| Message ID | 20190116085035.29729-5-aneesh.kumar@linux.ibm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | NestMMU pte upgrade workaround for mprotect | expand |
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com> writes: > Architectures like ppc64 require to do a conditional tlb flush based on the old > and new value of pte. Follow the regular pte change protection sequence for > hugetlb too. This allows the architectures to override the update sequence. > > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> > --- > include/linux/hugetlb.h | 20 ++++++++++++++++++++ > mm/hugetlb.c | 8 +++++--- > 2 files changed, 25 insertions(+), 3 deletions(-) > > diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h > index 087fd5f48c91..39e78b80375c 100644 > --- a/include/linux/hugetlb.h > +++ b/include/linux/hugetlb.h > @@ -543,6 +543,26 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr > set_huge_pte_at(mm, addr, ptep, pte); > } > #endif > + > +#ifndef huge_ptep_modify_prot_start > +#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start > +static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, > + unsigned long addr, pte_t *ptep) > +{ > + return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); > +} > +#endif > + > +#ifndef huge_ptep_modify_prot_commit > +#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit > +static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, > + unsigned long addr, pte_t *ptep, > + pte_t old_pte, pte_t pte) > +{ > + set_huge_pte_at(vma->vm_mm, addr, ptep, pte); > +} > +#endif > + > #else /* CONFIG_HUGETLB_PAGE */ > struct hstate {}; > #define alloc_huge_page(v, a, r) NULL > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index df2e7dd5ff17..f824d2200ca9 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -4387,10 +4387,12 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, > continue; > } > if (!huge_pte_none(pte)) { > - pte = huge_ptep_get_and_clear(mm, address, ptep); > - pte = pte_mkhuge(huge_pte_modify(pte, newprot)); > + pte_t old_pte; > + > + old_pte = huge_ptep_modify_prot_start(vma, address, ptep); > + pte = pte_mkhuge(huge_pte_modify(old_pte, newprot)); > pte = arch_make_huge_pte(pte, vma, NULL, 0); > - set_huge_pte_at(mm, address, ptep, pte); > + huge_ptep_modify_prot_commit(vma, address, ptep, old_pte, pte); > pages++; > } > spin_unlock(ptl); Looks like a faithful conversion. Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> cheers
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index 087fd5f48c91..39e78b80375c 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -543,6 +543,26 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr set_huge_pte_at(mm, addr, ptep, pte); } #endif + +#ifndef huge_ptep_modify_prot_start +#define huge_ptep_modify_prot_start huge_ptep_modify_prot_start +static inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep) +{ + return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); +} +#endif + +#ifndef huge_ptep_modify_prot_commit +#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commit +static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, + unsigned long addr, pte_t *ptep, + pte_t old_pte, pte_t pte) +{ + set_huge_pte_at(vma->vm_mm, addr, ptep, pte); +} +#endif + #else /* CONFIG_HUGETLB_PAGE */ struct hstate {}; #define alloc_huge_page(v, a, r) NULL diff --git a/mm/hugetlb.c b/mm/hugetlb.c index df2e7dd5ff17..f824d2200ca9 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -4387,10 +4387,12 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma, continue; } if (!huge_pte_none(pte)) { - pte = huge_ptep_get_and_clear(mm, address, ptep); - pte = pte_mkhuge(huge_pte_modify(pte, newprot)); + pte_t old_pte; + + old_pte = huge_ptep_modify_prot_start(vma, address, ptep); + pte = pte_mkhuge(huge_pte_modify(old_pte, newprot)); pte = arch_make_huge_pte(pte, vma, NULL, 0); - set_huge_pte_at(mm, address, ptep, pte); + huge_ptep_modify_prot_commit(vma, address, ptep, old_pte, pte); pages++; } spin_unlock(ptl);
Architectures like ppc64 require to do a conditional tlb flush based on the old and new value of pte. Follow the regular pte change protection sequence for hugetlb too. This allows the architectures to override the update sequence. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> --- include/linux/hugetlb.h | 20 ++++++++++++++++++++ mm/hugetlb.c | 8 +++++--- 2 files changed, 25 insertions(+), 3 deletions(-)