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From: Sean Christopherson <seanjc@google.com>
To: David Woodhouse <dwmw@amazon.co.uk>
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Subject: Re: [PATCH v3 02/41] x86/tsc: Add helper to register CPU and TSC freq calibration routines
Date: Wed, 20 May 2026 10:56:38 -0700	[thread overview]
Message-ID: <ag311hHnqrCGR9Jc@google.com> (raw)
In-Reply-To: <949e39aec749f019b18fa41c2a42bcc9231288b9.camel@amazon.co.uk>

On Mon, May 18, 2026, David Woodhouse wrote:
> On Fri, 2026-05-15 at 12:19 -0700, Sean Christopherson wrote:
> > 
> > --- a/arch/x86/xen/time.c
> > +++ b/arch/x86/xen/time.c
> > @@ -569,7 +569,7 @@ static void __init xen_init_time_common(void)
> >  	static_call_update(pv_steal_clock, xen_steal_clock);
> >  	paravirt_set_sched_clock(xen_sched_clock);
> >  
> > -	x86_platform.calibrate_tsc = xen_tsc_khz;
> > +	tsc_register_calibration_routines(xen_tsc_khz, NULL);
> >  	x86_platform.get_wallclock = xen_get_wallclock;
> >  }
> >  
> 
> xen_tsc_khz() doesn't use CPUID but really *should*.
> 
> Care to pull in
> https://lore.kernel.org/all/20260509224824.3264567-31-dwmw2@infradead.org/
> to your next round please?
> 
> (Without the misplaced changes in kvm/x86.c that should have been in
> two different prior commits, and are now folded into those correctly in
> my kvmclock5 branch ready for the next posting of that).

Ya, will do.  What's one more patch...

  reply	other threads:[~2026-05-20 17:56 UTC|newest]

