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KVM: x86: thoroughly disarm LAPIC timer around TSC deadline switch

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Our routines look at tscdeadline and period when deciding state of a
timer.  The timer is disarmed when switching between TSC deadline and
other modes, so we should set everything to disarmed state.

Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
Reviewed-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2017-10-06 19:25:55 +02:00 committed by Paolo Bonzini
parent 5d74a69993
commit 4427593258
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/lapic.c
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@ -1330,8 +1330,10 @@ static void apic_update_lvtt(struct kvm_lapic *apic)
if (apic->lapic_timer.timer_mode != timer_mode) {
if (apic_lvtt_tscdeadline(apic) != (timer_mode ==
APIC_LVT_TIMER_TSCDEADLINE)) {
kvm_lapic_set_reg(apic, APIC_TMICT, 0);
hrtimer_cancel(&apic->lapic_timer.timer);
kvm_lapic_set_reg(apic, APIC_TMICT, 0);
apic->lapic_timer.period = 0;
apic->lapic_timer.tscdeadline = 0;
}
apic->lapic_timer.timer_mode = timer_mode;
limit_periodic_timer_frequency(apic);