* [PATCH 20.11] vhost: prevent async register
@ 2022-08-18 0:57 Jiayu Hu
0 siblings, 0 replies; only message in thread
From: Jiayu Hu @ 2022-08-18 0:57 UTC (permalink / raw)
To: stable; +Cc: weix.ling, xingguang.he, Jiayu Hu
Deadlock may occur if async register function is called inside
vhost callback functions. This patch disables async datapath
by preventing async vhost register.
Signed-off-by: Jiayu Hu <jiayu.hu@intel.com>
Acked-by: Maxime Coquelin <maxime.coquelin@redhat.com>
---
lib/librte_vhost/vhost.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/lib/librte_vhost/vhost.c b/lib/librte_vhost/vhost.c
index b83cf63..530a960 100644
--- a/lib/librte_vhost/vhost.c
+++ b/lib/librte_vhost/vhost.c
@@ -1608,6 +1608,11 @@ int rte_vhost_async_channel_register(int vid, uint16_t queue_id,
ops->transfer_data == NULL))
return -1;
+ VHOST_LOG_CONFIG(ERR, "async vhost is not supported by 20.11 LTS, "
+ "as deadlock may occur if this function is called "
+ "inside vhost callback functions.");
+ return -1;
+
rte_spinlock_lock(&vq->access_lock);
if (unlikely(vq->async_registered)) {
--
2.7.4
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