# Re: \[PATCH 1/4\] VSOCK DRIVER: Add multi-cid support for guest

- From: Michael S. Tsirkin \<mst@redhat.com\>
- Date: 2021-08-02 20:12:08 
- List: virtualization
- Page: https://ratatoskr.run/virtualization/2021/08/1465730
- Thread: https://ratatoskr.run/kvm/2021/08/1464868/t.md

```text
On Mon, Aug 02, 2021 at 08:07:17PM +0800, fuguancheng wrote:
> diff --git a/include/uapi/linux/virtio_vsock.h b/include/uapi/linux/virtio_vsock.h
> index 3dd3555b2740..0afc14446b01 100644
> --- a/include/uapi/linux/virtio_vsock.h
> +++ b/include/uapi/linux/virtio_vsock.h
> @@ -42,7 +42,8 @@
>  #define VIRTIO_VSOCK_F_SEQPACKET	1	/* SOCK_SEQPACKET supported */
>  
>  struct virtio_vsock_config {
> -	__le64 guest_cid;
> +	__le32 number_cid;
> +	__le64 cids[];
>  } __attribute__((packed));

any host/guest interface change needs to copy the virtio TC.
packing here is a bad idea imho, just add explicit padding.

-- 
MST

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```