[PULL 20/49] hw/net/xilinx_ethlite: Map RESERVED I/O as unimplemented

[Philippe Mathieu-Daudé]

In order to track access to reserved I/O space, use yet
another UnimplementedDevice covering the whole device
memory range. Mapped with lower priority (-1).

The memory flat view becomes:

  (qemu) info mtree -f
  FlatView #0
   Root memory region: system
    0000000081000000-00000000810007e3 (prio 0, ram): ethlite.tx[0]buf
    00000000810007e4-00000000810007f3 (prio 0, i/o): ethlite.mdio
    00000000810007f4-00000000810007ff (prio 0, i/o): ethlite.tx[0]io
    0000000081000800-0000000081000fe3 (prio 0, ram): ethlite.tx[1]buf
    0000000081000fe4-0000000081000ff3 (prio -1, i/o): ethlite.reserved 
@0000000000000fe4
    0000000081000ff4-0000000081000fff (prio 0, i/o): ethlite.tx[1]io
    0000000081001000-00000000810017e3 (prio 0, ram): ethlite.rx[0]buf
    00000000810017e4-00000000810017fb (prio -1, i/o): ethlite.reserved 
@00000000000017e4
    00000000810017fc-00000000810017ff (prio 0, i/o): ethlite.rx[0]io
    0000000081001800-0000000081001fe3 (prio 0, ram): ethlite.rx[1]buf
    0000000081001fe4-0000000081001ffb (prio -1, i/o): ethlite.reserved 
@0000000000001fe4
    0000000081001ffc-0000000081001fff (prio 0, i/o): ethlite.rx[1]io

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20241114210010.34502-20-philmd@linaro.org>
---
 hw/net/xilinx_ethlite.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/hw/net/xilinx_ethlite.c b/hw/net/xilinx_ethlite.c
index a7f6d1b368c..14bf2b2e17a 100644
--- a/hw/net/xilinx_ethlite.c
+++ b/hw/net/xilinx_ethlite.c
@@ -94,6 +94,7 @@ struct XlnxXpsEthLite
     uint32_t c_rx_pingpong;
     unsigned int port_index; /* dual port RAM index */
 
+    UnimplementedDeviceState rsvd;
     UnimplementedDeviceState mdio;
     XlnxXpsEthLitePort port[2];
 };
@@ -303,6 +304,16 @@ static void xilinx_ethlite_realize(DeviceState *dev, Error 
**errp)
     memory_region_init(&s->container, OBJECT(dev),
                        "xlnx.xps-ethernetlite", 0x2000);
 
+    object_initialize_child(OBJECT(dev), "ethlite.reserved", &s->rsvd,
+                            TYPE_UNIMPLEMENTED_DEVICE);
+    qdev_prop_set_string(DEVICE(&s->rsvd), "name", "ethlite.reserved");
+    qdev_prop_set_uint64(DEVICE(&s->rsvd), "size",
+                         memory_region_size(&s->container));
+    sysbus_realize(SYS_BUS_DEVICE(&s->rsvd), &error_fatal);
+    memory_region_add_subregion_overlap(&s->container, 0,
+                           sysbus_mmio_get_region(SYS_BUS_DEVICE(&s->rsvd), 0),
+                           -1);
+
     object_initialize_child(OBJECT(dev), "ethlite.mdio", &s->mdio,
                             TYPE_UNIMPLEMENTED_DEVICE);
     qdev_prop_set_string(DEVICE(&s->mdio), "name", "ethlite.mdio");
-- 
2.47.1