diff --git a/src/shared/meson.build b/src/shared/meson.build
index 5b20155b24..0ef34d4bc8 100644
--- a/src/shared/meson.build
+++ b/src/shared/meson.build
@@ -176,6 +176,7 @@ shared_sources = files(
         'varlink-io.systemd.Resolve.c',
         'varlink-io.systemd.UserDatabase.c',
         'varlink-io.systemd.oom.c',
+        'varlink-io.systemd.service.c',
         'varlink-io.systemd.sysext.c',
         'varlink-org.varlink.service.c',
         'verb-log-control.c',
diff --git a/src/shared/varlink-io.systemd.service.c b/src/shared/varlink-io.systemd.service.c
new file mode 100644
index 0000000000..675f949929
--- /dev/null
+++ b/src/shared/varlink-io.systemd.service.c
@@ -0,0 +1,70 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+
+#include <unistd.h>
+
+#include "varlink-io.systemd.service.h"
+
+static VARLINK_DEFINE_METHOD(Ping);
+
+static VARLINK_DEFINE_METHOD(Reload);
+
+static VARLINK_DEFINE_METHOD(
+                SetLogLevel,
+                VARLINK_DEFINE_INPUT(level, VARLINK_INT, 0));
+
+VARLINK_DEFINE_INTERFACE(
+                io_systemd_service,
+                "io.systemd.service",
+                &vl_method_Ping,
+                &vl_method_Reload,
+                &vl_method_SetLogLevel);
+
+int varlink_method_ping(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        assert(link);
+
+        if (json_variant_elements(parameters) > 0)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        log_debug("Received io.systemd.service.Ping");
+
+        return varlink_reply(link, NULL);
+}
+
+int varlink_method_set_log_level(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata) {
+        static const JsonDispatch dispatch_table[] = {
+                {"level", JSON_VARIANT_INTEGER, json_dispatch_int64, 0, JSON_MANDATORY},
+                {}
+        };
+
+        int64_t level;
+        uid_t uid;
+        int r;
+
+        assert(link);
+        assert(parameters);
+
+        /* NOTE: The method does have 1 parameter, but we must compare to 2 here, because
+         * json_variant_elements() breaks abstraction and exposes internal structure of JsonObject. */
+        if (json_variant_elements(parameters) != 2)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        r = json_dispatch(parameters, dispatch_table, NULL, 0, &level);
+        if (r < 0)
+                return r;
+
+        if (LOG_PRI(level) != level)
+                return varlink_error_invalid_parameter(link, parameters);
+
+        r = varlink_get_peer_uid(link, &uid);
+        if (r < 0)
+                return r;
+
+        if (uid != getuid() && uid != 0)
+                return varlink_error(link, VARLINK_ERROR_PERMISSION_DENIED, parameters);
+
+        log_debug("Received io.systemd.service.SetLogLevel(%" PRIi64 ")", level);
+
+        log_set_max_level(level);
+
+        return varlink_reply(link, NULL);
+}
diff --git a/src/shared/varlink-io.systemd.service.h b/src/shared/varlink-io.systemd.service.h
new file mode 100644
index 0000000000..bc90ff0986
--- /dev/null
+++ b/src/shared/varlink-io.systemd.service.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#pragma once
+
+#include "varlink.h"
+#include "varlink-idl.h"
+
+extern const VarlinkInterface vl_interface_io_systemd_service;
+
+int varlink_method_ping(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata);
+int varlink_method_set_log_level(Varlink *link, JsonVariant *parameters, VarlinkMethodFlags flags, void *userdata);
diff --git a/src/test/test-varlink-idl.c b/src/test/test-varlink-idl.c
index 670fc0515d..167e8eaff6 100644
--- a/src/test/test-varlink-idl.c
+++ b/src/test/test-varlink-idl.c
@@ -15,6 +15,7 @@
 #include "varlink-io.systemd.Resolve.h"
 #include "varlink-io.systemd.UserDatabase.h"
 #include "varlink-io.systemd.oom.h"
+#include "varlink-io.systemd.service.h"
 #include "varlink-io.systemd.sysext.h"
 #include "varlink-org.varlink.service.h"
 
@@ -138,6 +139,8 @@ TEST(parse_format) {
         print_separator();
         test_parse_format_one(&vl_interface_io_systemd_PCRExtend);
         print_separator();
+        test_parse_format_one(&vl_interface_io_systemd_service);
+        print_separator();
         test_parse_format_one(&vl_interface_io_systemd_sysext);
         print_separator();
         test_parse_format_one(&vl_interface_xyz_test);