[Xen-devel] [PATCH 3/7] xen/arm: Prepare SMMU resources for protected devices

[Wei Chen <Wei.Chen@xxxxxxx>]

In previous code, while we are constructing Dom0, we will assign
all devices except passthrough devices to Dom0. In the later, when
we start the DomU, the assign_device will prepare SMMU resources
for the devices passthrough to DomU. This is ok when we kept the
add_device code in assign_device. But currently, we have separated
add_device from assign_device. If we don't prepare SMMU resources
for passthrough devices, these devices would not work properly in
DomU.

So, while we are handling all devices DT node in construction Dom0,
we will call add_device to prepare SMMU resources for all protected
devices, regardless of passthrough or not.

Signed-off-by: Wei Chen <Wei.Chen@xxxxxxx>
---
 xen/arch/arm/domain_build.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index c6776d7..6aea427 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1082,6 +1082,18 @@ static int handle_device(struct domain *d, struct 
dt_device_node *dev,
     dt_dprintk("%s passthrough = %d nirq = %d naddr = %u\n",
                dt_node_full_name(dev), need_mapping, nirq, naddr);
 
+    /*
+     * If this device is behind the SMMU, the add_device callback will
+     * prepare resource for it. Otherwise, add_device has no effect.
+     */
+    res = iommu_add_dt_device(d, dev);
+    if ( res )
+    {
+        printk(XENLOG_ERR "Failed to add device to IOMMU for %s\n",
+               dt_node_full_name(dev));
+        return res;
+    }
+
     if ( dt_device_is_protected(dev) && need_mapping )
     {
         dt_dprintk("%s setup iommu\n", dt_node_full_name(dev));
-- 
2.7.4


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