iommu/vt-d: Use a helper function to skip agaw for SL
An Intel iommu domain uses 5-level page table by default. If the iommu that the domain tries to attach supports less page levels, the top level page tables should be skipped. Add a helper to do this so that it could be used in other places. Signed-off-by: NJacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: NLu Baolu <baolu.lu@linux.intel.com> Reviewed-by: NEric Auger <eric.auger@redhat.com> Reviewed-by: NKevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20200516062101.29541-3-baolu.lu@linux.intel.comSigned-off-by: NJoerg Roedel <jroedel@suse.de>
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