Re: [RFC PATCH 4/4] firmware: arm_ffa: check pkvm initailised when initailise ffa driver

Yeoreum Yun
2026-04-22T13:33:34Z

Hi All,

> > On Tue, Apr 21, 2026 at 07:57:43AM +0100, Yeoreum Yun wrote:
> >
> > [...]
> >
> > >
> > > Also, the FF-A initialization is not driven by a device probe, but rather
> > > happens as part of the bus registration itself,
> > > so it does not fit well with a device_link or probe deferral based approach.
> > >
> > > Instead, perhaps we could go with the idea I mentioned previously:
> > > either introduce a notifier, or create a pseudo ffa_device
> > > once pKVM initialization has completed, and
> > > then let the ffa driver perform the additional initialization from there.
> > >
> > > Am I missing something?
> > >
> >
> > In order to handle/cleanup some ugliness in interrupt management in the
> > FF-A driver, we may introduce DT node eventually. But it will take sometime.
>
> Unfortunately, I think this DT node wouldn't be helpful to solve
> this situation for dependency with the kvm misc device...
>
> IMHO, current situation, the notifier seems to good option. unless
> we make the initcall to recongise this dependency.
>

I think the best approach for now is to introduce a notifier to handle this situation.
If there are no further suggestions, I’ll send a v2 based on:
- https://lore.kernel.org/all/aeS4rAeVQ0yJIPYw@e129823.arm.com/

Thanks!

--
Sincerely,
Yeoreum Yun