Re: [Xen-devel] [PATCH v7 1/2] libxl: usb2 and usb3 controller support for upstream qemu

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

George Dunlap writes ("Re: [PATCH v7 1/2] libxl: usb2 and usb3 controller 
support for upstream qemu"):
> On 12/03/2013 04:17 PM, Ian Jackson wrote:
> > Why do you describe the usbdevice parameter as "old" ?
> 
> usbdevice basically accepts a string to be passed as-is to the qemu 
> command-line after "-usbdevice".  This argement is now deprecated in 
> qemu; although supported in a backwards-compatible fashion (and thus 
> still works with qemu-upstream), it doesn't (I infer from Fabio's 
> description) work with usb2 and usb3.  This is a qemu limitation, not a 
> Xen limitation.

So "usbdevice" is indeed being partially deprecated here, in some
sense, but we don't have a replacement.

I'm not sure that describing it as "old" in the documentation is fair,
then.  Even if it's regarded as "old" by upstream qemu.  A user would
reasonably ask what to use instead.

Perhaps the docs should say "unfortunately this does not work with the
usbdevice parameter" and leave the question of resolving the problem
for another day.

Ian.

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