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SubjectRe: [PATCH 3/3] KVM: x86: thoroughly disarm LAPIC timer around TSC deadline switch
2017-10-07 1:25 GMT+08:00 Radim Krčmář <rkrcmar@redhat.com>:
> 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>

> ---
> arch/x86/kvm/lapic.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
> index 96ade848ae0b..a778f1ae2927 100644
> --- a/arch/x86/kvm/lapic.c
> +++ b/arch/x86/kvm/lapic.c
> @@ -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);
> --
> 2.14.2
>

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