system: propagate Error to gdbserver_start (and other device setups)

This started as a clean-up to properly pass a Error handler to the
gdbserver_start so we could do the right thing for command line and
HMP invocations.

Now that we have cleaned up foreach_device_config_or_exit() in earlier
patches we can further simplify by it by passing &error_fatal instead
of checking the return value. Having a return value is still useful
for HMP though so tweak the return to use a simple bool instead.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250116160306.1709518-11-alex.bennee@linaro.org>

1 files changed, 12 insertions, 10 deletions

diff --git a/gdbstub/system.c b/gdbstub/system.c
index 2d9fdff..8ce79fa 100644
--- a/gdbstub/system.c
+++ b/gdbstub/system.c
@@ -330,26 +330,27 @@ static void create_processes(GDBState *s)
     gdb_create_default_process(s);
 }
 
-int gdbserver_start(const char *device)
+bool gdbserver_start(const char *device, Error **errp)
 {
     Chardev *chr = NULL;
     Chardev *mon_chr;
     g_autoptr(GString) cs = g_string_new(device);
 
     if (!first_cpu) {
-        error_report("gdbstub: meaningless to attach gdb to a "
-                     "machine without any CPU.");
-        return -1;
+        error_setg(errp, "gdbstub: meaningless to attach gdb to a "
+                   "machine without any CPU.");
+        return false;
     }
 
     if (!gdb_supports_guest_debug()) {
-        error_report("gdbstub: current accelerator doesn't "
-                     "support guest debugging");
-        return -1;
+        error_setg(errp, "gdbstub: current accelerator doesn't "
+                   "support guest debugging");
+        return false;
     }
 
     if (cs->len == 0) {
-        return -1;
+        error_setg(errp, "gdbstub: missing connection string");
+        return false;
     }
 
     trace_gdbstub_op_start(cs->str);
@@ -374,7 +375,8 @@ int gdbserver_start(const char *device)
          */
         chr = qemu_chr_new_noreplay("gdb", cs->str, true, NULL);
         if (!chr) {
-            return -1;
+            error_setg(errp, "gdbstub: couldn't create chardev");
+            return false;
         }
     }
 
@@ -406,7 +408,7 @@ int gdbserver_start(const char *device)
     gdbserver_system_state.mon_chr = mon_chr;
     gdb_syscall_reset();
 
-    return 0;
+    return true;
 }
 
 static void register_types(void)