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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6BE92E67A6B for ; Tue, 3 Mar 2026 05:53:02 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AC9176B0005; Tue, 3 Mar 2026 00:53:01 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A4CA26B0088; Tue, 3 Mar 2026 00:53:01 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 903FE6B0089; Tue, 3 Mar 2026 00:53:01 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 7C98C6B0005 for ; Tue, 3 Mar 2026 00:53:01 -0500 (EST) Received: from smtpin28.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id E6D6A13B4DA for ; Tue, 3 Mar 2026 05:53:00 +0000 (UTC) X-FDA: 84503683320.28.8D2A7DF Received: from SN4PR0501CU005.outbound.protection.outlook.com (mail-southcentralusazon11011004.outbound.protection.outlook.com [40.93.194.4]) by imf21.hostedemail.com (Postfix) with ESMTP id 0B8721C0005 for ; Tue, 3 Mar 2026 05:52:57 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=FFGoXnAY; spf=pass (imf21.hostedemail.com: domain of jniethe@nvidia.com designates 40.93.194.4 as permitted sender) smtp.mailfrom=jniethe@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1772517178; h=from:from:sender: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=IlPR2Y3LYT3gIVwOXi1Mmn2FE4cpLAI87aqBElzWKNo=; b=e0GHAD0CTG8c/FpemkgB39Wb+jFgD2x8mgQ/tj7shIIrXC22qayOIwmpZ1biCqkDHt0Ugf okEIgSH3ieSZV0ub61nP33e54NMs4F+fj12p92MrrED/N7d02GaC5Z+3cvSQrhbcV9xsPI Kqyc5bIr731543Tvye8/i+bIKu+ERK4= ARC-Authentication-Results: i=2; imf21.hostedemail.com; dkim=pass header.d=Nvidia.com header.s=selector2 header.b=FFGoXnAY; spf=pass (imf21.hostedemail.com: domain of jniethe@nvidia.com designates 40.93.194.4 as permitted sender) smtp.mailfrom=jniethe@nvidia.com; dmarc=pass (policy=reject) header.from=nvidia.com; arc=pass ("microsoft.com:s=arcselector10001:i=1") ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1772517178; a=rsa-sha256; cv=pass; b=WOZJhfzZvSYpq/DtxF4SIxizd9sSU7OVCVsl1QNhWm/3eEYoc1MPiHUjNC04lfflMgfF47 CD72KUWaIKFXVqRTrZaaZRnhSUaJvLj/ePQzj1G4fTbMwEa2iCWPNXXtbKwawmmLSrpxk8 Vhl2qPnn/UdTGw/nDrWEBQAtoQ7SxfM= ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=HGTPGdS+Jk9fHWvr4ri3J6qkmW6iLzLyX/Fb+uwnnCHc04fs2oowuFKBdgyZXnX+p3r0WbLfhzXPzwInYNowQvNRQxNMIww24495ojcHaeXV4QyQgbn6ZqeN1q/BImTdjAO2R+G1ohZGRXBzruGHxasD2TAxLPKdIrwE8HfIHsVvx9qKdc6BU7MbCCz0M+umChMwNNHZMbDLXKX6p0KtDWeeIPB4Q1ytn+viAxy4YBBjCOAJdmEb+wm0OtP5LDB+SVVt1fxMlcjSpfEXmjZZitK9qe80bEHMZtH2DMnXS1SNZWHfhbuWb3triFLfwfXFHFqdoR2P0815HFMG5mQqfQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector10001; 