[PATCH v6 00/51] x86: Try to wrangle PV clocks vs. TSC · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 01/51] x86/apic: Provide helpers to set local APIC timer frequency in hz and khz · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 01/51] x86/apic: Provide helpers to set local APIC timer frequency in hz and khz · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 02/51] x86/apic: Add CONFIG_X86_LOCAL_APIC=n stubs for APIC timer frequency APIs · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 02/51] x86/apic: Add CONFIG_X86_LOCAL_APIC=n stubs for APIC timer frequency APIs · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 03/51] x86/tsc: Ensure that TSC recalibration doesn't run if TSC frequency is known · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 04/51] x86/tsc: Restrict recalibrate_cpu_khz() export to p4-clockmod and powernow-k7 · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 04/51] x86/tsc: Restrict recalibrate_cpu_khz() export to p4-clockmod and powernow-k7 · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 06/51] x86/sev: Don't override CPU frequency calibration for SNP's Secure TSC · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 06/51] x86/sev: Don't override CPU frequency calibration for SNP's Secure TSC · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 05/51] x86/sev: Mark TSC as reliable when configuring Secure TSC · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 07/51] x86/sev: Move check for SNP Secure TSC support to tsc_early_init() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 08/51] x86/sev: Shove SNP's secure/trusted TSC frequency directly into "calibration" · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 08/51] x86/sev: Shove SNP's secure/trusted TSC frequency directly into "calibration" · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 09/51] x86/tsc: Add a standalone helper for getting TSC info from CPUID.0x15 · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 10/51] x86/tdx: Force TSC frequency with CPUID-based info provided by the TDX-Module · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 10/51] x86/tdx: Force TSC frequency with CPUID-based info provided by the TDX-Module · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
Re: [PATCH v6 10/51] x86/tdx: Force TSC frequency with CPUID-based info provided by the TDX-Module · Sean Christopherson <seanjc@google.com> · 2026-08-10
[PATCH v6 11/51] x86/tsc: Add dedicated hypervisor hooks for getting known TSC/CPU frequencies · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 11/51] x86/tsc: Add dedicated hypervisor hooks for getting known TSC/CPU frequencies · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 12/51] x86/acrn: Register TSC/CPU frequency callbacks iff frequency is actually in CPUID · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 12/51] x86/acrn: Register TSC/CPU frequency callbacks iff frequency is actually in CPUID · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 13/51] x86/acrn: Mark TSC frequency as known when using ACRN for calibration · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 13/51] x86/acrn: Mark TSC frequency as known when using ACRN for calibration · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
Re: [PATCH v6 13/51] x86/acrn: Mark TSC frequency as known when using ACRN for calibration · Sean Christopherson <seanjc@google.com> · 2026-08-10
[PATCH v6 14/51] x86/tsc: Consolidate forcing of X86_FEATURE_TSC_KNOWN_FREQ for PV code · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 14/51] x86/tsc: Consolidate forcing of X86_FEATURE_TSC_KNOWN_FREQ for PV code · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 15/51] x86/tsc: Kill off x86_platform_ops.calibrate_{cpu,tsc}() hooks · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 15/51] x86/tsc: Kill off x86_platform_ops.calibrate_{cpu,tsc}() hooks · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 16/51] x86/tsc: Rename pit_hpet_ptimer_calibrate_cpu() => native_calibrate_cpu_late() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 17/51] x86/tsc: Fold native_calibrate_cpu() into recalibrate_cpu_khz() · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 17/51] x86/tsc: Fold native_calibrate_cpu() into recalibrate_cpu_khz() · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 18/51] x86/kvmclock: Rename kvm_get_tsc_khz() to kvmclock_get_tsc_khz() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 19/51] x86/kvmclock: Drop dead check on TSC being unstable during kvmclock_init() · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 19/51] x86/kvmclock: Drop dead check on TSC being unstable during kvmclock_init() · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 20/51] KVM: x86: Officially define CPUID 0x40000010 as PV Timing Info (TSC and Bus) · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present · Maksim Davydov <hidden> · 2026-08-16
Re: [PATCH v6 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present · Sean Christopherson <seanjc@google.com> · 2026-08-17
Re: [PATCH v6 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present · Maksim Davydov <hidden> · 2026-08-17
