Re: [Xen-devel] [PATCH v2 2/2] VT-d: reconcile iommu_inclusive_mapping and iommu=dom0-strict

[Roger Pau Monné <roger.pau@xxxxxxxxxx>]

On Tue, Jun 12, 2018 at 02:47:34PM +0100, Paul Durrant wrote:
> The documentation for the iommu_inclusive_mapping Xen command line option
> states:
> 
> "Use this to work around firmware issues providing incorrect RMRR entries"
> 
> Unfortunately this workaround does not function correctly if the dom0-strict
> iommu option is also specified.
> 
> The documentation goes on to say:
> 
> "Rather than only mapping RAM pages for IOMMU accesses for Dom0, with this
>  option all pages up to 4GB, not marked as unusable in the E820 table, will
>  get a mapping established."
> 
> This patch modifies the VT-d hardware domain initialization code such that
> the workaround will continue to function in dom0-strict mode, by mapping
> all pages not marked as unusable *unless* they are RAM pages not assigned
> to dom0.
> 
> Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>

Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>

Thanks, Roger.

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