From: Hongyan Xia <hongyxia@amazon.com>

The root page table is allocated from the domheap and isn't
mapped by default. Map it on demand to build pv shim domain.

Signed-off-by: Hongyan Xia <hongyxia@amazon.com>
Signed-off-by: Elias El Yandouzi <eliasely@amazon.com>

----

    Changes in v2:
        * New patch

diff --git a/xen/arch/x86/pv/dom0_build.c b/xen/arch/x86/pv/dom0_build.c
index dc5e9fe117..fc51c7d362 100644
--- a/xen/arch/x86/pv/dom0_build.c
+++ b/xen/arch/x86/pv/dom0_build.c
@@ -991,8 +991,12 @@ do {                                                    \
      * !CONFIG_VIDEO case so the logic here can be simplified.
      */
     if ( pv_shim )
+    {
+        l4start = map_domain_page(l4start_mfn);
         pv_shim_setup_dom(d, l4start, v_start, vxenstore_start, vconsole_start,
                           vphysmap_start, si);
+        UNMAP_DOMAIN_PAGE(l4start);
+    }
 
 #ifdef CONFIG_COMPAT
     if ( compat )
-- 
2.40.1