[PATCH v2 0/3] iommu/virtio: Misc fixes

[PATCH v2 0/3] iommu/virtio: Misc fixes

[Jean-Philippe Brucker]

A collection of fixes for the virtio-iommu driver. It might be too late
for v5.6 since they need more review. Patch 2 is new, the others were
posted separately. 

Jean-Philippe Brucker (3):
  iommu/virtio: Fix sparse warning
  iommu/virtio: Fix freeing of incomplete domains
  iommu/virtio: Reject IOMMU page granule larger than PAGE_SIZE

 include/uapi/linux/virtio_iommu.h | 12 ++++++------
 drivers/iommu/virtio-iommu.c      | 30 +++++++++++++++++++++---------
 2 files changed, 27 insertions(+), 15 deletions(-)

-- 
2.25.1

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[PATCH v2 1/3] iommu/virtio: Fix sparse warning

[Jean-Philippe Brucker]

We copied the virtio_iommu_config from the virtio-iommu specification,
which declares the fields using little-endian annotations (for example
le32). Unfortunately this causes sparse to warn about comparison between
little- and cpu-endian, because of the typecheck() in virtio_cread():

drivers/iommu/virtio-iommu.c:1024:9: sparse: sparse: incompatible types in comparison expression (different base types):
drivers/iommu/virtio-iommu.c:1024:9: sparse:    restricted __le64 *
drivers/iommu/virtio-iommu.c:1024:9: sparse:    unsigned long long *
drivers/iommu/virtio-iommu.c:1036:9: sparse: sparse: incompatible types in comparison expression (different base types):
drivers/iommu/virtio-iommu.c:1036:9: sparse:    restricted __le64 *
drivers/iommu/virtio-iommu.c:1036:9: sparse:    unsigned long long *
drivers/iommu/virtio-iommu.c:1040:9: sparse: sparse: incompatible types in comparison expression (different base types):
drivers/iommu/virtio-iommu.c:1040:9: sparse:    restricted __le64 *
drivers/iommu/virtio-iommu.c:1040:9: sparse:    unsigned long long *
drivers/iommu/virtio-iommu.c:1044:9: sparse: sparse: incompatible types in comparison expression (different base types):
drivers/iommu/virtio-iommu.c:1044:9: sparse:    restricted __le32 *
drivers/iommu/virtio-iommu.c:1044:9: sparse:    unsigned int *
drivers/iommu/virtio-iommu.c:1048:9: sparse: sparse: incompatible types in comparison expression (different base types):
drivers/iommu/virtio-iommu.c:1048:9: sparse:    restricted __le32 *
drivers/iommu/virtio-iommu.c:1048:9: sparse:    unsigned int *
drivers/iommu/virtio-iommu.c:1052:9: sparse: sparse: incompatible types in comparison expression (different base types):
drivers/iommu/virtio-iommu.c:1052:9: sparse:    restricted __le32 *
drivers/iommu/virtio-iommu.c:1052:9: sparse:    unsigned int *

Although virtio_cread() does convert virtio-endian (in our case
little-endian) to cpu-endian, the typecheck() needs the two arguments to
have the same endianness. Do as UAPI headers of other virtio devices do,
and remove the endian annotation from the device config.

Even though we change the UAPI this shouldn't cause any regression since
QEMU, the existing implementation of virtio-iommu that uses this header,
already removes the annotations when importing headers.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 include/uapi/linux/virtio_iommu.h | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/include/uapi/linux/virtio_iommu.h b/include/uapi/linux/virtio_iommu.h
index 237e36a280cb..48e3c29223b5 100644
--- a/include/uapi/linux/virtio_iommu.h
+++ b/include/uapi/linux/virtio_iommu.h
@@ -18,24 +18,24 @@
 #define VIRTIO_IOMMU_F_MMIO			5
 
 struct virtio_iommu_range_64 {
-	__le64					start;
-	__le64					end;
+	__u64					start;
+	__u64					end;
 };
 
 struct virtio_iommu_range_32 {
-	__le32					start;
-	__le32					end;
+	__u32					start;
+	__u32					end;
 };
 
 struct virtio_iommu_config {
 	/* Supported page sizes */
-	__le64					page_size_mask;
+	__u64					page_size_mask;
 	/* Supported IOVA range */
 	struct virtio_iommu_range_64		input_range;
 	/* Max domain ID size */
 	struct virtio_iommu_range_32		domain_range;
 	/* Probe buffer size */
-	__le32					probe_size;
+	__u32					probe_size;
 };
 
 /* Request types */
-- 
2.25.1

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[PATCH v2 2/3] iommu/virtio: Fix freeing of incomplete domains

[Jean-Philippe Brucker]

Calling viommu_domain_free() on a domain that hasn't been finalised (not
attached to any device, for example) can currently cause an Oops,
because we attempt to call ida_free() on ID 0, which may either be
unallocated or used by another domain.

