iommu/vt-d: Detect pre enabled translation
Add code to detect whether translation is already enabled in the IOMMU. Save this state in a flags field added to struct intel_iommu. Tested-by: NZhenHua Li <zhen-hual@hp.com> Tested-by: NBaoquan He <bhe@redhat.com> Signed-off-by: NJoerg Roedel <jroedel@suse.de>
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