OvmfPkg: DxeTcg2PhysicalPresenceLib: fix bootloop

Flush cache not only when placing request in PPI, but also after clearing old request from PPI. Signed-off-by: Artur Kowalski <[email protected]>
Dasharo · Sep 10, 2024 · fd05f33 · fd05f33
1 parent 1f42592
commit fd05f33
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.c b/OvmfPkg/Library/Tcg2PhysicalPresenceLibQemu/DxeTcg2PhysicalPresenceLib.c
@@ -733,6 +733,8 @@ Tcg2ExecutePendingTpmRequest (
     mPpi->LastRequest = mPpi->Request;
     mPpi->Request = TCG2_PHYSICAL_PRESENCE_NO_ACTION;
     mPpi->RequestParameter = 0;
+
+    WriteBackDataCacheRange(mPpi, sizeof(QEMU_TPM_PPI));
     return;
   }
 
@@ -763,6 +765,7 @@ Tcg2ExecutePendingTpmRequest (
   mPpi->RequestParameter = 0;
 
   if (mPpi->Response == TCG_PP_OPERATION_RESPONSE_USER_ABORT) {
+    WriteBackDataCacheRange(mPpi, sizeof(QEMU_TPM_PPI));
     return;
   }
 
@@ -791,6 +794,7 @@ Tcg2ExecutePendingTpmRequest (
   }
 
   Print (L"Rebooting system to make TPM2 settings in effect\n");
+  WriteBackDataCacheRange(mPpi, sizeof(QEMU_TPM_PPI));
   gRT->ResetSystem (EfiResetCold, EFI_SUCCESS, 0, NULL);
   ASSERT (FALSE);
 }
@@ -903,7 +907,7 @@ Tcg2PhysicalPresenceLibSubmitRequestToPreOSFunction (
 
   mPpi->Request = OperationRequest;
   mPpi->RequestParameter = RequestParameter;
-  WriteBackDataCache();
+  WriteBackDataCacheRange(mPpi, sizeof(QEMU_TPM_PPI));
 
   return TCG_PP_SUBMIT_REQUEST_TO_PREOS_SUCCESS;
 }