From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM11-DM6-obe.outbound.protection.outlook.com (mail-dm6nam11on2041.outbound.protection.outlook.com [40.107.223.41]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 288C42750F4 for ; Fri, 5 Sep 2025 18:44:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.223.41 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757097862; cv=fail; b=LO0Vn1UsveG+fzymMR4cSa6W4woeYQvdzb1YxIrEVWRi64o+aVMGOXp6JaMcCZsmXdXIhyB42giYSB+V2BI18UBWp/HxbqeOataZUzxbVLd66IfK2fWNz2O8MMXpqHvF77b4WIVABndYSgF668GimQ9g3EF00PwEPJyXOBdR2bQ= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1757097862; c=relaxed/simple; bh=H9nw5+T3K9W5aC71FjONIC0ubJgpxrDL0s9P1DTuG8o=; h=Date:From:To:Cc:Subject:Message-ID:References:Content-Type: Content-Disposition:In-Reply-To:MIME-Version; b=YoBuJQOpsyzBadJtyKFZP888uliHKYPZqBVQSMT3KiqJEIMN2uLvQnLdSaur8HOU4gFIe0bG66dJaBkCg7UR9MnRYA20LjpIw8u9wl0Rc2Lin9819+1FlsCiSFyIzY2v8SCGR5vDrEs609QHoigim9NdXp05hsb/qX438NJppIc= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com; spf=fail smtp.mailfrom=nvidia.com; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b=R4JecepD; arc=fail smtp.client-ip=40.107.223.41 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=nvidia.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=nvidia.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=Nvidia.com header.i=@Nvidia.com header.b="R4JecepD" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=PVjMVtuOSzczEnBz3PWw8qoIGGupWc4CsNjLbz6XcPfWRuvs7uaiL7m9/Cj+Smvtbg8kZZKS5IbwugHnk/ZjhJi7DDH8AOZzJSCrlAZ/F6jDSL9oZxeVWsJD2Eq9/0bli3I0KX5/pLdttnzOg38FwNxSVD672vfs/tWPDRNZjnGRzUnQ2D+7OAXLBNaKT2EBpdDMPAiWONyp3Y/BeBwXw78xE5SWLtSeeBl5SKIJ+ENEp0fjnAJAi+9Y8+2K5Le0P2AinWo/0CSCR3OoHE/yxXjl2/nXad0BFTij8cYujiRiaZMZpyOEirZQuEOlItW15MLgcqoYVAipl9sVNBwjag== 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=4llOfeMloJLZvAtdaLCf3floVPmVhmv21Jrv7w503oc=; b=vzddCxYtglzpjfsgQrJ+baj3duVWaKEjNP1oAyfi/NUfnoHy02+gyTRlb46bnwAIad3pB0xBncIEEIARszoIYv0txjow/RWBj2VudND29Vkh0JJF7RD05f0pFzRSfBI7p/DEV8zB6uNv2eq4bEvu2v5aOFRkMHx31YWH8ckEy50cgjBUJekNvl7YI74VQToQBxUx/Xkk62OtoHI3AjhQQ2bq3MVEwSH9rGVbRjfqmfRMGWF11SymRWCuHND5S51NyQY0x5wdE/jABf2NJ9g9mRoIL1/1dacEb0Yoyfrm8jH7mpAo9H5+8obDT9hRZTLFA9dSqA/q7CjBL2f7EmlsKw== 