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| author | Xuan Zhuo <xuanzhuo@linux.alibaba.com> | 2022-08-01 08:38:42 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-08-11 10:06:40 +0200 |
| commit | 56775e141b18790f70e05537f3a1417565e766ac (patch) | |
| tree | 877ae9e64754b6e8ab7ec225ae43c3606ff53d7c /drivers/virtio | |
| parent | virtio_ring: packed: extract the logic of attach vring (diff) | |
| download | linux-56775e141b18790f70e05537f3a1417565e766ac.tar.xz linux-56775e141b18790f70e05537f3a1417565e766ac.zip | |
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>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_ring.c | 12 |
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, |