Re: [Qemu-devel] virtio-net sporadic error with QNX 7.0 guest: virtio-net ctrl missing headers

[Jason Wang <jasowang@redhat.com>]

On 2018年09月12日 16:01, Claudio wrote:
> Hello Michael, Jason and all,
>
> I am currently using latest mainline QEMU on x86_64 to run a QNX 7 guest.
>
> QNX 7 is not free software anymore unfortunately, with the
> the last open source versions in the 6.x range.
>
> I am using the official virtio-net guest driver from QNX 7.
>
> During initialization I sporadically get this error message:
>
> $ qemu-system-x86_64 -machine pc,accel=kvm,kernel_irqchip=on -smp 2 -m 2048 -display none -nodefconfig -nodefaults -chardev stdio,mux=on,id=char0 -serial chardev:char0 -monitor none -mon chardev=char0,mode=readline -netdev user,id=user0,hostfwd=udp::9004-:9004 -device virtio-net,netdev=user0 qnx.img
>
> virtio-net ctrl missing headers
>
> and following that my host->guest UDP port forwarding does not work, that is,
> the qemu process shows up as listening on the interface, but no packets appear in the guest.
>
> This error during initialization does not appear every time I launch QEMU.
> It appears to be more or less random.
>
> Whenever the error does not appear, the interface works as expected, and port forwarding works.
>
> Latest commit is
>
> 19b599f7664b ("Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2018-08-27-v2'")
>
> Thanks a lot for any advice!
>
> Ciao,
>
> Claudio
>

Hi:

Please try some early qemu version to make sure it's not a regression of 
qemu. And if 6.X works, it could be bug of guest driver.

Thanks