iommu/vt-d: Delegate the identity domain to upper layer
This allows the iommu generic layer to allocate an identity domain and attach it to a device. Hence, the identity domain is delegated to upper layer. As a side effect, iommu_identity_mapping can't be used to check the existence of identity domains any more. Signed-off-by: NJames Sewart <jamessewart@arista.com> Signed-off-by: NLu Baolu <baolu.lu@linux.intel.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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