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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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19
OvmfPkg/ResetVector/Ia16/ResetVectorVtf0.asm
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@@ -47,6 +47,25 @@ TIMES (15 - ((guidedStructureEnd - guidedStructureStart + 15) % 16)) DB 0
;
guidedStructureStart:
;
; SEV Secret block
;
; This describes the guest ram area where the hypervisor should
; inject the secret. The data format is:
;
; base physical address (32 bit word)
; table length (32 bit word)
;
; GUID (SEV secret block): 4c2eb361-7d9b-4cc3-8081-127c90d3d294
;
sevSecretBlockStart:
DD SEV_LAUNCH_SECRET_BASE
DD SEV_LAUNCH_SECRET_SIZE
DW sevSecretBlockEnd - sevSecretBlockStart
DB 0x61, 0xB3, 0x2E, 0x4C, 0x9B, 0x7D, 0xC3, 0x4C
DB 0x80, 0x81, 0x12, 0x7C, 0x90, 0xD3, 0xD2, 0x94
sevSecretBlockEnd:
;
; SEV-ES Processor Reset support
;