[RFC v2 3/4] vduse: update the vq_info in ioctl
From: Cindy Lu <hidden>
Date: 2023-09-12 03:24:54
Also in:
kvm, lkml, stable
Subsystem:
the rest, virtio core · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang
In VDUSE_VQ_GET_INFO, the driver will sync the last_avail_idx with reconnect info, After mapping the reconnect pages to userspace The userspace App will update the reconnect_time in struct vhost_reconnect_vring, If this is not 0 then it means this vq is reconnected and will update the last_avail_idx Signed-off-by: Cindy Lu <redacted> --- drivers/vdpa/vdpa_user/vduse_dev.c | 13 +++++++++++++ include/uapi/linux/vduse.h | 6 ++++++ 2 files changed, 19 insertions(+)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 2c69f4004a6e..680b23dbdde2 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c@@ -1221,6 +1221,8 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd, struct vduse_vq_info vq_info; struct vduse_virtqueue *vq; u32 index; + struct vdpa_reconnect_info *area; + struct vhost_reconnect_vring *vq_reconnect; ret = -EFAULT; if (copy_from_user(&vq_info, argp, sizeof(vq_info)))
@@ -1252,6 +1254,17 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd, vq_info.ready = vq->ready; + area = &vq->reconnect_info; + + vq_reconnect = (struct vhost_reconnect_vring *)area->vaddr; + /*check if the vq is reconnect, if yes then update the last_avail_idx*/ + if ((vq_reconnect->last_avail_idx != + vq_info.split.avail_index) && + (vq_reconnect->reconnect_time != 0)) { + vq_info.split.avail_index = + vq_reconnect->last_avail_idx; + } + ret = -EFAULT; if (copy_to_user(argp, &vq_info, sizeof(vq_info))) break;
diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h
index 11bd48c72c6c..d585425803fd 100644
--- a/include/uapi/linux/vduse.h
+++ b/include/uapi/linux/vduse.h@@ -350,4 +350,10 @@ struct vduse_dev_response { }; }; +struct vhost_reconnect_vring { + __u16 reconnect_time; + __u16 last_avail_idx; + _Bool avail_wrap_counter; +}; + #endif /* _UAPI_VDUSE_H_ */
--
2.34.3