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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6466DEB64DC for ; Tue, 18 Jul 2023 00:54:23 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id EF0F08D0002; Mon, 17 Jul 2023 20:54:22 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EA1418D0001; Mon, 17 Jul 2023 20:54:22 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D1A348D0002; Mon, 17 Jul 2023 20:54:22 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id BF6BF8D0001 for ; Mon, 17 Jul 2023 20:54:22 -0400 (EDT) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id 9B778140655 for ; Tue, 18 Jul 2023 00:54:22 +0000 (UTC) X-FDA: 81022911564.28.6DE0842 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by imf06.hostedemail.com (Postfix) with ESMTP id 7B57418001A for ; Tue, 18 Jul 2023 00:54:18 +0000 (UTC) Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=VyLXIr9S; spf=pass (imf06.hostedemail.com: domain of yan.y.zhao@intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=yan.y.zhao@intel.com; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1689641659; h=from:from:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Dh/ZeWxC+kGfzsS2Q4BDB2kVxaR85Ub7GPttBkcLzYY=; b=QhBWWm1xExdm47fp6ki+RFwOTMsm+i456uDMxZoGR0xOQxTrEX0GCZ8OQ66G02+RQ7nhqi g5odnp/8rqs+xV6gM5WV4C4P8bh/zIHCZro8pDsqKC4vCQAnBsRveWhbNN6GrLRJ2u7Ofk 9aj/LNYaU/1LeE3Baff5IQ0selCv/K8= ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1689641659; a=rsa-sha256; cv=fail; b=MF0rnIseL2hgCckILcsP/Z/iK88fiwBWaIQGCGThMUhbUU+ktJYKMnJuYcZFYxDQS771Zd hw4EQ6XHUI2ZC3/n5uvoGjGEPSmNVWZX1fsO7QA4iQGsazJ00BgR3XJN+S/JYeQRfYRjTM vejK2DGjLx+CFT1HBqmSJ8YInaEoYaQ= ARC-Authentication-Results: i=2; imf06.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=VyLXIr9S; spf=pass (imf06.hostedemail.com: domain of yan.y.zhao@intel.com designates 192.55.52.136 as permitted sender) smtp.mailfrom=yan.y.zhao@intel.com; dmarc=pass (policy=none) header.from=intel.com; arc=reject ("signature check failed: fail, {[1] = sig:microsoft.com:reject}") DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1689641658; x=1721177658; h=date:from:to:cc:subject:message-id:reply-to:references: content-transfer-encoding:in-reply-to:mime-version; bh=1r1u7OfW0XzAOEUIEvxHxcPTgY0krNzZyqiskEMVbf8=; b=VyLXIr9SHTLMxcFaqhKibTKmotfU6m60+VILtQKHiAlw8T6G/uKGdvPo kjbbiHqUOymtUJABY3zJBIVD8SiWqT7AcFI4BIBr8efNCxTzGE9kQRShl 93Wb87G4oYQaBiBF33TMfJkrJ3pyUhSyR6i7CHSGI7RheLqstnhCzGzg5 rQUVSyzgYTs+4U+FzeTkLCf19IasphzZ7Hv2U7/gZa6BrIeTKSoG1R06R i8ivgfd8fNO713xWPdILTp41zHF09kQ2zdjSwxkS5li6RImurHHrST1ui dOODHaszrSv7HwHiYP2IY6sICSwGBdTKhkCFVLnzfwa3L6g/OxpRZXNP1 g==; X-IronPort-AV: E=McAfee;i="6600,9927,10774"; a="345669581" X-IronPort-AV: E=Sophos;i="6.01,211,1684825200"; d="scan'208";a="345669581" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 Jul 2023 17:54:16 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10774"; a="847503289" X-IronPort-AV: