From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: [OSSTEST PATCH] ts-kernel-build: Enable x86 IOMMU
	options
Date: Tue, 21 Apr 2015 12:51:34 -0400
Message-ID: <20150421165134.GA10465@l.oracle.com>
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To: Ian Campbell <ian.campbell@citrix.com>
Cc: xen-devel@lists.xenproject.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Ian Jackson <ian.jackson@eu.citrix.com>, David Vrabel <david.vrabel@citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>
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On Tue, Apr 21, 2015 at 04:44:07PM +0100, Ian Campbell wrote:
> On Tue, 2015-04-21 at 16:36 +0100, Ian Jackson wrote:
> > This has a variety of beneficial implications:
> > 
> >  * The kernel becomes more like the kind of distro kernels that Xen
> >    users are probably using.
> > 
> >  * We are more likely to discover any bugs in Linux where Linux
> >    running under Xen (eg as dom0) fights with Xen for control of io
> >    mediation resources or otherwise mishandles the situation.
> > 
> >  * A pleasant side effect is that in a kernel which does not yet have
> >    "config: Enable NEED_DMA_MAP_STATE when SWIOTLB is selected"
> >    (a bugfix), enabling INTEL_IOMMU has the side effect of enabling
> >    NEED_DMA_MAP_STATE and thus working around the bug.
> > 
> > The list of options to enable was derived by eyeballing
> > drivers/iommu/Kconfig from 3.14.34.
> > 
> > I will leave the question of whether to enable any ARM IOMMU options
> > for the Xen ARM folks to consider.
> 
> I've not got time right now, but lets not block on that:
> 
> > Signed-off-by: Ian Jackson <Ian.Jackson@eu.citrix.com>
> > CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> > CC: Boris Ostrovsky <boris.ostrovsky@oracle.com>
> > CC: David Vrabel <david.vrabel@citrix.com>
> > CC: Andrew Cooper <andrew.cooper3@citrix.com>
> 
> Acked-by: Ian Campbell <ian.campbell@citrix.com>

Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
> 
> Ian.
>