From: Suresh Siddha <suresh.b.siddha@intel.com>
To: mingo@elte.hu, hpa@zytor.com, tglx@linutronix.de, arjan@linux.intel.com
Cc: linux-kernel@vger.kernel.org, Suresh Siddha <suresh.b.siddha@intel.com>
Subject: [patch 2/7] x86, cpa: remove USER permission from the very early identity mapping attribute
Date: Thu, 11 Sep 2008 13:30:50 -0700 [thread overview]
Message-ID: <20080911204150.578029000@linux-os.sc.intel.com> (raw)
In-Reply-To: 20080911203048.929515000@linux-os.sc.intel.com
[-- Attachment #1: change_init_pte_mapping.patch --]
[-- Type: text/plain, Size: 1050 bytes --]
remove USER from the PTE/PDE attributes for the very early identity
mapping. We overwrite these mappings with KERNEL attribute later
in the boot. Just being paranoid here as there is no need for USER bit
to be set.
If this breaks something(don't know the history), then we can simply drop
this change.
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
---
Index: tip/include/asm-x86/pgtable.h
===================================================================
--- tip.orig/include/asm-x86/pgtable.h 2008-09-11 11:15:53.000000000 -0700
+++ tip/include/asm-x86/pgtable.h 2008-09-11 11:16:04.000000000 -0700
@@ -138,8 +138,8 @@
#ifdef CONFIG_X86_64
#define __PAGE_KERNEL_IDENT_LARGE_EXEC __PAGE_KERNEL_LARGE_EXEC
#else
-#define PTE_IDENT_ATTR 0x007 /* PRESENT+RW+USER */
-#define PDE_IDENT_ATTR 0x067 /* PRESENT+RW+USER+DIRTY+ACCESSED */
+#define PTE_IDENT_ATTR 0x003 /* PRESENT+RW */
+#define PDE_IDENT_ATTR 0x063 /* PRESENT+RW+DIRTY+ACCESSED */
#define PGD_IDENT_ATTR 0x001 /* PRESENT (no other attributes) */
#endif
--
next prev parent reply other threads:[~2008-09-11 21:19 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-11 20:30 [patch 0/7] x86, cpa: cpa related changes to be inline with TLB Application note Suresh Siddha
2008-09-11 20:30 ` [patch 1/7] x86, cpa: rename PTE attribute macros for kernel direct mapping in early boot Suresh Siddha
2008-09-11 20:30 ` Suresh Siddha [this message]
2008-09-11 20:30 ` [patch 3/7] x86, cpa: make the kernel physical mapping initialization a two pass sequence Suresh Siddha
2008-09-11 20:30 ` [patch 4/7] x86, cpa: dont use large pages for kernel identity mapping with DEBUG_PAGEALLOC Suresh Siddha
2008-09-11 20:30 ` [patch 5/7] x86, cpa: fix taking the pgd_lock with interrupts off Suresh Siddha
2008-09-11 20:30 ` [patch 6/7] x86, cpa: remove cpa pool code Suresh Siddha
2008-09-11 20:30 ` [patch 7/7] x86, cpa: global flush tlb after splitting large page and before doing cpa Suresh Siddha
2008-09-13 17:10 ` Jeremy Fitzhardinge
2008-09-14 15:29 ` [patch 0/7] x86, cpa: cpa related changes to be inline with TLB Application note Ingo Molnar
2008-09-14 16:59 ` Ingo Molnar
2008-09-16 5:44 ` Suresh Siddha
2008-09-14 15:40 ` Arjan van de Ven
2008-09-14 15:52 ` Ingo Molnar
-- strict thread matches above, loose matches on Subject: below --
2008-09-23 21:00 [patch 0/7] x86, cpa: cpa related changes to be inline with TLB Application note - v2 Suresh Siddha
2008-09-23 21:00 ` [patch 2/7] x86, cpa: remove USER permission from the very early identity mapping attribute Suresh Siddha
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