Re: [virtio-dev] Re: [PATCH 1/4] content: Introduce driver/device auxiliary notifications

[Cornelia Huck <cohuck@redhat.com>]

On Wed, Aug 10 2022, Halil Pasic <pasic@linux.ibm.com> wrote:

> On Wed, 10 Aug 2022 11:54:35 +0200
> Cornelia Huck <cohuck@redhat.com> wrote:
>
>> >> These device-specific notifications are needed later when adding support
>> >> for virtio-vhost-user device.
>> >> 
>> >> Signed-off-by: Usama Arif <usama.arif@bytedance.com>
>> >> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
>> >> Signed-off-by: Nikos Dragazis <ndragazis@arrikto.com>  
>> >
>> > I see ccw is missing. Cornelia, any suggestions?  
>> 
>> Hmm... I seem to be really behind on ccw things :(
>> 
>> We can probably use the following:
>> 
>> - for device->driver notification, use the next bit in the secondary
>>   indicators (bit 0 is used for config change notification)
>> - for driver->device notification, maybe use a new subcode for diagnose
>>   0x500 (4 is probably the next free one?)
>> 
>
> Sounds reasonable! I will have to double check the DIAG stuff though. I'm
> not sure where what needs to be reserved and documented. 

There's
https://gitlab.com/davidhildenbrand/s390x-os-virt-spec/-/merge_requests/1,
but nothing much has happened there recently. David?