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

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