41bb3476b3
Andy reported that if file page get reclaimed we lose the soft-dirty bit if it was there, so save _PAGE_BIT_SOFT_DIRTY bit when page address get encoded into pte entry. Thus when #pf happens on such non-present pte we can restore it back. Reported-by: Andy Lutomirski <luto@amacapital.net> Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: Pavel Emelyanov <xemul@parallels.com> Cc: Matt Mackall <mpm@selenic.com> Cc: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Peter Zijlstra <peterz@infradead.org> Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Cc: Minchan Kim <minchan@kernel.org> Cc: Wanpeng Li <liwanp@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
158 lines
4.9 KiB
C
158 lines
4.9 KiB
C
#ifndef _ASM_X86_PGTABLE_2LEVEL_H
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#define _ASM_X86_PGTABLE_2LEVEL_H
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#define pte_ERROR(e) \
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pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low)
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#define pgd_ERROR(e) \
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pr_err("%s:%d: bad pgd %08lx\n", __FILE__, __LINE__, pgd_val(e))
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/*
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* Certain architectures need to do special things when PTEs
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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static inline void native_set_pte(pte_t *ptep , pte_t pte)
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{
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*ptep = pte;
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}
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static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
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{
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*pmdp = pmd;
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}
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static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
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{
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native_set_pte(ptep, pte);
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}
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static inline void native_pmd_clear(pmd_t *pmdp)
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{
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native_set_pmd(pmdp, __pmd(0));
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}
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static inline void native_pte_clear(struct mm_struct *mm,
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unsigned long addr, pte_t *xp)
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{
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*xp = native_make_pte(0);
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}
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#ifdef CONFIG_SMP
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static inline pte_t native_ptep_get_and_clear(pte_t *xp)
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{
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return __pte(xchg(&xp->pte_low, 0));
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}
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#else
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#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
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#endif
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#ifdef CONFIG_SMP
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static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp)
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{
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return __pmd(xchg((pmdval_t *)xp, 0));
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}
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#else
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#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp)
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#endif
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#ifdef CONFIG_MEM_SOFT_DIRTY
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/*
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* Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE, _PAGE_BIT_SOFT_DIRTY and
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* _PAGE_BIT_PROTNONE are taken, split up the 28 bits of offset
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* into this range.
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*/
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#define PTE_FILE_MAX_BITS 28
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#define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
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#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
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#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
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#define PTE_FILE_SHIFT4 (_PAGE_BIT_SOFT_DIRTY + 1)
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#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
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#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
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#define PTE_FILE_BITS3 (PTE_FILE_SHIFT4 - PTE_FILE_SHIFT3 - 1)
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#define pte_to_pgoff(pte) \
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((((pte).pte_low >> (PTE_FILE_SHIFT1)) \
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& ((1U << PTE_FILE_BITS1) - 1))) \
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+ ((((pte).pte_low >> (PTE_FILE_SHIFT2)) \
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& ((1U << PTE_FILE_BITS2) - 1)) \
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<< (PTE_FILE_BITS1)) \
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+ ((((pte).pte_low >> (PTE_FILE_SHIFT3)) \
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& ((1U << PTE_FILE_BITS3) - 1)) \
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<< (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \
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+ ((((pte).pte_low >> (PTE_FILE_SHIFT4))) \
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<< (PTE_FILE_BITS1 + PTE_FILE_BITS2 + PTE_FILE_BITS3))
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#define pgoff_to_pte(off) \
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((pte_t) { .pte_low = \
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((((off)) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \
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+ ((((off) >> PTE_FILE_BITS1) \
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& ((1U << PTE_FILE_BITS2) - 1)) \
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<< PTE_FILE_SHIFT2) \
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+ ((((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \
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& ((1U << PTE_FILE_BITS3) - 1)) \
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<< PTE_FILE_SHIFT3) \
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+ ((((off) >> \
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(PTE_FILE_BITS1 + PTE_FILE_BITS2 + PTE_FILE_BITS3))) \
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<< PTE_FILE_SHIFT4) \
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+ _PAGE_FILE })
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#else /* CONFIG_MEM_SOFT_DIRTY */
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/*
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* Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken,
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* split up the 29 bits of offset into this range.
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*/
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#define PTE_FILE_MAX_BITS 29
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#define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1)
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#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
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#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
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#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
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#else
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#define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1)
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#define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1)
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#endif
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#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
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#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
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#define pte_to_pgoff(pte) \
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((((pte).pte_low >> PTE_FILE_SHIFT1) \
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& ((1U << PTE_FILE_BITS1) - 1)) \
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+ ((((pte).pte_low >> PTE_FILE_SHIFT2) \
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& ((1U << PTE_FILE_BITS2) - 1)) << PTE_FILE_BITS1) \
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+ (((pte).pte_low >> PTE_FILE_SHIFT3) \
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<< (PTE_FILE_BITS1 + PTE_FILE_BITS2)))
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#define pgoff_to_pte(off) \
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((pte_t) { .pte_low = \
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(((off) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \
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+ ((((off) >> PTE_FILE_BITS1) & ((1U << PTE_FILE_BITS2) - 1)) \
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<< PTE_FILE_SHIFT2) \
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+ (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \
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<< PTE_FILE_SHIFT3) \
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+ _PAGE_FILE })
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#endif /* CONFIG_MEM_SOFT_DIRTY */
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/* Encode and de-code a swap entry */
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#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
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#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
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#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
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#else
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#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
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#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
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#endif
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#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
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#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \
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& ((1U << SWP_TYPE_BITS) - 1))
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#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT)
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#define __swp_entry(type, offset) ((swp_entry_t) { \
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((type) << (_PAGE_BIT_PRESENT + 1)) \
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| ((offset) << SWP_OFFSET_SHIFT) })
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#define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low })
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#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
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#endif /* _ASM_X86_PGTABLE_2LEVEL_H */
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