From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM12-BN8-obe.outbound.protection.outlook.com (mail-bn8nam12on2071.outbound.protection.outlook.com [40.107.237.71]) (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 5C40D151990 for ; Thu, 6 Mar 2025 21:35:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.237.71 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741296946; cv=fail; b=G3pHjDoyRNJRzhy4bLT//XhKShsEEOZeId4+/PZIDDZy43M6jNNk0GCHacnGIk8wv4GTMJQ3qpwrS8AXcxWnOSvLU21j8RwSzu5ydnVKFy4e7AO/5jYjVhByWMMlFykppjYZ8TI3wcoISoy7ZxNkYY1fmKyIJKmWP41EZuD5zzw= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741296946; c=relaxed/simple; bh=szJ3mM/APoXc8WDSEgQWkWmcdcXZkO+zxi9RxAUeDq4=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=FY9ENe0vb2+L1ZIBm4tWNZVEnhk8HL+kA024xktuGwFrkmecqDSIloR2V3ScgEXMbgxoZ/0trQ6CO/4BbsODJUe4V02SEszq8s2zIHKi26UAo7/nc+y+LVKoYxXxoLXklPkbG5CALplEZKAdFDMMuczWREvYUchMFoi3ZcFJo9M= 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=bbJZ56Xu; arc=fail smtp.client-ip=40.107.237.71 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="bbJZ56Xu" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=BFMCdA+XnepPZ77ckMNVGQ8MoyxJ786BCx/jM9tl97FmkIl9sG9BW/YigkZ0YYBc1i6T4D880Bgqqujj7z6JNrIb69BFXTLOtGJacblB9+RCHHRInKXCB98Kjkyy5bPzi0oG+41HzP361438g/3ieTnblmHhKpRK4Vt53ZphF3m1M47XOtFVoIjIPvCo/VdAEesFwGrHluNZRmPAvyXr49xm+ymJIIfVIGRwaclLmdzyP0Olw341xsnadbmxFZKxExUNM95CBF6I9WetR+7NhSDnaqphQks1lDM2Ryt39e2JOeBOkC/Icq7uwem49TCLqfPFT8QmtBEFyaxzkWB6ag== 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=szJ3mM/APoXc8WDSEgQWkWmcdcXZkO+zxi9RxAUeDq4=; b=gavmiMiRTb3OquYJ5C58esbnZsNcfjOt2nghC+4Xia0SF+eOnIPsvUDLJw822zBia3jdUPecDa8bzTraozfIB0nF8o0MVkP3XWaswJiQJ4kIatR8Xjq8aQl0Wa/d2pbvAtCVxiq/gkZ4y8Qe4YSvmoKdx9syx1gElthl1od14KLiQ7iANXe3TiLyxij/j2l2N147mKW18TY3eVPlczRPODMu3uUVlX/U3xXGGzoUsoz2zODACpVha4jykxQTCSos6wp1pY4oxtcNnOuUR4AqIHq9xLIzzsl5rXhhONdB8or1OHXoLPmmYwv8P/Vl/9mzxjJGFyHAq0sAYAbmtXU6Jg== 