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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by CH3PEPF00000016.mail.protection.outlook.com (10.167.244.121) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7519.0 via Frontend Transport; Wed, 1 May 2024 14:55:15 +0000 Received: from chalupa-4a00host.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Wed, 1 May 2024 09:55:14 -0500 From: Manali Shukla To: , CC: , , , , , , , Subject: [PATCH v2 1/5] x86/cpufeatures: Add CPUID feature bit for Idle HLT intercept Date: Wed, 1 May 2024 14:54:29 +0000 Message-ID: <20240501145433.4070-2-manali.shukla@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240501145433.4070-1-manali.shukla@amd.com> References: <20240501145433.4070-1-manali.shukla@amd.com> Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: SATLEXMB03.amd.com (10.181.40.144) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH3PEPF00000016:EE_|SJ0PR12MB7005:EE_ X-MS-Office365-Filtering-Correlation-Id: ac22a883-aedb-479e-f196-08dc69eeb5ee X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230031|82310400014|1800799015|36860700004|376005; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 May 2024 14:55:15.4611 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ac22a883-aedb-479e-f196-08dc69eeb5ee 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=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CH3PEPF00000016.namprd21.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB7005 From: Manali Shukla The Idle HLT Intercept feature allows for the HLT instruction execution by a vCPU to be intercepted by the hypervisor only if there are no pending events (V_INTR and V_NMI) for the vCPU. When the vCPU is expected to service the pending events (V_INTR and V_NMI), the Idle HLT intercept won’t trigger. The feature allows the hypervisor to determine if the vCPU is idle and reduces wasteful VMEXITs. Presence of Idle HLT intercept feature for guests is indicated via CPUID function 0x8000000A_EDX[30]. Signed-off-by: Manali Shukla --- arch/x86/include/asm/cpufeatures.h | 1 + 1 file changed, 1 insertion(+) base-commit: 2489e6c9ebb57d6d0e98936479b5f586201379c7 diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index a38f8f9ba657..a8c5dec042dc 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -381,6 +381,7 @@ #define X86_FEATURE_V_SPEC_CTRL (15*32+20) /* Virtual SPEC_CTRL */ #define X86_FEATURE_VNMI (15*32+25) /* Virtual NMI */ #define X86_FEATURE_SVME_ADDR_CHK (15*32+28) /* "" SVME addr check */ +#define X86_FEATURE_IDLE_HLT (15*32+30) /* "" IDLE HLT intercept */ /* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */ #define X86_FEATURE_AVX512VBMI (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/