[RFC PATCH] hw/rtc/mc146818rtc: Drop pre-v3 migration stream support

[Philippe Mathieu-Daudé]

mc146818rtc's migration stream is at version 3 since commit
56038ef6234 ("RTC: Update the RTC clock only when reading it")
from 12 years ago, released in QEMU v1.3.0!
No versioned machines are that old, we can safely remove
support for older streams and the qdev_set_legacy_instance_id()
call.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
RFC to check whether my reasoning is correct or not.

Goal is to remove qdev_set_legacy_instance_id() globally.
---
 hw/rtc/mc146818rtc.c | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/hw/rtc/mc146818rtc.c b/hw/rtc/mc146818rtc.c
index e322fc2ffb9..b7927f7e258 100644
--- a/hw/rtc/mc146818rtc.c
+++ b/hw/rtc/mc146818rtc.c
@@ -819,7 +819,7 @@ static const VMStateDescription 
vmstate_rtc_irq_reinject_on_ack_count = {
 static const VMStateDescription vmstate_rtc = {
     .name = "mc146818rtc",
     .version_id = 3,
-    .minimum_version_id = 1,
+    .minimum_version_id = 3,
     .pre_save = rtc_pre_save,
     .post_load = rtc_post_load,
     .fields = (const VMStateField[]) {
@@ -829,13 +829,13 @@ static const VMStateDescription vmstate_rtc = {
         VMSTATE_TIMER_PTR(periodic_timer, MC146818RtcState),
         VMSTATE_INT64(next_periodic_time, MC146818RtcState),
         VMSTATE_UNUSED(3*8),
-        VMSTATE_UINT32_V(irq_coalesced, MC146818RtcState, 2),
-        VMSTATE_UINT32_V(period, MC146818RtcState, 2),
-        VMSTATE_UINT64_V(base_rtc, MC146818RtcState, 3),
-        VMSTATE_UINT64_V(last_update, MC146818RtcState, 3),
-        VMSTATE_INT64_V(offset, MC146818RtcState, 3),
-        VMSTATE_TIMER_PTR_V(update_timer, MC146818RtcState, 3),
-        VMSTATE_UINT64_V(next_alarm_time, MC146818RtcState, 3),
+        VMSTATE_UINT32(irq_coalesced, MC146818RtcState),
+        VMSTATE_UINT32(period, MC146818RtcState),
+        VMSTATE_UINT64(base_rtc, MC146818RtcState),
+        VMSTATE_UINT64(last_update, MC146818RtcState),
+        VMSTATE_INT64(offset, MC146818RtcState),
+        VMSTATE_TIMER_PTR(update_timer, MC146818RtcState),
+        VMSTATE_UINT64(next_alarm_time, MC146818RtcState),
         VMSTATE_END_OF_LIST()
     },
     .subsections = (const VMStateDescription * const []) {
@@ -929,8 +929,6 @@ static void rtc_realizefn(DeviceState *dev, Error **errp)
     memory_region_add_subregion(&s->io, 0, &s->coalesced_io);
     memory_region_add_coalescing(&s->coalesced_io, 0, 1);
 
-    qdev_set_legacy_instance_id(dev, s->io_base, 3);
-
     object_property_add_tm(OBJECT(s), "date", rtc_get_date);
 
     qdev_init_gpio_out(dev, &s->irq, 1);
-- 
2.47.1