[RFC] Use SMMU HTTU for DMA dirty page tracking

Hi all,

Is there any plan for enabling SMMU HTTU?

I have seen the patch locates in the SVA series patch, which adds
support for HTTU:
    https://www.spinics.net/lists/arm-kernel/msg798694.html

HTTU reduces the number of access faults on SMMU fault queue
(permission faults also benifit from it).

Besides reducing the faults, HTTU also helps to track dirty pages for
device DMA. Is it feasible to utilize HTTU to get dirty pages on device
DMA during VFIO live migration?

If SMMU can track dirty pages, devices are not required to implement
additional dirty pages tracking to support VFIO live migration.

-- 
Thanks,
Xiang


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