Re: [Qemu-devel] [PATCH 3/3] fix qmp/hmp query-memdev not repporting IDs of memory backends

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 9 Jan 2017 14:26:28 -0600
Eric Blake <eblake@redhat.com> wrote:

> On 01/09/2017 08:17 AM, Igor Mammedov wrote:
> 
> >> Wait. Isn't this going to inject an 'id' dict member to every use of
> >> user_creatable_add_type()?  But not all QAPI structs contain an id
> >> member.  Which means that you are now explicitly relying on the visitor
> >> to silently ignore garbage in the dictionary, rather than our desired
> >> goal of only validating if the dictionary exactly matches what the QAPI
> >> says it will match.
> >>
> >> I'm not sure if I like this hack, or if there is a better way to do
> >> things when using a strict (rather than relaxed) input visitor.  
> > a bit less ugly variant but with the same basic idea would look like:
> > --------------
> > Subject: [PATCH] fix qmp/hmp query-memdev not reporting IDs of memory backends   
> >                                                                                  
> > Considering 'id' is mandatory for user_creatable objects/backends                
> > and user_creatable_add_type() always has it as an argument                       
> > regardless of where from it is called CLI/monitor or QMP,                        
> > Fix issue by adding 'id' property to hostmem backends and                        
> > set it in user_creatable_add_type() for every object that                        
> > implements 'id' property. Then later at query-memdev time                        
> > get 'id' from object directly.                       
> 
> Yes, that seems like an improved message.
> 
> >                                                                                  
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com> 
> > 
> > [...]
> > 
> > diff --git a/qom/object_interfaces.c b/qom/object_interfaces.c
> > index 9b4155a..03a95c3 100644
> > --- a/qom/object_interfaces.c
> > +++ b/qom/object_interfaces.c
> > @@ -62,6 +62,12 @@ Object *user_creatable_add_type(const char *type, const char *id,
> >  
> >      assert(qdict);
> >      obj = object_new(type);
> > +    if (object_property_find(obj, "id", NULL)) {
> > +        object_property_set_str(obj, id, "id", &local_err);
> > +        if (local_err) {
> > +            goto out;
> > +        }
> > +    }  
> 
> Works for me.
> 

Thanks,
Then, I'll respin v2 with noted fixups in commit messages
this amended patch.