xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top

mask_rw_pte is currently checking if a pfn is a pagetable page if it
falls in the range pgt_buf_start - pgt_buf_end but that is incorrect
because pgt_buf_end is a moving target: pgt_buf_top is the real
boundary.

Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 1bca25f60ff2..55c965b38c27 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1616,7 +1616,7 @@ static __init pte_t mask_rw_pte(pte_t *ptep, pte_t pte)
          * it is RO.
          */
         if (((!is_early_ioremap_ptep(ptep) &&
-                        pfn >= pgt_buf_start && pfn < pgt_buf_end)) ||
+                        pfn >= pgt_buf_start && pfn < pgt_buf_top)) ||
                         (is_early_ioremap_ptep(ptep) && pfn != (pgt_buf_end - 1)))
                 pte = pte_wrprotect(pte);