[patch 07/12] KVM: LAPIC: Mark hrtimer to expire in hard interrupt context

[Thomas Gleixner]

From: Sebastian Andrzej Siewior <bige...@linutronix.de>

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 <bige...@linutronix.de>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Cc: k...@vger.kernel.org
Cc: Paolo Bonzini <pbonz...@redhat.com>
---
 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;