linux-kernel - [PATCH V2 6/6] x86/Hyper-V: Report crash data in die() when panic_on

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Message-Id: <20200323130924.2968-7-Tianyu.Lan@microsoft.com>
Date:   Mon, 23 Mar 2020 06:09:24 -0700
From:   ltykernel@...il.com
To:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        liuwe@...rosoft.com, michael.h.kelley@...rosoft.com
Cc:     Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        vkuznets@...hat.com
Subject: [PATCH V2 6/6] x86/Hyper-V: Report crash data in die() when panic_on_oops is set

From: Tianyu Lan <Tianyu.Lan@...rosoft.com>

When oops happens with panic_on_oops unset, the oops
thread is killed by die() and system continues to run.
In such case, guest should not report crash register
data to host since system still runs. Fix it.

Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
---
 drivers/hv/vmbus_drv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 00447175c040..ecdb64db0e4a 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -89,7 +89,7 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long val,
 	 * Crash notify only can be triggered once. If crash notify
 	 * message is available, just report kmsg to crash buffer.
 	 */
-	if (hyperv_report_reg())
+	if (hyperv_report_reg() && panic_on_oops)
 		hyperv_report_panic(regs, val);
 	return NOTIFY_DONE;
 }
-- 
2.14.5