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Re: [Xen-devel] [PATCH v6 1/2] amd/iommu: assign iommu devices to Xen

On Tue, Nov 27, 2018 at 04:24:40PM +0100, Roger Pau Monne 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>

Acked-by: Brian Woods <brian.woods@xxxxxxx>

Brian Woods

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