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

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Message-ID: <PU1P153MB01691E9B0DD83E521B1E12C0BF9B0@PU1P153MB0169.APCP153.PROD.OUTLOOK.COM>
Date:   Mon, 7 Oct 2019 17:41:10 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     Andrea Parri <parri.andrea@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Sasha Levin <sashal@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        vkuznets <vkuznets@...hat.com>
Subject: RE: [PATCH 0/2] Drivers: hv: vmbus: Miscellaneous improvements

> From: linux-hyperv-owner@...r.kernel.org
> <linux-hyperv-owner@...r.kernel.org> 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