OvmfPkg/QemuFwCfgS3Lib: Disable S3 detection in TDVF

Refer to the section 2.1 of tdx-virtual-firmware-design-guide spec, APCI S3 is not supported in TDVF. Therefore, TDVF should not read the S3 status via fw_cfg and always set it as unsupported. spec: https://cdrdv2.intel.com/v1/dl/getContent/733585 Cc: Erdem Aktas <[email protected]> Cc: Jiewen Yao <[email protected]> Cc: Min Xu <[email protected]> Cc: Gerd Hoffmann <[email protected]> Cc: Elena Reshetova <[email protected]> Signed-off-by: Ceping Sun <[email protected]>
coreboot · Sep 9, 2024 · e571571 · e571571
1 parent 043615a
commit e571571
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c b/OvmfPkg/Library/QemuFwCfgS3Lib/QemuFwCfgS3PeiDxe.c
@@ -7,6 +7,7 @@
   SPDX-License-Identifier: BSD-2-Clause-Patent
 **/
 
+#include <Library/BaseLib.h>
 #include <Library/QemuFwCfgLib.h>
 #include <Library/QemuFwCfgS3Lib.h>
 
@@ -32,6 +33,10 @@ QemuFwCfgS3Enabled (
   UINTN                 FwCfgSize;
   UINT8                 SystemStates[6];
 
+  if (TdIsEnabled ()) {
+    return FALSE;
+  }
+
   Status = QemuFwCfgFindFile ("etc/system-states", &FwCfgItem, &FwCfgSize);
   if ((Status != RETURN_SUCCESS) || (FwCfgSize != sizeof SystemStates)) {
     return FALSE;