From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.13]) (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 459EA1FD4 for ; Thu, 26 Mar 2026 02:04:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=fail smtp.client-ip=192.198.163.13 ARC-Seal:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774490674; cv=fail; b=bmFWKyoIO594MwzprM3ol8vm0a605tXeStWLhjnHtvmgopnmjulU6nex0ioxg058NCWDVtsfhfDWSGrvQ+vLhEnyiNviQ5ue5NPgz46qo8pU1aK16kmCtVRK3E7dDyDOAFf0MbMBH3m9hbMLcPDDzxrmdLebDWL97W/DL85TMfE= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774490674; c=relaxed/simple; bh=JUHZ1buOUWHdCjsvcptW1PuD+daJnZ2jKGIT0pRGZS8=; h=Message-ID:Date:Subject:To:CC:References:From:In-Reply-To: Content-Type:MIME-Version; b=b3ShicxqZe4JOnow2AZEj3LHSIYM4c5//7wuT3+3qVXklNXXnhlHhGOqN70vaHJMfl3rlYTIN3sHVfRI+6lEWfyt7k1dQhSAdTBnl0ASztIsOkyFtLXhmof0mqLXIhQzFZyafSPwa7aHSrlIwN14LuLse0qB4+Ns8OshhJZMJQQ= ARC-Authentication-Results:i=2; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=OskSTuXf; arc=fail smtp.client-ip=192.198.163.13 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="OskSTuXf" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1774490672; x=1806026672; h=message-id:date:subject:to:cc:references:from: in-reply-to:content-transfer-encoding:mime-version; bh=JUHZ1buOUWHdCjsvcptW1PuD+daJnZ2jKGIT0pRGZS8=; b=OskSTuXfyA6RzExXHg3Dx+0NolB0xl+ki+WcIkC1FvscqujHRvN9PevL YBUQ8L5MuctpRcY+sVAlz9RtCrWP70P7f34ffI2W+k6g6gDB0xHc9BIXl HioM7qhSSQQL4fxt+KBLkIXVpKON3KoFR/Yj5z4O99Umm5Ow6lA2yU3qa AQQWQHvyJpQAIDN8nSIwoGWGP6AUPgackgRAHP2RWIBvDghWyO0X6BfPX V7Z7aETHBjNoQCoc0D6wyusLRrnueaKHbA1dw94TlsT8dF2Gnh8pRIgNq EwrvoPX6wZgqQfZnTTM6/hEJoFvmk162RhgkvQIbrvUcUbJpVAtVij8R2 A==; X-CSE-ConnectionGUID: R6ZTTukiRtiL9kgO2vWAOw== X-CSE-MsgGUID: Dql/2m0fSk+8rcg3E2oyAA== X-IronPort-AV: E=McAfee;i="6800,10657,11740"; a="78138018" X-IronPort-AV: E=Sophos;i="6.23,141,1770624000"; d="scan'208";a="78138018" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2026 19:04:31 -0700 X-CSE-ConnectionGUID: sTymgbyuRQSQ+s2OLvIRkw== X-CSE-MsgGUID: xwhg+UQ0RLODiK/tOyOQQA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,141,1770624000"; d="scan'208";a="223916640" Received: from orsmsx901.amr.corp.intel.com ([10.22.229.23]) by orviesa006.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Mar 2026 19:04:30 -0700 Received: from ORSMSX903.amr.corp.intel.com (10.22.229.25) by ORSMSX901.amr.corp.intel.com (10.22.229.