linux-kernel - Re: [Xen-devel] [PATCH v7 7/8] xen/arm/arm64: introduce xen_arch_need

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Date:	Mon, 3 Nov 2014 11:01:49 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	<xen-devel@...ts.xensource.com>, <Ian.Campbell@...rix.com>,
	<linux-kernel@...r.kernel.org>, <david.vrabel@...rix.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v7 7/8] xen/arm/arm64: introduce xen_arch_need_swiotlb

On 03/11/14 10:45, Stefano Stabellini wrote:
> On Mon, 27 Oct 2014, Stefano Stabellini wrote:
>> Introduce an arch specific function to find out whether a particular dma
>> mapping operation needs to bounce on the swiotlb buffer.
>>
>> On ARM and ARM64, if the page involved is a foreign page and the device
>> is not coherent, we need to bounce because at unmap time we cannot
>> execute any required cache maintenance operations (we don't know how to
>> find the pfn from the mfn).
>>
>> No change of behaviour for x86.
>>
>> Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
>> Acked-by: Ian Campbell <ian.campbell@...rix.com>
> 
> Konrad, David, are you OK with the swiotlb-xen changes?

Reviewed-by: David Vrabel <david.vrabel@...rix.com>

But swiotlb is Konrad's responsibility.

David
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