Re: [RFC PATCH 12/16] KVM: arm64/sve: Context switch the SVE registers

Andrew Jones
2018-07-25T13:57:37Z

On Wed, Jul 25, 2018 at 12:50:45PM +0100, Dave Martin wrote:
> > > + if (system_supports_sve() && guest_has_sve)
>
> As elsewhere, the system_supports_sve() check uses a static key and
> should be very cheap (or free in a CONFIG_ARM64_SVE=n kernel).
>

Yup, I'm clear on that now. Thanks again for explaining. It might
be nice for a small helper function in this case in order to avoid
the 'system_supports_sve() &&' everywhere and the chance that the
order of the checks gets swapped during some code refactoring someday.

Thanks,
drew