Jason Wang d4a60603fa
vhost: introduce vhost_vq_avail_empty() ...
This patch introduces a helper which will return true if we're sure
that the available ring is empty for a specific vq. When we're not
sure, e.g vq access failure, return false instead. This could be used
for busy polling code to exit the busy loop.
Signed-off-by: Jason Wang <jasowang@redhat.com >
Signed-off-by: Michael S. Tsirkin <mst@redhat.com >
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d4a60603fa