6.6-stable review patch. If anyone has any objections, please let me know.
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From: fuqiang wang fuqiang.wng@gmail.com
commit 9633f180ce994ab293ce4924a9b7aaf4673aa114 upstream.
When restarting an hrtimer to emulate a the guest's APIC timer in periodic mode, explicitly set the expiration using the target expiration computed by advance_periodic_target_expiration() instead of adding the period to the existing timer. This will allow making adjustments to the expiration, e.g. to deal with expirations far in the past, without having to implement the same logic in both advance_periodic_target_expiration() and apic_timer_fn().
Cc: stable@vger.kernel.org Signed-off-by: fuqiang wang fuqiang.wng@gmail.com [sean: split to separate patch, write changelog] Link: https://patch.msgid.link/20251113205114.1647493-3-seanjc@google.com Signed-off-by: Sean Christopherson seanjc@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/lapic.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -2857,7 +2857,7 @@ static enum hrtimer_restart apic_timer_f
if (lapic_is_periodic(apic) && !WARN_ON_ONCE(!apic->lapic_timer.period)) { advance_periodic_target_expiration(apic); - hrtimer_add_expires_ns(&ktimer->timer, ktimer->period); + hrtimer_set_expires(&ktimer->timer, ktimer->target_expiration); return HRTIMER_RESTART; } else return HRTIMER_NORESTART;