linux-kernel - Re: [RFC PATCH v5 02/11] ARM SMMU: Add capability IOMMU_CAP_DMA

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Message-ID: <20140428193709.GE22135@arm.com>
Date:	Mon, 28 Apr 2014 20:37:10 +0100
From:	Will Deacon <will.deacon@....com>
To:	Antonios Motakis <a.motakis@...tualopensystems.com>
Cc:	"alex.williamson@...hat.com" <alex.williamson@...hat.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>,
	Joerg Roedel <joro@...tes.org>,
	Varun Sethi <Varun.Sethi@...escale.com>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	Shuah Khan <shuah.kh@...sung.com>,
	"Upinder Malhi (umalhi)" <umalhi@...co.com>,
	"moderated list:ARM SMMU DRIVER" 
	<linux-arm-kernel@...ts.infradead.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH v5 02/11] ARM SMMU: Add capability IOMMU_CAP_DMA_EXEC

On Mon, Apr 28, 2014 at 04:52:42PM +0100, Antonios Motakis wrote:
> The ARM SMMU can take an IOMMU_EXEC protection flag in addition to
> IOMMU_READ and IOMMU_WRITE. Expose this as an IOMMU capability.

The other way of handling this would be to negate the capability and
advertise a NOEXEC cap instead. That would need the IOMMU_EXEC flag to
become IOMMU_NOEXEC and the ARM SMMU driver updating accordingly, but it
might make more sense if people don't object to mixing positive and negative
logic in the IOMMU_* flags.

Any thoughts?

Will
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