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=4llOfeMloJLZvAtdaLCf3floVPmVhmv21Jrv7w503oc=; b=R4JecepD8A0IbNJqzX3XihscRfOwG7nP4Q+IGM7VOkvfhbOu/v877Gho+TfpMq9Kd4/DSRWBFRUdI6ZfGD2Jpj16HScTyvtB7jxfsa5P2CPmSLRKtAnNDykFbB+zzEoGwao5MMG15A/92iW2AajVe8u6aApmbJOrvqPI0cqTkGIqlzeyU+4u3ZP/gh69n/4uDT2iKL8guqjDcsh5wf0r+rP95MwToEP7atnt0UlWPW++Yh2PK1K14sSs7hF2I6hYpi88lekS5Olk9Sh8gN1ZeW/XqIYYPuec/vS02y/dGzfcOp4IpKutJEsJDROB8gzjm0pLGajJM0acb8mZKK4VaQ== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from PH7PR12MB5757.namprd12.prod.outlook.com (2603:10b6:510:1d0::13) by BN7PPF8FCE094C0.namprd12.prod.outlook.com (2603:10b6:40f:fc02::6d8) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9094.17; Fri, 5 Sep 2025 18:44:11 +0000 Received: from PH7PR12MB5757.namprd12.prod.outlook.com ([fe80::f012:300c:6bf4:7632]) by PH7PR12MB5757.namprd12.prod.outlook.com ([fe80::f012:300c:6bf4:7632%2]) with mapi id 15.20.9094.017; Fri, 5 Sep 2025 18:44:10 +0000 Date: Fri, 5 Sep 2025 15:44:09 -0300 From: Jason Gunthorpe To: Lu Baolu Cc: Joerg Roedel , Will Deacon , Robin Murphy , Kevin Tian , Jann Horn , Vasant Hegde , Dave Hansen , Alistair Popple , Peter Zijlstra , Uladzislau Rezki , Jean-Philippe Brucker , Andy Lutomirski , Yi Lai , iommu@lists.linux.dev, security@kernel.org, linux-kernel@vger.kernel.org, Dave Hansen Subject: Re: [PATCH v4 7/8] mm: Hook up Kconfig options for async page table freeing Message-ID: <20250905184409.GS616306@nvidia.com> References: <20250905055103.3821518-1-baolu.lu@linux.intel.com> <20250905055103.3821518-8-baolu.lu@linux.intel.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250905055103.3821518-8-baolu.lu@linux.intel.com> X-ClientProxiedBy: YT4PR01CA0475.CANPRD01.PROD.OUTLOOK.COM (2603:10b6:b01:d6::12) To PH7PR12MB5757.namprd12.prod.outlook.com (2603:10b6:510:1d0::13) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PH7PR12MB5757:EE_|BN7PPF8FCE094C0:EE_ X-MS-Office365-Filtering-Correlation-Id: 9dc9899a-ea01-40c5-72b2-08ddecac33f6 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|366016|376014|7053199007; X-Microsoft-Antispam-Message-Info: =?us-ascii?Q?nrBlORyPbLPzQPsRsxC7B21Kq4/RapMU8pRw7+QasIoB/tvjvx+hPL7YNMyW?= =?us-ascii?Q?6H5Z6XoLxLWDN+kvQRa/aNj/M9sVifQhc+ptYdYT402ZhkvKk0+BBP4Ruaa5?= =?us-ascii?Q?t/BaHeUWPKNRs3G8WDnFA2lUZKzzH5oTPflGCaj9mfxGfeDWcHY4dhQ2rkev?= =?us-ascii?Q?l/XTiUY9fboEaVNyxdRZgZBIjcbJkQ/ibgKr5R5dS/ibUmrxzmWysr6lUYSS?