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The trigger to actually save the boot script is the installation of EFI_DXE_SMM_READY_TO_LOCK_PROTOCOL, to be performed by any DXE driver. Installation of the protocol also locks down SMM (as its name indicates) and (in theory) prevents further LockBox access. We cannot install this protocol before BdsLibBootViaBootOption() is called (eg. in OVMF's PlatformBdsPolicyBehavior()), because BdsLibBootViaBootOption() calls EFI_ACPI_S3_SAVE_PROTOCOL.S3Save(), which needs LockBox access. We also can't install the protocol after BdsLibBootViaBootOption() returns, simply because control is never returned to us. Therefore modify our EFI_ACPI_S3_SAVE_PROTOCOL implementation so that the boot script is prepared and installed internally to S3Save(). (The boot script must contain at least one opcode, otherwise S3BootScriptLib runs into an assertion failure. We add a harmless (no-op) "information" opcode.) Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Laszlo Ersek <lersek@redhat.com> Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15305 6f19259b-4bc3-4df7-8a09-765794883524