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

[Paolo Bonzini <pbonzini@redhat.com>]

Il 13/03/2012 13:34, Gerd Hoffmann ha scritto:
> ... 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).
> 
> This is needed in case you have multiple USB busses in a virtual
> machine to make sure the section names are unique.  Obviously this
> will break migration.  I'm sitting on the patch for a while already,
> with the plan to sneak it in when we have a migration flag day anyway
> for the planned new & shiny migration format.
> 
> It doesn't look like this is going to happen anytime soon.  I'd like to
> have this fixed in the 1.1 release.  Suggestions how to go forward?

Add a property to the hcd devices, and set it to false for compatibility
machines?

That is

-    if (id) {
+    if (id && qdev_get_bit(hcd, "full-device-path")) {

BTW, your recently added serial.wakeup property uses a uint32... any
chance you could change it to a bit so that -global isa-serial.wakeup=on
works (nicer than =1 imho)?

Paolo