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.37; Wed, 25 Mar 2026 19:04:30 -0700 Received: from ORSEDG903.ED.cps.intel.com (10.7.248.13) by ORSMSX903.amr.corp.intel.com (10.22.229.25) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.37 via Frontend Transport; Wed, 25 Mar 2026 19:04:30 -0700 Received: from SN4PR0501CU005.outbound.protection.outlook.com (40.93.194.56) by edgegateway.intel.com (134.134.137.113) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.2562.37; Wed, 25 Mar 2026 19:04:27 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector10001; d=microsoft.com; cv=none; b=lJnu7rVq2aZl3GK2dOc+ljOu8V8JM2v7os4u9V1WpXsGKpp7EC1trwBEh1e/yAi7F+XgGC9wRortI+M+6+gpXRjGjqTs/i3B3iZ2M09zUo+pxVqKs7wuOUQhII4laRfpJG7/jNFFX9cBA+IqXQ+lNgWmH8I2wu4J/2rBYcdts4vOeWSFaecASPPJa8mGQXHeF2RZiaPS2aPY9LYFQmxGS4H3z2mil4CB5SaaYqVAgLQrURnadfEvR8NSVbXE12Yv2H2aKcaQnGk5VmYsAufZwbneCT77Oj/4LJ5ZfBqW6arjMesS/P5lvWwK3hTJ+OomMxyd9WAlYgTO0NVlNS8tNg== 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=BzxqSM+/qHJi4kCc+EmWjoH2o4Wf2WeL3z/KCWpRW4Q=; b=iVhv636/0zy/lz2dtaIzi0Y7QTZtPiAZu0149O2lUWLpU4a94had5ewaVR1ZhfT+7wwe8pV+0Furwvm+ukbESuDUoQGA/9KvFawONdpQfy1yqMJQ/zK0rle+rnYXThFgvksFyaZkP53eU4zzG8dWwodGi++22xxx5zjm/HI32p4Fbwk+Q3xMOjA9cuA4eWaL1Na4GaJ7NOi0XJc/R2lYVhOPTi+t0XqE8TiCEVI4kLHW67aeHtx5qzbNQ3VO89dGFj5eEbe6JyGYPaAk6FG41AMCxrPA5q1yJNQ2NHRM7EBOTG2jw6Ny23tFDyZOz9Pmqzwr3VI7WfJRsdZrGyh71g== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from DS0PR11MB7997.namprd11.prod.outlook.com (2603:10b6:8:125::14) by IA1PR11MB7200.namprd11.prod.outlook.com (2603:10b6:208:42f::11) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9769.7; Thu, 26 Mar 2026 02:04:18 +0000 Received: from DS0PR11MB7997.namprd11.prod.outlook.com ([fe80::24fa:827f:6c5b:6246]) by DS0PR11MB7997.namprd11.prod.outlook.com ([fe80::24fa:827f:6c5b:6246%4]) with mapi id 15.20.9745.019; Thu, 26 Mar 2026 02:04:18 +0000 Message-ID: <37dfd1fb-991b-4c1e-8b50-8220a9f038fe@intel.com> Date: Wed, 25 Mar 2026 19:04:16 -0700 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 1/3] x86/fred: enable FRED by default Content-Language: en-US To: "H. Peter Anvin" , Thomas Gleixner , "Ingo Molnar" , Borislav Petkov , Dave Hansen , CC: "Peter Zijlstra (Intel)" , Kees Cook , Xin Li , "Ahmed S. Darwish" , References: <20260325230151.1898287-1-hpa@zytor.com> <20260325230151.1898287-2-hpa@zytor.com> From: Sohil Mehta In-Reply-To: <20260325230151.1898287-2-hpa@zytor.