ptep_set_access_flags and ptep_set_wrprotect are doing direct pte
updates ignoring the paravirt interface.
The wrprotect change is especially important since it allows full
batching of fork() on COW mappings.
There are still a few PTE update interfaces bypassing paravirt, such as
ptep_get_and_clear_full and ptep_get_and_clear.
Signed-off-by: Marcelo Tosatti <[EMAIL PROTECTED]>
Index: linux-2.6-x86-kvm/include/asm-x86/paravirt.h
===================================================================
--- linux-2.6-x86-kvm.orig/include/asm-x86/paravirt.h
+++ linux-2.6-x86-kvm/include/asm-x86/paravirt.h
@@ -1004,6 +1004,13 @@ static inline void set_pte(pte_t *ptep,
pte.pte);
}
+static inline void pte_clear_bit(unsigned int bit, pte_t *ptep)
+{
+ pte_t pte = *ptep;
+ clear_bit(bit, (unsigned long *)&pte.pte);
+ set_pte(ptep, pte);
+}
+
static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
pte_t *ptep, pte_t pte)
{
Index: linux-2.6-x86-kvm/include/asm-x86/pgtable.h
===================================================================
--- linux-2.6-x86-kvm.orig/include/asm-x86/pgtable.h
+++ linux-2.6-x86-kvm/include/asm-x86/pgtable.h
@@ -227,6 +227,8 @@ void native_pagetable_setup_done(pgd_t *
#define pte_update(mm, addr, ptep) do { } while (0)
#define pte_update_defer(mm, addr, ptep) do { } while (0)
+#define pte_clear_bit(bit, ptep) clear_bit(bit, (unsigned long
*)&ptep->pte)
+
static inline void paravirt_pagetable_setup_start(pgd_t *base)
{
native_pagetable_setup_start(base);
@@ -302,7 +304,7 @@ static inline void native_set_pte_at(str
({ \
int __changed = !pte_same(*(ptep), entry); \
if (__changed && dirty) { \
- *ptep = entry; \
+ set_pte(ptep, entry); \
pte_update_defer((vma)->vm_mm, (address), (ptep)); \
flush_tlb_page(vma, address); \
} \
@@ -357,7 +359,7 @@ static inline pte_t ptep_get_and_clear_f
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long
addr, pte_t *ptep)
{
- clear_bit(_PAGE_BIT_RW, (unsigned long *)&ptep->pte);
+ pte_clear_bit(_PAGE_BIT_RW, ptep);
pte_update(mm, addr, ptep);
}
--
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