linux-kernel - Re: [PATCHv3 3/8] mm: Pass down mm_struct to untagged

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Date:   Fri, 10 Jun 2022 23:33:00 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "kirill.shutemov@...ux.intel.com" <kirill.shutemov@...ux.intel.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Lutomirski, Andy" <luto@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "hjl.tools@...il.com" <hjl.tools@...il.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "kcc@...gle.com" <kcc@...gle.com>,
        "andreyknvl@...il.com" <andreyknvl@...il.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>,
        "dvyukov@...gle.com" <dvyukov@...gle.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "ryabinin.a.a@...il.com" <ryabinin.a.a@...il.com>,
        "glider@...gle.com" <glider@...gle.com>
Subject: Re: [PATCHv3 3/8] mm: Pass down mm_struct to untagged_addr()

On Fri, 2022-06-10 at 17:35 +0300, Kirill A. Shutemov wrote:
> Intel Linear Address Masking (LAM) brings per-mm untagging rules.
> Pass
> down mm_struct to the untagging helper. It will help to apply
> untagging
> policy correctly.
> 
> In most cases, current->mm is the one to use, but there are some
> exceptions, such as get_user_page_remote().
> 
> Move dummy implementation of untagged_addr() from <linux/mm.h> to
> <linux/uaccess.h>. <asm/uaccess.h> can override the implementation.
> Moving the dummy header outside <linux/mm.h> helps to avoid header
> hell
> if you need to defer mm_struct within the helper.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> ---
>  arch/arm64/include/asm/memory.h                  |  4 ++--
>  arch/arm64/include/asm/signal.h                  |  2 +-
>  arch/arm64/include/asm/uaccess.h                 |  4 ++--
>  arch/arm64/kernel/hw_breakpoint.c                |  2 +-
>  arch/arm64/kernel/traps.c                        |  4 ++--
>  arch/arm64/mm/fault.c                            | 10 +++++-----
>  arch/sparc/include/asm/pgtable_64.h              |  2 +-
>  arch/sparc/include/asm/uaccess_64.h              |  2 ++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c |  2 +-
>  drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c          |  2 +-
>  drivers/gpu/drm/radeon/radeon_gem.c              |  2 +-
>  drivers/infiniband/hw/mlx4/mr.c                  |  2 +-
>  drivers/media/common/videobuf2/frame_vector.c    |  2 +-
>  drivers/media/v4l2-core/videobuf-dma-contig.c    |  2 +-
>  drivers/staging/media/atomisp/pci/hmm/hmm_bo.c   |  2 +-
>  drivers/tee/tee_shm.c                            |  2 +-
>  drivers/vfio/vfio_iommu_type1.c                  |  2 +-
>  fs/proc/task_mmu.c                               |  2 +-
>  include/linux/mm.h                               | 11 -----------
>  include/linux/uaccess.h                          | 11 +++++++++++
>  lib/strncpy_from_user.c                          |  2 +-
>  lib/strnlen_user.c                               |  2 +-
>  mm/gup.c                                         |  6 +++---
>  mm/madvise.c                                     |  2 +-
>  mm/mempolicy.c                                   |  6 +++---
>  mm/migrate.c                                     |  2 +-
>  mm/mincore.c                                     |  2 +-
>  mm/mlock.c                                       |  4 ++--
>  mm/mmap.c                                        |  2 +-
>  mm/mprotect.c                                    |  2 +-
>  mm/mremap.c                                      |  2 +-
>  mm/msync.c                                       |  2 +-
>  virt/kvm/kvm_main.c                              |  2 +-
>  33 files changed, 55 insertions(+), 53 deletions(-)

Reviewed-by: Rick Edgecombe <rick.p.edgecombe@...el.com>