Re: [PATCH v6 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present · Jim Mattson <hidden> · 2026-08-17
Re: [PATCH v6 21/51] x86/kvm: Obtain TSC frequency from PV CPUID if present · Maksim Davydov <hidden> · 2026-08-18
[PATCH v6 22/51] x86/kvm: Mark TSC as reliable when it's constant and nonstop · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 23/51] x86/tsc: Add standalone helper for getting CPU frequency from CPUID · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 24/51] x86/kvm: Get CPU base frequency from CPUID when it's available · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 24/51] x86/kvm: Get CPU base frequency from CPUID when it's available · David Woodhouse <dwmw2@infradead.org> · 2026-08-08
[PATCH v6 25/51] clocksource: hyper-v: Register sched_clock save/restore iff it's necessary · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 26/51] clocksource: hyper-v: Drop wrappers to sched_clock save/restore helpers · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 27/51] clocksource: hyper-v: Don't save/restore TSC offset when using HV sched_clock · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 28/51] x86/kvmclock: Setup kvmclock for secondary CPUs iff CONFIG_SMP=y · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 29/51] x86/kvm: Don't disable kvmclock on BSP in syscore_suspend() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 30/51] x86/paravirt: Remove unnecessary PARAVIRT=n stub for paravirt_set_sched_clock() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 31/51] x86/paravirt: Move handling of unstable PV clocks into paravirt_set_sched_clock() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 32/51] x86/kvmclock: Move sched_clock save/restore helpers up in kvmclock.c · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 33/51] x86/xen/time: NOP-ify x86_platform's sched_clock save/restore hooks · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 34/51] x86/vmware: NOP-ify save/restore hooks when using VMware's sched_clock · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 35/51] x86/tsc: WARN if TSC sched_clock save/restore used with PV sched_clock · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 36/51] x86/paravirt: Pass sched_clock save/restore helpers during registration · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 37/51] x86/kvmclock: Move kvm_sched_clock_init() down in kvmclock.c · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 38/51] x86/xen/time: Mark xen_setup_vsyscall_time_info() as __init · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 39/51] x86/pvclock: Mark setup helpers and related various as __init/__ro_after_init · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 40/51] x86/pvclock: WARN if pvclock's valid_flags are overwritten · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 41/51] x86/kvmclock: Refactor handling of PVCLOCK_TSC_STABLE_BIT during kvmclock_init() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 42/51] timekeeping: Resume clocksources before reading persistent clock · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 43/51] x86/kvmclock: Hook clocksource.suspend/resume when kvmclock isn't sched_clock · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 44/51] x86/kvmclock: WARN if wall clock is read while kvmclock is suspended · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 45/51] x86/paravirt: Mark __paravirt_set_sched_clock() as __init · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 46/51] x86/paravirt: Plumb a return code into __paravirt_set_sched_clock() · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 47/51] x86/paravirt: Don't use a PV sched_clock in CoCo guests with trusted TSC · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 48/51] x86/kvmclock: Use TSC for sched_clock if it's constant and non-stop · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 49/51] x86/kvmclock: Plumb in AP-online and BSP-resume to kvmlock, for documentation · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 50/51] x86/paravirt: Move using_native_sched_clock() stub into timer.h · Sean Christopherson <seanjc@google.com> · 2026-08-06
[PATCH v6 51/51] x86/kvm: Get local APIC bus frequency from PV CPUID Timing Info · Sean Christopherson <seanjc@google.com> · 2026-08-06
Re: [PATCH v6 00/51] x86: Try to wrangle PV clocks vs. TSC · Sean Christopherson <seanjc@google.com> · 2026-09-10
Re: [PATCH v6 00/51] x86: Try to wrangle PV clocks vs. TSC · David Woodhouse <dwmw2@infradead.org> · 2026-09-10

Re: [PATCH v6 04/51] x86/tsc: Restrict recalibrate_cpu_khz() export to p4-clockmod and powernow-k7

From: David Woodhouse <dwmw2@infradead.org>
Date: 2026-08-08 14:39:39
Also in: kvm, linux-coco, linux-hyperv, lkml, xen-devel

On Thu, 2026-08-06 at 16:35 -0700, Sean Christopherson wrote:

Export recalibrate_cpu_khz() only for its two users, p4-clockmod.ko and
powernow-k7.ko, to help document that recalibration is relevant only to
ancient CPUs.

For all intents and purposes, no functional change intended.

Signed-off-by: Sean Christopherson <seanjc@google.com>

Reviewed-by: David Woodhouse <redacted>

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