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authorLongpeng <longpeng2@huawei.com>2022-03-15 06:25:51 +0300
committerMichael S. Tsirkin <mst@redhat.com>2022-03-28 23:53:00 +0300
commita61280ddddaa45f95b60dd54c05f8e0e5b6810b7 (patch)
treef31e76d3b574d121c152341b47e065d2b4f4d1ab /drivers/vhost
parentf1781bedea8cae7f26aa0f20a00017ab746d4d4c (diff)
downloadlinux-a61280ddddaa45f95b60dd54c05f8e0e5b6810b7.tar.xz
vdpa: support exposing the config size to userspace
- GET_CONFIG_SIZE: return the size of the virtio config space. The size contains the fields which are conditional on feature bits. Acked-by: Jason Wang <jasowang@redhat.com> Signed-off-by: Longpeng <longpeng2@huawei.com> Link: https://lore.kernel.org/r/20220315032553.455-2-longpeng2@huawei.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Diffstat (limited to 'drivers/vhost')
-rw-r--r--drivers/vhost/vdpa.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 05f5fd2af58f..04375722c0e5 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -358,6 +358,20 @@ 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)
{
@@ -495,6 +509,9 @@ 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)