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authorJeremy Fitzhardinge <jeremy@goop.org>2008-06-16 15:01:53 -0700
committerIngo Molnar <mingo@elte.hu>2008-06-20 14:56:36 +0200
commit05345b0f006ac226d0d25d48fcb2d792ac44a071 (patch)
treedfb335dc2dd441de5772c47186a5403e64909b66
parent46539383791a0e59a4af7412056dfbfc5240af0a (diff)
xen: mask unwanted pte bits in __supported_pte_mask
[ Stable: this isn't a bugfix in itself, but it's a pre-requiste for "xen: don't drop NX bit" ] Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Cc: Stable Kernel <stable@kernel.org> Cc: the arch/x86 maintainers <x86@kernel.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--arch/x86/xen/enlighten.c5
-rw-r--r--arch/x86/xen/mmu.c4
2 files changed, 6 insertions, 3 deletions
diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index c8a56e457d61..c048de34d6a1 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -1228,6 +1228,11 @@ asmlinkage void __init xen_start_kernel(void)
if (xen_feature(XENFEAT_supervisor_mode_kernel))
pv_info.kernel_rpl = 0;
+ /* Prevent unwanted bits from being set in PTEs. */
+ __supported_pte_mask &= ~_PAGE_GLOBAL;
+ if (!is_initial_xendomain())
+ __supported_pte_mask &= ~(_PAGE_PWT | _PAGE_PCD);
+
/* set the limit of our address space */
xen_reserve_top();
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 3525ef523a74..3f2a67fe6ad6 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -199,10 +199,8 @@ pgdval_t xen_pgd_val(pgd_t pgd)
pte_t xen_make_pte(pteval_t pte)
{
- if (pte & _PAGE_PRESENT) {
+ if (pte & _PAGE_PRESENT)
pte = phys_to_machine(XPADDR(pte)).maddr;
- pte &= ~(_PAGE_PCD | _PAGE_PWT);
- }
return (pte_t){ .pte = pte };
}