kvm_exit_reason
key->key = perf_sample__intval(sample, kvm_exit_reason(EM_AARCH64));
key->key = perf_sample__intval(sample, kvm_exit_reason(EM_RISCV)) & ~CAUSE_IRQ_FLAG(xlen);
key->key = perf_sample__intval(sample, kvm_exit_reason(e_machine));
const char *kvm_exit_reason(uint16_t e_machine);