From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from NAM12-DM6-obe.outbound.protection.outlook.com (mail-dm6nam12on2077.outbound.protection.outlook.com [40.107.243.77]) (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 F327C20322; Fri, 22 Aug 2025 22:10:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=40.107.243.77 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755900627; cv=fail; b=CfCHiOzPlI1cvGvqmXH/UZ8asGz6ge0Elf2fLxFO8sWHG626pIRm8TAhjwbunw5O3ryBZCfoAP0XLB+EmQtFRgTPPL82j0MrGEuuLBXWleAcs/96en0sdg1QuerpVvHveFlPidTd0jDQYb6JYiA4ydtuyNahgAr2Pm2T/gpQ0AU= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755900627; c=relaxed/simple; bh=57fimTeWT206jgcn6DyhavDo43C6o/gCSvHF9ODp0kY=; h=Message-ID:Date:Subject:To:Cc:References:From:In-Reply-To: Content-Type:MIME-Version; b=Tu7GerNXzyFm1X0sQmChhzcNGSHh6GKdxo7UFogJVCDu0aga22GLqHOD/4jpqoP8984ebI5+sf2YOaTRF+Iw4EdQcvLJUnd3+6PLGbV0bDPi4d75sQbjBjCv374odBv/Q7ncBIex0UWxMGKPyeuABtU+6g5i/vJX7UAnZiSZQEc= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com; spf=fail smtp.mailfrom=amd.com; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b=PxrPFpq7; arc=fail smtp.client-ip=40.107.243.77 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=amd.com Authentication-Results: smtp.subspace.kernel.org; spf=fail smtp.mailfrom=amd.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=amd.com header.i=@amd.com header.b="PxrPFpq7" ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=azSLV66Go5wEk5zUYvAoyp5o9cMba+XdxLHlV937hXx4whFc71SQ+7MjF/HhYnIUyW84qKHYBXlPmojq0V2oRyfRSkdoHkZaAWPWwMrZKBqj8jfY5KFYNJn4hCiqZg5h++0u8KZx80sHU2CanNHkcB39ANpns4A4gizl3XEdCQBw624EszQAU01CHFOQzp30B2FFnd+qMBpJNQtL9EQsCmkH4ov076XFOiVf+TmpKEdD7gBR8ZEr4jVor0aoIvTuIhQstb8vfENEQ9qlcgOukY3NWacS7B38DMyLmlW623D48bRq7mbIf26H1bEGsjCDScAbwFD9/ocg73NT+eG+CQ== 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=/zXzUbCRV0IeEHA5fV1FtVGrBjHNXdVsZma63kzv4BM=; b=LpCPuRVR+fWH0g4MOxQKI685N7ojNkcZnNWg5+AUfRvkaUia0FV5mZjuiBU52yMyCe84JgbnpvPopFEOjWFRpJUpKBU04VfBhVbozGBK73HbF5epgJzoS33QBj0vQkwq7gKSZ2KcIW4wR5xAzvuGuIApr9nML996l5tRmYuOGysmrHpePV/9cJmPmq2awuNkwAknDV9rvepj8wEr6YJnhRNUKgXHKQoBTFsmd1vv78xYxmqq9K9nNtBvoPZtuwPsgyi2L/u1d3/yo+ByoioYL6b4tUrTY5gPGNol3rS+VTxFTEliv5cpiHbtVvIyz54buA1c2jubBx2pTtyHncnXdw== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=amd.com; dmarc=pass action=none header.from=amd.com; dkim=pass header.d=amd.