vhost: fix missing increment of log cache count

The log_cache_nb_elem was never incremented, resulting
in all dirty pages to be missed during live migration.

Fixes: c16915b87109 ("vhost: improve dirty pages logging performance")
Cc: stable@dpdk.org
Reported-by: Peng He <xnhp0320@icloud.com>
Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Acked-by: Ilya Maximets <i.maximets@samsung.com>
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>

diff --git a/lib/librte_vhost/vhost.h b/lib/librte_vhost/vhost.h
index 528e01c..786a74f 100644 (file)
--- a/lib/librte_vhost/vhost.h
+++ b/lib/librte_vhost/vhost.h
@@ -429,6 +429,7 @@ vhost_log_cache_page(struct virtio_net *dev, struct vhost_virtqueue *vq,
 
        vq->log_cache[i].offset = offset;
        vq->log_cache[i].val = (1UL << bit_nr);
+       vq->log_cache_nb_elem++;
 }
 
 static __rte_always_inline void