[dpdk-stable] [PATCH] vhost: prevent async register
Maxime Coquelin
maxime.coquelin at redhat.com
Mon Jul 5 14:31:16 CEST 2021
On 7/5/21 3:08 PM, Jiayu Hu wrote:
> 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 at intel.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 b97dcf6..cea7c36 100644
> --- a/lib/librte_vhost/vhost.c
> +++ b/lib/librte_vhost/vhost.c
> @@ -1618,6 +1618,11 @@ 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)) {
>
Acked-by: Maxime Coquelin <maxime.coquelin at redhat.com>
Thanks,
Maxime
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