[PATCH v2 07/15] OvmfPkg/MemEncryptSevLib: Obtain encryption mask using the new interface

["Lendacky, Thomas" <thomas.lendacky@amd.com>]

From: Tom Lendacky <thomas.lendacky@amd.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3108

The early assembler code performs validation for some of the SEV-related
information, specifically the encryption bit position. The new
MemEncryptSevGetEncryptionMask() interface provides access to this
validated value.

To ensure that we always use a validated encryption mask for an SEV-ES
guest, update all locations that use CPUID to calculate the encryption
mask to use the new interface.

Also, clean up some call areas where extra masking was being performed
and where a function call was being used instead of the local variable
that was just set using the function.

Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Peter Grehan <grehan@freebsd.org>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Cc: Anthony Perard <anthony.perard@citrix.com>
Cc: Julien Grall <julien@xen.org>
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
---
 OvmfPkg/Bhyve/PlatformPei/AmdSev.c                       | 12 ++----------
 OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.c | 15 +++++----------
 OvmfPkg/PlatformPei/AmdSev.c                             | 12 ++----------
 OvmfPkg/XenPlatformPei/AmdSev.c                          | 12 ++----------
 4 files changed, 11 insertions(+), 40 deletions(-)

diff --git a/OvmfPkg/Bhyve/PlatformPei/AmdSev.c b/OvmfPkg/Bhyve/PlatformPei/AmdSev.c
index e484f4b311fe..e3ed78581c1b 100644
--- a/OvmfPkg/Bhyve/PlatformPei/AmdSev.c
+++ b/OvmfPkg/Bhyve/PlatformPei/AmdSev.c
@@ -1,7 +1,7 @@
 /**@file
   Initialize Secure Encrypted Virtualization (SEV) support
 
-  Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>
+  Copyright (c) 2017 - 2020, Advanced Micro Devices. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -15,8 +15,6 @@
 #include <Library/MemEncryptSevLib.h>
 #include <Library/PcdLib.h>
 #include <PiPei.h>
-#include <Register/Amd/Cpuid.h>
-#include <Register/Cpuid.h>
 #include <Register/Intel/SmramSaveStateMap.h>
 
 #include "Platform.h"
@@ -32,7 +30,6 @@ AmdSevInitialize (
   VOID
   )
 {
-  CPUID_MEMORY_ENCRYPTION_INFO_EBX  Ebx;
   UINT64                            EncryptionMask;
   RETURN_STATUS                     PcdStatus;
 
@@ -43,15 +40,10 @@ AmdSevInitialize (
     return;
   }
 
-  //
-  // CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)
-  //
-  AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);
-  EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);
-
   //
   // Set Memory Encryption Mask PCD
   //
+  EncryptionMask = MemEncryptSevGetEncryptionMask ();
   PcdStatus = PcdSet64S (PcdPteMemoryEncryptionAddressOrMask, EncryptionMask);
   ASSERT_RETURN_ERROR (PcdStatus);
 
diff --git a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.c b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.c
index 5e110c84ff81..6422bc53bd5d 100644
--- a/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.c
+++ b/OvmfPkg/Library/BaseMemEncryptSevLib/X64/VirtualMemory.c
@@ -3,7 +3,7 @@
   Virtual Memory Management Services to set or clear the memory encryption bit
 
   Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
-  Copyright (c) 2017, AMD Incorporated. All rights reserved.<BR>
+  Copyright (c) 2017 - 2020, AMD Incorporated. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -12,6 +12,7 @@
 **/
 
 #include <Library/CpuLib.h>
+#include <Library/MemEncryptSevLib.h>
 #include <Register/Amd/Cpuid.h>
 #include <Register/Cpuid.h>
 
@@ -39,17 +40,12 @@ GetMemEncryptionAddressMask (
   )
 {
   UINT64                            EncryptionMask;
-  CPUID_MEMORY_ENCRYPTION_INFO_EBX  Ebx;
 
   if (mAddressEncMaskChecked) {
     return mAddressEncMask;
   }
 
-  //
-  // CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)
-  //
-  AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);
-  EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);
+  EncryptionMask = MemEncryptSevGetEncryptionMask ();
 
   mAddressEncMask = EncryptionMask & PAGING_1G_ADDRESS_MASK_64;
   mAddressEncMaskChecked = TRUE;
@@ -289,8 +285,7 @@ SetPageTablePoolReadOnly (
   LevelSize[3] = SIZE_1GB;
   LevelSize[4] = SIZE_512GB;
 