Only initialise the vdomain->viommu pointer, which denotes a finalised
domain, at the end of a successful viommu_domain_finalise().

Fixes: edcd69ab9a32 ("iommu: Add virtio-iommu driver")
Reported-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
 drivers/iommu/virtio-iommu.c | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index cce329d71fba..5eed75cd121f 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -613,18 +613,20 @@ static int viommu_domain_finalise(struct viommu_dev *viommu,
 	int ret;
 	struct viommu_domain *vdomain = to_viommu_domain(domain);
 
-	vdomain->viommu		= viommu;
-	vdomain->map_flags	= viommu->map_flags;
+	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
+			      viommu->last_domain, GFP_KERNEL);
+	if (ret < 0)
+		return ret;
+
+	vdomain->id		= (unsigned int)ret;
 
 	domain->pgsize_bitmap	= viommu->pgsize_bitmap;
 	domain->geometry	= viommu->geometry;
 
-	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
-			      viommu->last_domain, GFP_KERNEL);
-	if (ret >= 0)
-		vdomain->id = (unsigned int)ret;
+	vdomain->map_flags	= viommu->map_flags;
+	vdomain->viommu		= viommu;
 
-	return ret > 0 ? 0 : ret;
+	return 0;
 }
 
 static void viommu_domain_free(struct iommu_domain *domain)
-- 
2.25.1

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[PATCH v2 3/3] iommu/virtio: Reject IOMMU page granule larger than PAGE_SIZE

[Jean-Philippe Brucker]

We don't currently support IOMMUs with a page granule larger than the
system page size. The IOVA allocator has a BUG_ON() in this case, and
VFIO has a WARN_ON().

Removing these obstacles ranges doesn't seem possible without major
changes to the DMA API and VFIO. Some callers of iommu_map(), for
example, want to map multiple page-aligned regions adjacent to each
others for scatter-gather purposes. Even in simple DMA API uses, a call
to dma_map_page() would let the endpoint access neighbouring memory. And
VFIO users cannot ensure that their virtual address buffer is physically
contiguous at the IOMMU granule.

Rather than triggering the IOVA BUG_ON() on mismatched page sizes, abort
the vdomain finalise() with an error message. We could simply abort the
viommu probe(), but an upcoming extension to virtio-iommu will allow
setting different page masks for each endpoint.

Reported-by: Bharat Bhushan <bbhushan2@marvell.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
---
v1->v2: Move to vdomain_finalise(), improve commit message
---
 drivers/iommu/virtio-iommu.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
index 5eed75cd121f..750f69c49b95 100644
--- a/drivers/iommu/virtio-iommu.c
+++ b/drivers/iommu/virtio-iommu.c
@@ -607,12 +607,22 @@ static struct iommu_domain *viommu_domain_alloc(unsigned type)
 	return &vdomain->domain;
 }
 
-static int viommu_domain_finalise(struct viommu_dev *viommu,
+static int viommu_domain_finalise(struct viommu_endpoint *vdev,
 				  struct iommu_domain *domain)
 {
 	int ret;
+	unsigned long viommu_page_size;
+	struct viommu_dev *viommu = vdev->viommu;
 	struct viommu_domain *vdomain = to_viommu_domain(domain);
 
+	viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap);
+	if (viommu_page_size > PAGE_SIZE) {
+		dev_err(vdev->dev,
+			"granule 0x%lx larger than system page size 0x%lx\n",
+			viommu_page_size, PAGE_SIZE);
+		return -EINVAL;
+	}
+
 	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
 			      viommu->last_domain, GFP_KERNEL);
 	if (ret < 0)
@@ -659,7 +669,7 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		 * Properly initialize the domain now that we know which viommu
 		 * owns it.
 		 */
-		ret = viommu_domain_finalise(vdev->viommu, domain);
+		ret = viommu_domain_finalise(vdev, domain);
 	} else if (vdomain->viommu != vdev->viommu) {
 		dev_err(dev, "cannot attach to foreign vIOMMU\n");
 		ret = -EXDEV;
-- 
2.25.1

