msr_counter_arch_info
static struct msr_counter_arch_info msr_counter_arch_infos[] = {
int add_msr_perf_counter(int cpu, struct msr_counter_info_t *cci, const struct msr_counter_arch_info *cai)
struct msr_counter_arch_info *cai = &msr_counter_arch_infos[cidx];