netdev - Re: How to implement message forwarding from one CID to another in vhost driver

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Message-ID: <sejux5gvpakaopre6mk3fyudi2f56hiuxuevfzay3oohg773kd@5odm3x3fryuq>
Date: Tue, 28 May 2024 17:53:37 +0200
From: Stefano Garzarella <sgarzare@...hat.com>
To: Paolo Bonzini <pbonzini@...hat.com>
Cc: Alexander Graf <graf@...zon.com>, Alexander Graf <agraf@...raf.de>, 
	Dorjoy Chowdhury <dorjoychy111@...il.com>, virtualization@...ts.linux.dev, kvm@...r.kernel.org, 
	netdev@...r.kernel.org, stefanha@...hat.com
Subject: Re: How to implement message forwarding from one CID to another in
 vhost driver

On Tue, May 28, 2024 at 05:49:32PM GMT, Paolo Bonzini wrote:
>On Tue, May 28, 2024 at 5:41 PM Stefano Garzarella <sgarzare@...hat.com> wrote:
>> >I think it's either that or implementing virtio-vsock in userspace
>> >(https://lore.kernel.org/qemu-devel/30baeb56-64d2-4ea3-8e53-6a5c50999979@redhat.com/,
>> >search for "To connect host<->guest").
>>
>> For in this case AF_VSOCK can't be used in the host, right?
>> So it's similar to vhost-user-vsock.
>
>Not sure if I understand but in this case QEMU knows which CIDs are
>forwarded to the host (either listen on vsock and connect to the host,
>or vice versa), so there is no kernel and no VMADDR_FLAG_TO_HOST
>involved.
>

I meant that the application in the host that wants to connect to the 
guest cannot use AF_VSOCK in the host, but must use the one where QEMU 
is listening (e.g. AF_INET, AF_UNIX), right?

I think one of Alex's requirements was that the application in the host 
continue to use AF_VSOCK as in their environment.

Stefano