1 files changed, 28 insertions, 2 deletions

diff --git a/hw/timer/hpet.c b/hw/timer/hpet.c
index 577371bc6d..d97436bc7b 100644
--- a/hw/timer/hpet.c
+++ b/hw/timer/hpet.c
@@ -70,6 +70,7 @@ typedef struct HPETState {
 
     MemoryRegion iomem;
     uint64_t hpet_offset;
+    bool hpet_offset_saved;
     qemu_irq irqs[HPET_NUM_IRQ_ROUTES];
     uint32_t flags;
     uint8_t rtc_irq_level;
@@ -221,7 +222,9 @@ static int hpet_pre_save(void *opaque)
     HPETState *s = opaque;
 
     /* save current counter value */
-    s->hpet_counter = hpet_get_ticks(s);
+    if (hpet_enabled(s)) {
+        s->hpet_counter = hpet_get_ticks(s);
+    }
 
     return 0;
 }
@@ -252,7 +255,10 @@ static int hpet_post_load(void *opaque, int version_id)
     HPETState *s = opaque;
 
     /* Recalculate the offset between the main counter and guest time */
-    s->hpet_offset = ticks_to_ns(s->hpet_counter) - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+    if (!s->hpet_offset_saved) {
+        s->hpet_offset = ticks_to_ns(s->hpet_counter)
+                        - qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
+    }
 
     /* Push number of timers into capability returned via HPET_ID */
     s->capability &= ~HPET_ID_NUM_TIM_MASK;
@@ -267,6 +273,13 @@ static int hpet_post_load(void *opaque, int version_id)
     return 0;
 }
 
+static bool hpet_offset_needed(void *opaque)
+{
+    HPETState *s = opaque;
+
+    return hpet_enabled(s) && s->hpet_offset_saved;
+}
+
 static bool hpet_rtc_irq_level_needed(void *opaque)
 {
     HPETState *s = opaque;
@@ -285,6 +298,17 @@ static const VMStateDescription vmstate_hpet_rtc_irq_level = {
     }
 };
 
+static const VMStateDescription vmstate_hpet_offset = {
+    .name = "hpet/offset",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = hpet_offset_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT64(hpet_offset, HPETState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static const VMStateDescription vmstate_hpet_timer = {
     .name = "hpet_timer",
     .version_id = 1,
@@ -320,6 +344,7 @@ static const VMStateDescription vmstate_hpet = {
     },
     .subsections = (const VMStateDescription*[]) {
         &vmstate_hpet_rtc_irq_level,
+        &vmstate_hpet_offset,
         NULL
     }
 };
@@ -762,6 +787,7 @@ static Property hpet_device_properties[] = {
     DEFINE_PROP_UINT8("timers", HPETState, num_timers, HPET_MIN_TIMERS),
     DEFINE_PROP_BIT("msi", HPETState, flags, HPET_MSI_SUPPORT, false),
     DEFINE_PROP_UINT32(HPET_INTCAP, HPETState, intcap, 0),
+    DEFINE_PROP_BOOL("hpet-offset-saved", HPETState, hpet_offset_saved, true),
     DEFINE_PROP_END_OF_LIST(),
 };