[Xen-devel] [PATCH v2] xen/arm: Black list everything with a PPI

[Amit Singh Tomar <amittomer25@xxxxxxxxx>]

XEN should not forward PPIs to Dom0 as it only support SPIs.
One of solution to this problem is to skip any device that
uses PPI source completely while building domain itself.

This patch goes through all the interrupt sources of device and skip it
if one of interrupt source is PPI. It fixes XEN boot on i.MX8MQ by
skipping PMU node.

Suggested-by:  Julien Grall <julien.grall@xxxxxxx>
Signed-off-by: Amit Singh Tomar <amittomer25@xxxxxxxxx>
---
Changes since v1:
    * Added comment for PPIs range.
---
 xen/arch/arm/domain_build.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index d983677..5035758 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1353,7 +1353,7 @@ static int __init handle_node(struct domain *d, struct 
kernel_info *kinfo,
         { /* sentinel */ },
     };
     struct dt_device_node *child;
-    int res;
+    int res, i, nirq, irq_id;
     const char *name;
     const char *path;
 
@@ -1399,6 +1399,21 @@ static int __init handle_node(struct domain *d, struct 
kernel_info *kinfo,
         return 0;
     }
 
+    /* Skip the node, using PPI source */
+    nirq = dt_number_of_irq(node);
+
+    for ( i = 0 ; i < nirq ; i++ )
+    {
+        irq_id = platform_get_irq(node, i);
+
+        /* PPIs ranges from ID 16 to 31 */
+        if ( irq_id >= 16 && irq_id < 32 )
+        {
+            dt_dprintk(" Skip node with (PPI source)\n");
+            return 0;
+        }
+    }
+
     /*
      * Xen is using some path for its own purpose. Warn if a node
      * already exists with the same path.
-- 
2.7.4


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