linux-kernel - Re: [RFC PATCH 2/2] hv_netvsc: Change GPADL teardown order according to Hyper-V version

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Date:   Tue, 30 Jan 2018 11:30:41 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Mohammed Gamal <mgamal@...hat.com>
Cc:     netdev@...r.kernel.org, otubo@...hat.com, sthemmin@...rosoft.com,
        haiyangz@...rosoft.com, linux-kernel@...r.kernel.org,
        devel@...uxdriverproject.org, vkuznets@...hat.com
Subject: Re: [RFC PATCH 2/2] hv_netvsc: Change GPADL teardown order
 according to Hyper-V version

On Tue, 23 Jan 2018 10:34:05 +0100
Mohammed Gamal <mgamal@...hat.com> wrote:

> Commit 0cf737808ae7 ("hv_netvsc: netvsc_teardown_gpadl() split")
> introduced a regression causing VMs not to shutdown on pre-Wind2016
> hosts after netvsc_remove_device() is called. This was caused as the
> GPADL teardown sequence was changed.
> 
> This patch restores the old behavior for pre-Win2016 hosts, while
> keeping the changes from 0cf7378 for Win2016 and higher hosts.
> 
> Signed-off-by: Mohammed Gamal <mgamal@...hat.com>

Investigated the Windows driver to see how it handled this.
It uses NVSP version < 4 to check for older hosts. So that patch
should use that.

Currently testing a version with that change.