Re: [PATCH v13 22/42] virtio_ring: packed: introduce virtqueue_reinit_packed()
From: Jason Wang <jasowang@redhat.com>
Date: 2022-07-27 04:35:36
Also in:
bpf, kvm, linux-remoteproc, linux-s390, linux-um, platform-driver-x86, virtualization
在 2022/7/26 15:22, Xuan Zhuo 写道:
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>
quoted hunk ↗ jump to hunk
--- 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 00b18cf3b4d9..7d4c444b5a9d 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c@@ -1957,6 +1957,27 @@ static void virtqueue_vring_attach_packed(struct vring_virtqueue *vq, vq->packed = *vring_packed; } +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->packed, !!vq->vq.callback); +} + static struct virtqueue *vring_create_virtqueue_packed( unsigned int index, unsigned int num,