cpus: Fix CPU unplug for MTTCG

Ensure that the unplugged CPU thread is destroyed and the waiting
thread is notified about it. This is needed for CPU unplug to work
correctly in MTTCG mode.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

diff --git a/cpus.c b/cpus.c
index 740b8dc3f808b320cce92c434af93f8bc315eb79..79f780b654a61f1ba769e2943f501a58dbb737de 100644 (file)
--- a/cpus.c
+++ b/cpus.c
@@ -1483,6 +1483,12 @@ static void *qemu_tcg_cpu_thread_fn(void *arg)
                 /* Ignore everything else? */
                 break;
             }
+        } else if (cpu->unplug) {
+            qemu_tcg_destroy_vcpu(cpu);
+            cpu->created = false;
+            qemu_cond_signal(&qemu_cpu_cond);
+            qemu_mutex_unlock_iothread();
+            return NULL;
         }
 
         atomic_mb_set(&cpu->exit_request, 0);