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Message-Id: <1310752065-27895-113-git-send-email-kys@microsoft.com>
Date: Fri, 15 Jul 2011 10:47:41 -0700
From: "K. Y. Srinivasan" <kys@...rosoft.com>
To: gregkh@...e.de, linux-kernel@...r.kernel.org,
devel@...uxdriverproject.org, virtualization@...ts.osdl.org
Cc: "K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>
Subject: [PATCH 113/117] Staging: hv: util: Adjust guest time in a process context
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@...rosoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.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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