1 files changed, 8 insertions, 0 deletions

diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 7ef0903058ee..5016f19e1661 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2140,6 +2140,14 @@ struct vm_struct *alloc_vm_area(size_t size)
                 return NULL;
         }
 
+        /*
+         * If the allocated address space is passed to a hypercall
+         * before being used then we cannot rely on a page fault to
+         * trigger an update of the page tables.  So sync all the page
+         * tables here.
+         */
+        vmalloc_sync_all();
+
         return area;
 }
 EXPORT_SYMBOL_GPL(alloc_vm_area);