[Qemu-devel] live migration fails after host kernel upgrade (3.12 => 3.18)

[Qemu-devel] live migration fails after host kernel upgrade (3.12 => 3.18)

[Stefan Priebe]

Hi,

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

Greets,
Stefan

Re: [Qemu-devel] live migration fails after host kernel upgrade (3.12 => 3.18)

[Stefan Hajnoczi]

[-- Attachment #1: Type: text/plain, Size: 768 bytes --]

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

[-- Attachment #2: Type: application/pgp-signature, Size: 473 bytes --]

Re: [Qemu-devel] live migration fails after host kernel upgrade (3.12 => 3.18)

[Stefan Priebe - Profihost AG]

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
>