Re: [Qemu-devel] [PATCH] machine: replace underscores in machine's property names

["Andreas Färber" <afaerber@suse.de>]

Am 18.07.2014 18:23, schrieb Marcel Apfelbaum:
> On Fri, 2014-07-18 at 18:10 +0200, Andreas Färber wrote:
>> Hi,
>>
>> Am 18.07.2014 17:59, schrieb Marcel Apfelbaum:
>>> On Fri, 2014-07-18 at 16:25 +0200, Andreas Färber wrote:
>>>> Am 29.06.2014 11:09, schrieb Marcel Apfelbaum:
>>>>> Replaced '_' with '-' to comply with QOM guidelines.
>>>>> Made the conversion from HMP to QMP in vl.c
>>>>>
>>>>> Signed-off-by: Marcel Apfelbaum <marcel.a@redhat.com>
>>>>> ---
>>>>>  hw/core/machine.c |  8 ++++----
>>>>>  vl.c              | 12 +++++++++++-
>>>>>  2 files changed, 15 insertions(+), 5 deletions(-)
>>>> [snip]
>>>>> diff --git a/vl.c b/vl.c
>>>>> index a1686ef..7587c97 100644
>>>>> --- a/vl.c
>>>>> +++ b/vl.c
>>>>> @@ -2820,15 +2820,25 @@ static int object_set_property(const char *name, const char *value, void *opaque
>>>>>      Object *obj = OBJECT(opaque);
>>>>>      StringInputVisitor *siv;
>>>>>      Error *local_err = NULL;
>>>>> +    char *c, *qom_name;
>>>>>  
>>>>>      if (strcmp(name, "qom-type") == 0 || strcmp(name, "id") == 0 ||
>>>>>          strcmp(name, "type") == 0) {
>>>>>          return 0;
>>>>>      }
>>>>>  
>>>>> +    qom_name = g_strdup(name);
>>>>> +    c = qom_name;
>>>>> +    while (*c++) {
>>>>> +        if (*c == '_') {
>>>>> +            *c = '-';
>>>>> +        }
>>>>> +    }
>>>>
>>>> Actually, is this really safe? By my reading, this function handles
>>>> -object as well, which in turn allows - in theory - to instantiate any
>>>> device, where some will still have underscores in their property names.
>>>> Not sure if all non-device objects such as virtio-rng backends have been
>>>> checked?
>>> Hi Andreas,
>>>
>>> I checked and object_set_property is used only be machine right now, so
>>> no problem here.
>>
>> Indeed you are right. If -object is no longer using it, can we drop
>> qom-type handling? What changed there?
> Hi Andreas,
> 
> The check was originally placed there by Paolo for -object handling.
> We need to find out where the "qom-type" property is coming from. (What code is adding it)
> If is added automatically at parse/init time we can't get rid of it.
> If is object specific, it is ok.

It was not a QOM property, it was a QemuOpt parameter for -object and
therefore excluded from the handling like your type property is. Paolo
had dicussed to rename qom-type to type for simplicity and consistency,
but what I don't know is why this function is no longer used.

Andreas

> Paolo, can you please advise?
> 
> Thanks,
> Marcel

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