From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.9 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6157CC43215 for ; Fri, 15 Nov 2019 05:55:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A0FE20715 for ; Fri, 15 Nov 2019 05:55:19 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="UiL51t0e" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727756AbfKOFzS (ORCPT ); Fri, 15 Nov 2019 00:55:18 -0500 Received: from hqemgate16.nvidia.com ([216.228.121.65]:10743 "EHLO hqemgate16.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727481AbfKOFyC (ORCPT ); Fri, 15 Nov 2019 00:54:02 -0500 Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqemgate16.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Thu, 14 Nov 2019 21:53:46 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Thu, 14 Nov 2019 21:53:46 -0800 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Thu, 14 Nov 2019 21:53:46 -0800 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 15 Nov 2019 05:53:45 +0000 Received: from HQMAIL107.nvidia.com (172.20.187.13) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 15 Nov 2019 05:53:45 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Fri, 15 Nov 2019 05:53:45 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Thu, 14 Nov 2019 21:53:45 -0800 From: John Hubbard To: Andrew Morton CC: Al Viro , Alex Williamson , Benjamin Herrenschmidt , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , Christoph Hellwig , Dan Williams , Daniel Vetter , Dave Chinner , David Airlie , "David S . Miller" , Ira Weiny , Jan Kara , Jason Gunthorpe , Jens Axboe , Jonathan Corbet , =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Magnus Karlsson , "Mauro Carvalho Chehab" , Michael Ellerman , Michal Hocko , Mike Kravetz , "Paul Mackerras" , Shuah Khan , Vlastimil Babka , , , , , , , , , , , , , LKML , John Hubbard Subject: [PATCH v5 19/24] vfio, mm: pin_user_pages (FOLL_PIN) and put_user_page() conversion Date: Thu, 14 Nov 2019 21:53:35 -0800 Message-ID: <20191115055340.1825745-20-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191115055340.1825745-1-jhubbard@nvidia.com> References: <20191115055340.1825745-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1573797226; bh=nI3kBsm1YYmEZh4r0pGrnWMl68q+Rq4M7HG7pTJrYP4=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=UiL51t0eNbBdWE9uBI9yzZIoqGTugx4HY+QWVen5p/yEalMtSkB0fIOmtrIKu4vB+ dvamMar2Q/t/T/NlPVeagni8miJpkbb3Fop9g9l2OJOfnc+GEUOovaGuOilxMScSTZ rPca07Tv4xBygUp+CBzvJauPnmtHF8f4+kOmatvSP7okimtF2Exdwrb3i9lS27MUpE VJWoahaNQGHXLFfuTL8CEGJpvp2A7u050jLBY8PMsCK21Rx7Sn8dx5lzgqej9TILmG dLoqGAUyeeFJIeEoipiuAYd23C515ft6wndvJf/kpIaD0Y90xIyrgut9JIoG9hBqH0 H7iEO0STkVHTw== Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org 1. Change vfio from get_user_pages_remote(), to pin_user_pages_remote(). 