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=IlPR2Y3LYT3gIVwOXi1Mmn2FE4cpLAI87aqBElzWKNo=; b=cqJbnsNQrCeKjoV9RVGRpe5WGiI+Nk28hnEQPaEpndNs47QudZDUA461dPZSUSVvUkoYXqWkIM17W/dBPbve1OfuuNkD3AXzmDiEQTGKAgz6yChFUpLw4BbBct+RTYTtQCDlZG4nQ//Cxjkxbxooo3iLorMTu+prYalQxfuDAZTINCEqfa2WOlWOJWGsc/cKbkf/+H7hmoiSlcATvxknV8HCPnP89NtWIk4x0h3IOJr83CahPOB7RXCPiAULcmDQCtuWeDfLmQUHt7CwEq5TDgvICiI90bGf0cACdAZYPHythdz0muvgijutNINqA5eZJxrx/vOigRHVTndNpr5WCQ== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=IlPR2Y3LYT3gIVwOXi1Mmn2FE4cpLAI87aqBElzWKNo=; b=FFGoXnAY5qD0aH7hBcvxxqP6Z/IZ5myGQlI0rqvI6X0rSQAzDS/8B7x0j1Qo5AwGHq4QrH1g1w1kJW7Ub2wh6C/Oz80VwDwILd86N9HGk4gE+60Ut7Q7UgFLrE3f0BIyFahT06kObfsBwJyZaHT6cjjP4CtbogjFeB4Ex6sNP1IJYnGRAIayvo2y2tougSPgadu//otuUd6DqBmN73F7DS9ZFjP/md/OeYEXhO7QrU3h2UrGFRZu9m0xj7l9cWdpJqMAXQed33bwCMyzHw/i6mW0eTKvwoHq4naFkydY0Pi83tDetw3d/0aZgzutlFYRS2BFdLCtDL5M5HWgZ9/EKg== Received: from DM4PR12MB9072.namprd12.prod.outlook.com (2603:10b6:8:be::6) by SA0PR12MB4495.namprd12.prod.outlook.com (2603:10b6:806:70::13) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9654.14; Tue, 3 Mar 2026 05:52:54 +0000 Received: from DM4PR12MB9072.namprd12.prod.outlook.com ([fe80::32dc:be07:3859:b4e3]) by DM4PR12MB9072.namprd12.prod.outlook.com ([fe80::32dc:be07:3859:b4e3%6]) with mapi id 15.20.9654.022; Tue, 3 Mar 2026 05:52:54 +0000 Message-ID: Date: Tue, 3 Mar 2026 16:52:44 +1100 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 01/13] mm/migrate_device: Introduce migrate_pfn_from_page() helper To: "David Hildenbrand (Arm)" , linux-mm@kvack.org Cc: balbirs@nvidia.com, matthew.brost@intel.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, ziy@nvidia.com, apopple@nvidia.com, lorenzo.stoakes@oracle.com, lyude@redhat.com, dakr@kernel.org, airlied@gmail.com, simona@ffwll.ch, rcampbell@nvidia.com, mpenttil@redhat.com, jgg@nvidia.com, willy@infradead.org, linuxppc-dev@lists.ozlabs.org, intel-xe@lists.freedesktop.org, jgg@ziepe.ca, Felix.Kuehling@amd.com, jhubbard@nvidia.com, maddy@linux.ibm.com, mpe@ellerman.id.au, ying.huang@linux.alibaba.com References: <20260202113642.59295-1-jniethe@nvidia.com> <20260202113642.59295-2-jniethe@nvidia.com> <9ee22635-a219-47bb-a397-bc4e141b408d@kernel.org> <5182bb7d-f7cf-4b8e-8320-996c52fe24d8@kernel.org> Content-Language: en-US From: Jordan Niethe In-Reply-To: <5182bb7d-f7cf-4b8e-8320-996c52fe24d8@kernel.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: BYAPR05CA0081.namprd05.prod.outlook.com (2603:10b6:a03:e0::22) To DM4PR12MB9072.namprd12.prod.outlook.com (2603:10b6:8:be::6) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR12MB9072:EE_|SA0PR12MB4495:EE_ X-MS-Office365-Filtering-Correlation-Id: 1d540d63-c5ce-4957-6498-08de78e91ccd X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024|7416014|7053199007; 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:DM4PR12MB9072.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(1800799024)(7416014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bXh2T3J6OER5dHNwcUU1V1p6WFNxQjBzUnQranc2UmY3dnVXMi9Ga2lqdzQy?