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IOAPIC info, specifically ID, is needed to map the IOAPIC to corresponding DMAR. DMAR table in ACPI has a field that has IOAPIC ID, that matches the info provided in MADT. Both (IOAPIC info from MADT and from DMAR) is needed for remapping IOAPIC interrupts. Tracked-On: #2426 Signed-off-by: Sainath Grandhi <sainath.grandhi@intel.com> Acked-by: Anthony Xu <anthony.xu@intel.com>