device_tree: Add info message when dumping dtb to file

When dumping dtb to a file, qemu exits silently before starting the VM.

Add info message so user can easily track why the proccess exits.
Add error message if dtb dump failed.

Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
Message-Id: <20200319040326.391090-1-leonardo@linux.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/device_tree.c b/device_tree.c
index f8b46b3c73..bba6cc2164 100644
--- a/device_tree.c
+++ b/device_tree.c
@@ -530,7 +530,12 @@ void qemu_fdt_dumpdtb(void *fdt, int size)
 
     if (dumpdtb) {
         /* Dump the dtb to a file and quit */
-        exit(g_file_set_contents(dumpdtb, fdt, size, NULL) ? 0 : 1);
+        if (g_file_set_contents(dumpdtb, fdt, size, NULL)) {
+            info_report("dtb dumped to %s. Exiting.", dumpdtb);
+            exit(0);
+        }
+        error_report("%s: Failed dumping dtb to %s", __func__, dumpdtb);
+        exit(1);
     }
 }