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Re: [Qemu-devel] [PATCH 1/2] object: Add can_be_deleted callback to Type

From: Andreas Färber
Subject: Re: [Qemu-devel] [PATCH 1/2] object: Add can_be_deleted callback to TypeInfo and TypeImpl
Date: Mon, 23 Mar 2015 14:13:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0


For consistency in git-log, please use "qom:" rather than "object:".

Am 23.03.2015 um 13:06 schrieb Paolo Bonzini:
> On 23/03/2015 11:36, Peter Crosthwaite wrote:
>> I don't think TypeInfo is the right place for this. You can however
>> define function hooks for Object in ObjectClass. See the unparent
>> field of ObjectClass for a precedent.


> In this case, the right place could be UserCreatable.

Maybe, not so familiar with that interface myself. Does object_del allow
to delete non-UserCreatable objects? Then it wouldn't help much.

>  Alternatively...
>> But is a better way to do this to add error handling to
>> object_unparent API and override object_unparent for your device in
>> question to throw the error? Then your change doesn't have to be
>> limited to QMP.
> ... this is also a good choice.

Well, I have doubts about asking someone who's not ultimately familiar
with that code to refactor the API. For instance, we wouldn't want QEMU
on shutdown or in error cases refusing to unparent some object.

Doing it at QMP level (ObjectClass/UserCreatable) seems safer, given
that Chun Yan's trivial block option fix ended up respinning a QemuOpts
refactoring some twenty times before it got merged.


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