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Wed, 25 Mar 2020 18:33:26 +0000 From: Michael Kelley To: "ltykernel@gmail.com" , KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Wei Liu , "tglx@linutronix.de" , "mingo@redhat.com" , "bp@alien8.de" , "hpa@zytor.com" , "x86@kernel.org" CC: Tianyu Lan , "linux-hyperv@vger.kernel.org" , "linux-kernel@vger.kernel.org" , vkuznets Subject: RE: [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg before running crash kernel Thread-Topic: [PATCH V3 4/6] x86/Hyper-V: Report crash register data or ksmg before running crash kernel Thread-Index: AQHWAbHkWZSdft85wU2lQwThbXev46hZo9qg Date: Wed, 25 Mar 2020 18:33:26 +0000 Message-ID: References: <20200324075720.9462-1-Tianyu.Lan@microsoft.com> <20200324075720.9462-5-Tianyu.Lan@microsoft.com> In-Reply-To: <20200324075720.9462-5-Tianyu.Lan@microsoft.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: msip_labels: MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=True; MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 294f24cb-53a5-4980-9071-08d7d0eb0233 X-MS-Exchange-CrossTenant-originalarrivaltime: 25 Mar 2020 18:33:26.6881 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: 7yGea54uFC25Pw2mfeRhWmR8BfezNcqihedD520KIKofVckf/fEPKhriAKMw8oRVcss0DFe03rExJrZiaOJmUqADE0hF7JDIy2DbzeVh8hg= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW2PR2101MB1098 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tianyu Lan Sent: Tuesday, March 24, 2020 1= 2:57 AM >=20 > 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. >=20 > Signed-off-by: Tianyu Lan > --- > Change since v1: > Update commit log > --- > arch/x86/kernel/cpu/mshyperv.c | 10 ++++++++++ > 1 file changed, 10 insertions(+) >=20 Reviewed-by: Michael Kelley