[Xen-devel] c/s 21886 change to DMAR table hiding

["Cihula, Joseph" <joseph.cihula@xxxxxxxxx>]

Keir,

In c/s 21886, you changed the method by which the DMAR ACPI table was hidden 
from dom0.  Why was this change needed?
-    dmar->header.signature[0] = '\0';
+    dmar->header.signature[0] = 'X';
+    dmar->header.checksum -= 'X'-'D';

I ask because tboot was using the original method to unhide/re-hide the table 
during S3 (because the TXT launch on S3 resume requires a valid DMAR table) and 
this has broken S3 w/ TXT.

Joe

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