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 [thread overview]
Message-ID: <20231128125959.1810039-14-nikunj@amd.com> (raw)
In-Reply-To: <20231128125959.1810039-1-nikunj@amd.com>
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)) {
--
2.34.1
next prev parent reply other threads:[~2023-11-28 13:02 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-28 12:59 [PATCH v6 00/16] Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 01/16] virt: sev-guest: Use AES GCM crypto library Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 02/16] virt: sev-guest: Move mutex to SNP guest device structure Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 03/16] virt: sev-guest: Replace dev_dbg with pr_debug Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 04/16] virt: sev-guest: Add SNP guest request structure Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 05/16] virt: sev-guest: Add vmpck_id to snp_guest_dev struct Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 06/16] x86/sev: Cache the secrets page address Nikunj A Dadhania
2023-12-06 22:21 ` Dionna Amalie Glaze
2023-12-07 6:06 ` Nikunj A. Dadhania
2023-11-28 12:59 ` [PATCH v6 07/16] x86/sev: Move and reorganize sev guest request api Nikunj A Dadhania
2023-11-28 22:50 ` kernel test robot
2023-11-29 2:40 ` kernel test robot
2023-12-05 17:13 ` Dionna Amalie Glaze
2023-12-06 4:24 ` Nikunj A. Dadhania
2023-11-28 12:59 ` [PATCH v6 08/16] x86/mm: Add generic guest initialization hook Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 09/16] x86/cpufeatures: Add synthetic Secure TSC bit Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 10/16] x86/sev: Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-11-29 4:08 ` kernel test robot
2023-11-28 12:59 ` [PATCH v6 11/16] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 12/16] x86/sev: Prevent RDTSC/RDTSCP interception " Nikunj A Dadhania
2023-12-05 17:16 ` Dionna Amalie Glaze
2023-12-06 4:37 ` Nikunj A. Dadhania
2023-12-06 18:45 ` Dionna Amalie Glaze
2023-12-07 6:12 ` Nikunj A. Dadhania
2023-11-28 12:59 ` Nikunj A Dadhania [this message]
2023-11-28 12:59 ` [PATCH v6 14/16] x86/sev: Mark Secure TSC as reliable Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 15/16] x86/cpu/amd: Do not print FW_BUG for Secure TSC Nikunj A Dadhania
2023-11-28 12:59 ` [PATCH v6 16/16] x86/sev: Enable Secure TSC for SNP guests Nikunj A Dadhania
2023-12-06 17:46 ` [PATCH v6 00/16] Add Secure TSC support " Peter Gonda
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