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Re: Some questions about virtio-net on Xen x86

  • To: Jiamei Xie <Jiamei.Xie@xxxxxxx>
  • From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
  • Date: Thu, 19 Aug 2021 15:16:07 +0100
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  • Cc: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "Wei Chen" <Wei.Chen@xxxxxxx>, nd <nd@xxxxxxx>
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On Thu, Aug 19, 2021 at 10:38:49AM +0000, Jiamei Xie wrote:
> Hi all,
> I tried to run virtio-net on X86 machine according to the Wiki page 
> https://wiki.xenproject.org/wiki/Virtio_On_Xen. 
> And I Encountered some confusing problems.
> It seems eth0 is not virtio-net, properly a pv-net. I am really confused.
>  I have the following questions:
> 1. Does Xen x86 still support virtio-net based on QEMU backend?

Well, we don't test it, and the libxl toolstack doesn't really help
getting virtio devices.

> 2. If yes, is there anything wrong in my guest config file?

The wiki state that you should add 'xen_emul_unplug=never' to the
guest kernel's command line. (That would be "extra" in your guest.cfg.)
I think that will prevent the virtio-net device from been unplug, and so
you will see the virtio-net device in the guest.

But since libxl create Xen PV device anyway, you'll still have the Xen
PV NIC, so two NICs with the same MAC.

I hope that help,

Anthony PERARD



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