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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 DM6NAM11FT098.mail.protection.outlook.com (10.13.173.61) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.6609.28 via Frontend Transport; Sat, 22 Jul 2023 11:20:51 +0000 Received: from gomati.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 15.1.2507.27; Sat, 22 Jul 2023 06:20:47 -0500 From: Nikunj A Dadhania To: , CC: , , , , , , Subject: [PATCH v3 11/14] x86/sev: Prevent RDTSC/RDTSCP interception for Secure TSC enabled guests Date: Sat, 22 Jul 2023 16:49:06 +0530 Message-ID: <20230722111909.15166-12-nikunj@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230722111909.15166-1-nikunj@amd.com> References: <20230722111909.15166-1-nikunj@amd.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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: DM6NAM11FT098:EE_|CY8PR12MB7243:EE_ X-MS-Office365-Filtering-Correlation-Id: 7beb562b-4885-46ed-b9c0-08db8aa5b4df 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: 22 Jul 2023 11:20:51.1073 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 7beb562b-4885-46ed-b9c0-08db8aa5b4df 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: DM6NAM11FT098.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY8PR12MB7243 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" The hypervisor should not be intercepting RDTSC/RDTSCP when Secure TSC is enabled. A #VC exception will be generated if the RDTSC/RDTSCP instructions are being intercepted. If this should occur and Secure TSC is enabled, terminate guest execution. Signed-off-by: Nikunj A Dadhania --- arch/x86/kernel/sev-shared.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/x86/kernel/sev-shared.c b/arch/x86/kernel/sev-shared.c index 3a5b0c9c4fcc..1c22025b298f 100644 --- a/arch/x86/kernel/sev-shared.c +++ b/arch/x86/kernel/sev-shared.c @@ -912,6 +912,13 @@ static enum es_result vc_handle_rdtsc(struct ghcb *ghc= b, bool rdtscp =3D (exit_code =3D=3D SVM_EXIT_RDTSCP); enum es_result ret; =20 + /* + * RDTSC and RDTSCP should not be intercepted when Secure TSC is + * enabled. Terminate the SNP guest when the interception is enabled. + */ + if (sev_status & MSR_AMD64_SNP_SECURE_TSC) + return ES_VMM_ERROR; + ret =3D sev_es_ghcb_hv_call(ghcb, ctxt, exit_code, 0, 0); if (ret !=3D ES_OK) return ret; --=20 2.34.1