Now that we've implemented a generic machine option for configuring various
confidential guest support mechanisms:
1. Update docs/amd-memory-encryption.txt to reference this rather than
the earlier SEV specific option
2. Add a docs/confidential-guest-support.txt to cover the generalities of
the confidential guest support scheme
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Greg Kurz <groug@kaod.org>
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