Thread overview: 101+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-05-15 19:19 [PATCH v3 00/41] x86: Try to wrangle PV clocks vs. TSC Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 01/41] x86/tsc: Add a standalone helpers for getting TSC info from CPUID.0x15 Sean Christopherson
2026-05-20 18:59   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 02/41] x86/tsc: Add helper to register CPU and TSC freq calibration routines Sean Christopherson
2026-05-15 20:06   ` sashiko-bot
2026-05-18 21:59   ` Woodhouse, David
2026-05-20 17:56     ` Sean Christopherson [this message]
2026-05-20 19:04   ` David Woodhouse
2026-05-20 20:44     ` Sean Christopherson
2026-05-20 21:19       ` David Woodhouse
2026-05-20 21:33         ` Sean Christopherson
2026-05-20 21:44           ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 03/41] x86/sev: Mark TSC as reliable when configuring Secure TSC Sean Christopherson
2026-05-20 19:06   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 04/41] x86/sev: Move check for SNP Secure TSC support to tsc_early_init() Sean Christopherson
2026-05-20 19:16   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 05/41] x86/tdx: Override PV calibration routines with CPUID-based calibration Sean Christopherson
2026-05-20 19:52   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 06/41] x86/acrn: Mark TSC frequency as known when using ACRN for calibration Sean Christopherson
2026-05-20 20:01   ` David Woodhouse
2026-05-20 21:02     ` Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 07/41] clocksource: hyper-v: Register sched_clock save/restore iff it's necessary Sean Christopherson
2026-05-20 21:27   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 08/41] clocksource: hyper-v: Drop wrappers to sched_clock save/restore helpers Sean Christopherson
2026-05-20 21:29   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 09/41] clocksource: hyper-v: Don't save/restore TSC offset when using HV sched_clock Sean Christopherson
2026-05-20 21:30   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 10/41] x86/kvmclock: Setup kvmclock for secondary CPUs iff CONFIG_SMP=y Sean Christopherson
2026-05-20 21:45   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 11/41] x86/kvm: Don't disable kvmclock on BSP in syscore_suspend() Sean Christopherson
2026-05-15 20:34   ` sashiko-bot
2026-05-15 22:29     ` Sean Christopherson
2026-05-20 21:51   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 12/41] x86/paravirt: Remove unnecessary PARAVIRT=n stub for paravirt_set_sched_clock() Sean Christopherson
2026-05-20 21:53   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 13/41] x86/paravirt: Move handling of unstable PV clocks into paravirt_set_sched_clock() Sean Christopherson
2026-05-20 21:57   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 14/41] x86/kvmclock: Move sched_clock save/restore helpers up in kvmclock.c Sean Christopherson
2026-05-20 21:59   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 15/41] x86/xen/time: Nullify x86_platform's sched_clock save/restore hooks Sean Christopherson
2026-05-15 19:48   ` sashiko-bot
2026-05-15 22:43     ` Sean Christopherson
2026-05-20 22:11   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 16/41] x86/vmware: Nullify save/restore hooks when using VMware's sched_clock Sean Christopherson
2026-05-15 19:42   ` sashiko-bot
2026-05-20 22:15   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 17/41] x86/tsc: WARN if TSC sched_clock save/restore used with PV sched_clock Sean Christopherson
2026-05-15 19:55   ` sashiko-bot
2026-05-20 22:27   ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 18/41] x86/paravirt: Pass sched_clock save/restore helpers during registration Sean Christopherson
2026-05-15 19:56   ` sashiko-bot
2026-05-15 19:19 ` [PATCH v3 19/41] x86/kvmclock: Move kvm_sched_clock_init() down in kvmclock.c Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 20/41] x86/xen/time: Mark xen_setup_vsyscall_time_info() as __init Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 21/41] x86/pvclock: Mark setup helpers and related various as __init/__ro_after_init Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 22/41] x86/pvclock: WARN if pvclock's valid_flags are overwritten Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 23/41] x86/kvmclock: Refactor handling of PVCLOCK_TSC_STABLE_BIT during kvmclock_init() Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 24/41] timekeeping: Resume clocksources before reading persistent clock Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 25/41] x86/kvmclock: Hook clocksource.suspend/resume when kvmclock isn't sched_clock Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 26/41] x86/kvmclock: WARN if wall clock is read while kvmclock is suspended Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 27/41] x86/kvmclock: Enable kvmclock on APs during onlining if kvmclock isn't sched_clock Sean Christopherson
2026-05-15 19:47   ` sashiko-bot
2026-05-18 23:04     ` Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 28/41] x86/paravirt: Mark __paravirt_set_sched_clock() as __init Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 29/41] x86/paravirt: Plumb a return code into __paravirt_set_sched_clock() Sean Christopherson
2026-05-15 19:48   ` sashiko-bot
2026-05-18 21:14     ` Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 30/41] x86/paravirt: Don't use a PV sched_clock in CoCo guests with trusted TSC Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 31/41] x86/tsc: Pass KNOWN_FREQ and RELIABLE as params to registration Sean Christopherson
2026-05-15 19:45   ` sashiko-bot
2026-05-18 22:18     ` Sean Christopherson
2026-05-19  3:12       ` Michael Kelley
2026-05-20 16:40         ` Sean Christopherson
2026-05-20 19:01           ` Michael Kelley
2026-05-15 19:19 ` [PATCH v3 32/41] x86/tsc: Rejects attempts to override TSC calibration with lesser routine Sean Christopherson
2026-05-15 20:16   ` sashiko-bot
2026-05-18 19:17     ` Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 33/41] x86/kvmclock: Mark TSC as reliable when it's constant and nonstop Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 34/41] KVM: x86: Officially define CPUID 0x40000010 as PV Timing Info (TSC and Bus) Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 35/41] x86/kvmclock: Obtain TSC frequency from CPUID if present Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 36/41] x86/kvmclock: Get local APIC bus frequency from PV CPUID Timing Info Sean Christopherson
2026-05-15 19:55   ` sashiko-bot
2026-05-18 20:57     ` Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 37/41] x86/kvmclock: Use TSC for sched_clock if it's constant and non-stop Sean Christopherson
2026-05-15 20:09   ` sashiko-bot
2026-05-18 20:28     ` Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 38/41] x86/paravirt: kvmclock: Setup kvmclock early iff it's sched_clock Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 39/41] x86/paravirt: Move using_native_sched_clock() stub into timer.h Sean Christopherson
2026-05-15 19:19 ` [PATCH v3 40/41] x86/tsc: Add standalone helper for getting CPU frequency from CPUID Sean Christopherson
2026-05-15 19:51   ` sashiko-bot
2026-05-15 23:04     ` Sean Christopherson
2026-05-16  7:42   ` Paolo Bonzini
2026-05-20 18:50     ` David Woodhouse
2026-05-15 19:19 ` [PATCH v3 41/41] x86/kvmclock: Get CPU base frequency from CPUID when it's available Sean Christopherson
2026-05-15 19:59   ` sashiko-bot
2026-05-20 21:06     ` Sean Christopherson
2026-05-20 18:52   ` David Woodhouse
2026-05-20 19:06     ` Sean Christopherson
2026-05-18 21:11 ` [PATCH v3 00/41] x86: Try to wrangle PV clocks vs. TSC Sean Christopherson
2026-05-18 23:38 ` David Woodhouse
2026-05-20 17:59   ` Sean Christopherson
2026-05-20 18:30     ` David Woodhouse

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