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

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 05/05/15 14:59, Ian Campbell wrote:
> 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?

Nothing, it's hardcoded in the SMMU driver for now :/.

It's assuming SL0 = 1 which works fine for ARM32 but would be an issue
on platform with IPA >= 44 bits.

S2 output size may need to be restrict too depending of the PA bits.

Regards,

-- 
Julien Grall

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