Re: [PATCH v7 03/10] x86/cpufeatures: Add the CPUID feature bit for NMI-source reporting

[Xin Li]

On 6/12/2025 2:48 PM, Sohil Mehta wrote:
> NMI-source reporting is introduced to report the sources of NMIs with
> FRED event delivery based on vectors in NMI interrupt messages or the
> local APIC. This enables the kernel to avoid the latency incurred by
> going over the entire NMI handler list and reduces ambiguity about the
> source of an NMI.
>
> Enumerate NMI-source reporting in cpufeatures.h. Also, since NMI-source
> reporting uses the FRED event dispatch framework, make it dependent on
> FRED in the CPUID dependency table. This ensures that NMI-source
> reporting gets disabled when FRED is disabled.
>
> NMI-source reporting is intended as a kernel feature and does not need
> userspace enumeration or configuration. There is no need to expose it to
> userspace through /proc/cpuinfo.
>
> Originally-by: Jacob Pan<jacob.jun.pan@xxxxxxxxxxxxxxx>
> Signed-off-by: Sohil Mehta<sohil.mehta@xxxxxxxxx>

Reviewed-by: Xin Li (Intel) <xin@xxxxxxxxx>