[PATCH v1 2/2] arm64: smccc: Support SMCCC v1.3 SVE register saving hint

[Mark Brown]

On Tue, May 18, 2021 at 01:14:30PM +0100, Marc Zyngier wrote:
> Mark Brown <broonie at kernel.org> wrote:

> > I do see some ifdefery with __KVM_NVHE_HYPERVISOR__ elsewhere which
> > could be used to take care of that particular case either by
> > providing a __hyp mapping or just not trying to set the flag there
> > (the latter seems safer) but I'm guessing there's others.  Do we
> > have a reliable way of identifying such contexts?

> __KVM_NVHE_HYPERVISOR__ usually is a good indication that we're
> compiling for the nVHE EL2 object. I guess that skipping the
> optimisation would be good enough for KVM, until we decide to provide
> a nVHE-specific helper that uses the private per-cpu information.

Yes, I think skipping it for now is going to be safest and it's
certainly easiest.  I didn't *spot* any other affected cases, but eqally
I didn't spot this one first time around.
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