iommu/vt-d: Introduce helper functions to make code symmetric for readability
Introduce domain_attach_iommu()/domain_detach_iommu() and refine iommu_attach_domain()/iommu_detach_domain() to make code symmetric and improve readability. Signed-off-by: NJiang Liu <jiang.liu@linux.intel.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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