hw/ppc: Add pnv_spi vmstate support

- Add support for needed PnvSpi structure variables

Reviewed-by: Michael Kowal <kowal@linux.ibm.com>
Reviewed-by: Aditya Gupta <adityag@linux.ibm.com>
Reviewed-by: Chalapathi V <chalapathi.v@linux.ibm.com>
Signed-off-by: Caleb Schlossin <calebs@linux.ibm.com>
Link: https://lore.kernel.org/qemu-devel/20260105160138.3242709-3-calebs@linux.ibm.com
Signed-off-by: Harsh Prateek Bora <harshpb@linux.ibm.com>

hw/ssi/pnv_spi.c

@@ -13,6 +13,7 @@
 #include "hw/ssi/pnv_spi.h"
 #include "hw/ssi/pnv_spi_regs.h"
 #include "hw/ssi/ssi.h"
+#include "migration/vmstate.h"
 #include <libfdt.h>
 #include "hw/core/irq.h"
 #include "trace.h"
@@ -1199,6 +1200,31 @@ static int pnv_spi_dt_xscom(PnvXScomInterface *dev, void *fdt,
     return 0;
 }
 
+static const VMStateDescription pnv_spi_vmstate = {
+    .name = TYPE_PNV_SPI,
+    .version_id = 1,
+    .fields = (const VMStateField[]) {
+        VMSTATE_UINT8(fail_count, PnvSpi),
+        VMSTATE_UINT8(transfer_len, PnvSpi),
+        VMSTATE_UINT8(responder_select, PnvSpi),
+        VMSTATE_BOOL(shift_n1_done, PnvSpi),
+        VMSTATE_UINT8(loop_counter_1, PnvSpi),
+        VMSTATE_UINT8(loop_counter_2, PnvSpi),
+        VMSTATE_UINT8(N1_bits, PnvSpi),
+        VMSTATE_UINT8(N2_bits, PnvSpi),
+        VMSTATE_UINT8(N1_bytes, PnvSpi),
+        VMSTATE_UINT8(N2_bytes, PnvSpi),
+        VMSTATE_UINT8(N1_tx, PnvSpi),
+        VMSTATE_UINT8(N2_tx, PnvSpi),
+        VMSTATE_UINT8(N1_rx, PnvSpi),
+        VMSTATE_UINT8(N2_rx, PnvSpi),
+        VMSTATE_UINT64_ARRAY(regs, PnvSpi, PNV_SPI_REGS),
+        VMSTATE_UINT8_ARRAY(seq_op, PnvSpi, PNV_SPI_REG_SIZE),
+        VMSTATE_UINT64(status, PnvSpi),
+        VMSTATE_END_OF_LIST(),
+    },
+};
+
 static void pnv_spi_class_init(ObjectClass *klass, const void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
@@ -1209,6 +1235,7 @@ static void pnv_spi_class_init(ObjectClass *klass, const void *data)
     dc->desc = "PowerNV SPI";
     dc->realize = pnv_spi_realize;
     device_class_set_legacy_reset(dc, do_reset);
+    dc->vmsd = &pnv_spi_vmstate;
     device_class_set_props(dc, pnv_spi_properties);
 }