From: =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= <rkrcmar@redhat.com>
Date: Fri, 6 Oct 2017 19:25:54 +0200
Subject: KVM: x86: really disarm lapic timer when clearing TMICT
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Patch-mainline: v4.15-rc1
Git-commit: 5d74a6999368ad1991491b1913bb80faf1925e67
References: bsc#1077761

preemption timer only looks at tscdeadline and could inject already
disarmed timer.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Alexander Graf <agraf@suse.de>
---
 arch/x86/kvm/lapic.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1489,8 +1489,10 @@
 	apic->lapic_timer.period = (u64)kvm_lapic_get_reg(apic, APIC_TMICT)
 		* APIC_BUS_CYCLE_NS * apic->divide_count;
 
-	if (!apic->lapic_timer.period)
+	if (!apic->lapic_timer.period) {
+		apic->lapic_timer.tscdeadline = 0;
 		return false;
+	}
 
 	limit_periodic_timer_frequency(apic);