s390x/kvm: deliver SIGP RESTART directly if stopped

s390x/kvm: deliver SIGP RESTART directly if stopped

According to the PoP, a restart irq has to be delivered "without first honoring
any other pending interruptions", if a cpu is in the STOPPED state.

While it is hard to implement this case in kvm, it can easily be handled in qemu.

Reviewed-by: Thomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jens Freimann <jfrei@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Message-Id: <1424783731-43426-10-git-send-email-jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>