xen/arm: enable statically shared memory on Dom0

To add statically shared memory nodes in Dom0, user shall put according
static shared memory configuration under /chosen node.

This commit adds shm-processing function process_shm in construct_dom0
to enable statically shared memory on Dom0.

Signed-off-by: Penny Zheng <penny.zheng@arm.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/domain_build.c

@@ -2709,6 +2709,11 @@ static int __init handle_node(struct domain *d, struct kernel_info *kinfo,
             if ( res )
                 return res;
         }
+
+        res = make_resv_memory_node(d, kinfo->fdt, addrcells, sizecells,
+                                    &kinfo->shm_mem);
+        if ( res )
+            return res;
     }
 
     res = fdt_end_node(kinfo->fdt);
@@ -3937,6 +3942,9 @@ static int __init construct_dom0(struct domain *d)
 {
     struct kernel_info kinfo = {};
     int rc;
+#ifdef CONFIG_STATIC_SHM
+    const struct dt_device_node *chosen = dt_find_node_by_path("/chosen");
+#endif
 
     /* Sanity! */
     BUG_ON(d->domain_id != 0);
@@ -3971,6 +3979,12 @@ static int __init construct_dom0(struct domain *d)
     allocate_memory_11(d, &kinfo);
     find_gnttab_region(d, &kinfo);
 
+#ifdef CONFIG_STATIC_SHM
+    rc = process_shm(d, &kinfo, chosen);
+    if ( rc < 0 )
+        return rc;
+#endif
+
     /* Map extra GIC MMIO, irqs and other hw stuffs to dom0. */
     rc = gic_map_hwdom_extra_mappings(d);
     if ( rc < 0 )