Commit 7a71cef7 authored by bibo,mao's avatar bibo,mao Committed by Andi Kleen

[PATCH] x86-64: x86_64 add NX mask for PTE entry

    If function change_page_attr_addr calls revert_page to revert
to original pte value, mk_pte_phys does not mask NX bit. If NX bit
is set on no NX hardware supported x86_64 machine, there is will
be RSVD type page fault and system will crash. This patch adds NX
mask bit for PTE entry.
Signed-off-by: default avatarbibo,mao <bibo.mao@intel.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
parent 690a973f
...@@ -366,6 +366,7 @@ static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot) ...@@ -366,6 +366,7 @@ static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
{ {
pte_t pte; pte_t pte;
pte_val(pte) = physpage | pgprot_val(pgprot); pte_val(pte) = physpage | pgprot_val(pgprot);
pte_val(pte) &= __supported_pte_mask;
return pte; return pte;
} }
......
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