unlock iothread mutex before running kvm ioctl

Without this, kvm will hold the mutex while it issues its run ioctl,
and never be able to step out of it, causing a deadlock.

Patchworks-ID: 35359
Signed-off-by: Glauber Costa <glommer@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

1 files changed, 4 insertions, 4 deletions

diff --git a/vl.c b/vl.c
index 374f85be33..afe01af9d7 100644
--- a/vl.c
+++ b/vl.c
@@ -3560,8 +3560,8 @@ void qemu_notify_event(void)
     }
 }
 
-#define qemu_mutex_lock_iothread() do { } while (0)
-#define qemu_mutex_unlock_iothread() do { } while (0)
+void qemu_mutex_lock_iothread(void) {}
+void qemu_mutex_unlock_iothread(void) {}
 
 void vm_stop(int reason)
 {
@@ -3760,7 +3760,7 @@ static void qemu_signal_lock(unsigned int msecs)
     qemu_mutex_unlock(&qemu_fair_mutex);
 }
 
-static void qemu_mutex_lock_iothread(void)
+void qemu_mutex_lock_iothread(void)
 {
     if (kvm_enabled()) {
         qemu_mutex_lock(&qemu_fair_mutex);
@@ -3770,7 +3770,7 @@ static void qemu_mutex_lock_iothread(void)
         qemu_signal_lock(100);
 }
 
-static void qemu_mutex_unlock_iothread(void)
+void qemu_mutex_unlock_iothread(void)
 {
     qemu_mutex_unlock(&qemu_global_mutex);
 }