Re: [dpdk-dev] [PATCH v5 09/19] vhost: enable fds passing when sending vhost-user messages

[Tiwei Bie <tiwei.bie@intel.com>]

On Tue, Oct 09, 2018 at 10:54:16PM +0200, Maxime Coquelin wrote:
> Passing userfault fds to Qemu will be required for postcopy
> live-migration feature.
> 
> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> ---
>  lib/librte_vhost/vhost_user.c | 27 +++++++++++++++------------
>  1 file changed, 15 insertions(+), 12 deletions(-)
> 
> diff --git a/lib/librte_vhost/vhost_user.c b/lib/librte_vhost/vhost_user.c
> index bce2395a3..99adcedfa 100644
> --- a/lib/librte_vhost/vhost_user.c
> +++ b/lib/librte_vhost/vhost_user.c
> @@ -161,6 +161,7 @@ vhost_user_get_features(struct virtio_net **pdev, struct VhostUserMsg *msg,
>  
>  	msg->payload.u64 = features;
>  	msg->size = sizeof(msg->payload.u64);
> +	msg->fd_num = 0;

When message handlers in this file return VH_RESULT_REPLY,
the msg->fd_num will be zeroed explicitly. Do we also want
to do this in vhost_crypto_msg_post_handler()?

>  
>  	return VH_RESULT_REPLY;
>  }
[...]