On Thu, 11 Jun 2020 17:27:27 -0700 Jacob Pan <jacob.jun....@linux.intel.com> wrote:
> > > > But then I thought it even better if VFIO leaves the entire > > copy_from_user() to the layer consuming it. > > > OK. Sounds good, that was what Kevin suggested also. I just wasn't > sure how much VFIO wants to inspect, I thought VFIO layer wanted to > do a sanity check. > > Anyway, I will move copy_from_user to iommu uapi layer. Just one more point brought up by Yi when we discuss this offline. If we move copy_from_user to iommu uapi layer, then there will be multiple copy_from_user calls for the same data when a VFIO container has multiple domains, devices. For bind, it might be OK. But might be additional overhead for TLB flush request from the guest. Thoughts? Jacob _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
