Test each possible vCPU in order to find the number of vCPUs */

 * Test each possible vCPU in order to find the number of vCPUs
 */
static int
xenpv_probe_cpus(void)
{
#ifdef SMP
	int i, ret;

	for (i = 0; i < MAXCPU && (i * 2) < MAX_APIC_ID; i++) {
		ret = HYPERVISOR_vcpu_op(VCPUOP_is_up, i, NULL);
		mp_ncpus = min(mp_ncpus + 1, MAXCPU);
	}
	mp_maxid = mp_ncpus - 1;
	max_apic_id = mp_ncpus * 2;
#endif
	return (0);
}

/*
 * Initialize the vCPU id of the BSP