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Re: [PATCH v2 2/3] iommu/virtio: Fix freeing of incomplete domains

[Robin Murphy]

On 2020-03-26 9:35 am, Jean-Philippe Brucker wrote:
> Calling viommu_domain_free() on a domain that hasn't been finalised (not
> attached to any device, for example) can currently cause an Oops,
> because we attempt to call ida_free() on ID 0, which may either be
> unallocated or used by another domain.
> 
> Only initialise the vdomain->viommu pointer, which denotes a finalised
> domain, at the end of a successful viommu_domain_finalise().

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Fixes: edcd69ab9a32 ("iommu: Add virtio-iommu driver")
> Reported-by: Eric Auger <eric.auger@redhat.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> ---
>   drivers/iommu/virtio-iommu.c | 16 +++++++++-------
>   1 file changed, 9 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index cce329d71fba..5eed75cd121f 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -613,18 +613,20 @@ static int viommu_domain_finalise(struct viommu_dev *viommu,
>   	int ret;
>   	struct viommu_domain *vdomain = to_viommu_domain(domain);
>   
> -	vdomain->viommu		= viommu;
> -	vdomain->map_flags	= viommu->map_flags;
> +	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
> +			      viommu->last_domain, GFP_KERNEL);
> +	if (ret < 0)
> +		return ret;
> +
> +	vdomain->id		= (unsigned int)ret;
>   
>   	domain->pgsize_bitmap	= viommu->pgsize_bitmap;
>   	domain->geometry	= viommu->geometry;
>   
> -	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
> -			      viommu->last_domain, GFP_KERNEL);
> -	if (ret >= 0)
> -		vdomain->id = (unsigned int)ret;
> +	vdomain->map_flags	= viommu->map_flags;
> +	vdomain->viommu		= viommu;
>   
> -	return ret > 0 ? 0 : ret;
> +	return 0;
>   }
>   
>   static void viommu_domain_free(struct iommu_domain *domain)
> 
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Re: [PATCH v2 3/3] iommu/virtio: Reject IOMMU page granule larger than PAGE_SIZE

[Robin Murphy]

On 2020-03-26 9:35 am, Jean-Philippe Brucker wrote:
> We don't currently support IOMMUs with a page granule larger than the
> system page size. The IOVA allocator has a BUG_ON() in this case, and
> VFIO has a WARN_ON().
> 
> Removing these obstacles ranges doesn't seem possible without major
> changes to the DMA API and VFIO. Some callers of iommu_map(), for
> example, want to map multiple page-aligned regions adjacent to each
> others for scatter-gather purposes. Even in simple DMA API uses, a call
> to dma_map_page() would let the endpoint access neighbouring memory. And
> VFIO users cannot ensure that their virtual address buffer is physically
> contiguous at the IOMMU granule.
> 
> Rather than triggering the IOVA BUG_ON() on mismatched page sizes, abort
> the vdomain finalise() with an error message. We could simply abort the
> viommu probe(), but an upcoming extension to virtio-iommu will allow
> setting different page masks for each endpoint.

Reviewed-by: Robin Murphy <robin.murphy@arm.com>

> Reported-by: Bharat Bhushan <bbhushan2@marvell.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> ---
> v1->v2: Move to vdomain_finalise(), improve commit message
> ---
>   drivers/iommu/virtio-iommu.c | 14 ++++++++++++--
>   1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 5eed75cd121f..750f69c49b95 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -607,12 +607,22 @@ static struct iommu_domain *viommu_domain_alloc(unsigned type)
>   	return &vdomain->domain;
>   }
>   
> -static int viommu_domain_finalise(struct viommu_dev *viommu,
> +static int viommu_domain_finalise(struct viommu_endpoint *vdev,
>   				  struct iommu_domain *domain)
>   {
>   	int ret;
> +	unsigned long viommu_page_size;
> +	struct viommu_dev *viommu = vdev->viommu;
>   	struct viommu_domain *vdomain = to_viommu_domain(domain);
>   
> +	viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap);
> +	if (viommu_page_size > PAGE_SIZE) {
> +		dev_err(vdev->dev,
> +			"granule 0x%lx larger than system page size 0x%lx\n",
> +			viommu_page_size, PAGE_SIZE);
> +		return -EINVAL;
> +	}
> +
>   	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
>   			      viommu->last_domain, GFP_KERNEL);
>   	if (ret < 0)
> @@ -659,7 +669,7 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
>   		 * Properly initialize the domain now that we know which viommu
>   		 * owns it.
>   		 */
> -		ret = viommu_domain_finalise(vdev->viommu, domain);
> +		ret = viommu_domain_finalise(vdev, domain);
>   	} else if (vdomain->viommu != vdev->viommu) {
>   		dev_err(dev, "cannot attach to foreign vIOMMU\n");
>   		ret = -EXDEV;
> 
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Re: [PATCH v2 3/3] iommu/virtio: Reject IOMMU page granule larger than PAGE_SIZE

