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

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Message-ID: <MW2PR2101MB10524CB8CBF3FE49C2EDAA8DD7C00@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Wed, 8 Apr 2020 20:19:47 +0000
From:   Michael Kelley <mikelley@...rosoft.com>
To:     "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>
CC:     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>
Subject: RE: [PATCH V4 6/6] x86/Hyper-V: Report crash data in die() when
 panic_on_oops is set

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>