[PATCH] i386: PARAVIRT: Add pagetable accessors to pack and unpack pagetable entries

Add a set of accessors to pack, unpack and modify page table entries
(at all levels).  This allows a paravirt implementation to control the
contents of pgd/pmd/pte entries.  For example, Xen uses this to
convert the (pseudo-)physical address into a machine address when
populating a pagetable entry, and converting back to pphys address
when an entry is read.

Signed-off-by: Jeremy Fitzhardinge <jeremy@xensource.com>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 12 insertions, 72 deletions

diff --git a/arch/i386/kernel/paravirt.c b/arch/i386/kernel/paravirt.c
index 3fdbd1f62379..cba7a15ce1b0 100644
--- a/arch/i386/kernel/paravirt.c
+++ b/arch/i386/kernel/paravirt.c
@@ -117,78 +117,6 @@ static void native_flush_tlb_single(u32 addr)
         __native_flush_tlb_single(addr);
 }
 
-#ifndef CONFIG_X86_PAE
-static void native_set_pte(pte_t *ptep, pte_t pteval)
-{
-        *ptep = pteval;
-}
-
-static void native_set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pteval)
-{
-        *ptep = pteval;
-}
-
-static void native_set_pmd(pmd_t *pmdp, pmd_t pmdval)
-{
-        *pmdp = pmdval;
-}
-
-#else /* CONFIG_X86_PAE */
-
-static void native_set_pte(pte_t *ptep, pte_t pte)
-{
-        ptep->pte_high = pte.pte_high;
-        smp_wmb();
-        ptep->pte_low = pte.pte_low;
-}
-
-static void native_set_pte_at(struct mm_struct *mm, u32 addr, pte_t *ptep, pte_t pte)
-{
-        ptep->pte_high = pte.pte_high;
-        smp_wmb();
-        ptep->pte_low = pte.pte_low;
-}
-
-static void native_set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
-{
-        ptep->pte_low = 0;
-        smp_wmb();
-        ptep->pte_high = pte.pte_high;
-        smp_wmb();
-        ptep->pte_low = pte.pte_low;
-}
-
-static void native_set_pte_atomic(pte_t *ptep, pte_t pteval)
-{
-        set_64bit((unsigned long long *)ptep,pte_val(pteval));
-}
-
-static void native_set_pmd(pmd_t *pmdp, pmd_t pmdval)
-{
-        set_64bit((unsigned long long *)pmdp,pmd_val(pmdval));
-}
-
-static void native_set_pud(pud_t *pudp, pud_t pudval)
-{
-        *pudp = pudval;
-}
-
-static void native_pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
-{
-        ptep->pte_low = 0;
-        smp_wmb();
-        ptep->pte_high = 0;
-}
-
-static void native_pmd_clear(pmd_t *pmd)
-{
-        u32 *tmp = (u32 *)pmd;
-        *tmp = 0;
-        smp_wmb();
-        *(tmp + 1) = 0;
-}
-#endif /* CONFIG_X86_PAE */
-
 /* These are in entry.S */
 extern void native_iret(void);
 extern void native_irq_enable_sysexit(void);
@@ -282,14 +210,26 @@ struct paravirt_ops paravirt_ops = {
         .set_pmd = native_set_pmd,
         .pte_update = paravirt_nop,
         .pte_update_defer = paravirt_nop,
+
+        .ptep_get_and_clear = native_ptep_get_and_clear,
+
 #ifdef CONFIG_X86_PAE
         .set_pte_atomic = native_set_pte_atomic,
         .set_pte_present = native_set_pte_present,
         .set_pud = native_set_pud,
         .pte_clear = native_pte_clear,
         .pmd_clear = native_pmd_clear,
+
+        .pmd_val = native_pmd_val,
+        .make_pmd = native_make_pmd,
 #endif
 
+        .pte_val = native_pte_val,
+        .pgd_val = native_pgd_val,
+
+        .make_pte = native_make_pte,
+        .make_pgd = native_make_pgd,
+
         .irq_enable_sysexit = native_irq_enable_sysexit,
         .iret = native_iret,