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[Qemu-devel] [PATCH v3 7/7] RTC:Allow to migrate from old version
From: |
Zhang, Yang Z |
Subject: |
[Qemu-devel] [PATCH v3 7/7] RTC:Allow to migrate from old version |
Date: |
Fri, 2 Mar 2012 07:00:35 +0000 |
The new logic is compatible with old. So it should not block to migrate
from old version. But new version cannot migrate to old.
Signed-off-by: Yang Zhang <address@hidden>
---
hw/mc146818rtc.c | 48 ++++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 44 insertions(+), 4 deletions(-)
diff --git a/hw/mc146818rtc.c b/hw/mc146818rtc.c
index 384bdc1..02f7ea0 100644
--- a/hw/mc146818rtc.c
+++ b/hw/mc146818rtc.c
@@ -635,11 +635,51 @@ static int rtc_post_load(void *opaque, int version_id)
return 0;
}
+static int rtc_load_old(QEMUFile *f, void *opaque, int version_id)
+{
+ RTCState *s = opaque;
+
+ if (version_id > 2) {
+ return -EINVAL;
+ }
+
+ qemu_get_buffer(f, s->cmos_data, sizeof(s->cmos_data));
+ /* dummy load for compatibility */
+ qemu_get_byte(f); /* cmos_index */
+ qemu_get_be32(f); /* tm_sec */
+ qemu_get_be32(f); /* tm_min */
+ qemu_get_be32(f); /* tm_hour */
+ qemu_get_be32(f); /* tm_wday */
+ qemu_get_be32(f); /* tm_mday */
+ qemu_get_be32(f); /* tm_mon */
+ qemu_get_be32(f); /* tm_year */
+ qemu_get_be64(f); /* periodic_timer */
+ qemu_get_be64(f); /* next_periodic_time */
+ qemu_get_be64(f); /* next_second_time */
+ qemu_get_be64(f); /* second_timer */
+ qemu_get_be64(f); /* second_timer2 */
+ qemu_get_be32(f); /* irq_coalesced */
+ qemu_get_be32(f); /* period */
+
+
+ rtc_set_date_from_host(&s->dev);
+ periodic_timer_update(s, qemu_get_clock_ns(rtc_clock));
+ check_update_timer(s);
+
+#ifdef TARGET_I386
+ if (s->lost_tick_policy == LOST_TICK_SLEW) {
+ rtc_coalesced_timer_update(s);
+ }
+#endif
+ return 0;
+}
+
static const VMStateDescription vmstate_rtc = {
.name = "mc146818rtc",
- .version_id = 2,
- .minimum_version_id = 1,
- .minimum_version_id_old = 1,
+ .version_id = 3,
+ .minimum_version_id = 3,
+ .minimum_version_id_old = 2,
+ .load_state_old = rtc_load_old,
.post_load = rtc_post_load,
.fields = (VMStateField []) {
VMSTATE_BUFFER(cmos_data, RTCState),
@@ -777,7 +817,7 @@ static int rtc_initfn(ISADevice *dev)
memory_region_init_io(&s->io, &cmos_ops, s, "rtc", 2);
isa_register_ioport(dev, &s->io, base);
- qdev_set_legacy_instance_id(&dev->qdev, base, 2);
+ qdev_set_legacy_instance_id(&dev->qdev, base, 3);
qemu_register_reset(rtc_reset, s);
object_property_add(OBJECT(s), "date", "struct tm",
--
1.7.1
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