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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 11:20:55 +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 06:20:50 -0500 From: Nikunj A Dadhania To: , CC: , , , , , , Subject: [PATCH v3 12/14] x86/kvmclock: Skip kvmclock when Secure TSC is available Date: Sat, 22 Jul 2023 16:49:07 +0530 Message-ID: <20230722111909.15166-13-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_|DM4PR12MB7645:EE_ X-MS-Office365-Filtering-Correlation-Id: 48bec2ad-b712-46fc-c8d6-08db8aa5b784 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 11:20:55.5601 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 48bec2ad-b712-46fc-c8d6-08db8aa5b784 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: DM4PR12MB7645 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" For AMD SNP guests having Secure TSC enabled, skip using the kvmclock. The guest kernel will fallback and use Secure TSC based clocksource. Signed-off-by: Nikunj A Dadhania --- arch/x86/kernel/kvmclock.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kernel/kvmclock.c b/arch/x86/kernel/kvmclock.c index 0f35d44c56fe..1be342064851 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -288,7 +288,7 @@ void __init kvmclock_init(void) { u8 flags; =20 - if (!kvm_para_available() || !kvmclock) + if (!kvm_para_available() || !kvmclock || cc_platform_has(CC_ATTR_GUEST_S= ECURE_TSC)) return; =20 if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) { --=20 2.34.1