A full-featured SEV-SNP guest will not rely on the AP jump table, and
will instead use the AP Creation interface defined by the GHCB. However,
a guest is still allowed to use the AP jump table if desired.
However, unlike with SEV-ES guests, SEV-SNP guests should not
store/retrieve the jump table address via GHCB requests to the
hypervisor, they should instead store/retrieve it via the SEV-SNP
secrets page.
This series implements the store side of this for OVMF by introducing a
PCD that can be used to pass the SEV-SNP secrets page address to
UefiCpuPkg, where the jump table address is allocated. It also
introduces a struct that defines the SEV-SNP secrets page format
according to the GHCB v2.01 and SEV-SNP FW ABI specifications.
v4:
- Move storing of jump table address after relevant comment rather
than before it. (Tom)
v3:
- Break up single patch into a set of patches containing the specific
changes for each package. (Ray)
v2:
- Update Secrets OS area to match latest GHCB 2.01 spec (Tom)
- Move Secrets header file into ./Register/AMD subdirectory (Tom)
- Fix CI EccCheck due to assignment in variable declaration
----------------------------------------------------------------
Michael Roth (4):
MdePkg: Add header for SEV-SNP secrets page struct
MdePkg: Add PcdSevSnpSecretsAddress to export SEV-SNP secrets page
OvmfPkg: Initialize the PcdSevSnpSecretsAddress PCD during PEI phase
UefiCpuPkg: Store SEV-SNP AP jump table in the secrets page
MdePkg/Include/Register/Amd/SnpSecretsPage.h | 56
+++++++++++++++++++++++++++++++++++++++++++++++++++++
MdePkg/MdePkg.dec | 4 ++++
OvmfPkg/AmdSev/AmdSevX64.dsc | 3 +++
OvmfPkg/CloudHv/CloudHvX64.dsc | 3 +++
OvmfPkg/IntelTdx/IntelTdxX64.dsc | 3 +++
OvmfPkg/Microvm/MicrovmX64.dsc | 3 +++
OvmfPkg/OvmfPkgIa32.dsc | 3 +++
OvmfPkg/OvmfPkgIa32X64.dsc | 3 +++
OvmfPkg/OvmfPkgX64.dsc | 3 +++
OvmfPkg/PlatformPei/AmdSev.c | 5 +++++
OvmfPkg/PlatformPei/PlatformPei.inf | 1 +
UefiCpuPkg/Library/MpInitLib/DxeMpInitLib.inf | 1 +
UefiCpuPkg/Library/MpInitLib/DxeMpLib.c | 10 ++++++++++
13 files changed, 98 insertions(+)
create mode 100644 MdePkg/Include/Register/Amd/SnpSecretsPage.h
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