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x86/xen/time: set pvclock flags on xen_time_init()
Specifically check for PVCLOCK_TSC_STABLE_BIT and if this bit is set, then set it too on pvclock flags. This allows Xen clocksource to use it and thus speeding up xen_clocksource_read() callers (i.e. sched_clock()) Signed-off-by: Joao Martins <joao.m.martins@oracle.com> Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
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@ -372,6 +372,7 @@ static const struct pv_time_ops xen_time_ops __initconst = {
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static void __init xen_time_init(void)
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{
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struct pvclock_vcpu_time_info *pvti;
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int cpu = smp_processor_id();
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struct timespec tp;
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@ -395,6 +396,14 @@ static void __init xen_time_init(void)
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setup_force_cpu_cap(X86_FEATURE_TSC);
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/*
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* We check ahead on the primary time info if this
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* bit is supported hence speeding up Xen clocksource.
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*/
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pvti = &__this_cpu_read(xen_vcpu)->time;
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if (pvti->flags & PVCLOCK_TSC_STABLE_BIT)
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pvclock_set_flags(PVCLOCK_TSC_STABLE_BIT);
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xen_setup_runstate_info(cpu);
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xen_setup_timer(cpu);
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xen_setup_cpu_clockevents();
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