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Peter Anvin" , "Peter Zijlstra (Intel)" , "Xin Li (Intel)" , Pawan Gupta , Tom Lendacky , , , Mario Limonciello , "Gautham R. Shenoy" , Babu Moger , Suravee Suthikulpanit , Naveen N Rao , References: <20250825075732.10694-1-kprateek.nayak@amd.com> <20250825075732.10694-2-kprateek.nayak@amd.com> Content-Language: en-US From: K Prateek Nayak In-Reply-To: <20250825075732.10694-2-kprateek.nayak@amd.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN3PEPF0000B36D:EE_|CH3PR12MB9729:EE_ X-MS-Office365-Filtering-Correlation-Id: bd534f0f-afa7-448b-f830-08dde3afed42 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|82310400026|36860700013|1800799024; X-Microsoft-Antispam-Message-Info: =?utf-8?B?eUxaM3FpSnVBYXE2d1dsaEJLRThHTGdqb2VWbGduT3JHQXZlaCtrY2VvMTRX?= =?utf-8?B?OXBDc0pXVTQ5RU9RQTVnelh0MGR0VU4reVVESVMrbWJicU94Y2UySUpPTGIx?= =?utf-8?B?Z3A1Njd1SUxmSFBwcStwSFhrTFlPR3JqdWNoeWR0amVSNHkxYllRRklOS2Vy?= =?utf-8?B?UGRDZnVlQk5td2VOSHZLZ1FBNnlaQjQvT1JKUmFmcWxDUnk3SnRhaUxoQ2N3?= =?utf-8?B?a0F0N1NDdi9MSnZ1K0t5eG9kUmhtSSs1VkgwVC9EUC9Fd1Y0M1VZVVRqb0U0?= =?utf-8?B?RG0zUTh1Q0dpZkwwQ3Q2VDJOQXR5ZkhSenJhNUhjbWl2N05uTGZEVWJlamh5?= =?utf-8?B?QzIvQi9DZzhsN1JqVjMwc2o2OHhHTjFYa1gxaWZ0VnZlaWZsczFQSFpTRi9L?= =?utf-8?B?Rklqc2E0ZUdIZHVMZ0kxekh0bWxOcjhuaG5TbUxJbE8zQVV4WlJ5NUo1S3BI?= =?utf-8?B?SG53aWxPUzZBTWJyV1JodWVoUFlucENvYzlKeC93VWRlTTArcjd4NHZpRURQ?= =?utf-8?B?VTNFNk9IK3pvbGpxSU9jSWNLNUJCOGtvYWx2RUpVOWxkaitjeUJTcW1oaVlR?= =?utf-8?B?UWI4N2R2dEtmcis4U1NLL3I4K2hVMGhNaWRCVmVyeStNT2hEWXFweFNYOTl4?= =?utf-8?B?TnVsZzdQU1k2UlJZT1VJVk14NmxoeUZYWXFyWHJieEh1QkxGNmZDOTJaMWFF?= =?utf-8?B?MGkrY2xJdU4xUGNTRXVKYmZzcms5Z1gzekhNQnVscFQrZmsxZUd2UnJhOFl6?= =?utf-8?B?dStSRmx2Q0ZnbjZ2ODY0SFVBUWlKU3B3MHU2QyticWpkcGlvRy9iT3RzZHBZ?= =?utf-8?B?dklNM3FBZmhsMXNEMWtNc3hqQlBtNGF6cVBVQWVEbitRaDNEV2hTaHhVM2xi?= =?utf-8?B?SUV1czhYd2xqMVR0ZjREUnBJbUYrOFFrUGxOV1M4RDFmWFA1UjdiOHV5d2NW?= =?utf-8?B?MjUxOFJubXVscjIwbS9wcHNhQ2Z2QkFHcWQ4Q3dBTy9ad0RCQUVIT084aFZ1?= =?utf-8?B?S09mQ2V6VGl6clc1TmF4WDczN1hSUTZBdjJaNnB0VmNwamFNbjZSQ2ttSll1?= =?utf-8?B?QlRlamlBbXMrUnBhaGs1dkgxdC92WG1BcHFaUHhwYURIbE51bzlyQWRlYldj?