From 315d4ce50c72d618240fbbe6673bb9446e7fe083 Mon Sep 17 00:00:00 2001
From: Liu Zixing <liuzixing@hygon.cn>
Date: Sat, 26 Feb 2022 14:39:06 +0800
Subject: [PATCH 06/11] OvmfPkg/BaseMemcryptSevLib: update page status to
 Secure Processor for CSV

For CSV VM, when encrypting/decrypting a shared/private memory region,
guest needs to
 - set/clear the c-bit in guest page table
 - the Secure Processor should be updated accordingly

The BaseMemcryptSevLib has done the first step.
Calling the secure call library for second step.

Signed-off-by: Xin Jiang <jiangxin@hygon.cn>
---
 .../BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf   |  1 +
 .../BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c | 14 ++++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf b/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf
index cc24961..3a1d308 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/DxeMemEncryptSevLib.inf
@@ -52,6 +52,7 @@
   MemoryAllocationLib
   PcdLib
   CcExitLib
+  CsvLib
 
 [FeaturePcd]
   gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c
index dee3fb8..a49cf12 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/PeiDxeVirtualMemory.c
@@ -19,6 +19,8 @@
 #include "VirtualMemory.h"
 #include "SnpPageStateChange.h"
 
+#include <Library/CsvLib.h>
+
 STATIC BOOLEAN          mAddressEncMaskChecked = FALSE;
 STATIC UINT64           mAddressEncMask;
 STATIC PAGE_TABLE_POOL  *mPageTablePool = NULL;
@@ -727,6 +729,11 @@ SetMemoryEncDec (
   BOOLEAN                         IsWpEnabled;
   UINTN                           OrigLength;
   RETURN_STATUS                   Status;
+  PHYSICAL_ADDRESS                PageAddress;
+  UINTN                           PageNum;
+
+  PageAddress = PhysicalAddress;
+  PageNum = EFI_SIZE_TO_PAGES (Length);
 
   //
   // Set PageMapLevel4Entry to suppress incorrect compiler/analyzer warnings.
@@ -991,6 +998,13 @@ Done:
     EnableReadOnlyPageWriteProtect ();
   }
 
+  if (CsvIsEnabled () && Status == EFI_SUCCESS) {
+     if (Mode == ClearCBit)
+       CsvUpdateMemory (PageAddress, PageNum, TRUE);
+     else
+       CsvUpdateMemory (PageAddress, PageNum, FALSE);
+   }
+
   return Status;
 }
 
-- 
2.25.1