Re: [Qemu-devel] QEMU: PCI bus name on PowerPC platforms

[Paolo Bonzini <pbonzini@redhat.com>]

Il 05/03/2014 15:21, Daniel P. Berrange ha scritto:
>> alpha/typhoon.c:    b = pci_register_bus(dev, "pci",
>> mips/gt64xxx_pci.c:     phb->bus = pci_register_bus(dev, "pci",
>> pci-host/apb.c:    phb->bus = pci_register_bus(DEVICE(phb), "pci",
>> pci-host/bonito.c:    phb->bus = pci_register_bus(DEVICE(dev), "pci",
>> sh4/sh_pci.c:    phb->bus = pci_register_bus(DEVICE(dev), "pci",
>> pci-host/versatile.c:    pci_bus_new_inplace(&s->pci_bus, sizeof(s->pci_bus), DEVICE(obj), "pci",
>>
>> plus pseries which has its own rules because it supports multiple PCI
>> host bridges, but probably can also be changed from "pci" to NULL.
>
> I'm not sure I understand the effect of changing 'pci' to NULL in this
> code, from libvirt's POV. Would using NULL mean we can rely on using
> "pci.0" as the default PCI bus name or not ?

Yes.  But the next bus that the user creates (e.g. from a PCI bridge 
without an "id") would be "pci.1" instead of having a duplicate 
"pci.0").  Needs a bit more testing of course.

Paolo