[fedora-virt] Windows XP KVM annoyance

[Dor Laor]

On 04/01/2010 02:40 PM, Daniel P. Berrange wrote:
> On Thu, Apr 01, 2010 at 07:32:52AM -0400, Tom Horsley wrote:
>>>> even if it's the same layout
>>>> something almost certainly moved things or flipped a flag of some sort.
>>>
>>> Well, what?  it's a bug.
>>
>> It certainly seemed a bit like a bug to me, but I also can't imagine
>> how it could keep things absolutely identical unless it did something
>> like save the details of the pci slots, interrupt assignments, etc.
>> in the .xml files it dumps, so when you reload the xml in a new
>> distro, it can replicate the details.
>
> As of Fedora 13 we *will* be saving the PCI slots - you'll see in the XML for
> any new guest you define, it will have loads of PCI info there. We also now
> have ability to specify an exact CPU model, so we no longer susceptible to
> changes in host CPU flags.
>
> In Fedora 12 we merely save the machine type eg you'll see the machine type
> in the XML be changed from 'pc' to a specific version like 'pc-0.11'. This
> is enough to keep some OS happy some of the time, but PCI slots is what we
> really need for the full job.
>
>>
>> I've seen the dumped xml - it ain't got that stuff in there :-).
>>
>> It isn't so bad when I'm just trying to boot the machine on a new
>> distro, but I thought live migration was part of the feature set.
>> This seems like an attempt to migrate from f12 to f13 would move
>> the hardware out from under me, something I doubt even a linux
>> KVM could survive :-).
>
> When we have PCI slot persistence you should be able to live migrate between
> different versions of Fedora and have everything just work.

You're talking about migration between f12 -> f13, not live migration 
which is more complex and needs 2 hosts.

>
>
> Daniel