Subject	x86: Try to wrangle PV clocks vs. TSC
Author	seanjc@google.com
Date	2026-05-15 19:19:02 +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 daniel.lezcano@kernel.org dave.hansen@linux.intel.com decui@microsoft.com dwmw@amazon.co.uk haiyangz@microsoft.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 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 (41)

Name	Content [All]
[PATCH v3 01/41] x86/tsc: Add a standalone helpers for getting TSC info from CPUID.0x15	[Body]
[PATCH v3 02/41] x86/tsc: Add helper to register CPU and TSC freq calibration routines	[Body]
[PATCH v3 03/41] x86/sev: Mark TSC as reliable when configuring Secure TSC	[Body]
[PATCH v3 04/41] x86/sev: Move check for SNP Secure TSC support to tsc_early_init()	[Body]
[PATCH v3 05/41] x86/tdx: Override PV calibration routines with CPUID-based calibration	[Body]
[PATCH v3 06/41] x86/acrn: Mark TSC frequency as known when using ACRN for calibration	[Body]
[PATCH v3 07/41] clocksource: hyper-v: Register sched_clock save/restore iff it's necessary	[Body]
[PATCH v3 08/41] clocksource: hyper-v: Drop wrappers to sched_clock save/restore helpers	[Body]
[PATCH v3 09/41] clocksource: hyper-v: Don't save/restore TSC offset when using HV sched_clock	[Body]
[PATCH v3 10/41] x86/kvmclock: Setup kvmclock for secondary CPUs iff CONFIG_SMP=y	[Body]
[PATCH v3 11/41] x86/kvm: Don't disable kvmclock on BSP in syscore_suspend()	[Body]
[PATCH v3 12/41] x86/paravirt: Remove unnecessary PARAVIRT=n stub for paravirt_set_sched_clock()	[Body]
[PATCH v3 13/41] x86/paravirt: Move handling of unstable PV clocks into paravirt_set_sched_clock()	[Body]
[PATCH v3 14/41] x86/kvmclock: Move sched_clock save/restore helpers up in kvmclock.c	[Body]
[PATCH v3 15/41] x86/xen/time: Nullify x86_platform's sched_clock save/restore hooks	[Body]
[PATCH v3 16/41] x86/vmware: Nullify save/restore hooks when using VMware's sched_clock	[Body]
[PATCH v3 17/41] x86/tsc: WARN if TSC sched_clock save/restore used with PV sched_clock	[Body]
[PATCH v3 18/41] x86/paravirt: Pass sched_clock save/restore helpers during registration	[Body]
[PATCH v3 19/41] x86/kvmclock: Move kvm_sched_clock_init() down in kvmclock.c	[Body]
[PATCH v3 20/41] x86/xen/time: Mark xen_setup_vsyscall_time_info() as __init	[Body]
[PATCH v3 21/41] x86/pvclock: Mark setup helpers and related various as __init/__ro_after_init	[Body]
[PATCH v3 22/41] x86/pvclock: WARN if pvclock's valid_flags are overwritten	[Body]
[PATCH v3 23/41] x86/kvmclock: Refactor handling of PVCLOCK_TSC_STABLE_BIT during kvmclock_init()	[Body]
[PATCH v3 24/41] timekeeping: Resume clocksources before reading persistent clock	[Body]
[PATCH v3 25/41] x86/kvmclock: Hook clocksource.suspend/resume when kvmclock isn't sched_clock	[Body]
[PATCH v3 26/41] x86/kvmclock: WARN if wall clock is read while kvmclock is suspended	[Body]
[PATCH v3 27/41] x86/kvmclock: Enable kvmclock on APs during onlining if kvmclock isn't sched_clock	[Body]
[PATCH v3 28/41] x86/paravirt: Mark __paravirt_set_sched_clock() as __init	[Body]
[PATCH v3 29/41] x86/paravirt: Plumb a return code into __paravirt_set_sched_clock()	[Body]
[PATCH v3 30/41] x86/paravirt: Don't use a PV sched_clock in CoCo guests with trusted TSC	[Body]
[PATCH v3 31/41] x86/tsc: Pass KNOWN_FREQ and RELIABLE as params to registration	[Body]
[PATCH v3 32/41] x86/tsc: Rejects attempts to override TSC calibration with lesser routine	[Body]
[PATCH v3 33/41] x86/kvmclock: Mark TSC as reliable when it's constant and nonstop	[Body]
[PATCH v3 34/41] KVM: x86: Officially define CPUID 0x40000010 as PV Timing Info (TSC and Bus)	[Body]
[PATCH v3 35/41] x86/kvmclock: Obtain TSC frequency from CPUID if present	[Body]
[PATCH v3 36/41] x86/kvmclock: Get local APIC bus frequency from PV CPUID Timing Info	[Body]
[PATCH v3 37/41] x86/kvmclock: Use TSC for sched_clock if it's constant and non-stop	[Body]
[PATCH v3 38/41] x86/paravirt: kvmclock: Setup kvmclock early iff it's sched_clock	[Body]
[PATCH v3 39/41] x86/paravirt: Move using_native_sched_clock() stub into timer.h	[Body]
[PATCH v3 40/41] x86/tsc: Add standalone helper for getting CPU frequency from CPUID	[Body]
[PATCH v3 41/41] x86/kvmclock: Get CPU base frequency from CPUID when it's available	[Body]

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