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authorXuan Zhuo <xuanzhuo@linux.alibaba.com>2022-08-01 14:38:42 +0800
committerMichael S. Tsirkin <mst@redhat.com>2022-08-11 04:06:40 -0400
commit56775e141b18790f70e05537f3a1417565e766ac (patch)
tree877ae9e64754b6e8ab7ec225ae43c3606ff53d7c
parent51d649f14aae0986c62cf798b262f99b49836e88 (diff)
virtio_ring: packed: introduce virtqueue_reinit_packed()
Introduce a function to initialize vq without allocating new ring, desc_state, desc_extra. Subsequent patches will call this function after reset vq to reinitialize vq. Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com> Acked-by: Jason Wang <jasowang@redhat.com> Message-Id: <20220801063902.129329-23-xuanzhuo@linux.alibaba.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
-rw-r--r--drivers/virtio/virtio_ring.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 93d2a950f536..db06fb0ddfd6 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c
@@ -1957,6 +1957,18 @@ static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq,
vq->free_head = 0;
}
+static void virtqueue_reinit_packed(struct vring_virtqueue *vq)
+{
+ memset(vq->packed.vring.device, 0, vq->packed.event_size_in_bytes);
+ memset(vq->packed.vring.driver, 0, vq->packed.event_size_in_bytes);
+
+ /* we need to reset the desc.flags. For more, see is_used_desc_packed() */
+ memset(vq->packed.vring.desc, 0, vq->packed.ring_size_in_bytes);
+
+ virtqueue_init(vq, vq->packed.vring.num);
+ virtqueue_vring_init_packed(&vq->packed, !!vq->vq.callback);
+}
+
static struct virtqueue *vring_create_virtqueue_packed(
unsigned int index,
unsigned int num,