KVM: s390: optimize interrupt handling round trip time

We can avoid checking guest control registers and guest PSW as well
as all the masking and calculations on the interrupt masks when
no interrupts are pending.

Also, the check for IRQ_PEND_COUNT can be removed, because we won't
enter the while loop if no interrupts are pending and invalid interrupt
types can't be injected.

Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Dominik Dingel <dingel@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>

diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c
index 2836b25f63d3b883a33d607c0d45866af41c4270..acf4a4e660c0e91b05aa81f72af6ae4c9d1a6441 100644 (file)
--- a/arch/s390/kvm/interrupt.c
+++ b/arch/s390/kvm/interrupt.c
@@ -134,6 +134,8 @@ static unsigned long deliverable_irqs(struct kvm_vcpu *vcpu)
 
        active_mask = pending_local_irqs(vcpu);
        active_mask |= pending_floating_irqs(vcpu);
+       if (!active_mask)
+               return 0;
 
        if (psw_extint_disabled(vcpu))
                active_mask &= ~IRQ_PEND_EXT_MASK;
@@ -941,12 +943,9 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
        if (cpu_timer_irq_pending(vcpu))
                set_bit(IRQ_PEND_EXT_CPU_TIMER, &li->pending_irqs);
 
-       do {
-               irqs = deliverable_irqs(vcpu);
+       while ((irqs = deliverable_irqs(vcpu)) && !rc) {
                /* bits are in the order of interrupt priority */
                irq_type = find_first_bit(&irqs, IRQ_PEND_COUNT);
-               if (irq_type == IRQ_PEND_COUNT)
-                       break;
                if (is_ioirq(irq_type)) {
                        rc = __deliver_io(vcpu, irq_type);
                } else {
@@ -958,9 +957,7 @@ int __must_check kvm_s390_deliver_pending_interrupts(struct kvm_vcpu *vcpu)
                        }
                        rc = func(vcpu);
                }
-               if (rc)
-                       break;
-       } while (!rc);
+       }
 
        set_intercept_indicators(vcpu);