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Peter Anvin" , "Joerg Roedel (AMD)" , Borislav Petkov , Dave Hansen , Ingo Molnar , Paolo Bonzini , "Robin Murphy" , Sairaj Kodilkar , "Sean Christopherson" , Suravee Suthikulpanit , Thomas Gleixner , "Vasant Hegde" , Will Deacon , , , , Subject: [RFC PATCH v2 3/5] kvm/svm: Introduce per-CPU lock and wakeup queue Date: Wed, 8 Jul 2026 14:44:06 +0530 Message-ID: <20260708091408.12106-4-sarunkod@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260708091408.12106-1-sarunkod@amd.com> References: <20260708091408.12106-1-sarunkod@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-ClientProxiedBy: satlexmb08.amd.com (10.181.42.217) To satlexmb07.amd.com (10.181.42.216) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO1PEPF00012E60:EE_|SJ0PR12MB5663:EE_ X-MS-Office365-Filtering-Correlation-Id: 8723fc3b-8110-4b1c-d70d-08dedcd17b56 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|23010399003|7416014|376014|36860700016|82310400026|921020|22082099003|18002099003|11063799006|56012099006; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:satlexmb07.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230040)(1800799024)(23010399003)(7416014)(376014)(36860700016)(82310400026)(921020)(22082099003)(18002099003)(11063799006)(56012099006);DIR:OUT;SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: LZMVDFDJEgjUdLMa7KGrGrPlkPYzLEC9ZmLPl92zuSa1yGPdQAnZvbM/HyqcA5D/NOLSJEac9xu69l2P+bvTSkIP9WRcLKJ2GYztxAiNKubAvbAQJLZ09y4OPDeuJHox+Xj4r/dKvkFyoch+vQcC3sFjTNra4XXg3qloPLxAT+BKMnFbNfq0A1RYp+yIW4muBqgLDHnoqkPha9b3p7H6jegOM3lRGNmw4JWmjSm5BtEAAUNQt9Vh0oYCNWiRUeYIcqVHf59SMIglWIeNy64pVRVP7kowqg2BjMZyMGEfrCn9bXsC6LtdxxpNp75EQ4uQopJ8iLkZVmTjvZQxawr/qA6557p704h6dJQFOvhVnOyK52jM+1ANrUK4vwZmJl63eu7noThs0qMUMfJnDksvjlIwuufkDJ6acVvrcA1fi3L4U+AwSkXuxKlbwyjhzFwI X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Jul 2026 09:15:40.7420 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 8723fc3b-8110-4b1c-d70d-08dedcd17b56 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=[satlexmb07.amd.com] X-MS-Exchange-CrossTenant-AuthSource: CO1PEPF00012E60.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB5663 Add a per-CPU list and raw spinlock that SVM will use to track vCPUs blocked and waiting for a wakeup. The GAPPI interrupt handler will scan the corresponding CPU’s list to decide which vCPU to run. Initialize both in avic_hardware_setup() when AVIC is enabled. Signed-off-by: Sairaj Kodilkar --- arch/x86/kvm/svm/avic.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c index b666efb5d91c..e7a4c0e90e7a 100644 --- a/arch/x86/kvm/svm/avic.c +++ b/arch/x86/kvm/svm/avic.c @@ -63,6 +63,9 @@ ga_tag; \ }) +static DEFINE_PER_CPU(struct list_head, gappi_vcpu_wakeup_list); +static DEFINE_PER_CPU(raw_spinlock_t, gappi_vcpu_wakeup_list_lock); + static_assert(__AVIC_GATAG(AVIC_VM_ID_MASK, AVIC_VCPU_IDX_MASK) == -1u); #define AVIC_AUTO_MODE -1 @@ -1315,12 +1318,18 @@ static bool __init avic_want_avic_enabled(void) */ bool __init avic_hardware_setup(void) { + int cpu; avic = avic_want_avic_enabled(); if (!avic) return false; pr_info("AVIC enabled\n"); + for_each_possible_cpu(cpu) { + INIT_LIST_HEAD(&per_cpu(gappi_vcpu_wakeup_list, cpu)); + raw_spin_lock_init(&per_cpu(gappi_vcpu_wakeup_list_lock, cpu)); + } + /* AVIC is a prerequisite for x2AVIC. */ x2avic_enabled = boot_cpu_has(X86_FEATURE_X2AVIC); if (x2avic_enabled) { -- 2.34.1