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Tue, 11 Apr 2023 07:58:54 -0500 From: Alexey Kardashevskiy To: CC: , , Tom Lendacky , Sean Christopherson , "Pankaj Gupta" , Nikunj A Dadhania , "Santosh Shukla" , Carlos Bilbao , Alexey Kardashevskiy Subject: [PATCH kernel v5 4/6] KVM: SVM/SEV/SEV-ES: Rework intercepts Date: Tue, 11 Apr 2023 22:57:16 +1000 Message-ID: <20230411125718.2297768-5-aik@amd.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: <20230411125718.2297768-1-aik@amd.com> References: <20230411125718.2297768-1-aik@amd.com> MIME-Version: 1.0 X-Originating-IP: [10.180.168.240] 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: CO1NAM11FT089:EE_|LV2PR12MB5965:EE_ X-MS-Office365-Filtering-Correlation-Id: 9b79b31a-e60b-4801-4f01-08db3a8c851b 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:(13230028)(4636009)(39860400002)(396003)(376002)(346002)(136003)(451199021)(40470700004)(36840700001)(46966006)(40460700003)(8936002)(336012)(426003)(6666004)(5660300002)(36860700001)(41300700001)(82310400005)(478600001)(54906003)(36756003)(70206006)(70586007)(8676002)(6916009)(4326008)(83380400001)(316002)(40480700001)(47076005)(186003)(16526019)(2906002)(356005)(81166007)(2616005)(1076003)(26005)(82740400003)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 11 Apr 2023 12:59:00.4642 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b79b31a-e60b-4801-4f01-08db3a8c851b 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: CO1NAM11FT089.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV2PR12MB5965 X-Spam-Status: No, score=0.8 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no 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?1762887245201689822?= X-GMAIL-MSGID: =?utf-8?q?1762887245201689822?= Currently SVM setup is done sequentially in init_vmcb() -> sev_init_vmcb() -> sev_es_init_vmcb() and tries keeping SVM/SEV/SEV-ES bits separated. One of the exceptions is DR intercepts which is for SEV-ES before sev_es_init_vmcb() runs. Move the SEV-ES intercept setup to sev_es_init_vmcb(). From now on set_dr_intercepts()/clr_dr_intercepts() handle SVM/SEV only. No functional change intended. Suggested-by: Sean Christopherson Signed-off-by: Alexey Kardashevskiy Reviewed-by: Santosh Shukla Reviewed-by: Tom Lendacky --- Changes: v5: * updated the comments * removed sev_es_guest() checks from set_dr_intercepts()/clr_dr_intercepts() * removed remaining intercepts from clr_dr_intercepts() --- arch/x86/kvm/svm/sev.c | 11 ++++++ arch/x86/kvm/svm/svm.c | 37 ++++++++------------ 2 files changed, 25 insertions(+), 23 deletions(-) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index b4365622222b..f0885250252d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2946,6 +2946,7 @@ int sev_es_string_io(struct vcpu_svm *svm, int size, unsigned int port, int in) static void sev_es_init_vmcb(struct vcpu_svm *svm) { + struct vmcb *vmcb = svm->vmcb01.ptr; struct kvm_vcpu *vcpu = &svm->vcpu; svm->vmcb->control.nested_ctl |= SVM_NESTED_CTL_SEV_ES_ENABLE; @@ -2974,6 +2975,16 @@ static void sev_es_init_vmcb(struct vcpu_svm *svm) svm_set_intercept(svm, TRAP_CR4_WRITE); svm_set_intercept(svm, TRAP_CR8_WRITE); + /* + * DR7 access must remain intercepted for an SEV-ES guest to disallow + * the guest kernel enable debugging as otherwise a VM writing to DR7 + * from the #DB handler may trigger infinite loop of #DB's. + */ + vmcb->control.intercepts[INTERCEPT_DR] = 0; + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_WRITE); + recalc_intercepts(svm); + /* Can't intercept XSETBV, HV can't modify XCR0 directly */ svm_clr_intercept(svm, INTERCEPT_XSETBV); diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c index 179952a31d3b..0271360e8fde 100644 --- a/arch/x86/kvm/svm/svm.c +++ b/arch/x86/kvm/svm/svm.c @@ -691,23 +691,20 @@ static void set_dr_intercepts(struct vcpu_svm *svm) { struct vmcb *vmcb = svm->vmcb01.ptr; - if (!sev_es_guest(svm->vcpu.kvm)) { - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_WRITE); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_WRITE); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_WRITE); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_WRITE); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_WRITE); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_WRITE); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_WRITE); - } - + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_READ); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR0_WRITE); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR1_WRITE); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR2_WRITE); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR3_WRITE); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR4_WRITE); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR5_WRITE); + vmcb_set_intercept(&vmcb->control, INTERCEPT_DR6_WRITE); vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_READ); vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_WRITE); @@ -720,12 +717,6 @@ static void clr_dr_intercepts(struct vcpu_svm *svm) vmcb->control.intercepts[INTERCEPT_DR] = 0; - /* DR7 access must remain intercepted for an SEV-ES guest */ - if (sev_es_guest(svm->vcpu.kvm)) { - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_READ); - vmcb_set_intercept(&vmcb->control, INTERCEPT_DR7_WRITE); - } - recalc_intercepts(svm); }