Re: [Xen-devel] [PATCH v5 5/6] amd/iommu: assign iommu devices to Xen

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.11.18 at 17:01, <roger.pau@xxxxxxxxxx> wrote:
> AMD IOMMU devices are exposed on the PCI bus, and thus are assigned by
> default to the hardware domain. This can cause issues because the
> IOMMU devices themselves are not behind an IOMMU, so update_paging_mode will
> return an error if Xen tries to expand the page tables of a domain
> that has assigned devices not behind an IOMMU. update_paging_mode
> failing will cause the domain to be destroyed.
> 
> Fix this by hiding PCI IOMMU devices, so they are not assigned to the
> hardware domain.
> 
> Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>


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