vhost: move acked_features to VQs
Refactor code to make sure features are only accessed
under VQ mutex. This makes everything simpler, no need
for RCU here anymore.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c
index c2a54fb..6fa3bf8 100644
--- a/drivers/vhost/test.c
+++ b/drivers/vhost/test.c
@@ -241,15 +241,18 @@
static int vhost_test_set_features(struct vhost_test *n, u64 features)
{
+ struct vhost_virtqueue *vq;
+
mutex_lock(&n->dev.mutex);
if ((features & (1 << VHOST_F_LOG_ALL)) &&
!vhost_log_access_ok(&n->dev)) {
mutex_unlock(&n->dev.mutex);
return -EFAULT;
}
- n->dev.acked_features = features;
- smp_wmb();
- vhost_test_flush(n);
+ vq = &n->vqs[VHOST_TEST_VQ];
+ mutex_lock(&vq->mutex);
+ vq->acked_features = features;
+ mutex_unlock(&vq->mutex);
mutex_unlock(&n->dev.mutex);
return 0;
}