Re: [PATCH kernel v8 01/31] vfio: powerpc/spapr: Move page pinning from arch code to VFIO IOMMU driver

From: David Gibson
Date: Wed Apr 15 2015 - 02:10:47 EST

On Fri, Apr 10, 2015 at 04:30:43PM +1000, Alexey Kardashevskiy wrote:
> This moves page pinning (get_user_pages_fast()/put_page()) code out of
> the platform IOMMU code and puts it to VFIO IOMMU driver where it belongs
> to as the platform code does not deal with page pinning.
> This makes iommu_take_ownership()/iommu_release_ownership() deal with
> the IOMMU table bitmap only.
> This removes page unpinning from iommu_take_ownership() as the actual
> TCE table might contain garbage and doing put_page() on it is undefined
> behaviour.
> Besides the last part, the rest of the patch is mechanical.
> Signed-off-by: Alexey Kardashevskiy <aik@xxxxxxxxx>

Reviewed-by: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>

David Gibson | I'll have my music baroque, and my code
david AT | minimalist, thank you. NOT _the_ _other_
| _way_ _around_!

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