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Wed, 24 May 2023 10:54:35 -0500 From: John Allen To: CC: , , , , , , , , John Allen Subject: [RFC PATCH v2 4/6] KVM: SVM: Save shadow stack host state on VMRUN Date: Wed, 24 May 2023 15:53:37 +0000 Message-ID: <20230524155339.415820-5-john.allen@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230524155339.415820-1-john.allen@amd.com> References: <20230524155339.415820-1-john.allen@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: BN8NAM11FT077:EE_|SJ2PR12MB8739:EE_ X-MS-Office365-Filtering-Correlation-Id: 436d93b4-7e98-4f71-fce4-08db5c6f2cc5 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)(136003)(346002)(376002)(39860400002)(396003)(451199021)(46966006)(40470700004)(36840700001)(40460700003)(70586007)(4326008)(70206006)(478600001)(316002)(6916009)(54906003)(36756003)(83380400001)(47076005)(5660300002)(26005)(426003)(2616005)(336012)(16526019)(186003)(36860700001)(1076003)(41300700001)(8676002)(8936002)(44832011)(2906002)(7696005)(82310400005)(40480700001)(86362001)(81166007)(82740400003)(356005)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 May 2023 15:54:36.4886 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 436d93b4-7e98-4f71-fce4-08db5c6f2cc5 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: BN8NAM11FT077.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ2PR12MB8739 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,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, T_SCC_BODY_TEXT_LINE 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?1766792905852552851?= X-GMAIL-MSGID: =?utf-8?q?1766792905852552851?= When running as an SEV-ES guest, the PL0_SSP, PL1_SSP, PL2_SSP, PL3_SSP, and U_CET fields in the VMCB save area are type B, meaning the host state is automatically loaded on a VMEXIT, but is not saved on a VMRUN. The other shadow stack MSRs, S_CET, SSP, and ISST_ADDR are type A, meaning they are loaded on VMEXIT and saved on VMRUN. Manually save the type B host MSR values before VMRUN. Signed-off-by: John Allen --- arch/x86/kvm/svm/sev.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index c25aeb550cd9..03dd68bddd51 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -3028,6 +3028,19 @@ void sev_es_prepare_switch_to_guest(struct sev_es_save_area *hostsa) /* MSR_IA32_XSS is restored on VMEXIT, save the currnet host value */ hostsa->xss = host_xss; + + if (boot_cpu_has(X86_FEATURE_SHSTK)) { + /* + * MSR_IA32_U_CET, MSR_IA32_PL0_SSP, MSR_IA32_PL1_SSP, + * MSR_IA32_PL2_SSP, and MSR_IA32_PL3_SSP are restored on + * VMEXIT, save the current host values. + */ + rdmsrl(MSR_IA32_U_CET, hostsa->u_cet); + rdmsrl(MSR_IA32_PL0_SSP, hostsa->vmpl0_ssp); + rdmsrl(MSR_IA32_PL1_SSP, hostsa->vmpl1_ssp); + rdmsrl(MSR_IA32_PL2_SSP, hostsa->vmpl2_ssp); + rdmsrl(MSR_IA32_PL3_SSP, hostsa->vmpl3_ssp); + } } void sev_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, u8 vector)