Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756864AbaDHQPP (ORCPT ); Tue, 8 Apr 2014 12:15:15 -0400 Received: from casper.infradead.org ([85.118.1.10]:57766 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756329AbaDHQPO (ORCPT ); Tue, 8 Apr 2014 12:15:14 -0400 Message-ID: <1396973686.25235.36.camel@i7.infradead.org> Subject: Re: [PATCHv3 0/6] Crashdump Accepting Active IOMMU From: David Woodhouse To: Don Dutile Cc: Bill Sumner , indou.takao@jp.fujitsu.com, bhe@redhat.com, joro@8bytes.org, iommu@lists.linux-foundation.org, kexec@lists.infradead.org, alex.williamson@redhat.com, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, ishii.hironobu@jp.fujitsu.com, bhelgaas@google.com, doug.hatch@hp.com, zhenhua@hp.com Date: Tue, 08 Apr 2014 17:14:46 +0100 In-Reply-To: <53430DE9.9080303@redhat.com> References: <1389391652-52422-1-git-send-email-bill.sumner@hp.com> <53430DE9.9080303@redhat.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-sXSsxPiElqo9xTwDotR7" X-Mailer: Evolution 3.10.4 (3.10.4-2.fc20) 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 --=-sXSsxPiElqo9xTwDotR7 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2014-04-07 at 16:43 -0400, Don Dutile wrote: >=20 > Additionally, a tidbit of information like "some servers force NMI's > on DMAR faults, > and cause a system reset, thereby, preventing a kdump to occur" > should have been included as one reason to stop DMAR faults from > occurring on kexec-boot, > in addition to the fact that a flood of them can lock up a system. How about allocating a physical scratch page, and setting up a mapping for each device such that *every* virtual address (apart from those listed in RMRRs, perhaps) is mapped to that same scratch page? That way you avoid the faults, but you also avoid stray DMA to parts of the system that you don't want to get corrupted. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-sXSsxPiElqo9xTwDotR7 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISxDCCBjQw ggQcoAMCAQICAR4wDQYJKoZIhvcNAQEFBQAwfTELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0 Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxKTAn BgNVBAMTIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5MB4XDTA3MTAyNDIxMDE1NVoX DTE3MTAyNDIxMDE1NVowgYwxCzAJBgNVBAYTAklMMRYwFAYDVQQKEw1TdGFydENvbSBMdGQuMSsw KQYDVQQLEyJTZWN1cmUgRGlnaXRhbCBDZXJ0aWZpY2F0ZSBTaWduaW5nMTgwNgYDVQQDEy9TdGFy dENvbSBDbGFzcyAxIFByaW1hcnkgSW50ZXJtZWRpYXRlIENsaWVudCBDQTCCASIwDQYJKoZIhvcN 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