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

[Anthony Krowiak <akrowiak@linux.ibm.com>]

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 <rreyes@linux.ibm.com>
> Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
> Tested-by: Anthony Krowiak <akrowiak@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;