Re: lkvm issue: --network mode=user,trans=mmio doesn't work

[Sasha Levin <sasha.levin@oracle.com>]

On 10/12/2013 05:49 AM, Pekka Enberg wrote:
> Hi Peter,
>
> (Adding bunch of CCs.)
>
> On 10/12/13 11:05 AM, Péter Szabó wrote:
>> First, thank you very much for writing lkvm, it's awesome, and very
>> easy to set up.
>>
>> If sending an e-mail to you is not the right way to report lkvm
>> issues, please tell me how I should do it.
>
> Sure, you can report problems to me and I'll do my best to
> try to get them sorted out.
>
>> I'm using afdf92030c7c43b0f9b32b7edbe07ac3b13780f1 from
>> git://github.com/penberg/linux-kvm.git and Linux kernel 3.2.51:
>>
>> config-3.2.51 (42 KB)
>> https://mega.co.nz/#!hgxB1TDJ!SdbX-jp_yr8E6EUJl7t7Tzrh1p4qKxkTHieoss8yu_Y
>> bzImage-3.2.51 (2.0 MB)
>> https://mega.co.nz/#!5lBVmDZL!WpPRWA7ZflevBIPPNGNM_FkkY-ErBNQMoEbw0XePi5I
>>
>> Config:
>>
>> $ grep -E 'VIRTIO|MMIO' .config
>> CONFIG_NET_9P_VIRTIO=y
>> CONFIG_VIRTIO_BLK=y
>> CONFIG_VIRTIO_NET=y
>> CONFIG_VIRTIO_CONSOLE=y
>> CONFIG_HW_RANDOM_VIRTIO=y
>> CONFIG_VIRTIO=y
>> CONFIG_VIRTIO_RING=y
>> CONFIG_VIRTIO_PCI=y
>> CONFIG_VIRTIO_BALLOON=y
>> CONFIG_VIRTIO_MMIO=y
>> CONFIG_HAVE_MMIOTRACE_SUPPORT=y
>>
>> I'm running `lkvm run --network mode=user,trans=mmio', and it fails to
>> create the eth0 device (`cat /proc/net/dev' doesn't show the device).
>> With `lkvm run --network mode=user' everything just works.
>>
>> I have also tried kernels 3.0.99, 3.4.65 an 3.10.15, but they seem to
>> fail the same way.
>>
>> Am I using it correctly?
>
> Asias, Sasha, is mmio transport supported by virtio networking?

It should be. The ARM folks use it all the time (I suppose).

Did you properly define the network device within the guest? MMIO doesn't have automatic detection 
like PCI does.


Thanks,
Sasha