Subject	x86: Try to wrangle PV clocks vs. TSC
Author	seanjc@google.com
Date	2026-05-29 14:43:48 +0000 UTC
Version	Version 3 Version 4 Version 5
Cc	ajay.kaher@broadcom.com alexey.makhalov@broadcom.com bcm-kernel-feedback-list@broadcom.com boris.ostrovsky@oracle.com bp@alien8.de daniel.lezcano@kernel.org dave.hansen@linux.intel.com decui@microsoft.com dwmw2@infradead.org dwmw@amazon.co.uk haiyangz@microsoft.com hpa@zytor.com jan.kiszka@siemens.com jgross@suse.com jstultz@google.com kas@kernel.org kvm@vger.kernel.org kys@microsoft.com linux-coco@lists.linux.dev linux-hyperv@vger.kernel.org linux-kernel@vger.kernel.org longli@microsoft.com luto@kernel.org mhklinux@outlook.com mingo@redhat.com nikunj@amd.com pbonzini@redhat.com peterz@infradead.org rick.p.edgecombe@intel.com sboyd@kernel.org seanjc@google.com tglx@kernel.org tglx@linutronix.de thomas.lendacky@amd.com virtualization@lists.linux.dev vkuznets@redhat.com wei.liu@kernel.org x86@kernel.org xen-devel@lists.xenproject.org

Patches (47)

Name	Content [All]
[PATCH v4 01/47] x86/tsc: Never re-calibrate TSC frequency if its exact timing is known	[Body]
[PATCH v4 02/47] x86/tsc: Add a standalone helpers for getting TSC info from CPUID.0x15	[Body]
[PATCH v4 03/47] x86/sev: Mark TSC as reliable when configuring Secure TSC	[Body]
[PATCH v4 04/47] x86/sev: Don't override CPU frequency calibration for SNP's Secure TSC	[Body]
[PATCH v4 05/47] x86/sev: Move check for SNP Secure TSC support to tsc_early_init()	[Body]
[PATCH v4 06/47] x86/sev: Shove SNP's secure/trusted TSC frequency directly into "calibration"	[Body]
[PATCH v4 07/47] x86/tdx: Force TSC frequency with CPUID-based info provided by the TDX-Module	[Body]
[PATCH v4 08/47] x86/tsc: Add dedicated hypervisor hooks for getting known TSC/CPU frequencies	[Body]
[PATCH v4 09/47] x86/acrn: Mark TSC frequency as known when using ACRN for calibration	[Body]
[PATCH v4 10/47] x86/tsc: Consolidate forcing of X86_FEATURE_TSC_KNOWN_FREQ for PV code	[Body]
[PATCH v4 11/47] x86/tsc: Kill off x86_platform_ops.calibrate_{cpu,tsc}() hooks	[Body]
[PATCH v4 12/47] x86/tsc: Rename pit_hpet_ptimer_calibrate_cpu() => native_calibrate_cpu_late()	[Body]
[PATCH v4 13/47] x86/tsc: Fold native_calibrate_cpu() into recalibrate_cpu_khz()	[Body]
[PATCH v4 14/47] x86/kvmclock: Rename kvm_get_tsc_khz() to kvmclock_get_tsc_khz()	[Body]
[PATCH v4 15/47] KVM: x86: Officially define CPUID 0x40000010 as PV Timing Info (TSC and Bus)	[Body]
[PATCH v4 16/47] x86/kvm: Obtain TSC frequency from PV CPUID if present	[Body]
[PATCH v4 17/47] x86/kvm: Mark TSC as reliable when it's constant and nonstop	[Body]
[PATCH v4 18/47] x86/kvm: Get local APIC bus frequency from PV CPUID Timing Info	[Body]
[PATCH v4 19/47] x86/tsc: Add standalone helper for getting CPU frequency from CPUID	[Body]
[PATCH v4 20/47] x86/kvm: Get CPU base frequency from CPUID when it's available	[Body]
[PATCH v4 21/47] x86/xen: Obtain TSC frequency from CPUID if present	[Body]
[PATCH v4 22/47] clocksource: hyper-v: Register sched_clock save/restore iff it's necessary	[Body]
[PATCH v4 23/47] clocksource: hyper-v: Drop wrappers to sched_clock save/restore helpers	[Body]
[PATCH v4 24/47] clocksource: hyper-v: Don't save/restore TSC offset when using HV sched_clock	[Body]
[PATCH v4 25/47] x86/kvmclock: Setup kvmclock for secondary CPUs iff CONFIG_SMP=y	[Body]
[PATCH v4 26/47] x86/kvm: Don't disable kvmclock on BSP in syscore_suspend()	[Body]
[PATCH v4 27/47] x86/paravirt: Remove unnecessary PARAVIRT=n stub for paravirt_set_sched_clock()	[Body]
[PATCH v4 28/47] x86/paravirt: Move handling of unstable PV clocks into paravirt_set_sched_clock()	[Body]
[PATCH v4 29/47] x86/kvmclock: Move sched_clock save/restore helpers up in kvmclock.c	[Body]
[PATCH v4 30/47] x86/xen/time: NOP-ify x86_platform's sched_clock save/restore hooks	[Body]
[PATCH v4 31/47] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock	[Body]
[PATCH v4 32/47] x86/tsc: WARN if TSC sched_clock save/restore used with PV sched_clock	[Body]
[PATCH v4 33/47] x86/paravirt: Pass sched_clock save/restore helpers during registration	[Body]
[PATCH v4 34/47] x86/kvmclock: Move kvm_sched_clock_init() down in kvmclock.c	[Body]
[PATCH v4 35/47] x86/xen/time: Mark xen_setup_vsyscall_time_info() as __init	[Body]
[PATCH v4 36/47] x86/pvclock: Mark setup helpers and related various as __init/__ro_after_init	[Body]
[PATCH v4 37/47] x86/pvclock: WARN if pvclock's valid_flags are overwritten	[Body]
[PATCH v4 38/47] x86/kvmclock: Refactor handling of PVCLOCK_TSC_STABLE_BIT during kvmclock_init()	[Body]
[PATCH v4 39/47] timekeeping: Resume clocksources before reading persistent clock	[Body]
[PATCH v4 40/47] x86/kvmclock: Hook clocksource.suspend/resume when kvmclock isn't sched_clock	[Body]
[PATCH v4 41/47] x86/kvmclock: WARN if wall clock is read while kvmclock is suspended	[Body]
[PATCH v4 42/47] x86/paravirt: Mark __paravirt_set_sched_clock() as __init	[Body]
[PATCH v4 43/47] x86/paravirt: Plumb a return code into __paravirt_set_sched_clock()	[Body]
[PATCH v4 44/47] x86/paravirt: Don't use a PV sched_clock in CoCo guests with trusted TSC	[Body]
[PATCH v4 45/47] x86/kvmclock: Use TSC for sched_clock if it's constant and non-stop	[Body]
[PATCH v4 46/47] x86/kvmclock: Plumb in AP-online and BSP-resume to kvmlock, for documentation	[Body]
[PATCH v4 47/47] x86/paravirt: Move using_native_sched_clock() stub into timer.h	[Body]

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