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authorJeremy Fitzhardinge <jeremy@goop.org>2009-02-04 18:33:38 -0800
committerH. Peter Anvin <hpa@zytor.com>2009-02-04 21:33:09 -0800
commitb534816b552d35bbd3c60702139ed5c7da2f55c2 (patch)
tree1e48095368b05b498264105757e6d79e78dace62 /arch/x86
parent4560839939f4b4a96e21e80584f87308ac93c1da (diff)
x86: don't apply __supported_pte_mask to non-present ptes
On an x86 system which doesn't support global mappings, __supported_pte_mask has _PAGE_GLOBAL clear, to make sure it never appears in the PTE. pfn_pte() and so on will enforce it with: static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot) { return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) | pgprot_val(pgprot)) & __supported_pte_mask); } However, we overload _PAGE_GLOBAL with _PAGE_PROTNONE on non-present ptes to distinguish them from swap entries. However, applying __supported_pte_mask indiscriminately will clear the bit and corrupt the pte. I guess the best fix is to only apply __supported_pte_mask to present ptes. This seems like the right solution to me, as it means we can completely ignore the issue of overlaps between the present pte bits and the non-present pte-as-swap entry use of the bits. __supported_pte_mask contains the set of flags we support on the current hardware. We also use bits in the pte for things like logically present ptes with no permissions, and swap entries for swapped out pages. We should only apply __supported_pte_mask to present ptes, because otherwise we may destroy other information being stored in the ptes. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/pgtable.h26
-rw-r--r--arch/x86/include/asm/xen/page.h2
2 files changed, 21 insertions, 7 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 06bbcbd66e9..4f5af8447d5 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -302,16 +302,30 @@ static inline pte_t pte_mkspecial(pte_t pte)
extern pteval_t __supported_pte_mask;
+/*
+ * Mask out unsupported bits in a present pgprot. Non-present pgprots
+ * can use those bits for other purposes, so leave them be.
+ */
+static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
+{
+ pgprotval_t protval = pgprot_val(pgprot);
+
+ if (protval & _PAGE_PRESENT)
+ protval &= __supported_pte_mask;
+
+ return protval;
+}
+
static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
- return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
- pgprot_val(pgprot)) & __supported_pte_mask);
+ return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
+ massage_pgprot(pgprot));
}
static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
{
- return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
- pgprot_val(pgprot)) & __supported_pte_mask);
+ return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
+ massage_pgprot(pgprot));
}
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
@@ -323,7 +337,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
* the newprot (if present):
*/
val &= _PAGE_CHG_MASK;
- val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
+ val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
return __pte(val);
}
@@ -339,7 +353,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
-#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
+#define canon_pgprot(p) __pgprot(massage_pgprot(p))
static inline int is_new_memtype_allowed(unsigned long flags,
unsigned long new_flags)
diff --git a/arch/x86/include/asm/xen/page.h b/arch/x86/include/asm/xen/page.h
index 7ef617ef1df..4bd990ee43d 100644
--- a/arch/x86/include/asm/xen/page.h
+++ b/arch/x86/include/asm/xen/page.h
@@ -137,7 +137,7 @@ static inline pte_t mfn_pte(unsigned long page_nr, pgprot_t pgprot)
pte_t pte;
pte.pte = ((phys_addr_t)page_nr << PAGE_SHIFT) |
- (pgprot_val(pgprot) & __supported_pte_mask);
+ massage_pgprot(pgprot);
return pte;
}