[PATCH] x86: respect mapcache_domain_init() failing

[Jan Beulich]

The function itself properly handles and hands onwards failure from
create_perdomain_mapping(). Therefore its caller should respect possible
failure, too.

Fixes: 4b28bf6ae90b ("x86: re-introduce map_domain_page() et al")
Signed-off-by: Jan Beulich <jbeul...@suse.com>
---
Effectively split off of "x86/mapcache: Initialise the mapcache for the
idle domain", except that the change to respect the error wasn't even
mentioned there. Plus we likely want to backport this.

--- a/xen/arch/x86/domain.c
+++ b/xen/arch/x86/domain.c
@@ -858,7 +858,8 @@ int arch_domain_create(struct domain *d,
     }
     else if ( is_pv_domain(d) )
     {
-        mapcache_domain_init(d);
+        if ( (rc = mapcache_domain_init(d)) != 0 )
+            goto fail;
 
         if ( (rc = pv_domain_initialise(d)) != 0 )
             goto fail;