On Sat, Oct 01, 2016 at 08:57:05AM +0200, Jan Kiszka wrote:
> I was actually looking for and reading something else when I stumbled
> over "hypercall" in that comment: If AArch64 has a strict need for
> *HVC* based PSCI. 

Yes, in some cases. On platforms without the security extensions, HVC
must be used, as SMC is undefined and cannot be trapped at any higher
exception level.

Given this, I would expect software at EL2/Hyp to only handle HVC from
lower exception levels, as this consistently works even when SMC is
undefined.

Does that help at all?

Thanks,
Mark.

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