[PATCH v3 00/30] qapi/qom: QAPIfy --object and object-add

[Paolo Bonzini]

On 11/03/21 11:38, Markus Armbruster wrote:
> Here's a differently terrible hack.  We have
> 
>           keyval_parse()       visitor
>      optarg --------> QObject --------> QAPI type
> 
> Idea: hack the QObject.  If we're working for -object, and QObject maps
> key "qom-type" to value "memory-backend-ram", get the value of
> host-nodes, and if it's a string, parse it into a list like the opts
> visitor does, and put that back, replacing the string value.
> 
> Same for other uses of Memdev and NumaNodeOptions with -object, if they
> exist.

This doesn't help with backwards compatibility, since keyval loses the 
first of host-nodes=0,host-nodes=4.

I would rather keep the OptsVisitor here.  Do the same check for JSON 
syntax that you have in qobject_input_visitor_new_str, and whenever you 
need to walk all -object arguments, use something like this:

     typedef struct ObjectArgument {
         const char *id;
         QDict *json;    /* or NULL for QemuOpts */
         QSIMPLEQ_ENTRY(ObjectArgument) next;
     }

I already had patches in my queue to store -object in a GSList of 
dictionaries, changing it to use the above is easy enough.

Paolo