Re: [PATCH 2/2] irqchip: Add Lightning Mountain irqchip support

[Thomas Gleixner <tglx@kernel.org>]

On Mon, Mar 23 2026 at 13:14, Florian Eckert wrote:
>>> +	domain = irq_domain_create_hierarchy(x86_vector_domain, 0,
>> 
>> So this is hardwired to the vector domain and does not allow the
>> interrupts to be remapped? Those SoCs have VT-x which implies interrupt
>> remapping support. But what do I know about the infinite wisdom of
>> hardware designers.
>> 
>> TBH, if they decided to hardwire it to the vector domain, then they are
>> begging for a cluebat treatment.
>
> Unfortunately, I don’t have a detailed hardware description for this
> IP block. All I have from the Maxlinear is this driver [1] from
> their SDK.

Sigh.

>> #2 NMI routing
>> 
>>    There has been attempts to implement that before in a clean way. The
>>    patch set dried out, but the underlying changes for NMI support are
>>    still valid and Ricardo (CC'ed) is working on them again, IIRC. See:
>> 
>> https://lore.kernel.org/lkml/20230301234753.28582-1-ricardo.neri-calderon@linux.intel.com/
>
> The v7 is already about two years old – let’s see if there’s anything
> else coming.
>
> All in all, thank you for taking the time to look at this. I’ll go back
> to the drawing board and have another closer look at it.

I'd start with the non-NMI part and by that time you got that going,
Ricardo might have an updated version ready.

Thanks,

        tglx