diff options
| -rw-r--r-- | OvmfPkg/Library/CcExitLib/CcExitLib.inf | 3 | ||||
| -rw-r--r-- | OvmfPkg/Library/CcExitLib/CcExitVcHandler.c | 29 | ||||
| -rw-r--r-- | OvmfPkg/Library/CcExitLib/SecCcExitLib.inf | 3 |
3 files changed, 31 insertions, 4 deletions
diff --git a/OvmfPkg/Library/CcExitLib/CcExitLib.inf b/OvmfPkg/Library/CcExitLib/CcExitLib.inf index bc75cd5f5a..e09f18453a 100644 --- a/OvmfPkg/Library/CcExitLib/CcExitLib.inf +++ b/OvmfPkg/Library/CcExitLib/CcExitLib.inf @@ -1,7 +1,7 @@ ## @file
# CcExitLib Library.
#
-# Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
+# Copyright (C) 2020 - 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
# Copyright (C) 2020 - 2022, Intel Corporation. All rights reserved.<BR>
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
@@ -41,6 +41,7 @@ DebugLib
LocalApicLib
MemEncryptSevLib
+ AmdSvsmLib
[Pcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfCpuidBase
diff --git a/OvmfPkg/Library/CcExitLib/CcExitVcHandler.c b/OvmfPkg/Library/CcExitLib/CcExitVcHandler.c index 0fc30f7bc4..0b61d28f8b 100644 --- a/OvmfPkg/Library/CcExitLib/CcExitVcHandler.c +++ b/OvmfPkg/Library/CcExitLib/CcExitVcHandler.c @@ -1,7 +1,7 @@ /** @file
X64 #VC Exception Handler functon.
- Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
+ Copyright (C) 2020 - 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
@@ -12,6 +12,7 @@ #include <Library/LocalApicLib.h>
#include <Library/MemEncryptSevLib.h>
#include <Library/CcExitLib.h>
+#include <Library/AmdSvsmLib.h>
#include <Register/Amd/Msr.h>
#include <Register/Intel/Cpuid.h>
#include <IndustryStandard/InstructionParsing.h>
@@ -713,10 +714,29 @@ MsrExit ( IN CC_INSTRUCTION_DATA *InstructionData
)
{
- UINT64 ExitInfo1, Status;
+ MSR_SVSM_CAA_REGISTER Msr;
+ UINT64 ExitInfo1;
+ UINT64 Status;
ExitInfo1 = 0;
+ //
+ // The SVSM CAA MSR is a software implemented MSR and not supported
+ // by the hardware, handle it directly.
+ //
+ if (Regs->Rax == MSR_SVSM_CAA) {
+ // Writes to the SVSM CAA MSR are ignored
+ if (*(InstructionData->OpCodes + 1) == 0x30) {
+ return 0;
+ }
+
+ Msr.Uint64 = AmdSvsmSnpGetCaa ();
+ Regs->Rax = Msr.Bits.Lower32Bits;
+ Regs->Rdx = Msr.Bits.Upper32Bits;
+
+ return 0;
+ }
+
switch (*(InstructionData->OpCodes + 1)) {
case 0x30: // WRMSR
ExitInfo1 = 1;
@@ -1388,6 +1408,11 @@ GetCpuidFw ( *Ebx = (*Ebx & 0xFFFFFF00) | (Ebx2 & 0x000000FF);
/* node ID */
*Ecx = (*Ecx & 0xFFFFFF00) | (Ecx2 & 0x000000FF);
+ } else if (EaxIn == 0x8000001F) {
+ /* Set the SVSM feature bit if running under an SVSM */
+ if (AmdSvsmIsSvsmPresent ()) {
+ *Eax |= BIT28;
+ }
}
Out:
diff --git a/OvmfPkg/Library/CcExitLib/SecCcExitLib.inf b/OvmfPkg/Library/CcExitLib/SecCcExitLib.inf index 811269dd2c..dff6cd2761 100644 --- a/OvmfPkg/Library/CcExitLib/SecCcExitLib.inf +++ b/OvmfPkg/Library/CcExitLib/SecCcExitLib.inf @@ -1,7 +1,7 @@ ## @file
# VMGEXIT Support Library.
#
-# Copyright (C) 2020, Advanced Micro Devices, Inc. All rights reserved.<BR>
+# Copyright (C) 2020 - 2024, Advanced Micro Devices, Inc. All rights reserved.<BR>
# SPDX-License-Identifier: BSD-2-Clause-Patent
#
##
@@ -41,6 +41,7 @@ LocalApicLib
MemEncryptSevLib
PcdLib
+ AmdSvsmLib
[FixedPcd]
gUefiOvmfPkgTokenSpaceGuid.PcdOvmfSecGhcbBackupBase
|