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 177EA2BD19; Wed, 3 Jul 2024 21:38:03 +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=1720042685; cv=fail; b=IQZgEGCl1dYV0CccMv0NVqLw1Yzpc6N4oWSgvOkalvq8NdtMF9QUWve4zD0jEuz9qWax3VdBHR8vwUMnTL2nHQqwCFpiZAoMpDY9KLN0cC7WWZr6QUZ/LInpcZYp0ntVMdtiSty3NDH713ybcbspH7HMhfKqp4XmCfoo2i1pD+c= ARC-Message-Signature:i=2; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720042685; c=relaxed/simple; bh=ygCFcCgOFxTeCsRHpsoPJJckcu19QoNQfnc+c38IfGY=; h=Message-ID:Date:Subject:From:To:CC:References:In-Reply-To: Content-Type:MIME-Version; b=u0N7GAn5wH/ndhWwVWvB0LA8gkNGtdkW11WPK6Y/1x4Fh5iTe1F1tAuCgG7i9r9s3McuoQbq79kNwYEdkjWpGn5lYyIBc3IxoJlZB2gOdRIn8zO+lvFOz6pS0RDAJiuyI0T+EtpPp9UW7zDBwuEH51/c8cOWVd3DvUvq85U42Wk= 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=cJU7PCgD; 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="cJU7PCgD" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1720042684; x=1751578684; h=message-id:date:subject:from:to:cc:references: in-reply-to:content-transfer-encoding:mime-version; bh=ygCFcCgOFxTeCsRHpsoPJJckcu19QoNQfnc+c38IfGY=; b=cJU7PCgD0RG1W0i05hUB40gh4RWz7jIUB7ZBTLrL8iUnWf6BuRMdXfRH dGG+CAfz9PWr0r2GCyRVhuFOjtpzkuh+kAdYnNExHFVB7nhDkQWn3AZgF uK1lXGT4ZsVDtY5AkYnJDAhhY+8JZV1lxtgz0Vk0WBjvi3gZcVAHNgyKJ 0Jtka9++epDyOdvhsneAJ9wO74gd62Vd0J+H9VreHtlr8lBfgS0O3XTVo JaUSlDbxJLYzLAG96LEBarsPG7ShrxSv3C46j7cli7SnQBQXOlLaixpVI Dt3mCXzE6B3YSIcaH2pEktcuijYANQlVFya9Mhre16QaqpDmJs6FSs1Nq w==; X-CSE-ConnectionGUID: B/xmXGiZTJaJ1G9piYFteQ== X-CSE-MsgGUID: W6W95T12RXSGDvBzIm4ZSg== X-IronPort-AV: E=McAfee;i="6700,10204,11122"; a="20202510" X-IronPort-AV: E=Sophos;i="6.09,183,1716274800"; d="scan'208";a="20202510" Received: from fmviesa005.fm.intel.com ([10.60.135.145]) by fmvoesa107.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Jul 2024 14:38:03 -0700 X-CSE-ConnectionGUID: w/byZf30QQaWuZGdeKyCnA== X-CSE-MsgGUID: C5uFQ54lSxmiMQWfzkVU1Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.09,183,1716274800"; d="scan'208";a="50836347" Received: from fmsmsx601.amr.corp.intel.com ([10.18.126.81]) by fmviesa005.fm.intel.com with ESMTP/TLS/AES256-GCM-SHA384; 03 Jul 2024 14:37:44 -0700 Received: from fmsmsx611.amr.corp.intel.com (10.18.126.91) by fmsmsx601.amr.corp.intel.com (10.18.126.81) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 3 Jul 2024 14:37:44 -0700 Received: from fmsmsx602.amr.corp.intel.com (10.18.126.82) by fmsmsx611.amr.corp.intel.com (10.18.126.91) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39; Wed, 3 Jul 2024 