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

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Date:   Mon, 2 Aug 2021 16:11:57 -0400
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     fuguancheng <fuguancheng@...edance.com>
Cc:     jasowang@...hat.com, stefanha@...hat.com, sgarzare@...hat.com,
        davem@...emloft.net, kuba@...nel.org, arseny.krasnov@...persky.com,
        andraprs@...zon.com, colin.king@...onical.com, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] VSOCK DRIVER: Add multi-cid support for guest

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