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

From: Andreas Färber
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH 1/8] spapr-iommu: add a bus for spapr-iommu devices
Date: Mon, 14 Apr 2014 17:16:31 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0

Am 10.04.2014 17:18, schrieb Alexey Kardashevskiy:
> On 04/11/2014 12:52 AM, Andreas Färber wrote:
>> Am 10.04.2014 16:40, schrieb Alexey Kardashevskiy:
>>> On 04/10/2014 10:40 PM, Alexander Graf wrote:
>>>> Juan, is a different command line device order supposed to work with
>>>> migration?
>>> We discussed this on IRC with Paolo and the conclusion is that yes, the
>>> order should not matter.
>> 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"! :)


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