[PATCH v1 4/5] hw/vfio/ap: Storing event information for an AP configuration change event

[Rorie Reyes]

These functions can be invoked by the function that handles interception
of the CHSC SEI instruction for requests indicating the accessibility of
one or more adjunct processors has changed.

Signed-off-by: Rorie Reyes <rreyes@linux.ibm.com>
---
 hw/vfio/ap.c                 | 37 ++++++++++++++++++++++++++++++++++++
 include/hw/s390x/ap-bridge.h | 17 +++++++++++++++++
 2 files changed, 54 insertions(+)

diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 508c6eed7a..9d1e18f100 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -94,6 +94,43 @@ static void vfio_ap_cfg_chg_notifier_handler(void *opaque)
     css_generate_css_crws(0);
 }
 
+int ap_chsc_sei_nt0_get_event(void *res)
+{
+    APConfigChgEvent *cfg_chg_event = QTAILQ_FIRST(&cfg_chg_events);
+    ChscSeiNt0Res *nt0_res  = (ChscSeiNt0Res *)res;
+    memset(nt0_res, 0, sizeof(*nt0_res));
+    int rc = 1;
+
+    if (cfg_chg_event) {
+        QTAILQ_REMOVE(&cfg_chg_events, cfg_chg_event, next);
+        free(cfg_chg_event);
+
+        /*
+         * If there are any AP configuration change events in the queue,
+         * indicate to the caller that there is pending event info in
+         * the response block
+         */
+        if (!QTAILQ_EMPTY(&cfg_chg_events)) {
+            nt0_res->flags |= PENDING_EVENT_INFO_BITMASK;
+        }
+
+        nt0_res->length = sizeof(ChscSeiNt0Res);
+        nt0_res->code = 1;
+        nt0_res->nt = 0;
+        nt0_res->rs = 5;
+        nt0_res->cc = 3;
+
+        rc = 0;
+    }
+
+    return rc;
+}
+
+int ap_chsc_sei_nt0_have_event(void)
+{
+    return !QTAILQ_EMPTY(&cfg_chg_events);
+}
+
 static bool vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
                                           unsigned int irq, Error **errp)
 {
diff --git a/include/hw/s390x/ap-bridge.h b/include/hw/s390x/ap-bridge.h
index 470e439a98..c9beec3db4 100644
--- a/include/hw/s390x/ap-bridge.h
+++ b/include/hw/s390x/ap-bridge.h
@@ -16,4 +16,21 @@
 
 void s390_init_ap(void);
 
+typedef struct ChscSeiNt0Res {
+    uint16_t length;
+    uint16_t code;
+    uint8_t reserved1;
+    uint16_t reserved2;
+    uint8_t nt;
+#define PENDING_EVENT_INFO_BITMASK 0x80;
+    uint8_t flags;
+    uint8_t reserved3;
+    uint8_t rs;
+    uint8_t cc;
+} QEMU_PACKED ChscSeiNt0Res;
+
+int ap_chsc_sei_nt0_get_event(void *res);
+
+int ap_chsc_sei_nt0_have_event(void);
+
 #endif
-- 
2.39.5 (Apple Git-154)