fn check_for_kvm_in_txcp_bug()

in reverie-ptrace/src/validation.rs [432:455]

• 21 lines of code
• 4 McCabe index (conditional complexity)

fn check_for_kvm_in_txcp_bug() -> Result<(), PmuValidationError> {
    let mut count: i64 = 0;
    let mut attr = ticks_attr(false);
    attr.config |= IN_TXCP;
    attr.__bindgen_anon_1.sample_period = 0;
    let mut disabled_txcp = false;
    let fd = start_counter(0, -1, &mut attr, Some(&mut disabled_txcp))?;

    let mut arg = 0_u64;

    if !disabled_txcp {
        ioctl(&fd, perf::perf_event_ioctls_DISABLE.into(), &mut arg)?;
        ioctl(&fd, perf::perf_event_ioctls_ENABLE.into(), &mut arg)?;
        do_branches(NUM_BRANCHES);
        count = read_counter(&fd)?;
    }

    let supports_txcp = count > 0;
    if supports_txcp && count < NUM_BRANCHES as i64 {
        Err(PmuValidationError::IntelKvmInTxcpBugDetected)
    } else {
        Ok(())
    }
}