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 1551AC3A59F for ; Wed, 23 Nov 2022 19:54:34 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 12DDF8E0002; Wed, 23 Nov 2022 14:54:32 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 0B4298E0001; Wed, 23 Nov 2022 14:54:32 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id DF7938E0002; Wed, 23 Nov 2022 14:54:31 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id C84E98E0001 for ; Wed, 23 Nov 2022 14:54:31 -0500 (EST) Received: from smtpin12.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 9D996A0EA9 for ; Wed, 23 Nov 2022 19:54:31 +0000 (UTC) X-FDA: 80165759142.12.0081B93 Received: from mx0a-00069f02.pphosted.com (mx0a-00069f02.pphosted.com [205.220.165.32]) by imf01.hostedemail.com (Postfix) with ESMTP id C577F40010 for ; Wed, 23 Nov 2022 19:54:26 +0000 (UTC) Received: from pps.filterd (m0246627.ppops.net [127.0.0.1]) by mx0b-00069f02.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 2ANJiX3m009796; Wed, 23 Nov 2022 19:54:18 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : content-transfer-encoding : content-type : mime-version; s=corp-2022-7-12; bh=8ItNy649FN2cS/hBlkmzbF78ZBWdLK5y/XeURfLXDKY=; b=jUQhfJWQ+yFypKOa+eXlDi17bpm7UDaLM+4c7QNcKAN6b5y+DeZjV+s7bDybJ5eNafgx fDfv3yO3CHtz8fzp7973wTkxNAbou0kL5EZjnlv0i3Lg2o3LlrqyJUgJmnQjoCbswG4x 7k7g1Z0b10Vr1aIOItW2ChfgyKLipN+BsahzzTu5pvr14M4SZ4T7SVmQDukPSsVjF1ZW KypUq+lwOaTIsorqVKQE/0Pgyoq1/jM+o09DmjARTce11AMO6L8xMM9YNMby2Z6RpjCt tBceHbpJXhvp0m48CjzfwUNkMD3EZhWYeD0Px5ShHxWbUVxtkuQHqqiPt6C+8bcn2kjR RQ== Received: from phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta02.appoci.oracle.com [147.154.114.232]) by mx0b-00069f02.pphosted.com (PPS) with ESMTPS id 3m169535wq-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Nov 2022 19:54:17 +0000 Received: from pps.filterd (phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (8.17.1.5/8.17.1.5) with ESMTP id 2ANJKOFf009739; Wed, 23 Nov 2022 19:54:16 GMT Received: from nam10-dm6-obe.outbound.protection.outlook.com (mail-dm6nam10lp2101.outbound.protection.outlook.com [104.47.58.101]) by phxpaimrmta02.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 3kxnk7gws6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 23 Nov 2022 19:54:15 +0000 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=OjvIt40pSfnE23WraRfnx76YLSOZiTbyw8s14eN19g2jzU3qhylOB9fBPk4rAlgxEDhRW1cC1jO4YUjwTYMoF51gUs8fp9YYlGRQXpwRpJDX6khVcQ4KCQrrhlyniYmCXx6nYUDGXFgCgYnDRQ84Gl41+lmmFReXxYFsCcqd8EcrNy6SqPOZVGlMLJ9Mns/bPU/CiJvsHYkzkv4w2DYZwb+a/jfeWxxbfea8fAh4JtMJZfJMHlA7xwYSTNf+ImIxKI+Qnz9l8hNgDOD/UC7dy6z9lFyJs5hqULAQIZE5RHFyYDFpH44k8coGw5YrJR90Az6BOipyKc/6ArD3RKH2Ug== 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=8ItNy649FN2cS/hBlkmzbF78ZBWdLK5y/XeURfLXDKY=; b=C5rL6mSRWwIr3a4yBxxLZp+2ZNTmRsuSDKsEOA4e5OvNjo8FOEHLzOj9n84NAe6X6jlzhLUHQAIjxfRDcE5t151KULPxI4Yb4WIA1BUEfIeD3wI2CuEtrOMgjLjUhPxJ5m3gijsyrKACiAw59/X59Whqw6nUlfRl4WPKb2oZV5oQ0HDy2aJ0YVwOsqS4lPs61AhSUoHRgGyMZTW1WAanQL4/SCIp3j+kcsQrzcKt2fHVE7sFuZ8RBKfAq6GlyQXWyBmRLb8JOyiRCmdB3UxNKQdS16R2ZHWaC8Jii9nY9X3kAhu8rwkv5ktVPORHE3077W9m+I/tOCH39OnmpheTzw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=oracle.com; dmarc=pass action=none header.from=oracle.com; dkim=pass header.d=oracle.