commit 576a94d8bcaa1bb07a81d9ffd2cf76095a66ad9a
author Paolo Bonzini <pbonzini@redhat.com> Tue Mar 03 11:36:09 2015 +0100
committer Peter Maydell <peter.maydell@linaro.org> Tue Mar 03 13:21:53 2015 +0000
tree 879706ba4e400072ae763c7c520292a85d9fe4d7
parent 3180aadb1f00fa0f0b47bccbcae5b1d47dc5ff74

vl: take iothread lock very early

If the iothread lock isn't taken by the main thread, the RCU callbacks
might run concurrently with the main thread.  QEMU's not ready for that.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Tested-by: Gonglei <arei.gonglei@huawei.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

vl.c

diff --git a/vl.c b/vl.c
index 5d13d2f..801d487 100644
--- a/vl.c
+++ b/vl.c
@@ -2767,6 +2767,9 @@
     FILE *vmstate_dump_file = NULL;
     Error *main_loop_err = NULL;
 
+    qemu_init_cpu_loop();
+    qemu_mutex_lock_iothread();
+
     atexit(qemu_run_exit_notifiers);
     error_set_progname(argv[0]);
     qemu_init_exec_dir(argv[0]);
@@ -4102,9 +4105,6 @@
 
     os_set_line_buffering();
 
-    qemu_init_cpu_loop();
-    qemu_mutex_lock_iothread();
-
 #ifdef CONFIG_SPICE
     /* spice needs the timers to be initialized by this point */
     qemu_spice_init();