[Qemu-devel] [PATCH] Save/load PC speaker internal state

[Pavel Dovgaluk]

Save PC speaker state to remove differences between system
states after saving the snapshot and after loading it again.
This patch is needed for deterministic replay of the execution.

Signed-off-by: Pavel Dovgalyuk<pavel.dovga...@gmail.com>
---
 hw/pcspk.c |   18 ++++++++++++++++++
 1 files changed, 18 insertions(+), 0 deletions(-)

diff --git a/hw/pcspk.c b/hw/pcspk.c
index e430324..3fb3dd1 100644
--- a/hw/pcspk.c
+++ b/hw/pcspk.c
@@ -159,10 +159,28 @@ static const MemoryRegionOps pcspk_io_ops = {
     },
 };
 
+static const VMStateDescription vmstate_spk = {
+    .name = "pcspk",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .minimum_version_id_old = 1,
+    .fields      = (VMStateField[]) {
+        VMSTATE_UINT8_ARRAY(sample_buf, PCSpkState, PCSPK_BUF_LEN),
+        VMSTATE_UINT32(pit_count, PCSpkState),
+        VMSTATE_UINT32(samples, PCSpkState),
+        VMSTATE_UINT32(play_pos, PCSpkState),
+        VMSTATE_INT32(data_on, PCSpkState),
+        VMSTATE_INT32(dummy_refresh_clock, PCSpkState),
+        VMSTATE_END_OF_LIST()
+    }
+};
+
 static int pcspk_initfn(ISADevice *dev)
 {
     PCSpkState *s = DO_UPCAST(PCSpkState, dev, dev);
 
+    vmstate_register(NULL, 0, &vmstate_spk, s);
+
     memory_region_init_io(&s->ioport, &pcspk_io_ops, s, "elcr", 1);
     isa_register_ioport(dev, &s->ioport, s->iobase);