On 5/23/25 18:03, 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 <rre...@linux.ibm.com>
---
hw/vfio/ap.c | 53 ++++++++++++++++++++++++++++++++++++
include/hw/s390x/ap-bridge.h | 39 ++++++++++++++++++++++++++
2 files changed, 92 insertions(+)
diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c
index fc435f5c5b..97a42a575a 100644
--- a/hw/vfio/ap.c
+++ b/hw/vfio/ap.c
@@ -10,6 +10,7 @@
* directory.
*/
+#include <stdbool.h>
#include "qemu/osdep.h"
#include CONFIG_DEVICES /* CONFIG_IOMMUFD */
#include <linux/vfio.h>
@@ -48,6 +49,8 @@ typedef struct APConfigChgEvent {
static QTAILQ_HEAD(, APConfigChgEvent) cfg_chg_events =
QTAILQ_HEAD_INITIALIZER(cfg_chg_events);
+static QemuMutex cfg_chg_events_lock;
+
OBJECT_DECLARE_SIMPLE_TYPE(VFIOAPDevice, VFIO_AP_DEVICE)
static void vfio_ap_compute_needs_reset(VFIODevice *vdev)
@@ -96,6 +99,49 @@ 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;
+
+ qemu_mutex_lock(&cfg_chg_events_lock);
please consider using WITH_QEMU_LOCK_GUARD()
+ if (!ap_chsc_sei_nt0_have_event()) {
+ qemu_mutex_unlock(&cfg_chg_events_lock);
+ return EVENT_INFORMATION_NOT_STORED;
+ }
+
+ cfg_chg_event = QTAILQ_FIRST(&cfg_chg_events);
+ QTAILQ_REMOVE(&cfg_chg_events, cfg_chg_event, next);
+
+ qemu_mutex_unlock(&cfg_chg_events_lock);
+
+ memset(nt0_res, 0, sizeof(*nt0_res));
+ 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 EVENT_INFORMATION_STORED;
+}
+
+bool ap_chsc_sei_nt0_have_event(void)
hmm, no locking ?
+{
+ return !QTAILQ_EMPTY(&cfg_chg_events);
+}
+
static bool vfio_ap_register_irq_notifier(VFIOAPDevice *vapdev,
unsigned int irq, Error **errp)
{
@@ -192,6 +238,13 @@ static void vfio_ap_realize(DeviceState *dev, Error **errp)
VFIOAPDevice *vapdev = VFIO_AP_DEVICE(dev);
VFIODevice *vbasedev = &vapdev->vdev;
+ static bool lock_initialized;
+
+ if (!lock_initialized) {
+ qemu_mutex_init(&cfg_chg_events_lock);
+ lock_initialized = true;
+ }
this could be replaced with a constructor routine. See hyperv.
Thanks,
C.
if (!vfio_device_get_name(vbasedev, errp)) {
return;
}
diff --git a/include/hw/s390x/ap-bridge.h b/include/hw/s390x/ap-bridge.h
index 470e439a98..7efc52928d 100644
--- a/include/hw/s390x/ap-bridge.h
+++ b/include/hw/s390x/ap-bridge.h
@@ -16,4 +16,43 @@
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
+
+#define EVENT_INFORMATION_NOT_STORED 1
+#define EVENT_INFORMATION_STORED 0
+
+/**
+ * ap_chsc_sei_nt0_get_event - Retrieve the next pending AP config
+ * change event
+ * @res: Pointer to a ChscSeiNt0Res struct to be filled with event
+ * data
+ *
+ * This function checks for any pending AP config change events and,
+ * if present, populates the provided response structure with the
+ * appropriate SEI NT0 fields.
+ *
+ * Return:
+ * EVENT_INFORMATION_STORED - An event was available and written to @res
+ * EVENT_INFORMATION_NOT_STORED - No event was available
+ */
+int ap_chsc_sei_nt0_get_event(void *res);
+
+bool ap_chsc_sei_nt0_have_event(void);
+> #endif
