On Thu, Sep 25, 2014 at 03:32:33PM +0100, Joerg Roedel wrote: > On Wed, Sep 24, 2014 at 10:21:23AM +0100, Will Deacon wrote: > > Some IOMMUs, such as the ARM SMMU, support two stages of translation. > > The idea behind such a scheme is to allow a guest operating system to > > use the IOMMU for DMA mappings in the first stage of translation, with > > the hypervisor then installing mappings in the second stage to provide > > isolation of the DMA to the physical range assigned to that virtual > > machine. > > > > In order to allow IOMMU domains to be used for second-stage translation, > > this patch adds a new iommu_attr (IOMMU_ATTR_NESTING) for setting > > second-stage domains prior to device attach. The attribute can also be > > queried to see if a domain is actually making use of nesting. > > > > Cc: Joerg Roedel <j...@8bytes.org> > > Cc: Alex Williamson <alex.william...@redhat.com> > > Signed-off-by: Will Deacon <will.dea...@arm.com> > > Acked-by: Joerg Roedel <jroe...@suse.de>
Thanks, Joerg. Will _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