= =?utf-8?B?aDNVSnYyV0Q2WEZ1U3crUmQwRklDVmZDWGN3Qnd5cXlOaXFPMXAxdmxpTWlY?= =?utf-8?B?VTJ6bGpxcnNXQW93aWl3YlczZDVtM0k5UktLSWtoN2pzb0pTQzQ3Nm5sRUNG?= =?utf-8?B?MEhmWnJRRTd0Y0liR0Z6UXdmZTU2c3hUdnlLV05SR0g2dWhkVUNyVEJsTTRH?= =?utf-8?B?ZTh1UGpVN0NMTW53L2t1YjNaaXhmUTNyVzF6L3lPRVBzYlYvd1N6dDJTK2p5?= =?utf-8?B?aTFlQmgyUHkyR3Eyb0NFRllzUTRUb0VQOWtaeUNsblNoMWNYL3hvMks2UG1O?= =?utf-8?B?MDdSSVdpRFBScW1oOTJkY2JDYnFuL3JlakxyYTVzZEJYdjNlM0JXaDJhTVBG?= =?utf-8?B?NVVFNWI5WVY5SnBSYzNUTzFheUlLOXJrMFhEalhUVHpwMkJlWVM3R1ZKL05G?= =?utf-8?B?MVlqeUxMTHIzR1pMVG5aZ0NPRDhKTjNQL1Y4Tm41WVdka2NmaE9IOEFGUW8v?= =?utf-8?B?UXJyajJpaklZalFWanZvMjhHU0lmZWxlUWdaTFVKT2xySkJTOUVIMFJBTVBv?= =?utf-8?B?Uy9MMjZ1ci9oa0JnYjR0bjVLK2pteUJLNXErQkpCMFhQY2tyWllIdk9Zb21l?= =?utf-8?B?amR4NHZCRFVUVUhNTUJ3RkFDSTJ2V3pmZnFMdUtPTTdlVVh3N1RNTytLVzFk?= =?utf-8?B?bXI3K3dSNEplNzdXZGFFS09LL3UzMHV5OFBBbG9sejJHNXdNbkt1Z1oxZW96?= =?utf-8?B?Y3Zrd0RoMW5pbVlGKzBvYXFjaUZ5S0JNRitjOUdSQzlVbUM1WnNJaExENmM1?= =?utf-8?B?RjZ0WFprd0FjRGkzWWRwZU9JZU90ZTVrMitKdUljU2xWTWtOaXdLV3YvSHVw?= =?utf-8?B?VGF1RzJKcUFkbEVRNzdkbzVZTWxnUXJmblZFWVdTYi95azRBRVpIbk5jV1hG?= =?utf-8?B?b2VJcFdHMDQxUnRSb0srRnE1Yk54MnRHOEh5aDFiNml6UXNQTEExWUdzU0dH?= =?utf-8?B?cVVyKzNuejRUOTJkelN4QWJCSkRtZzZSZmdySzJYSHhDZ2hkc1lLZXNsTkVu?= =?utf-8?B?NWN3TUQxY0VlM2k5TEJ4WGxzdHF0NTVaa0hqSzN3MCszZC9UTHlWdFpPTDh5?= =?utf-8?B?Q1B5dmxwOTg3djBvTFNGS3UyeCswQnBJNXMyYzlYTHFHMDVPdTduRTRkNUlr?= =?utf-8?B?VzBqWWlsWnpyOEVHVDdxbDNHcUZrdFNqdkQwZGF0ZGpoaHp5bVZYYkxUSVF2?= =?utf-8?B?ZXJJUmduNzRYeXJlZWhuTmpkYzRBWTcxVkZEOXdqR3VIeERwbXViekJmMGdD?= =?utf-8?B?cFFzc2tJYUM3bnhqakt2UkplWlBLMXBDa0ZGbUZQcklhQnl2NkgxblZKbE55?= =?utf-8?B?bnBuWFpoOUc4cDgxbDdZem8yTUNEdmZzeFlkRVRNcTVFRkVLUG9HVUZsVXEx?= =?utf-8?B?cVNtNnRVVmFEY05mRnpxVGZKTU5aMmJXSVlqWi9Md09HMlRIWmhsbFRnVEpi?= =?utf-8?B?ZGpzZ2U3enJWREhCK1V6dWt1QzJ5ckhudFRKS0w0Q05heGJZRGlmQ3FDdmp3?= =?utf-8?B?VjUrSEE1RzRXR0M3amJibGh3ZXNOS0FiOW05b25weWxhMEhoVkh1T21aenFr?= =?utf-8?B?a3huc1NVMVZkdFErTWdHbGJld2pRZmtna05vVm5hVEhXOGN5K25pVE9mL0Nn?= =?utf-8?B?L0lOLzdaTTh2aDNPZUtGYVozd1dEWGpORW9BcHBGdWlUcURYU0lNc0VEekNx?= =?utf-8?B?N3J2WisydDdaWS9xOVNJWUZMNUF0anlKWFFzNU8yWnNGR2FxcHBTRTF5WVdu?= =?utf-8?B?VndnY3lHZitibm1VVEpNOVpBalVOb2V5ZmFqNU51aWhzUjd6VmZZaXRHajVs?= =?utf-8?B?V2c1L3NtdlhFNFMwOHA5cXZFNzAwTzYvNVpiUEhvdWtEKzd2TVNjZ0oxVFlD?= =?utf-8?B?MXlCWUtOZ1pES2FFQnFxS1lmaXE5cG5ZWkJaWHpzbGNnMWlDN2pqYit2MmZR?= =?utf-8?B?UDhoS0VpWkpxR04zdmNva1pKLzNoa0JhOEZBRzJzc1pWMGJqUVQ3V3RROWRO?= =?utf-8?B?Y2IwaXo2dXBlWDlyS0NLcjVrd1FFODVHY3o0OFpiRzhBeUFpTjlxY2N6ekZS?= =?utf-8?B?clRnQlRrR2RLMktGNWx1U1dxZUJ5anpRSmJWYm90UlVoTVAvWEd6YkRoZWN0?= =?utf-8?B?d1BJZkkvVTRSSUp2RncrNmZZcmFOTzdteEtYWGx6bzkzRXV4WnpSMzZuNE81?= =?utf-8?B?R1pVbGptLzIvQ3pydXcyd3JZNDcwSUQ4bDBGdlBBWG8vcEJWZitucWdoOHFI?