dom0less: Allow arch_parse_dom0less_node() to be fallible

Let the function return an errno, so fallible bindings are not precluded.

Signed-off-by: Alejandro Vallejo <alejandro.garciavallejo@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>

xen/arch/arm/dom0less-build.c

@@ -272,8 +272,8 @@ int __init init_vuart(struct domain *d, struct kernel_info *kinfo,
     return rc;
 }
 
-void __init arch_parse_dom0less_node(struct dt_device_node *node,
-                                     struct boot_domain *bd)
+int __init arch_parse_dom0less_node(struct dt_device_node *node,
+                                    struct boot_domain *bd)
 {
     struct xen_domctl_createdomain *d_cfg = &bd->create_cfg;
     unsigned int flags = bd->create_flags;
@@ -354,6 +354,8 @@ void __init arch_parse_dom0less_node(struct dt_device_node *node,
         if ( !val )
             d_cfg->flags &= ~XEN_DOMCTL_CDF_trap_unmapped_accesses;
     }
+
+    return 0;
 }
 
 int __init init_intc_phandle(struct kernel_info *kinfo, const char *name,

xen/common/device-tree/dom0less-build.c

@@ -960,7 +960,8 @@ void __init create_domUs(void)
             panic("'llc-colors' found, but LLC coloring is disabled\n");
 #endif
 
-        arch_parse_dom0less_node(node, &ki.bd);
+        if ( (rc = arch_parse_dom0less_node(node, &ki.bd)) )
+            panic("error parsing arch-specific dom0less props (rc=%d)", rc);
 
         /*
          * The variable max_init_domid is initialized with zero, so here it's

xen/include/xen/dom0less-build.h

@@ -9,7 +9,7 @@ struct domain;
 
 #ifdef CONFIG_DOM0LESS_BOOT
 
-struct xen_domctl_createdomain;
+struct boot_domain;
 struct dt_device_node;
 struct kernel_info;
 
@@ -45,8 +45,8 @@ void create_domUs(void);
 bool is_dom0less_mode(void);
 void set_xs_domain(struct domain *d);
 
-void arch_parse_dom0less_node(struct dt_device_node *node,
-                              struct boot_domain *bd);
+int arch_parse_dom0less_node(struct dt_device_node *node,
+                             struct boot_domain *bd);
 
 int init_vuart(struct domain *d, struct kernel_info *kinfo,
                const struct dt_device_node *node);