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BYAPR04CA0016.namprd04.prod.outlook.com (2603:10b6:a03:40::29) To DS0PR11MB7997.namprd11.prod.outlook.com (2603:10b6:8:125::14) 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: DS0PR11MB7997:EE_|IA1PR11MB7200:EE_ X-MS-Office365-Filtering-Correlation-Id: d5a10b7f-832f-44fd-0211-08de8adbfcf9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|7416014|376014|366016|18002099003|22082099003|56012099003; X-Microsoft-Antispam-Message-Info: 9xLjigSFnRuO9JOEjHQEmC+A1FbG91+q3nnFIOT6FTKJf4A+7VQ8k87+qMzihzefOyqevKhvryTruQfLkRBk9k2b9njBNvq7r3FWgfSmdEDSWwhedae0FHOEeIUmIyYiPd59gg1uTqWT7tg5DLi/pu6Ozp2ucYylLpRKp6P6DdMaXycQTcxvGJFkWffpPYIcRRk4O3GwEmmvsnuTfEqaVmQjYj9HDBk6uJ4cpQc4jbghUNBrSgkLwsJhVrhOVd5QAo9tgtsgR/GJjeO1TsR33pnKJ2DyekOZ0DU576Suo3C2HukpGgaL20eQ6402n/ZH4u0VhHictJmFDkNCwkV5ulI1AIEDS/ku/JsC8gUgnDpywc9jfA3fT6a377SyUGpJvLa9X0TonwEUa/96NuGDoYepIZteISFJ8MyreGbzHc5QK+MIOwlMW9qi1GqQSgEg60az/6umjeNr2oPcc8ahX8hl1T3ZGQeIoc8hsDT8lxIfzirWZ6+MCJ5qEOwHgw05J12Owv828y0a4FPgjyxxILkupXsE8yd2p6OdZe8d1jTwVSvZhE3TPPrw1sOQmPgpJSdnN4GVbPNHE5kxMVvwYCB8ll081kRkByoeOkb5uBVbday9Rw0qS2t7vdh7cx3v3UEVDZIGSSLy9r1kufL0HOsdtWZEmSwExEGE7TB5lwFV+yZIf8GXlzDiWZ/Pg295wrpNOxL3A2+x9EFYnFBfBKtAx3wbMQz2H9DMSL7QW4E= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:DS0PR11MB7997.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(1800799024)(7416014)(376014)(366016)(18002099003)(22082099003)(56012099003);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?aXBUZU42MlFYRHRKcWFsRWw2S0VqTFBCREtGU1BOQ29KOXg3RmMvMzFUMmtG?= =?utf-8?B?QlpUVnhTbDdNdCswQmpnWHRjdmY4TUhUSk56MjB3bjRlOUpJYnp1Z05Oc0Fx?= =?utf-8?B?bHlxY3pCb2l5amhUL2h6YXFqalZ1ZVNwRVBFbEpmb1BiVzRRZFBvNWJuaDU3?= =?utf-8?B?QnpWQzROYUk2dkJsTURJVjBEL3labWJtaEdhT05zd3JObWhYeWFidDlEcS9L?= =?utf-8?B?N0JuUFg5Wm9NUWVPeWdWbzg4ak8rY2MvSVVJcFZkbndVekg4Y0hpRVR5eTRt?= =?utf-8?B?SzdkNzZmVjRGU0JpODU3TmxDSTdMd3FFTFBJUTA1V3FZVU4wOUZnajF5c0tz?= =?utf-8?B?djdDQmdSMFhtT0ZIMDRtaHh1aTdyS2o3eU02TzZmQ3RHNXVYWHpwVHZlRFMy?= =?utf-8?B?bEVKQkNSbTZZNzRoVEZJL3VaR3BkdHVaQzNxVDZneCs0S0c2Q1g5a3pzTnRr?= =?utf-8?B?NjhWWm9yZjEzbFU5Tk5aREFMZVYzUGgxWXFIN1RwYW5zc2wwVXdnbzhYVE85?= =?utf-8?B?aVFWNzl3STFBVlBRRk5Ja2U1ZUJKaXZDMklNM2ZUdkZMRXpacC9iWHI2RTBJ?= =?utf-8?B?WTlWVHZhYVloS2pDY2tqQkxPVUNWNGhkZmpTTGdpamIxS2lxNThkTDdIbm1h?= =?utf-8?B?eEl0dHZvK2JFSGtmUTJFWURudWNJbnpaYXlZVEVocUVQMWZCWm9GZ3grRDgv?= =?utf-8?B?L29DNG9JL29TRDhEdTZkeHFXeFBjcHdtZDNVRldNYXZUR1JYendlemhwa0Rw?= =?utf-8?B?REVhZVZiOVpHKzhlYjBvZ0pSblV6UVhkVEhCTVl0ekRoTFFGbnN1K3FUMTAw?= =?utf-8?B?YmxTcmhlMGJxSlEwYy9WYWlMUWJJQml1ckxxSjFYeUQxVGsxaXdoM281R1h0?= =?utf-8?B?eVJnV0RFbkFTSGhtY1ZSYldrT3hvUW1RTFQ2TTNxT1pkZ0l1NUUxcFA3Y1JN?= =?utf-8?B?L2N3ZlFQSHJZQ2QybTNQRnZwQkJVKzBkQ29kbXJBOHlES3lzdzJsM0NSNkRR?= =?utf-8?B?bmxOTzZBVXIwb0dxMTAzRHZUSlEvaEM5a1B3SXlRYUkwQVp1VlJ2NkNvWkxD?= =?utf-8?B?QWVKSUhuUWRVRnAybHdCSGM1YS9qWUNVaHk0cTRDN3Z0cUgreXpPVzhqNlFS?