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Date: Tue, 23 Sep 2014 10:39:45 +0200
From: Paolo Bonzini <pbonzini@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH 0/3] Fix confused output for alias
	properties
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To: "Gonglei (Arei)" <arei.gonglei@huawei.com>, "Michael S. Tsirkin" <mst@redhat.com>
Cc: "agraf@suse.de" <agraf@suse.de>, "Huangweidong (C)" <weidong.huang@huawei.com>, "stefanha@redhat.com" <stefanha@redhat.com>, Markus Armbruster <armbru@redhat.com>, "Huangpeng (Peter)" <peter.huangpeng@huawei.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, "aliguori@amazon.com" <aliguori@amazon.com>, "lcapitulino@redhat.com" <lcapitulino@redhat.com>

Il 23/09/2014 05:09, Gonglei (Arei) ha scritto:
> Hi,
> 
>>>>>> This doesn't change the fact that ObjectProperty is a generic struct,
>>>>>> and adding alias-specific fields there is wrong.
>>>>>
>>>>> OK, Maybe I should find other ways to attach this purpose and
>>>>> avoid layering violation. Thanks!
>>>>
>>>> Unfortunately I cannot think of any.
>>>>
>>>> We could add a description field to ObjectProperty, and replace
>>>> legacy_name with a description.  The output then would be
>>>>
>>>> virtio-blk.drive=str (drive)
> 
> There is a question that the QOM properties are added dynamically.
> When we call qdev_alias_all_properties() adding alias properties to
> the source object all qdev properties on the target DeviceState, how do we
> judge the property's name and set the value of corresponding description field?
> Such as setting virtio-blk-pci.drive.description = "drive".

You use the legacy_name field of PropertyInfo to set the description of
a qdev property, and then let object_property_add_alias() copy the
description.

Paolo