E=Sophos;i="6.01,211,1684825200"; d="scan'208";a="847503289" Received: from orsmsx601.amr.corp.intel.com ([10.22.229.14]) by orsmga004.jf.intel.com with ESMTP; 17 Jul 2023 17:54:16 -0700 Received: from orsmsx610.amr.corp.intel.com (10.22.229.23) by ORSMSX601.amr.corp.intel.com (10.22.229.14) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Mon, 17 Jul 2023 17:54:16 -0700 Received: from orsmsx610.amr.corp.intel.com (10.22.229.23) by ORSMSX610.amr.corp.intel.com (10.22.229.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27; Mon, 17 Jul 2023 17:54:15 -0700 Received: from orsedg603.ED.cps.intel.com (10.7.248.4) by orsmsx610.amr.corp.intel.com (10.22.229.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.27 via Frontend Transport; Mon, 17 Jul 2023 17:54:15 -0700 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (104.47.56.176) by edgegateway.intel.com (134.134.137.100) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.27; Mon, 17 Jul 2023 17:54:15 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=Mj7EEx1jUyNV7iBaj5mp+pe2JINx7cOO96XbihpGzuMjV363g4Td8e/Xf1SJ5QNtQ9+S7rR7Ejub43D6PLGOnT5ek9ECXGrKNnuDwf+45yQKQoffG14JvoSM9gZNt61fod4DQKQ5NJvP6Cdc5C3sKeR1zNId19gFU7P/CDbeLP0nV8jzJyEyWjJPoxnOAO784wmioxVbVzUyqilRDmnezCDdABCoJZLEUY98ymkQe3kD/JUYtH/yQx4uFAWq+jqASBGjo72EAOquSPqP2zNddzlNq5g0+J6g6AudsJHMV5yaFr79UcmEwt9AiyoWlJ9gHAI1Tzn7E1zMLtDARRq08w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=Dh/ZeWxC+kGfzsS2Q4BDB2kVxaR85Ub7GPttBkcLzYY=; b=mrCeekzh2HAQbqcVrL+IQzMKHAdmptmZ+ACdSuFXsFWMeWPI3VUsNWjliIhcgu5mrt0vKd2EEOe1r3tTP4/BKwwILfgc5mh4HruQ5bGDsd9lngzqtha/frbBRbimw5VwWZpkWE+K7QNMA6CMcNs1zs64ugaQ2zK/PQaJBJJoN6K/eT4q16HbaBYn2eyRaLhvgiJaKdrtP3m+ZckvcZ8TbD46dP08CCXnFfvVXUrvLQmNnxiq9FZkgPc0mjM1pmjVVcaPUk/Fcvs9bjbPuPHMRgDONGuVLfOshNXnTJ4DJPVZOfeC2EJ2NdLpwc0RcCeXehWfDFegwCBFRys8WiHIhA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Received: from DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) by SN7PR11MB6799.namprd11.prod.outlook.com (2603:10b6:806:261::18) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.6588.32; Tue, 18 Jul 2023 00:54:13 +0000 Received: from DS7PR11MB5966.namprd11.prod.outlook.com ([fe80::c7b3:8ced:860d:6fe6]) by DS7PR11MB5966.namprd11.prod.outlook.com ([fe80::c7b3:8ced:860d:6fe6%4]) with mapi id 15.20.6588.031; Tue, 18 Jul 2023 00:54:13 +0000 Date: Tue, 18 Jul 2023 08:27:27 +0800 From: Yan Zhao To: Suren Baghdasaryan CC: David Hildenbrand , Matthew Wilcox , Dan Carpenter , , Andrew Morton , "Liam R. Howlett" , Laurent Dufour , Michel Lespinasse , Jerome Glisse , Michal Hocko , Vlastimil Babka , Johannes Weiner , Peter Xu , Dimitri Sivanich , Mike Travis , Steve Wahl Subject: Re: [bug report] mm: replace vma->vm_flags direct modifications with modifier calls Message-ID: Reply-To: Yan Zhao References: <331201b2-5f13-8e81-b5d4-b17f8784d498@redhat.com> Content-Type: text/plain; charset="utf-8" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: X-ClientProxiedBy: SI2PR01CA0043.apcprd01.prod.exchangelabs.com (2603:1096:4:193::12) To DS7PR11MB5966.namprd11.prod.outlook.com (2603:10b6:8:71::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR11MB5966:EE_|SN7PR11MB6799:EE_ X-MS-Office365-Filtering-Correlation-Id: 0c40a592-d204-420d-1502-08db87298107 X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS7PR11MB5966.