[PATCH V5 0/5] NestMMU pte upgrade workaround for mprotect

[Aneesh Kumar K.V]

Andrew,

How do you want to merge this? Michael Ellerman suggests this should go
via -mm tree.

-aneesh


"Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> writes:

> We can upgrade pte access (R -> RW transition) via mprotect. We need
> to make sure we follow the recommended pte update sequence as outlined in
> commit bd5050e38aec ("powerpc/mm/radix: Change pte relax sequence to handle nest MMU hang")
> for such updates. This patch series do that.
>
> Changes from V4:
> * Drop EXPORT_SYMBOL 
>
> Changes from V3:
> * Build fix for x86
>
> Changes from V2:
> * Update commit message for patch 4
> * use radix tlb flush routines directly.
>
> Changes from V1:
> * Restrict ths only for R->RW upgrade. We don't need to do this for Autonuma
> * Restrict this only for radix translation mode.
>
>
> Aneesh Kumar K.V (5):
>   mm: Update ptep_modify_prot_start/commit to take vm_area_struct as arg
>   mm: update ptep_modify_prot_commit to take old pte value as arg
>   arch/powerpc/mm: Nest MMU workaround for mprotect RW upgrade.
>   mm/hugetlb: Add prot_modify_start/commit sequence for hugetlb update
>   arch/powerpc/mm/hugetlb: NestMMU workaround for hugetlb mprotect RW
>     upgrade
>
>  arch/powerpc/include/asm/book3s/64/hugetlb.h | 12 ++++++++++
>  arch/powerpc/include/asm/book3s/64/pgtable.h | 18 ++++++++++++++
>  arch/powerpc/include/asm/book3s/64/radix.h   |  4 ++++
>  arch/powerpc/mm/hugetlbpage-hash64.c         | 25 ++++++++++++++++++++
>  arch/powerpc/mm/hugetlbpage-radix.c          | 17 +++++++++++++
>  arch/powerpc/mm/pgtable-book3s64.c           | 25 ++++++++++++++++++++
>  arch/powerpc/mm/pgtable-radix.c              | 18 ++++++++++++++
>  arch/s390/include/asm/pgtable.h              |  5 ++--
>  arch/s390/mm/pgtable.c                       |  8 ++++---
>  arch/x86/include/asm/paravirt.h              | 13 +++++-----
>  arch/x86/include/asm/paravirt_types.h        |  5 ++--
>  arch/x86/xen/mmu.h                           |  4 ++--
>  arch/x86/xen/mmu_pv.c                        |  8 +++----
>  fs/proc/task_mmu.c                           |  8 ++++---
>  include/asm-generic/pgtable.h                | 18 +++++++-------
>  include/linux/hugetlb.h                      | 20 ++++++++++++++++
>  mm/hugetlb.c                                 |  8 ++++---
>  mm/memory.c                                  |  8 +++----
>  mm/mprotect.c                                |  6 ++---
>  19 files changed, 189 insertions(+), 41 deletions(-)
>
> -- 
> 2.20.1