= =?utf-8?B?ZE5YREpiT3ViaWpWZHlpaEVyUy9TRWdFNHVCalN1VC9QN3BMZ0N3Zz09?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 1d540d63-c5ce-4957-6498-08de78e91ccd X-MS-Exchange-CrossTenant-AuthSource: DM4PR12MB9072.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Mar 2026 05:52:54.0975 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: f+qw/itqKyayInlKbDzIvFSr3qJADsJVPBZEcJEmWO4MoMaBgQMr+fJaNKQigNN4wHYZusq62nfjvre66GMWfQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SA0PR12MB4495 X-Rspam-User: X-Rspamd-Queue-Id: 0B8721C0005 X-Rspamd-Server: rspam08 X-Stat-Signature: 4sgtwouw9ybxi6oh5pnxh9i34ndsiwjs X-HE-Tag: 1772517177-675646 X-HE-Meta: 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 gg+NCpIV 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Hi On 2/3/26 20:22, David Hildenbrand (Arm) wrote: > On 3/2/26 00:38, Jordan Niethe wrote: >> Hi, >> >> On 28/2/26 08:11, David Hildenbrand (Arm) wrote: >>> On 2/2/26 12:36, Jordan Niethe wrote: >>>> To create a migrate entry from a given struct page, that page is first >>>> converted to its pfn, before passing the pfn to migrate_pfn(). >>>> >>>> A future change will remove device private pages from the physical >>>> address space. This will mean that device private pages no longer have a >>>> pfn and must be handled separately. >>>> >>>> Prepare for this with a new helper: >>>> >>>>      - migrate_pfn_from_page() >>>> >>>> This helper takes a struct page as parameter instead of a pfn. This will >>>> allow more flexibility for handling the mpfn differently for device >>>> private pages. >>>> >>>> Reviewed-by: Balbir Singh >>>> Acked-by: Felix Kuehling >>>> Signed-off-by: Jordan Niethe >>>> --- >>> >>> Acked-by: David Hildenbrand (Arm) > > I'll go through he remainder of the patchset this week. Much appreciated. > > While skimming over patch #2, I was wondering whether > "page_to_migration_pfn()" would better fit "migration_pfn_to_page". I guess you were thinking about migration_pfn_/from/_page() rather than "migration_pfn_to_page()"? Renaming it to page_to_migration_pfn() would be fine. > > ... and I was wondering why that code deals with pages instead of folios. > > E.g., > > page = folio_page(folio, 0); > mpfn[i] = migrate_pfn_from_page(page); > > Should just be > > mpfn[i] = folio_to_migration_pfn(folio); > > Right? This patch is quite limited, essentially just converts usages of migrate_pfn(page_to_pfn()) to migration_pfn_from_page(). However, I agree, there could be scope for moving some of those usages to folios. Was that example from drm_pagemap_migrate_populate_ram_pfn()? There 'page' goes on to be used elsewhere in the function so we'd need some further refactoring to fully benefit. I see migrate_vma_collect_huge_pmd() as a candidate for a folio_to_migration_pfn() function too. Thanks, Jordan. >