-  AddressEncMask  = GetMemEncryptionAddressMask() &
-                    PAGING_1G_ADDRESS_MASK_64;
+  AddressEncMask  = GetMemEncryptionAddressMask();
   PageTable       = (UINT64 *)(UINTN)PageTableBase;
   PoolUnitSize    = PAGE_TABLE_POOL_UNIT_SIZE;
 
@@ -437,7 +432,7 @@ Split1GPageTo2M (
 
   AddressEncMask = GetMemEncryptionAddressMask ();
   ASSERT (PageDirectoryEntry != NULL);
-  ASSERT (*PageEntry1G & GetMemEncryptionAddressMask ());
+  ASSERT (*PageEntry1G & AddressEncMask);
   //
   // Fill in 1G page entry.
   //
diff --git a/OvmfPkg/PlatformPei/AmdSev.c b/OvmfPkg/PlatformPei/AmdSev.c
index 4a515a484720..954d53eba4e8 100644
--- a/OvmfPkg/PlatformPei/AmdSev.c
+++ b/OvmfPkg/PlatformPei/AmdSev.c
@@ -1,7 +1,7 @@
 /**@file
   Initialize Secure Encrypted Virtualization (SEV) support
 
-  Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>
+  Copyright (c) 2017 - 2020, Advanced Micro Devices. All rights reserved.<BR>
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
 
@@ -17,9 +17,7 @@
 #include <Library/MemoryAllocationLib.h>
 #include <Library/PcdLib.h>
 #include <PiPei.h>
-#include <Register/Amd/Cpuid.h>
 #include <Register/Amd/Msr.h>
-#include <Register/Cpuid.h>
 #include <Register/Intel/SmramSaveStateMap.h>
 
 #include "Platform.h"
@@ -116,7 +114,6 @@ AmdSevInitialize (
   VOID
   )
 {
-  CPUID_MEMORY_ENCRYPTION_INFO_EBX  Ebx;
   UINT64                            EncryptionMask;
   RETURN_STATUS                     PcdStatus;
 
@@ -127,15 +124,10 @@ AmdSevInitialize (
     return;
   }
 
-  //
-  // CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)
-  //
-  AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);
-  EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);
-
   //
   // Set Memory Encryption Mask PCD
   //
+  EncryptionMask = MemEncryptSevGetEncryptionMask ();
   PcdStatus = PcdSet64S (PcdPteMemoryEncryptionAddressOrMask, EncryptionMask);
   ASSERT_RETURN_ERROR (PcdStatus);
 
diff --git a/OvmfPkg/XenPlatformPei/AmdSev.c b/OvmfPkg/XenPlatformPei/AmdSev.c
index 7ebbb5cc1fd2..4ed448632ae2 100644
--- a/OvmfPkg/XenPlatformPei/AmdSev.c
+++ b/OvmfPkg/XenPlatformPei/AmdSev.c
@@ -1,7 +1,7 @@
 /**@file
   Initialize Secure Encrypted Virtualization (SEV) support
 
-  Copyright (c) 2017, Advanced Micro Devices. All rights reserved.<BR>
+  Copyright (c) 2017 - 2020, Advanced Micro Devices. All rights reserved.<BR>
   Copyright (c) 2019, Citrix Systems, Inc.
 
   SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -14,8 +14,6 @@
 #include <Library/MemEncryptSevLib.h>
 #include <Library/PcdLib.h>
 #include <PiPei.h>
-#include <Register/Amd/Cpuid.h>
-#include <Register/Cpuid.h>
 
 #include "Platform.h"
 
@@ -30,7 +28,6 @@ AmdSevInitialize (
   VOID
   )
 {
-  CPUID_MEMORY_ENCRYPTION_INFO_EBX  Ebx;
   UINT64                            EncryptionMask;
   RETURN_STATUS                     PcdStatus;
 
@@ -41,15 +38,10 @@ AmdSevInitialize (
     return;
   }
 
-  //
-  // CPUID Fn8000_001F[EBX] Bit 0:5 (memory encryption bit position)
-  //
-  AsmCpuid (CPUID_MEMORY_ENCRYPTION_INFO, NULL, &Ebx.Uint32, NULL, NULL);
-  EncryptionMask = LShiftU64 (1, Ebx.Bits.PtePosBits);
-
   //
   // Set Memory Encryption Mask PCD
   //
+  EncryptionMask = MemEncryptSevGetEncryptionMask ();
   PcdStatus = PcdSet64S (PcdPteMemoryEncryptionAddressOrMask, EncryptionMask);
   ASSERT_RETURN_ERROR (PcdStatus);
 
-- 
2.30.0