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From: Thomas Huth <thuth@redhat.com>
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Date: Thu, 4 Jan 2018 13:44:48 +0100
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Subject: Re: [Qemu-devel] [PATCH] usb: Remove legacy -usbdevice option
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: Gerd Hoffmann <kraxel@redhat.com>, QEMU Developers <qemu-devel@nongnu.org>, Samuel Thibault <samuel.thibault@ens-lyon.org>, Paolo Bonzini <pbonzini@redhat.com>

On 04.01.2018 13:33, Peter Maydell wrote:
> On 4 January 2018 at 12:27, Thomas Huth <thuth@redhat.com> wrote:
>> The option has been marked as deprecated since QEMU 2.10, and so far
>> nobody complained that it is urgently required anymore. So let's now
>> get rid of this legacy pile, to simplify the usb code quite a bit.
>>
>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>=20
> 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?

 Thomas