apic: Report current_count via 'info lapic'

This is helpful when debugging stuck guest timers.

As we need apic_get_current_count for that, and it is really not
emulation specific, move it to apic_common.c and export it. Fix its
style at this chance as well.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <e00e2896-ca5b-a929-de7a-8e5762f0c1c2@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

hw/intc/apic.c

@@ -615,24 +615,6 @@ int apic_accept_pic_intr(DeviceState *dev)
     return 0;
 }
 
-static uint32_t apic_get_current_count(APICCommonState *s)
-{
-    int64_t d;
-    uint32_t val;
-    d = (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - s->initial_count_load_time) >>
-        s->count_shift;
-    if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
-        /* periodic */
-        val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
-    } else {
-        if (d >= s->initial_count)
-            val = 0;
-        else
-            val = s->initial_count - d;
-    }
-    return val;
-}
-
 static void apic_timer_update(APICCommonState *s, int64_t current_time)
 {
     if (apic_next_timer(s, current_time)) {

hw/intc/apic_common.c

@@ -189,6 +189,25 @@ bool apic_next_timer(APICCommonState *s, int64_t current_time)
     return true;
 }
 
+uint32_t apic_get_current_count(APICCommonState *s)
+{
+    int64_t d;
+    uint32_t val;
+    d = (qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) - s->initial_count_load_time) >>
+        s->count_shift;
+    if (s->lvt[APIC_LVT_TIMER] & APIC_LVT_TIMER_PERIODIC) {
+        /* periodic */
+        val = s->initial_count - (d % ((uint64_t)s->initial_count + 1));
+    } else {
+        if (d >= s->initial_count) {
+            val = 0;
+        } else {
+            val = s->initial_count - d;
+        }
+    }
+    return val;
+}
+
 void apic_init_reset(DeviceState *dev)
 {
     APICCommonState *s;

include/hw/i386/apic_internal.h

@@ -211,6 +211,7 @@ void vapic_report_tpr_access(DeviceState *dev, CPUState *cpu, target_ulong ip,
                              TPRAccess access);
 
 int apic_get_ppr(APICCommonState *s);
+uint32_t apic_get_current_count(APICCommonState *s);
 
 static inline void apic_set_bit(uint32_t *tab, int index)
 {

target/i386/helper.c

@@ -370,10 +370,11 @@ void x86_cpu_dump_local_apic_state(CPUState *cs, int flags)
     dump_apic_lvt("LVTTHMR", lvt[APIC_LVT_THERMAL], false);
     dump_apic_lvt("LVTT", lvt[APIC_LVT_TIMER], true);
 
-    qemu_printf("Timer\t DCR=0x%x (divide by %u) initial_count = %u\n",
+    qemu_printf("Timer\t DCR=0x%x (divide by %u) initial_count = %u"
+                " current_count = %u\n",
                 s->divide_conf & APIC_DCR_MASK,
                 divider_conf(s->divide_conf),
-                s->initial_count);
+                s->initial_count, apic_get_current_count(s));
 
     qemu_printf("SPIV\t 0x%08x APIC %s, focus=%s, spurious vec %u\n",
                 s->spurious_vec,