[PULL 48/54] gdbstub: replace exit calls with proper shutdown for softmmu

[Alistair Francis]

From: Clément Chigot <chigot@adacore.com>

This replaces the exit calls by shutdown requests, ensuring a proper
cleanup of Qemu. Features like net/vhost-vdpa.c are expecting
qemu_cleanup to be called to remove their last residuals.

Signed-off-by: Clément Chigot <chigot@adacore.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-ID: <20231003071427.188697-6-chigot@adacore.com>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
---
 include/gdbstub/syscalls.h | 9 +++++++++
 gdbstub/gdbstub.c          | 5 +++--
 gdbstub/system.c           | 6 ++++++
 gdbstub/user.c             | 6 ++++++
 4 files changed, 24 insertions(+), 2 deletions(-)

diff --git a/include/gdbstub/syscalls.h b/include/gdbstub/syscalls.h
index 243eaf8ce4..54ff7245a1 100644
--- a/include/gdbstub/syscalls.h
+++ b/include/gdbstub/syscalls.h
@@ -110,4 +110,13 @@ int use_gdb_syscalls(void);
  */
 void gdb_exit(int code);
 
+/**
+ * gdb_qemu_exit: ask qemu to exit
+ * @code: exit code reported
+ *
+ * This requests qemu to exit. This function is allowed to return as
+ * the exit request might be processed asynchronously by qemu backend.
+ */
+void gdb_qemu_exit(int code);
+
 #endif /* _SYSCALLS_H_ */
diff --git a/gdbstub/gdbstub.c b/gdbstub/gdbstub.c
index b1532118d1..1e96a71c0c 100644
--- a/gdbstub/gdbstub.c
+++ b/gdbstub/gdbstub.c
@@ -1324,7 +1324,7 @@ static void handle_v_kill(GArray *params, void *user_ctx)
     gdb_put_packet("OK");
     error_report("QEMU: Terminated via GDBstub");
     gdb_exit(0);
-    exit(0);
+    gdb_qemu_exit(0);
 }
 
 static const GdbCmdParseEntry gdb_v_commands_table[] = {
@@ -1843,7 +1843,8 @@ static int gdb_handle_packet(const char *line_buf)
         /* Kill the target */
         error_report("QEMU: Terminated via GDBstub");
         gdb_exit(0);
-        exit(0);
+        gdb_qemu_exit(0);
+        break;
     case 'D':
         {
             static const GdbCmdParseEntry detach_cmd_desc = {
diff --git a/gdbstub/system.c b/gdbstub/system.c
index 48976873d2..783ac140b9 100644
--- a/gdbstub/system.c
+++ b/gdbstub/system.c
@@ -435,6 +435,12 @@ void gdb_exit(int code)
     qemu_chr_fe_deinit(&gdbserver_system_state.chr, true);
 }
 
+void gdb_qemu_exit(int code)
+{
+    qemu_system_shutdown_request_with_code(SHUTDOWN_CAUSE_GUEST_SHUTDOWN,
+                                           code);
+}
+
 /*
  * Memory access
  */
diff --git a/gdbstub/user.c b/gdbstub/user.c
index 7ab6e5d975..dbe1d9b887 100644
--- a/gdbstub/user.c
+++ b/gdbstub/user.c
@@ -113,6 +113,12 @@ void gdb_exit(int code)
         gdb_put_packet(buf);
         gdbserver_state.allow_stop_reply = false;
     }
+
+}
+
+void gdb_qemu_exit(int code)
+{
+    exit(code);
 }
 
 int gdb_handlesig(CPUState *cpu, int sig)
-- 
2.41.0