> Thanks for your diff and pointing out this issue.  As far as I
> understand the spec and our code, the following diff should also do the
> trick and avoids redundant calls of ACK and DRIVER.  It also avoids
> general VirtIO device behavior in a specific driver.
>
> ok?
>
> Thanks,
> Jan

Hello Jan,

I tested your alternative patch locally with Cloud Hypervisor and can 
confirm that it fixes the issue.

Thanks for the more generic approach and for getting this committed!

Best,
Leander