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Re: [Qemu-devel] [RFC PATCH 02/15] qdev: store DeviceState's canonical p

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [RFC PATCH 02/15] qdev: store DeviceState's canonical path to use when unparenting
Date: Mon, 04 May 2015 11:35:11 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

On 02/05/2015 00:54, Michael Roth wrote:
>> > 
>> > What about unparenting children devices in the device's unrealize
>> > callback?  It sucks that you have to do it manually, but using stale
>> > canonical paths isn't the nicest thing either.
> That does seems to do the trick. It felt wrong when I first looked at
> it because in some cases the children attach themselves to the parent
> without making making the parent aware,

Can you point to an example?  The parent "owns" its property namespace,
so it would be wrong for a child to attach itself unbeknownst to the parent.

There are a couple cases where an object adds a property to another
object, e.g. the rtc-time property of /machine, but in that case the
property is a well-known name whose setting is "outsourced" by /machine
to the device.


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