From: Nikunj A Dadhania <nikunj@amd.com>
To: <linux-kernel@vger.kernel.org>, <thomas.lendacky@amd.com>,
<bp@alien8.de>, <x86@kernel.org>, <kvm@vger.kernel.org>
Cc: <mingo@redhat.com>, <tglx@linutronix.de>,
<dave.hansen@linux.intel.com>, <pgonda@google.com>,
<seanjc@google.com>, <pbonzini@redhat.com>, <nikunj@amd.com>
Subject: [PATCH v9 21/24] x86/kvmclock: Skip kvmclock when Secure TSC is available
Date: Fri, 31 May 2024 10:00:35 +0530 [thread overview]
Message-ID: <20240531043038.3370793-22-nikunj@amd.com> (raw)
In-Reply-To: <20240531043038.3370793-1-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>
Tested-by: Peter Gonda <pgonda@google.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 5b2c15214a6b..3d03b4c937b9 100644
--- a/arch/x86/kernel/kvmclock.c
+++ b/arch/x86/kernel/kvmclock.c
@@ -289,7 +289,7 @@ 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)) {
--
2.34.1
next prev parent reply other threads:[~2024-05-31 4:34 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-31 4:30 [PATCH v9 00/24] Add Secure TSC support for SNP guests Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 01/24] virt: sev-guest: Use AES GCM crypto library Nikunj A Dadhania
2024-06-12 17:17 ` Borislav Petkov
2024-06-13 3:40 ` Nikunj A. Dadhania
2024-05-31 4:30 ` [PATCH v9 02/24] virt: sev-guest: Replace dev_dbg with pr_debug Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 03/24] virt: sev-guest: Make payload a variable length array Nikunj A Dadhania
2024-06-17 20:51 ` Tom Lendacky
2024-06-21 16:54 ` Borislav Petkov
2024-06-23 16:16 ` Nikunj A. Dadhania
2024-06-24 6:11 ` Borislav Petkov
2024-06-24 10:03 ` Nikunj A. Dadhania
2024-06-24 13:00 ` Tom Lendacky
2024-06-24 13:39 ` Borislav Petkov
2024-06-24 18:12 ` Nikunj A. Dadhania
2024-06-25 12:19 ` Borislav Petkov
2024-05-31 4:30 ` [PATCH v9 04/24] virt: sev-guest: Add SNP guest request structure Nikunj A Dadhania
2024-06-18 21:06 ` Tom Lendacky
2024-05-31 4:30 ` [PATCH v9 05/24] virt: sev-guest: Fix user-visible strings Nikunj A Dadhania
2024-06-18 21:11 ` Tom Lendacky
2024-06-19 5:58 ` Nikunj A. Dadhania
2024-05-31 4:30 ` [PATCH v9 06/24] virt: sev-guest: Simplify VMPCK and sequence number assignments Nikunj A Dadhania
2024-06-18 21:27 ` Tom Lendacky
2024-06-19 6:06 ` Nikunj A. Dadhania
2024-06-19 15:12 ` Tom Lendacky
2024-06-19 15:20 ` Nikunj A. Dadhania
2024-05-31 4:30 ` [PATCH v9 07/24] virt: sev-guest: Store VMPCK index to SNP guest device structure Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 08/24] virt: sev-guest: Take mutex in snp_send_guest_request() Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 09/24] virt: sev-guest: Carve out SNP guest messaging init/exit Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 10/24] x86/sev: Move core SEV guest driver routines to common code Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 11/24] x86/sev: Replace dev_[err,alert] with pr_[err,alert] Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 12/24] x86/sev: Make snp_issue_guest_request() static Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 13/24] x86/sev: Make sev-guest driver functional again Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 14/24] x86/sev: Handle failures from snp_init() Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 15/24] x86/sev: Cache the secrets page address Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 16/24] x86/sev: Drop sev_guest_platform_data structure Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 17/24] x86/cc: Add CC_ATTR_GUEST_SECURE_TSC Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 18/24] x86/sev: Add Secure TSC support for SNP guests Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 19/24] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 20/24] x86/sev: Prevent RDTSC/RDTSCP interception " Nikunj A Dadhania
2024-05-31 4:30 ` Nikunj A Dadhania [this message]
2024-05-31 4:30 ` [PATCH v9 22/24] x86/sev: Mark Secure TSC as reliable Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 23/24] x86/cpu/amd: Do not print FW_BUG for Secure TSC Nikunj A Dadhania
2024-05-31 4:30 ` [PATCH v9 24/24] x86/sev: Enable Secure TSC for SNP guests Nikunj A Dadhania
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