On Fri, Feb 21, 2025 at 11:42:06AM +0000, Jean-Philippe Brucker wrote: > > There is no requirement that an iommu driver implement identity, this > > is all an optimization. If it doesn't work in alot of cases can we > > just remove it? It would simplfy a lot.. > > No objection. Identity domains are useful if the use-case of virtio-iommu > is assigning devices to guest userspace, in which case you'd want to > bypass the IOMMU for the devices that are still owned by the kernel. But > VMMs have at least two alternatives to identity-mapping (BYPASS feature > and tailored topology). Since Robin pointed out a few other drivers that would like to use the domain_op lets leave it as is. Thanks, Jason
