| Message ID | 20231128125959.1810039-14-nikunj@amd.com |
|---|---|
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From: Nikunj A Dadhania <nikunj@amd.com>
To: <linux-kernel@vger.kernel.org>, <thomas.lendacky@amd.com>,
<x86@kernel.org>, <kvm@vger.kernel.org>
CC: <bp@alien8.de>, <mingo@redhat.com>, <tglx@linutronix.de>,
<dave.hansen@linux.intel.com>, <dionnaglaze@google.com>,
<pgonda@google.com>, <seanjc@google.com>, <pbonzini@redhat.com>,
<nikunj@amd.com>
Subject: [PATCH v6 13/16] x86/kvmclock: Skip kvmclock when Secure TSC is
available
Date: Tue, 28 Nov 2023 18:29:56 +0530
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| Series |
Add Secure TSC support for SNP guests
|
|
Commit Message
Nikunj A. Dadhania
Nov. 28, 2023, 12:59 p.m. UTC
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 <nikunj@amd.com>
---
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..e3de354abf74 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 || cpu_feature_enabled(X86_FEATURE_SNP_SECURE_TSC)) return; if (kvm_para_has_feature(KVM_FEATURE_CLOCKSOURCE2)) {