[Auger Eric]

Hi Jean,

On 3/26/20 10:35 AM, Jean-Philippe Brucker wrote:
> We don't currently support IOMMUs with a page granule larger than the
> system page size. The IOVA allocator has a BUG_ON() in this case, and
> VFIO has a WARN_ON().
> 
> Removing these obstacles ranges doesn't seem possible without major
> changes to the DMA API and VFIO. Some callers of iommu_map(), for
> example, want to map multiple page-aligned regions adjacent to each
> others for scatter-gather purposes. Even in simple DMA API uses, a call
> to dma_map_page() would let the endpoint access neighbouring memory. And
> VFIO users cannot ensure that their virtual address buffer is physically
> contiguous at the IOMMU granule.
> 
> Rather than triggering the IOVA BUG_ON() on mismatched page sizes, abort
> the vdomain finalise() with an error message. We could simply abort the
> viommu probe(), but an upcoming extension to virtio-iommu will allow
> setting different page masks for each endpoint.
> 
> Reported-by: Bharat Bhushan <bbhushan2@marvell.com>
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Thanks

Eric
> ---
> v1->v2: Move to vdomain_finalise(), improve commit message
> ---
>  drivers/iommu/virtio-iommu.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 5eed75cd121f..750f69c49b95 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -607,12 +607,22 @@ static struct iommu_domain *viommu_domain_alloc(unsigned type)
>  	return &vdomain->domain;
>  }
>  
> -static int viommu_domain_finalise(struct viommu_dev *viommu,
> +static int viommu_domain_finalise(struct viommu_endpoint *vdev,
>  				  struct iommu_domain *domain)
>  {
>  	int ret;
> +	unsigned long viommu_page_size;
> +	struct viommu_dev *viommu = vdev->viommu;
>  	struct viommu_domain *vdomain = to_viommu_domain(domain);
>  
> +	viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap);
> +	if (viommu_page_size > PAGE_SIZE) {
> +		dev_err(vdev->dev,
> +			"granule 0x%lx larger than system page size 0x%lx\n",
> +			viommu_page_size, PAGE_SIZE);
> +		return -EINVAL;
> +	}
> +
>  	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
>  			      viommu->last_domain, GFP_KERNEL);
>  	if (ret < 0)
> @@ -659,7 +669,7 @@ static int viommu_attach_dev(struct iommu_domain *domain, struct device *dev)
>  		 * Properly initialize the domain now that we know which viommu
>  		 * owns it.
>  		 */
> -		ret = viommu_domain_finalise(vdev->viommu, domain);
> +		ret = viommu_domain_finalise(vdev, domain);
>  	} else if (vdomain->viommu != vdev->viommu) {
>  		dev_err(dev, "cannot attach to foreign vIOMMU\n");
>  		ret = -EXDEV;
> 

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RE: [EXT] Re: [PATCH v2 3/3] iommu/virtio: Reject IOMMU page granule larger than PAGE_SIZE

[Bharat Bhushan]

