linux-kernel - Re: [PATCH kernel v9 08/32] vfio: powerpc/spapr: Moving pinning/unpinning to helpers

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Date:	Wed, 29 Apr 2015 12:14:03 +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>,
	Gavin Shan <gwshan@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH kernel v9 08/32] vfio: powerpc/spapr: Moving
 pinning/unpinning to helpers

On Sat, Apr 25, 2015 at 10:14:32PM +1000, Alexey Kardashevskiy wrote:
> This is a pretty mechanical patch to make next patches simpler.
> 
> New tce_iommu_unuse_page() helper does put_page() now but it might skip
> that after the memory registering patch applied.
> 
> As we are here, this removes unnecessary checks for a value returned
> by pfn_to_page() as it cannot possibly return NULL.
> 
> This moves tce_iommu_disable() later to let tce_iommu_clear() know if
> the container has been enabled because if it has not been, then
> put_page() must not be called on TCEs from the TCE table. This situation
> is not yet possible but it will after KVM acceleration patchset is
> applied.
> 
> This changes code to work with physical addresses rather than linear
> mapping addresses for better code readability. Following patches will
> add an xchg() callback for an IOMMU table which will accept/return
> physical addresses (unlike current tce_build()) which will eliminate
> redundant conversions.
> 
> Signed-off-by: Alexey Kardashevskiy <aik@...abs.ru>
> [aw: for the vfio related changes]
> Acked-by: Alex Williamson <alex.williamson@...hat.com>

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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