[Qemu-devel] [PATCH v1 RFC 03/34] qom: create objects in two phases

[Daniel P. Berrange]

Some types of object must be created before chardevs, other types of
object must be created after chardevs. As such there is no option but
to create objects in two phases.

This takes the decision to create as many object types as possible
in the first phase, and only delay those which have a dependency on
the chardevs. Hopefully the set which need delaying will remain
small.

Signed-off-by: Daniel P. Berrange <address@hidden>
---
 vl.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/vl.c b/vl.c
index 74c2681..8aac4ee 100644
--- a/vl.c
+++ b/vl.c
@@ -2591,6 +2591,22 @@ static int machine_set_property(const char *name, const 
char *value,
     return 0;
 }
 
+
+static bool object_create_phase1(const char *type)
+{
+    /* rng-egd requires that -chardev is processed first,
+     * so we must delay it until phase2 */
+    if (g_str_equal(type, "rng-egd")) {
+        return false;
+    }
+    return true;
+}
+
+static bool object_create_phase2(const char *type)
+{
+    return !object_create_phase1(type);
+}
+
 static int object_create(QemuOpts *opts, void *opaque)
 {
     Error *err = NULL;
@@ -2599,6 +2615,7 @@ static int object_create(QemuOpts *opts, void *opaque)
     void *dummy = NULL;
     OptsVisitor *ov;
     QDict *pdict;
+    bool (*type_predicate)(const char *) = opaque;
 
     ov = opts_visitor_new(opts);
     pdict = qemu_opts_to_qdict(opts, NULL);
@@ -2613,6 +2630,9 @@ static int object_create(QemuOpts *opts, void *opaque)
     if (err) {
         goto out;
     }
+    if (!type_predicate(type)) {
+        goto out;
+    }
 
     qdict_del(pdict, "id");
     visit_type_str(opts_get_visitor(ov), &id, "id", &err);
@@ -4008,6 +4028,12 @@ int main(int argc, char **argv, char **envp)
 
     socket_init();
 
+    if (qemu_opts_foreach(qemu_find_opts("object"),
+                          object_create,
+                          object_create_phase1, 0) != 0) {
+        exit(1);
+    }
+
     if (qemu_opts_foreach(qemu_find_opts("chardev"), chardev_init_func, NULL, 
1) != 0)
         exit(1);
 #ifdef CONFIG_VIRTFS
@@ -4027,7 +4053,8 @@ int main(int argc, char **argv, char **envp)
     }
 
     if (qemu_opts_foreach(qemu_find_opts("object"),
-                          object_create, NULL, 0) != 0) {
+                          object_create,
+                          object_create_phase2, 0) != 0) {
         exit(1);
     }
 
-- 
2.1.0