linux-kernel - [PATCH] [10/19] x86_64: x86_64 add NX mask for PTE entry

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Message-Id: <20061021165130.40E2213C4D@wotan.suse.de>
Date:	Sat, 21 Oct 2006 18:51:30 +0200 (CEST)
From:	Andi Kleen <ak@...e.de>
To:	"bibo,mao" <bibo.mao@...el.com>, patches@...-64.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] [10/19] x86_64: x86_64 add NX mask for PTE entry


From: "bibo,mao" <bibo.mao@...el.com>

    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: bibo,mao <bibo.mao@...el.com>
Signed-off-by: Andi Kleen <ak@...e.de>

---
 include/asm-x86_64/pgtable.h |    1 +
 1 files changed, 1 insertion(+)

Index: linux/include/asm-x86_64/pgtable.h
===================================================================
--- linux.orig/include/asm-x86_64/pgtable.h
+++ linux/include/asm-x86_64/pgtable.h
@@ -366,6 +366,7 @@ static inline pte_t mk_pte_phys(unsigned
 { 
 	pte_t pte;
 	pte_val(pte) = physpage | pgprot_val(pgprot); 
+	pte_val(pte) &= __supported_pte_mask;
 	return pte; 
 }
  
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