On 01/31/2012 11:41 AM, Jan Kiszka wrote:
In legacy mode, the HPET suppresses the RTC interrupt delivery via IRQ
8 but keeps track of the RTC output level and applies it when legacy
mode is turned off again. This value has to be preserved across save/
restore as it cannot be reconstructed otherwise.
Signed-off-by: Jan Kiszka<jan.kiszka@xxxxxxxxxxx>
---
hw/hpet.c | 26 ++++++++++++++++++++++++++
1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/hw/hpet.c b/hw/hpet.c
index aba9ea9..39b291f 100644
--- a/hw/hpet.c
+++ b/hw/hpet.c
@@ -240,6 +240,24 @@ static int hpet_post_load(void *opaque, int version_id)
return 0;
}
+static bool hpet_rtc_irq_level_needed(void *opaque)
+{
+ HPETState *s = opaque;
+
+ return s->rtc_irq_level != 0;
+}
+
+static const VMStateDescription vmstate_hpet_rtc_irq_level = {
+ .name = "hpet/rtc_irq_level",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .minimum_version_id_old = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT8(rtc_irq_level, HPETState),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
This won't work. We don't clear rtc_irq_level on reset so rtc_irq_level may be
high or low after reset. As such, we can't use a subsection here. We need to
bump the savevm state.
Regards,
Anthony Liguori
static const VMStateDescription vmstate_hpet_timer = {
.name = "hpet_timer",
.version_id = 1,
@@ -273,6 +291,14 @@ static const VMStateDescription vmstate_hpet = {
VMSTATE_STRUCT_VARRAY_UINT8(timer, HPETState, num_timers, 0,
vmstate_hpet_timer, HPETTimer),
VMSTATE_END_OF_LIST()
+ },
+ .subsections = (VMStateSubsection[]) {
+ {
+ .vmsd =&vmstate_hpet_rtc_irq_level,
+ .needed = hpet_rtc_irq_level_needed,
+ }, {
+ /* empty */
+ }
}
};
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