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=szJ3mM/APoXc8WDSEgQWkWmcdcXZkO+zxi9RxAUeDq4=; b=bbJZ56XuGI2zsgVdTn5s+NU6Xwbj3Dxj5L2DLEfCG2T7ugIG+IolV5je60Fy85LTzHTdqjbh1lhfmkEwV62LhU5e5J3gjUteCvXhwy5zOx6wGgY8CmN3m3a6PSDyeEB3c3mn6WyVMv1kTSof+xifcl7imJ2ijVa3F+xNUXkNbpvdAfSgvIfOWwjF2LXVIARmFR2VeKwlgIUT4c5rs6Sv7Nm72c0+TU2cpwpkUwYJ/aoSFMzR+4LF+8/lavWKvXbtlsEUYCQY+AHvJP/OHxbOj9bXy8XJueiKJLLKFN2KsWgRS3ftwHmqE2A8NlTrk7AgXujz5QDOEhTATMKUw0fBKw== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from DM6PR12MB2667.namprd12.prod.outlook.com (2603:10b6:5:42::28) by SJ2PR12MB7961.namprd12.prod.outlook.com (2603:10b6:a03:4c0::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.8511.19; Thu, 6 Mar 2025 21:35:41 +0000 Received: from DM6PR12MB2667.namprd12.prod.outlook.com ([fe80::bd88:b883:813d:54a2]) by DM6PR12MB2667.namprd12.prod.outlook.com ([fe80::bd88:b883:813d:54a2%5]) with mapi id 15.20.8511.017; Thu, 6 Mar 2025 21:35:41 +0000 Message-ID: Date: Thu, 6 Mar 2025 13:35:39 -0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 24/49] x86/resctrl: Allow an architecture to disable pseudo lock To: James Morse , x86@kernel.org, linux-kernel@vger.kernel.org Cc: Reinette Chatre , Thomas Gleixner , Ingo Molnar , Borislav Petkov , H Peter Anvin , Babu Moger , shameerali.kolothum.thodi@huawei.com, D Scott Phillips OS , carl@os.amperecomputing.com, lcherian@marvell.com, bobo.shaobowang@huawei.com, tan.shaopeng@fujitsu.com, baolin.wang@linux.alibaba.com, Jamie Iles , Xin Hao , peternewman@google.com, dfustini@baylibre.com, amitsinght@marvell.com, David Hildenbrand , Rex Nie , Dave Martin , Koba Ko , Shanker Donthineni , Shaopeng Tan , Tony Luck References: <20250228195913.24895-1-james.morse@arm.com> <20250228195913.24895-25-james.morse@arm.com> Content-Language: en-US From: Fenghua Yu In-Reply-To: <20250228195913.24895-25-james.morse@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR02CA0067.namprd02.prod.outlook.com (2603:10b6:a03:54::44) To DM6PR12MB2667.namprd12.prod.outlook.com (2603:10b6:5:42::28) 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: DM6PR12MB2667:EE_|SJ2PR12MB7961:EE_ X-MS-Office365-Filtering-Correlation-Id: de8e8e04-c052-45be-3265-08dd5cf6d83d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|1800799024|376014|7416014|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?U001d2hKenFIcjlxZVl6Zjk0Mkd6eHNIMVkrOWNmSktMZDJtWWJaTHJlQXZ5?