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Mon, 7 Sep 2020 06:30:48 +0000 From: Dexuan Cui To: Thomas Gleixner , "mingo@redhat.com" , "rdunlap@infradead.org" , "bp@alien8.de" , "hpa@zytor.com" , "x86@kernel.org" , "peterz@infradead.org" , "allison@lohutok.net" , "alexios.zavras@intel.com" , "gregkh@linuxfoundation.org" , "namit@vmware.com" , Michael Kelley , Long Li CC: "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" Subject: RE: [RESEND][PATCH v3] x86/apic/flat64: Add back the early_param("apic", parse_apic) Thread-Topic: [RESEND][PATCH v3] x86/apic/flat64: Add back the early_param("apic", parse_apic) Thread-Index: AQHWXDqcBL16zQ0AeEGLYyUOD3kNpalccIfQ Date: Mon, 7 Sep 2020 06:30:47 +0000 Message-ID: References: <20200626182106.57219-1-decui@microsoft.com> <87mu3ys391.fsf@nanos.tec.linutronix.de> In-Reply-To: <87mu3ys391.fsf@nanos.tec.linutronix.de> 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_ActionId=9a8210d2-6baa-4293-a33a-cc8a3a861df6;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_ContentBits=0;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Enabled=true;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Method=Standard;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_Name=Internal;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SetDate=2020-09-06T21:27:16Z;MSIP_Label_f42aa342-8706-4288-bd11-ebb85995028c_SiteId=72f988bf-86f1-41af-91ab-2d7cd011db47; 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Thank you tglx for the c= omments and suggestions, which I think are reasonable. I realized this patch is pro= blematic. The good news is that the LAPIC emulation bug has been fixed in the latest = version of Hyper-V and now kdump can work reliably. I think the hypervisor fix woul= d be=20 backported to old Hyper-V versions, so hopefully this won't be an issue ove= r time. Thanks, -- Dexuan