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Description of problem:
With multiport support enabled for the virtio-console code, each console can have its size resized individually. Move away from the config space for console size updates and use control messages instead.

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

This doesn't result in loss of functionality and neither is the interesting case for us to use multiple 'console' ports.  So closing this bug for now; can be considered later when the patches make their way upstream.