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client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by BN1PEPF0000468B.mail.protection.outlook.com (10.167.243.136) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.8769.18 via Frontend Transport; Fri, 23 May 2025 07:23:29 +0000 Received: from [10.252.206.76] (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 15.1.2507.39; Fri, 23 May 2025 02:23:22 -0500 Message-ID: <2c52daad-0b64-48a9-8e73-d1aba977993b@amd.com> Date: Fri, 23 May 2025 12:53:19 +0530 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 13/13] KVM: selftests: Add a KVM_IRQFD test to verify uniqueness requirements To: Sean Christopherson , "K. Y. Srinivasan" , Haiyang Zhang , Wei Liu , Dexuan Cui , Juergen Gross , Stefano Stabellini , Paolo Bonzini , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Shuah Khan , Marc Zyngier , Oliver Upton CC: , , , , , , , K Prateek Nayak , "David Matlack" References: <20250522235223.3178519-1-seanjc@google.com> <20250522235223.3178519-14-seanjc@google.com> Content-Language: en-US From: Sairaj Kodilkar In-Reply-To: <20250522235223.3178519-14-seanjc@google.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BN1PEPF0000468B:EE_|IA1PR12MB6532:EE_ X-MS-Office365-Filtering-Correlation-Id: 09cdb81f-cf79-4bc0-f097-08dd99cab76c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|82310400026|36860700013|376014|1800799024|7416014|921020; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 May 2025 07:23:29.5870 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 09cdb81f-cf79-4bc0-f097-08dd99cab76c 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: BN1PEPF0000468B.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: IA1PR12MB6532 On 5/23/2025 5:22 AM, Sean Christopherson wrote: > + > +int main(int argc, char *argv[]) > +{ > + pthread_t racing_thread; > + int r, i; > + > + /* Create "full" VMs, as KVM_IRQFD requires an in-kernel IRQ chip. */ > + vm1 = vm_create(1); > + vm2 = vm_create(1); > + > + WRITE_ONCE(__eventfd, kvm_new_eventfd()); > + > + kvm_irqfd(vm1, 10, __eventfd, 0); > + > + r = __kvm_irqfd(vm1, 11, __eventfd, 0); > + TEST_ASSERT(r && errno == EBUSY, > + "Wanted EBUSY, r = %d, errno = %d", r, errno); > + > + r = __kvm_irqfd(vm2, 12, __eventfd, 0); > + TEST_ASSERT(r && errno == EBUSY, > + "Wanted EBUSY, r = %d, errno = %d", r, errno); > + > + kvm_irqfd(vm1, 11, READ_ONCE(__eventfd), KVM_IRQFD_FLAG_DEASSIGN); > + kvm_irqfd(vm1, 12, READ_ONCE(__eventfd), KVM_IRQFD_FLAG_DEASSIGN); > + kvm_irqfd(vm1, 13, READ_ONCE(__eventfd), KVM_IRQFD_FLAG_DEASSIGN); > + kvm_irqfd(vm1, 14, READ_ONCE(__eventfd), KVM_IRQFD_FLAG_DEASSIGN); Hi Sean, I dont see any allocation for the GSI 13 and 14.. Is there any reason for the deassigning these two GSIs ? Regards Sairaj Kodilkar > + kvm_irqfd(vm1, 10, READ_ONCE(__eventfd), KVM_IRQFD_FLAG_DEASSIGN); > + > + close(__eventfd); > + > + pthread_create(&racing_thread, NULL, secondary_irqfd_juggler, vm2); > + > + for (i = 0; i < 10000; i++) { > + WRITE_ONCE(__eventfd, kvm_new_eventfd()); > + > + juggle_eventfd_primary(vm1, __eventfd); > + juggle_eventfd_primary(vm2, __eventfd); > + close(__eventfd); > + } > + > + WRITE_ONCE(done, true); > + pthread_join(racing_thread, NULL); > +}