Re: [Qemu-devel] [PATCH v3] libxl: usb2 and usb3 controller support for upstream qemu

[Ian Jackson]

Fabio Fantoni writes ("Re: [PATCH v3] libxl: usb2 and usb3 controller support 
for upstream qemu"):
> Il 12/07/2013 17:33, George Dunlap ha scritto:
> > On 12/07/13 13:36, Fabio Fantoni wrote:
[someone wrote:]
> >>> I'm just curious, why is this so complicated?  Is this likely to be 
> >>> fragile and break in the future?
...
> >> I tried already but there are problems with retrocompatibility:
> >> http://lists.xen.org/archives/html/xen-devel/2013-07/msg00491.html
> >> I was also asking if it is possible to remove some hardcoded options 
> >> without breaking something but I had no reply.
> >
> > So this seems to be a response to the first paragraph ("why is this so 
> > complicated, is it fragile").

I'm afraid that I don't think it's really a sufficient response to
"why is this so complicated, is it fragile?".  "I don't know" is not
very convincing :-).

My worry would be that these options would change their meaning in the
future, or indeed that the whole edifice which requires callers to
specify things at this excruciating level of detail might (sensibly!)
be abolished.

Ian.