Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933263AbbFWNbm (ORCPT ); Tue, 23 Jun 2015 09:31:42 -0400 Received: from casper.infradead.org ([85.118.1.10]:57679 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752229AbbFWNbf (ORCPT ); Tue, 23 Jun 2015 09:31:35 -0400 Message-ID: <1435066290.12045.2.camel@infradead.org> Subject: Re: [PATCH 00/19] Fix Intel IOMMU breakage in kdump kernel From: David Woodhouse To: Joerg Roedel , iommu@lists.linux-foundation.org Cc: zhen-hual@hp.com, bhe@redhat.com, ddutile@redhat.com, alex.williamson@redhat.com, dyoung@redhat.com, linux-kernel@vger.kernel.org, jroedel@8bytes.org Date: Tue, 23 Jun 2015 14:31:30 +0100 In-Reply-To: <1434178047-17809-1-git-send-email-joro@8bytes.org> References: <1434178047-17809-1-git-send-email-joro@8bytes.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-C1YF75NAcSnh2MFyPRf6" X-Mailer: Evolution 3.16.3 (3.16.3-2.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: 9472 Lines: 153 --=-C1YF75NAcSnh2MFyPRf6 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2015-06-13 at 08:47 +0200, Joerg Roedel wrote: > Hi, >=20 > as David Woodhouse pointed out, my fixes and cleanups for > the original patch-set turned out to be a complete rewrite. > So to have a cleaner history of the feature and to make > backporting easier, here is a rewrite of my changes based on > v4.1-rc7. >=20 > Some additional issues have been fixed by this rewrite, like > a kdump-kernel boot panic with 'iommu=3Dpt' and support for > copying the extended root-entry and context table formats > has been added. This looks much better than before; thanks. However, it's still fairly gratuitous for all non-broken hardware, and will tend to hide hardware and driver bugs during testing of new hardware. I'd much rather see this limited to a blacklist of known-broken devices, an accompanied by a kernel message along the lines of 'Preserving VT-d page tables for broken HP device xxxx:xxxx' For *any* device which isn't so broken that it craps itself on taking a DMA fault and cannot be reset, this page table copy shouldn't be needed, right? --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-C1YF75NAcSnh2MFyPRf6 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIISjjCCBicw ggUPoAMCAQICAw3vNzANBgkqhkiG9w0BAQUFADCBjDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0 YXJ0Q29tIEx0ZC4xKzApBgNVBAsTIlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcx ODA2BgNVBAMTL1N0YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgQ2xpZW50IENB MB4XDTE1MDUwNTA5NDM0MVoXDTE2MDUwNTA5NTMzNlowQjEcMBoGA1UEAwwTZHdtdzJAaW5mcmFk 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