This VTD_INFO_PPI is to provide VTD information in PEI. As such, we can have a generic VTd driver. It is a lightweight version DMAR table, but it does not contain PCI device information. Cc: Star Zeng <star.zeng@intel.com> Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Jiewen Yao <jiewen.yao@intel.com> Reviewed-by: Star Zeng <star.zeng@intel.com>