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=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 4FC68C432C0 for ; Thu, 21 Nov 2019 07:18:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 21B7020872 for ; Thu, 21 Nov 2019 07:18:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="UDv7hXGr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727360AbfKUHRp (ORCPT ); Thu, 21 Nov 2019 02:17:45 -0500 Received: from hqemgate14.nvidia.com ([216.228.121.143]:13023 "EHLO hqemgate14.nvidia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727050AbfKUHN7 (ORCPT ); Thu, 21 Nov 2019 02:13:59 -0500 Received: from hqpgpgate102.nvidia.com (Not Verified[216.228.121.13]) by hqemgate14.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Wed, 20 Nov 2019 23:14:00 -0800 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate102.nvidia.com (PGP Universal service); Wed, 20 Nov 2019 23:13:57 -0800 X-PGP-Universal: processed; by hqpgpgate102.nvidia.com on Wed, 20 Nov 2019 23:13:57 -0800 Received: from HQMAIL109.nvidia.com (172.20.187.15) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Thu, 21 Nov 2019 07:13:57 +0000 Received: from hqnvemgw03.nvidia.com (10.124.88.68) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1473.3 via Frontend Transport; Thu, 21 Nov 2019 07:13:57 +0000 Received: from blueforge.nvidia.com (Not Verified[10.110.48.28]) by hqnvemgw03.nvidia.com with Trustwave SEG (v7,5,8,10121) id ; Wed, 20 Nov 2019 23:13:57 -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 v7 19/24] vfio, mm: pin_user_pages (FOLL_PIN) and put_user_page() conversion Date: Wed, 20 Nov 2019 23:13:49 -0800 Message-ID: <20191121071354.456618-20-jhubbard@nvidia.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: <20191121071354.456618-1-jhubbard@nvidia.com> References: <20191121071354.456618-1-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=1574320440; 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=UDv7hXGrBG/yd6ToTnVLxiTw9r1H4giBXZNVJ6DpNhyAl4KY/tyMaq+wFxnHOdMtV i6AkoGUNL3wEyFlwt9HbgsAyf/SniOPZK9HqqqTkGWvp95bKLP4ZrPVIbebeGhFVNg eSmLsDzCah1dUYnfTnfSryQIs4sk8ta+DUuaK7rV4th2Fx3ncB3J6jdaJrhY1OwcOK fgT1xS6ChSchMjYwgaCp4F9NxbbSvQLXsqEHs80t/lCoGAURk4yw10TZK1u8rEw5I4 fjDaykUkkaLbGldcR6iMqKlwWiFfTSZxzqAG1djSZcHsSLWbP7WLlivUWKovbw8neX NjXDeQTFV8djg== Sender: bpf-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: bpf@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