Hi Jean,

> -----Original Message-----
> From: Auger Eric <eric.auger@redhat.com>
> Sent: Thursday, March 26, 2020 11:11 PM
> To: Jean-Philippe Brucker <jean-philippe@linaro.org>; iommu@lists.linux-
> foundation.org
> Cc: virtualization@lists.linux-foundation.org; joro@8bytes.org; mst@redhat.com;
> jasowang@redhat.com; Bharat Bhushan <bbhushan2@marvell.com>
> Subject: [EXT] Re: [PATCH v2 3/3] iommu/virtio: Reject IOMMU page granule larger
> than PAGE_SIZE
> 
> External Email
> 
> ----------------------------------------------------------------------
> Hi Jean,
> 
> On 3/26/20 10:35 AM, Jean-Philippe Brucker wrote:
> > We don't currently support IOMMUs with a page granule larger than the
> > system page size. The IOVA allocator has a BUG_ON() in this case, and
> > VFIO has a WARN_ON().
> >
> > Removing these obstacles ranges doesn't seem possible without major
> > changes to the DMA API and VFIO. Some callers of iommu_map(), for
> > example, want to map multiple page-aligned regions adjacent to each
> > others for scatter-gather purposes. Even in simple DMA API uses, a
> > call to dma_map_page() would let the endpoint access neighbouring
> > memory. And VFIO users cannot ensure that their virtual address buffer
> > is physically contiguous at the IOMMU granule.
> >
> > Rather than triggering the IOVA BUG_ON() on mismatched page sizes,
> > abort the vdomain finalise() with an error message. We could simply
> > abort the viommu probe(), but an upcoming extension to virtio-iommu
> > will allow setting different page masks for each endpoint.
> >
> > Reported-by: Bharat Bhushan <bbhushan2@marvell.com>
> > Signed-off-by: Jean-Philippe Brucker <jean-philippe@linaro.org>
> Reviewed-by: Eric Auger <eric.auger@redhat.com>

Reviewed-by: Eric Auger <bbhushan2@marvell.com>

Thanks
-Bharat

> 
> Thanks
> 
> Eric
> > ---
> > v1->v2: Move to vdomain_finalise(), improve commit message
> > ---
> >  drivers/iommu/virtio-iommu.c | 14 ++++++++++++--
> >  1 file changed, 12 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/iommu/virtio-iommu.c
> > b/drivers/iommu/virtio-iommu.c index 5eed75cd121f..750f69c49b95 100644
> > --- a/drivers/iommu/virtio-iommu.c
> > +++ b/drivers/iommu/virtio-iommu.c
> > @@ -607,12 +607,22 @@ static struct iommu_domain
> *viommu_domain_alloc(unsigned type)
> >  	return &vdomain->domain;
> >  }
> >
> > -static int viommu_domain_finalise(struct viommu_dev *viommu,
> > +static int viommu_domain_finalise(struct viommu_endpoint *vdev,
> >  				  struct iommu_domain *domain)
> >  {
> >  	int ret;
> > +	unsigned long viommu_page_size;
> > +	struct viommu_dev *viommu = vdev->viommu;
> >  	struct viommu_domain *vdomain = to_viommu_domain(domain);
> >
> > +	viommu_page_size = 1UL << __ffs(viommu->pgsize_bitmap);
> > +	if (viommu_page_size > PAGE_SIZE) {
> > +		dev_err(vdev->dev,
> > +			"granule 0x%lx larger than system page size 0x%lx\n",
> > +			viommu_page_size, PAGE_SIZE);
> > +		return -EINVAL;
> > +	}
> > +
> >  	ret = ida_alloc_range(&viommu->domain_ids, viommu->first_domain,
> >  			      viommu->last_domain, GFP_KERNEL);
> >  	if (ret < 0)
> > @@ -659,7 +669,7 @@ static int viommu_attach_dev(struct iommu_domain
> *domain, struct device *dev)
> >  		 * Properly initialize the domain now that we know which viommu
> >  		 * owns it.
> >  		 */
> > -		ret = viommu_domain_finalise(vdev->viommu, domain);
> > +		ret = viommu_domain_finalise(vdev, domain);
> >  	} else if (vdomain->viommu != vdev->viommu) {
> >  		dev_err(dev, "cannot attach to foreign vIOMMU\n");
> >  		ret = -EXDEV;
> >

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Re: [PATCH v2 0/3] iommu/virtio: Misc fixes

[Joerg Roedel]

On Thu, Mar 26, 2020 at 10:35:55AM +0100, Jean-Philippe Brucker wrote:
> A collection of fixes for the virtio-iommu driver. It might be too late
> for v5.6 since they need more review. Patch 2 is new, the others were
> posted separately. 
> 
> Jean-Philippe Brucker (3):
>   iommu/virtio: Fix sparse warning
>   iommu/virtio: Fix freeing of incomplete domains
>   iommu/virtio: Reject IOMMU page granule larger than PAGE_SIZE

Applied, thanks.

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