Re: [Xen-devel] [PATCH for-4.13] xen/arm: boot with device trees with "mmu-masters" and "iommus"

[Jürgen Groß <jgross@xxxxxxxx>]

On 02.10.19 19:02, Julien Grall wrote:
> +Juergen
>
> Hi,
>
> On 10/1/19 4:16 PM, Oleksandr wrote:
> > On 30.09.19 23:56, Stefano Stabellini wrote:
> >
> > Hi Stefano
> >
> > > Some Device Trees may expose both legacy SMMU and generic IOMMU bindings
> > > together. However, the SMMU driver in Xen is only supporting the legacy
> > > SMMU bindings, leading to fatal initialization errors at boot time.
> > >
> > > This patch fixes the booting problem by adding a check to
> > > iommu_add_dt_device: if the Xen driver doesn't support the new generic
> > > bindings, and the device is behind an IOMMU, do not return error. The
> > > following iommu_assign_dt_device should succeed.
> > >
> > > This check will become superfluous, hence removable, once the Xen SMMU
> > > driver gets support for the generic IOMMU bindings.
> > >
> > > Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxx>
Release-acked-by: Juergen Gross <jgross@xxxxxxxx>


Juergen

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