[Qemu-devel] [PATCH v1 2/5] s390x/css: Use AIS AIRQ injection only if adapter support AIS

[Pierre Morel]

Testing to use Adapter Interrupt suppression or not depend on AIS
being enabled in the kernel.
To implement AIS emulation we must move this test inside the FLIC
dedicated irq_inject function.

Furthermore, a test to verify that the adapter is subject to the AIS
must be added.

Last, there is no need to crash QEMU if the injection failed, the
guest may recover from it.

Signed-off-by: Pierre Morel <address@hidden>
---
 hw/s390x/css.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 901dc6a..6e74a5c 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -672,10 +672,12 @@ void css_adapter_interrupt(CssIoAdapterType type, uint8_t 
isc)
     }
 
     trace_css_adapter_interrupt(isc);
-    if (fs->ais_supported) {
+    /* Use standard IRQ injection for adapters not supporting AIS */
+    if (adapter->flags & S390_ADAPTER_SUPPRESSIBLE) {
+        /* Use AIRQ injection for adapters subject to AIS */
         if (fsc->inject_airq(fs, type, isc, adapter->flags)) {
             error_report("Failed to inject airq with AIS supported");
-            exit(1);
+            /* Report error - guest will handle not receiving interrupts */
         }
     } else {
         s390_io_interrupt(0, 0, 0, io_int_word);
-- 
2.3.0