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authorIngo Molnar <mingo@elte.hu>2008-03-19 20:30:40 +0100
committerIngo Molnar <mingo@elte.hu>2008-04-24 23:57:30 +0200
commit1ec1fe73dfb711f9ea5a0ef8a7e3af5b6ac8b653 (patch)
tree8bd9c69ef81e161feae599580bbab84b58f11761 /arch/x86/mm
parent4f76cd382213b29dd3658e3e1ea47c0c2be06f3c (diff)
x86: xen unify x86 add common mm pgtable c fix
Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/pgtable.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index d526b46ae188..ed16b7704a3c 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -200,6 +200,24 @@ static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)
return 1;
}
+
+void pud_populate(struct mm_struct *mm, pud_t *pudp, pmd_t *pmd)
+{
+ paravirt_alloc_pd(mm, __pa(pmd) >> PAGE_SHIFT);
+
+ /* Note: almost everything apart from _PAGE_PRESENT is
+ reserved at the pmd (PDPT) level. */
+ set_pud(pudp, __pud(__pa(pmd) | _PAGE_PRESENT));
+
+ /*
+ * According to Intel App note "TLBs, Paging-Structure Caches,
+ * and Their Invalidation", April 2007, document 317080-001,
+ * section 8.1: in PAE mode we explicitly have to flush the
+ * TLB via cr3 if the top-level pgd is changed...
+ */
+ if (mm == current->active_mm)
+ write_cr3(read_cr3());
+}
#else /* !CONFIG_X86_PAE */
/* No need to prepopulate any pagetable entries in non-PAE modes. */
static int pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd)