Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752928AbbFHPoO (ORCPT ); Mon, 8 Jun 2015 11:44:14 -0400 Received: from casper.infradead.org ([85.118.1.10]:43814 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752355AbbFHPoJ (ORCPT ); Mon, 8 Jun 2015 11:44:09 -0400 Message-ID: <1433778242.2952.76.camel@infradead.org> Subject: Re: [PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem From: David Woodhouse To: Joerg Roedel Cc: "Li, Zhen-Hua" , indou.takao@jp.fujitsu.com, bhe@redhat.com, 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 16:44:02 +0100 In-Reply-To: <20150608152147.GV20384@8bytes.org> References: <1431337974-545-1-git-send-email-zhen-hual@hp.com> <1431337974-545-5-git-send-email-zhen-hual@hp.com> <1433772935.2952.47.camel@infradead.org> <20150608152147.GV20384@8bytes.org> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-0U2ifi1BApJCjGqxfXi2" 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: 10029 Lines: 164 --=-0U2ifi1BApJCjGqxfXi2 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2015-06-08 at 17:21 +0200, Joerg Roedel wrote: > Hi David, >=20 > On Mon, Jun 08, 2015 at 03:15:35PM +0100, David Woodhouse wrote: > > Surely this isn't specific to the Intel IOMMU? Shouldn't it live > > elsewhere =E2=80=94 either in generic IOMMU code or perhaps in generic = kexec > > support code? >=20 > I put a bigger rework of this on-top of Zhen-Hua's patches, you can find > the result in my x86/vt-d branch. With my patches I also removed this > pointer collecting concept and do the iomap_cache and iounmap calls > before the spin-lock is taken, so this problem is now solved > differently. >=20 > > And I think you're misusing VTD_PAGE_{SHIFT,MASK} when you should be > > using the normal PAGE_{SHIFT,MASK}. >=20 > I think VT_PAGE_* is correct, since the VT-d driver also runs on ia64. > There the system page-size is different from the VT-d page-size. That's the problem. In __iommu_load_from_oldmem we start with a physical address in 'from', convert to a VT-d PFN in 'pfn': + pfn =3D from >> VTD_PAGE_SHIFT; .. and then proceed to pass that pfn to non-VT-d functions like page_is_ram() and pfn_to_kaddr() which really need their input pfn values to be in terms of PAGE_SHIFT not VTD_PAGE_SHIFT. But it looks like you've completely eliminated that now (including the page_is_ram check). So although it *was* wrong, it doesn't matter now. > > And shouldn't physical addresses be phys_addr_t? >=20 > This is changed where appropriate, I hope. OK. In fact once it's purely internal to intel-iommu.c it doesn't matter as much since we don't put page tables in high memory on 32-bit machines. --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-0U2ifi1BApJCjGqxfXi2 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 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