[Xen-changelog] [xen staging] xen/arm: domain_build: Black list devices using PPIs

[patchbot@xxxxxxx]

commit 9b1a31922ac066ef0dffe36ebd6a6ba016567d69
Author:     Amit Singh Tomar <amittomer25@xxxxxxxxx>
AuthorDate: Sun Jun 23 18:26:31 2019 +0530
Commit:     Julien Grall <julien.grall@xxxxxxx>
CommitDate: Tue Jul 9 15:15:24 2019 +0100

    xen/arm: domain_build: Black list devices using PPIs
    
    Currently, the vGIC is not able to cope with hardware PPIs routed to guests.
    One of the solutions to this problem is to skip any device that uses PPI
    source completely while building the domain itself.
    
    This patch goes through all the interrupt sources of a device and skip it
    if one of the interrupts sources is a PPI. It fixes XEN boot on i.MX8MQ by
    skipping the PMU node.
    
    Suggested-by:  Julien Grall <julien.grall@xxxxxxx>
    Signed-off-by: Amit Singh Tomar <amittomer25@xxxxxxxxx>
    Acked-by: Julien Grall <julien.grall@xxxxxxx>
---
 xen/arch/arm/domain_build.c | 20 +++++++++++++++++++-
 1 file changed, 19 insertions(+), 1 deletion(-)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index d9836779d1..16ce5222ca 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;
 
@@ -1400,6 +1400,24 @@ static int __init handle_node(struct domain *d, struct 
kernel_info *kinfo,
     }
 
     /*
+     * The vGIC does not support routing hardware PPIs to guest. So
+     * we need to skip any node using PPIs.
+     */
+    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 it (using PPIs)\n");
+            return 0;
+        }
+    }
+
+    /*
      * Xen is using some path for its own purpose. Warn if a node
      * already exists with the same path.
      */
--
generated by git-patchbot for /home/xen/git/xen.git#staging

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