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OvmfPkg: create a SEV secret area in the AmdSev memfd

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SEV needs an area to place an injected secret where OVMF can find it
and pass it up as a ConfigurationTable.  This patch implements the
area itself as an addition to the SEV enhanced reset vector table using
an additional guid (4c2eb361-7d9b-4cc3-8081-127c90d3d294).

Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3077
Signed-off-by: James Bottomley <jejb@linux.ibm.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201130202819.3910-5-jejb@linux.ibm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
[lersek@redhat.com: fix typo in "ResetVectorVtf0.asm" comments]
This commit is contained in:
James Bottomley
2020-11-30 12:28:17 -08:00
committed by mergify[bot]
parent b261a30c90
commit 224752eced
4 changed files with 31 additions and 0 deletions
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2
OvmfPkg/ResetVector/ResetVector.nasmb
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@@ -83,5 +83,7 @@
%include "Main.asm"
%define SEV_ES_AP_RESET_IP FixedPcdGet32 (PcdSevEsWorkAreaBase)
%define SEV_LAUNCH_SECRET_BASE FixedPcdGet32 (PcdSevLaunchSecretBase)
%define SEV_LAUNCH_SECRET_SIZE FixedPcdGet32 (PcdSevLaunchSecretSize)
%include "Ia16/ResetVectorVtf0.asm"