Re: [PATCH 0/3] kvm-guest-drivers-linux: Fix GSO/partial csum support on older kernels

[Avi Kivity <avi@qumranet.com>]

Mark McLoughlin wrote:
> Hi,
>         Here's a few patches to fix virtio_net GSO
> and partial csum support under older kernels.
>
>   

Applied all, thanks.  Sorry for the virtio-like latency in processing.

I don't much like the intense hackery involved in this.  The way I think 
it could be done is:

- hack virtio to use an API which is specific to kvm, but matches the 
current upstream API:

    s/net_func/virtio_compat_net_func/

  including data structures.

- define this API on top of the host kernel's real API.  For a recent 
enough kernel, that's a one-to-one mapping:

   virtio_compat_net_func() { return net_func(); }

  for older ones there's a more trickery involved.

  For kvm, this is a fairly successful strategy, but I imagine that for 
virtio-net this will be much, much, more difficult.

- write Documentation/stable_api_nonsense_nonsense.txt.


-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.