= =?utf-8?B?WGxGc2JXcldkUGVNd1JXVlMvNDI5S2hXRmlTdjhyKzAxK3g5QWgwU25qcmhG?= =?utf-8?B?OVgra0I5VkR0Wm90aEs1ZkF6VVJzWTVyblV3bDljRk5LZU1ucnJrSStKWmlK?= =?utf-8?B?Qzdta3c2cnhUUlYrTHpTb21oUXU2ZXJsTU95WDVjME5xVDNuMld2TnBvejRE?= =?utf-8?B?QTZvSW9mNXM3c1BEdHRkUG5kL0pNRERGMEpaajVVaVRVOS96aUY1d0JmVEdR?= =?utf-8?B?ZGJIWmJpdWIvNFBHSmw1Q2M3TEN5TlJ6MUw3S2p0dHp4d3AybS9qbGpjQmFZ?= =?utf-8?B?Z0tpZStIZnAyUlc2UFVEd2xvSndoeWc1SFZTeXc1QVBzNkxyMmV4OGpubS9N?= =?utf-8?B?MHdoMnVDQnZkSEcxRTJPcS9LZ2dIdWV0MmpBNnlPU21SR0lrS1ZwTCtTZ0VH?= =?utf-8?B?L3UzNGxnVndENENzS3FmaHo1RUl4dlBmOEVqaHlPWHAxK1phYTRpbkRtWWNL?= =?utf-8?B?MHkzZXkzbWNSL1NMM0l5KzhvT21VMzc0bk80VVpvdXkxV0ZydlRPS3hoZFhL?= =?utf-8?B?RXRSRlU2UzRianYvSUU2a1gyeHAyM0pHbnFYY1FRc0l0RTFNSXJyelBIamUx?= =?utf-8?B?SnFvNjlEMk5IcEUyQlFBbEd2cXViak9YT1B3K05sLzVGR1AvN082UmNrVVFS?= =?utf-8?B?QWRBbTVXbGtoN0N3VGh1czdQSWFnTFMyNElUdHc4YjZiVFhpOUJkek5sQTdn?= =?utf-8?B?Q0tMVXZuQjhsbmZrNmIzT0kremtRZXZmZ0pWK1A0MkpjVHZEN0xxYkZ2emtB?= =?utf-8?B?dTZOSzJ1RjJLZ011UVYwRW00RENSVlg1UCtSZ3FkUXJWa09maDdDaStvNU91?= =?utf-8?B?emNIWk1RQkE5MXh0VW43UHV3Y2xtekcvWFd2UG85Y0J4YUo2dXpwRWU5d3BM?= =?utf-8?Q?XnAJRV?= X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB03.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(376014)(7416014)(82310400026)(36860700013)(1800799024);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 Aug 2025 08:18:09.5427 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bd534f0f-afa7-448b-f830-08dde3afed42 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: BN3PEPF0000B36D.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9729 On 8/25/2025 1:27 PM, K Prateek Nayak wrote: > AMD64 Architecture Programmer's Manual Volume 2: System Programming Pub. > 24593 Rev. 3.42 [2] Section 16.12 "x2APIC_ID" mentions the Extended > Enumeration leaf 0x8000001e (which was later superseded by the extended The above should have been CPUID leaf 0xb (Fn0000_000B_EDX[31:0]) and not 0x8000001e. Sorry for the oversight. > leaf 0x80000026) provides the full x2APIC ID under all circumstances > unlike the one reported by CPUID leaf 0x8000001e EAX which depends on > the mode in which APIC is configured. -- Thanks and Regards, Prateek