linux-kernel - [PATCH 3/3] hv_utils: Support host-initiated restart request

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Date:   Wed, 11 Sep 2019 23:39:00 +0000
From:   Dexuan Cui <decui@...rosoft.com>
To:     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>,
        Michael Kelley <mikelley@...rosoft.com>
CC:     Dexuan Cui <decui@...rosoft.com>
Subject: [PATCH 3/3] hv_utils: Support host-initiated restart request

To test the code, we should run this command on the host:

Restart-VM $vm -Type Reboot

Signed-off-by: Dexuan Cui <decui@...rosoft.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 9e98c5d..6d642f5 100644
--- a/drivers/hv/hv_util.c
+++ b/drivers/hv/hv_util.c
@@ -24,7 +24,9 @@
 
 #define SD_MAJOR	3
 #define SD_MINOR	0
+#define SD_MINOR_1	1
 #define SD_MINOR_2	2
+#define SD_VERSION_3_1	(SD_MAJOR << 16 | SD_MINOR_1)
 #define SD_VERSION_3_2	(SD_MAJOR << 16 | SD_MINOR_2)
 #define SD_VERSION	(SD_MAJOR << 16 | SD_MINOR)
 
@@ -52,9 +54,10 @@
 static int ts_srv_version;
 static int hb_srv_version;
 
-#define SD_VER_COUNT 3
+#define SD_VER_COUNT 4
 static const int sd_versions[] = {
 	SD_VERSION_3_2,
+	SD_VERSION_3_1,
 	SD_VERSION,
 	SD_VERSION_1
 };
@@ -147,6 +150,11 @@ static void perform_shutdown(struct work_struct *dummy)
 	orderly_poweroff(true);
 }
 
+static void perform_restart(struct work_struct *dummy)
+{
+	orderly_reboot();
+}
+
 static void perform_hibernation(struct work_struct *dummy)
 {
 	/*
@@ -175,6 +183,11 @@ static void perform_hibernation(struct work_struct *dummy)
 static DECLARE_WORK(shutdown_work, perform_shutdown);
 
 /*
+ * Perform the restart operation in a thread context.
+ */
+static DECLARE_WORK(restart_work, perform_restart);
+
+/*
  * Perform the hibernation operation in a thread context.
  */
 static DECLARE_WORK(hibernate_work, perform_hibernation);
@@ -222,6 +235,14 @@ 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 = HV_S_OK;
+
+				schedule_work(&restart_work);
+				break;
 			case 4:
 			case 5:
 				pr_info("Hibernation request received -"
-- 
1.8.3.1