OvmfPkg/ResetVector/X64/OvmfSevMetadata.asm

   1 ;-----------------------------------------------------------------------------
   2 ; @file
   3 ; OVMF metadata for the AMD SEV confidential computing guests
   4 ;
   5 ; Copyright (c) 2021, AMD Inc. All rights reserved.<BR>
   6 ;
   7 ; SPDX-License-Identifier: BSD-2-Clause-Patent
   8 ;-----------------------------------------------------------------------------
   9
  10 BITS  64
  11
  12 %define OVMF_SEV_METADATA_VERSION     1
  13
  14 ; The section must be accepted or validated by the VMM before the boot
  15 %define OVMF_SECTION_TYPE_SNP_SEC_MEM     0x1
  16
  17 ; AMD SEV-SNP specific sections
  18 %define OVMF_SECTION_TYPE_SNP_SECRETS     0x2
  19
  20 ;
  21 ; The section contains the hypervisor pre-populated CPUID values.
  22 ; In the case of SEV-SNP, the CPUID values are filtered and measured by
  23 ; the SEV-SNP firmware.
  24 ; The CPUID format is documented in SEV-SNP firmware spec 0.9 section 7.1
  25 ; (CPUID function structure).
  26 ;
  27 %define OVMF_SECTION_TYPE_CPUID           0x3
  28
  29
  30 ALIGN 16
  31
  32 TIMES (15 - ((OvmfSevGuidedStructureEnd - OvmfSevGuidedStructureStart + 15) % 16)) DB 0
  33
  34 OvmfSevGuidedStructureStart:
  35 ;
  36 ; OvmfSev metadata descriptor
  37 ;
  38 OvmfSevMetadataGuid:
  39
  40 _DescriptorSev:
  41   DB 'A','S','E','V'                                        ; Signature
  42   DD OvmfSevGuidedStructureEnd - _DescriptorSev             ; Length
  43   DD OVMF_SEV_METADATA_VERSION                              ; Version
  44   DD (OvmfSevGuidedStructureEnd - _DescriptorSev - 16) / 12 ; Number of sections
  45
  46 ; SEV-SNP Secrets page
  47 SevSnpSecrets:
  48   DD  SEV_SNP_SECRETS_BASE
  49   DD  SEV_SNP_SECRETS_SIZE
  50   DD  OVMF_SECTION_TYPE_SNP_SECRETS
  51
  52 ; CPUID values
  53 CpuidSec:
  54   DD  CPUID_BASE
  55   DD  CPUID_SIZE
  56   DD  OVMF_SECTION_TYPE_CPUID
  57
  58 OvmfSevGuidedStructureEnd:
  59   ALIGN   16