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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>
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