[PATCH v13 14/42] virtio_ring: split: introduce virtqueue_reinit_split()
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-07-26 07:23:28
Also in:
bpf, kvm, linux-remoteproc, linux-s390, linux-um, platform-driver-x86, virtualization
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
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> --- drivers/virtio/virtio_ring.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 2067818f7047..aa5dda96824e 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c@@ -967,6 +967,25 @@ static void virtqueue_vring_init_split(struct vring_virtqueue_split *vring_split } } +static void virtqueue_reinit_split(struct vring_virtqueue *vq) +{ + int size, i; + + memset(vq->split.vring.desc, 0, vq->split.queue_size_in_bytes); + + size = sizeof(struct vring_desc_state_split) * vq->split.vring.num; + memset(vq->split.desc_state, 0, size); + + size = sizeof(struct vring_desc_extra) * vq->split.vring.num; + memset(vq->split.desc_extra, 0, size); + + for (i = 0; i < vq->split.vring.num - 1; i++) + vq->split.desc_extra[i].next = i + 1; + + virtqueue_init(vq, vq->split.vring.num); + virtqueue_vring_init_split(&vq->split, vq); +} + static void virtqueue_vring_attach_split(struct vring_virtqueue *vq, struct vring_virtqueue_split *vring_split) {
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2.31.0