= =?utf-8?B?ZkJXeFpzckhkaWRGdG1mRlNHWmxRVDBMeitMRmVzSnNKQmtqTGZhd0puWGlw?= =?utf-8?B?bnJNdlFlK0JZMnZJL2lmTUFzRi93Mmg4RU5ZamxPUTM5QmdOd2ppQUljM1Iz?= =?utf-8?B?UnBmZmdCUlFaaC9mM0dUMlA3dGR3QWFWQ3BZcVpLUVc0d29oaGFUKzNpUG4y?= =?utf-8?B?dTZweENZRUZBQnlGS2thRjJ4MGMxWWxsTk5VYWVYUjM5bGxvNWJiZEVwWURC?= =?utf-8?B?aEZ0d1pGemFUSEM4cU82cDN1NVA0TU90S2JmQklVYTNRd0k5UmtTUDN3VGsr?= =?utf-8?B?SlFEZlF6VWdpUjZQUVRNNG9Sclc3MGpXa1F3UDRXR2xBa0hSWjNJUkpGazBV?= =?utf-8?B?MzNiZkQvV3NaMWRSbXQ4Zk9Kem9lOTI1b3BGSHNIZUFZMGJkaEpsMXFJY0tO?= =?utf-8?B?WnIxR2R1eG9jYkI4cmltWkRGUzhzZFptUUlLSlpkZXVoTmZDczE1Tm4vT0JT?= =?utf-8?B?b3FvQ1drZzRBVWYwbStUZ1JJblJuQ3dVd05ua3p0NDhpUkxIdFhZSnA4SFpx?= =?utf-8?B?RE0yWFJmdFdDMXNMaU5kM2dEd0NEVFN0d1p0Tjd1R2RCRWFiWmxTU0Z2VnFj?= =?utf-8?B?VGtKdHJYbEVCMXJHL0dpbkVORlR2TS9POTJCREpaZW1ibWc2bkZDZHErRjJ6?= =?utf-8?B?UlJPQmQ5UmpYa3AzTXBiNG1VK1lZa0llWjNxa3drT1VxOEN5RDZLK1p5RUdp?= =?utf-8?B?a1c0TDRjS29TQ1hIbWJvdFZ0UzNncGFZLzk4NWVnQWFCVGVtMFByNm5kSFZx?= =?utf-8?B?eHpUT0ROM3BUKzVYMzVEalNWL1gvVmJKaVEvZXlkL0VmN2oxblhBbnMvbVla?= =?utf-8?B?V2VsajVNZ3FqMUVYcDZhTWh0TU5wWnVJOHd1b2ZFQTNrVEZKWUxzL1RLS0Nr?= =?utf-8?B?c3VERUMwdGlJeUkvK2R6RzhlZjR6RnN4aVFtL0RIOENMalpxZ1JrcEU2eGdj?= =?utf-8?B?bWhEd2ptVWhYTWN3RUVJY291TFlLYzFtT1luK2UrTi9vSk9PNmFmK01QcUg2?= =?utf-8?B?enFXbW02b0cvNTViN2RmNUFicU4zSVU2TXg5UmVRbEJKcjlxNmdmQkk3OHFO?= =?utf-8?B?c095UFFRWlo1NTViVlE1dUhoMFEycXE1NFQyQ3kwa1pvUnJ2NXJvbHA4ZGI2?= =?utf-8?B?bWp6dXd2N2M4VlVSbXQrNTJMSzgvUnpZMDN5NXpSKyttTVVKMEFlaGh6eVJD?= =?utf-8?B?Vk5Dc2NRall3QmJqVEhuOHJHdnZmVjZzcEpOWkVZdXhQNDQ1NTdWQUJES2dG?= =?utf-8?B?SXBTWHNZQWoxcVJyaEdQaE1aaEZhalJYTk5LTENLS2hFM3dkVEZBTjNIdk03?= =?utf-8?B?SCszcVQzdHpQaGVFQlQzalphd3hoMm8xVHZjeDJnUmpROGVIZDg3ZHBrUUI2?= =?utf-8?B?WDZYRmpjeUZLM253ZFF2YTB2UDc5L1J4Z1JxTVc2TitoYVRnZWtuNU9sVXN1?= =?utf-8?B?M213QjZ5U3pVeTVEdmxYWnRGOU5BUHRZQ2crek14RzhvdzZTeFdkY2ZnYkZw?= =?utf-8?B?dEVWT0IzWVJhbXlUV0FYSk9uUnVobWFqejkveFU0ZkxTN1NJUklTaFY5VHVI?= =?utf-8?B?TTkwUHErLzJ4UFhVbFBRa3ZpVGVrTlN3WURyOEdiRHdQd2VvaTd5WFRqdGdO?= =?utf-8?B?Tk12RCtuS2NHTlJGUDIzSXltWUhBYkJDYnBLSHBWd1JBK3lCdnNwR1RyaXB0?