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Mon, 30 Oct 2023 01:38:40 -0500 From: Nikunj A Dadhania To: , , , CC: , , , , , , , , Subject: [PATCH v5 12/14] x86/kvmclock: Skip kvmclock when Secure TSC is available Date: Mon, 30 Oct 2023 12:06:50 +0530 Message-ID: <20231030063652.68675-13-nikunj@amd.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231030063652.68675-1-nikunj@amd.com> References: <20231030063652.68675-1-nikunj@amd.com> MIME-Version: 1.0 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: BL6PEPF0001AB71:EE_|DS7PR12MB5863:EE_ X-MS-Office365-Filtering-Correlation-Id: 8ebcc115-74af-441a-1546-08dbd912ddce 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:(13230031)(4636009)(376002)(396003)(346002)(136003)(39860400002)(230922051799003)(64100799003)(1800799009)(82310400011)(186009)(451199024)(40470700004)(36840700001)(46966006)(6666004)(478600001)(7696005)(70206006)(70586007)(110136005)(26005)(16526019)(336012)(426003)(1076003)(2616005)(41300700001)(2906002)(316002)(4744005)(8676002)(4326008)(8936002)(54906003)(5660300002)(7416002)(36756003)(36860700001)(83380400001)(47076005)(81166007)(356005)(82740400003)(40460700003)(40480700001)(36900700001);DIR:OUT;SFP:1101; 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Sun, 29 Oct 2023 23:39:37 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1781161502221642963 X-GMAIL-MSGID: 1781161502221642963 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 fb8f52149be9..779e7311fa6f 100644 --- a/arch/x86/kernel/kvmclock.c +++ b/arch/x86/kernel/kvmclock.c @@ -288,7 +288,7 @@ void __init kvmclock_init(void) { u8 flags; - if (!kvm_para_available() || !kvmclock) + if (!kvm_para_available() || !kvmclock || cc_platform_has(CC_ATTR_GUEST_SECURE_TSC)) return; if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {