From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753147AbbFKPkT (ORCPT ); Thu, 11 Jun 2015 11:40:19 -0400 Received: from casper.infradead.org ([85.118.1.10]:41021 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752391AbbFKPkR (ORCPT ); Thu, 11 Jun 2015 11:40:17 -0400 Message-ID: <1434037212.3907.82.camel@infradead.org> Subject: Re: [PATCH v10 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel From: David Woodhouse To: "Li, Zhen-Hua" Cc: indou.takao@jp.fujitsu.com, bhe@redhat.com, joro@8bytes.org, vgoyal@redhat.com, dyoung@redhat.com, tom.vaden@hp.com, rwright@hp.com, linux-pci@vger.kernel.org, kexec@lists.infradead.org, iommu@lists.linux-foundation.org, lisa.mitchell@hp.com, linux-kernel@vger.kernel.org, doug.hatch@hp.com, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, billsumnerlinux@gmail.com, li.zhang6@hp.com Date: Thu, 11 Jun 2015 16:40:12 +0100 In-Reply-To: <1428655333-19504-1-git-send-email-zhen-hual@hp.com> References: <1428655333-19504-1-git-send-email-zhen-hual@hp.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-lDByxYIZC/Ch3KSraFDH" X-Mailer: Evolution 3.16.2.1 (3.16.2.1-2.fc22) Mime-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-lDByxYIZC/Ch3KSraFDH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-04-10 at 16:42 +0800, Li, Zhen-Hua wrote: > This patchset is an update of Bill Sumner's patchset, implements a fix fo= r: > If a kernel boots with intel_iommu=3Don on a system that supports intel v= t-d,=20 > when a panic happens, the kdump kernel will boot with these faults: But, in the general case, it *does* boot. There are two cases where it doesn't actually boot, and those are the interesting ones. Firstly, a device just keeps generating faults and we die in an interrupt storm, reporting the same fault over and over again. That can actually happen without kdump/kexec and the correct fix for that is to have rate-limiting, disable fault reporting for the offending device after too many are seen, and then eventually to tie it in to the PCIe error handling as has been discussed elsewhere. Secondly, there are devices which do not correctly respond to a hardware reset. This is broken hardware, and if we really have to copy the old contexts from the crashed kernel to work around it then I'd like it to be on a blacklist basis =E2=80=94 we do it only for hardware whi= ch is *known* to be broken in this way. (There's also some cases where the device driver doesn't even *try* to reset the hardware and just assumes it'll find it in a sane state as the BIOS or a cleanly shut down kexec would have left it. In those cases of course we can just fix the driver). I don't much like the idea of doing this context copy for *all* hardware. That's masking hardware issues with reset that we really *ought* to be finding. I believe that most of the offending hardware is HP's; they like to do the most, erm, "interesting" things with odd hardware and RMRRs and stuff. So Zhen-Hua would you be able to provide the list of broken devices that HP has shipped, for the purpose of such a blacklist? I assume you've already contacted the hardware folks responsible and insisted that their devices are fixed to be resettable already, right? --=20 dwmw2 --=-lDByxYIZC/Ch3KSraFDH Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG 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AD6uz4TTwGVzyCmimflus11qmcletfknQswv3be1AFRq+JpXtgU/j0OdAAAAAAAA --=-lDByxYIZC/Ch3KSraFDH-- From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Message-ID: <1434037212.3907.82.camel@infradead.org> Subject: Re: [PATCH v10 0/10] iommu/vt-d: Fix intel vt-d faults in kdump kernel From: David Woodhouse Date: Thu, 11 Jun 2015 16:40:12 +0100 In-Reply-To: <1428655333-19504-1-git-send-email-zhen-hual@hp.com> References: <1428655333-19504-1-git-send-email-zhen-hual@hp.com> Mime-Version: 1.0 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============5595223466954579012==" Sender: "kexec" Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: "Li, Zhen-Hua" Cc: indou.takao@jp.fujitsu.com, bhe@redhat.com, tom.vaden@hp.com, rwright@hp.com, linux-pci@vger.kernel.org, joro@8bytes.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, lisa.mitchell@hp.com, iommu@lists.linux-foundation.org, doug.hatch@hp.com, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, billsumnerlinux@gmail.com, li.zhang6@hp.com, dyoung@redhat.com, vgoyal@redhat.com --===============5595223466954579012== Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-lDByxYIZC/Ch3KSraFDH" --=-lDByxYIZC/Ch3KSraFDH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2015-04-10 at 16:42 +0800, Li, Zhen-Hua wrote: > This patchset is an update of Bill Sumner's patchset, implements a fix fo= r: > If a kernel boots with intel_iommu=3Don on a system that supports intel v= t-d,=20 > when a panic happens, the kdump kernel will boot with these faults: But, in the general case, it *does* boot. There are two cases where it doesn't actually boot, and those are the interesting ones. Firstly, a device just keeps generating faults and we die in an interrupt storm, reporting the same fault over and over again. That can actually happen without kdump/kexec and the correct fix for that is to have rate-limiting, disable fault reporting for the offending device after too many are seen, and then eventually to tie it in to the PCIe error handling as has been discussed elsewhere. Secondly, there are devices which do not correctly respond to a hardware reset. This is broken hardware, and if we really have to copy the old contexts from the crashed kernel to work around it then I'd like it to be on a blacklist basis =E2=80=94 we do it only for hardware whi= ch is *known* to be broken in this way. (There's also some cases where the device driver doesn't even *try* to reset the hardware and just assumes it'll find it in a sane state as the BIOS or a cleanly shut down kexec would have left it. In those cases of course we can just fix the driver). I don't much like the idea of doing this context copy for *all* hardware. That's masking hardware issues with reset that we really *ought* to be finding. I believe that most of the offending hardware is HP's; they like to do the most, erm, "interesting" things with odd hardware and RMRRs and stuff. So Zhen-Hua would you be able to provide the list of broken devices that HP has shipped, for the purpose of such a blacklist? I assume you've already contacted the hardware folks responsible and insisted that their devices are fixed to be resettable already, right? --=20 dwmw2 --=-lDByxYIZC/Ch3KSraFDH Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk ZWFkLm9yZzEiMCAGCSqGSIb3DQEJARYTZHdtdzJAaW5mcmFkZWFkLm9yZzCCASIwDQYJKoZIhvcN AQEBBQADggEPADCCAQoCggEBAMkbm9kPbx1j/X4RVyf/pPKSYwelcco69TvnQQbKM8m8xkWjXJI1 jpJ1jMaGUZGFToINMSZi7lZawUozudWbXSKy1SikENSTJHffsdRAIlsp+hR8vWvjsKUry6sEdqPG 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