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

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH] usb: Remove legacy -usbdevice option
Date: Thu, 4 Jan 2018 12:49:17 +0000

On 4 January 2018 at 12:44, Thomas Huth <address@hidden> 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".

-- PMM

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