[PATCH v11 20/40] virtio_ring: packed: introduce virtqueue_reinit_packed()
From: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Date: 2022-06-29 06:59:02
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> --- drivers/virtio/virtio_ring.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c
index 2f58266539eb..650f701a5480 100644
--- a/drivers/virtio/virtio_ring.c
+++ b/drivers/virtio/virtio_ring.c@@ -1960,6 +1960,27 @@ static void virtqueue_vring_init_packed(struct vring_virtqueue *vq) } } +static void virtqueue_reinit_packed(struct vring_virtqueue *vq) +{ + int size, i; + + memset(vq->packed.vring.device, 0, vq->packed.event_size_in_bytes); + memset(vq->packed.vring.driver, 0, vq->packed.event_size_in_bytes); + memset(vq->packed.vring.desc, 0, vq->packed.ring_size_in_bytes); + + size = sizeof(struct vring_desc_state_packed) * vq->packed.vring.num; + memset(vq->packed.desc_state, 0, size); + + size = sizeof(struct vring_desc_extra) * vq->packed.vring.num; + memset(vq->packed.desc_extra, 0, size); + + for (i = 0; i < vq->packed.vring.num - 1; i++) + vq->packed.desc_extra[i].next = i + 1; + + virtqueue_init(vq, vq->packed.vring.num); + virtqueue_vring_init_packed(vq); +} + static struct virtqueue *vring_create_virtqueue_packed( unsigned int index, unsigned int num,
--
2.31.0