From: "Brijesh Singh" <brijesh.singh@amd.com>
To: devel@edk2.groups.io
Cc: James Bottomley <jejb@linux.ibm.com>, Min Xu <min.m.xu@intel.com>,
Jiewen Yao <jiewen.yao@intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
Jordan Justen <jordan.l.justen@intel.com>,
Ard Biesheuvel <ardb+tianocore@kernel.org>,
Erdem Aktas <erdemaktas@google.com>,
Michael Roth <Michael.Roth@amd.com>,
Gerd Hoffmann <kraxel@redhat.com>,
Brijesh Singh <brijesh.singh@amd.com>,
Michael Roth <michael.roth@amd.com>
Subject: [PATCH v8 30/32] OvmfPkg/PlatformPei: mark cpuid and secrets memory reserved in EFI map
Date: Mon, 20 Sep 2021 13:46:02 -0500 [thread overview]
Message-ID: <20210920184604.31590-31-brijesh.singh@amd.com> (raw)
In-Reply-To: <20210920184604.31590-1-brijesh.singh@amd.com>
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 <michael.roth@amd.com>
Cc: James Bottomley <jejb@linux.ibm.com>
Cc: Min Xu <min.m.xu@intel.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
Cc: Erdem Aktas <erdemaktas@google.com>
Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Brijesh Singh <brijesh.singh@amd.com>
---
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/PlatformPei.inf
index d048b692f155..0a89e1a0760e 100644
--- a/OvmfPkg/PlatformPei/PlatformPei.inf
+++ b/OvmfPkg/PlatformPei/PlatformPei.inf
@@ -112,6 +112,8 @@ [Pcd]
[FixedPcd]
+ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
+ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidSize
gEfiMdePkgTokenSpaceGuid.PcdPciExpressBaseAddress
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIMemoryNVS
gEmbeddedTokenSpaceGuid.PcdMemoryTypeEfiACPIReclaimMemory
@@ -122,6 +124,8 @@ [FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupSize
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaBase
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfWorkAreaSize
+ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSnpSecretsBase
+ gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSnpSecretsSize
[FeaturePcd]
gUefiOvmfPkgTokenSpaceGuid.PcdCsmEnable
diff --git a/OvmfPkg/PlatformPei/Platform.h b/OvmfPkg/PlatformPei/Platform.h
index 8b1d270c2b0b..4169019b4c07 100644
--- a/OvmfPkg/PlatformPei/Platform.h
+++ b/OvmfPkg/PlatformPei/Platform.h
@@ -102,6 +102,11 @@ AmdSevInitialize (
VOID
);
+VOID
+SevInitializeRam (
+ VOID
+ );
+
extern EFI_BOOT_MODE mBootMode;
extern BOOLEAN mS3Supported;
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index b71a4a7304f7..133382407bc5 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -414,3 +414,34 @@ AmdSevInitialize (
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 persist
+ // 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/MemDetect.c
index 2c2c4641ec8a..96487b810014 100644
--- a/OvmfPkg/PlatformPei/MemDetect.c
+++ b/OvmfPkg/PlatformPei/MemDetect.c
@@ -817,6 +817,8 @@ InitializeRamRegions (
{
QemuInitializeRam ();
+ SevInitializeRam ();
+
if (mS3Supported && mBootMode != BOOT_ON_S3_RESUME) {
//
// This is the memory range that will be used for PEI on S3 resume
--
2.25.1
next prev parent reply other threads:[~2021-09-20 18:47 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-20 18:45 [PATCH v8 00/32] Add AMD Secure Nested Paging (SEV-SNP) support Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 01/32] OvmfPkg/SecMain: move SEV specific routines in AmdSev.c Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 02/32] UefiCpuPkg/MpInitLib: " Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 03/32] OvmfPkg/ResetVector: move clearing GHCB in SecMain Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 04/32] OvmfPkg/ResetVector: introduce metadata descriptor for VMM use Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 05/32] OvmfPkg: reserve SNP secrets page Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 06/32] OvmfPkg: reserve CPUID page Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 07/32] OvmfPkg/ResetVector: pre-validate the data pages used in SEC phase Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 08/32] OvmfPkg/ResetVector: use SEV-SNP-validated CPUID values Brijesh Singh
2021-09-22 7:55 ` Gerd Hoffmann
2021-09-22 23:10 ` Michael Roth
2021-09-23 8:25 ` Gerd Hoffmann
2021-09-20 18:45 ` [PATCH v8 09/32] OvmfPkg/MemEncryptSevLib: add MemEncryptSevSnpEnabled() Brijesh Singh
2021-09-22 8:00 ` Gerd Hoffmann
2021-09-24 10:46 ` Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 10/32] OvmfPkg/SecMain: register GHCB gpa for the SEV-SNP guest Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 11/32] OvmfPkg/VmgExitLib: use SEV-SNP-validated CPUID values Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 12/32] OvmfPkg/PlatformPei: register GHCB gpa for the SEV-SNP guest Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 13/32] OvmfPkg/AmdSevDxe: do not use extended PCI config space Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 14/32] OvmfPkg/MemEncryptSevLib: add support to validate system RAM Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 15/32] OvmfPkg/MemEncryptSevLib: add function to check the VMPL0 Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 16/32] OvmfPkg/BaseMemEncryptSevLib: skip the pre-validated system RAM Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 17/32] OvmfPkg/MemEncryptSevLib: add support to validate > 4GB memory in PEI phase Brijesh Singh
2021-09-22 8:21 ` Gerd Hoffmann
2021-09-24 10:48 ` Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 18/32] OvmfPkg/SecMain: validate the memory used for decompressing Fv Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 19/32] OvmfPkg/PlatformPei: validate the system RAM when SNP is active Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 20/32] UefiCpuPkg: Define ConfidentialComputingGuestAttr Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 21/32] OvmfPkg/PlatformPei: set PcdConfidentialComputingAttr when SEV is active Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 22/32] UefiCpuPkg/MpInitLib: use PcdConfidentialComputingAttr to check SEV status Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 23/32] UefiCpuPkg: add PcdGhcbHypervisorFeatures Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 24/32] OvmfPkg/PlatformPei: set the Hypervisor Features PCD Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 25/32] MdePkg/GHCB: increase the GHCB protocol max version Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 26/32] UefiCpuPkg/MpLib: add support to register GHCB GPA when SEV-SNP is enabled Brijesh Singh
2021-09-20 18:45 ` [PATCH v8 27/32] UefiCpuPkg/MpInitLib: use BSP to do extended topology check Brijesh Singh
2021-09-20 18:46 ` [PATCH v8 28/32] OvmfPkg/MemEncryptSevLib: change the page state in the RMP table Brijesh Singh
2021-09-20 18:46 ` [PATCH v8 29/32] OvmfPkg/MemEncryptSevLib: skip page state change for Mmio address Brijesh Singh
2021-09-20 18:46 ` Brijesh Singh [this message]
2021-09-20 18:46 ` [PATCH v8 31/32] OvmfPkg/AmdSev: expose the SNP reserved pages through configuration table Brijesh Singh
2021-09-20 18:46 ` [PATCH v8 32/32] UefiCpuPkg/MpInitLib: Use SEV-SNP AP Creation NAE event to launch APs Brijesh Singh
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