xen-dom-mgmt: Add weak functions for user configurations

Provide weak functions for user configurations in the xen-dom-mgmt
allowing apps to extend the list of configurations for a domain.

Signed-off-by: Mykyta Poturai <[email protected]>

xen-dom-mgmt/include/xen_dom_mgmt.h

@@ -64,6 +64,23 @@ int domain_post_create(const struct xen_domain_cfg *domcfg, uint32_t domid);
  */
 struct xen_domain_cfg *domain_find_config(char *name);
 
+/**
+ * This function returns the count of user configurations for a domain.
+ *
+ * The function is defined as weak, so it can be overridden by the user.
+ * @return The count of user configurations.
+ */
+int domain_get_user_cfg_count(void);
+
+/**
+ * This function returns the user configuration for a domain specified by the given index.
+ *
+ * The function is defined as weak, so it can be overridden by the user.
+ * @param id The ID of the domain.
+ * @return The user configuration for the domain, or NULL if not found.
+ */
+struct xen_domain_cfg *domain_get_user_cfg(int index);
+
 #ifdef CONFIG_XEN_DOMCFG_SECTION
 #define DECL_CONFIG static __section(".domain_configs") __used
 extern struct xen_domain_cfg _domain_configs_start[];

xen-dom-mgmt/src/xen-dom-mgmt.c

@@ -620,6 +620,14 @@ struct xen_domain *domid_to_domain(uint32_t domid)
 struct xen_domain_cfg *domain_find_config(char *name)
 {
 	__maybe_unused struct xen_domain_cfg *cfg = NULL;
+	int i;
+
+	for (i = 0; i < domain_get_user_cfg_count(); i++) {
+		cfg = domain_get_user_cfg(i);
+		if (strncmp(cfg->name, name, CONTAINER_NAME_SIZE) == 0) {
+			return cfg;
+		}
+	}
 
 #ifdef CONFIG_XEN_DOMCFG_SECTION
 	for (cfg = _domain_configs_start; cfg < _domain_configs_end; cfg++) {
@@ -632,6 +640,17 @@ struct xen_domain_cfg *domain_find_config(char *name)
 	return NULL;
 }
 
+__weak int domain_get_user_cfg_count(void)
+{
+	return 0;
+}
+
+__weak struct xen_domain_cfg *domain_get_user_cfg(int index)
+{
+	ARG_UNUSED(index);
+	return NULL;
+}
+
 int domain_create(struct xen_domain_cfg *domcfg, uint32_t domid)
 {
 	int rc = 0;