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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; Received: from SATLEXMB03.amd.com (165.204.84.17) by CO1NAM11FT010.mail.protection.outlook.com (10.13.175.88) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.4755.13 via Frontend Transport; Thu, 9 Dec 2021 03:29:25 +0000 Received: from sbrijesh-desktop.amd.com (10.180.168.240) by SATLEXMB03.amd.com (10.181.40.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2375.17; Wed, 8 Dec 2021 21:29:23 -0600 From: "Brijesh Singh" To: CC: James Bottomley , Min Xu , "Jiewen Yao" , Tom Lendacky , "Jordan Justen" , Ard Biesheuvel , Erdem Aktas , "Michael Roth" , Gerd Hoffmann , "Michael D Kinney" , Liming Gao , Zhiguang Liu , Ray Ni , Rahul Kumar , Eric Dong , Brijesh Singh , Michael Roth Subject: [PATCH v14 30/32] OvmfPkg/PlatformPei: mark cpuid and secrets memory reserved in EFI map Date: Wed, 8 Dec 2021 21:27:58 -0600 Message-ID: <20211209032800.3802995-31-brijesh.singh@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20211209032800.3802995-1-brijesh.singh@amd.com> References: <20211209032800.3802995-1-brijesh.singh@amd.com> MIME-Version: 1.0 Return-Path: brijesh.singh@amd.com X-Originating-IP: [10.180.168.240] X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB03.amd.com (10.181.40.144) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 23ccc662-cbc5-4122-3694-08d9bac41996 X-MS-TrafficTypeDiagnostic: BYAPR12MB3638:EE_ X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:7219; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Dec 2021 03:29:25.3704 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 23ccc662-cbc5-4122-3694-08d9bac41996 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT010.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR12MB3638 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain When SEV-SNP is active, the CPUID and Secrets memory range contains the information that is used during the VM boot. The content need to be persist across the kexec boot. Mark the memory range as Reserved in the EFI map so that guest OS or firmware does not use the range as a system RAM. Cc: Michael Roth Cc: James Bottomley Cc: Min Xu Cc: Jiewen Yao Cc: Tom Lendacky Cc: Jordan Justen Cc: Ard Biesheuvel Cc: Erdem Aktas Cc: Gerd Hoffmann Acked-by: Gerd Hoffmann Signed-off-by: Brijesh Singh --- OvmfPkg/PlatformPei/PlatformPei.inf | 4 ++++ OvmfPkg/PlatformPei/Platform.h | 5 +++++ OvmfPkg/PlatformPei/AmdSev.c | 31 +++++++++++++++++++++++++++++ OvmfPkg/PlatformPei/MemDetect.c | 2 ++ 4 files changed, 42 insertions(+) diff --git a/OvmfPkg/PlatformPei/PlatformPei.inf b/OvmfPkg/PlatformPei/Plat= formPei.inf index 3c05b550e4bd..1c56ba275835 100644 --- a/OvmfPkg/PlatformPei/PlatformPei.inf +++ b/OvmfPkg/PlatformPei/PlatformPei.inf @@ -111,6 +111,8 @@ [Pcd] gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures =20 [FixedPcd] + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidSize gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIMemoryNVS gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIReclaimMemory @@ -121,6 +123,8 @@ [FixedPcd] gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupSize gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaSize + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSnpSecretsBase + gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSnpSecretsSize =20 [FeaturePcd] gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.= h index 357b3d4095c3..24e4da4e1d93 100644 --- a/OvmfPkg/PlatformPei/Platform.h +++ b/OvmfPkg/PlatformPei/Platform.h @@ -104,6 +104,11 @@ AmdSevInitialize ( =20 extern EFI_BOOT_MODE mBootMode; =20 +VOID +SevInitializeRam ( + VOID + ); + extern BOOLEAN mS3Supported; =20 extern UINT8 mPhysMemAddressWidth; diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c index 9b71f7cf2fab..fb7e21ec140f 100644 --- a/OvmfPkg/PlatformPei/AmdSev.c +++ b/OvmfPkg/PlatformPei/AmdSev.c @@ -416,3 +416,34 @@ AmdSevInitialize ( =20 ASSERT_RETURN_ERROR (PcdStatus); } + +/** + The function performs SEV specific region initialization. + + **/ +VOID +SevInitializeRam ( + VOID + ) +{ + if (MemEncryptSevSnpIsEnabled ()) { + // + // If SEV-SNP is enabled, reserve the Secrets and CPUID memory area. + // + // This memory range is given to the PSP by the hypervisor to populate + // the information used during the SNP VM boots, and it need to persis= t + // across the kexec boots. Mark it as EfiReservedMemoryType so that + // the guest firmware and OS does not use it as a system memory. + // + BuildMemoryAllocationHob ( + (EFI_PHYSICAL_ADDRESS)(UINTN)PcdGet32 (PcdOvmfSnpSecretsBase), + (UINT64)(UINTN)PcdGet32 (PcdOvmfSnpSecretsSize), + EfiReservedMemoryType + ); + BuildMemoryAllocationHob ( + (EFI_PHYSICAL_ADDRESS)(UINTN)PcdGet32 (PcdOvmfCpuidBase), + (UINT64)(UINTN)PcdGet32 (PcdOvmfCpuidSize), + EfiReservedMemoryType + ); + } +} diff --git a/OvmfPkg/PlatformPei/MemDetect.c b/OvmfPkg/PlatformPei/MemDetec= t.c index 3f59a1ac79f6..738ed0c208ae 100644 --- a/OvmfPkg/PlatformPei/MemDetect.c +++ b/OvmfPkg/PlatformPei/MemDetect.c @@ -871,6 +871,8 @@ InitializeRamRegions ( { QemuInitializeRam (); =20 + SevInitializeRam (); + if (mS3Supported && (mBootMode !=3D BOOT_ON_S3_RESUME)) { // // This is the memory range that will be used for PEI on S3 resume --=20 2.25.1