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

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Message-ID: <20150415035625.GC25040@voom.redhat.com>
Date:	Wed, 15 Apr 2015 13:56:25 +1000
From:	David Gibson <david@...son.dropbear.id.au>
To:	Alexey Kardashevskiy <aik@...abs.ru>
Cc:	linuxppc-dev@...ts.ozlabs.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	Alex Williamson <alex.williamson@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v8 01/31] vfio: powerpc/spapr: Move page pinning
 from arch code to VFIO IOMMU driver

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@...abs.ru>

Reviewed-by: David Gibson <david@...son.dropbear.id.au>

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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