This allows to pass the last failing test from the Windows HLK TPM 2.0
TCG PPI 1.3 tests.

The interface is described in the "TCG Platform Reset Attack
Mitigation Specification", chapter 6 "ACPI _DSM Function". Whether or
not we should have a real implementation remains an open question to me.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
---
 hw/i386/acpi-build.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index 4cb3ac9000..fafc61c9dd 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2072,6 +2072,15 @@ build_tpm_ppi(Aml *dev)
             aml_append(ifctx, aml_return(aml_buffer(1, zerobyte)));
         }
         aml_append(method, ifctx);
+
+       /* dummy MOR Memory Clear for the sake of WLK PPI test */
+        ifctx = aml_if(
+            aml_equal(aml_arg(0),
+                      aml_touuid("376054ED-CC13-4675-901C-4756D7F2D45D")));
+        {
+            aml_append(ifctx, aml_return(aml_int(0)));
+        }
+        aml_append(method, ifctx);
     }
     aml_append(dev, method);
 }
-- 
2.18.0.rc1