vl: list user creatable properties when 'help' is argument

Iterate over the writable class properties, sort and print them out
with the description if available.

Ex: qemu -object memory-backend-file,help
memory-backend-file.align=int
memory-backend-file.discard-data=bool
memory-backend-file.dump=bool - Set to 'off' to exclude from core dump
memory-backend-file.host-nodes=int - Binds memory to the list of NUMA host nodes
memory-backend-file.mem-path=string
memory-backend-file.merge=bool - Mark memory as mergeable
memory-backend-file.pmem=bool
memory-backend-file.policy=HostMemPolicy - Set the NUMA policy
memory-backend-file.prealloc=bool - Preallocate memory
memory-backend-file.share=bool - Mark the memory as private to QEMU or shared
memory-backend-file.size=int - Size of the memory region (ex: 500M)

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/qom/object_interfaces.c b/qom/object_interfaces.c
index 72b97a8bed..941fd63afd 100644
--- a/qom/object_interfaces.c
+++ b/qom/object_interfaces.c
@@ -141,14 +141,14 @@ Object *user_creatable_add_opts(QemuOpts *opts, Error **errp)
 
 int user_creatable_add_opts_foreach(void *opaque, QemuOpts *opts, Error **errp)
 {
-    bool (*type_predicate)(const char *) = opaque;
+    bool (*type_opt_predicate)(const char *, QemuOpts *) = opaque;
     Object *obj = NULL;
     Error *err = NULL;
     const char *type;
 
     type = qemu_opt_get(opts, "qom-type");
-    if (type && type_predicate &&
-        !type_predicate(type)) {
+    if (type && type_opt_predicate &&
+        !type_opt_predicate(type, opts)) {
         return 0;
     }