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Date: Mon, 23 Mar 2015 13:16:44 +0100
From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
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Subject: Re: [Qemu-devel] live migration fails after host kernel upgrade
 (3.12 => 3.18)
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To: Stefan Hajnoczi <stefanha@gmail.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

Hi,

Thanks.

I fixed it - there is already a patchseries in 4.0 to fix this. It will
be backported in 3.18.10 or 3.18.11.

Stefan

Am 23.03.2015 um 12:54 schrieb Stefan Hajnoczi:
> On Sun, Mar 15, 2015 at 09:59:25AM +0100, Stefan Priebe wrote:
>> after upgrading the host kernel from 3.12 to 3.18 live migration fails with
>> the following qemu output (guest running on a host with 3.12 => host with
>> 3.18):
>>
>> kvm: Features 0x30afffe3 unsupported. Allowed features: 0x79bfbbe7
>> qemu: warning: error while loading state for instance 0x0 of device
>> '0000:00:12.0/virtio-net'
>> kvm: load of migration failed: Operation not permitted
>>
>> But i can't
> 
> Hi Stefan,
> I haven't checked the exact feature bits but it might be the UFO feature
> problem.  The tun driver was changed to drop a feature, this broke live
> migration.
> 
> Take a look at
> https://lists.linuxfoundation.org/pipermail/virtualization/2015-February/029217.html
> 
> Stefan
>