xen/riscv: implement prerequisites for domain_create()

arch_domain_create() and arch_sanitise_domain_config() are prerequisites for
domain_create().

arch_sanitise_domain_config() currently returns 0, as there is no specific
work required at this stage.

arch_domain_create() performs basic initialization, such as setting up the P2M
and initializing of next unused phandle.

Signed-off-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>
Acked-by: Jan Beulich <jbeulich@suse.com>

xen/arch/riscv/domain.c

@@ -289,6 +289,35 @@ void sync_vcpu_execstate(struct vcpu *v)
     /* Nothing to do -- no lazy switching */
 }
 
+int arch_sanitise_domain_config(struct xen_domctl_createdomain *config)
+{
+    return 0;
+}
+
+void arch_domain_destroy(struct domain *d)
+{
+    printk(XENLOG_WARNING "%s: unimplemented\n", __func__);
+}
+
+int arch_domain_create(struct domain *d,
+                       struct xen_domctl_createdomain *config,
+                       unsigned int flags)
+{
+    int rc = 0;
+
+    if ( is_idle_domain(d) )
+        return 0;
+
+    if ( (rc = p2m_init(d, config)) != 0)
+        goto fail;
+
+    return rc;
+
+ fail:
+    arch_domain_destroy(d);
+    return rc;
+}
+
 static void __init __maybe_unused build_assertions(void)
 {
     /*

xen/arch/riscv/stubs.c

@@ -101,28 +101,11 @@ void dump_pageframe_info(struct domain *d)
     BUG_ON("unimplemented");
 }
 
-int arch_sanitise_domain_config(struct xen_domctl_createdomain *config)
-{
-    BUG_ON("unimplemented");
-}
-
-int arch_domain_create(struct domain *d,
-                       struct xen_domctl_createdomain *config,
-                       unsigned int flags)
-{
-    BUG_ON("unimplemented");
-}
-
 int arch_domain_teardown(struct domain *d)
 {
     BUG_ON("unimplemented");
 }
 
-void arch_domain_destroy(struct domain *d)
-{
-    BUG_ON("unimplemented");
-}
-
 void arch_domain_shutdown(struct domain *d)
 {
     BUG_ON("unimplemented");