system/vl: more error exit into config enumeration code

All of the failures to configure devices will result in QEMU exiting
with an error code. In preparation for passing Error * down the chain
re-name the iterator to foreach_device_config_or_exit and exit using
&error_fatal instead of returning a failure indication.

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250116160306.1709518-9-alex.bennee@linaro.org>

system/vl.c

@@ -1307,7 +1307,15 @@ static void add_device_config(int type, const char *cmdline)
     QTAILQ_INSERT_TAIL(&device_configs, conf, next);
 }
 
-static int foreach_device_config(int type, int (*func)(const char *cmdline))
+/**
+ * foreach_device_config_or_exit(): process per-device configs
+ * @type: device_config type
+ * @func: device specific config function, returning pass/fail
+ *
+ * Any failure is fatal and we exit with an error message.
+ */
+static void foreach_device_config_or_exit(int type,
+                                          int (*func)(const char *cmdline))
 {
     struct device_config *conf;
     int rc;
@@ -1319,10 +1327,10 @@ static int foreach_device_config(int type, int (*func)(const char *cmdline))
         rc = func(conf->cmdline);
         loc_pop(&conf->loc);
         if (rc) {
-            return rc;
+            error_setg(&error_fatal, "failed to configure: %s", conf->cmdline);
+            exit(1);
         }
     }
-    return 0;
 }
 
 static void qemu_disable_default_devices(void)
@@ -2044,12 +2052,9 @@ static void qemu_create_late_backends(void)
     qemu_opts_foreach(qemu_find_opts("mon"),
                       mon_init_func, NULL, &error_fatal);
 
-    if (foreach_device_config(DEV_SERIAL, serial_parse) < 0)
-        exit(1);
-    if (foreach_device_config(DEV_PARALLEL, parallel_parse) < 0)
-        exit(1);
-    if (foreach_device_config(DEV_DEBUGCON, debugcon_parse) < 0)
-        exit(1);
+    foreach_device_config_or_exit(DEV_SERIAL, serial_parse);
+    foreach_device_config_or_exit(DEV_PARALLEL, parallel_parse);
+    foreach_device_config_or_exit(DEV_DEBUGCON, debugcon_parse);
 
     /* now chardevs have been created we may have semihosting to connect */
     qemu_semihosting_chardev_init();
@@ -2667,8 +2672,7 @@ static void qemu_create_cli_devices(void)
 
     /* init USB devices */
     if (machine_usb(current_machine)) {
-        if (foreach_device_config(DEV_USB, usb_parse) < 0)
-            exit(1);
+        foreach_device_config_or_exit(DEV_USB, usb_parse);
     }
 
     /* init generic devices */
@@ -2715,10 +2719,8 @@ static bool qemu_machine_creation_done(Error **errp)
         exit(1);
     }
 
-    if (foreach_device_config(DEV_GDB, gdbserver_start) < 0) {
-        error_setg(errp, "could not start gdbserver");
-        return false;
-    }
+    foreach_device_config_or_exit(DEV_GDB, gdbserver_start);
+
     if (!vga_interface_created && !default_vga &&
         vga_interface_type != VGA_NONE) {
         warn_report("A -vga option was passed but this machine "