Re: [Xen-devel] [PATCH v4 3/3] xen/iommu: arm: Use p2m_ipa_bits as stage2 input size

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Tue, 2015-05-05 at 14:48 +0100, Julien Grall wrote:
> > Do we need to also check that we are configuring the same number of
> > levels of PT etc, or is that already handled?
> 
> The SMMU only care about the number of IPA bits.

What ensures that the starting level of the SMMU matches the starting
level of the MMU-s2?

Feeding a 3-level table to an MMU which is configured to expect 4 won't
end well.

Ian.


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