Re: [Qemu-devel] What's the next QEMU version after 2.9 ? (or: when is a good point in time to get rid of old interfaces)

[Jason Wang <jasowang@redhat.com>]

On 2017年03月08日 19:22, Thomas Huth wrote:
> On 08.03.2017 11:03, Peter Maydell wrote:
>> On 8 March 2017 at 09:26, Thomas Huth <thuth@redhat.com> wrote:
>>> But anyway, the more important thing that keeps me concerned is: Someone
>>>   once told me that we should get rid of old parameters and interfaces
>>> (like HMP commands) primarily only when we're changing to a new major
>>> version number. As you all know, QEMU has a lot of legacy options, which
>>> are likely rather confusing than helpful for the new users nowadays,
>>> e.g. things like the "-net channel" option (which is fortunately even
>>> hardly documented), but maybe also even the whole vlan/hub concept in
>>> the net code, or legacy parameters like "-usbdevice". If we switch to
>>> version 3.0, could we agree to remove at least some of them?
>> I think if we are going to deprecate and remove options we need
>> a clear transition plan for doing so, which means at least one
>> release where options are "still works, but warn that they
>> are going away with pointer to documentation or similar info
>> about their replacement syntax", before actually dropping them.
> Yes, that's certainly a good idea. But as Daniel suggested in his mail,
> I think we should also have the rule that the option should be marked as
> deprecated in multiple releases first - so that the users have a chance
> to speak up before something gets really removed (otherwise the option
> could be removed right on the first day after the initial release with
> the deprecation message, so there is no time for the user to notice this
> and complain). Not sure whether we need three releases, as Daniel
> suggested, though, but if that's common sense, that's fine for me, too.
>
> Anyway, I've now started a Wiki page where we could track the removal of
> deprecated interfaces:
>
>   http://wiki.qemu-project.org/Features/LegacyRemoval
>
> Feedback / updates / addition of other legacy interfaces is welcome!
>
>   Thomas
>

I think we may want to add mipsnet to the list too. It's kernel driver 
was removed about 3 years ago.

Thanks