kvm_arm_pmu_get_max_counters
kvm_arm_set_nr_counters(kvm, kvm_arm_pmu_get_max_counters(kvm));
if (n > kvm_arm_pmu_get_max_counters(kvm))
new_n <= kvm_arm_pmu_get_max_counters(kvm))
u8 kvm_arm_pmu_get_max_counters(struct kvm *kvm);