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=amd.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=/zXzUbCRV0IeEHA5fV1FtVGrBjHNXdVsZma63kzv4BM=; b=PxrPFpq724dHpx1+nG+6grx40q4gRYjh2r7r6hrtjqCeViBVlXtlC9BavVKWypdxLEHCFxv3OtsDN62AywCSPwKEGy8qJLRvEyvUNH0c4vQfntaZXo/DtaK2QwCV1yHVfWzyLQa+Wktc4q8XSgGvE+Eefj1a7A47C0S+jVB8qkM= Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=amd.com; Received: from IA0PPF9A76BB3A6.namprd12.prod.outlook.com (2603:10b6:20f:fc04::bdc) by MW6PR12MB9020.namprd12.prod.outlook.com (2603:10b6:303:240::6) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9052.15; Fri, 22 Aug 2025 22:10:23 +0000 Received: from IA0PPF9A76BB3A6.namprd12.prod.outlook.com ([fe80::bed0:97a3:545d:af16]) by IA0PPF9A76BB3A6.namprd12.prod.outlook.com ([fe80::bed0:97a3:545d:af16%7]) with mapi id 15.20.9031.024; Fri, 22 Aug 2025 22:10:23 +0000 Message-ID: <2e6714fd-561b-4e54-a562-1c85a7933af6@amd.com> Date: Fri, 22 Aug 2025 17:10:13 -0500 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v8 04/10] x86,fs/resctrl: Implement "io_alloc" enable/disable handlers To: Reinette Chatre , corbet@lwn.net, tony.luck@intel.com, Dave.Martin@arm.com, james.morse@arm.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com Cc: x86@kernel.org, hpa@zytor.com, akpm@linux-foundation.org, paulmck@kernel.org, rostedt@goodmis.org, Neeraj.Upadhyay@amd.com, david@redhat.com, arnd@arndb.de, fvdl@google.com, seanjc@google.com, thomas.lendacky@amd.com, pawan.kumar.gupta@linux.intel.com, yosry.ahmed@linux.dev, sohil.mehta@intel.com, xin@zytor.com, kai.huang@intel.com, xiaoyao.li@intel.com, peterz@infradead.org, me@mixaill.net, mario.limonciello@amd.com, xin3.li@intel.com, ebiggers@google.com, ak@linux.intel.com, chang.seok.bae@intel.com, andrew.cooper3@citrix.com, perry.yuan@amd.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, manali.shukla@amd.com, gautham.shenoy@amd.com References: <40ffabb62f9f36aae6a8dc26e5f2e376a3dee23a.1754436586.git.babu.moger@amd.com> <53387aa7-0e72-4bf9-a188-43c0f78c2d6f@intel.com> Content-Language: en-US From: "Moger, Babu" In-Reply-To: <53387aa7-0e72-4bf9-a188-43c0f78c2d6f@intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SA9PR03CA0028.namprd03.prod.outlook.com (2603:10b6:806:20::33) To IA0PPF9A76BB3A6.namprd12.prod.outlook.com (2603:10b6:20f:fc04::bdc) 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: IA0PPF9A76BB3A6:EE_|MW6PR12MB9020:EE_ X-MS-Office365-Filtering-Correlation-Id: ea37b1cc-0609-41d2-7a83-08dde1c8af49 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|7416014|1800799024|376014|13003099007|7053199007; X-Microsoft-Antispam-Message-Info: =?utf-8?B?TU5CRzdmQXZsdUltS1A0VHNhVmZQRWRKZDZtUUh3UzF4bjd2eVREMTNOR2Fu?