[PATCH v5 2/6] vdpa: Allocate SVQ unconditionally

["Eugenio Pérez" <eperezma@redhat.com>]

SVQ may run or not in a device depending on runtime conditions (for
example, if the device can move CVQ to its own group or not).

Allocate the resources unconditionally, and decide later if to use them
or not.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
---
 hw/virtio/vhost-vdpa.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/hw/virtio/vhost-vdpa.c b/hw/virtio/vhost-vdpa.c
index 7f0ff4df5b..d966966131 100644
--- a/hw/virtio/vhost-vdpa.c
+++ b/hw/virtio/vhost-vdpa.c
@@ -410,6 +410,21 @@ static int vhost_vdpa_init_svq(struct vhost_dev *hdev, struct vhost_vdpa *v,
     int r;
     bool ok;
 
+    shadow_vqs = g_ptr_array_new_full(hdev->nvqs, vhost_svq_free);
+    for (unsigned n = 0; n < hdev->nvqs; ++n) {
+        g_autoptr(VhostShadowVirtqueue) svq;
+
+        svq = vhost_svq_new(v->iova_tree, v->shadow_vq_ops,
+                            v->shadow_vq_ops_opaque);
+        if (unlikely(!svq)) {
+            error_setg(errp, "Cannot create svq %u", n);
+            return -1;
+        }
+        g_ptr_array_add(shadow_vqs, g_steal_pointer(&svq));
+    }
+
+    v->shadow_vqs = g_steal_pointer(&shadow_vqs);
+
     if (!v->shadow_vqs_enabled) {
         return 0;
     }
@@ -426,20 +441,6 @@ static int vhost_vdpa_init_svq(struct vhost_dev *hdev, struct vhost_vdpa *v,
         return -1;
     }
 
-    shadow_vqs = g_ptr_array_new_full(hdev->nvqs, vhost_svq_free);
-    for (unsigned n = 0; n < hdev->nvqs; ++n) {
-        g_autoptr(VhostShadowVirtqueue) svq;
-
-        svq = vhost_svq_new(v->iova_tree, v->shadow_vq_ops,
-                            v->shadow_vq_ops_opaque);
-        if (unlikely(!svq)) {
-            error_setg(errp, "Cannot create svq %u", n);
-            return -1;
-        }
-        g_ptr_array_add(shadow_vqs, g_steal_pointer(&svq));
-    }
-
-    v->shadow_vqs = g_steal_pointer(&shadow_vqs);
     return 0;
 }
 
@@ -580,10 +581,6 @@ static void vhost_vdpa_svq_cleanup(struct vhost_dev *dev)
     struct vhost_vdpa *v = dev->opaque;
     size_t idx;
 
-    if (!v->shadow_vqs) {
-        return;
-    }
-
     for (idx = 0; idx < v->shadow_vqs->len; ++idx) {
         vhost_svq_stop(g_ptr_array_index(v->shadow_vqs, idx));
     }
-- 
2.31.1