netdev - Re: [PATCH net-next 5/6] vsock: use local transport when it is loaded

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Date:   Thu, 21 Nov 2019 09:46:14 +0000
From:   Stefan Hajnoczi <stefanha@...il.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        Dexuan Cui <decui@...rosoft.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Jorgen Hansen <jhansen@...are.com>
Subject: Re: [PATCH net-next 5/6] vsock: use local transport when it is loaded

On Tue, Nov 19, 2019 at 12:01:20PM +0100, Stefano Garzarella wrote:
> @@ -420,9 +436,10 @@ int vsock_assign_transport(struct vsock_sock *vsk, struct vsock_sock *psk)
>  		new_transport = transport_dgram;
>  		break;
>  	case SOCK_STREAM:
> -		if (remote_cid <= VMADDR_CID_HOST ||
> -		    (transport_g2h &&
> -		     remote_cid == transport_g2h->get_local_cid()))
> +		if (vsock_use_local_transport(remote_cid))
> +			new_transport = transport_local;
> +		else if (remote_cid == VMADDR_CID_HOST ||
> +			 remote_cid == VMADDR_CID_HYPERVISOR)
>  			new_transport = transport_g2h;
>  		else
>  			new_transport = transport_h2g;

We used to send VMADDR_CID_RESERVED to the host.  Now we send
VMADDR_CID_RESERVED (LOCAL) to the guest when there is no
transport_local loaded?

If this is correct, is there a justification for this change?  It seems
safest to retain existing behavior.

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