xen: unpin initial Xen pagetable once we're finished with it

Unpin the Xen-provided pagetable once we've finished with it, so it
doesn't cause stray references which cause later swapper_pg_dir
pagetable updates to fail.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Tested-by: Jody Belka <knew-linux@pimb.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index de647bc6e74d..49e5358f481a 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -798,6 +798,10 @@ static __init void xen_pagetable_setup_start(pgd_t *base)
          * added to the table can be prepared properly for Xen.
          */
         xen_write_cr3(__pa(base));
+
+        /* Unpin initial Xen pagetable */
+        pin_pagetable_pfn(MMUEXT_UNPIN_TABLE,
+                          PFN_DOWN(__pa(xen_start_info->pt_base)));
 }
 
 static __init void xen_pagetable_setup_done(pgd_t *base)