14:37:43 -0700 Received: from FMSEDG603.ED.cps.intel.com (10.1.192.133) by fmsmsx602.amr.corp.intel.com (10.18.126.82) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.39 via Frontend Transport; Wed, 3 Jul 2024 14:37:43 -0700 Received: from NAM11-CO1-obe.outbound.protection.outlook.com (104.47.56.169) by edgegateway.intel.com (192.55.55.68) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.1.2507.39; Wed, 3 Jul 2024 14:37:43 -0700 ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=f+IFoT+yuBgrI/HXoOBdeI6b0QDVY3LphOxL9ZuR1Fjnj5LW1SQxne1cXE/DLSlIMpbLekP2ucc3oY+CjFPiIHcDE3hL5Vm60myd4up/CCcYvQ8kwzHoTTT/efXf8arz1ODTZXGB/mV/+ulZ51hHcwRGkrhvgLCujhOAK28n6t0lmmRP5MHke/9YatAzTdITNEkC1TgnUPVNUY8ZLdlRI2pf+oiTKWmEjKTa9ECc1aCBLOmjn1sto+Wk69Q3VzNSo8f5YWa5VyWxVlXSW3bEE0ZNKqQR/uCNQSyj47583rRm95vkzeom6TcUGoYqSS1tgwzL3tFgYZy6U1I1HA2tdQ== 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=aAcBdTQTieWS14AH77vpV0aGeTu7NvrEKr5+MRy6DaI=; b=QjslywrjTuN0VML81LWUcj75MzcXmYqe7qIpNjCKFIIKxv0K0LO5FO2uMlfwWuS+hSQsrG7GJRSvkfY2ZZrGvgzWUHVulGePh7VBxbJDTF56rCj+nD6FEuAjWaNn1Za+Qs16gkX/grrQHQ3QZWq8qcQjq+aparnxpzC0P/WvocTDBgjqosfxbr37bt9ZqpxiQm6aEGVqY38tftpq9jW5oPDWWjzJGtpeGDEEF7E87VTyNB1LCMQXXKFn279WX6BXdwaqRfxcyXnYVgmxNGtCu6g89fVCGREfjijXEhW287Uyjvt4d98r8kPfL6hpzKZXgelgikPlIfVkx/OPhoRTLA== 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 SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) by IA0PR11MB7934.namprd11.prod.outlook.com (2603:10b6:208:40d::12) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7719.36; Wed, 3 Jul 2024 21:37:40 +0000 Received: from SJ2PR11MB7573.namprd11.prod.outlook.com ([fe80::61a:aa57:1d81:a9cf]) by SJ2PR11MB7573.namprd11.prod.outlook.com ([fe80::61a:aa57:1d81:a9cf%3]) with mapi id 15.20.7719.029; Wed, 3 Jul 2024 21:37:40 +0000 Message-ID: <9b19f440-ee78-4a4f-ab87-e9fff26ea6a4@intel.com> Date: Wed, 3 Jul 2024 14:37:37 -0700 User-Agent: Mozilla Thunderbird Subject: Re: VMX Preemption Timer appears to be buggy on SKX, CLX, and ICX From: Reinette Chatre To: Sean Christopherson CC: , , , , , , , , , , , , , "Hao, Xudong" References: <2fccf35715b5ba8aec5e5708d86ad7015b8d74e6.1718214999.git.reinette.chatre@intel.com> <8a34f1d4-9f43-4fa7-9566-144b5eeda4d9@intel.com> Content-Language: en-US In-Reply-To: <8a34f1d4-9f43-4fa7-9566-144b5eeda4d9@intel.