diff --git a/tools/xenstore/xenstored_control.c b/tools/xenstore/xenstored_control.c
index 3080e47b45..c3587adb3c 100644
--- a/tools/xenstore/xenstored_control.c
+++ b/tools/xenstore/xenstored_control.c
@@ -44,6 +44,38 @@ static int do_control_check(void *ctx, struct connection *conn,
 	return 0;
 }
 
+static int do_control_log(void *ctx, struct connection *conn,
+			  char **vec, int num)
+{
+	if (num != 1)
+		return EINVAL;
+
+	if (!strcmp(vec[0], "on"))
+		reopen_log();
+	else if (!strcmp(vec[0], "off"))
+		close_log();
+	else
+		return EINVAL;
+
+	send_ack(conn, XS_CONTROL);
+	return 0;
+}
+
+static int do_control_logfile(void *ctx, struct connection *conn,
+			      char **vec, int num)
+{
+	if (num != 1)
+		return EINVAL;
+
+	close_log();
+	talloc_free(tracefile);
+	tracefile = talloc_strdup(NULL, vec[0]);
+	reopen_log();
+
+	send_ack(conn, XS_CONTROL);
+	return 0;
+}
+
 static int do_control_print(void *ctx, struct connection *conn,
 			    char **vec, int num)
 {
@@ -60,6 +92,8 @@ static int do_control_help(void *, struct connection *, char **, int);
 
 static struct cmd_s cmds[] = {
 	{ "check", do_control_check, "" },
+	{ "log", do_control_log, "on|off" },
+	{ "logfile", do_control_logfile, "<file>" },
 	{ "print", do_control_print, "<string>" },
 	{ "help", do_control_help, "" },
 };
diff --git a/tools/xenstore/xenstored_core.c b/tools/xenstore/xenstored_core.c
index 94c0a1dde1..1b79a481b6 100644
--- a/tools/xenstore/xenstored_core.c
+++ b/tools/xenstore/xenstored_core.c
@@ -80,7 +80,7 @@ static int tracefd = -1;
 static bool recovery = true;
 static int reopen_log_pipe[2];
 static int reopen_log_pipe0_pollfd_idx = -1;
-static char *tracefile = NULL;
+char *tracefile = NULL;
 static TDB_CONTEXT *tdb_ctx = NULL;
 static bool trigger_talloc_report = false;
 
@@ -205,12 +205,17 @@ static void trigger_reopen_log(int signal __attribute__((unused)))
 	dummy = write(reopen_log_pipe[1], &c, 1);
 }
 
+void close_log(void)
+{
+	if (tracefd >= 0)
+		close(tracefd);
+	tracefd = -1;
+}
 
-static void reopen_log(void)
+void reopen_log(void)
 {
 	if (tracefile) {
-		if (tracefd >= 0)
-			close(tracefd);
+		close_log();
 
 		tracefd = open(tracefile, O_WRONLY|O_CREAT|O_APPEND, 0600);
 
@@ -2030,6 +2035,8 @@ int main(int argc, char *argv[])
 		finish_daemonize();
 
 	signal(SIGHUP, trigger_reopen_log);
+	if (tracefile)
+		tracefile = talloc_strdup(NULL, tracefile);
 
 	/* Get ready to listen to the tools. */
 	initialize_fds(*sock, &sock_pollfd_idx, *ro_sock, &ro_sock_pollfd_idx,
diff --git a/tools/xenstore/xenstored_core.h b/tools/xenstore/xenstored_core.h
index 89c1d75211..d3155683ba 100644
--- a/tools/xenstore/xenstored_core.h
+++ b/tools/xenstore/xenstored_core.h
@@ -168,7 +168,10 @@ void trace_create(const void *data, const char *type);
 void trace_destroy(const void *data, const char *type);
 void trace(const char *fmt, ...);
 void dtrace_io(const struct connection *conn, const struct buffered_data *data, int out);
+void reopen_log(void);
+void close_log(void);
 
+extern char *tracefile;
 extern int dom0_domid;
 extern int dom0_event;
 extern int priv_domid;