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

From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v2] usb: Remove legacy -usbdevice option
Date: Thu, 4 Jan 2018 15:52:11 +0000

On 4 January 2018 at 15:47, Paolo Bonzini <address@hidden> wrote:
> The point of deprecation is not to make the interface simpler, it is to
> avoid cases where one option is doing too much and/or crossing
> abstraction boundaries, for example -net creating both a device and a
> hub port.
> "-serial" is okay because it only creates the front-end, it's the board
> that decides how to attach it to the back-end.
> -usbdevice creating both a front-end and a back-end is not a problem per
> se.  The issue with -usbdevice is just that it's too much code.
> However, adding magic to "-device usb-braille" that creates both a
> front-end and a back-end is completely the opposite of sane...

Agreed with this.

Is there any mileage in considering the idea of a generic bit
in the option-parsing code that has a table of mappings from
legacy-style-simple-option to complex-set-of-device-etc options,
so we can retain userfriendliness without per-kind-of-thing
special casing, or is that too simplistic to work ?

-- PMM

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