Note missing module package name

Debian ships different modules in different packages.
By default qemu ignores the fact that it can not load
a module, pretending this module never existed.
Give a useful hint about the package where the module
in question resides.

This is a hack, but it makes qemu a bit more user-friendly.

Gbp-Pq: Name note-missing-module-pkg-name.diff
Signed-off-by: Cong Liu <liucong2@kylinos.cn>

util/module.c

@@ -298,6 +298,19 @@ bool module_load_one(const char *prefix, const char *lib_name, bool mayfail)
     }
 
     if (!success) {
+
+        /* notify user about extra package */
+        const char *pkg = NULL;
+        if (!strcmp(prefix, "block-"))
+           pkg = "qemu-block-extra";
+        else if (!strcmp(prefix, "ui-")
+               || !strcmp(prefix, "audio-")
+               || !strcmp(module_name, "virtio-gpu-gl"))
+           pkg = "qemu-system-gui";
+        if (pkg)
+          fprintf(stderr, "qemu: module %s%s not found, do you want to install %s package?\n",
+                  prefix, module_name, pkg);
+
         g_hash_table_remove(loaded_modules, module_name);
         g_free(module_name);
     }