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.onmicrosoft.com; s=selector2-oracle-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=8ItNy649FN2cS/hBlkmzbF78ZBWdLK5y/XeURfLXDKY=; b=fpIJb0uKhf6t6SSD5mmE6zAQ3oeh2h+vMLsvUhk9rrvtQOMJ0EqykyQg5MGmdGNrMJ8V2WFKX5WgBhCHFdFsKFTpuh76R3UM1kdh/6htFu8H1Ir5Hkn5zfq8R5hyosqTtWSmJkVwNRPxt/Th888g+bYcDcpjiO2TZobgqsMu2VM= Received: from BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) by MW4PR10MB6300.namprd10.prod.outlook.com (2603:10b6:303:1ee::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5834.15; Wed, 23 Nov 2022 19:54:13 +0000 Received: from BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::8d67:8c42:d124:3721]) by BY5PR10MB4196.namprd10.prod.outlook.com ([fe80::8d67:8c42:d124:3721%4]) with mapi id 15.20.5834.015; Wed, 23 Nov 2022 19:54:13 +0000 From: Mike Kravetz To: stable@vger.kernel.org, linux-mm@kvack.org Cc: Yang Shi , Naoya Horiguchi , James Houghton , Oscar Salvador , Miaohe Lin , Muchun Song , Andrew Morton Subject: [PATCH 2/6] mm: filemap: check if THP has hwpoisoned subpage for PMD page fault Date: Wed, 23 Nov 2022 11:54:04 -0800 Message-Id: <20221123195408.135161-3-mike.kravetz@oracle.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221123195408.135161-1-mike.kravetz@oracle.com> References: <20221123195408.135161-1-mike.kravetz@oracle.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: MW4PR04CA0192.namprd04.prod.outlook.com (2603:10b6:303:86::17) To BY5PR10MB4196.namprd10.prod.outlook.com (2603:10b6:a03:20d::23) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BY5PR10MB4196:EE_|MW4PR10MB6300:EE_ X-MS-Office365-Filtering-Correlation-Id: 0e301b64-4302-41eb-7cf7-08dacd8c7eb6 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:BY5PR10MB4196.namprd10.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230022)(396003)(366004)(39860400002)(376002)(346002)(136003)(451199015)(36756003)(316002)(54906003)(6506007)(186003)(1076003)(83380400001)(2616005)(966005)(6666004)(6486002)(26005)(478600001)(6512007)(41300700001)(44832011)(8936002)(5660300002)(86362001)(38100700002)(2906002)(4326008)(66476007)(66946007)(8676002)(66556008);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?vcsFRKEqROvBI/FGrI3TwlTPw0FievWuSDbtzJBiskXZI0A3MBd8N56qkzrn?= =?us-ascii?Q?72SCZc1oEIVpll/4QwT1s3DDD1AjlV20cLNr7+JW5WjuSVRXQ9242a9GTcJw?= =?us-ascii?Q?0i+ABACH4sjt71eLCNqKJvuUZt1YbmnJj0vr+9sgafUlSP8zFH2Jnvh5PQ9X?= =?us-ascii?Q?ElSTzIf+kh0aDnpGf+OCxVqWqO+uyWus6kEbxYn5BmBt5R4DKd6htzFayVXw?= =?us-ascii?Q?h5euN2txs8IMJ+pLIVoHqYglLC4yihDko6PGooeQN6TH9ZBtjIQLSdT/fWvU?