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https://github.com/CloverHackyColor/CloverBootloader.git
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75 lines
2.1 KiB
NASM
75 lines
2.1 KiB
NASM
;-----------------------------------------------------------------------------
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; @file
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; OVMF metadata for the AMD SEV confidential computing guests
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;
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; Copyright (c) 2021, AMD Inc. All rights reserved.<BR>
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;
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; SPDX-License-Identifier: BSD-2-Clause-Patent
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;-----------------------------------------------------------------------------
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BITS 64
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%define OVMF_SEV_METADATA_VERSION 1
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; The section must be accepted or validated by the VMM before the boot
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%define OVMF_SECTION_TYPE_SNP_SEC_MEM 0x1
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; AMD SEV-SNP specific sections
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%define OVMF_SECTION_TYPE_SNP_SECRETS 0x2
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;
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; The section contains the hypervisor pre-populated CPUID values.
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; In the case of SEV-SNP, the CPUID values are filtered and measured by
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; the SEV-SNP firmware.
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; The CPUID format is documented in SEV-SNP firmware spec 0.9 section 7.1
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; (CPUID function structure).
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;
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%define OVMF_SECTION_TYPE_CPUID 0x3
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ALIGN 16
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TIMES (15 - ((OvmfSevGuidedStructureEnd - OvmfSevGuidedStructureStart + 15) % 16)) DB 0
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OvmfSevGuidedStructureStart:
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;
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; OvmfSev metadata descriptor
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;
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OvmfSevMetadataGuid:
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_DescriptorSev:
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DB 'A','S','E','V' ; Signature
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DD OvmfSevGuidedStructureEnd - _DescriptorSev ; Length
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DD OVMF_SEV_METADATA_VERSION ; Version
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DD (OvmfSevGuidedStructureEnd - _DescriptorSev - 16) / 12 ; Number of sections
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; Region need to be pre-validated by the hypervisor
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PreValidate1:
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DD SNP_SEC_MEM_BASE_DESC_1
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DD SNP_SEC_MEM_SIZE_DESC_1
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DD OVMF_SECTION_TYPE_SNP_SEC_MEM
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PreValidate2:
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DD SNP_SEC_MEM_BASE_DESC_2
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DD SNP_SEC_MEM_SIZE_DESC_2
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DD OVMF_SECTION_TYPE_SNP_SEC_MEM
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; SEV-SNP Secrets page
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SevSnpSecrets:
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DD SEV_SNP_SECRETS_BASE
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DD SEV_SNP_SECRETS_SIZE
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DD OVMF_SECTION_TYPE_SNP_SECRETS
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; CPUID values
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CpuidSec:
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DD CPUID_BASE
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DD CPUID_SIZE
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DD OVMF_SECTION_TYPE_CPUID
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; Region need to be pre-validated by the hypervisor
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PreValidate3:
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DD SNP_SEC_MEM_BASE_DESC_3
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DD SNP_SEC_MEM_SIZE_DESC_3
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DD OVMF_SECTION_TYPE_SNP_SEC_MEM
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OvmfSevGuidedStructureEnd:
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ALIGN 16
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