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RFC: https://bugzilla.tianocore.org/show_bug.cgi?id=3429 TDVF access MMIO with TDG.VP.VMCALL to invoke VMM provided emulation functions. If the access to MMIO fails, it fall backs to the direct access. BaseIoLibIntrinsic.inf is the IoLib used by other packages. It will not support I/O in Td guest. But some files are shared between BaseIoLibIntrinsic and BaseIoLibIntrinsicSev (IoLib.c is the example). So IoLibInternalTdxNull.c (which holds the null stub of the Td I/O routines) is included in BaseIoLibIntrinsic.inf. BaseIoLibIntrinsic.inf doesn't import TdxLib so that the Pkgs which include BaseIoLibIntrinsic.inf need not include TdxLib. Cc: Michael D Kinney <michael.d.kinney@intel.com> Cc: Liming Gao <gaoliming@byosoft.com.cn> Cc: Zhiguang Liu <zhiguang.liu@intel.com> Cc: Brijesh Singh <brijesh.singh@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: James Bottomley <jejb@linux.ibm.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Liming Gao <gaoliming@byosoft.com.cn> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com> Signed-off-by: Min Xu <min.m.xu@intel.com>