From: Michael Kelley <mikelley@microsoft.com>
To: "ltykernel@gmail.com" <ltykernel@gmail.com>,
KY Srinivasan <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Stephen Hemminger <sthemmin@microsoft.com>,
Wei Liu <liuwe@microsoft.com>
Cc: Tianyu Lan <Tianyu.Lan@microsoft.com>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
vkuznets <vkuznets@redhat.com>
Subject: RE: [PATCH V4 6/6] x86/Hyper-V: Report crash data in die() when panic_on_oops is set
Date: Tue, 31 Mar 2020 13:51:48 +0000 [thread overview]
Message-ID: <MW2PR2101MB1052A8FEF85F381B3EAF7D36D7C80@MW2PR2101MB1052.namprd21.prod.outlook.com> (raw)
In-Reply-To: <20200331073832.12204-1-Tianyu.Lan@microsoft.com>
From: Tianyu Lan <Tianyu.Lan@microsoft.com> Sent: Tuesday, March 31, 2020 12:39 AM
>
> 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.
>
> Reviewed-by: Michael Kelley <mikelley@microsoft.com>
> Signed-off-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
> ---
> Change since v3:
> Fix compile error
> ---
> drivers/hv/vmbus_drv.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index 172ceae69abb..4bc02aea2098 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -31,6 +31,7 @@
> #include <linux/kdebug.h>
> #include <linux/efi.h>
> #include <linux/random.h>
> +#include <linux/kernel.h>
Unfortunately, adding the #include doesn't solve the problem. The error occurs when
CONFIG_HYPERV=m, because panic_on_oops is not exported. I haven't thought it
through, but hopefully there's a solution where panic_on_oops can be tested in
hyperv_report_panic() or some other Hyper-V specific function that's never in a
module, so that we don't need to export panic_on_oops.
Michael
> #include <linux/syscore_ops.h>
> #include <clocksource/hyperv_timer.h>
> #include "hyperv_vmbus.h"
> @@ -91,7 +92,7 @@ static int hyperv_die_event(struct notifier_block *nb, unsigned long
> val,
> * doing hyperv_report_panic_msg() later with kmsg data, don't do
> * the notification here.
> */
> - if (hyperv_report_reg())
> + if (hyperv_report_reg() && panic_on_oops)
> hyperv_report_panic(regs, val);
> return NOTIFY_DONE;
> }
> --
> 2.14.5
next prev parent reply other threads:[~2020-03-31 13:51 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-24 7:57 [PATCH V3 0/6] x86/Hyper-V: Panic code path fixes ltykernel
2020-03-24 7:57 ` [PATCH V3 1/6] x86/Hyper-V: Unload vmbus channel in hv panic callback ltykernel
2020-03-25 18:28 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 2/6] x86/Hyper-V: Free hv_panic_page when fail to register kmsg dump ltykernel
2020-03-25 18:30 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 3/6] x86/Hyper-V: Trigger crash enlightenment only once during system crash ltykernel
2020-03-25 18:31 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg before running crash kernel ltykernel
2020-03-25 18:33 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 5/6] x86/Hyper-V: Report crash register data when sysctl_record_panic_msg is not set ltykernel
2020-03-25 18:34 ` Michael Kelley
2020-03-24 7:57 ` [PATCH V3 6/6] x86/Hyper-V: Report crash data in die() when panic_on_oops is set ltykernel
2020-03-25 18:36 ` Michael Kelley
2020-03-31 7:38 ` [PATCH V4 " ltykernel
2020-03-31 13:51 ` Michael Kelley [this message]
2020-03-31 14:26 ` Tianyu Lan
2020-04-01 18:53 ` Wei Liu
2020-04-02 12:51 ` Tianyu Lan
2020-03-30 10:13 ` [PATCH V3 0/6] x86/Hyper-V: Panic code path fixes Wei Liu
2020-04-06 15:53 [PATCH V4 " ltykernel
2020-04-06 15:53 ` [PATCH V4 6/6] x86/Hyper-V: Report crash data in die() when panic_on_oops is set ltykernel
2020-04-08 20:19 ` Michael Kelley
2020-04-09 16:40 ` Wei Liu
2020-04-09 23:06 ` Michael Kelley
2020-04-10 14:27 ` Wei Liu
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