Re: [Qemu-devel] [PATCH] spapr: skip adding usb keyboard/mouse in case of -nodefaults

[Nikunj A Dadhania]

Paolo Bonzini <pbonz...@redhat.com> writes:

> Il 03/04/2014 21:24, Nikunj A Dadhania ha scritto:
>>> > Does libvirt use "-nodefaults -machine usb=true"?  It should create the
>>> > OHCI controller separately instead of using "-machine".
>> I see it creating:
>>
>> -nodefaults -usb -device usb-kbd,id=input0 -device usb-mouse,id=input1
>>
>> And -usb is translated to adding "pci-ohci" controller for spapr
>
> Yeah, but with -nodefaults it's better to use -device directly.

I think there is special handling for this in vl.c

bool usb_enabled(bool default_usb)
{
    return qemu_opt_get_bool(qemu_get_machine_opts(), "usb",
                             has_defaults && default_usb);
}

And spapr.c uses this:

    if (usb_enabled(spapr->has_graphics)) {
        pci_create_simple(phb->bus, -1, "pci-ohci");

Regards
Nikunj