tree dd36477016aef39db6ab17926f0ff488b79ebd5b
parent d614be05c8b73033fa141c2f4559c117578b9171
author David Hildenbrand <dahi@linux.vnet.ibm.com> 1413293370 +0200
committer Christian Borntraeger <borntraeger@de.ibm.com> 1422015936 +0100

KVM: s390: only one external call may be pending at a time

Only one external call may be pending at a vcpu at a time. For this
reason, we have to detect whether the SIGP externcal call interpretation
facility is available. If so, all external calls have to be injected
using this mechanism.

SIGP EXTERNAL CALL orders have to return whether another external
call is already pending. This check was missing until now.

SIGP SENSE hasn't returned yet in all conditions whether an external
call was pending.

If a SIGP EXTERNAL CALL irq is to be injected and one is already
pending, -EBUSY is returned.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>