= =?us-ascii?Q?RxJ8zkM4wDXqbBJPQJFlE1DzIrX8RcUqqMi1rHdegwIduzirNMk7hWWGqjiW?= =?us-ascii?Q?YWPzUyVv1rYVwUubc5zddjCCsYRY3mw9WG4d17XHAoopLcBSp1UU3AnIfdIS?= =?us-ascii?Q?mlRHcnibnqM3cz461FnV/AOOu8Kqft/JNY18q6eqhkPV8CmuMXZSsp6ooRkZ?= =?us-ascii?Q?xY1wloJDxAKrZ3KF9X7nRRRKTdZaGEoGqGOU0t3VEXNFHRjSLoUKfD76ee0M?= =?us-ascii?Q?m6tYlUPYW7UlJSD12molfdATgGqC2nJIoMWEZUJ2Oqce+W8bEH/XJ459cHKJ?= =?us-ascii?Q?AurCMQbFGgzIXBcljo97kayON0rj6QLIJR272Bd5eO/0415zSAKqsgLTZpVO?= =?us-ascii?Q?kNukG6zudreTuad8gtFXgsyw19eRFkxtAnMhBpk+A4httLAxYxxzRQY05kpm?= =?us-ascii?Q?+WeW89+blQ2Z20GtD7b18WZ7uaP5H4HD0ke3pQSi9Ewvw508uBCHoDIMvVHv?= =?us-ascii?Q?slTlpvbz2LsYXbQ7w0i0NS/oh0k3pJn65y3z5cPRevs/zKHYiQiBSfPl/hGo?= =?us-ascii?Q?6VFH1rEVddP9yISknalpPBY9iELAOfQEzV7zb+JwCgDlmdjWwnJpKm1lYcLq?= =?us-ascii?Q?Qy8hxaYm0l2JiONUSAN339DWh9hsT42lif4SO3kUBExWUr4CxrlupaA3z4s0?= =?us-ascii?Q?AoMWRofIS8Ph/eaq/TfgAyEe41P+2QCT7x2bmpyU4PIdafkEBW/mBY77Y9aw?= =?us-ascii?Q?ZGLEXxc/7vnPn6y2XFnTcBFSiXwlbj248JXg4uGe4oVWaPIncrakvgjFCSvR?= =?us-ascii?Q?+RDk+jnxwzWO+5YI2w2vNjippgBwxc6OZv5tqN8JHaFPk2dMivHWBKhkSPSr?= =?us-ascii?Q?by7tRVAJDYl5k50bqxl9l+DgvauuDOocD6E+J5GhlC9dugZm/i5jkpyVuKF0?= =?us-ascii?Q?F1iNh6+G062YtXZyq+HhfuHCRwoh2ntZ4BAUKuJv7VRrhdim1M1Kht/3Kepy?= =?us-ascii?Q?cBCgYcKvZ2l6ckZbBCFh5t3bXsKTyDNaYPESRKJIN8WHfQXXL+4JVXYZj0kC?= =?us-ascii?Q?3DXPI8G74H6BZQCn0kpGRLI4gZOqVNTygVDonKkKa65b+E1km8AppY7dJCTe?= =?us-ascii?Q?A2vOm8IQ2BGp0I6xzHjtZi5cF/TJVPssfJxb+SMjXVavD4tKhRIRbJxYWKlF?= =?us-ascii?Q?TrqiOVEjsMDlWXeZKmzPAoN95bNKoe7yScSy2QJkickD2cZGaA=3D=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:PH7PR12MB5757.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(7416014)(366016)(376014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?k68bctgVcstYXos5RQTqV7Yc+UL54u0OvZTbCahvdvzE08NbAbIkTqtaSSxK?= =?us-ascii?Q?1qL/bt9sPAcZFUNsIygae+/VKcHZyihF4e9uzOEllCSi9U1uQ7/QUhZIs1pf?= =?us-ascii?Q?fIW+Cru7mge/0oZT61n8KkPNdWtcFBoPumGV5haThenJdbwjhrMkmNAc+C9Z?= =?us-ascii?Q?MMqi7lkjwNQDpt4Ti97eh980VvLF9tN1k+lT7Fos+q38TVqloXRB+FIYO+AW?= =?us-ascii?Q?+Q9P0jKKnpyRsdEkXMrm24wue1OFDs31IpeOaT589hsjw+/cBtCZO1bdQNVx?= =?us-ascii?Q?dcZdH7+B5aF4Z0FdGKLXnPC9fGRYmTOk8RHydf6EfkvqGdi+/FRxIZSFxyCg?= =?us-ascii?Q?Q4JiDoUM51+K6K44Z7TKAb4nS8xmtMw/N0ev5QLKFzdexaTOB7oVwov4e656?= =?us-ascii?Q?XdX8XuGzL2FH6gfsh2RNfM96T0hCLMy2JzNmrdOCJPewXM1wy6by5Bdk1UZg?= =?us-ascii?Q?XAz6pPDun4gv7IfXOGCLokT+cu1vPOQVz3f57D/y9XkQ966r90EtS4KPjEs4?