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(346002)(39860400002)(396003)(136003)(376002)(366004)(451199021)(316002)(41300700001)(53546011)(6512007)(186003)(6506007)(26005)(6486002)(478600001)(82960400001)(54906003)(6666004)(6916009)(66946007)(66476007)(66556008)(38100700002)(4326008)(7416002)(86362001)(3450700001)(8676002)(8936002)(5660300002)(2906002);DIR:OUT;SFP:1102; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?RkltbEJOaGZkVU9OUlRmRDhwUXh6SlVreEkyQzJxTkdlbnRLL0FyTmZGaVJa?= =?utf-8?B?bzlPRTJpVTNYYnF3YVRIcXBtL3JLSUNGMWgyc3dZMXl4S3ZFQlprRnhhaHFu?= =?utf-8?B?TlVVRHp1bVp0cWhxd2pPbGdYUHVsVDkra2N3WGxlOXlKS0lmQU1WU2x1TWQ3?= =?utf-8?B?bGIxTUFBZGMrZko3TGtIS2xVWFVPcytRSDhIUll0eEtrNW00RVVObWo5enRS?= =?utf-8?B?OVRtR29JZTJvNlY0NzNqVXR3S252YmlLTUR2UFJLR1A5NHlReEN5NTVmaHdx?= =?utf-8?B?NUNoK09CN1RjS3VPSWF2QnV3TnM0YjlOMVlCOGhjeW01akZwcW1iVzhSNDlN?= =?utf-8?B?VWI5cmhpVitZZFhFdTZHOFUrL1NmZHY5M1ZvOHVzSDBXZVpmM2RSeXZyc0xl?= =?utf-8?B?NnBkSkI1RU9BTFluNjE2Rks3VXdXWG5tOE1EekNNK3VPZVJZN2NnM3JvSzlW?= =?utf-8?B?MmVXczJ6RllBeXZoVW1vOWVobm12N2tndHFDQTcyY0gxMU5VYzM1S3MzLzVZ?= =?utf-8?B?VlIzcmI3Z1MwYUFXd3NOcUMzcVo0YW9CVWFTWTNoWlh5Z3dhOU1rN2VrOW8r?= =?utf-8?B?Myt4U2FJTk93dXhlZXFibnRxWXlDZHNYZmRzL0JKS2lpdmFWRzltNWtWTWxJ?= =?utf-8?B?cERlNFlVNklKQjA4RVNXc0JGd0xVbzhCRU1oTWFpZ1ZDT0tCcVhsTUJhcFNI?= =?utf-8?B?bTg1KzJwMk1kM1NXalY5NTRQVGJpY1RXb3UwamJ3dXNJbHZkNk1wY3hNUDdj?= =?utf-8?B?MmUrMmhTQ3RUVlBLL1lraUtGKzJwdUJydzByVjg1WlBzOG1qd08rZzlvd21G?= =?utf-8?B?b0w1dTFjcFdRM2dLb043NDhSYmZ2UjZ1YkVtWE1XYzB4UE9SaFBmRDJGaURl?= =?utf-8?B?bFErYVpqelhTRVcvUWFFd0V2K2szcHhtTWVGcVRlM0xHZCs2ZldzMEErV0hm?= =?utf-8?B?S3UyQzhQVVlEaXZvb0hOQ1IvQldzenZlMXdGbExSc0xES296L2NIRHhEQjZh?= =?utf-8?B?K0FoZ005ZWlJd1ZySzB1b1M1WFAraDRSTTd2WElZZVpUY2tQeWJ6NzZGM1hk?= =?utf-8?B?czIxRk0vRTV1OGpGNy82SzVFQ0RRTkZzV04yNWNkZDl1OUxYU2cydXByZTJa?= =?utf-8?B?ZHlKY3RwRzVkQXJpUXJ0QzF3WU9tVU8xZ3B1U0t3WHJMZlAwYnhmOVFGemFz?= =?utf-8?B?VU5mZGJCUHFNMXVXRThpZ3hva201SlREOG5QdGhBTGRSQlBpUlpWVnBwTVRy?= =?utf-8?B?UzFmV3RYVWFOdCtOdWJtOE5iUm5tNklhNnM1TE4wTU9MWTNkM09udSt0bUl6?= =?utf-8?B?aEdST2liZS9kWnNLVTJZMStWdWxWMEFVZ0lsV043ajRzQmw0MXE0M3F5NDlz?= =?utf-8?B?TW9XWWxvQVNTMTQ3eERyZFR0bW1aNWliMHVCaFArVTlURGNYU01LL1hhdE54?= =?utf-8?B?TnNuRjVkbHdPQ3pVd0pqdnpxYXB4MVJxZ2dSQzNiNTBmQlBBVVJjTWFoaEtJ?= =?utf-8?B?eUR2RklrdXBsOGowR0VsSTFVS0RKYnFIR3RuNHlBTTIzZmdnN0FkbjA5ZFZX?= =?utf-8?B?UTloaEJsVFVURVVPZTdBbVNDUWVud2ZvQlQvTXdCVGVSWGZFL0ErZFp0bVY1?= =?utf-8?B?R2FEdFU5WkI3VUs1MUMxTGh4K1ZiczJteGhkMlJwVUdYTVpYRjZJYW8ybWNU?