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apic: Report current_count via 'info lapic'

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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>
This commit is contained in:
Jan Kiszka 2020-02-07 07:43:42 +01:00 • committed by Paolo Bonzini
parent 86f13ef318
commit 6e083c0de4
4 changed files with 23 additions and 20 deletions
Download patch file Download diff file Expand all files Collapse all files

18
hw/intc/apic.c
View file

@ -615,24 +615,6 @@ int apic_accept_pic_intr(DeviceState *dev)
return 0; 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) static void apic_timer_update(APICCommonState *s, int64_t current_time)
{ {
if (apic_next_timer(s, current_time)) { if (apic_next_timer(s, current_time)) {

19
hw/intc/apic_common.c
View file

@ -189,6 +189,25 @@ bool apic_next_timer(APICCommonState *s, int64_t current_time)
return true; 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) void apic_init_reset(DeviceState *dev)
{ {
APICCommonState *s; APICCommonState *s;

1
include/hw/i386/apic_internal.h
View file

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

5
target/i386/helper.c
View file

@ -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("LVTTHMR", lvt[APIC_LVT_THERMAL], false);
dump_apic_lvt("LVTT", lvt[APIC_LVT_TIMER], true); 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, s->divide_conf & APIC_DCR_MASK,
divider_conf(s->divide_conf), 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", qemu_printf("SPIV\t 0x%08x APIC %s, focus=%s, spurious vec %u\n",
s->spurious_vec, s->spurious_vec,