[PATCH] KVM: LAPIC: Reset timer_advance_ns to 1000 after adaptive tuning goes insane

[Wanpeng Li]

From: Wanpeng Li <wanpen...@tencent.com>

Reset timer_advance_ns to the default value 1000ns after adaptive tuning 
goes insane which can happen sporadically in product environment.

Cc: Paolo Bonzini <pbonz...@redhat.com>
Cc: Radim Kr??m???? <rkrc...@redhat.com>
Signed-off-by: Wanpeng Li <wanpen...@tencent.com>
---
 arch/x86/kvm/lapic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 05d8934..454d3dd 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1549,7 +1549,7 @@ static inline void adjust_lapic_timer_advance(struct 
kvm_vcpu *vcpu,
        if (abs(advance_expire_delta) < LAPIC_TIMER_ADVANCE_ADJUST_DONE)
                apic->lapic_timer.timer_advance_adjust_done = true;
        if (unlikely(timer_advance_ns > 5000)) {
-               timer_advance_ns = 0;
+               timer_advance_ns = 1000;
                apic->lapic_timer.timer_advance_adjust_done = true;
        }
        apic->lapic_timer.timer_advance_ns = timer_advance_ns;
-- 
2.7.4