= =?utf-8?B?dk5yZFFOK2p6K0t4OGlHcm1weG9SUzdCVDlmelM5eURPd0E4Q2JKWDc2Q3Fr?= =?utf-8?B?Yi93M08rSUdXS2duak5WelZCbStSMmNLSDJDWUdNR1dlc1dsdk8vaFpzZm5K?= =?utf-8?B?RlNGRUVST1Z5b0N4N3FnU1hPZVZIRkIrWjJYb2tYeU0zaHAycnY4ejhQYmJj?= =?utf-8?B?cldKQ0RqR3FzV1RGTnorMU1XcHoyRGErNXJ0Q01GUitSNFJpT2dGVU5Ydk5F?= =?utf-8?B?RnBKM1hQbUFBNWRuMmhZbGE3VW5WbGJDMWpyNDVNYnYzWVNMMVZaZEVjamF3?= =?utf-8?B?Qk15d1NlMjdYSUJ5djNNV1Qrb1VDcWk4NE9WKzJEME1FeU5WNk5pNkl3Mm0z?= =?utf-8?B?TE5ZS1k0bGhtUU92QUQ4L3JFNHdqWHBIS0xidWV5RU14a2lVblhGVjQ5NVJl?= =?utf-8?Q?1jDNLcMvz7CCHDfKUB49p1+8I?= X-MS-Exchange-CrossTenant-Network-Message-Id: 0c40a592-d204-420d-1502-08db87298107 X-MS-Exchange-CrossTenant-AuthSource: DS7PR11MB5966.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Jul 2023 00:54:13.2826 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: gIYoVtccJzOqr5fKg407QypQRSs7vmSNAyuPd2mCeEyDvCJWoBbTDMGonvTSKGJmHehVh2gPtQ4+Buve2z6Ong== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR11MB6799 X-OriginatorOrg: intel.com X-Rspamd-Queue-Id: 7B57418001A X-Rspam-User: X-Stat-Signature: 65t378yar9z8tbhyyccnzwyfgfsy6kci X-Rspamd-Server: rspam03 X-HE-Tag: 1689641658-537332 X-HE-Meta: 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 xRR6/u56 1htVmpTvQW2vq1YqwlUWnSCOypN6lg0A+mRFbK86eNPT2HxXGppFTirGKncVb1UeWG8EDTcXg6jem/weLmjhdnCaGjSkseTdlj6So6/P412BjP0g1yq1Dj+A424B0UPRo5GRub0RKDi2L6ngDIDU7zKZwbvd202RNAS+X5lkHHO0QQHCps8t3aCAjoGe8l/jEr6rFpME3XaTz5TbYSkQh63/bQyKiEIeUk86/GkBudFNpVMm5KXx1zNxqehZ4krqheX0cW4PfPzwM4EC8iB54W/M/j/n6vWuycR6BRmjpOGYv7YIKcIVTwUhc+Sf9JfgbaJ5i2Uj+YmBjCXCVuDERgaPnfejLo9y0YvVZabhvTb9SRH5ObXX8eozL+OuJf68W3apNdwm4Dzw0pxG2no8OXbT0S/p3FXW9BB7npM/NGjoeyWXS7qXDPCFMIw27DEpqyxy7 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Jul 17, 2023 at 09:18:34AM -0700, Suren Baghdasaryan wrote: > On Sun, Jul 16, 2023 at 11:40 PM Yan Zhao wrote: > > > > On Wed, Jul 12, 2023 at 07:48:06PM +0000, Suren Baghdasaryan wrote: > > > > Would we be able to fix it in stable simply by not triggering the > > > > vm_flags_set() in case these flags are already set? > > > > > > I think we can do that. gru_file_mmap() sets all the flags that are > > > set by remap_pfn_range_notrack() (VM_IO | VM_PFNMAP | VM_DONTEXPAND | > > > VM_DONTDUMP), so we can check if all bits are already present and skip > > > the vm_flags_set() call. > > > > > But on x86, remap_pfn_range() also sets flag VM_PAT. (in track_pfn_remap()). > > > > Is there any interface to allow device driver to pre-set this flag in .mmap() > > before .fault()? e.g. export track_pfn_remap() ? > > Driver should be able to call vm_flags_set() in its .mmap(). Do you mean do something like this in .mmap()? flags = VM_IO | VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP; #ifdef CONFIG_X86 flags |= VM_PAT; #endif vm_flags_set(vma, flags); But VM_PAT cannot be set until after a successful reserve_pfn_range(), which function is again not exported.