[PATCH v2 1/6] vfio: implement iommu driver capabilities with an enum

[PATCH v2 1/6] vfio: implement iommu driver capabilities with an enum

[Antonios Motakis]

Currently a VFIO driver's IOMMU capabilities are encoded as a series of
numerical defines. Replace this with an enum for future maintainability.

Signed-off-by: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
---
 include/uapi/linux/vfio.h | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 6612974..1e39842 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -19,19 +19,18 @@
 
 /* Kernel & User level defines for VFIO IOCTLs. */
 
-/* Extensions */
-
-#define VFIO_TYPE1_IOMMU		1
-#define VFIO_SPAPR_TCE_IOMMU		2
-#define VFIO_TYPE1v2_IOMMU		3
 /*
- * IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping).  This
- * capability is subject to change as groups are added or removed.
+ * Capabilities exposed by the VFIO IOMMU driver. Some capabilities are subject
+ * to change as groups are added or removed.
  */
-#define VFIO_DMA_CC_IOMMU		4
-
-/* Check if EEH is supported */
-#define VFIO_EEH			5
+enum vfio_iommu_cap {
+	VFIO_TYPE1_IOMMU	= 1,
+	VFIO_SPAPR_TCE_IOMMU	= 2,
+	VFIO_TYPE1v2_IOMMU	= 3,
+	VFIO_DMA_CC_IOMMU	= 4, /* IOMMU enforces DMA cache coherence
+					(ex. PCIe NoSnoop stripping) */
+	VFIO_EEH		= 5, /* Check if EEH is supported */
+};
 
 /*
  * The IOCTL interface is designed for extensibility by embedding the
-- 
2.1.1

[PATCH v2 3/6] vfio: introduce the VFIO_DMA_MAP_FLAG_NOEXEC flag

[Antonios Motakis]

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-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
---
 include/uapi/linux/vfio.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
index 1e39842..06d66c9 100644
--- a/include/uapi/linux/vfio.h
+++ b/include/uapi/linux/vfio.h
@@ -30,6 +30,7 @@ enum vfio_iommu_cap {
 	VFIO_DMA_CC_IOMMU	= 4, /* IOMMU enforces DMA cache coherence
 					(ex. PCIe NoSnoop stripping) */
 	VFIO_EEH		= 5, /* Check if EEH is supported */
+	VFIO_DMA_NOEXEC_IOMMU	= 6,
 };
 
 /*
@@ -394,12 +395,17 @@ struct vfio_iommu_type1_info {
  *
  * Map process virtual addresses to IO virtual addresses using the
  * provided struct vfio_dma_map. Caller sets argsz. READ &/ WRITE required.
+ *
+ * To use the VFIO_DMA_MAP_FLAG_NOEXEC flag, the container must support the
+ * VFIO_DMA_NOEXEC_IOMMU capability. If mappings are created using this flag,
+ * any groups subsequently added to the container must support this capability.
  */
 struct vfio_iommu_type1_dma_map {
 	__u32	argsz;
 	__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) */
-- 
2.1.1

Re: [PATCH v2 1/6] vfio: implement iommu driver capabilities with an enum

[Alex Williamson]

On Mon, 2014-10-27 at 19:05 +0100, Antonios Motakis wrote:
> Currently a VFIO driver's IOMMU capabilities are encoded as a series of
> numerical defines. Replace this with an enum for future maintainability.
> 
> Signed-off-by: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
> ---
>  include/uapi/linux/vfio.h | 21 ++++++++++-----------
>  1 file changed, 10 insertions(+), 11 deletions(-)
> 
> diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> index 6612974..1e39842 100644
> --- a/include/uapi/linux/vfio.h
> +++ b/include/uapi/linux/vfio.h
> @@ -19,19 +19,18 @@
>  
>  /* Kernel & User level defines for VFIO IOCTLs. */
>  
> -/* Extensions */
> -
> -#define VFIO_TYPE1_IOMMU		1
> -#define VFIO_SPAPR_TCE_IOMMU		2
> -#define VFIO_TYPE1v2_IOMMU		3
>  /*
> - * IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping).  This
> - * capability is subject to change as groups are added or removed.
> + * Capabilities exposed by the VFIO IOMMU driver. Some capabilities are subject
> + * to change as groups are added or removed.
>   */
> -#define VFIO_DMA_CC_IOMMU		4
> -
> -/* Check if EEH is supported */
> -#define VFIO_EEH			5
> +enum vfio_iommu_cap {
> +	VFIO_TYPE1_IOMMU	= 1,
> +	VFIO_SPAPR_TCE_IOMMU	= 2,
> +	VFIO_TYPE1v2_IOMMU	= 3,
> +	VFIO_DMA_CC_IOMMU	= 4, /* IOMMU enforces DMA cache coherence
> +					(ex. PCIe NoSnoop stripping) */
> +	VFIO_EEH		= 5, /* Check if EEH is supported */
> +};

