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From: "bibo,mao" <bibo.mao@intel.com>
To: ak@suse.de
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] x86_64 add NX mask for PTE entry
Date: Wed, 18 Oct 2006 17:15:16 +0800	[thread overview]
Message-ID: <4535F0A4.1090709@intel.com> (raw)

Hi,
    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@intel.com>

diff --git a/include/asm-x86_64/pgtable.h b/include/asm-x86_64/pgtable.h
index 6899e77..0555c1c 100644
--- a/include/asm-x86_64/pgtable.h
+++ b/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;
  }

             reply	other threads:[~2006-10-18  9:15 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-10-18  9:15 bibo,mao [this message]
2006-10-18 10:58 ` [PATCH] x86_64 add NX mask for PTE entry Andi Kleen
2006-10-18 11:23   ` bibo,mao
2006-10-18 11:45     ` bibo,mao
2006-10-18 13:15       ` Andi Kleen
2006-10-19  1:35   ` bibo,mao

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