KVM: arm64: Don't skip cache maintenance for read-only memslots
If a guest performs cache maintenance on a read-only memslot, we should inform userspace rather than skip the instruction altogether. Signed-off-by:Will Deacon <will@kernel.org> Signed-off-by:
Marc Zyngier <maz@kernel.org> Cc: Marc Zyngier <maz@kernel.org> Cc: Quentin Perret <qperret@google.com> Link: https://lore.kernel.org/r/20200729102821.23392-4-will@kernel.org
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