1st step shows we should NOT disable the iommu when it is already
enabled. But current code does disable-enable. So there is still works
to do.
The original kernel does a disable and re-enable , Bill's patchset
removed the disable operation.
I think step 2 is necessary, because when the driver initializes, the
device need a new map, and the old data from the old kernel can not be
used for the new driver.
Now I am trying to implement these ideas.
Thanks
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