aux_config
wrmsrq(MSR_IA32_RTIT_CTL, event->hw.aux_config);
u64 ctl = event->hw.aux_config;
WRITE_ONCE(event->hw.aux_config, ctl);
if (!event->hw.aux_config) {
event->hw.aux_config = reg;
u64 ctl = READ_ONCE(event->hw.aux_config);
WRITE_ONCE(event->hw.aux_config, ctl);
union aux_config cfg);
u64 aux_config;