diff --git a/arch/powerpc/platforms/powernv/opal-msglog.c b/arch/powerpc/platforms/powernv/opal-msglog.c
index 39d6ff9e56309f4c6bb73a2f1f2000aeb2ba6df9..7a9cde0cfbd110c97d9229baa1f14633e295a3fe 100644
--- a/arch/powerpc/platforms/powernv/opal-msglog.c
+++ b/arch/powerpc/platforms/powernv/opal-msglog.c
@@ -123,6 +123,10 @@ void __init opal_msglog_init(void)
 		return;
 	}
 
+	/* Report maximum size */
+	opal_msglog_attr.size =  be32_to_cpu(mc->ibuf_size) +
+		be32_to_cpu(mc->obuf_size);
+
 	opal_memcons = mc;
 }