[Xen-devel] [PATCH v3 55/62] arm/acpi: Route all Xen unused SPIs to Dom0

[shannon.zhao@xxxxxxxxxx]

From: Shannon Zhao <shannon.zhao@xxxxxxxxxx>

Route all SPIs to Dom0 except the interrupts that Xen uses. Since Xen
already uses the uart interrupt, the desc->action will not be NULL, so
it will skip it.

Signed-off-by: Shannon Zhao <shannon.zhao@xxxxxxxxxx>
---
 xen/arch/arm/domain_build.c | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/xen/arch/arm/domain_build.c b/xen/arch/arm/domain_build.c
index 6d8536b..6945f89 100644
--- a/xen/arch/arm/domain_build.c
+++ b/xen/arch/arm/domain_build.c
@@ -1360,6 +1360,35 @@ static int prepare_dtb(struct domain *d, struct 
kernel_info *kinfo)
 #define XEN_HYPERVISOR_ID 0x000058656E564D4D  /* "XenVMM" */
 #define ACPI_DOM0_FDT_MIN_SIZE 4096
 
+static int acpi_route_spi(struct domain *d)
+{
+    int i, res;
+    struct irq_desc *desc;
+
+    /* Don't route Xen used interrupt to Dom0. Since Xen already uses the uart
+     * interrupt, the desc->action will not be NULL, so it will skip it.
+     */
+    for( i = NR_LOCAL_IRQS; i < vgic_num_irqs(d); i++ )
+    {
+        /* Don't route uart interrupt to Dom0 */
+        desc = irq_to_desc(i);
+        if( desc->action != NULL)
+            continue;
+
+        vgic_reserve_virq(d, i);
+        irq_set_type(i, ACPI_IRQ_TYPE_NONE);
+        res = route_irq_to_guest(d, i, i, NULL);
+        if ( res )
+        {
+            printk(XENLOG_ERR "Unable to route IRQ %u to domain %u\n",
+                   i, d->domain_id);
+            continue;
+        }
+    }
+
+    return 0;
+}
+
 static int make_chosen_node(const struct kernel_info *kinfo,
                             struct membank tbl_add[])
 {
@@ -1897,6 +1926,10 @@ static int prepare_acpi(struct domain *d, struct 
kernel_info *kinfo)
     if ( rc != 0 )
         return rc;
 
+    rc = acpi_route_spi(d);
+    if ( rc != 0 )
+        return rc;
+
     return 0;
 }
 #else
-- 
2.1.0


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