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Thu, 19 Dec 2019 15:23:59 +0000 From: John Allen To: kvm@vger.kernel.org Cc: linux-kernel@vger.kernel.org, pbonzini@redhat.com, rkrcmar@redhat.com, John Allen Subject: [PATCH] kvm/svm: PKU not currently supported Date: Thu, 19 Dec 2019 09:23:32 -0600 Message-Id: <20191219152332.28857-1-john.allen@amd.com> X-Mailer: git-send-email 2.24.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: DM3PR12CA0067.namprd12.prod.outlook.com (2603:10b6:0:57::11) To DM5PR12MB2423.namprd12.prod.outlook.com (2603:10b6:4:b3::30) MIME-Version: 1.0 X-Mailer: git-send-email 2.24.0 X-Originating-IP: [165.204.77.1] X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-HT: Tenant X-MS-Office365-Filtering-Correlation-Id: c1383e8f-10a8-4740-38ff-08d7849778ab X-MS-TrafficTypeDiagnostic: DM5PR12MB1708:|DM5PR12MB1708: X-MS-Exchange-Transport-Forked: True X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:6790; X-Forefront-PRVS: 0256C18696 X-Forefront-Antispam-Report: SFV:NSPM;SFS:(10009020)(4636009)(366004)(136003)(39860400002)(346002)(376002)(396003)(189003)(199004)(6486002)(66946007)(66556008)(316002)(4744005)(44832011)(6666004)(6916009)(6506007)(6512007)(2906002)(4326008)(36756003)(66476007)(186003)(5660300002)(8936002)(26005)(478600001)(86362001)(81166006)(81156014)(52116002)(1076003)(2616005)(8676002);DIR:OUT;SFP:1101;SCL:1;SRVR:DM5PR12MB1708;H:DM5PR12MB2423.namprd12.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;MX:1;A:1; Received-SPF: None (protection.outlook.com: amd.com does not designate permitted sender hosts) X-MS-Exchange-SenderADCheck: 1 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 8LKmk6L+W3OPdVTRQ1OB4HdUY865BTrZwSBO9nWQG72ABCKfo+DEC58o/vLuJPpp7CC+ZFioKd3NUGeUduia83yTr7eRpQ5QbBomfayn/gDRbYHNqKcJ+FjEHdrhOZiz4UWywP0Z0P2Dih7453t3O1E57p2uxxI876JypHKZZvUiD0yhPq3V/FYBvPH/9dd8iUicykHGCl4sCMMEePW0npcy32Hj+sbiWBEqTu+m0tDpH/RSNpMRDp/9z1EYmHqNr7Eqb9gjD66R3RFBB7ekYtY0VMq3D5EmY5QcP0qcmSWpetTVWxc2bT3rqlpLuuDZDY0oTK9/omb2smoWLB97gYn6C5oIyNxFrbNWIICYkkRcL/bcCmt4cWO1DL8DigiFJCMHYl2iPbI5Xpg7p/lThQ2yhfx4olDO79TrUSTTaCRMyAyOnxH8xHvG9M1jkq5s X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-Network-Message-Id: c1383e8f-10a8-4740-38ff-08d7849778ab X-MS-Exchange-CrossTenant-OriginalArrivalTime: 19 Dec 2019 15:23:59.7448 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: izVw4Znde0Ge/4/7HsSpTs4drbqRuvZnM/r+cLoKKkOaXtFb8SqiIz5geeGD3oIxvT6ngDRpRPsFSo7FY5lXkg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB1708 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Current SVM implementation does not have support for handling PKU. Guests running on a host with future AMD cpus that support the feature will read garbage from the PKRU register and will hit segmentation faults on boot as memory is getting marked as protected that should not be. Ensure that cpuid from SVM does not advertise the feature. Signed-off-by: John Allen --- arch/x86/kvm/svm.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index 122d4ce3b1ab..f911aa1b41c8 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -5933,6 +5933,8 @@ static void svm_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry) if (avic) entry->ecx &= ~bit(X86_FEATURE_X2APIC); break; + case 0x7: + entry->ecx &= ~bit(X86_FEATURE_PKU); case 0x80000001: if (nested) entry->ecx |= (1 << 2); /* Set SVM bit */ -- 2.24.0