Re: [PATCH v1 3/5] hw/vfio/ap: store object indicating AP config changed in a queue

[Anthony Krowiak]

On 1/7/25 1:43 PM, Rorie Reyes wrote:
Creates an object indicating that an AP configuration change event
has been received and stores it in a queue. These objects will later
be used to store event information for an AP configuration change
when the CHSC instruction is intercepted.

Signed-off-by: Rorie Reyes <rre...@linux.ibm.com>
Reviewed-by: Anthony Krowiak <akrow...@linux.ibm.com>
Tested-by: Anthony Krowiak <akrow...@linux.ibm.com>
---
  hw/vfio/ap.c | 10 ++++++++++
  1 file changed, 10 insertions(+)

diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index 533cadb2dd..508c6eed7a 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -41,6 +41,13 @@ struct VFIOAPDevice {
      EventNotifier cfg_notifier;
  };
  
+typedef struct APConfigChgEvent {
+    QTAILQ_ENTRY(APConfigChgEvent) next;
+} APConfigChgEvent;
+
+QTAILQ_HEAD(, APConfigChgEvent) cfg_chg_events =
+    QTAILQ_HEAD_INITIALIZER(cfg_chg_events);
+
  OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE)
  
  static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
@@ -76,6 +83,9 @@ static void vfio_ap_cfg_chg_notifier_handler(void *opaque)
  {
      VFIOAPDevice *vapdev = opaque;
  
+    APConfigChgEvent *new_event = g_new0(APConfigChgEvent, 1);
+
+    QTAILQ_INSERT_TAIL(&cfg_chg_events, new_event, next);

I didn't notice this before giving my r-b, but I don't think new_event 
should be
inserted into the queue until the 'event_notifier_test_and_clear' below
passes.

      if (!event_notifier_test_and_clear(&vapdev->cfg_notifier)) {
          warn_report("Event notifier not initialized");
          return;