= =?us-ascii?Q?2tXJNp2eeElqnp/xB11y+Fc4rW9pUPkTlxAEPKS5N8UdalfeRECxN/asfDlU?= =?us-ascii?Q?V42ig81MjePIfxfMtRfMS313vDFmb50weRV0+AJovTSpVuTynCofojZY/xAl?= =?us-ascii?Q?oT5qxt4naiTNBbyLnVxN16cHYG/yhHAfLCAIadoUnOL++r2MsCC7bJ5k44Tp?= =?us-ascii?Q?NMasQe9jZlNOS5+gEXPMgBcZx2DmKrm+dEx1HB/8nJ2TahvSUR7l44oE/pBy?= =?us-ascii?Q?mfH/UNjEeIEPDWd0epB8PiR3rh05vh24/DrACgs3yfNyu3+5+XfHUuY/Y/Tu?= =?us-ascii?Q?n86BdSTYM2+Z5FiZ8RGvHEKC83lYQuNDxHv5COBID3AXK0+la/W3+ggSVJdi?= =?us-ascii?Q?WIZSZ+Z8izqt4f5Ej4KwHP/Kvwotz8vGmJS3MAfzNUhiyWPPta9WxSbmKauD?= =?us-ascii?Q?7xQP1QgFfowtE8CkTOKTDrZm7uWzb0ffezi4uBg91f5QSgYYHOYCJ85u4O13?= =?us-ascii?Q?Oz8NrADDyY/02fovJ1ve+YrsWwWQhSaSXPPuaX++7O1RhErN1RVNSmdflhOF?= =?us-ascii?Q?e4inyPYN8vz44hFmS4Beaaq9IouGxIgcjviY6XXUPm0L9NlTOQ3Otgqa/Cal?= =?us-ascii?Q?bmNd3OMs/+vaO+NXiEoGaVAUHoIEHG/mN2Gwv2f0XnIGXCAJDY3szbL+mvJ+?= =?us-ascii?Q?z8xeREsFAJH+QwO03CgX/KX9K3r7b0Hp+KaezruxhJ/IhuyNOJEsI+L7YePN?= =?us-ascii?Q?v9xLyMuRDJbFyyDh9xszlpYe7mLFUUIJ9Nr4NyIAoZCugRD7uaEAdADR6Xiw?= =?us-ascii?Q?VJlnUQOqzGv3xgD/HjIUKtpPgmSbTXdgxN1JaU1uWhSa7idIjW1oPsHhrwlT?= =?us-ascii?Q?LEHryfydF8sW5atZ0Ld/i4Ck582WwOY60go71HFpuipo+fb5wO5CtvZmy6Cw?= =?us-ascii?Q?6rFIGfLG7v83OK8V0EA3ztiE9lkbYakGgxFxLHIfTEV27woWu7tb8dm8ZuYP?= =?us-ascii?Q?gGW9Bh3XbEcozvNborY/X0pFrPsKgKdB4KkMO9curL81Z1MWw9a26kbMWZAh?= =?us-ascii?Q?sWqRfDz1PGhn2OpA/kqHAZ7wGcrByOLQXVnLnttpa++76jlU1bdubgZ2pcQL?= =?us-ascii?Q?KNlRT1V//ClCZ0ZMFPn5o4WNymJsX6hLi1Al+P79irecNWw+KxbzE21FTGSp?= =?us-ascii?Q?dB+PYK/cnLvtkZp4qa9B7rdKRp3F20btgS2hEVMdpn/Hy3fc1NL4m4PNJdZv?= =?us-ascii?Q?Gzv7MlJ8N+8rvxBOayGffqGPRyAdozxD98TLkIam891tITF4t3ZSslxaJ8Hw?= =?us-ascii?Q?1h9r89kChaWnea6dVjZ7BICZz/Ni7VTDuHHBAtMcF7b0JxXEfeKkdkT5/2oM?= =?us-ascii?Q?SQ=3D=3D?= X-MS-Exchange-AntiSpam-ExternalHop-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-ExternalHop-MessageData-0: =?us-ascii?Q?4bmhcq8L5iU7zsSkTC7iZaUYKzkX15Q97hrK1Z9eIqlhF+XL1mlb2PkU43KA?= =?us-ascii?Q?DEncWHvfvuNYODezWDC0hFvhzHAdNMsQSqN8r5C9xoYXJtNqnVVa6DoyCL2o?= =?us-ascii?Q?jJXHRi4yH1pPONOCx0LPkcqQxhetnjVepoqCBw9GKOwfIHq0AhSlr6s76kxb?= =?us-ascii?Q?DCGZI0ArlEcdWKd9UoUQ6n5oHPWeRXiVwbgskYB6Ewz+IPg+08zwjmAN41Vk?= =?us-ascii?Q?8JwQGCUeOj2sByBDus99TC0kiRh6NNp+GWJ9DePTo4IcZ7xIHxydtc2VfaBw?= =?us-ascii?Q?D+DIygtqGgL/iPN2uT1r4L6Jxu7DUOP2ZogXvKu/2KOj36RRW5bA3WkjQC1F?= =?us-ascii?Q?VOW6u4INm/xwus6jJniKZ+nUfY6ghdzt/dh9iZWBgoOCKVMdOPvCih0x0viy?= =?us-ascii?Q?WHGBMXtgMcah6EFkvyacKxApmT5SNWjp+VsenLoKEF6WcTUYbSgma0KazzqV?= =?us-ascii?Q?GK4Lsw+karh9z29w9MWABK1qkAYVIbrAHvd2/FepDdKl5Rah1qKNJX+MbPWo?= =?us-ascii?Q?HJ5/g0ndReB4xPIR2nmGM7HSL3JaHMZm2m9Cp4Jva65S5pbqiW5wFIfcDd+M?= =?us-ascii?Q?3bqVrOKOabxIggeGQOXYZt1TCgUDuc7Xtu6eCdKP219Dtc/i/Hoz4BfQllKi?= =?us-ascii?Q?9QApCdDcPyRg8Dh4qa4K4zo0sQdK1R7r8Dg0finl0xWzgxoYfivSs93+2yV1?= =?us-ascii?Q?B4s3t1iJ+vRY9ZWo9S7ozsB5zY3L+hfywmn+YLN20ffgmkAfjkFDH4dv7xRh?= =?us-ascii?Q?1Sv68nkAqXBc+ymkAkOTTmbfZecLYBZfD91uc3KiWXQn03rabycbXi3lU4S5?