tree cf4f49a36cc28c34a0d829015e00bf309e2f1af7
parent 27406cd50cf6653196eea8ebbb15a75596da01ca
author Jens Freimann <jfrei@linux.vnet.ibm.com> 1429258864 +0200
committer Christian Borntraeger <borntraeger@de.ibm.com> 1431093075 +0200

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>