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Re: [Qemu-devel] [PATCH v2] usb: Remove legacy -usbdevice option

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH v2] usb: Remove legacy -usbdevice option
Date: Tue, 9 Jan 2018 12:17:46 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.5.0

On 09/01/2018 12:00, Thomas Huth wrote:
> On 09.01.2018 10:58, Paolo Bonzini wrote:
>> On 08/01/2018 08:23, Thomas Huth wrote:
>>>>> But instead of introducing a new "-braille" parameter, maybe we should
>>>>> rather keep some of the convenience "-usbdevice" possibilities around?
>>>>> E.g. keep "-usbdevice braille", "-usbdevice mouse", etc. but remove
>>>>> things like "-usbdevice serial" and "-usbdevice host" where the code is
>>>>> rather ugly and the user do not gain much in comparison to "-device" ?
>>>> That would work too.  But I'm not sure why keep all the usbdevice
>>>> infrastructure when we can do the same (at the price of a small cmdline
>>>> incompatibility) with only 50 lines of code.
>>> I'm just afraid that we will end up with more new parameters in the end
>>> than just "-braille" - or do we feel confident enough that "-usbdevice
>>> braille" is the only one that would need a sugared replacement?
>> I agree that we should plan for suboptions, so it could be "-braille
>> [serial|usb]" for now.
> I'm rather afraid that someone else will also complain about the removal
> of the other usbdevice options, so that we'll finally end up with new
> -usbhost, -usbbt and -usbyounameit convenience options... in that case
> it might be better to keep "-usbdevice" instead?

We can and should say no.  Sometimes we can also say yes though. :)

I just think that Braille is worth a special case because a subset of
our user base (blind people) will use it 100% of the time, plus it is
not supported by libvirt and hence virt-manager.


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