[Qemu-devel] Re: [PATCH v3 06/17] qdev: Allow device specification by qtree path for device_del

[Luiz Capitulino <lcapitulino@redhat.com>]

On Sun, 23 May 2010 12:59:19 +0200
Jan Kiszka <jan.kiszka@web.de> wrote:

> From: Jan Kiszka <jan.kiszka@siemens.com>
> 
> Allow to specify the device to be removed via device_del not only by ID
> but also by its full or abbreviated qtree path. For this purpose,
> qdev_find is introduced which combines walking the qtree with searching
> for device IDs if required.

 [...]

>  Arguments:
>  
> -- "id": the device's ID (json-string)
> +- "path": the device's qtree path or unique ID (json-string)
>  
>  Example:
>  
> --> { "execute": "device_del", "arguments": { "id": "net1" } }
> +-> { "execute": "device_del", "arguments": { "path": "net1" } }

 Doesn't seem like a good change to me, besides being incompatible[1] we
shouldn't overload arguments this way in QMP as overloading leads to
interface degradation (harder to use, understand, maintain).

 Maybe we could have both arguments as optional, but one must be passed.

[1] It's 'legal' to break the protocol before 0.13, but this has to be
    coordinated with libvirt so we should have a good reason to do this

>  <- { "return": {} }
>  
>  EQMP