sravan/system76-edk2
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

OvmfPkg: Create a calling area used to communicate with the SVSM

Browse Source 
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=4654

An SVSM requires a calling area page whose address (CAA) is used by the
SVSM to communicate and process the SVSM request.

Add a pre-defined page area to the OvmfPkg and AmdSev packages and define
corresponding PCDs used to communicate the location and size of the area.
Keep the AmdSev package in sync with the OvmfPkg and adjust the AmdSev
launch and hash area memory locations.

Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Michael Roth <michael.roth@amd.com>
Cc: Min Xu <min.m.xu@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
This commit is contained in:
Tom Lendacky
2024-03-08 07:32:16 -08:00
committed by mergify[bot]
parent f6bf37c171
commit 5a67a2efa7
8 changed files with 42 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
OvmfPkg/ResetVector/ResetVector.nasmb
View File

@@ -3,7 +3,7 @@
; This file includes all other code files to assemble the reset vector code
;
; Copyright (c) 2008 - 2013, Intel Corporation. All rights reserved.<BR>
; Copyright (c) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
; Copyright (c) 2020 - 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
; SPDX-License-Identifier: BSD-2-Clause-Patent
;
;------------------------------------------------------------------------------
@@ -69,6 +69,8 @@
%define SEV_SNP_SECRETS_SIZE (FixedPcdGet32 (PcdOvmfSnpSecretsSize))
%define CPUID_BASE (FixedPcdGet32 (PcdOvmfCpuidBase))
%define CPUID_SIZE (FixedPcdGet32 (PcdOvmfCpuidSize))
%define SVSM_CAA_BASE (FixedPcdGet32 (PcdOvmfSecSvsmCaaBase))
%define SVSM_CAA_SIZE (FixedPcdGet32 (PcdOvmfSecSvsmCaaSize))
%if (FixedPcdGet32 (PcdSevLaunchSecretBase) > 0)
; There's a reserved page for SEV secrets and hashes; the VMM will fill and
; validate the page, or mark it as a zero page.
@@ -89,7 +91,7 @@
;
%define SNP_SEC_MEM_BASE_DESC_2 (GHCB_BASE + 0x1000)
%define SNP_SEC_MEM_SIZE_DESC_2 (SEV_SNP_SECRETS_BASE - SNP_SEC_MEM_BASE_DESC_2)
%define SNP_SEC_MEM_BASE_DESC_3 (CPUID_BASE + CPUID_SIZE + SEV_SNP_KERNEL_HASHES_SIZE)
%define SNP_SEC_MEM_BASE_DESC_3 (SVSM_CAA_BASE + SVSM_CAA_SIZE + SEV_SNP_KERNEL_HASHES_SIZE)
%define SNP_SEC_MEM_SIZE_DESC_3 (FixedPcdGet32 (PcdOvmfPeiMemFvBase) - SNP_SEC_MEM_BASE_DESC_3)
%ifdef ARCH_X64