Re: [Qemu-devel] Re: [PATCH v2 12/15] monitor: Add basic device state visualization

[Anthony Liguori <aliguori@linux.vnet.ibm.com>]

On 05/24/2010 05:12 PM, Jan Kiszka wrote:
> Anthony Liguori wrote:
>    
>> On 05/24/2010 03:35 PM, Jan Kiszka wrote:
>>      
>>> In contrast to save/loadvm, device_show does not provide a
>>> backward-compatible output. Not only field names can change (as a result
>>> of internal refactoring),
>>>        
>> Field names could change, but that seems unlikely and unnecessary.
>>      
> Actually, this may happen to improve the output format for device_show,
> either via renaming the fields or annotating it (once we have the latter
> mechanism).

I don't think it's a huge win vs. stability.

>> The output of device_show when
>> specifying -M pc-0.13 should always be the same.  If it's not, I believe
>> that's a bug.
>>
>> The output of device_show across multiple qemu versions without
>> specifying a -M could certainly be different but that's to be expected
>> since you have a different hardware model.
>>      
> It will be different as soon as the version_id of a dumped vmstate
> changes, even independent of -M.
>    

But QMP stability is only guaranteed for releases and -M pc-0.12 should 
(in a perfect world) always dump out the same versions regardless of 
whether it's qemu-0.12, qemu-0.13, etc.

Regards,

Anthony Liguori

> Jan
>
>