linux-kernel - Re: [PATCHv7 01/26] iommu/arm-smmu: change IOMMU_EXEC to IOMMU

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Date:	Tue, 23 Sep 2014 15:58:16 +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>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"christoffer.dall@...aro.org" <christoffer.dall@...aro.org>,
	"kim.phillips@...escale.com" <kim.phillips@...escale.com>,
	"eric.auger@...aro.org" <eric.auger@...aro.org>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Joerg Roedel <joro@...tes.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Shuah Khan <shuah.kh@...sung.com>,
	Thierry Reding <treding@...dia.com>,
	Alexey Kardashevskiy <aik@...abs.ru>,
	"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: [PATCHv7 01/26] iommu/arm-smmu: change IOMMU_EXEC to IOMMU_NOEXEC

Hi Antonios,

On Tue, Sep 23, 2014 at 03:46:00PM +0100, Antonios Motakis wrote:
> Exposing the XN flag of the SMMU driver as IOMMU_NOEXEC instead of
> IOMMU_EXEC makes it enforceable, since for IOMMUs that don't support
> the XN flag pages will always be executable.
> 
> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
> ---
>  drivers/iommu/arm-smmu.c | 9 +++++----
>  include/linux/iommu.h    | 2 +-
>  2 files changed, 6 insertions(+), 5 deletions(-)

[...]

> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 20f9a52..e1a644c 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -27,7 +27,7 @@
>  #define IOMMU_READ	(1 << 0)
>  #define IOMMU_WRITE	(1 << 1)
>  #define IOMMU_CACHE	(1 << 2) /* DMA cache coherency */
> -#define IOMMU_EXEC	(1 << 3)
> +#define IOMMU_NOEXEC	(1 << 3)

This hunk needs to be a separate patch merged by Joerg before I can take the
arm-smmu part (which looks fine).

Will
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