From: Jason Wang <redacted>
Date: Fri, 24 Aug 2018 16:53:13 +0800

We don't wakeup the virtqueue if the first byte of pending iova range
is the last byte of the range we just got updated. This will lead a
virtqueue to wait for IOTLB updating forever. Fixing by correct the
check and wake up the virtqueue in this case.

Fixes: 6b1e6cc7855b ("vhost: new device IOTLB API")
Reported-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Jason Wang <redacted>
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The patch is needed for -stable.

Applied and queued up for -stable, thanks Jason.