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: MW3PR06CA0027.namprd06.prod.outlook.com (2603:10b6:303:2a::32) To SJ2PR11MB7573.namprd11.prod.outlook.com (2603:10b6:a03:4d2::10) 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: SJ2PR11MB7573:EE_|IA0PR11MB7934:EE_ X-MS-Office365-Filtering-Correlation-Id: 49f5154b-ae15-4dfe-0256-08dc9ba85d5f X-LD-Processed: 46c98d88-e344-4ed4-8496-4ed7712e255d,ExtAddr X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|366016|376014|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?T3E0SHdNaExpOGE0MVRiRFRlOVAwSHJreDZnTlM3QVUvaWh5aXIwSGUrc0pP?= =?utf-8?B?SnFMTFVmZS9pY3hMTDZTRVpiclFVTzU4ei9tblhkd2kvTFVXQlkvS0pzbXcz?= =?utf-8?B?Ym5oSEhmS3VEYy9NTnhiL0o2YTIzY3czSGRheGhBT0ZVaTRFMncvYTh6aGJ0?= =?utf-8?B?c2hwYmQ0VTAwekd3eUJVUlNObi8rOGJyVFB0enVsdUZWSTFqblQycjJtaHJK?= =?utf-8?B?MFBOUWswWFZXOTJSeDl1UjdpaWxzeDhUSGFiWW9seU10djMvT2NDeEpia1Ri?= =?utf-8?B?KzhxSjcrYXY0UitlTm5Kc3dmMmFqODFpQ2NIb21WOWF2dWZBd3VySks1VmxW?= =?utf-8?B?QUpnV0dBNWh4ZkVKRkZpUUdlRU5MbHptNmhTeWdsYXlhV2NTUTJOd3ZnYmlP?= =?utf-8?B?djZ4ZlpXWm9OOVJvS2xBbEJtZGgrNkV4eGw0d0hQOXJYSUtpQlZLTWtmTkc3?= =?utf-8?B?VzRxZ0NWZURzTUFIOW0yZm41bjc0MlJpOHA0ekowVUd2WUJETndOTUZhQklF?= =?utf-8?B?U0NYVUxrdkdQRm1RUkplaS9DcHRSOFBMNlo5MG9WWERmQklCRm5JVmZjaDhE?= =?utf-8?B?UTZkY2ZaUEFrNlRhZys5aEpQUDRVaGgxVnZ3TEVZZHdiUG50Z2FaQzlySzIz?= =?utf-8?B?TWNEWlpwVzUvQUhvK3dTZGo2cERIQ2ZQd1BJemlZeTlleEd4QVByR2RFUm03?= =?utf-8?B?bDVkRVZZN1hpOFU0VWFFK1owak9iSXp0MzBHVm13UzlBT0IrVnUwSDEycUtZ?= =?utf-8?B?UjlQRGo0RCtjVDFkZVk0NkNRb2VON1p5U1h3QWJiakVXc3hVSGoyRlRwdzJF?= =?utf-8?B?TFpoOHNVV0hyMUoydVl5STlPTW5KejZobU5Nak1hSUUrWGkzUmpxMm56T04z?= =?utf-8?B?VldYRVlkamJRUEtldCtEVmE3RWxteUVtWmJmZGI2T3Z3Y1loQlE3N3h3Z2ND?= =?utf-8?B?NTVQcm1OTEZIMTN3ZHhDUWphVnRhdFFXdEg5dDJuSmF1SkdqVFhLeGlIa3ZR?= =?utf-8?B?UC8zeUYzOGtNd2NQSHR0dkxxMksxeDgyRWNNVmxEb0JVUFk0RjRwcWZSeVBC?= =?utf-8?B?WVpEZmppUVUyUE1kcENMYU5WOCtpdVdkU0Z6R3cwSitnT29MdUt1VHIyYlRk?= =?utf-8?B?aTM1UzJRRmpJTFFOL2JtUjVMMnpac01HR2RVT2JPZ0JrVUtjQXVJcm1vZlRj?= =?utf-8?B?VnNsSFk1V3NyRXhRenc4aHZJdWpPOHN2VzRTa2dqMG1oSElOQ2NFRXM4eExi?= =?utf-8?B?dC83RTkzci9CVm85eGo4Z2lFRTlIb0hEK2NqMkdsZzRKQ2ZxVmRsemRmOW5W?= =?utf-8?B?dU5vVFJRT0xhMVg0K2RzOHpCcVVaYy9SODd6SW00dG1raWs2eVpuemgvcG9z?= =?utf-8?B?NXB0bEN5SWJnOUhxM09LMXBMVFQ2azhUd3BmQU80dHA1cG5Yd1FTaXdra2ZN?= =?utf-8?B?SUd3RUZTVDhGS3Y2aXZSUWNHL09KTlZRbkNPNHBqZkhaeW5mQ3ZOWnV1S096?= =?utf-8?B?U0dMN2lqOVNkRXYzcm92T21Jc3JwbDhlZnVLMmdpWmV4bWhLejhaT0VrZHVW?= =?utf-8?B?c2tvVmlOWTFGU3JsV25NTUxCVHdjVEF2T3Z6R3NyQnJPYkw4aElqN1BVMnZ4?= =?utf-8?B?WWIwUEJhS1U2UmROSWpCOGpqNUJ1a2w2S213SHJzK2JsNWVoODV3T2pobnRm?= =?utf-8?B?bGZ6R1dLRFV3UmdZRFVzRlJMaXhOVUl4NGdhZ2lMQkRUMkxoZjM3SkhxRXY2?= =?utf-8?B?MkRkaXp0SlQ0WDZvMTNvQStWNXlja1pBQm55UlJUbmtQZE0rdW95dVdCUCtw?= =?utf-8?Q?ppnIzdoL7dkv1g2M8cTL5XsSL24w7g/ANi7rI=3D?