[PATCH v14 22/42] virtio_ring: packed: introduce virtqueue_reinit_packed()
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-08-01 06:41:06
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 | 12 ++++++++++++ 1 file changed, 12 insertions(+)
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,
--
2.31.0