linux-kernel - Re: [PATCH v3] Drivers: hv: vmbus: Fix Suspend-to-Idle for Generation-2 VM

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Date:   Tue, 14 Apr 2020 21:18:37 +0100
From:   Wei Liu <wei.liu@...nel.org>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, mikelley@...rosoft.com,
        vkuznets@...hat.com, stable@...r.kernel.org
Subject: Re: [PATCH v3] Drivers: hv: vmbus: Fix Suspend-to-Idle for
 Generation-2 VM

On Sat, Apr 11, 2020 at 08:50:35PM -0700, Dexuan Cui wrote:
> Before the hibernation patchset (e.g. f53335e3289f), in a Generation-2
> Linux VM on Hyper-V, the user can run "echo freeze > /sys/power/state" to
> freeze the system, i.e. Suspend-to-Idle. The user can press the keyboard
> or move the mouse to wake up the VM.
> 
> With the hibernation patchset, Linux VM on Hyper-V can hibernate to disk,
> but Suspend-to-Idle is broken: when the synthetic keyboard/mouse are
> suspended, there is no way to wake up the VM.
> 
> Fix the issue by not suspending and resuming the vmbus devices upon
> Suspend-to-Idle.
> 
> Fixes: f53335e3289f ("Drivers: hv: vmbus: Suspend/resume the vmbus itself for hibernation")
> Cc: stable@...r.kernel.org
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>

Applied to hyperv-fixes. Thanks.

Wei.