2. Because all FOLL_PIN-acquired pages must be released via put_user_page(), also convert the put_page() call over to put_user_pages_dirty_lock(). Note that this effectively changes the code's behavior in vfio_iommu_type1.c: put_pfn(): it now ultimately calls set_page_dirty_lock(), instead of set_page_dirty(). This is probably more accurate. As Christoph Hellwig put it, "set_page_dirty() is only safe if we are dealing with a file backed page where we have reference on the inode it hangs off." [1] [1] https://lore.kernel.org/r/20190723153640.GB720@lst.de Cc: Alex Williamson Signed-off-by: John Hubbard --- drivers/vfio/vfio_iommu_type1.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type= 1.c index c7a111ad9975..18aa36b56896 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -327,9 +327,8 @@ static int put_pfn(unsigned long pfn, int prot) { if (!is_invalid_reserved_pfn(pfn)) { struct page *page =3D pfn_to_page(pfn); - if (prot & IOMMU_WRITE) - SetPageDirty(page); - put_page(page); + + put_user_pages_dirty_lock(&page, 1, prot & IOMMU_WRITE); return 1; } return 0; @@ -347,7 +346,7 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned= long vaddr, flags |=3D FOLL_WRITE; =20 down_read(&mm->mmap_sem); - ret =3D get_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM, + ret =3D pin_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM, page, NULL, NULL); if (ret =3D=3D 1) { *pfn =3D page_to_pfn(page[0]); --=20 2.24.0 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 57466C432C3 for ; Fri, 15 Nov 2019 06:00:02 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 064F02072D for ; Fri, 15 Nov 2019 06:00:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="UiL51t0e" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 064F02072D Authentication-Results: mail.kernel.org; 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Thu, 14 Nov 2019 21:53:45 -0800 From: John Hubbard To: Andrew Morton Subject: [PATCH v5 19/24] vfio, mm: pin_user_pages (FOLL_PIN) and put_user_page() conversion Date: Thu, 14 Nov 2019 21:53:35 -0800 Message-ID: <20191115055340.1825745-20-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191115055340.1825745-1-jhubbard@nvidia.com> References: <20191115055340.1825745-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1573797226; bh=nI3kBsm1YYmEZh4r0pGrnWMl68q+Rq4M7HG7pTJrYP4=; h=X-PGP-Universal:From:To:CC:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=UiL51t0eNbBdWE9uBI9yzZIoqGTugx4HY+QWVen5p/yEalMtSkB0fIOmtrIKu4vB+ dvamMar2Q/t/T/NlPVeagni8miJpkbb3Fop9g9l2OJOfnc+GEUOovaGuOilxMScSTZ rPca07Tv4xBygUp+CBzvJauPnmtHF8f4+kOmatvSP7okimtF2Exdwrb3i9lS27MUpE VJWoahaNQGHXLFfuTL8CEGJpvp2A7u050jLBY8PMsCK21Rx7Sn8dx5lzgqej9TILmG dLoqGAUyeeFJIeEoipiuAYd23C515ft6wndvJf/kpIaD0Y90xIyrgut9JIoG9hBqH0 H7iEO0STkVHTw== X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Michal Hocko , Jan Kara , kvm@vger.kernel.org, linux-doc@vger.kernel.org, David Airlie , Dave Chinner , dri-devel@lists.freedesktop.org, LKML , linux-mm@kvack.org, Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma@vger.kernel.org, Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , linux-media@vger.kernel.org, Shuah