On 26/07/19 20:30, Thomas Gleixner wrote: > From: Sebastian Andrzej Siewior <[email protected]> > > On PREEMPT_RT enabled kernels unmarked hrtimers are moved into soft > interrupt expiry mode by default. > > While that's not a functional requirement for the KVM local APIC timer > emulation, it's a latency issue which can be avoided by marking the timer > so hard interrupt context expiry is enforced. > > No functional change. > > [ tglx: Split out from larger combo patch. Add changelog. ] > > Signed-off-by: Sebastian Andrzej Siewior <[email protected]> > Signed-off-by: Thomas Gleixner <[email protected]> > Cc: [email protected] > Cc: Paolo Bonzini <[email protected]> > --- > arch/x86/kvm/lapic.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > --- a/arch/x86/kvm/lapic.c > +++ b/arch/x86/kvm/lapic.c > @@ -2302,7 +2302,7 @@ int kvm_create_lapic(struct kvm_vcpu *vc > apic->vcpu = vcpu; > > hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, > - HRTIMER_MODE_ABS); > + HRTIMER_MODE_ABS_HARD); > apic->lapic_timer.timer.function = apic_timer_fn; > if (timer_advance_ns == -1) { > apic->lapic_timer.timer_advance_ns = > LAPIC_TIMER_ADVANCE_ADJUST_INIT; > >
Acked-by: Paolo Bonzini <[email protected]>
