vhost-user: simplify vhost_user_init/vhost_user_cleanup

Take a VhostUserState* that can be pre-allocated, and initialize it
with the associated chardev.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
Message-Id: <20190308140454.32437-4-marcandre.lureau@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

2 files changed, 14 insertions, 6 deletions

diff --git a/hw/virtio/vhost-stub.c b/hw/virtio/vhost-stub.c
index 049089b..c175148 100644
--- a/hw/virtio/vhost-stub.c
+++ b/hw/virtio/vhost-stub.c
@@ -7,9 +7,9 @@ bool vhost_has_free_slot(void)
     return true;
 }
 
-VhostUserState *vhost_user_init(void)
+bool vhost_user_init(VhostUserState *user, CharBackend *chr, Error **errp)
 {
-    return NULL;
+    return false;
 }
 
 void vhost_user_cleanup(VhostUserState *user)
diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c
index 0d6c64e..0164060 100644
--- a/hw/virtio/vhost-user.c
+++ b/hw/virtio/vhost-user.c
@@ -1750,17 +1750,24 @@ static bool vhost_user_mem_section_filter(struct vhost_dev *dev,
     return result;
 }
 
-VhostUserState *vhost_user_init(void)
+bool vhost_user_init(VhostUserState *user, CharBackend *chr, Error **errp)
 {
-    VhostUserState *user = g_new0(struct VhostUserState, 1);
-
-    return user;
+    if (user->chr) {
+        error_setg(errp, "Cannot initialize vhost-user state");
+        return false;
+    }
+    user->chr = chr;
+    return true;
 }
 
 void vhost_user_cleanup(VhostUserState *user)
 {
     int i;
 
+    if (!user->chr) {
+        return;
+    }
+
     for (i = 0; i < VIRTIO_QUEUE_MAX; i++) {
         if (user->notifier[i].addr) {
             object_unparent(OBJECT(&user->notifier[i].mr));
@@ -1768,6 +1775,7 @@ void vhost_user_cleanup(VhostUserState *user)
             user->notifier[i].addr = NULL;
         }
     }
+    user->chr = NULL;
 }
 
 const VhostOps user_ops = {