plugins/lockstep: make socket path not positional & parse bool arg

Signed-off-by: Mahmoud Mandour <ma.mandourr@gmail.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20210730135817.17816-6-ma.mandourr@gmail.com>

contrib/plugins/lockstep.c

@@ -319,22 +319,35 @@ QEMU_PLUGIN_EXPORT int qemu_plugin_install(qemu_plugin_id_t id,
                                            int argc, char **argv)
 {
     int i;
-
-    if (!argc || !argv[0]) {
-        qemu_plugin_outs("Need a socket path to talk to other instance.");
-        return -1;
-    }
+    g_autofree char *sock_path = NULL;
 
     for (i = 0; i < argc; i++) {
         char *p = argv[i];
-        if (strcmp(p, "verbose") == 0) {
-            verbose = true;
-        } else if (!setup_unix_socket(argv[0])) {
-            qemu_plugin_outs("Failed to setup socket for communications.");
+        g_autofree char **tokens = g_strsplit(p, "=", 2);
+
+        if (g_strcmp0(tokens[0], "verbose") == 0) {
+            if (!qemu_plugin_bool_parse(tokens[0], tokens[1], &verbose)) {
+                fprintf(stderr, "boolean argument parsing failed: %s\n", p);
+                return -1;
+            }
+        } else if (g_strcmp0(tokens[0], "sockpath") == 0) {
+            sock_path = tokens[1];
+        } else {
+            fprintf(stderr, "option parsing failed: %s\n", p);
             return -1;
         }
     }
 
+    if (sock_path == NULL) {
+        fprintf(stderr, "Need a socket path to talk to other instance.\n");
+        return -1;
+    }
+
+    if (!setup_unix_socket(sock_path)) {
+        fprintf(stderr, "Failed to setup socket for communications.\n");
+        return -1;
+    }
+
     our_id = id;
 
     qemu_plugin_register_vcpu_tb_trans_cb(id, vcpu_tb_trans);

docs/devel/tcg-plugins.rst

@@ -286,7 +286,7 @@ communicate over::
 
   ./sparc-softmmu/qemu-system-sparc -monitor none -parallel none \
     -net none -M SS-20 -m 256 -kernel day11/zImage.elf \
-    -plugin ./contrib/plugins/liblockstep.so,arg=lockstep-sparc.sock \
+    -plugin ./contrib/plugins/liblockstep.so,sockpath=lockstep-sparc.sock \
   -d plugin,nochain
 
 which will eventually report::