intel_iommu: enable remote IOTLB
This patch is based on Aviv Ben-David (<bd.aviv@gmail.com>)'s patch upstream: "IOMMU: enable intel_iommu map and unmap notifiers" https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg01453.html However I removed/fixed some content, and added my own codes. Instead of translate() every page for iotlb invalidations (which is slower), we walk the pages when needed and notify in a hook function. This patch enables vfio devices for VT-d emulation. And, since we already have vhost DMAR support via device-iotlb, a natural benefit that this patch brings is that vt-d enabled vhost can live even without ATS capability now. Though more tests are needed. Signed-off-by: NAviv Ben-David <bdaviv@cs.technion.ac.il> Reviewed-by: NJason Wang <jasowang@redhat.com> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> Reviewed-by: N\"Michael S. Tsirkin\" <mst@redhat.com> Signed-off-by: NPeter Xu <peterx@redhat.com> Message-Id: <1491562755-23867-10-git-send-email-peterx@redhat.com> Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Showing
想要评论请 注册 或 登录