Re: [Qemu-devel] [PATCH] usb: Remove legacy -usbdevice option

[Thomas Huth <thuth@redhat.com>]

On 04.01.2018 13:49, Peter Maydell wrote:
> On 4 January 2018 at 12:44, Thomas Huth <thuth@redhat.com> wrote:
>> On 04.01.2018 13:33, Peter Maydell wrote:
>>> The diffstat is nice, but can we retain the "please use
>>> $NEWOPTION instead of $OLDOPTION" message for a bit?
>>> I'm pretty sure there will be users out there who've
>>> been happily ignoring deprecation notices, and I think
>>> we'll reduce the amount of support traffic if they
>>> get a new QEMU with a specific error message telling them
>>> what they need to fix, rather than one which just prints
>>> a generic "unknown option" message.
>>
>> Sounds like a good idea at the first glance ... but at a second thought:
>> Don't we confuse the management layers like libvirt this way, which
>> might probe for the availability of this option by executing QEMU with
>> this parameter?
> 
> If they do (which I'd hope they don't) then QEMU will
> exit with a failure status code, which they ought to
> identify as "not supported".

OK, makes sense. I'll cook a v2 of the patch accordingly...

 Thomas