OvmfPkg/AmdSevDxe: Update ConfidentialComputing blob struct definition

The Confidential Computing blob defined here is intended to match the
definition defined by linux guest kernel. Previously, both definitions
relied on natural alignment, but that relies on both OVMF and kernel
being compiled as 64-bit. While there aren't currently any plans to
enable SNP support for 32-bit compilations, the kernel definition has
since been updated to use explicit padding/reserved fields to avoid
this dependency. Update OVMF to match that definition.

While at it, also fix up the Reserved fields to match the numbering
used in the kernel.

No functional changes (for currently-supported environments, at least).

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Jiewen Yao <jiewen.yao@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Michael Roth <michael.roth@amd.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/OvmfPkg/AmdSevDxe/AmdSevDxe.c b/OvmfPkg/AmdSevDxe/AmdSevDxe.c
index df807066fa..db3675ae86 100644
--- a/OvmfPkg/AmdSevDxe/AmdSevDxe.c
+++ b/OvmfPkg/AmdSevDxe/AmdSevDxe.c
@@ -48,11 +48,13 @@ AllocateConfidentialComputingBlob (
 

   CcBlob->Header                 = SIGNATURE_32 ('A', 'M', 'D', 'E');

   CcBlob->Version                = 1;

-  CcBlob->Reserved1              = 0;

+  CcBlob->Reserved               = 0;

   CcBlob->SecretsPhysicalAddress = (UINT64)(UINTN)FixedPcdGet32 (PcdOvmfSnpSecretsBase);

   CcBlob->SecretsSize            = FixedPcdGet32 (PcdOvmfSnpSecretsSize);

+  CcBlob->Reserved1              = 0;

   CcBlob->CpuidPhysicalAddress   = (UINT64)(UINTN)FixedPcdGet32 (PcdOvmfCpuidBase);

   CcBlob->CpuidLSize             = FixedPcdGet32 (PcdOvmfCpuidSize);

+  CcBlob->Reserved2              = 0;

 

   *CcBlobPtr = CcBlob;