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To prepare for performing CMOs for guest stage-2 in the fault handlers in pgtable.c, here introduce two cache maintenance callbacks in struct kvm_pgtable_mm_ops. We also adjust the comment alignment for the existing part but make no real content change at all. Reviewed-by: Fuad Tabba <tabba@google.com> Signed-off-by: Yanan Wang <wangyanan55@huawei.com> [maz: fixed up comments and renamed callbacks] Signed-off-by: Marc Zyngier <maz@kernel.org> Link: https://lore.kernel.org/r/20210617105824.31752-2-wangyanan55@huawei.com