linux-kernel - RE: [PATCH v4 3/4] hv_utils: Support host-initiated hibernation request

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Message-ID: <MW2PR2101MB10520551E6D09AC561E512AAD7080@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Sun, 26 Jan 2020 06:08:21 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        vkuznets <vkuznets@...hat.com>
Subject: RE: [PATCH v4 3/4] hv_utils: Support host-initiated hibernation
 request

From: Dexuan Cui <decui@...rosoft.com> Sent: Saturday, January 25, 2020 9:50 PM
> 
> Update the Shutdown IC version to 3.2, which is required for the host to
> send the hibernation request.
> 
> The user is expected to create the below udev rule file, which is applied
> upon the host-initiated hibernation request:
> 
> root@...alhost:~# cat /usr/lib/udev/rules.d/40-vm-hibernation.rules
> SUBSYSTEM=="vmbus", ACTION=="change", DRIVER=="hv_utils",
> ENV{EVENT}=="hibernate", RUN+="/usr/bin/systemctl hibernate"
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> 
> ---
> Changes in v2:
>     Send the host-initiated hibernation request to the user space via udev.
>     (v1 used call_usermodehelper() and "/sbin/hyperv-hibernate".)
> 
> Changes in v3 (I addressed Michael's comoments):
>     Fixed the order issue in sd_versions[].
>     Moved schedule_work() to a later place for consistency.
> 
> Changes in v4 (Thanks to Michael!):
>     Used a compact way to handle the work item.
> 
>  drivers/hv/hv_util.c | 49 +++++++++++++++++++++++++++++++++++++++++++-
>  1 file changed, 48 insertions(+), 1 deletion(-)
> 

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