On Mon, Aug 21, 2017 at 01:44:19PM +0200, Gerd Hoffmann wrote:
> Hi,
>
> -ENOCONTEXT
>
> What is the use case?
I want to let libvirt know what are the available
slots/ports/addresses for devices in a machine, before it uses
device_add or -device. This is useful when the machine creates
some devices implicitly, when different machine-types provide
different bus topologies, or when a device was created with no
explicit slot/port/address options.
Currently libvirt work around the lack of such interface by
hardcoding information on the implicitly-created devices/buses
and available slots for each machine-type. See, for example,
src/qemu/qemu_domain_address.c in the libvirt source tree.
>
> > + QTAILQ_FOREACH(port, l, next) {
> > + DeviceSlotInfo *slot = make_slot(BUS(bus));
> > + /*
> > + * TODO: should the "bus" option be included, or is
> > + * "port" enough to identify the USB bus + port?
> > + */
>
> Yes, bus must be included, port alone isn't enough in case multiple usb
> host adapters are present.
Thanks!
--
Eduardo