Khan , John Hubbard , linux-block@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Al Viro , Dan Williams , Mauro Carvalho Chehab , Magnus Karlsson , Jens Axboe , netdev@vger.kernel.org, Alex Williamson , Daniel Vetter , linux-fsdevel@vger.kernel.org, bpf@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, "David S . Miller" , Mike Kravetz Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" 1. Change vfio from get_user_pages_remote(), to pin_user_pages_remote(). 2. Because all FOLL_PIN-acquired pages must be released via put_user_page(), also convert the put_page() call over to put_user_pages_dirty_lock(). Note that this effectively changes the code's behavior in vfio_iommu_type1.c: put_pfn(): it now ultimately calls set_page_dirty_lock(), instead of set_page_dirty(). This is probably more accurate. As Christoph Hellwig put it, "set_page_dirty() is only safe if we are dealing with a file backed page where we have reference on the inode it hangs off." [1] [1] https://lore.kernel.org/r/20190723153640.GB720@lst.de Cc: Alex Williamson Signed-off-by: John Hubbard --- drivers/vfio/vfio_iommu_type1.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type= 1.c index c7a111ad9975..18aa36b56896 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -327,9 +327,8 @@ static int put_pfn(unsigned long pfn, int prot) { if (!is_invalid_reserved_pfn(pfn)) { struct page *page =3D pfn_to_page(pfn); - if (prot & IOMMU_WRITE) - SetPageDirty(page); - put_page(page); + + put_user_pages_dirty_lock(&page, 1, prot & IOMMU_WRITE); return 1; } return 0; @@ -347,7 +346,7 @@ static int vaddr_get_pfn(struct mm_struct *mm, unsigned= long vaddr, flags |=3D FOLL_WRITE; =20 down_read(&mm->mmap_sem); - ret =3D get_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM, + ret =3D pin_user_pages_remote(NULL, mm, vaddr, 1, flags | FOLL_LONGTERM, page, NULL, NULL); if (ret =3D=3D 1) { *pfn =3D page_to_pfn(page[0]); --=20 2.24.0 From mboxrd@z Thu Jan 1 00:00:00 1970 From: John Hubbard Subject: [PATCH v5 19/24] vfio, mm: pin_user_pages (FOLL_PIN) and put_user_page() conversion Date: Thu, 14 Nov 2019 21:53:35 -0800 Message-ID: <20191115055340.1825745-20-jhubbard@nvidia.com> References: <20191115055340.1825745-1-jhubbard@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Return-path: Received: from hqemgate16.nvidia.com (hqemgate16.nvidia.com [216.228.121.65]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0D66D6E15A for ; Fri, 15 Nov 2019 05:53:50 +0000 (UTC) In-Reply-To: <20191115055340.1825745-1-jhubbard@nvidia.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Andrew Morton Cc: Michal Hocko , Jan Kara , kvm@vger.kernel.org, linux-doc@vger.kernel.org, David Airlie , Dave Chinner , dri-devel@lists.freedesktop.org, LKML , linux-mm@kvack.org, Paul Mackerras , linux-kselftest@vger.kernel.org, Ira Weiny , Jonathan Corbet , linux-rdma@vger.kernel.org, Michael Ellerman , Christoph Hellwig , Jason Gunthorpe , Vlastimil Babka , =?UTF-8?q?Bj=C3=B6rn=20T=C3=B6pel?