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Mon, 27 Feb 2023 02:40:43 -0600 From: Santosh Shukla To: , CC: , , , , , , , Subject: [PATCHv4 01/11] KVM: nSVM: Don't sync vmcb02 V_IRQ back to vmcb12 if KVM (L0) is intercepting VINTR Date: Mon, 27 Feb 2023 14:10:06 +0530 Message-ID: <20230227084016.3368-2-santosh.shukla@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230227084016.3368-1-santosh.shukla@amd.com> References: <20230227084016.3368-1-santosh.shukla@amd.com> MIME-Version: 1.0 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-TrafficTypeDiagnostic: CO1NAM11FT035:EE_|MW4PR12MB7484:EE_ X-MS-Office365-Filtering-Correlation-Id: 22cab38b-e67e-427b-5ace-08db189e531d X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230025)(4636009)(346002)(396003)(136003)(376002)(39860400002)(451199018)(46966006)(40470700004)(36840700001)(83380400001)(966005)(316002)(36756003)(54906003)(110136005)(82310400005)(86362001)(40460700003)(16526019)(44832011)(2906002)(7696005)(36860700001)(8936002)(70586007)(5660300002)(8676002)(70206006)(41300700001)(4326008)(1076003)(6666004)(186003)(2616005)(26005)(47076005)(478600001)(336012)(40480700001)(426003)(81166007)(356005)(82740400003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Feb 2023 08:40:47.9670 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 22cab38b-e67e-427b-5ace-08db189e531d 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: CO1NAM11FT035.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW4PR12MB7484 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,SPF_HELO_PASS, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1758974495528609085?= X-GMAIL-MSGID: =?utf-8?q?1758974495528609085?= From: Santosh Shukla Don't sync vmcb02 V_IRQ back to vmcb12 if KVM (L0) is intercepting virtual interrupts in order to request an interrupt window, as KVM has usurped vmcb02's int_ctl. If an interrupt window opens before the next VM-Exit, svm_clear_vintr() will restore vmcb12's int_ctl. If no window opens, V_IRQ will be correctly preserved in vmcb12's int_ctl (because it was never recognized while L2 was running). Suggested-by: Sean Christopherson Signed-off-by: Santosh Shukla --- v4: https://lore.kernel.org/all/Y9hybI65So5X2LFg@google.com/ suggested by Sean. arch/x86/kvm/svm/nested.c | 21 ++++++++++----------- 1 file changed, 10 insertions(+), 11 deletions(-) diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c index 05d38944a6c0..fbade158d368 100644 --- a/arch/x86/kvm/svm/nested.c +++ b/arch/x86/kvm/svm/nested.c @@ -416,18 +416,17 @@ void nested_sync_control_from_vmcb02(struct vcpu_svm *svm) /* Only a few fields of int_ctl are written by the processor. */ mask = V_IRQ_MASK | V_TPR_MASK; - if (!(svm->nested.ctl.int_ctl & V_INTR_MASKING_MASK) && - svm_is_intercept(svm, INTERCEPT_VINTR)) { - /* - * In order to request an interrupt window, L0 is usurping - * svm->vmcb->control.int_ctl and possibly setting V_IRQ - * even if it was clear in L1's VMCB. Restoring it would be - * wrong. However, in this case V_IRQ will remain true until - * interrupt_window_interception calls svm_clear_vintr and - * restores int_ctl. We can just leave it aside. - */ + /* + * Don't sync vmcb02 V_IRQ back to vmcb12 if KVM (L0) is intercepting + * virtual interrupts in order to request an interrupt window, as KVM + * has usurped vmcb02's int_ctl. If an interrupt window opens before + * the next VM-Exit, svm_clear_vintr() will restore vmcb12's int_ctl. + * If no window opens, V_IRQ will be correctly preserved in vmcb12's + * int_ctl (because it was never recognized while L2 was running). + */ + if (svm_is_intercept(svm, INTERCEPT_VINTR) && + !test_bit(INTERCEPT_VINTR, (unsigned long *)svm->nested.ctl.intercepts)) mask &= ~V_IRQ_MASK; - } if (nested_vgif_enabled(svm)) mask |= V_GIF_MASK;