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This patch series, which is still WIP but at the point where I would like to request initial comments, adds support for fast IPIs. It also fixes minor bugs in the AIC driver and enhances it to handle multi-CPU affinities properly.
This means all the features of the Corellium driver are now included.
The AIC driver is split into two drivers, one for IRQs, which go through the AIC, and one for FIQs, which don't, never have, and shouldn't be treated as related to IRQs at all.
The funneling of vIPIs into IPIs has moved to arch/arm64/kernel, since both drivers use it and they're at least nominally independent now.
(As an aside without too much relevance, I have some old patches to build Linux without ever clearing the I flag in DAIF, so it can run without knowing or caring about the IRQ controller. This is useful in at least two situations).