Re: [Qemu-ppc] [Qemu-devel] [PATCH 1/8] spapr-iommu: add a bus for spapr-iommu devices

[Paolo Bonzini]

Il 14/04/2014 17:16, Andreas Färber ha scritto:
> > > >> Huh?! If you ever tried changing the order of PCI devices such as
> > > >> virtio-blk-pci on the command line (or changing between if=virtio and
> > > >> -device virtio-blk-pci) then surely it does change the order of the
> > > >> /dev/vdX the guest sees and will be migration-incompatible. The order of
> > > >> -drive and -device however, for instance, does not seem to matter. But
> > > >> in this generality, your statement does not seem to reflect current reality.
> > >
> > > As far as I can tell libvirt is trying to be precise and specifies PCI bus
> > > name and PCI address for PCI devices.
> Now that is very different from a generic "the device order should not
> matter"! :)

It is. :)

In any case, if you do not implement something like "irq" property for 
every device, you can forget about oVirt ever supporting migration 
reliably on sPAPR.

Paolo