Re: [PATCH 05/23] xen/arm: Add capabilities to dom0less

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Fri, 7 Mar 2025, Julien Grall wrote:
> > What exactly do you mean by imposing with respect to the iommu?  Require
> > one, or mirror the dom0 code and set it for the hwdom?
> > 
> >      if ( iommu_enabled )
> >          dom0_cfg.flags |= XEN_DOMCTL_CDF_iommu;
> 
> I mean requires one. Without it, you would need to set directmap and I don't
> think this should be allowed (at least for now) for the HW domain.

I think the directmap should be optional for the hardware domain. In
practice, we already have not direct-mapped dom0 today when the user
enables cache coloring.