linux-kernel - RE: [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg before running crash kernel

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Message-ID: <MW2PR2101MB1052302CA7C500F727DF6C92D7CE0@MW2PR2101MB1052.namprd21.prod.outlook.com>
Date:   Wed, 25 Mar 2020 18:33:26 +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>
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>,
        vkuznets <vkuznets@...hat.com>
Subject: RE: [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg
 before running crash kernel

From: Tianyu Lan <Tianyu.Lan@...rosoft.com> Sent: Tuesday, March 24, 2020 12:57 AM
> 
> We want to notify Hyper-V when a Linux guest VM crash occurs, so
> there is a record of the crash even when kdump is enabled.   But
> crash_kexec_post_notifiers defaults to "false", so the kdump kernel
> runs before the notifiers and Hyper-V never gets notified.  Fix this by
> always setting crash_kexec_post_notifiers to be true for Hyper-V VMs.
> 
> Signed-off-by: Tianyu Lan <Tianyu.Lan@...rosoft.com>
> ---
> Change since v1:
>        Update commit log
> ---
>  arch/x86/kernel/cpu/mshyperv.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>