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From:   Dexuan Cui <decui@microsoft.com>
To:     KY Srinivasan <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        "sashal@kernel.org" <sashal@kernel.org>,
        Sasha Levin <Alexander.Levin@microsoft.com>,
        "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
        Michael Kelley <mikelley@microsoft.com>,
        vkuznets <vkuznets@redhat.com>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: [PATCH v2 2/4] hv_utils: Support host-initiated restart request
Thread-Topic: [PATCH v2 2/4] hv_utils: Support host-initiated restart request
Thread-Index: AdXJ2v+CkGXQwSJARV+SWgYtZDG50A==
Date:   Mon, 13 Jan 2020 06:30:58 +0000
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To test the code, run this command on the host:

Restart-VM $vm -Type Reboot

Signed-off-by: Dexuan Cui <decui@microsoft.com>
---
 drivers/hv/hv_util.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/drivers/hv/hv_util.c b/drivers/hv/hv_util.c
index 766bd8457346..fe3a316380c2 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -24,6 +24,8 @@
=20
 #define SD_MAJOR	3
 #define SD_MINOR	0
+#define SD_MINOR_1	1
+#define SD_VERSION_3_1	(SD_MAJOR << 16 | SD_MINOR_1)
 #define SD_VERSION	(SD_MAJOR << 16 | SD_MINOR)
=20
 #define SD_MAJOR_1	1
@@ -50,8 +52,9 @@ static int sd_srv_version;
 static int ts_srv_version;
 static int hb_srv_version;
=20
-#define SD_VER_COUNT 2
+#define SD_VER_COUNT 3
 static const int sd_versions[] =3D {
+	SD_VERSION_3_1,
 	SD_VERSION,
 	SD_VERSION_1
 };
@@ -118,11 +121,21 @@ static void perform_shutdown(struct work_struct *dumm=
y)
 	orderly_poweroff(true);
 }
=20
+static void perform_restart(struct work_struct *dummy)
+{
+	orderly_reboot();
+}
+
 /*
  * Perform the shutdown operation in a thread context.
  */
 static DECLARE_WORK(shutdown_work, perform_shutdown);
=20
+/*
+ * Perform the restart operation in a thread context.
+ */
+static DECLARE_WORK(restart_work, perform_restart);
+
 static void shutdown_onchannelcallback(void *context)
 {
 	struct vmbus_channel *channel =3D context;
@@ -166,6 +179,14 @@ static void shutdown_onchannelcallback(void *context)
 				pr_info("Shutdown request received -"
 					    " graceful shutdown initiated\n");
 				break;
+			case 2:
+			case 3:
+				pr_info("Restart request received -"
+					    " graceful restart initiated\n");
+				icmsghdrp->status =3D HV_S_OK;
+
+				schedule_work(&restart_work);
+				break;
 			default:
 				icmsghdrp->status =3D HV_E_FAIL;
 				execute_shutdown =3D false;
--=20
2.19.1