Your code base is a little out of date, you're missing:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/include/uapi/linux/vfio.h?id=f5c9ecebaf2a2c9381973798e389cc019dd983e0

I think the logic looks ok in the rest, but you'll need to use index 7
and the above commit touched the type1 c file as well so you may need to
adjustment there too.  Thanks,

Alex
>  
>  /*
>   * The IOCTL interface is designed for extensibility by embedding the

Re: [PATCH v2 1/6] vfio: implement iommu driver capabilities with an enum

[Antonios Motakis]

On Fri, Oct 31, 2014 at 9:04 PM, Alex Williamson
<alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>
> On Mon, 2014-10-27 at 19:05 +0100, Antonios Motakis wrote:
> > Currently a VFIO driver's IOMMU capabilities are encoded as a series of
> > numerical defines. Replace this with an enum for future maintainability.
> >
> > Signed-off-by: Antonios Motakis <a.motakis-lrHrjnjw1UfHK3s98zE1ajGjJy/sRE9J@public.gmane.org>
> > ---
> >  include/uapi/linux/vfio.h | 21 ++++++++++-----------
> >  1 file changed, 10 insertions(+), 11 deletions(-)
> >
> > diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h
> > index 6612974..1e39842 100644
> > --- a/include/uapi/linux/vfio.h
> > +++ b/include/uapi/linux/vfio.h
> > @@ -19,19 +19,18 @@
> >
> >  /* Kernel & User level defines for VFIO IOCTLs. */
> >
> > -/* Extensions */
> > -
> > -#define VFIO_TYPE1_IOMMU             1
> > -#define VFIO_SPAPR_TCE_IOMMU         2
> > -#define VFIO_TYPE1v2_IOMMU           3
> >  /*
> > - * IOMMU enforces DMA cache coherence (ex. PCIe NoSnoop stripping).  This
> > - * capability is subject to change as groups are added or removed.
> > + * Capabilities exposed by the VFIO IOMMU driver. Some capabilities are subject
> > + * to change as groups are added or removed.
> >   */
> > -#define VFIO_DMA_CC_IOMMU            4
> > -
> > -/* Check if EEH is supported */
> > -#define VFIO_EEH                     5
> > +enum vfio_iommu_cap {
> > +     VFIO_TYPE1_IOMMU        = 1,
> > +     VFIO_SPAPR_TCE_IOMMU    = 2,
> > +     VFIO_TYPE1v2_IOMMU      = 3,
> > +     VFIO_DMA_CC_IOMMU       = 4, /* IOMMU enforces DMA cache coherence
> > +                                     (ex. PCIe NoSnoop stripping) */
> > +     VFIO_EEH                = 5, /* Check if EEH is supported */
> > +};
>
> Your code base is a little out of date, you're missing:
>
> http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/include/uapi/linux/vfio.h?id=f5c9ecebaf2a2c9381973798e389cc019dd983e0
>
> I think the logic looks ok in the rest, but you'll need to use index 7
> and the above commit touched the type1 c file as well so you may need to
> adjustment there too.  Thanks,

Hello,

I will reapply on the latest version then.

Thanks

>
> Alex
> >
> >  /*
> >   * The IOCTL interface is designed for extensibility by embedding the
>
>
>