vhost-net: save & restore vhost-user acked features
The initial vhost-user connection sets the features to be negotiated with the driver. Renegotiation isn't possible without device reset. To handle reconnection of vhost-user backend, ensure the same set of features are provided, and reuse already acked features. Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com> Tested-by: NYuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: NYuanhan Liu <yuanhan.liu@linux.intel.com> Reviewed-by: NVictor Kaplansky <victork@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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