= , linux-media@vger.kernel.org, Shuah Khan , John Hubbard , linux-block@vger.kernel.org, =?UTF-8?q?J=C3=A9r=C3=B4me=20Glisse?= , Al Viro , Dan Williams List-Id: dri-devel@lists.freedesktop.org MS4gQ2hhbmdlIHZmaW8gZnJvbSBnZXRfdXNlcl9wYWdlc19yZW1vdGUoKSwgdG8KcGluX3VzZXJf cGFnZXNfcmVtb3RlKCkuCgoyLiBCZWNhdXNlIGFsbCBGT0xMX1BJTi1hY3F1aXJlZCBwYWdlcyBt dXN0IGJlIHJlbGVhc2VkIHZpYQpwdXRfdXNlcl9wYWdlKCksIGFsc28gY29udmVydCB0aGUgcHV0 X3BhZ2UoKSBjYWxsIG92ZXIgdG8KcHV0X3VzZXJfcGFnZXNfZGlydHlfbG9jaygpLgoKTm90ZSB0 aGF0IHRoaXMgZWZmZWN0aXZlbHkgY2hhbmdlcyB0aGUgY29kZSdzIGJlaGF2aW9yIGluCnZmaW9f aW9tbXVfdHlwZTEuYzogcHV0X3BmbigpOiBpdCBub3cgdWx0aW1hdGVseSBjYWxscwpzZXRfcGFn ZV9kaXJ0eV9sb2NrKCksIGluc3RlYWQgb2Ygc2V0X3BhZ2VfZGlydHkoKS4gVGhpcyBpcwpwcm9i YWJseSBtb3JlIGFjY3VyYXRlLgoKQXMgQ2hyaXN0b3BoIEhlbGx3aWcgcHV0IGl0LCAic2V0X3Bh Z2VfZGlydHkoKSBpcyBvbmx5IHNhZmUgaWYgd2UgYXJlCmRlYWxpbmcgd2l0aCBhIGZpbGUgYmFj a2VkIHBhZ2Ugd2hlcmUgd2UgaGF2ZSByZWZlcmVuY2Ugb24gdGhlIGlub2RlIGl0CmhhbmdzIG9m Zi4iIFsxXQoKWzFdIGh0dHBzOi8vbG9yZS5rZXJuZWwub3JnL3IvMjAxOTA3MjMxNTM2NDAuR0I3 MjBAbHN0LmRlCgpDYzogQWxleCBXaWxsaWFtc29uIDxhbGV4LndpbGxpYW1zb25AcmVkaGF0LmNv bT4KU2lnbmVkLW9mZi1ieTogSm9obiBIdWJiYXJkIDxqaHViYmFyZEBudmlkaWEuY29tPgotLS0K IGRyaXZlcnMvdmZpby92ZmlvX2lvbW11X3R5cGUxLmMgfCA3ICsrKy0tLS0KIDEgZmlsZSBjaGFu Z2VkLCAzIGluc2VydGlvbnMoKyksIDQgZGVsZXRpb25zKC0pCgpkaWZmIC0tZ2l0IGEvZHJpdmVy cy92ZmlvL3ZmaW9faW9tbXVfdHlwZTEuYyBiL2RyaXZlcnMvdmZpby92ZmlvX2lvbW11X3R5cGUx LmMKaW5kZXggYzdhMTExYWQ5OTc1Li4xOGFhMzZiNTY4OTYgMTAwNjQ0Ci0tLSBhL2RyaXZlcnMv dmZpby92ZmlvX2lvbW11X3R5cGUxLmMKKysrIGIvZHJpdmVycy92ZmlvL3ZmaW9faW9tbXVfdHlw ZTEuYwpAQCAtMzI3LDkgKzMyNyw4IEBAIHN0YXRpYyBpbnQgcHV0X3Bmbih1bnNpZ25lZCBsb25n IHBmbiwgaW50IHByb3QpCiB7CiAJaWYgKCFpc19pbnZhbGlkX3Jlc2VydmVkX3BmbihwZm4pKSB7 CiAJCXN0cnVjdCBwYWdlICpwYWdlID0gcGZuX3RvX3BhZ2UocGZuKTsKLQkJaWYgKHByb3QgJiBJ T01NVV9XUklURSkKLQkJCVNldFBhZ2VEaXJ0eShwYWdlKTsKLQkJcHV0X3BhZ2UocGFnZSk7CisK KwkJcHV0X3VzZXJfcGFnZXNfZGlydHlfbG9jaygmcGFnZSwgMSwgcHJvdCAmIElPTU1VX1dSSVRF KTsKIAkJcmV0dXJuIDE7CiAJfQogCXJldHVybiAwOwpAQCAtMzQ3LDcgKzM0Niw3IEBAIHN0YXRp YyBpbnQgdmFkZHJfZ2V0X3BmbihzdHJ1Y3QgbW1fc3RydWN0ICptbSwgdW5zaWduZWQgbG9uZyB2 YWRkciwKIAkJZmxhZ3MgfD0gRk9MTF9XUklURTsKIAogCWRvd25fcmVhZCgmbW0tPm1tYXBfc2Vt KTsKLQlyZXQgPSBnZXRfdXNlcl9wYWdlc19yZW1vdGUoTlVMTCwgbW0sIHZhZGRyLCAxLCBmbGFn cyB8IEZPTExfTE9OR1RFUk0sCisJcmV0ID0gcGluX3VzZXJfcGFnZXNfcmVtb3RlKE5VTEwsIG1t LCB2YWRkciwgMSwgZmxhZ3MgfCBGT0xMX0xPTkdURVJNLAogCQkJCSAgICBwYWdlLCBOVUxMLCBO VUxMKTsKIAlpZiAocmV0ID09IDEpIHsKIAkJKnBmbiA9IHBhZ2VfdG9fcGZuKHBhZ2VbMF0pOwot LSAKMi4yNC4wCgpfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f XwpkcmktZGV2ZWwgbWFpbGluZyBsaXN0CmRyaS1kZXZlbEBsaXN0cy5mcmVlZGVza3RvcC5vcmcK aHR0cHM6Ly9saXN0cy5mcmVlZGVza3RvcC5vcmcvbWFpbG1hbi9saXN0aW5mby9kcmktZGV2ZWw= From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 617C1C432C3 for ; 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