s390x/kvm: helper to set the SIGP status in SigpInfo

Whenever we set the SIGP status in the status register, we have to wipe out
the lower 4 bytes and keep the higher 4 bytes. Also the condition code will
always be set to STATUS_STORED.

Let's introduce the wrapper for SigpInfo, as this will avoid most duplicate
code in the future.

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: <1424783731-43426-5-git-send-email-jfrei@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>

1 files changed, 8 insertions, 3 deletions

diff --git a/target-s390x/kvm.c b/target-s390x/kvm.c
index aaf703e..28d26c1 100644
--- a/target-s390x/kvm.c
+++ b/target-s390x/kvm.c
@@ -1118,6 +1118,13 @@ typedef struct SigpInfo {
     uint64_t *status_reg;
 } SigpInfo;
 
+static void set_sigp_status(SigpInfo *si, uint64_t status)
+{
+    *si->status_reg &= 0xffffffff00000000ULL;
+    *si->status_reg |= status;
+    si->cc = SIGP_CC_STATUS_STORED;
+}
+
 static void sigp_start(void *arg)
 {
     SigpInfo *si = arg;
@@ -1202,9 +1209,7 @@ static int handle_sigp_single_dst(S390CPU *dst_cpu, uint8_t order,
         break;
     default:
         DPRINTF("KVM: unknown SIGP: 0x%x\n", order);
-        *status_reg &= 0xffffffff00000000ULL;
-        *status_reg |= SIGP_STAT_INVALID_ORDER;
-        si.cc = SIGP_CC_STATUS_STORED;
+        set_sigp_status(&si, SIGP_STAT_INVALID_ORDER);
     }
 
     return si.cc;