[PATCH 41/78] s390/sclp: improve special wait psw logic

[Michael Roth]

From: Christian Borntraeger <borntraeger@de.ibm.com>

There is a special quiesce PSW that we check for "shutdown". Otherwise disabled
wait is detected as "crashed". Architecturally we must only check PSW bits
116-127. Fix this.

Cc: qemu-stable@nongnu.org
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-Id: <1582204582-22995-1-git-send-email-borntraeger@de.ibm.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Janosch Frank <frankja@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
(cherry picked from commit 8b51c0961cc13e55b26bb6665ec3a341abdc7658)
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 target/s390x/helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/target/s390x/helper.c b/target/s390x/helper.c
index a3a49164e4..6808dfda01 100644
--- a/target/s390x/helper.c
+++ b/target/s390x/helper.c
@@ -89,7 +89,7 @@ hwaddr s390_cpu_get_phys_addr_debug(CPUState *cs, vaddr vaddr)
 static inline bool is_special_wait_psw(uint64_t psw_addr)
 {
     /* signal quiesce */
-    return psw_addr == 0xfffUL;
+    return (psw_addr & 0xfffUL) == 0xfffUL;
 }
 
 void s390_handle_wait(S390CPU *cpu)
-- 
2.17.1