Subject	x86: Try to wrangle PV clocks vs. TSC
Author	seanjc@google.com
Date	2026-07-01 19:31:22 +0000 UTC
Version	Version 3 Version 4 Version 5 Version 6
Cc	ajay.kaher@broadcom.com alexey.makhalov@broadcom.com bcm-kernel-feedback-list@broadcom.com boris.ostrovsky@oracle.com bp@alien8.de corbet@lwn.net 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-doc@vger.kernel.org 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 skhan@linuxfoundation.org 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 (51)

Name	Content [All]
[PATCH v5 01/51] x86/apic: Provide helpers to set local APIC timer period in hz and khz	[Body]
[PATCH v5 02/51] x86/apic: Add CONFIG_X86_LOCAL_APIC=n stubs for apic_set_timer_period_{,k}hz()	[Body]
[PATCH v5 03/51] x86/tsc: Ensure that TSC recalibration doesn't run if TSC frequency is known	[Body]
[PATCH v5 04/51] x86/tsc: Restrict recalibrate_cpu_khz() export to p4-clockmod and powernow-k7	[Body]
[PATCH v5 05/51] x86/sev: Mark TSC as reliable when configuring Secure TSC	[Body]
[PATCH v5 06/51] x86/sev: Don't override CPU frequency calibration for SNP's Secure TSC	[Body]
[PATCH v5 07/51] x86/sev: Move check for SNP Secure TSC support to tsc_early_init()	[Body]
[PATCH v5 08/51] x86/sev: Shove SNP's secure/trusted TSC frequency directly into "calibration"	[Body]
[PATCH v5 09/51] x86/tsc: Add a standalone helper for getting TSC info from CPUID.0x15	[Body]
[PATCH v5 10/51] x86/tdx: Force TSC frequency with CPUID-based info provided by the TDX-Module	[Body]
[PATCH v5 11/51] x86/tsc: Add dedicated hypervisor hooks for getting known TSC/CPU frequencies	[Body]
[PATCH v5 12/51] x86/acrn: Register TSC/CPU frequency callbacks iff frequency is actually in CPUID	[Body]
[PATCH v5 13/51] x86/acrn: Mark TSC frequency as known when using ACRN for calibration	[Body]
[PATCH v5 14/51] x86/tsc: Consolidate forcing of X86_FEATURE_TSC_KNOWN_FREQ for PV code	[Body]
[PATCH v5 15/51] x86/tsc: Kill off x86_platform_ops.calibrate_{cpu,tsc}() hooks	[Body]
[PATCH v5 16/51] x86/tsc: Rename pit_hpet_ptimer_calibrate_cpu() => native_calibrate_cpu_late()	[Body]
[PATCH v5 17/51] x86/tsc: Fold native_calibrate_cpu() into recalibrate_cpu_khz()	[Body]
[PATCH v5 18/51] x86/kvmclock: Rename kvm_get_tsc_khz() to kvmclock_get_tsc_khz()	[Body]
[PATCH v5 19/51] x86/kvmclock: Drop dead check on TSC being unstable during kvmclock_init()	[Body]
[PATCH v5 20/51] KVM: x86: Officially define CPUID 0x40000010 as PV Timing Info (TSC and Bus)	[Body]
[PATCH v5 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present	[Body]
[PATCH v5 22/51] x86/kvm: Mark TSC as reliable when it's constant and nonstop	[Body]
[PATCH v5 23/51] x86/tsc: Add standalone helper for getting CPU frequency from CPUID	[Body]
[PATCH v5 24/51] x86/kvm: Get CPU base frequency from CPUID when it's available	[Body]
[PATCH v5 25/51] clocksource: hyper-v: Register sched_clock save/restore iff it's necessary	[Body]
[PATCH v5 26/51] clocksource: hyper-v: Drop wrappers to sched_clock save/restore helpers	[Body]
[PATCH v5 27/51] clocksource: hyper-v: Don't save/restore TSC offset when using HV sched_clock	[Body]
[PATCH v5 28/51] x86/kvmclock: Setup kvmclock for secondary CPUs iff CONFIG_SMP=y	[Body]
[PATCH v5 29/51] x86/kvm: Don't disable kvmclock on BSP in syscore_suspend()	[Body]
[PATCH v5 30/51] x86/paravirt: Remove unnecessary PARAVIRT=n stub for paravirt_set_sched_clock()	[Body]
[PATCH v5 31/51] x86/paravirt: Move handling of unstable PV clocks into paravirt_set_sched_clock()	[Body]
[PATCH v5 32/51] x86/kvmclock: Move sched_clock save/restore helpers up in kvmclock.c	[Body]
[PATCH v5 33/51] x86/xen/time: NOP-ify x86_platform's sched_clock save/restore hooks	[Body]
[PATCH v5 34/51] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock	[Body]
[PATCH v5 35/51] x86/tsc: WARN if TSC sched_clock save/restore used with PV sched_clock	[Body]
[PATCH v5 36/51] x86/paravirt: Pass sched_clock save/restore helpers during registration	[Body]
[PATCH v5 37/51] x86/kvmclock: Move kvm_sched_clock_init() down in kvmclock.c	[Body]
[PATCH v5 38/51] x86/xen/time: Mark xen_setup_vsyscall_time_info() as __init	[Body]
[PATCH v5 39/51] x86/pvclock: Mark setup helpers and related various as __init/__ro_after_init	[Body]
[PATCH v5 40/51] x86/pvclock: WARN if pvclock's valid_flags are overwritten	[Body]
[PATCH v5 41/51] x86/kvmclock: Refactor handling of PVCLOCK_TSC_STABLE_BIT during kvmclock_init()	[Body]
[PATCH v5 42/51] timekeeping: Resume clocksources before reading persistent clock	[Body]
[PATCH v5 43/51] x86/kvmclock: Hook clocksource.suspend/resume when kvmclock isn't sched_clock	[Body]
[PATCH v5 44/51] x86/kvmclock: WARN if wall clock is read while kvmclock is suspended	[Body]
[PATCH v5 45/51] x86/paravirt: Mark __paravirt_set_sched_clock() as __init	[Body]
[PATCH v5 46/51] x86/paravirt: Plumb a return code into __paravirt_set_sched_clock()	[Body]
[PATCH v5 47/51] x86/paravirt: Don't use a PV sched_clock in CoCo guests with trusted TSC	[Body]
[PATCH v5 48/51] x86/kvmclock: Use TSC for sched_clock if it's constant and non-stop	[Body]
[PATCH v5 49/51] x86/kvmclock: Plumb in AP-online and BSP-resume to kvmlock, for documentation	[Body]
[PATCH v5 50/51] x86/paravirt: Move using_native_sched_clock() stub into timer.h	[Body]
[PATCH v5 51/51] x86/kvm: Get local APIC bus frequency from PV CPUID Timing Info	[Body]

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