Re: [Qemu-devel] [RfC PATCH] usb/vmstate: add parent dev path

[Daniel P. Berrange]

On Fri, Aug 26, 2011 at 12:11:20PM +0200, Gerd Hoffmann wrote:
> ... to make vmstate id string truely unique with multiple host
> controllers, i.e. move from "1/usb-ptr" to "0000:00:01.3/1/usb-ptr"
> (usb tabled connected to piix3 uhci).
> 
> Obvious problem with that is that it breaks migration from and to older
> versions, thats why it is RfC.  I don't see any way to fix the issue
> without breaking though.  So the question is how to deal with that best?

How about keeping the original naming *only* for devices on the first
USB controller. Since it was impossible to start a QEMU process with
2 USB controllers, migration compatibility does not matter for the
naming of devices on the 2nd, 3rd, 4th.... controller.

Daniel
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