= X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:SJ2PR11MB7573.namprd11.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230040)(366016)(376014)(1800799024);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?utf-8?B?aFBxMGZSMzNxSm4vR3BGTndJUGxKaVBvQ0VIYktHWTdMNFl4Tkk1Wkk1cHRE?= =?utf-8?B?Q05IcmM4b2xKUVJGaGM3emdOS1ZWT2tkV2drcXhSZXU3K2pNM1BrNXpDaEV3?= =?utf-8?B?NHdUT3p1TW1WK2V6VEtsQlF5azBDUVo3SmtHdWlsSXV0dXhEN05BK01NcGJP?= =?utf-8?B?bVBXWk4rRG9wbjJmcUZqTHhjaUxXa2I0L3JoSnQycVNyeXZoaFpRdWNWK2ho?= =?utf-8?B?enZWZE5PRkJoNm4vYUJvUWFjL0pGMyszL1RMVXRrbE9UYmtkcXZ0TmRJcmFs?= =?utf-8?B?Z3VRcmYzZFVlZUJ4SEtsTFJHRy9yK0pFK0QyOXhIU1A5dDJ0eVNQK2RlSW50?= =?utf-8?B?d0NHVkc0S3FoYjUzNnRNbmtISXJBRTRMUW1ubW04NE1mdXpyZzRjdHpTRkN2?= =?utf-8?B?Z0c4WTBzcTF5MHhiOEN2STJuUXJzanM0dzZ2R3RRaHZ5dVJNUTI5cVpDWUFK?= =?utf-8?B?ZTNrWTQ3RVFVWnhGeFZ6a2x5MEFFb3poZEZHZ3pYQWFzMm4vdGk0U1NSVEQy?= =?utf-8?B?WGUyRUpvMnlENVd1SWlSNERxc2Z5djZTTDM5bE0ySDJ5dlQvQ0F2aU9zYVky?= =?utf-8?B?RGtuc3JrWEdqdU5keEJKRjBkWUhjcjY4dWt6ejRNWVdhbjlPTkZXS3JnQTAw?= =?utf-8?B?WFNzT0w1UXBTOWZqakhBcGQrMHJ5OGZwaVBSRE5kampobTMrRkpCcE4rL0RO?= =?utf-8?B?dS9ndGxEUlVvaVZGOHNUZlBnL1pVUXZtbUx6Sk4wZW9tNWptM1pXbitHbnZO?= =?utf-8?B?Yy8wV1l3RVMxQmJwOW42bmt5cm5seXl4YzY0Z2tHQUc4SVZDdUxIY1hKcGtN?= =?utf-8?B?V1BMZ0RKZGJpL0MrdXVqS3JycklxSHlDNnRpZ3c3Y0cwK0pBZGhWemppdW9z?= =?utf-8?B?SEx2YkhMYlRlVUlUYzR1eEtjcmpudFNUc1lpZ2hhZmtYNEpTZ01RSC9ZUlhh?= =?utf-8?B?N2Z2dlBwNTV3Zkg3S3NQcEcybWsyMTRTcmVCeDM1Nlk3TXdZOVB5TWZYUklC?= =?utf-8?B?aUU2R2RPNndhNTB5bU9adFpKLzNUUmh1ZDM1SEVaaG5aNWtRb1o2eWpZQ3Ez?= =?utf-8?B?MXN5K1FFdUFOdHl6a1BIQlo0aEZtZWtNaFV4K3Y5NGJ0REJUNGErcklqWnE1?= =?utf-8?B?ZmlJKzZsWUxqenI0MS94d2RxbmYvZXJFTGs2ZEc3bW00RlhPdFRqdHpFY09W?= =?utf-8?B?WmNnUTdrVm42NzZlR0RQTHFGdlAvTzU2V1JTZzRmTitZUlc1VmFEdG40RXJJ?= =?utf-8?B?a0puQzIzQmVUMktheU1HcXVDbldSbEJaUUNVOFphUUtmbWZZK1hCTGhQSi9o?= =?utf-8?B?VVU5RkpIY1p5d2JzTERxZXdjK0RFaUFoQ3RXWER6ZDV0V3l1NFdrdlM2NXFq?= =?utf-8?B?S1ZHdXpLL3RlM2lWdGRkd0RuYU51SERNV2Y2UzZ3QTF0TkQzN0xaSkZpT3Np?= =?utf-8?B?WklFTlRodWkvQUNQeHloaGNvdFVGRVZhMmRBcGJNblJjR0JreUxIWitiOUJ6?= =?utf-8?B?VEdDS01ERDJVUk9aWGZkNnhwNGZjck9kWlBNRFZKazdqUWxBYWhvakp3a09v?= =?utf-8?B?ZkoreHJpd0JJVDB5TkpQbVU5V3FZRENIc09LNng2VzJnYnFUWnVEdjZRVjNE?= =?utf-8?B?dmhnQkZLU0VxU3htMDBmR1p6bjlycEpibjJCNDJOd1BCUllpMWRzaVFyRGRJ?= =?utf-8?B?TWdyYkEwV0RlOEhPenVMcGh4amR3TDU5WEczYnhsNmdaNGhCQmxhbTFBaDM5?= =?utf-8?B?MGJrOXNPOVc4ek56RFIzcmJXd0tXSnFvZ2pJLzNOcDhTL25WT25SMGM0ZitX?= =?utf-8?B?SGpoa0NHcnVRTjArUzQwWHRWSHgrQjJnenhXcnYvVzZiZFZGbjJ3S3RuVk1s?= =?utf-8?B?YkRnNzF2UjBXbTNaMjY4VHh1cExVWXk4TWU1aWJZVklRdDBpSEFFNCtoNFE3?