[Xen-devel] [PATCH 2/2] xen/arm: domain_build: Don't expose IOMMU specific properties to the guest

[Andrii Anisov <andrii.anisov@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>
Acked-by: Julien Grall <julien.grall@xxxxxxx>
---
 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 d2c63a8..15a08d6 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -540,6 +540,16 @@ static int __init 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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