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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 v5 12/14] x86/kvmclock: Skip kvmclock when Secure TSC is available
Date: Mon, 30 Oct 2023 12:06:50 +0530	[thread overview]
Message-ID: <20231030063652.68675-13-nikunj@amd.com> (raw)
In-Reply-To: <20231030063652.68675-1-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..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)) {
-- 
2.34.1


  parent reply	other threads:[~2023-10-30  6:39 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-30  6:36 [PATCH v5 00/14] Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-10-30  6:36 ` [PATCH v5 01/14] virt: sev-guest: Use AES GCM crypto library Nikunj A Dadhania
2023-10-30 17:51   ` Tom Lendacky
2023-11-02  3:33     ` Nikunj A. Dadhania
2023-10-30  6:36 ` [PATCH v5 02/14] virt: sev-guest: Move mutex to SNP guest device structure Nikunj A Dadhania
2023-10-30  6:36 ` [PATCH v5 03/14] virt: sev-guest: Replace dev_dbg with pr_debug Nikunj A Dadhania
2023-10-30  6:36 ` [PATCH v5 04/14] virt: sev-guest: Add SNP guest request structure Nikunj A Dadhania
2023-10-30 18:16   ` Tom Lendacky
2023-11-02  4:01     ` Nikunj A. Dadhania
2023-10-30  6:36 ` [PATCH v5 05/14] virt: sev-guest: Add vmpck_id to snp_guest_dev struct Nikunj A Dadhania
2023-10-30 16:16   ` Dionna Amalie Glaze
2023-10-30 17:12     ` Tom Lendacky
2023-11-02  4:03       ` Nikunj A. Dadhania
2023-10-30 18:26   ` Tom Lendacky
2023-10-30  6:36 ` [PATCH v5 06/14] x86/sev: Cache the secrets page address Nikunj A Dadhania
2023-10-30  6:36 ` [PATCH v5 07/14] x86/sev: Move and reorganize sev guest request api Nikunj A Dadhania
2023-10-30 19:16   ` Tom Lendacky
2023-11-02  4:28     ` Nikunj A. Dadhania
2023-11-02 14:17       ` Tom Lendacky
2023-10-30  6:36 ` [PATCH v5 08/14] x86/mm: Add generic guest initialization hook Nikunj A Dadhania
2023-10-30 17:23   ` Dave Hansen
2023-11-02  4:30     ` Nikunj A. Dadhania
2023-10-30 19:19   ` Tom Lendacky
2023-11-02  5:08     ` Nikunj A. Dadhania
2023-10-30  6:36 ` [PATCH v5 09/14] x86/sev: Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-10-30 16:46   ` Dionna Amalie Glaze
2023-11-02  5:13     ` Nikunj A. Dadhania
2023-10-30 20:26   ` Tom Lendacky
2023-11-02  5:36     ` Nikunj A. Dadhania
2023-11-02 14:29       ` Tom Lendacky
2023-11-02  5:41     ` Nikunj A. Dadhania
2023-11-02 10:36       ` Kirill A. Shutemov
2023-11-06 10:45         ` Nikunj A. Dadhania
2023-11-06 13:00           ` Kirill A. Shutemov
2023-10-30  6:36 ` [PATCH v5 10/14] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests Nikunj A Dadhania
2023-10-30  6:36 ` [PATCH v5 11/14] x86/sev: Prevent RDTSC/RDTSCP interception " Nikunj A Dadhania
2023-10-30 20:32   ` Tom Lendacky
2023-11-02  5:47     ` Nikunj A. Dadhania
2023-10-30  6:36 ` Nikunj A Dadhania [this message]
2023-10-30 21:00   ` [PATCH v5 12/14] x86/kvmclock: Skip kvmclock when Secure TSC is available Tom Lendacky
2023-11-02  5:39     ` Nikunj A. Dadhania
2023-10-30  6:36 ` [PATCH v5 13/14] x86/tsc: Mark Secure TSC as reliable clocksource Nikunj A Dadhania
2023-10-30 17:18   ` Dave Hansen
2023-11-02  5:53     ` Nikunj A. Dadhania
2023-11-02 10:33       ` Kirill A. Shutemov
2023-11-02 12:07         ` Nikunj A. Dadhania
2023-11-02 12:16           ` Nikunj A. Dadhania
2023-11-02 12:38             ` Kirill A. Shutemov
2023-11-06 11:53               ` Nikunj A. Dadhania
2023-11-06 13:03                 ` Kirill A. Shutemov
2023-10-30  6:36 ` [PATCH v5 14/14] x86/sev: Enable Secure TSC for SNP guests Nikunj A Dadhania

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