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Li, Zhen-Hua committed 7cef33471a3
iommu/vt-d: DMAR reporting table needs at least one DRHD In intel vt-d spec , chapter 8.1 , DMA Remapping Reporting Structure. In the end of the table, it says: Remapping Structures[] - A list of structures. The list will contain one or more DMA Remapping Hardware Unit Definition (DRHD) structures, and zero or more Reserved Memory Region Reporting (RMRR) and Root Port ATS Capability Reporting (ATSR) structures. These structures are described below. So, there should be at least one DRHD structure in DMA Remapping reporting table. If there is no DRHD found, a warning is necessary. Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com> Signed-off-by: Joerg Roedel <joro@8bytes.org>