= =?utf-8?B?OFNWWDBHa0MwOWFKVXRHUGMwV1J2WElCYXZnak1BMndjM3RhaE9ETWFBMjNB?= =?utf-8?B?S3dmbkQ5cTJ3Ym9LQ0FLYWVrd0N5RjYyU1FxT2pnSHZDZkpUVVo2MTlIVUhL?= =?utf-8?B?QWNjYU1UTW1wV0pQSCtZZk9PUDUwUFhtWS8yM3BWbEwxNVNrREwyM01VcFUr?= =?utf-8?B?dkp4bU5nWGs4NzI5VVlHK0h5ZkNPN0JzZHV4MGRicHBDRitESDAwSkJhbTN5?= =?utf-8?B?U1E9PQ==?= X-MS-Exchange-CrossTenant-Network-Message-Id: 49f5154b-ae15-4dfe-0256-08dc9ba85d5f X-MS-Exchange-CrossTenant-AuthSource: SJ2PR11MB7573.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jul 2024 21:37:40.4101 (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: 0d5Y3Y+mu+IUd5L/hp/a0lueZiEO0QWFVWKBHNquI0WYHGr1fIsmHydFRBP9KHv9VVo0AljBFltC7nVnyII1OHYY9yAg0FLTY+iedi65N5Q= X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA0PR11MB7934 X-OriginatorOrg: intel.com (a short update ...) On 7/3/24 1:14 PM, Reinette Chatre wrote: > On 6/28/24 5:39 PM, Sean Christopherson wrote: >> Forking this off to try and avoid confusion... >> >> On Wed, Jun 12, 2024, Reinette Chatre wrote: > > ... > >>> + >>> +        freq = (tmict - tmcct) * tdcrs[i].divide_count * tsc_hz / (tsc1 - tsc0); >>> +        /* Check if measured frequency is within 1% of configured frequency. */ >>> +        GUEST_ASSERT(freq < apic_hz * 101 / 100); >>> +        GUEST_ASSERT(freq > apic_hz * 99 / 100); >>> +    } >> >> This test fails on our SKX, CLX, and ICX systems due to what appears to be a CPU >> bug.  It looks like something APICv related is clobbering internal VMX timer state? >> Or maybe there's a tearing or truncation issue? > > It has been a few days. Just a note to let you know that we are investigating this. > On my side I have not yet been able to reproduce this issue. I tested > kvm-x86-next-2024.06.28 on an ICX and an CLX system by running 100 iterations of > apic_bus_clock_test and they all passed. Since I have lack of experience here there are > some Intel virtualization experts helping out with this investigation and I hope that > they will be some insights from the analysis and testing that you already provided. I have now been able to test on SKX also and I am not yet able to reproduce. For reference, the systems I tested on are: SKX: https://ark.intel.com/content/www/us/en/ark/products/120507/intel-xeon-platinum-8170m-processor-35-75m-cache-2-10-ghz.html ICX: https://ark.intel.com/content/www/us/en/ark/products/212459/intel-xeon-platinum-8360y-processor-54m-cache-2-40-ghz.html CLX: https://ark.intel.com/content/www/us/en/ark/products/192476/intel-xeon-platinum-8260l-processor-35-75m-cache-2-40-ghz.html Reinette