Thread (175 messages) 175 messages, 9 authors, 2011-08-25
STALE5392d

[PATCH 113/117] Staging: hv: util: Adjust guest time in a process context

From: "K. Y. Srinivasan" <kys@microsoft.com>
Date: 2011-07-15 17:30:22
Also in: lkml
Subsystem: staging subsystem, the rest · Maintainers: Greg Kroah-Hartman, Linus Torvalds

The current code was adjusting guest time in interrupt context; do this
in process context since we may have to initiate cross-processor
interrupts as part of setting time.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
---
 drivers/staging/hv/hv_util.c |   30 ++++++++++++++++++++++++++++--
 1 files changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/hv/hv_util.c b/drivers/staging/hv/hv_util.c
index 070e61f..d3fb017 100644
--- a/drivers/staging/hv/hv_util.c
+++ b/drivers/staging/hv/hv_util.c
@@ -109,6 +109,24 @@ static inline void do_adj_guesttime(u64 hosttime)
 }
 
 /*
+ * Set the host time in a process context.
+ */
+
+struct adj_time_work {
+	struct work_struct work;
+	u64	host_time;
+};
+
+static void hv_set_host_time(struct work_struct *work)
+{
+	struct adj_time_work	*wrk;
+
+	wrk = container_of(work, struct adj_time_work, work);
+	do_adj_guesttime(wrk->host_time);
+	kfree(wrk);
+}
+
+/*
  * Synchronize time with host after reboot, restore, etc.
  *
  * ICTIMESYNCFLAG_SYNC flag bit indicates reboot, restore events of the VM.
@@ -121,16 +139,24 @@ static inline void do_adj_guesttime(u64 hosttime)
  */
 static inline void adj_guesttime(u64 hosttime, u8 flags)
 {
+	struct adj_time_work    *wrk;
 	static s32 scnt = 50;
 
+	wrk = kmalloc(sizeof(struct adj_time_work), GFP_ATOMIC);
+	if (wrk == NULL)
+		return;
+
+	wrk->host_time = hosttime;
 	if ((flags & ICTIMESYNCFLAG_SYNC) != 0) {
-		do_adj_guesttime(hosttime);
+		INIT_WORK(&wrk->work, hv_set_host_time);
+		schedule_work(&wrk->work);
 		return;
 	}
 
 	if ((flags & ICTIMESYNCFLAG_SAMPLE) != 0 && scnt > 0) {
 		scnt--;
-		do_adj_guesttime(hosttime);
+		INIT_WORK(&wrk->work, hv_set_host_time);
+		schedule_work(&wrk->work);
 	}
 }
 
-- 
1.7.4.1
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