diff --git a/libfwupdplugin/fu-efivar.c b/libfwupdplugin/fu-efivar.c
index 39f738990..8e266f571 100644
--- a/libfwupdplugin/fu-efivar.c
+++ b/libfwupdplugin/fu-efivar.c
@@ -395,6 +395,51 @@ fu_efivar_get_names (const gchar *guid, GError **error)
 	return g_steal_pointer (&names);
 }
 
+/**
+ * fu_efivar_space_used:
+ * @error: A #GError
+ *
+ * Gets the total size used by all EFI variables. This may be less than the size reported by the
+ * kernel as some (hopefully small) variables are hidden from userspace.
+ *
+ * Returns: total allocated size of all visible variables, or %G_MAXUINT64 on error
+ *
+ * Since: 1.5.1
+ **/
+guint64
+fu_efivar_space_used (GError **error)
+{
+	const gchar *fn;
+	guint64 total = 0;
+	g_autoptr(GDir) dir = NULL;
+	g_autofree gchar *path = fu_efivar_get_path ();
+
+	/* stat each file */
+	dir = g_dir_open (path, 0, error);
+	if (dir == NULL)
+		return G_MAXUINT64;
+	while ((fn = g_dir_read_name (dir)) != NULL) {
+		guint64 sz;
+		g_autofree gchar *pathfn = g_build_filename (path, fn, NULL);
+		g_autoptr(GFile) file = g_file_new_for_path (pathfn);
+		g_autoptr(GFileInfo) info = NULL;
+
+		info = g_file_query_info (file,
+					  G_FILE_ATTRIBUTE_STANDARD_ALLOCATED_SIZE ","
+					  G_FILE_ATTRIBUTE_STANDARD_SIZE,
+					  G_FILE_QUERY_INFO_NONE,
+					  NULL, error);
+		if (info == NULL)
+			return G_MAXUINT64;
+		sz = g_file_info_get_attribute_uint64 (info, G_FILE_ATTRIBUTE_STANDARD_ALLOCATED_SIZE);
+		if (sz == 0)
+			sz = g_file_info_get_attribute_uint64 (info, G_FILE_ATTRIBUTE_STANDARD_SIZE);
+		total += sz;
+	}
+
+	/* success */
+	return total;
+}
 /**
  * fu_efivar_set_data:
  * @guid: Globally unique identifier
diff --git a/libfwupdplugin/fu-efivar.h b/libfwupdplugin/fu-efivar.h
index 688fd2319..9269db117 100644
--- a/libfwupdplugin/fu-efivar.h
+++ b/libfwupdplugin/fu-efivar.h
@@ -24,6 +24,7 @@
 #define FU_EFIVAR_ATTR_APPEND_WRITE			(1 << 6)
 
 gboolean	 fu_efivar_supported		(GError		**error);
+guint64		 fu_efivar_space_used		(GError		**error);
 gboolean	 fu_efivar_exists		(const gchar	*guid,
 						 const gchar	*name);
 gboolean	 fu_efivar_get_data		(const gchar	*guid,
diff --git a/libfwupdplugin/fu-self-test.c b/libfwupdplugin/fu-self-test.c
index beaa866ec..57af04951 100644
--- a/libfwupdplugin/fu-self-test.c
+++ b/libfwupdplugin/fu-self-test.c
@@ -1824,6 +1824,7 @@ fu_efivar_func (void)
 	gboolean ret;
 	gsize sz = 0;
 	guint32 attr = 0;
+	guint64 total;
 	g_autofree guint8 *data = NULL;
 	g_autoptr(GError) error = NULL;
 	g_autoptr(GPtrArray) names = NULL;
@@ -1833,6 +1834,11 @@ fu_efivar_func (void)
 	g_assert_no_error (error);
 	g_assert_true (ret);
 
+	/* check we can get the space used */
+	total = fu_efivar_space_used (&error);
+	g_assert_no_error (error);
+	g_assert_cmpint (total, ==, 0x2000);
+
 	/* check existing keys */
 	g_assert_false (fu_efivar_exists (FU_EFIVAR_GUID_EFI_GLOBAL, "NotGoingToExist"));
 	g_assert_true (fu_efivar_exists (FU_EFIVAR_GUID_EFI_GLOBAL, "SecureBoot"));
diff --git a/libfwupdplugin/fwupdplugin.map b/libfwupdplugin/fwupdplugin.map
index 22007b07a..4ff42bc00 100644
--- a/libfwupdplugin/fwupdplugin.map
+++ b/libfwupdplugin/fwupdplugin.map
@@ -669,3 +669,9 @@ LIBFWUPDPLUGIN_1.5.0 {
     fu_udev_device_get_subsystem_vendor;
   local: *;
 } LIBFWUPDPLUGIN_1.4.7;
+
+LIBFWUPDPLUGIN_1.5.1 {
+  global:
+    fu_efivar_space_used;
+  local: *;
+} LIBFWUPDPLUGIN_1.5.0;
diff --git a/plugins/uefi-dbx/fu-plugin-uefi-dbx.c b/plugins/uefi-dbx/fu-plugin-uefi-dbx.c
index 9b9315eb2..4a418cd93 100644
--- a/plugins/uefi-dbx/fu-plugin-uefi-dbx.c
+++ b/plugins/uefi-dbx/fu-plugin-uefi-dbx.c
@@ -18,6 +18,7 @@ void
 fu_plugin_init (FuPlugin *plugin)
 {
 	fu_plugin_set_build_hash (plugin, FU_BUILD_HASH);
+	fu_plugin_add_rule (plugin, FU_PLUGIN_RULE_METADATA_SOURCE, "uefi");
 }
 
 gboolean
diff --git a/plugins/uefi/fu-plugin-uefi.c b/plugins/uefi/fu-plugin-uefi.c
index ba0b683ab..f4891cb26 100644
--- a/plugins/uefi/fu-plugin-uefi.c
+++ b/plugins/uefi/fu-plugin-uefi.c
@@ -608,7 +608,9 @@ gboolean
 fu_plugin_startup (FuPlugin *plugin, GError **error)
 {
 	FuPluginData *data = fu_plugin_get_data (plugin);
+	guint64 nvram_total;
 	g_autofree gchar *esp_path = NULL;
+	g_autofree gchar *nvram_total_str = NULL;
 	g_autoptr(GError) error_local = NULL;
 
 	/* some platforms have broken SMBIOS data */
@@ -632,6 +634,11 @@ fu_plugin_startup (FuPlugin *plugin, GError **error)
 	/* are the EFI dirs set up so we can update each device */
 	if (!fu_efivar_supported (error))
 		return FALSE;
+	nvram_total = fu_efivar_space_used (error);
+	if (nvram_total == G_MAXUINT64)
+		return FALSE;
+	nvram_total_str = g_format_size_full (nvram_total, G_FORMAT_SIZE_LONG_FORMAT);
+	fu_plugin_add_report_metadata (plugin, "EfivarNvramUsed", nvram_total_str);
 
 	/* override the default ESP path */
 	esp_path = fu_plugin_get_config_value (plugin, "OverrideESPMountPoint");