Hi Will, > On Wed, Apr 22, 2026 at 02:32:23PM +0100, Yeoreum Yun wrote: > > 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/[email protected]/ > > I can't say that I'm a huge fan of that :/ > > The notifier will literally fire once, for a single listener. That's > called a function call.
I revisited Marc’s suggestion about using device links (https://lore.kernel.org/all/[email protected]/) but unless I’m misunderstanding something, I don’t think it would be a viable solution: - https://lore.kernel.org/all/[email protected]/#t Also, calling functions defined by FF-A from KVM would introduce an unnecessary module dependency between the KVM and FF-A drivers. I’ve been trying to find an alternative approach, but I’m not confident about what would be appropriate. If you don’t mind, could you share your thoughts on this? Thanks! -- Sincerely, Yeoreum Yun
