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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 BN8NAM11FT012.mail.protection.outlook.com (10.13.177.55) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.5314.12 via Frontend Transport; Thu, 2 Jun 2022 14:26:36 +0000 Received: from BLR-5CG113396M.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 15.1.2375.28; Thu, 2 Jun 2022 09:26:33 -0500 From: Santosh Shukla To: Paolo Bonzini CC: Sean Christopherson , Vitaly Kuznetsov , Jim Mattson , Joerg Roedel , Tom Lendacky , , , Subject: [PATCH 0/7] Virtual NMI feature Date: Thu, 2 Jun 2022 19:56:13 +0530 Message-ID: <20220602142620.3196-1-santosh.shukla@amd.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.180.168.240] 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-Office365-Filtering-Correlation-Id: dc8ca169-d4c9-4535-a1de-08da44a3e6d9 X-MS-TrafficTypeDiagnostic: DM6PR12MB3644:EE_ X-Microsoft-Antispam-PRVS: X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Jun 2022 14:26:36.9101 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: dc8ca169-d4c9-4535-a1de-08da44a3e6d9 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: BN8NAM11FT012.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR12MB3644 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently, NMI is delivered to the guest using the Event Injection mechanism [1]. The Event Injection mechanism does not block the delivery of subsequent NMIs. So the Hypervisor needs to track the NMI delivery and its completion(by intercepting IRET) before sending a new NMI. Virtual NMI (VNMI) allows the hypervisor to inject the NMI into the guest w/o using Event Injection mechanism meaning not required to track the guest NMI and intercepting the IRET. To achieve that, VNMI feature provides virtualized NMI and NMI_MASK capability bits in VMCB intr_control - V_NMI(11) - Indicates whether a virtual NMI is pending in the guest. V_NMI_MASK(12) - Indicates whether virtual NMI is masked in the guest. V_NMI_ENABLE(26) - Enables the NMI virtualization feature for the guest. When Hypervisor wants to inject NMI, it will set V_NMI bit, Processor will clear the V_NMI bit and Set the V_NMI_MASK which means the Guest is handling NMI, After the guest handled the NMI, The processor will clear the V_NMI_MASK on the successful completion of IRET instruction Or if VMEXIT occurs while delivering the virtual NMI. To enable the VNMI capability, Hypervisor need to program V_NMI_ENABLE bit 1. The presence of this feature is indicated via the CPUID function 0x8000000A_EDX[25]. Testing - * Used qemu's `inject_nmi` for testing. * tested with and w/o AVIC case. * tested with kvm-unit-test Thanks, Santosh [1] https://www.amd.com/system/files/TechDocs/40332.pdf - APM Vol2, ch-15.20 - "Event Injection". Santosh Shukla (7): x86/cpu: Add CPUID feature bit for VNMI KVM: SVM: Add VNMI bit definition KVM: SVM: Add VNMI support in get/set_nmi_mask KVM: SVM: Report NMI not allowed when Guest busy handling VNMI KVM: SVM: Add VNMI support in inject_nmi KVM: nSVM: implement nested VNMI KVM: SVM: Enable VNMI feature arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/svm.h | 7 +++++ arch/x86/kvm/svm/nested.c | 8 +++++ arch/x86/kvm/svm/svm.c | 47 ++++++++++++++++++++++++++++-- arch/x86/kvm/svm/svm.h | 1 + 5 files changed, 62 insertions(+), 2 deletions(-) -- 2.25.1