Does. there exists race condition in virtio-gpu device

[Li Qiang]

Hello Gerd and Paolo,

I think there is a race condition in virtio-gpu device.
In 'virtio_gpu_reset' and 'virtio_gpu_process_cmdq' they both operate
on 'g->cmdq'.

However the 'virtio_gpu_reset' is in vcpu thread and the
'virtio_gpu_process_cmdq' is
in main thread through BH.

So I think there is a race condition. But I don't find a pattern for
this kind of bug(BH and vcpu thread). I missed anything?

Thanks,
Li Qiang