= =?us-ascii?Q?y8uELeow7jHM8Z44cZ4x8ioFLdFc0BJoyuxWDyDxQKRHgxGx8G1NxUO+zRMM?= =?us-ascii?Q?w4tQ2zn3GzL7s9r94VroShVO+KM0pIMnBdTqcfkQJVnJHwAo5OfehAOziNP2?= =?us-ascii?Q?U/xKMV+iX5iLFKKupYfdyu5XA5X6XlD9H7iei3h23iZLQmG+WbqNLLZ+3sd+?= =?us-ascii?Q?1xp0ZnMwMhSYdckWtn9uzsdliw=3D=3D?= X-OriginatorOrg: oracle.com X-MS-Exchange-CrossTenant-Network-Message-Id: 0e301b64-4302-41eb-7cf7-08dacd8c7eb6 X-MS-Exchange-CrossTenant-AuthSource: BY5PR10MB4196.namprd10.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Nov 2022 19:54:13.2288 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 4e2c6054-71cb-48f1-bd6c-3a9705aca71b X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: dn1H1ZY2Xs9qaoY8PIH+BjrsHXOC1ICv18DqtfvvDeVvdPySlFrs7yDnooKHnmUaA4xsN9kQDZ0t+Vqubd8mvw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR10MB6300 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.219,Aquarius:18.0.895,Hydra:6.0.545,FMLib:17.11.122.1 definitions=2022-11-23_11,2022-11-23_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxscore=0 spamscore=0 malwarescore=0 phishscore=0 mlxlogscore=999 bulkscore=0 suspectscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2210170000 definitions=main-2211230147 X-Proofpoint-GUID: D_C3uVakfdRBOsPs5x5heFCBojso_s8G X-Proofpoint-ORIG-GUID: D_C3uVakfdRBOsPs5x5heFCBojso_s8G ARC-Seal: i=2; s=arc-20220608; d=hostedemail.com; t=1669233267; a=rsa-sha256; cv=pass; b=Wt2XPtNOz2jU/sGOO1CMLg6YyqERMPm5JtIdS8nnL6108mcJko8SKJgSSxErql8Pqw0HfV 74q2jIZk0g2nYgT0lZ8RCNDoaKxQ6py+DB4K7rPEcpETDvoN+VU5Hrt8CgA7qgvaNdbdrY JKHCydcP6r42T1KH1BzBkZEWELy+GQ0= ARC-Authentication-Results: i=2; imf01.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=jUQhfJWQ; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=fpIJb0uK; dmarc=pass (policy=none) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf01.hostedemail.com: domain of mike.kravetz@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=mike.kravetz@oracle.com ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1669233267; 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=8ItNy649FN2cS/hBlkmzbF78ZBWdLK5y/XeURfLXDKY=; b=Us4dV1kIfCMPDEKR6OavYzRIeXgh/rLhMVvA9DZBLfObo/rscEerdH+eSOqchL+t9iizT7 yKJLulH5UhgI+nAK9SkD8Mkq+icKLG7kGBC4yAGQkr+WmLkMal1ndi8YLqxj+nInaluIxZ czaN7EU4vziHMrw1RnEtKzt4B8YPyXQ= X-Stat-Signature: r1gwzoepqsgp6sc37sstretcmca9h1qn X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: C577F40010 Authentication-Results: imf01.hostedemail.com; dkim=pass header.d=oracle.com header.s=corp-2022-7-12 header.b=jUQhfJWQ; dkim=pass header.d=oracle.onmicrosoft.com header.s=selector2-oracle-onmicrosoft-com header.b=fpIJb0uK; dmarc=pass (policy=none) header.from=oracle.com; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf01.hostedemail.com: domain of mike.kravetz@oracle.com designates 205.220.165.32 as permitted sender) smtp.mailfrom=mike.kravetz@oracle.com