= =?utf-8?B?VldmTDdobjhoOVd6UVpic1htbXF6NytTUXFYMy9UcnhQY09odkR1MVRaUlpT?= =?utf-8?B?WUJvQkNxRHlNOTJsTGhvV2x4N1JYVjJHNGlVZy9SVmlvaHpZOWI0Q3dieGFC?= =?utf-8?B?T3RTa1kyM0JuZm1zVkljY0tSWWpxL1VVbUJMbHNjbUF2YXVVNDZ3dzlkcDU2?= =?utf-8?B?aGg1WE1xd1l4YXY5YjQzaHM5REVhRDZRTHRkMUFCaS92aE9rRmViR3Bsejds?= =?utf-8?B?eXBWdWFERFRJYnBVTVJGSVRGdmhaSlVsTDN5a1hkLzNKTUlYWDlqNXMrcjQ2?= =?utf-8?B?YlA1Wjc5Y0xlck4xMTV2aW5kSVlDUmRwaFZWbmxyMjM3Tk5aMzU0RkY1bk83?= =?utf-8?B?a0EwYkZoc09kc2VoZlRJNTU4dVZ2aDd4NHBlQ21kSXp4MEZSRDEwNTFZQ0s1?= =?utf-8?B?dWhnUXhpcnVYVGcyTnRKNy9WY29vRURzR2ZJYmorRHF6NmVlbUdrbGQ1Yll5?= =?utf-8?B?cDZXVnhKZjdTOERJcmp2bTBOS3k2Nnp2YVZ5OWRyQ2lqWEtuMGVUTzh0QlRy?= =?utf-8?B?OGNaWnNaWFYyRUFNSWk0aEl4MURlT3Q0RkxsV0psN1gvUW81TjlJVXRGMkRk?= =?utf-8?B?YTQrUGxRK0pOek5YTlpMRngydTZNL1F0MjVOUncvL3Zsek8xcjI1NkplTmNW?= =?utf-8?B?eVU3QWozaEx1cGZCQlRFckNEb3VPREo1NE0zME9mUTdMbldYdlR3bFBROHRi?= =?utf-8?B?eFgrcytMWG93MFJwZXBqcjdwa1dLTGNhU0VCNktud1JHaHVvR056L1RmWUs3?= =?utf-8?B?V3F1ODVUdlk0NEhicS8rZDZOS2xtZUk1Y01Gd29odmIrVmR2N1c4MEErZTRJ?= =?utf-8?B?NHk0L0lZR0Qwa3E4am8yMXVBNlhZaVpHbkZWdmNLZkhKQjVWTDEzd0hUZnFE?= =?utf-8?B?NVorbTl0bERjWGpzQ3VPdzJZSTlOSFNRSndRckFlaFF6dGhka2w1ck9ySjFo?= =?utf-8?B?ZGxUUTQ0QWZDL2ZJYWpOS3gxK1laY0FHNUgrTmFlVncxTHpZUExOUmwrSWhQ?= =?utf-8?B?VUZUTnZqQkJHemp1cFJycklLdzFDSHJGVTRwN2RnTzlnR0lSdUtOUFBmTm5H?= =?utf-8?B?MUhOaHhBd2ljbzFrT3hoeWlOLzJ0bFRlaFF4UWFXWVFGeDdoVEtlRVhKRlgw?= =?utf-8?B?YmRhUHdWTTZYWDdhMmxiN0FvTjRYZVFiTUMzQnIzeTFMNndsMGRobTQvUlFB?= =?utf-8?B?U05BVGNsWDJsbWh1eXBIZE1tVU4vVkRJdFhhQXRxSGc0d1I2WWUwRCtHZEJK?= =?utf-8?B?WDNxakl3NXo3VkZwNGI5cDh2U0ViaW9VVFBMQjkvd3VTK0xCZmFybGUyTWs2?= =?utf-8?B?OHdwRmZLcWp5aUsyeUZnYlY2YlZGRnRlTEMvYklRVWxXWmppeG1QaGpHb1lq?= =?utf-8?B?M1RGOUtGL2lsclpYSjhaK0x2dThKWklzRmthRFhNL2ZpQWdUT2tPY2lTaFNN?= =?utf-8?B?Vmt4Y3B0RWowRlhlRzBqSDBteDNoSlNJZ01SOEZqNUo0cFl5VENTRVNxQ1JS?= =?utf-8?B?V1Q4U0NQcG1HMXdEbGREZW1hdnVpbWYyaXg5cjZoZUx5YTlUdUdMaVRaTGhO?= =?utf-8?B?TmJHT2pIbjMzV3NlOFBaVjBMWnBYWXZKMlczdGV6Rzllc2txL0JlcExHWkVK?= =?utf-8?B?bUpvZDZRS21md0R0dFluSEZZTTRqQ0w2QVNuRzd6UHdNc2szNm5Fb3pjTThv?