[PATCH] virtio-net: prevent offloads reset on migration

[Mikhail Sennikovsky]

Hi all,

I've recently faced an issue that the offloads settings of my Windows VM's
tap devices reported with "ethtool -k" get changed after the VM migration.

After a quick look it appears that the offloads always get resent
to the complete set of features the guest has reported.

Here I'm sending a small patch which fixes this with all the detail
in the commit description.

Perhaps a cleaner approach would've been to actually restore the
curr_guest_offloads after the virtio guest device features.
This approach is much less invasive though, and more intended
to illustrate the problem and potentially initiate a further
discussion on the best way of fixing it.


Thanks & Regards,
Mikhail


Mikhail Sennikovsky (1):
  virtio-net: prevent offloads reset on migration

 hw/display/virtio-gpu-base.c |  3 ++-
 hw/net/virtio-net.c          |  5 +++--
 hw/virtio/virtio.c           | 10 +++++-----
 include/hw/virtio/virtio.h   |  2 +-
 4 files changed, 11 insertions(+), 9 deletions(-)

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2.7.4