OvmfPkg/SerializeVariablesLib: Relax check for the read-only variable

When OVMF tried to restore the variables from the file-based NvVars, it
failed to set the read-only variable and aborted the restoration with
this message:

Variable Check ReadOnly variable fail Write Protected - 04B37FE8-F6AE-480B-BDD5-37D98C5E89AA:VarErrorFlag

Since it's a read-only variable maintained by the firmware, it's
pointless to restore the previous value, so the check can be
relaxed to allow EFI_WRITE_PROTECTED returned from SetVariable.

Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Gary Lin <glin@suse.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/OvmfPkg/Library/SerializeVariablesLib/SerializeVariablesLib.c b/OvmfPkg/Library/SerializeVariablesLib/SerializeVariablesLib.c
index 3a24edcd48..a1a3d188f2 100644
--- a/OvmfPkg/Library/SerializeVariablesLib/SerializeVariablesLib.c
+++ b/OvmfPkg/Library/SerializeVariablesLib/SerializeVariablesLib.c
@@ -302,6 +302,11 @@ IterateVariablesCallbackSetSystemVariable (
             "failed with EFI_SECURITY_VIOLATION, ignoring\n", __FUNCTION__,

             VariableName));

     Status = EFI_SUCCESS;

+  } else if (Status == EFI_WRITE_PROTECTED) {

+    DEBUG ((DEBUG_WARN, "%a: setting ReadOnly variable \"%s\" "

+            "failed with EFI_WRITE_PROTECTED, ignoring\n", __FUNCTION__,

+            VariableName));

+    Status = EFI_SUCCESS;

   }

   return Status;

 }