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

From: Paolo Bonzini
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 1/8] spapr-iommu: add a bus for spapr-iommu devices
Date: Sun, 27 Apr 2014 11:13:54 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

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.


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