From: Radim Krčmář <rkrcmar@redhat.com>
Date: Fri, 6 Oct 2017 17:25:54 +0000 (+0200)
Subject: KVM: x86: really disarm lapic timer when clearing TMICT
X-Git-Tag: v4.15-rc1~79^2~21
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=5d74a6999368ad1991491b1913bb80faf1925e67;p=linux-block.git

KVM: x86: really disarm lapic timer when clearing TMICT

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>
---

diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
index 39c1ae11ce1d..96ade848ae0b 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -1489,8 +1489,10 @@ static bool set_target_expiration(struct kvm_lapic *apic)
 	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);