= =?utf-8?B?ZlpISGlLSTdJSENmLzhrOFMyYzdxaHd6Rkk3eUNRZ2xkSmRtYmpnNSsrTG42?= =?utf-8?B?RkZkMG9za01PWUxMQ1NiTDFsbkV6c2lPUnljT3B6TGFTdGZyaE5lOXdVZW9I?= =?utf-8?B?WHlXeUsxNUUvR0tHOTNnaFRpbDhtOW11OCtSbk1NUmI0YStheEdqOUxiZ2JL?= =?utf-8?Q?ZOTrW1aIMTY=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:IA0PPF9A76BB3A6.namprd12.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(7416014)(1800799024)(376014)(13003099007)(7053199007);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?dHBNZldYWndmdGIrYld1b2N6b2Z1Um1LOGk1U0ZNK0pVWWh2OCsxY0dnTDlZ?= =?utf-8?B?Yml4aFUvU1ZPSVlDOEkyU2t4Si85OCtJY3dXMVRxa1hDNzF0d0l3ajhsNDdO?= =?utf-8?B?cXRzQVptVzMvcy9LSGNpS1Y4ZkhMdmZHSzlEdmowclpPMjdiQ1dFeWFvS1Aw?= =?utf-8?B?NFpxd2pUSTRUVEozSi94eVJnVllKbFp3SFZvNWZ4elIrWW5SK3RwdHd2TTNQ?= =?utf-8?B?dVpjbUxuK2pySWNvQkM4WnM0RW05SXJZdWYrZHU2bnlhUm9GWnp1ek8wdjly?= =?utf-8?B?MFhaV09HNzl1M2Iza3FiYzhtVnh0am43NXdTeEh1b0tod3BlWVo3eUxxcWpL?= =?utf-8?B?N3N4bTBDQnB6UEozR1k1aURqWWUyalFRUFA3dkFrb0ZqbnZhVlNTLytPMlRy?= =?utf-8?B?VG1vZWg4Q0FMR01FeC9NZFVsT2lsOXVDZk83QnJ4aXRJZndieW05NkdsZ3ly?= =?utf-8?B?MmREZXpSbDRjWWc1TGptbmEvNm1IRlBXaWxzblRiQ0tGT3MrTlhZV2FiUHRF?= =?utf-8?B?S0I1VnVKVzFJRmZIY2EzQVNDZm1IZzdkNnYzYmZ6ditTcXc3QzY2U0V5QWJk?= =?utf-8?B?UTY2azkrdUNqMnc3UGZVM0dac3E4YVY4dXN4VjJuMDFTZEpQQ05KSTdRamtp?= =?utf-8?B?eEhYNk02K0lvYm1iU0lqeFFaTXhvSmNqYjZoaXlveU44ZU9BT05QMWdiOXdu?= =?utf-8?B?ckczeGE1OG5EYnBaeTNVK2N0TjZjcU15NXlqZHhrOGlFcEdGRW5xd3M2OXBC?= =?utf-8?B?RVdzYlNTQktwM3A2cnp0Zmh4UnFrUkJKNFRSa2N3R2Y0b1hvaWo1T0NFUTVS?= =?utf-8?B?bk54SEFlYktsOEF0bWVTOFpkTWg4MGNKakFRNFFoL1ZsRnZPQU9vSWxtb3F1?= =?utf-8?B?ZlNzT0hmbTNaMFgranJoVjBYYUJxOWRnWnZwcUhNVWpGYnhSVXplMEVlQVpu?= =?utf-8?B?blVnQkFzU1hSRHBlS1FNeVVOQzRjQkZYLzFCMWlyL1U0M0RHY3M3TmpPK1I3?= =?utf-8?B?OTNhNFpjS3AyY0dyZGpTNzM2Vi9YYjlYN1lTdkhsRHcvNks4Q1FoeDIzdU85?= =?utf-8?B?OVBabTFXc0ZYVTFabVZRcGh5ZW01Q2tTSURDZ3creGxiSkZBT1hHdmN4eG5y?= =?utf-8?B?R2s0UmJyVGhHYjV2dHpHd0JFL0VaZjl6b3VKMVZVRndDYnhyWkZnUUtTeHlQ?= =?utf-8?B?YXJUZyt4eE9mVmVRRG94dlpkMFMzcHZxcTZGV24rQWc3SGh6SHJnN0JrdU5V?= =?utf-8?B?OCtoaVJYTzVSSzYybGJSZndjOVBUQ3l3MzFqQmJZdGhyZk9jQmY3SVlPY3BI?= =?utf-8?B?cGNnNC82Z21qMFdMQ0xsUko4YjBWK1JBQjhtUk5uaFRBVGJubEpEd1BIWG4y?= =?utf-8?B?TzlLSVBGamdEa3FFWndleHR2NnRuZHhvQXphT2tsMWJDS0x1YWJrbTdMMkJD?= =?utf-8?B?ZFZ5aEpIbWgrUTNPQVdsTWV0MHVhZlV3VlJOVmRMOUF2YXpROXhoekxkMjl1?= =?utf-8?B?R3BVbEtyK2N4R1J0TkJ6bEZNeE1VTm5Od1dLNG9nUkxpTkNFU2xINWQwb3Rw?