linux-kernel - Re: [PATCH 2/5] vfio: introduce the VFIO_DMA_MAP_FLAG

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Date:	Mon, 20 Oct 2014 15:29:43 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Antonios Motakis <a.motakis@...tualopensystems.com>
Cc:	kvmarm@...ts.cs.columbia.edu, iommu@...ts.linux-foundation.org,
	will.deacon@....com, tech@...tualopensystems.com,
	christoffer.dall@...aro.org, eric.auger@...aro.org,
	kim.phillips@...escale.com, marc.zyngier@....com,
	"open list:VFIO DRIVER" <kvm@...r.kernel.org>,
	"open list:ABI/API" <linux-api@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] vfio: introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag

On Mon, 2014-10-13 at 15:09 +0200, Antonios Motakis wrote:
> We introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag to the VFIO dma map call,
> and expose its availability via the capability VFIO_DMA_NOEXEC_IOMMU.
> This way the user can control whether the XN flag will be set on the
> requested mappings. The IOMMU_NOEXEC flag needs to be available for all
> the IOMMUs of the container used.
> 
> Signed-off-by: Antonios Motakis <a.motakis@...tualopensystems.com>
> ---
>  include/uapi/linux/vfio.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 6612974..111b5e8 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -29,6 +29,7 @@
>   * capability is subject to change as groups are added or removed.
>   */
>  #define VFIO_DMA_CC_IOMMU		4
> +#define VFIO_DMA_NOEXEC_IOMMU		5
>  
>  /* Check if EEH is supported */
>  #define VFIO_EEH			5
                                    ^^
5 is still already used.  Feel free to convert to enum so we stop making
this mistake.

> @@ -401,6 +402,7 @@ struct vfio_iommu_type1_dma_map {
>  	__u32	flags;
>  #define VFIO_DMA_MAP_FLAG_READ (1 << 0)		/* readable from device */
>  #define VFIO_DMA_MAP_FLAG_WRITE (1 << 1)	/* writable from device */
> +#define VFIO_DMA_MAP_FLAG_NOEXEC (1 << 2)	/* not executable from device */
>  	__u64	vaddr;				/* Process virtual address */
>  	__u64	iova;				/* IO virtual address */
>  	__u64	size;				/* Size of mapping (bytes) */



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