= =?utf-8?B?TkhXRzZUZS9ySUFkNnUxeWRMM3ZwdVFvWjhGVTVjSElzc2Jpb0NCTjMxQVpx?= =?utf-8?B?TTU5M3ZoZlVLRW4raUhUTGt0Z2FuNk5zaTBEMGtESEJxWmF3SDVNS2RITWJM?= =?utf-8?Q?ogFFhv38v5Uyo?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DM6PR12MB2667.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(1800799024)(376014)(7416014)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?bGlCRTBWWmgvZ1NIQXNCbmFlSXBjTGg4UUVpTGVBQVR2YkFTZGdQQjRSZnY5?= =?utf-8?B?UTVlWE43ZnNLNm4xYUJMaGJLbFlpUHA4SnJSTU01ZGltMW14K1U4U3dKaHhJ?= =?utf-8?B?Mlh2ak9wT2lFUDF0Z0xUQ2liNzJaK2RXOGtCakIrK29GVWdraGg0dFhLZHc4?= =?utf-8?B?SzhrSjNZdldVT3pleEg5T3VNb0lRdDNOUGRFNXdhQW1RQllyU3BjQ0pCMTBi?= =?utf-8?B?UDI2dFB2aXNrQ0hZWi9KR3lXY1BLWE1uODVOTThGMjcyTHlXbzNhdkhVV3dw?= =?utf-8?B?TE5OalVwdWdRRDNMc2lLcEZUNDRwTGZDNS9CQlUzVmJkWHUzYUphdEo2aS9i?= =?utf-8?B?Q1hhc0tKSHUvbTY3dVM0Y3g3cExIQUVmQVBxYk90NGJUbk56bzdjdXVUR203?= =?utf-8?B?b2lzUjRuMm1nWFhwSm9Nd3MwRkZJeHVUNS9oYzRJY2ZHQXl3N2JLV3dhKzlk?= =?utf-8?B?Y3d1d1g1YklXbEN0alNlQlNNRlBqS3pyZWNUUlMzSDY1b3piSFdTNi82Skkv?= =?utf-8?B?MlVCTUF5eDZUbzRwWkU3TkV1SHJrbHVKeExHM2RNak5UWkNvbno5M2IwMk1z?= =?utf-8?B?VFYzT3ljSTZyQ3poMy9jSTVuQ1RReDRLU0FwSWZTbGlCaG1CTUxZejBrbWlp?= =?utf-8?B?UkMzTHE5T05GZGduWkg4WXNPczA2SUJnb0lxNms1T0lqQUhlL1Q2NlE5dTJK?= =?utf-8?B?a0Z6ZTlET01tSnErYjFLVmZjVjRIODZsS01iSWY5ZFU4K1RTTE1rOWV5TWFI?= =?utf-8?B?RndXNDFEOEJVRXFTeTFQVGhUVU5YNWdmZWFhSGM3ZjZWUmVyQ2tRZnFRSU9v?= =?utf-8?B?Z2RXNHdTaEQ4UitBcklJL05rZngwWWVveGE4cVVGREt3Q3YwZGl0Rno2dU5t?= =?utf-8?B?d1FRYTVZQ0NLMmw2WEJXM2xnRmlyaXhqTit3QXFKaEZLS3Z6YlpYYUtYS3Nn?= =?utf-8?B?UEFuZG9uRDA2N0NTbVlGSXVHMnM2aWJtQ0JZL20xeEpxUHdNM29wc0JHVTJl?= =?utf-8?B?eDExSEE5QkFkeXRkd0VIVVRsSWFOWUJQYkNBaW4xZmlnYXZvQ0dyOEFmN0Mv?= =?utf-8?B?MklWZjJ5aVZSQ1JDWFM1WmRZR2oxMzJZTWdpZkVmOFlrMzlLb0RWL2RlYmts?= =?utf-8?B?ajdLdCtOaEtBclhjaElNTVBQcVh3cFM1VnlQSkZVNTlUUEJyV1JEOHhpc0E5?= =?utf-8?B?enhxV1IwRkxUVkhhakIwRVpWSnJPN2RuM09yWTVseEdUK3FzSFlaSWRZNHFG?= =?utf-8?B?UW96bDBYU3p2b0lEQ0NLZkE2UTFIT3p3b0FZcTVGRmJReG5uNzJWcnhyb3JS?= =?utf-8?B?cWpSRUx1d1FocmhBd3V3NlBmMktUUExvbUFhbTVrVW1oSHBWYnAxeFBXQXA1?= =?utf-8?B?WnRscTFTMHYwbjlsSUc0d21ienJlVVVxbkprUkZGQWdzbFNsT1FKL2greVJa?= =?utf-8?B?NmdQZnE5WEs2NklOMnk5dUNETDduNVVuNlJScVRJMkd1L0ExMThDc29nTG54?