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KVM: arm64: Refactor filtering of ID registers
Our current ID register filtering is starting to be a mess of if()
statements, and isn't going to get any saner.
Let's turn it into a switch(), which has a chance of being more
readable, and introduce a FEATURE() macro that allows easy generation
of feature masks.
No functionnal change intended.
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Alexandru Elisei <alexandru.elisei@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>