bhyve: add deprecation warning function

Reviewed by:	markj
Differential Revision:	https://reviews.freebsd.org/D58636

usr.sbin/bhyve/amd64/bhyverun_machdep.c

@@ -266,16 +266,8 @@ bhyve_optparse(int argc, char **argv)
 	}
 
 	/* Handle backwards compatibility aliases in config options. */
-	if (get_config_value("lpc.bootrom") != NULL &&
-	    get_config_value("bootrom") == NULL) {
-		warnx("lpc.bootrom is deprecated, use '-o bootrom' instead");
-		set_config_value("bootrom", get_config_value("lpc.bootrom"));
-	}
-	if (get_config_value("lpc.bootvars") != NULL &&
-	    get_config_value("bootvars") == NULL) {
-		warnx("lpc.bootvars is deprecated, use '-o bootvars' instead");
-		set_config_value("bootvars", get_config_value("lpc.bootvars"));
-	}
+	bhyve_cfg_warn("lpc.bootrom", "bootrom");
+	bhyve_cfg_warn("lpc.bootvars", "bootvars");
 }
 
 void

usr.sbin/bhyve/bhyverun.c

@@ -242,6 +242,16 @@ out:
 	return (-1);
 }
 
+void
+bhyve_cfg_warn(const char *old, const char *new)
+{
+	if (get_config_value(old) != NULL &&
+	    get_config_value(new) == NULL) {
+		warnx("'%s' is deprecated, use '%s' instead", old, new);
+		set_config_value(new, get_config_value(old));
+	}
+}
+
 static void
 calc_mem_affinity(size_t vm_memsize)
 {

usr.sbin/bhyve/bhyverun.h

@@ -84,6 +84,7 @@ void bhyve_parse_gdb_options(const char *opt);
 int bhyve_pincpu_parse(const char *opt);
 int bhyve_topology_parse(const char *opt);
 int bhyve_numa_parse(const char *opt);
+void bhyve_cfg_warn(const char *old, const char *new);
 
 void bhyve_init_vcpu(struct vcpu *vcpu);
 void bhyve_start_vcpu(struct vcpu *vcpu, bool bsp);