[Xen-devel] [PATCH 1/4] xen: mask_rw_pte mark RO all pagetable pages up to pgt_buf_top

[stefano.stabellini@xxxxxxxxxxxxx]

From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>

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.

Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
---
 arch/x86/xen/mmu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index c82df6c..6b833db 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1491,7 +1491,7 @@ 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);
 
-- 
1.7.2.3


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