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From:   Michael Kelley <mikelley@microsoft.com>
To:     Dexuan Cui <decui@microsoft.com>,
        KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "wei.liu@kernel.org" <wei.liu@kernel.org>,
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        vkuznets <vkuznets@redhat.com>
CC:     "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH v2] Drivers: hv: vmbus: Fix Suspend-to-Idle for
 Generation-2 VM
Thread-Topic: [PATCH v2] Drivers: hv: vmbus: Fix Suspend-to-Idle for
 Generation-2 VM
Thread-Index: AQHWD79fbnxkR6YcIUGt9U2cZJm+Yqh01nUQ
Date:   Sun, 12 Apr 2020 03:33:43 +0000
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References: <1586581684-113131-1-git-send-email-decui@microsoft.com>
In-Reply-To: <1586581684-113131-1-git-send-email-decui@microsoft.com>
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From: Dexuan Cui <decui@microsoft.com> Sent: Friday, April 10, 2020 10:08 P=
M
>=20
> 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.
>=20
> 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.
>=20
> Fix the issue by not suspending and resuming the vmbus devices upon
> Suspend-to-Idle.
>=20
> Fixes: f53335e3289f ("Drivers: hv: vmbus: Suspend/resume the vmbus itself=
 for
> hibernation")
> Cc: stable@vger.kernel.org
> Signed-off-by: Dexuan Cui <decui@microsoft.com>
> ---
>=20
> Changes in v2:
>     Added "#define vmbus_suspend NULL", etc. for the case where
> CONFIG_PM_SLEEP is not defined.
>     Many thanks to kbuild test robot <lkp@intel.com> for this!
>=20
>  drivers/hv/vmbus_drv.c | 43 ++++++++++++++++++++++++++++++++++---------
>  1 file changed, 34 insertions(+), 9 deletions(-)
>=20

Reviewed-by: Michael Kelley <mikelley@microsoft.com>