Re: [Qemu-devel] [BUG] virtio-net linux driver fails to probe on MIPS Malta since 'hw/virtio-pci: fix virtio behaviour'

[Marcel Apfelbaum]

On 03/17/2017 11:57 PM, James Hogan wrote:
> Hi,
>
> I've bisected the following failure of the virtio_net linux v4.10 driver
> to probe in QEMU v2.9.0-rc1 emulating a MIPS Malta machine:
>
> virtio_net virtio0: virtio: device uses modern interface but does not have 
> VIRTIO_F_VERSION_1
> virtio_net: probe of virtio0 failed with error -22
>
> To QEMU commit 9a4c0e220d8a ("hw/virtio-pci: fix virtio behaviour").
>
> It appears that adding ",disable-modern=on,disable-legacy=off" to the
> virtio-net -device makes it work again.
>
> I presume this should really just work out of the box. Any ideas why it
> isn't?

Hi,


This is strange. This commit changes virtio devices from legacy to virtio 
"transitional".
(your command line changes it to legacy)
Linux 4.10 supports virtio modern/transitional (as far as I know) and on QEMU 
side
there is nothing new.

Michael, do you have any idea?

Thanks,
Marcel

> Cheers
> James