[RFC PATCH v2 3/3] KVM: arm64: Enable errata based on migration target CPUs

[Oliver Upton]

nitpick: shortlog shouldn't use a KVM prefix if the patch isn't touching
KVM.

On Thu, Oct 24, 2024 at 10:40:12AM +0100, Shameer Kolothum wrote:
> If the Guest has migration target CPUs set, enable all errata
> that are based on target MIDR/REVIDR.
> 
> Also make sure we call the paravirt helper to retrieve migration
> targets if any.
> 
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi at huawei.com>

I don't know if you saw my suggestion on v1 [*], but it'd be great if we
can hide the array of implementations from users of is_midr_in_range()
and friends.

There's other junk keyed off MIDR (e.g. Spectre) that also needs to be
aware of all the implementations where the VM might run. The easiest way
to do that is to stop using a caller-provided MIDR and have
is_midr_in_range() either walk the array of implementations or read
MIDR_EL1.

[*]: https://lore.kernel.org/kvmarm/ZwlbTCwoKQyh3vmF@linux.dev/

-- 
Thanks,
Oliver