tcg: synchronize exit_request and tcg_current_cpu accesses

Synchronize the remaining pair of accesses in cpu_signal.  These should
be necessary on Windows as well, at least in theory.  Probably
SuspendProcess and ResumeProcess introduce some implicit memory
barrier.

Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/cpu-exec.c b/cpu-exec.c
index e24c640..ef9d745 100644
--- a/cpu-exec.c
+++ b/cpu-exec.c
@@ -372,7 +372,7 @@ int cpu_exec(CPUState *cpu)
     atomic_mb_set(&tcg_current_cpu, cpu);
     rcu_read_lock();
 
-    if (unlikely(exit_request)) {
+    if (unlikely(atomic_mb_read(&exit_request))) {
         cpu->exit_request = 1;
     }