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Description of problem:
Need to backport these fixes from upstream
which deal with virtio features:

commit 57c3229ba1c5cecae277301b8b16577fbf2de98b
Author: Michael S. Tsirkin <mst>
Date:   Sun May 9 14:35:43 2010 +0300

    virtio-net: return with value in void function
    
    virtio-net has return with value in a void function.
    No idea why does it compile with gcc,
    but this isn't legal C.
    
    Signed-off-by: Michael S. Tsirkin <mst>


commit fae054b070143a60ce40671470292efc2dc58a49
Author: Michael S. Tsirkin <mst>
Date:   Sun May 9 19:42:09 2010 +0300

    virtio: invoke set_features on load
    
    After migration, vhost was not getting features
    acked because set_features callback was never invoked.
    The fix is just to invoke that callback.

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.59.el6.x86_64.rpm