[Qemu-devel] [PULL 03/23] s390x/event-facility: fix receive mask check

[Cornelia Huck <cornelia.huck@de.ibm.com>]

For selective read event, we need to check if any event is requested
that is not active instead of whether none of the requested events is
active.

Reviewed-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Reviewed-by: Eric Farman <farman@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
---
 hw/s390x/event-facility.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c
index 0c700ef..1ca6544 100644
--- a/hw/s390x/event-facility.c
+++ b/hw/s390x/event-facility.c
@@ -240,12 +240,13 @@ static void read_event_data(SCLPEventFacility *ef, SCCB *sccb)
         sclp_active_selection_mask = sclp_cp_receive_mask;
         break;
     case SCLP_SELECTIVE_READ:
-        if (!(sclp_cp_receive_mask & be32_to_cpu(red->mask))) {
+        sclp_active_selection_mask = be32_to_cpu(red->mask);
+        if (!sclp_cp_receive_mask ||
+            (sclp_active_selection_mask & ~sclp_cp_receive_mask)) {
             sccb->h.response_code =
                     cpu_to_be16(SCLP_RC_INVALID_SELECTION_MASK);
             goto out;
         }
-        sclp_active_selection_mask = be32_to_cpu(red->mask);
         break;
     default:
         sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_FUNCTION);
-- 
2.5.1