Thanks Min for the reference of the firmware design guide.<br /><br />If VMM is expected to set it then issue I mentioned with CoreInitializeMemoryServices can be ignored.<br /><br />Though its mentioned in the design guide, I was confused by the current implementation of TDX Qemu as per:<br /><a href="https://github.com/intel/qemu-tdx/blob/tdx/hw/i386/tdvf-hob.c#L169" target="_blank" rel="noopener">https://github.com/intel/qemu-tdx/blob/tdx/hw/i386/tdvf-hob.c#L169</a><br /><a href="https://github.com/intel/qemu-tdx/blob/852a069e739a6ffae4f9dec17607a74690b0e4af/hw/i386/tdvf-hob.h#L15" target="_blank" rel="noopener">https://github.com/intel/qemu-tdx/blob/852a069e739a6ffae4f9dec17607a74690b0e4af/hw/i386/tdvf-hob.h#L15</a>&nbsp;&nbsp;<br /><br />and config B patches:<br /><a href="https://github.com/mxu9/edk2/commit/c5d5786290b2455c5a0a7e3515cf04ec2218d8a4#diff-7cb0d3ac758c9b92166d03049917116ca4a5cb012db99deb491f63c5c5562e0aR124" target="_blank" rel="noopener">https://github.com/mxu9/edk2/commit/c5d5786290b2455c5a0a7e3515cf04ec2218d8a4#diff-7cb0d3ac758c9b92166d03049917116ca4a5cb012db99deb491f63c5c5562e0aR124</a><br /><br />It's possible that I have incomplete view of Qemu implementation or Config B patches.<br /><br />Regards,<br />Vishal