virtio: introduce qemu_get/put_virtqueue_element

Move allocation to virtio functions also when loading/saving a
VirtQueueElement.  This will also let the load/save functions
keep backwards compatibility when the VirtQueueElement layout
is changed.

Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

1 files changed, 13 insertions, 0 deletions

diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c
index 229a092..28fa7fe 100644
--- a/hw/virtio/virtio.c
+++ b/hw/virtio/virtio.c
@@ -576,6 +576,19 @@ void *virtqueue_pop(VirtQueue *vq, size_t sz)
     return elem;
 }
 
+void *qemu_get_virtqueue_element(QEMUFile *f, size_t sz)
+{
+    VirtQueueElement *elem = g_malloc(sz);
+    qemu_get_buffer(f, (uint8_t *)elem, sizeof(VirtQueueElement));
+    virtqueue_map(elem);
+    return elem;
+}
+
+void qemu_put_virtqueue_element(QEMUFile *f, VirtQueueElement *elem)
+{
+    qemu_put_buffer(f, (uint8_t *)elem, sizeof(VirtQueueElement));
+}
+
 /* virtio device */
 static void virtio_notify_vector(VirtIODevice *vdev, uint16_t vector)
 {