1 files changed, 31 insertions, 0 deletions
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index 9b71f7c..fb7e21e 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -416,3 +416,34 @@ 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
+      );
+  }
+}