linux-kernel - Re: [RFC PATCH v6 03/20] iommu/arm-smmu: add IOMMU_CAP

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Message-ID: <20140616153000.GT16758@arm.com>
Date:	Mon, 16 Jun 2014 16:30:00 +0100
From:	Will Deacon <will.deacon@....com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	Antonios Motakis <a.motakis@...tualopensystems.com>,
	"kvmarm@...ts.cs.columbia.edu" <kvmarm@...ts.cs.columbia.edu>,
	"iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
	"tech@...tualopensystems.com" <tech@...tualopensystems.com>,
	"a.rigo@...tualopensystems.com" <a.rigo@...tualopensystems.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"kim.phillips@...escale.com" <kim.phillips@...escale.com>,
	"stuart.yoder@...escale.com" <stuart.yoder@...escale.com>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	Joerg Roedel <joro@...tes.org>,
	"moderated list:ARM SMMU DRIVER" 
	<linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v6 03/20] iommu/arm-smmu: add IOMMU_CAP_NOEXEC to the
 ARM SMMU driver

On Mon, Jun 16, 2014 at 04:25:28PM +0100, Alex Williamson wrote:
> On Mon, 2014-06-16 at 16:04 +0100, Will Deacon wrote:
> > On Thu, Jun 05, 2014 at 06:03:11PM +0100, Antonios Motakis wrote:
> > > The ARM SMMU supports the IOMMU_NOEXEC protection flag. Add the
> > > corresponding IOMMU capability.
> > > 
> > > Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
> > > ---
> > >  drivers/iommu/arm-smmu.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > > 
> > > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> > > index d5a2200..15ab2af 100644
> > > --- a/drivers/iommu/arm-smmu.c
> > > +++ b/drivers/iommu/arm-smmu.c
> > > @@ -1544,6 +1544,8 @@ static int arm_smmu_domain_has_cap(struct iommu_domain *domain,
> > >  	if (smmu_domain->root_cfg.smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
> > >  		caps |= IOMMU_CAP_CACHE_COHERENCY;
> > >  
> > > +	caps |= IOMMU_CAP_NOEXEC;
> > > +
> > 
> > Just initialise caps to IOMMU_CAP_NOEXEC.
> 
> No, it shouldn't be a bitmap in the first place.  Thanks,

Ah, ok. I probably led Antonios down the garden path with the ARM SMMU
driver then. Apologies!

Will
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