X-Rspam-User: X-HE-Tag: 1669233266-597626 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: From: Yang Shi commit eac96c3efdb593df1a57bb5b95dbe037bfa9a522 upstream When handling shmem page fault the THP with corrupted subpage could be PMD mapped if certain conditions are satisfied. But kernel is supposed to send SIGBUS when trying to map hwpoisoned page. There are two paths which may do PMD map: fault around and regular fault. Before commit f9ce0be71d1f ("mm: Cleanup faultaround and finish_fault() codepaths") the thing was even worse in fault around path. The THP could be PMD mapped as long as the VMA fits regardless what subpage is accessed and corrupted. After this commit as long as head page is not corrupted the THP could be PMD mapped. In the regular fault path the THP could be PMD mapped as long as the corrupted page is not accessed and the VMA fits. This loophole could be fixed by iterating every subpage to check if any of them is hwpoisoned or not, but it is somewhat costly in page fault path. So introduce a new page flag called HasHWPoisoned on the first tail page. It indicates the THP has hwpoisoned subpage(s). It is set if any subpage of THP is found hwpoisoned by memory failure and after the refcount is bumped successfully, then cleared when the THP is freed or split. The soft offline path doesn't need this since soft offline handler just marks a subpage hwpoisoned when the subpage is migrated successfully. But shmem THP didn't get split then migrated at all. Link: https://lkml.kernel.org/r/20211020210755.23964-3-shy828301@gmail.com Fixes: 800d8c63b2e9 ("shmem: add huge pages support") Signed-off-by: Yang Shi Reviewed-by: Naoya Horiguchi Suggested-by: Kirill A. Shutemov Cc: Hugh Dickins Cc: Matthew Wilcox Cc: Oscar Salvador Cc: Peter Xu Cc: Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds Signed-off-by: Mike Kravetz --- include/linux/page-flags.h | 23 +++++++++++++++++++++++ mm/huge_memory.c | 2 ++ mm/memory-failure.c | 14 ++++++++++++++ mm/memory.c | 9 +++++++++ mm/page_alloc.c | 4 +++- 5 files changed, 51 insertions(+), 1 deletion(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 4f6ba9379112..3f431736cfc0 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -169,6 +169,15 @@ enum pageflags { /* Compound pages. Stored in first tail page's flags */ PG_double_map = PG_workingset, +#ifdef CONFIG_MEMORY_FAILURE + /* + * Compound pages. Stored in first tail page's flags. + * Indicates that at least one subpage is hwpoisoned in the + * THP. + */ + PG_has_hwpoisoned = PG_mappedtodisk, +#endif + /* non-lru isolated movable page */ PG_isolated = PG_reclaim, @@ -588,6 +597,20 @@ static inline void ClearPageCompound(struct page *page) } #endif +#if defined(CONFIG_MEMORY_FAILURE) && defined(CONFIG_TRANSPARENT_HUGEPAGE) +/* + * PageHasHWPoisoned indicates that at least one subpage is hwpoisoned in the + * compound