iommu/vt-d: Add set domain DOMAIN_ATTR_NESTING attr
This adds the Intel VT-d specific callback of setting DOMAIN_ATTR_NESTING domain attribution. It is necessary to let the VT-d driver know that the domain represents a virtual machine which requires the IOMMU hardware to support nested translation mode. Return success if the IOMMU hardware suports nested mode, otherwise failure. Signed-off-by: Yi Sun <yi.y.sun@linux.intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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