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Re: [PATCH 0/2] s390x: ccw: A simple test device for virtio CCW

From: Pierre Morel
Subject: Re: [PATCH 0/2] s390x: ccw: A simple test device for virtio CCW
Date: Wed, 1 Sep 2021 15:59:19 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0

On 8/30/21 10:42 PM, Halil Pasic wrote:
On Mon, 30 Aug 2021 11:51:51 +0200
Christian Borntraeger <borntraeger@de.ibm.com> wrote:

On 27.08.21 12:50, Pierre Morel wrote:
Hello All,

This series presents a VIRTIO test device which receives data on its
input channel and sends back a simple checksum for the data it received
on its output channel.
The goal is to allow a simple VIRTIO device driver to check the VIRTIO
initialization and various data transfer.

Can you please elaborate a little on the objectives.

Yes I will, but I must think a lot more about it, I think doing the specifications you speak about later in this response is the right way to do it.

For this I introduced a new device ID for the device and having no
Linux driver but a kvm-unit-test driver, I have the following

I think we should reserve an ID in the official virtio spec then for such a 
Maybe also add mst for such things.

I agree having ID reserved is a good idea. But then if we are going to
introduce an official test device, I believe we should write a
specification for it as well. Yes having the guarantee that test devices
and real devices won't mix is a value in itself, but if we had a
standardized test device, whoever does work with it would not have to
ask themselves is this test device compatible with this test device

Yes right.

Is there another way to advertise new VIRTIO IDs but Linux?
If this QEMU test meet interest, should I write a Linux test program?

You may not simply claim and advertise a VIRTIO ID. The virtio ids
are allocated by the virtio standardisation body, and the list of the
IDs reserved in the v1.1-cs01 incarnation of the spec can be found here:

For how to contribute to the virtio specification please take look at

Thanks, I will go this way.

Thanks for these constructive answers,


Pierre Morel
IBM Lab Boeblingen

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