virtio balloon communicates to the core that in some
configurations vq #s are non-contiguous by setting name
pointer to NULL.
Unfortunately, core then turned around and just made them
contiguous again. Result is that driver is out of spec.
Implement what the API was supposed to do
in the 1st place. Compatibility with buggy hypervisors
is handled inside virtio-balloon, which is the only driver
making use of this facility, so far.
Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
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