xen: fix mismerge in masking pte flags

Looks like a mismerge/misapply dropped one of the cases of pte flag
masking for Xen.  Also, only mask the flags for present ptes.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 6 insertions, 4 deletions

diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3e9e095c295c..e6184735545f 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -241,8 +241,10 @@ unsigned long long xen_pgd_val(pgd_t pgd)
 
 pte_t xen_make_pte(unsigned long long pte)
 {
-        if (pte & 1)
+        if (pte & _PAGE_PRESENT) {
                 pte = phys_to_machine(XPADDR(pte)).maddr;
+                pte &= ~(_PAGE_PCD | _PAGE_PWT);
+        }
 
         return (pte_t){ .pte = pte };
 }
@@ -288,10 +290,10 @@ unsigned long xen_pgd_val(pgd_t pgd)
 
 pte_t xen_make_pte(unsigned long pte)
 {
-        if (pte & _PAGE_PRESENT)
+        if (pte & _PAGE_PRESENT) {
                 pte = phys_to_machine(XPADDR(pte)).maddr;
-
-        pte &= ~(_PAGE_PCD | _PAGE_PWT);
+                pte &= ~(_PAGE_PCD | _PAGE_PWT);
+        }
 
         return (pte_t){ pte };
 }