Re: [Qemu-devel] kvm: virtio-net: saved image requires TUN_F_UFO support

[Stefan Priebe - Profihost AG]

HI Paolo,

could this patchset be related?

Greets,
Stefan

Am 06.11.2017 um 10:52 schrieb Stefan Priebe - Profihost AG:
> Hi Paolo,
> 
> Am 06.11.2017 um 10:49 schrieb Paolo Bonzini:
>> On 06/11/2017 10:48, Stefan Priebe - Profihost AG wrote:
>>> Hi Paolo,
>>>
>>> Am 06.11.2017 um 10:40 schrieb Paolo Bonzini:
>>>> On 06/11/2017 10:38, Stefan Priebe - Profihost AG wrote:
>>>>> Hello,
>>>>>
>>>>> i've upgraded some servers from kernel 4.4 to 4.12 - both running Qemu
>>>>> 2.9.1.
>>>>>
>>>>> If i migrate a VM from a host running kernel 4.4 to a host running 4.12
>>>>> i get:
>>>>>
>>>>> kvm: virtio-net: saved image requires TUN_F_UFO support
>>>>> kvm: Failed to load virtio-net-device:tmp
>>>>> kvm: Failed to load virtio-net:virtio
>>>>> kvm: error while loading state for instance 0x0 of device
>>>>> '0000:00:12.0/virtio-net'
>>>>> kvm: load of migration failed: Invalid argument
>>>>>
>>>>>
>>>>> while migrating from 4.12 to 4.4 works fine.
>>>>>
>>>>> Can anybody help? Is this expected?
>>>>
>>>> Can you check why peer_has_ufo failed (in hw/net/virtio-net.c)?
>>>
>>> May be - how can i archieve this? Patching the code is not a problem if
>>> you can give me a hint.
>>>
>>>> Also, did this ioctl fail when the tap device was set up on the 4.12 
>>>> destination?
>>>> int tap_probe_has_ufo(int fd)
>>>> {
>>>>     unsigned offload;
>>>>
>>>>     offload = TUN_F_CSUM | TUN_F_UFO;
>>>>
>>>>     if (ioctl(fd, TUNSETOFFLOAD, offload) < 0)
>>>>         return 0;
>>>>
>>>>     return 1;
>>>> }
>>>
>>> Should there be any kernel output or how can i detect / check it?
>>
>> For both, the simplest answer is probably just using printf.
> 
> arg i missed an important part. The kernel is an opensuse SLE15 one.
> 
> I've seen it contains the following patchset:
> https://www.spinics.net/lists/netdev/msg443821.html
> 
> Greets,
> Stefan
>