= =?utf-8?B?N2ZKZTJGSFdra3dnTHVYeitYYWduKyt5NUp6cFdnL0dLZGlpK1FIUUpRSmZN?= =?utf-8?B?YkxCTFZZQ2JsY2FodHZNWjRBejAxQU5yTk5TcVhYRngwVzBHZUNjSzJWTDlt?= =?utf-8?B?d2RwMHdndVhIREFpR2RLM2pJMUh4SVFYMG1wOUtQbS9wZGVBaGhPdkd4cldw?= =?utf-8?B?T3VoOGxubDdPSi9YanFwbDFKcVFPbUdTVFVYamRKVWxFeU1XRVZsZ2htclBZ?= =?utf-8?B?K0UyeEduT2ZkbVBsT0xZRW9odTRIakdGRENMZHlUeG8yK1RiV2dHNmdjTTFQ?= =?utf-8?B?ZFZnZzQrSmIramhrZWh3eTBWbnZaVGZvU3dpbWRrV2N3RUlDOG5UZlZlaWhr?= =?utf-8?B?WXdwcEtwOCsvVlMxOTNyZlg1dVdsdzA4cmZOd3krN050T1BiUEp3VlZsN3ov?= =?utf-8?B?Rkc5NHc0K0Zhc3gwcTNCczV0RzQralF2L1l6RWdWcklYZWUrQUVYSFFhdjdL?= =?utf-8?B?dGxYSEZHZW5SNlZVRU5CZjRuMnhDcEZPeDVmTG03U05BK2ZvaXhBckk0SG9y?= =?utf-8?B?dFJVekFtZHlvWjQ0Z2tRazFxc3VjNU5qOHFIOE43K2JCcklmOEx6OVlaZ0xp?= =?utf-8?B?bHNoL0xPdXdCaFNPU3J6QzQ0L0dHYlA2M1hrYkJ0TkF6WER1RVBPV3J1eE52?= =?utf-8?B?aGdXcDdqaTRDTEJScXZrM0xZNllidytsT1gwWUZGRjI2eXR0aUNWc2hQbitr?= =?utf-8?B?eU5kNUYxclVyanR2TktOSjVEWlFrUE1UQ1hLTGYyekVvYTlybWl5bFhmdUxC?= =?utf-8?B?bzVYamJNOXdmRTJLUmJFTE5hNmdaemRKckUxYWhJZlE2K1ZpWnhIcXVqYnFn?= =?utf-8?B?Qy9EUUprRkR6SGIzcGRaRFNkTVBHTzdNTktjQllUQk5wcDNEWHNwclpYTkg0?= =?utf-8?B?elZvZzRtQXhYQ2lsOWNCbU9obnNPTEp1cU91OHdzb2NDOS9MUWtmTjRrRWVy?= =?utf-8?B?dzVnSXZpQktzVFBZSjhJdUJCVjBGbitsNnJnMlRYVHM5ZGdxYXN2K2VVY2Jy?= =?utf-8?B?cmoxdFgrdHpIRVVtejFLekRkTDVjN1doRGVPUEhtc1RXYlVmWUlWOCtrUTZw?= =?utf-8?B?bFMxVGRwWndjWWk4Z1FyeDFGeUU2N0ZQbjZkZndJT000bEtTWjN6Ylk4VDZi?= =?utf-8?B?dlkrU3RWcTRoeWE1ZEQzVnhzYlRKTEhmLzNsZFRjY1pQU0VJU0pUZz09?= X-Exchange-RoutingPolicyChecked: N04eLJVJZM9y3+gksqq+m/5cEKloRpyVz+zsfxum8CoU4zvqm3Vzs7S2gzRzKuJnunvNugZu3/q6aro4r1/qEL5/ziga23VyOADvZxLT6N3tImBQn4jUgQr+P+nOt5gZ1x4Czpk2ZeLB9KUtOSWJpJJPUY7dSBqO7Vqc0uqyLuJePwZIZmCRdCAAj08Jy7C6Z9scD5qKmMR43HuUxWOUZroFj7r12leq6HTmniJUMVcxicxa59DJ0/ZQ5Z82wxoXx0nGmOiuT6Z8pcdxJhlRSxyQwwhGERKR39paKB2iIb+AGKvCKIt3GDNHsIE+aJSiUr9sxZ/f1+rtf6TGUJd5vw== X-MS-Exchange-CrossTenant-Network-Message-Id: d5a10b7f-832f-44fd-0211-08de8adbfcf9 X-MS-Exchange-CrossTenant-AuthSource: DS0PR11MB7997.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 Mar 2026 02:04:18.2449 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: U4aJX3IrSstNFekne3NgKc4n11chlA7mzSBZKzD6enx3hSsrj48rcjXw9kBzThWBQ7UNplnvvQ12IOtrMbnakQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR11MB7200 X-OriginatorOrg: intel.com On 3/25/2026 4:01 PM, H. Peter Anvin wrote: > Accordingly, enable FRED by default if the CPU supports it. FRED can > of course still be disabled via the fred=off command line option. > > Signed-off-by: H. Peter Anvin (Intel) > --- Reviewed-by: Sohil Mehta