UefiCpuPkg/AmdSvsmLib: add AmdSvsmQueryProtocol

AmdSvsmQueryProtocol() is a helper function for QUERY_PROTOCOL
calls of the core svsm protocol.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

UefiCpuPkg/Include/Library/AmdSvsmLib.h

@@ -139,4 +139,13 @@ AmdSvsmVtpmCmd (
   IN OUT UINT8  *Buffer
   );
 
+BOOLEAN
+EFIAPI
+AmdSvsmQueryProtocol (
+  IN  UINT32  ProtocolId,
+  IN  UINT32  ProtocolVersion,
+  OUT UINT32  *ProtocolMin,
+  OUT UINT32  *ProtocolMax
+  );
+
 #endif

UefiCpuPkg/Library/AmdSvsmLibNull/AmdSvsmLibNull.c

@@ -153,3 +153,15 @@ AmdSvsmVtpmCmd (
 {
   return FALSE;
 }
+
+BOOLEAN
+EFIAPI
+AmdSvsmQueryProtocol (
+  IN  UINT32  ProtocolId,
+  IN  UINT32  ProtocolVersion,
+  OUT UINT32  *ProtocolMin,
+  OUT UINT32  *ProtocolMax
+  )
+{
+  return FALSE;
+}