spice: add display & head options

This allows to specify display and head to use, simliar to vnc.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Message-id: 1487663858-11731-1-git-send-email-kraxel@redhat.com

ui/spice-core.c

@@ -497,6 +497,12 @@ static QemuOptsList qemu_spice_opts = {
         },{
             .name = "seamless-migration",
             .type = QEMU_OPT_BOOL,
+        },{
+            .name = "display",
+            .type = QEMU_OPT_STRING,
+        },{
+            .name = "head",
+            .type = QEMU_OPT_NUMBER,
 #ifdef HAVE_SPICE_GL
         },{
             .name = "gl",

ui/spice-display.c

@@ -1035,9 +1035,26 @@ static void qemu_spice_display_init_one(QemuConsole *con)
 
 void qemu_spice_display_init(void)
 {
-    QemuConsole *con;
+    QemuOptsList *olist = qemu_find_opts("spice");
+    QemuOpts *opts = QTAILQ_FIRST(&olist->head);
+    QemuConsole *spice_con, *con;
+    const char *str;
     int i;
 
+    str = qemu_opt_get(opts, "display");
+    if (str) {
+        int head = qemu_opt_get_number(opts, "head", 0);
+        Error *err = NULL;
+
+        spice_con = qemu_console_lookup_by_device_name(str, head, &err);
+        if (err) {
+            error_report("Failed to lookup display/head");
+            exit(1);
+        }
+    } else {
+        spice_con = NULL;
+    }
+
     for (i = 0;; i++) {
         con = qemu_console_lookup_by_index(i);
         if (!con || !qemu_console_is_graphic(con)) {
@@ -1046,6 +1063,9 @@ void qemu_spice_display_init(void)
         if (qemu_spice_have_display_interface(con)) {
             continue;
         }
+        if (spice_con != NULL && spice_con != con) {
+            continue;
+        }
         qemu_spice_display_init_one(con);
     }
 }