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Add macros to check for 5-level paging and gigabyte page support. Enable 5-level paging for the non-confidential-computing case. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Message-Id: <20240301074402.98625-7-kraxel@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Oliver Steffen <osteffen@redhat.com> Cc: Michael Roth <michael.roth@amd.com> Cc: Erdem Aktas <erdemaktas@google.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Tom Lendacky <thomas.lendacky@amd.com> [lersek@redhat.com: turn the "Cc:" message headers from Gerd's on-list posting into "Cc:" tags in the commit message, in order to pacify "PatchCheck.py"]