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| author | Longpeng <longpeng2@huawei.com> | 2022-03-15 11:25:51 +0800 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-03-28 16:53:00 -0400 |
| commit | a61280ddddaa45f95b60dd54c05f8e0e5b6810b7 (patch) | |
| tree | f31e76d3b574d121c152341b47e065d2b4f4d1ab /drivers/vhost | |
| parent | f1781bedea8cae7f26aa0f20a00017ab746d4d4c (diff) | |
| download | lwn-a61280ddddaa45f95b60dd54c05f8e0e5b6810b7.tar.gz lwn-a61280ddddaa45f95b60dd54c05f8e0e5b6810b7.zip | |
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.c | 17 |
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) |