[PATCH for-8.2 3/4] hw/rtc/aspeed_rtc: Use 64-bit offset for holding time_t difference

[Peter Maydell <peter.maydell@linaro.org>]

In the aspeed_rtc device we store a difference between two time_t
values in an 'int'. This is not really correct when time_t could
be 64 bits. Enlarge the field to 'int64_t'.

This is a migration compatibility break for the aspeed boards.
While we are changing the vmstate, remove the accidental
duplicate of the offset field.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
I took "bump the migration version" as the simplest approach
here, because I don't think we care about migration compat
in this case. If we do I can write the alternate version of
the patch...
---
 include/hw/rtc/aspeed_rtc.h | 2 +-
 hw/rtc/aspeed_rtc.c         | 5 ++---
 2 files changed, 3 insertions(+), 4 deletions(-)

diff --git a/include/hw/rtc/aspeed_rtc.h b/include/hw/rtc/aspeed_rtc.h
index df61e46059e..596dfebb46c 100644
--- a/include/hw/rtc/aspeed_rtc.h
+++ b/include/hw/rtc/aspeed_rtc.h
@@ -18,7 +18,7 @@ struct AspeedRtcState {
     qemu_irq irq;
 
     uint32_t reg[0x18];
-    int offset;
+    int64_t offset;
 
 };
 
diff --git a/hw/rtc/aspeed_rtc.c b/hw/rtc/aspeed_rtc.c
index f6da7b666d6..fa861e2d494 100644
--- a/hw/rtc/aspeed_rtc.c
+++ b/hw/rtc/aspeed_rtc.c
@@ -136,11 +136,10 @@ static const MemoryRegionOps aspeed_rtc_ops = {
 
 static const VMStateDescription vmstate_aspeed_rtc = {
     .name = TYPE_ASPEED_RTC,
-    .version_id = 1,
+    .version_id = 2,
     .fields = (VMStateField[]) {
         VMSTATE_UINT32_ARRAY(reg, AspeedRtcState, 0x18),
-        VMSTATE_INT32(offset, AspeedRtcState),
-        VMSTATE_INT32(offset, AspeedRtcState),
+        VMSTATE_INT64(offset, AspeedRtcState),
         VMSTATE_END_OF_LIST()
     }
 };
-- 
2.34.1