diff options
| author | Xie Yongji <xieyongji@bytedance.com> | 2022-08-03 06:55:23 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2022-08-11 10:26:08 +0200 |
| commit | ad146355bfad627bd0717ece73997c6c93b1b82e (patch) | |
| tree | c0d44a43e357090a66bc7de0c724b75944ee1ad4 /drivers/vdpa/vdpa_user | |
| parent | vduse: Support registering userspace memory for IOVA regions (diff) | |
| download | linux-ad146355bfad627bd0717ece73997c6c93b1b82e.tar.xz linux-ad146355bfad627bd0717ece73997c6c93b1b82e.zip | |
vduse: Support querying information of IOVA regions
This introduces a new ioctl: VDUSE_IOTLB_GET_INFO to
support querying some information of IOVA regions.
Now it can be used to query whether the IOVA region
supports userspace memory registration.
Signed-off-by: Xie Yongji <xieyongji@bytedance.com>
Message-Id: <20220803045523.23851-6-xieyongji@bytedance.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Diffstat (limited to 'drivers/vdpa/vdpa_user')
| -rw-r--r-- | drivers/vdpa/vdpa_user/vduse_dev.c | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c index eedff0a3885a..41c0b29739f1 100644 --- a/drivers/vdpa/vdpa_user/vduse_dev.c +++ b/drivers/vdpa/vdpa_user/vduse_dev.c @@ -1228,6 +1228,45 @@ static long vduse_dev_ioctl(struct file *file, unsigned int cmd, umem.size); break; } + case VDUSE_IOTLB_GET_INFO: { + struct vduse_iova_info info; + struct vhost_iotlb_map *map; + struct vduse_iova_domain *domain = dev->domain; + + ret = -EFAULT; + if (copy_from_user(&info, argp, sizeof(info))) + break; + + ret = -EINVAL; + if (info.start > info.last) + break; + + if (!is_mem_zero((const char *)info.reserved, + sizeof(info.reserved))) + break; + + spin_lock(&domain->iotlb_lock); + map = vhost_iotlb_itree_first(domain->iotlb, + info.start, info.last); + if (map) { + info.start = map->start; + info.last = map->last; + info.capability = 0; + if (domain->bounce_map && map->start == 0 && + map->last == domain->bounce_size - 1) + info.capability |= VDUSE_IOVA_CAP_UMEM; + } + spin_unlock(&domain->iotlb_lock); + if (!map) + break; + + ret = -EFAULT; + if (copy_to_user(argp, &info, sizeof(info))) + break; + + ret = 0; + break; + } default: ret = -ENOIOCTLCMD; break; |