[Xen-devel] [PATCH v2 10/13] xen/arm: domain_build: Don't expose IOMMU specific properties to the guest

[Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>]

From: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>

We don't passthrough IOMMU device to DOM0 even if it is not used by
Xen. Therefore exposing the properties that describe relationship
between master devices and IOMMUs does not make any sense.

According to the:
1. Documentation/devicetree/bindings/iommu/iommu.txt
2. Documentation/devicetree/bindings/pci/pci-iommu.txt

Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
CC: Julien Grall <julien.grall@xxxxxxx>

---
   Changes in v1:
      -

   Changes in v2:
      - Skip optional properties too.
      - Clarify patch description
---
 xen/arch/arm/domain_build.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 3abacc0..fadfbbc 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -432,6 +432,16 @@ static int write_properties(struct domain *d, struct 
kernel_info *kinfo,
             continue;
         }
 
+        /* Don't expose IOMMU specific properties to the guest */
+        if ( dt_property_name_is_equal(prop, "iommus") )
+            continue;
+
+        if ( dt_property_name_is_equal(prop, "iommu-map") )
+            continue;
+
+        if ( dt_property_name_is_equal(prop, "iommu-map-mask") )
+            continue;
+
         res = fdt_property(kinfo->fdt, prop->name, prop_data, prop_len);
 
         if ( res )
-- 
2.7.4


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