linux-kernel - [PATCH 07/16] x86/acrn: Mark TSC frequency as known when using ACRN for calibration

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Message-ID: <20250201021718.699411-8-seanjc@google.com>
Date: Fri, 31 Jan 2025 18:17:09 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org, 
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Juergen Gross <jgross@...e.com>, 
	"K. Y. Srinivasan" <kys@...rosoft.com>, Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
	Dexuan Cui <decui@...rosoft.com>, Ajay Kaher <ajay.kaher@...adcom.com>, 
	Alexey Makhalov <alexey.amakhalov@...adcom.com>, Jan Kiszka <jan.kiszka@...mens.com>, 
	Paolo Bonzini <pbonzini@...hat.com>, Andy Lutomirski <luto@...nel.org>, 
	Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-coco@...ts.linux.dev, 
	virtualization@...ts.linux.dev, linux-hyperv@...r.kernel.org, 
	jailhouse-dev@...glegroups.com, kvm@...r.kernel.org, 
	xen-devel@...ts.xenproject.org, Sean Christopherson <seanjc@...gle.com>, 
	Nikunj A Dadhania <nikunj@....com>, Tom Lendacky <thomas.lendacky@....com>
Subject: [PATCH 07/16] x86/acrn: Mark TSC frequency as known when using ACRN
 for calibration

Mark the TSC frequency as known when using ACRN's PV CPUID information.
Per commit 81a71f51b89e ("x86/acrn: Set up timekeeping") and common sense,
the TSC freq is explicitly provided by the hypervisor.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kernel/cpu/acrn.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/kernel/cpu/acrn.c b/arch/x86/kernel/cpu/acrn.c
index c1506cb87d8c..2da3de4d470e 100644
--- a/arch/x86/kernel/cpu/acrn.c
+++ b/arch/x86/kernel/cpu/acrn.c
@@ -29,6 +29,7 @@ static void __init acrn_init_platform(void)
 	/* Install system interrupt handler for ACRN hypervisor callback */
 	sysvec_install(HYPERVISOR_CALLBACK_VECTOR, sysvec_acrn_hv_callback);
 
+	setup_force_cpu_cap(X86_FEATURE_TSC_KNOWN_FREQ);
 	tsc_register_calibration_routines(acrn_get_tsc_khz,
 					  acrn_get_tsc_khz);
 }
-- 
2.48.1.362.g079036d154-goog