IRQ thread timeouts and affinity

[Jon Hunter]

On 10/10/2025 15:18, Marc Zyngier wrote:

...

> CPU hotplug is the main area of concern, and I'm pretty sure it breaks
> this distribution mechanism (or the other way around). Another thing
> is that if firmware isn't aware that 1:N interrupts can (or should)
> wake-up a CPU from sleep, bad things will happen. Given that nobody
> uses 1:N, you can bet that any bit of privileged SW (TF-A,
> hypervisors) is likely to be buggy (I've already spotted bugs in KVM
> around this).

Thierry, do we ever hotplug CPUs on this device? If not, I am wondering 
if something like this, for now, could only be enabled for devices that 
don't hotplug CPUs. Maybe tied to the kernel config (ie. 
CONFIG_HOTPLUG_CPU)? Just a thought ...

Jon

-- 
nvpublic