hw/ppc: set machine->fdt in xilinx_load_device_tree()

This will enable support for 'dumpdtb' QMP/HMP command for the
virtex_ml507 machine.

Setting machine->fdt requires a MachineState pointer to be used inside
xilinx_load_device_tree(). Let's change the function to receive this
pointer from the caller. kernel_cmdline' can be retrieved directly from
the 'machine' pointer. 'ramsize' wasn't being used so can be removed.

Cc: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <20220926173855.1159396-11-danielhb413@gmail.com>

hw/ppc/virtex_ml507.c

@@ -45,6 +45,8 @@
 #include "hw/qdev-properties.h"
 #include "ppc405.h"
 
+#include <libfdt.h>
+
 #define EPAPR_MAGIC    (0x45504150)
 #define FLASH_SIZE     (16 * MiB)
 
@@ -144,11 +146,10 @@ static void main_cpu_reset(void *opaque)
 }
 
 #define BINARY_DEVICE_TREE_FILE "virtex-ml507.dtb"
-static int xilinx_load_device_tree(hwaddr addr,
-                                      uint32_t ramsize,
-                                      hwaddr initrd_base,
-                                      hwaddr initrd_size,
-                                      const char *kernel_cmdline)
+static int xilinx_load_device_tree(MachineState *machine,
+                                   hwaddr addr,
+                                   hwaddr initrd_base,
+                                   hwaddr initrd_size)
 {
     char *path;
     int fdt_size;
@@ -190,18 +191,21 @@ static int xilinx_load_device_tree(hwaddr addr,
         error_report("couldn't set /chosen/linux,initrd-end");
     }
 
-    r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs", kernel_cmdline);
+    r = qemu_fdt_setprop_string(fdt, "/chosen", "bootargs",
+                                machine->kernel_cmdline);
     if (r < 0)
         fprintf(stderr, "couldn't set /chosen/bootargs\n");
     cpu_physical_memory_write(addr, fdt, fdt_size);
-    g_free(fdt);
+
+    /* Set machine->fdt for 'dumpdtb' QMP/HMP command */
+    machine->fdt = fdt;
+
     return fdt_size;
 }
 
 static void virtex_init(MachineState *machine)
 {
     const char *kernel_filename = machine->kernel_filename;
-    const char *kernel_cmdline = machine->kernel_cmdline;
     hwaddr initrd_base = 0;
     int initrd_size = 0;
     MemoryRegion *address_space_mem = get_system_memory();
@@ -294,9 +298,8 @@ static void virtex_init(MachineState *machine)
         boot_info.fdt = high + (8192 * 2);
         boot_info.fdt &= ~8191;
 
-        xilinx_load_device_tree(boot_info.fdt, machine->ram_size,
-                                initrd_base, initrd_size,
-                                kernel_cmdline);
+        xilinx_load_device_tree(machine, boot_info.fdt,
+                                initrd_base, initrd_size);
     }
     env->load_info = &boot_info;
 }