CPU_FFS
vcpu = CPU_FFS(&mask) - 1;
vcpu = CPU_FFS(&mask) - 1;
cur_vcpu = CPU_FFS(&vcpus_active) - 1;
while ((i = CPU_FFS(&dmask)) != 0) {
while ((vcpuid = CPU_FFS(&dmask)) != 0) {
while ((vcpuid = CPU_FFS(&amask)) != 0) {
while ((cpu = CPU_FFS(&dmask)) != 0) {