+static bool kvm_timer_irq_can_fire(struct arch_timer_context *timer_ctx)
+{
+ return !(timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_IT_MASK) &&
+ (timer_ctx->cnt_ctl & ARCH_TIMER_CTRL_ENABLE);
+}
+
+/*
+ * Returns the earliest expiration time in ns among guest timers.
+ * Note that it will return 0 if none of timers can fire.
+ */
+static u64 kvm_timer_earliest_exp(struct kvm_vcpu *vcpu)
+{
+ u64 min_virt = ULLONG_MAX, min_phys = ULLONG_MAX;
+ struct arch_timer_context *vtimer = vcpu_vtimer(vcpu);
+ struct arch_timer_context *ptimer = vcpu_ptimer(vcpu);
+
+ if (kvm_timer_irq_can_fire(vtimer))
+ min_virt = kvm_timer_compute_delta(vtimer);
+
+ if (kvm_timer_irq_can_fire(ptimer))
+ min_phys = kvm_timer_compute_delta(ptimer);
+
+ /* If none of timers can fire, then return 0 */
+ if ((min_virt == ULLONG_MAX) && (min_phys == ULLONG_MAX))
+ return 0;
+
+ return min(min_virt, min_phys);
+}
+