Messages in this thread | | | Date | Fri, 29 Jun 2018 09:30:10 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [PATCH v12 09/11] x86/tsc: prepare for early sched_clock |
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On Thu, 28 Jun 2018, Pavel Tatashin wrote: > On Thu, Jun 28, 2018 at 11:23 AM Thomas Gleixner <tglx@linutronix.de> wrote: > Hi Thomas, > > In addition to above, we have xen hvm: > > setup_arch() > ... > init_hypervisor_platform(); > x86_init.hyper.init_platform(); > xen_hvm_guest_init() > xen_hvm_init_time_ops();
Duh. Missed that completely.
> ... > tsc_early_delay_calibrate(); > tsc_khz = x86_platform.calibrate_tsc(); == xen_tsc_khz() > ... > > Which works early. > > So, what should we do with xen, which seems to be the only platform > that would provide different tsc frequency early and late, because of > different calibration method?
Fix it? I have no idea why XEN has two variants of the scheme and I neither have a clue why the KVM clock stuff is late.
Thanks,
tglx
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