[Qemu-devel] [PATCHv3] add "info ioapic" monitor command

[Gleb Natapov <gleb@redhat.com>]

Knowing ioapic configuration is very useful for the poor soles
how need to debug guest occasionally.

Signed-off-by: Gleb Natapov <gleb@redhat.com>
diff --git a/hw/ioapic.c b/hw/ioapic.c
index b0ad78f..3afb2c4 100644
--- a/hw/ioapic.c
+++ b/hw/ioapic.c
@@ -24,6 +24,8 @@
 #include "pc.h"
 #include "qemu-timer.h"
 #include "host-utils.h"
+#include "monitor.h"
+#include "qemu-objects.h"
 
 //#define DEBUG_IOAPIC
 
@@ -50,6 +52,8 @@ struct IOAPICState {
     uint64_t ioredtbl[IOAPIC_NUM_PINS];
 };
 
+static struct IOAPICState *ioapic;
+
 static void ioapic_service(IOAPICState *s)
 {
     uint8_t i;
@@ -232,7 +236,7 @@ qemu_irq *ioapic_init(void)
     qemu_irq *irq;
     int io_memory;
 
-    s = qemu_mallocz(sizeof(IOAPICState));
+    ioapic = s = qemu_mallocz(sizeof(IOAPICState));
     ioapic_reset(s);
 
     io_memory = cpu_register_io_memory(ioapic_mem_read,
@@ -245,3 +249,70 @@ qemu_irq *ioapic_init(void)
 
     return irq;
 }
+
+static void qemu_ioapic_qlist_iter(QObject *data, void *opaque)
+{
+    QDict *qdict = qobject_to_qdict(data);
+    Monitor *mon = opaque;
+
+    monitor_printf(mon, "%2"PRId64": ", qdict_get_int(qdict, "index"));
+    if (qdict_get_bool(qdict, "masked")) {
+        monitor_printf(mon, "masked\n");
+    } else {
+        monitor_printf(mon, "vec=%3"PRId64" %s %s acive-%s %s dest=%"PRId64"\n",
+                       qdict_get_int(qdict, "vector"),
+                       qdict_get_str(qdict, "delivery_mode"),
+                       qdict_get_str(qdict, "dest_mode"),
+                       qdict_get_str(qdict, "polarity"),
+                       qdict_get_str(qdict, "trig_mode"),
+                       qdict_get_int(qdict, "destination"));
+    }
+}
+
+void monitor_print_ioapic(Monitor *mon, const QObject *ret_data)
+{
+    qlist_iter(qobject_to_qlist(ret_data), qemu_ioapic_qlist_iter, mon);
+}
+
+static const char *delivery_mode_string[] = {"fixed", "lowprio", "smi", "res",
+                                             "nmi", "init", "res", "extint"};
+
+void do_info_ioapic(Monitor *mon, QObject **ret_data)
+{
+    int i;
+    QList *list;
+
+    *ret_data = NULL;
+
+    if (!ioapic)
+        return;
+
+    list = qlist_new();
+
+    for (i = 0; i < IOAPIC_NUM_PINS; i++) {
+        QObject *obj;
+        uint64 e = ioapic->ioredtbl[i];
+        if (e & IOAPIC_LVT_MASKED) {
+            obj = qobject_from_jsonf("{'index': %d, 'masked': true}", i);
+        } else {
+            uint8_t vec = e & 0xff;
+            uint8_t trig_mode = ((e >> 15) & 1);
+            uint8_t dest = e >> 56;
+            uint8_t dest_mode = (e >> 11) & 1;
+            uint8_t delivery_mode = (e >> 8) & 7;
+            uint8_t polarity = (e >> 13) & 1;
+            obj = qobject_from_jsonf("{'index': %d, 'masked': false,"
+                                     "'vector': %d, 'delivery_mode': %s,"
+                                     "'dest_mode': %s, 'polarity': %s,"
+                                     "'trig_mode': %s, 'destination': %d}",
+                                     i, vec,
+                                     delivery_mode_string[delivery_mode],
+                                     dest_mode ? "logical":"physical",
+                                     polarity ? "low" : "high",
+                                     trig_mode ? "level": "edge",
+                                     dest);
+        }
+        qlist_append_obj(list, obj);
+    }
+    *ret_data = QOBJECT(list);
+}
diff --git a/hw/pc.h b/hw/pc.h
index 03ffc91..3e39444 100644
--- a/hw/pc.h
+++ b/hw/pc.h
@@ -2,6 +2,7 @@
 #define HW_PC_H
 
 #include "qemu-common.h"
+#include "qobject.h"
 
 /* PC-style peripherals (also used by other machines).  */
 
@@ -45,6 +46,8 @@ int apic_accept_pic_intr(CPUState *env);
 void apic_deliver_pic_intr(CPUState *env, int level);
 int apic_get_interrupt(CPUState *env);
 qemu_irq *ioapic_init(void);
+void do_info_ioapic(Monitor *mon, QObject **ret_data);
+void monitor_print_ioapic(Monitor *mon, const QObject *data);
 void ioapic_set_irq(void *opaque, int vector, int level);
 void apic_reset_irq_delivered(void);
 int apic_get_irq_delivered(void);
diff --git a/monitor.c b/monitor.c
index c0dc48e..367e330 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2625,6 +2625,14 @@ static const mon_cmd_t info_cmds[] = {
         .mhandler.info = do_info_roms,
     },
     {
+        .name       = "ioapic",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show ioapic config",
+        .user_print = monitor_print_ioapic,
+        .mhandler.info_new = do_info_ioapic,
+    },
+    {
         .name       = NULL,
     },
 };
--
			Gleb.