On 3/11/25 11:16 AM, Rorie Reyes wrote:
> 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>
Reviewed-by: Anthony Krowiak <akrowiak@linux.ibm.com>
> ---
> hw/vfio/ap.c | 39 ++++++++++++++++++++++++++++++++++++
> include/hw/s390x/ap-bridge.h | 22 ++++++++++++++++++++
> 2 files changed, 61 insertions(+)
>
> diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
> index 3fa986ca45..4da246c538 100644
> --- a/hw/vfio/ap.c
> +++ b/hw/vfio/ap.c
> @@ -96,6 +96,45 @@ static void vfio_ap_cfg_chg_notifier_handler(void *opaque)
>
> }
>
> +int ap_chsc_sei_nt0_get_event(void *res)
> +{
> + ChscSeiNt0Res *nt0_res = (ChscSeiNt0Res *)res;
> + APConfigChgEvent *cfg_chg_event;
> +
> + if (!ap_chsc_sei_nt0_have_event()) {
> + return 1;
> + }
> +
> + cfg_chg_event = QTAILQ_FIRST(&cfg_chg_events);
> + memset(nt0_res, 0, sizeof(*nt0_res));
> +
> + QTAILQ_REMOVE(&cfg_chg_events, cfg_chg_event, next);
> + g_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 (ap_chsc_sei_nt0_have_event()) {
> + nt0_res->flags |= PENDING_EVENT_INFO_BITMASK;
> + }
> +
> + nt0_res->length = sizeof(ChscSeiNt0Res);
> + nt0_res->code = NT0_RES_RESPONSE_CODE;
> + nt0_res->nt = NT0_RES_NT_DEFAULT;
> + nt0_res->rs = NT0_RES_RS_AP_CHANGE;
> + nt0_res->cc = NT0_RES_CC_AP_CHANGE;
> +
> + return 0;
> +
> +}
> +
> +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..f4d838bf99 100644
> --- a/include/hw/s390x/ap-bridge.h
> +++ b/include/hw/s390x/ap-bridge.h
> @@ -16,4 +16,26 @@
>
> 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;
> +
> +#define NT0_RES_RESPONSE_CODE 1;
> +#define NT0_RES_NT_DEFAULT 0;
> +#define NT0_RES_RS_AP_CHANGE 5;
> +#define NT0_RES_CC_AP_CHANGE 3;
> +
> +int ap_chsc_sei_nt0_get_event(void *res);
> +
> +int ap_chsc_sei_nt0_have_event(void);
> +
> #endif