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SubjectRe: [PATCH v2 1/2] vdpa: support exposing the config size to userspace
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在 2022/3/10 下午3:20, Longpeng(Mike) 写道:
> From: Longpeng <longpeng2@huawei.com>
>
> - GET_CONFIG_SIZE: return the size of the virtio config space.
>
> The size contains the fields which are conditional on feature
> bits.
>
> Signed-off-by: Longpeng <longpeng2@huawei.com>


Acked-by: Jason Wang <jasowang@redhat.com>


> ---
> drivers/vhost/vdpa.c | 17 +++++++++++++++++
> include/linux/vdpa.h | 3 ++-
> include/uapi/linux/vhost.h | 4 ++++
> 3 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index ec5249e..605c7ae 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -355,6 +355,20 @@ static long vhost_vdpa_get_iova_range(struct vhost_vdpa *v, u32 __user *argp)
> return 0;
> }
>
> +static long vhost_vdpa_get_config_size(struct vhost_vdpa *v, u32 __user *argp)
> +{
> + struct vdpa_device *vdpa = v->vdpa;
> + const struct vdpa_config_ops *ops = vdpa->config;
> + u32 size;
> +
> + size = ops->get_config_size(vdpa);
> +
> + if (copy_to_user(argp, &size, sizeof(size)))
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> static long vhost_vdpa_vring_ioctl(struct vhost_vdpa *v, unsigned int cmd,
> void __user *argp)
> {
> @@ -492,6 +506,9 @@ static long vhost_vdpa_unlocked_ioctl(struct file *filep,
> case VHOST_VDPA_GET_IOVA_RANGE:
> r = vhost_vdpa_get_iova_range(v, argp);
> break;
> + case VHOST_VDPA_GET_CONFIG_SIZE:
> + r = vhost_vdpa_get_config_size(v, argp);
> + break;
> default:
> r = vhost_dev_ioctl(&v->vdev, cmd, argp);
> if (r == -ENOIOCTLCMD)
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 721089b..a526919 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -207,7 +207,8 @@ struct vdpa_map_file {
> * @reset: Reset device
> * @vdev: vdpa device
> * Returns integer: success (0) or error (< 0)
> - * @get_config_size: Get the size of the configuration space
> + * @get_config_size: Get the size of the configuration space includes
> + * fields that are conditional on feature bits.
> * @vdev: vdpa device
> * Returns size_t: configuration size
> * @get_config: Read from device specific configuration space
> diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h
> index c998860..bc74e95 100644
> --- a/include/uapi/linux/vhost.h
> +++ b/include/uapi/linux/vhost.h
> @@ -150,4 +150,8 @@
> /* Get the valid iova range */
> #define VHOST_VDPA_GET_IOVA_RANGE _IOR(VHOST_VIRTIO, 0x78, \
> struct vhost_vdpa_iova_range)
> +
> +/* Get the config size */
> +#define VHOST_VDPA_GET_CONFIG_SIZE _IOR(VHOST_VIRTIO, 0x79, __u32)
> +
> #endif

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