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>, <jroedel@suse.de>,
<mingo@redhat.com>, <tglx@linutronix.de>,
<dave.hansen@linux.intel.com>, <seanjc@google.com>,
<pbonzini@redhat.com>, <nikunj@amd.com>, <michael.roth@amd.com>,
<ketanch@iitk.ac.in>
Subject: [RFC PATCH 10/11] x86/tsc: Mark Secure TSC as reliable clocksource
Date: Mon, 30 Jan 2023 17:33:26 +0530 [thread overview]
Message-ID: <20230130120327.977460-11-nikunj@amd.com> (raw)
In-Reply-To: <20230130120327.977460-1-nikunj@amd.com>
AMD SNP guests may have Secure TSC feature enabled. Secure TSC as
clocksource is wrongly marked as unstable, mark Secure TSC as
reliable.
Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
---
arch/x86/kernel/tsc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index a78e73da4a74..7a7a5eaacb54 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -1200,7 +1200,7 @@ static void __init check_system_tsc_reliable(void)
tsc_clocksource_reliable = 1;
}
#endif
- if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE))
+ if (boot_cpu_has(X86_FEATURE_TSC_RELIABLE) || cc_platform_has(CC_ATTR_GUEST_SECURE_TSC))
tsc_clocksource_reliable = 1;
/*
--
2.32.0
next prev parent reply other threads:[~2023-01-30 12:06 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-01-30 12:03 [RFC PATCH 00/11] Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 01/11] virt: sev-guest: Use AES GCM crypto library Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 02/11] virt: sev-guest: Move mutex to SNP guest device structure Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 03/11] virt: sev-guest: Add snp_guest_req structure Nikunj A Dadhania
2023-01-30 18:45 ` Dionna Amalie Glaze
2023-01-31 3:08 ` Nikunj A. Dadhania
2023-01-30 12:03 ` [RFC PATCH 04/11] virt: sev-guest: Add simplified helper to assign vmpck Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 05/11] x86/sev: Move and reorganize sev guest request api Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 06/11] x86/mm: Add generic guest initialization hook Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 07/11] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 08/11] x86/sev: Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-01-30 12:03 ` [RFC PATCH 09/11] x86/kvmclock: Use Secure TSC as clock if available Nikunj A Dadhania
2023-01-30 12:03 ` Nikunj A Dadhania [this message]
2023-01-30 12:03 ` [RFC PATCH 11/11] x86/sev: Enable Secure TSC for SNP guests Nikunj A Dadhania
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