[PATCH v1 2/3] hw/s390x: add CPI values to QOM

[Shalini Chellathurai Saroja]

This commit adds the firmware control-program
identifiers received from a KVM guest via the
SCLP event type Control-Program Identification to QOM.
A timestamp in which the data is received is also
added to QOM.

Example:
virsh # qemu-monitor-command vm --pretty '{
"execute":"qom-get","arguments": {
"path": "/machine", "property": "s390-cpi"}}'
{
  "return": {
    "timestamp": 1711620874948254000,
    "system-level": "0x50e00",
    "sysplex-name": "SYSPLEX ",
    "system-name": "TESTVM  ",
    "system-type": "LINUX   "
  },
  "id": "libvirt-15"
}

Signed-off-by: Shalini Chellathurai Saroja <shalini@linux.ibm.com>
---
 hw/s390x/s390-virtio-ccw.c         | 26 ++++++++++++++++++++++++++
 hw/s390x/sclpcpi.c                 | 10 ++++++++++
 include/hw/s390x/s390-virtio-ccw.h |  8 ++++++++
 qapi/machine.json                  | 24 ++++++++++++++++++++++++
 4 files changed, 68 insertions(+)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 38aeba14ee..35fb523af9 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -49,6 +49,7 @@
 #include "hw/virtio/virtio-md-pci.h"
 #include "hw/s390x/virtio-ccw-md.h"
 #include CONFIG_DEVICES
+#include "qapi/qapi-visit-machine.h"
 
 static Error *pv_mig_blocker;
 
@@ -773,6 +774,25 @@ static void machine_set_loadparm(Object *obj, Visitor *v,
     s390_ipl_fmt_loadparm(ms->loadparm, val, errp);
 }
 
+static void machine_get_cpi(Object *obj, Visitor *v,
+                             const char *name, void *opaque, Error **errp)
+{
+    S390CcwMachineState *ms = S390_CCW_MACHINE(obj);
+    S390Cpi *cpi;
+    cpi = &(S390Cpi){
+        .system_type = g_strndup((char *) ms->cpi.system_type,
+                       sizeof(ms->cpi.system_type)),
+        .system_name = g_strndup((char *) ms->cpi.system_name,
+                       sizeof(ms->cpi.system_name)),
+        .system_level = g_strdup_printf("0x%lx", ms->cpi.system_level),
+        .sysplex_name = g_strndup((char *) ms->cpi.sysplex_name,
+                        sizeof(ms->cpi.sysplex_name)),
+        .timestamp = ms->cpi.timestamp
+    };
+
+    visit_type_S390Cpi(v, name, &cpi, &error_abort);
+}
+
 static void ccw_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
@@ -826,6 +846,12 @@ static void ccw_machine_class_init(ObjectClass *oc, void 
*data)
             "Up to 8 chars in set of [A-Za-z0-9. ] (lower case chars converted"
             " to upper case) to pass to machine loader, boot manager,"
             " and guest kernel");
+    object_class_property_add(oc, "s390-cpi", "S390Cpi",
+        machine_get_cpi, NULL, NULL, NULL);
+    object_class_property_set_description(oc, "s390-cpi",
+        "Control-progam identifiers provide data about the guest "
+        "operating system");
+
 }
 
 static inline void s390_machine_initfn(Object *obj)
diff --git a/hw/s390x/sclpcpi.c b/hw/s390x/sclpcpi.c
index 64bc730f47..75101b8f61 100644
--- a/hw/s390x/sclpcpi.c
+++ b/hw/s390x/sclpcpi.c
@@ -20,8 +20,11 @@
  */
 
 #include "qemu/osdep.h"
+#include "qemu/timer.h"
 #include "hw/s390x/sclp.h"
 #include "hw/s390x/event-facility.h"
+#include "hw/s390x/ebcdic.h"
+#include "hw/s390x/s390-virtio-ccw.h"
 
 typedef struct Data {
     uint8_t id_format;
@@ -60,6 +63,13 @@ static sccb_mask_t receive_mask(void)
 static int write_event_data(SCLPEvent *event, EventBufferHeader *evt_buf_hdr)
 {
     CPI *cpi = container_of(evt_buf_hdr, CPI, ebh);
+    S390CcwMachineState *ms = S390_CCW_MACHINE(qdev_get_machine());
+
+    ascii_put(ms->cpi.system_type, (char *)cpi->data.system_type, 8);
+    ascii_put(ms->cpi.system_name, (char *)cpi->data.system_name, 8);
+    ascii_put(ms->cpi.sysplex_name, (char *)cpi->data.sysplex_name, 8);
+    ms->cpi.system_level = cpi->data.system_level;
+    ms->cpi.timestamp = qemu_clock_get_ns(QEMU_CLOCK_HOST);
 
     cpi->ebh.flags = SCLP_EVENT_BUFFER_ACCEPTED;
     return SCLP_RC_NORMAL_COMPLETION;
diff --git a/include/hw/s390x/s390-virtio-ccw.h 
b/include/hw/s390x/s390-virtio-ccw.h
index 686d9497d2..c4212ff857 100644
--- a/include/hw/s390x/s390-virtio-ccw.h
+++ b/include/hw/s390x/s390-virtio-ccw.h
@@ -19,6 +19,13 @@
 
 OBJECT_DECLARE_TYPE(S390CcwMachineState, S390CcwMachineClass, S390_CCW_MACHINE)
 
+typedef struct Cpi {
+    uint8_t system_type[8];
+    uint8_t system_name[8];
+    uint64_t system_level;
+    uint8_t sysplex_name[8];
+    uint64_t timestamp;
+} QEMU_PACKED Cpi;
 
 struct S390CcwMachineState {
     /*< private >*/
@@ -33,6 +40,7 @@ struct S390CcwMachineState {
     uint64_t max_pagesize;
 
     SCLPDevice *sclp;
+    Cpi cpi;
 };
 
 static inline uint64_t s390_get_memory_limit(S390CcwMachineState *s390ms)
diff --git a/qapi/machine.json b/qapi/machine.json
index a6b8795b09..9dcd2790eb 100644
--- a/qapi/machine.json
+++ b/qapi/machine.json
@@ -1898,3 +1898,27 @@
 { 'command': 'x-query-interrupt-controllers',
   'returns': 'HumanReadableText',
   'features': [ 'unstable' ]}
+
+##
+# @S390Cpi:
+#
+# Control-program identifiers provide data about Linux instance.
+#
+# @system-type: operating system of Linux instance
+#
+# @system-name: system name of Linux instance
+#
+# @system-level: distribution and kernel version of Linux instance
+#
+# @sysplex-name: sysplex name of Linux instance
+#
+# @timestamp: latest update of CPI data
+#
+# Since: 9.2
+##
+{ 'struct': 'S390Cpi', 'data': {
+     'system-type': 'str',
+     'system-name': 'str',
+     'system-level': 'str',
+     'sysplex-name': 'str',
+     'timestamp': 'uint64' } }
-- 
2.47.0