= =?utf-8?B?ZFR6cjdkN0xrb2V3WkVBVEgxREx2L2x6UmxmQUw5RE8wMU9VZjJnczFQWk1k?= =?utf-8?B?eGJvSlpEZXpmblV5YiszUVQ0eFVLWGkvNURMN3VlMWZRcXdONkFLdDRuN3R0?= =?utf-8?B?WjdZZlA3YVplblMrVkQ3NzR5UDRubXFEU28zSnUzelhUSnBJaVhNd2FDQlNz?= =?utf-8?B?TTJjZ2ErbXJ1Ym9LdUZIMDRFMkFyaEp3azM2SjV6WjlQd1djYk81bm40Z1dj?= =?utf-8?B?MzkzSS9lOWsxR2FxRHBnVXNnSXNzZVJlNWZYNkFhOUpiMHFCQ0U0dWljREZ2?= =?utf-8?B?YXRkd0QyZTRRLy9OMHpRR2RYYnloa3ZSOUtrbWdUcHRmM0ZRTUpEelVpMHVl?= =?utf-8?B?amZwbC9KWGc1UyttNndHTTU2Q2lwYW5KcEtMVDczRUd3VzNuSGhmTG0vejhH?= =?utf-8?B?T05iMGtaNzZ2eVlETjIvdmRrSnl0dHBPaGJpNEtFV1FzS0M2TUhIODdFNldu?= =?utf-8?B?Z2hucG5wMFhQM1VxaEdpRGYwVXpKS3h5MXJ2YWUzamo4V2ovUjdmcmR0dU0z?= =?utf-8?Q?JU+E=3D?= X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: ea37b1cc-0609-41d2-7a83-08dde1c8af49 X-MS-Exchange-CrossTenant-AuthSource: IA0PPF9A76BB3A6.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Aug 2025 22:10:20.9837 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: UCV5ohWIUlkILHeA3kL/put1DmrpEqkH06yYoHLtDAaYyTEdmmaWfw9DYAh61Qb2 X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW6PR12MB9020 Hi Reinette, On 8/7/2025 8:47 PM, Reinette Chatre wrote: > Hi Babu, > > On 8/5/25 4:30 PM, Babu Moger wrote: >> "io_alloc" enables direct insertion of data from I/O devices into the >> cache. >> >> On AMD systems, "io_alloc" feature is backed by L3 Smart Data Cache >> Injection Allocation Enforcement (SDCIAE). Change SDCIAE state by setting >> (to enable) or clearing (to disable) bit 1 of MSR L3_QOS_EXT_CFG on all >> logical processors within the cache domain. >> >> Introduce architecture-specific call to enable and disable the feature. >> >> The SDCIAE feature details are available in APM listed below [1]. >> [1] AMD64 Architecture Programmer's Manual Volume 2: System Programming >> Publication # 24593 Revision 3.41 section 19.4.7 L3 Smart Data Cache >> Injection Allocation Enforcement (SDCIAE) >> >> Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 > fyi ... Documentation/process/maintainer-tip.rst has some examples how > the "Link:" can be associated with the changelog. For example, above could > be: > > The SDCIAE feature details are available in APM [1] available > from [2]. > [1] ... Sure. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=206537 # [2] > >> Signed-off-by: Babu Moger >> --- > Reviewed-by: Reinette Chatre > Thanks Babu >