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From:   Dexuan Cui <decui@microsoft.com>
To:     Andrea Parri <parri.andrea@gmail.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>
CC:     KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Sasha Levin <sashal@kernel.org>,
        Michael Kelley <mikelley@microsoft.com>,
        vkuznets <vkuznets@redhat.com>
Subject: RE: [PATCH 0/2] Drivers: hv: vmbus: Miscellaneous improvements
Thread-Topic: [PATCH 0/2] Drivers: hv: vmbus: Miscellaneous improvements
Thread-Index: AQHVfSzCWxH6B9W5yEWWIcD4kBuhCadPblgQ
Date:   Mon, 7 Oct 2019 17:41:10 +0000
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References: <20191007163115.26197-1-parri.andrea@gmail.com>
In-Reply-To: <20191007163115.26197-1-parri.andrea@gmail.com>
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> From: linux-hyperv-owner@vger.kernel.org
> <linux-hyperv-owner@vger.kernel.org> On Behalf Of Andrea Parri
> Sent: Monday, October 7, 2019 9:31 AM
>=20
> Hi all,
>=20
> The patchset:
>=20
> - simplifies/refactors the VMBus negotiation code by introducing
>   the table of VMBus protocol versions (patch 1/2),
>=20
> - enables VMBus protocol versions 5.1 and 5.2 (patch 2/2).
>=20
> Thanks,
>   Andrea
>=20
> 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?=20

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.=20

Thanks,
-- Dexuan