| Message ID | 20230722111909.15166-13-nikunj@amd.com |
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From: Nikunj A Dadhania <nikunj@amd.com>
To: <linux-kernel@vger.kernel.org>, <x86@kernel.org>
CC: <bp@alien8.de>, <thomas.lendacky@amd.com>,
<dionnaglaze@google.com>, <pgonda@google.com>, <seanjc@google.com>,
<pbonzini@redhat.com>, <nikunj@amd.com>
Subject: [PATCH v3 12/14] x86/kvmclock: Skip kvmclock when Secure TSC is
available
Date: Sat, 22 Jul 2023 16:49:07 +0530
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| Series |
Add Secure TSC support for SNP guests
|
|
Commit Message
Nikunj A. Dadhania
July 22, 2023, 11:19 a.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 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; - 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)) {