KVM: arm64: Pass level hint to TLBI during stage-2 permission fault

Alex pointed out that we don't pass a level hint to the TLBI instruction
when handling a stage-2 permission fault, even though the walker does
at some point have the level information in its hands.

Rework stage2_update_leaf_attrs() so that it can optionally return the
level of the updated pte to its caller, which can in turn be used to
provide the correct TLBI level hint.

Reported-by: Alexandru Elisei <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
Reviewed-by: Alexandru Elisei <[email protected]>
Reviewed-by: Gavin Shan <[email protected]>
Cc: Marc Zyngier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/[email protected]

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