[Qemu-devel] [PATCH] substitute structure dump with discrete dump in eeprom_save/load

[Andre Przywara <andre.przywara@amd.com>]

The EEPROM 93xx device used to dump a C structure to the migration stream.
This structure includes mixed 8 and 16bit variables and is thus subject to
compiler dependent padding. Replace this with discrete dumps of each member
(and add a padding byte to ensure compatibility, a version update is
included in the following patch).

Signed-off-by: Andre Przywara <andre.przywara@amd.com>

---
 hw/eeprom93xx.c |   30 ++++++++++++++++++++++++++++--
 1 files changed, 28 insertions(+), 2 deletions(-)

diff --git a/hw/eeprom93xx.c b/hw/eeprom93xx.c
index 896cffd..527fdf7 100644
--- a/hw/eeprom93xx.c
+++ b/hw/eeprom93xx.c
@@ -95,7 +95,19 @@ static void eeprom_save(QEMUFile *f, void *opaque)
     /* Save EEPROM data. */
     unsigned address;
     eeprom_t *eeprom = (eeprom_t *)opaque;
-    qemu_put_buffer(f, (uint8_t *)eeprom, sizeof(*eeprom) - 2);
+
+    qemu_put_byte(f, eeprom->tick);
+    qemu_put_byte(f, eeprom->address);
+    qemu_put_byte(f, eeprom->command);
+    qemu_put_byte(f, eeprom->writeable);
+
+    qemu_put_byte(f, eeprom->eecs);
+    qemu_put_byte(f, eeprom->eesk);
+    qemu_put_byte(f, eeprom->eedo);
+
+    qemu_put_byte(f, eeprom->addrbits);
+    qemu_put_byte(f, eeprom->size);
+    qemu_put_byte(f, 0);                  /* padding for compatiblity */
     qemu_put_be16(f, eeprom->data);
     for (address = 0; address < eeprom->size; address++) {
         qemu_put_be16(f, eeprom->contents[address]);
@@ -111,7 +123,20 @@ static int eeprom_load(QEMUFile *f, void *opaque, int version_id)
     if (version_id == eeprom_version) {
         unsigned address;
         uint8_t size = eeprom->size;
-        qemu_get_buffer(f, (uint8_t *)eeprom, sizeof(*eeprom) - 2);
+
+        eeprom->tick = qemu_get_byte(f);
+        eeprom->address = qemu_get_byte(f);
+        eeprom->command = qemu_get_byte(f);
+        eeprom->writeable = qemu_get_byte(f);
+
+        eeprom->eecs = qemu_get_byte(f);
+        eeprom->eesk = qemu_get_byte(f);
+        eeprom->eedo = qemu_get_byte(f);
+
+        eeprom->addrbits = qemu_get_byte(f);
+        eeprom->size = qemu_get_byte(f);
+        qemu_get_byte(f);                   /* skip padding byte */
+
         if (eeprom->size == size) {
             eeprom->data = qemu_get_be16(f);
             for (address = 0; address < eeprom->size; address++) {
-- 
1.5.2.2