RE: [PATCH 0/2] Drivers: hv: vmbus: Miscellaneous improvements

[Dexuan Cui]

> From: linux-hyperv-owner@xxxxxxxxxxxxxxx
> <linux-hyperv-owner@xxxxxxxxxxxxxxx> On Behalf Of Andrea Parri
> Sent: Monday, October 7, 2019 9:31 AM
> 
> Hi all,
> 
> The patchset:
> 
> - simplifies/refactors the VMBus negotiation code by introducing
>   the table of VMBus protocol versions (patch 1/2),
> 
> - enables VMBus protocol versions 5.1 and 5.2 (patch 2/2).
> 
> Thanks,
>   Andrea
> 
> Andrea Parri (2):
>   Drivers: hv: vmbus: Introduce table of VMBus protocol versions
>   Drivers: hv: vmbus: Enable VMBus protocol versions 5.1 and 5.2

Should we add a module parameter to allow the user to specify a lower
protocol version, when the VM runs on the latest host? 

This can be useful for testing and debugging purpose: the variable
"vmbus_proto_version" is referenced by the vmbus driver itself and
some VSC drivers: if we always use the latest available proto version,
some code paths can not be tested on the latest hosts. 

Thanks,
-- Dexuan