Re: [PATCH v7] virtio-vsock: Add support for multi devices

On Sat, Apr 12, 2025 at 10:39 PM Xuewei Niu <[email protected]> wrote:
>
> This patch brings a new feature, called "multi devices", to the virtio
> vsock. It introduces a "VIRTIO_VSOCK_F_MULTI_DEVICES" feature bit, and a
> "device_order" field to the config for the virtio vsock.
>
> == Motivition ==
>
> Vsock is a lightweight and widely used data exchange mechanism between host
> and guest. Currently, the virtio-vsock only supports one device, resulting
> in the inability to enable more than one backend.

I wonder which part of the spec forbids more than one device.

> For instance, two devices
> are required: one to transfer data to the VMM via virtio-vsock, and another
> to a user process via vhost-user-vsock.
>
> Apart from that, a side gain is that theoretically the performance might be
> improved since each device has its own queue. But it varies depending on
> the implementation.

It could implement multiqueue anyhow.

Thanks