= =?utf-8?B?anY5cUk2RmVMek42M0NpQlRNbjVFTGg3MUk2ZmhKdUZxbndsOXpkY1BVNHZP?= =?utf-8?B?N2doZStIMTMvaXRoTXh6Y05UbHpYV3JDME1lbVFVOEV0ZHo1NTBBd2tEM0dk?= =?utf-8?B?Y2pQU2w4L1cxV0xuSlh1QUFKM2MrWm9RSGMxQk16SXhLWU1sVDUyV3F0NWtR?= =?utf-8?B?MzRvSVVUN1lGQlphZCtYRVd5Q3RmbjArWGhtWUdtUHZDL2pMbGpENjZuOGVs?= =?utf-8?B?MlFraVpJd0NOa2hQWWdvOVVxdkJuL1Rid3ZTSElaT1VhdDhndGtXeGJ2VWRR?= =?utf-8?B?a3JiUmJibVBWTXhkd2JtWm9iV1dxSzNCN2c4cnZLRzQyRGkyajFhdmpPSEsw?= =?utf-8?B?MldhUGJjQk9aaUNVNG9iTkhZWVM3RUszUThCTmxtKzRqdURFK2crN3p1SlQ4?= =?utf-8?B?UmxlUzRBWUFwVEowVi9lQVU5OXI2Nk1maHhNbTBuYm1SNm56SUFISWVHRGJl?= =?utf-8?B?MGxSUHF3a1ZLRkxUS2VSYTJCRkkrMmlabVUxVDFVVlVENkp1SCs0djZWV1pt?= =?utf-8?B?VXZhL0VMc0hPanZkQW9oblBVeTlEQmk0cGhKQ3gwZDZRcG5hbk9DUjNzOWhF?= =?utf-8?Q?UAozIygR9chBfJC5o801FVZuU?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: de8e8e04-c052-45be-3265-08dd5cf6d83d X-MS-Exchange-CrossTenant-AuthSource: DM6PR12MB2667.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 06 Mar 2025 21:35:41.7605 (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: cFNVPUyl5z3GnXcIHy6Wx2BBvnhx1+Yox2XTWbhmHLEC8SXaqt16rTDAtytXYnsLob6g6nhzzk32jr3+8qzuIg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB7961 On 2/28/25 11:58, James Morse wrote: > Pseudo-lock relies on knowledge of the micro-architecture to disable > prefetchers etc. > > On arm64 these controls are typically secure only, meaning linux can't > access them. Arm's cache-lockdown feature works in a very different > way. Resctrl's pseudo-lock isn't going to be used on arm64 platforms. > > Add a Kconfig symbol that can be selected by the architecture. This > enables or disables building of the pseudo_lock.c file, and replaces > the functions with stubs. An additional IS_ENABLED() check is needed > in rdtgroup_mode_write() so that attempting to enable pseudo-lock > reports an "Unknown or unsupported mode" to user-space via the > last_cmd_status file. > > Signed-off-by: James Morse > Tested-by: Carl Worth # arm64 > Tested-by: Shaopeng Tan > Reviewed-by: Shaopeng Tan > Reviewed-by: Tony Luck > Reviewed-by: Reinette Chatre Reviewed-by: Fenghua Yu Thanks. -Fenghua