Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752997AbbFHO0l (ORCPT ); Mon, 8 Jun 2015 10:26:41 -0400 Received: from casper.infradead.org ([85.118.1.10]:43283 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752716AbbFHO03 (ORCPT ); Mon, 8 Jun 2015 10:26:29 -0400 Message-ID: <1433773583.2952.52.camel@infradead.org> Subject: Re: [PATCH v11 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, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, kexec@lists.infradead.org, alex.williamson@redhat.com, ddutile@redhat.com, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, doug.hatch@hp.com, jerry.hoemann@hp.com, tom.vaden@hp.com, li.zhang6@hp.com, lisa.mitchell@hp.com, billsumnerlinux@gmail.com, rwright@hp.com Date: Mon, 08 Jun 2015 15:26:23 +0100 In-Reply-To: <1431337974-545-1-git-send-email-zhen-hual@hp.com> References: <1431337974-545-1-git-send-email-zhen-hual@hp.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-siEst4SHcAKD8uC4iZY8" 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 Content-Length: 9869 Lines: 159 --=-siEst4SHcAKD8uC4iZY8 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2015-05-11 at 17:52 +0800, Li, Zhen-Hua wrote: > To fix this problem, we modifies the behaviors of the intel vt-d in the= =20 > crashdump kernel: >=20 > For DMA Remapping: > 1. To accept the vt-d hardware in an active state, > 2. Do not disable and re-enable the translation, keep it enabled. > 3. Use the old root entry table, do not rewrite the RTA register. > 4. Malloc and use new context entry table, copy data from the old ones th= at > used by the old kernel. There are some interesting corner cases to handle here. Firstly, you don't seem to handle the case of extended root/context tables (where ecap_ecs is set). You need to preserve the DMA_RTADDR_RT bit in the Root Table Address register, surely? I think we also need to cope with inheriting page tables from a kernel that *doesn't* use extended page tables, even on hardware that supports it. Which means the use of extended page tables in the new kernel would need to be contingent on something *other* than the pure hardware capabilities. > 5. Keep using the old page tables before driver is loaded. > 6. After device driver is loaded, when it issues the first dma_map comman= d,=20 > free the dmar_domain structure for this device, and generate a new one= , so=20 > that the device can be assigned a new and empty page table.=20 What if there were RMRRs for this device? Don't we need to ensure that those are present in the "new and empty page table" when we take it over? --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-siEst4SHcAKD8uC4iZY8 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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