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KVM: arm64: Make AMU sysreg UNDEF if FEAT_AMU is not advertised to the guest
No AMU? No AMU! IF we see an AMU-related trap, let's turn it into an UNDEF! Reviewed-by: Joey Gouly <joey.gouly@arm.com> Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20240214131827.2856277-24-maz@kernel.org Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
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