= =?us-ascii?Q?kfj89SxCJDeRM5P9Vacr1YkdHsPVv+3949K5H3AuzVBAu8TVyJcpa50015SQ?= =?us-ascii?Q?qiR9h89lNJ9p40oiwFb+0ir6OtDatT3EjWPetXObEC9d+pvVNi4LQblNNxwZ?= =?us-ascii?Q?v4Kt/Ip4j9mzFfBEXBSLn/FLKzKitLZ+DuvBA9iFTzt7fORUDBMbKp1MDJ/1?= =?us-ascii?Q?odvAu4PAlZcys1o5d7S76SQi0wbyy5CtAQ0fTFjP+6kjyJxFkw/BEbHGRsjP?= =?us-ascii?Q?79NDMuzJN/sF85YwSTaJyvQoIpQlGoMowx1Ff7M3XCsKrSaSZFV79dN/2jJ0?= =?us-ascii?Q?xuRKXTludSKJRrxb9+PF/8JenZ1jXCk1Lggcwyz5zK5RuDzD2g3bz30sb/vW?= =?us-ascii?Q?9n44xGLHbR4JjOqrrBxmxB5fUZLJqxEL7d5iJBi2REgg0pIYa8uguDA4paAl?= =?us-ascii?Q?Bx+Vy3LcTZP754/4AdoXuiFez9sGrTOmbuJRdfYufWs0Pl7hHsdDX9//WQzL?= =?us-ascii?Q?I6uigvP+3H4K/3pBUhu2eR6k36O/SsWHj/wPqQzLTnogj7QPV0+iT1J3OnJz?= =?us-ascii?Q?I9mrDxAQcT5799U47PDxhelsGP9aKOhtKb65rnzKA2XIaVBtCCbIap34hi2R?= =?us-ascii?Q?wDlgrzjALodhAK6rl/jquXRLP2zfRzjl5Odx8va/mjtDD6k26ZdvxV5PHIfw?= =?us-ascii?Q?Flrcaqf9O9erTz6nXkO/xwoFAJxJz4zmqfLURaaa/xQu3aSRNaG0o+AiXpto?= =?us-ascii?Q?kEeHv+DUP19rw2jnztWQ4QtLnNpenAKLxX/7hCbKLYAYjQ5sU/RkMgZQZwl4?= =?us-ascii?Q?Ny0U+K5wDliggcWkJXJs07kFxOji9mQkgxz8pZvepNsWDThFNX8eblcTo56v?= =?us-ascii?Q?orTmnG639UfEvqNCHhqAzleCk7AjWbsNBDWJ73EJh/0KtCKau5ngNNiEoVbM?= =?us-ascii?Q?Zzrf5OVM4qBk/b5kGCTzxsI9XC/Hu+tRA28HIEr+S2igdx34nSA3FYaKahQr?= =?us-ascii?Q?iL9sxz9fIfZSgZD/RGi14Qew/bjwwbrgfKST2jECY42TKjLdIVsJRT6zzcyz?= =?us-ascii?Q?TPQLFWqUUGlU55shD84=3D?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: 9dc9899a-ea01-40c5-72b2-08ddecac33f6 X-MS-Exchange-CrossTenant-AuthSource: PH7PR12MB5757.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 05 Sep 2025 18:44:10.8353 (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: NroE8KQlSmGeo9m2lEumfnfUkqHlGlKHaQzQnzD6TXLRwtkw64WqAIi51+jL7SyK X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN7PPF8FCE094C0 On Fri, Sep 05, 2025 at 01:51:02PM +0800, Lu Baolu wrote: > From: Dave Hansen > > The CONFIG_ASYNC_PGTABLE_FREE option controls whether an architecture > requires asynchronous page table freeing. On x86, this is selected if > IOMMU_SVA is enabled, because both Intel and AMD IOMMU architectures > could potentially cache kernel page table entries in their paging > structure cache, regardless of the permission. > > Signed-off-by: Dave Hansen > Signed-off-by: Lu Baolu > --- > arch/x86/Kconfig | 1 + > mm/Kconfig | 3 +++ > 2 files changed, 4 insertions(+) Reviewed-by: Jason Gunthorpe Jason