page. + * + * This flag is set by hwpoison handler. Cleared by THP split or free page. + */ +PAGEFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND) + TESTSCFLAG(HasHWPoisoned, has_hwpoisoned, PF_SECOND) +#else +PAGEFLAG_FALSE(HasHWPoisoned) + TESTSCFLAG_FALSE(HasHWPoisoned) +#endif + #define PG_head_mask ((1UL << PG_head)) #ifdef CONFIG_HUGETLB_PAGE diff --git a/mm/huge_memory.c b/mm/huge_memory.c index cb7b0aead709..cda0ea6c8623 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2464,6 +2464,8 @@ static void __split_huge_page(struct page *page, struct list_head *list, xa_lock(&swap_cache->i_pages); } + ClearPageHasHWPoisoned(head); + for (i = nr - 1; i >= 1; i--) { __split_huge_page_tail(head, i, lruvec, list); /* Some pages can be beyond i_size: drop them from page cache */ diff --git a/mm/memory-failure.c b/mm/memory-failure.c index ae8b60e5f939..b6ab841d1db7 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -1367,6 +1367,20 @@ int memory_failure(unsigned long pfn, int flags) } if (PageTransHuge(hpage)) { + /* + * The flag must be set after the refcount is bumped + * otherwise it may race with THP split. + * And the flag can't be set in get_hwpoison_page() since + * it is called by soft offline too and it is just called + * for !MF_COUNT_INCREASE. So here seems to be the best + * place. + * + * Don't need care about the above error handling paths for + * get_hwpoison_page() since they handle either free page + * or unhandlable page. The refcount is bumped iff the + * page is a valid handlable page. + */ + SetPageHasHWPoisoned(hpage); if (try_to_split_thp_page(p, "Memory Failure") < 0) { action_result(pfn, MF_MSG_UNSPLIT_THP, MF_IGNORED); return -EBUSY; diff --git a/mm/memory.c b/mm/memory.c index cbc0a163d705..1e9f96caabbe 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3814,6 +3814,15 @@ static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page) if (compound_order(page) != HPAGE_PMD_ORDER) return ret; + /* + * Just backoff if any subpage of a THP is corrupted otherwise + * the corrupted page may mapped by PMD silently to escape the + * check. This kind of THP just can be PTE mapped. Access to + * the corrupted subpage should trigger SIGBUS as expected. + */ + if (unlikely(PageHasHWPoisoned(page))) + return ret; + /* * Archs like ppc64 need additonal space to store information * related to pte entry. Use the preallocated table for that. diff --git a/mm/page_alloc.c b/mm/page_alloc.c index a56f2b9df5a0..8eb745920cac 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1232,8 +1232,10 @@ static __always_inline bool free_pages_prepare(struct page *page, VM_BUG_ON_PAGE(compound && compound_order(page) != order, page); - if (compound) + if (compound) { ClearPageDoubleMap(page); + ClearPageHasHWPoisoned(page); + } for (i = 1; i < (1 << order); i++) { if (compound) bad += free_tail_pages_check(page, page + i); -- 2.38.1