linux-kernel - Re: [PATCH V4 6/6] x86/Hyper-V: Report crash data in die() when panic_on

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Message-ID: <20200409164054.72es2ykmbef3jbui@debian>
Date:   Thu, 9 Apr 2020 17:40:54 +0100
From:   Wei Liu <wei.liu@...nel.org>
To:     Michael Kelley <mikelley@...rosoft.com>
Cc:     "ltykernel@...il.com" <ltykernel@...il.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <liuwe@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>, "hpa@...or.com" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>, "arnd@...db.de" <arnd@...db.de>,
        Tianyu Lan <Tianyu.Lan@...rosoft.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
        vkuznets <vkuznets@...hat.com>, Wei Liu <wei.liu@...nel.org>
Subject: Re: [PATCH V4 6/6] x86/Hyper-V: Report crash data in die() when
 panic_on_oops is set

On Wed, Apr 08, 2020 at 08:19:47PM +0000, Michael Kelley wrote:
> From: Tianyu Lan <Tianyu.Lan@...rosoft.com> Sent: Monday, April 6, 2020 8:54 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. Check panic_on_oops
> > and return directly in hyperv_report_panic() when the function
> > is called in the die() and panic_on_oops is unset. Fix it.
> > 
> > Fixes: 7ed4325a44ea ("Drivers: hv: vmbus: Make panic reporting to be more useful")
> > Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> > ---
> > Change since v3:
> > 	- Fix compile error.
> >         - Add fix commit in the change log
> > ---
> >  arch/x86/hyperv/hv_init.c      | 6 +++++-
> >  drivers/hv/vmbus_drv.c         | 5 +++--
> >  include/asm-generic/mshyperv.h | 2 +-
> >  3 files changed, 9 insertions(+), 4 deletions(-)
> 
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>

It seems to me only the last patch is new, others are already in my
tree, so I only apply the last one.

Let me know if my understanding is wrong.

Wei.