Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753156AbbFHOPp (ORCPT ); Mon, 8 Jun 2015 10:15:45 -0400 Received: from casper.infradead.org ([85.118.1.10]:43176 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752689AbbFHOPm (ORCPT ); Mon, 8 Jun 2015 10:15:42 -0400 Message-ID: <1433772935.2952.47.camel@infradead.org> Subject: Re: [PATCH v11 04/10] iommu/vt-d: functions to copy data from old mem 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 15:15:35 +0100 In-Reply-To: <1431337974-545-5-git-send-email-zhen-hual@hp.com> References: <1431337974-545-1-git-send-email-zhen-hual@hp.com> <1431337974-545-5-git-send-email-zhen-hual@hp.com> Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-XzKMuclTynvH65kZCcVX" 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: 9266 Lines: 148 --=-XzKMuclTynvH65kZCcVX 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: > Add some functions to copy the data from old kernel. > These functions are used to copy context tables and page tables. >=20 > To avoid calling iounmap between spin_lock_irqsave and=20 > spin_unlock_irqrestore, > use a link here, store the pointers , and then use iounmap to free=20 > them in > another place. >=20 > Li, Zhen-hua: > The functions and logics. 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 kexe= c support code? Don't we need to solve the same kexec problem on *all* platforms with an IOMMU, and won't they all need something like this? And I think you're misusing VTD_PAGE_{SHIFT,MASK} when you should be using the normal PAGE_{SHIFT,MASK}. And shouldn't physical addresses be phys_addr_t? --=20 David Woodhouse Open Source Technology Centre David.Woodhouse@intel.com Intel Corporation --=-XzKMuclTynvH65kZCcVX 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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